EP3815845B1 - Tensioning device for tensioning a workpiece - Google Patents

Description

• wobei die Spannschraube ein Gewinde aufweist und der Spannarm einen Eingriffsabschnitt aufweist, der in einem Arbeitszustand der Spannvorrichtung in Eingriff mit dem Gewinde der Spannschraube steht, und
• wobei die Spannvorrichtung ferner ein Befestigungsmittel zur Befestigung der Spannvorrichtung an einem Untergrund und eine Befestigungsmittel-Aufnahme umfasst.

The present invention relates to a clamping device for clamping a workpiece, the clamping device comprising a housing, a clamping arm pivotally held on the housing and a clamping screw which is rotatably mounted about a longitudinal axis of the clamping screw,

• wherein the clamping screw has a thread and the clamping arm has an engagement section which is in engagement with the thread of the clamping screw in a working state of the clamping device, and
• wherein the tensioning device further comprises a fastening means for fastening the tensioning device to a surface and a fastening means receptacle.

The DE 85 15 633 U1 discloses a tensioning device according to the preamble of claim 1 and according to the preamble of claim 2.

The present invention is based on the object of creating a clamping device of the type mentioned above, in which attachment of the clamping device to a surface can be carried out particularly simply and easily.

This object is achieved by a clamping device according to claim 1 and by a clamping device according to claim 2.

The fastener is arranged in the fastener receptacle of the clamping device when the actuating tool engages the fastener and extends through the recess of the clamping arm or laterally past the bent region of the clamping arm to the fastener.

In a preferred embodiment of the invention according to claim 2 it is provided that the clamping arm can be pivoted relative to the housing between a first working position and a second working position and the offset is designed such that the actuating tool is in both the first working position and the second Working position can extend laterally past the bent area of the clamping arm up to the fastening means.

In the second working position, the clamping arm is pivoted relative to the housing of the clamping device by an angle of preferably at least 30°, in particular at least 40°, particularly preferably at least 60°, relative to the first working position.

It is particularly advantageous if the offset is designed in such a way that the actuating tool can extend laterally past the offset area of the clamping arm relative to the housing to the fastening means in any position of the clamping arm lying between the first working position and the second working position.

The at least two recesses can in particular be designed as a passage opening in the clamping arm.

Such a passage opening preferably extends through the clamping arm from an upper side of the clamping arm facing away from the fastener receptacle to an underside of the clamping arm facing the fastener receptacle.

The recess can in particular be designed as an elongated hole in order to enable the actuating tool to extend in a variety of working positions through the recess designed as an elongated hole to the fastening means.

In the design of the clamping device according to the invention according to claim 1, it is provided that the clamping arm has at least a first recess and a second recess and can be pivoted relative to the housing between a first working position and a second working position, the first recess being designed such that Actuating tool can extend in the first working position through the first recess to the fastening means and the second recess is designed such that the actuating tool can extend in the second working position through the second recess to the fastening means.

Furthermore, it can be provided that the clamping arm has more than two recesses through which the actuating tool can extend to the fastening means when the clamping arm is in different working positions.

At least two of the recesses in the clamping arm can be designed so that they open into a common mouth opening on the underside of the clamping arm facing the fastener receptacle.

In order to be able to set a desired working position of the clamping arm relative to the housing of the clamping device as accurately as possible, it is advantageous if the clamping device comprises at least one working position scale, which is arranged on the housing or on a component of the clamping device connected in a rotationally fixed manner to the housing, and one Index marking, which is arranged on the clamping arm or on a component of the clamping device connected in a rotationally fixed manner to the clamping arm, with a predetermined positioning of the index marking relative to the working position scale being assigned to several working positions of the clamping arm relative to the housing.

In particular, it can be provided that the working position scale includes a plurality of working position markings, to which different working positions of the clamping arm are assigned relative to the housing.

In a special embodiment of the invention it is provided that the clamping arm is provided with a pressure piece and the heights H of the pressure piece in relation to a support surface of the housing of the clamping device, which the pressure piece assumes in the various working positions to which the working position markings are assigned, form an essentially equidistant sequence.

One of the working position markings of the working position scale can be an upper end position marking, which is assigned to the working position in which the height H _o of the pressure piece is maximum in relation to the support surface of the housing.

Furthermore, one of the working position markings can be a lower end position marking, which is assigned to the working position in which the height H _u of the pressure piece is minimal in relation to the support surface of the housing.

Preferably, at least one working position scale is provided on two different sides of the housing of the clamping device, so that the positioning of the clamping arm relative to the housing of the clamping device can be easily read from two opposite sides of the clamping device.

In a special embodiment of the clamping device according to the invention, it is provided that at least one of the working position scales is arranged on an outer edge of the housing.

Alternatively or in addition to this, it can be provided that at least one of the working position scales is arranged on an inner edge of the housing, which lies opposite an edge of a bearing section of the clamping arm.

With the bearing section, the clamping arm is preferably mounted on a boundary wall of the housing of the clamping device so that it can pivot about a pivot axis of the clamping arm.

The clamping arm is preferably provided with a pressure piece, which comprises a pressure piece base body and a pressure piece insert releasably connected to the pressure piece base body.

The pressure piece base body is preferably held captively on the clamping arm.

The pressure piece insert is preferably connected to the pressure piece base body so that it can be exchanged for another pressure piece insert.

In a special embodiment of a pressure piece insert, the pressure piece insert can have a substantially flat clamping surface with which the pressure piece can be placed on a workpiece to be clamped.

In a special embodiment of a pressure piece insert, the pressure piece insert can comprise a clamping surface which is provided with one or more grooves in order to produce a corrugation or profiling of the clamping surface.

In a special embodiment of a pressure piece insert, it can be provided that the pressure piece insert has a recess with which the workpiece can come into engagement when the workpiece is clamped.

Such a recess can extend, for example, in a longitudinal direction or in a transverse direction of the clamping device.

The recess can have a cross section - taken perpendicular to its longitudinal direction - which is preferably triangular or trapezoidal.

In a special embodiment of the clamping device it is provided that the pressure piece insert is detachably connected to the pressure piece base body by means of a magnetic element.

The magnetic element preferably comprises a permanent magnet.

The magnetic element can be arranged on the pressure piece base body or on the pressure piece insert.

The pressure piece base body is preferably provided with a projection, the underside of which, which faces away from a pressure piece pivot axis of the clamping device, can serve as a clamping surface for a workpiece to be clamped by means of the clamping device if no pressure piece insert is arranged on the pressure piece base body.

The pressure piece insert can have a recess into which the projection of the pressure piece base body engages when the pressure piece insert is arranged on the pressure piece base body.

The recess is preferably designed to be complementary to the projection, so that the projection and the recess together form a positive connection, through which a displacement of the pressure piece insert relative to the pressure piece base body in a direction parallel to the underside of the pressure piece base body is prevented.

The tensioning device according to the invention is particularly suitable for use in a combination of a tensioning device according to the invention and an actuating tool for actuating a fastening means for attaching the tensioning device to a surface.

The actuation tool can have a substantially rectilinear tool section which extends from the recess or from the bent region of the clamping arm to the fastening means when the actuation tool is used to actuate the fastening means.

In particular, it can be provided that the actuating tool is designed as an Allen key.

In this case, the fastening means preferably comprises a hexagon socket screw.

In order to be able to move the clamping arm as quickly as possible from a first working position relative to the housing of the clamping device into a second working position relative to the housing of the clamping device, it can be provided that the clamping device comprises a decoupling device, by means of which the thread of the clamping screw can be brought out of engagement with the engagement section of the clamping arm, so that the clamping arm can be pivoted relative to the housing of the clamping device between a first working position and a second working position, regardless of a rotation of the clamping screw.

Such a decoupling device can in particular comprise a guide element which receives a guide section of the clamping screw and is movable, in particular displaceable, between an engagement position in which the clamping screw is in engagement with the clamping arm and a release position in which the clamping screw is out of engagement with the clamping arm , is.

The decoupling device can in particular comprise a biasing device which biases the guide element into the engaged position.

Alternatively or in addition to this, the decoupling device can comprise a latching device, by means of which the guide element can be latched in the engaged position and/or in the release position - preferably on the housing of the clamping device.

The latching device can comprise at least one latching part that is between a latching position in which the latching part locks the guide element in the engagement position and/or in the release position, and an unlocking position in which the latching part allows a movement of the guide element from the engagement position into the release position and/or or releases from the release position into the engaged position, is movable.

In particular, the latching device can comprise a spring element which biases the at least one latching part into the latching position.

In a special embodiment of the latching device it is provided that the latching device comprises two latching parts which protrude from the housing of the clamping device in opposite directions.

The latching part or at least one of the latching parts can be provided with an actuating element on which an operator can act in order to move the latching part into the unlocking position.

The latching part or at least one of the latching parts is preferably guided displaceably in a guide channel of the guide element.

The clamping screw preferably comprises an actuating end part on which a screwing tool can engage in order to rotate the clamping screw about its longitudinal axis.

The actuating end part can in particular be designed as a clamping screw head.

The actuating end part can have a polygonal cross section, in particular a hexagonal cross section, taken perpendicular to the longitudinal axis of the clamping screw.

Furthermore, it can be provided that the actuating end part is provided with a recess with a polygonal cross section, in particular with a hexagonal cross section.

The clamping screw can have a bearing end part, by means of which the clamping screw is pivotally mounted relative to the housing - preferably on the housing.

The bearing end part can have a sectionally spherical bearing section which is arranged on a sectionally complementary bearing receptacle of the housing of the clamping device.

The tensioning arm is preferably pivotable relative to the housing of the tensioning device through an angle of at least 30°, in particular of at least 45°, particularly preferably of at least 60°, when the thread of the tensioning screw is out of engagement with the engagement portion of the tensioning arm.

The clamping device can comprise at least one chip protection element which at least partially covers a gap between two opposing inner walls of the housing of the clamping device.

In particular, the clamping device can comprise an upper chip protection element, which is arranged on a side of the clamping arm facing away from the support surface of the clamping device, and/or a lower chip protection element, which is arranged on a side of the clamping arm facing the support surface of the clamping device.

In order to prevent chips or other contaminants from getting between a chip protection element and the clamping arm into an interior of the housing of the clamping device, it is advantageous if at least one chip protection element has an edge section that rests on the clamping arm or is separated from the clamping arm by less than 2 mm, in particular by less than 1 mm, is spaced apart.

Further features and advantages of the invention are the subject of the following description and the graphic representation of exemplary embodiments.

Fig. 1

eine perspektivische Darstellung einer erfindungsgemäßen ersten Ausführungsform einer Spannvorrichtung zum Einspannen eines Werkstücks, welche ein Gehäuse, einen schwenkbar an dem Gehäuse gehaltenen Spannarm und eine Spannschraube umfasst, wobei der Spannarm sich in einer oberen Endstellung befindet;

Fig. 2

eine Seitenansicht der Spannvorrichtung aus Fig. 1;

Fig. 3

eine Draufsicht auf die Spannvorrichtung aus den Fig. 1 und 2, mit der Blickrichtung in Richtung des Pfeiles 3 in Fig. 2;

Fig. 4

eine Draufsicht auf die Spannvorrichtung aus den Fig. 1 bis 3 von unten, mit der Blickrichtung in Richtung des Pfeiles 4 in Fig. 2;

Fig. 5

eine Vorderansicht der Spannvorrichtung aus den Fig. 1 bis 4, mit der Blickrichtung in Richtung des Pfeiles 5 in Fig. 2;

Fig. 6

eine Ansicht der Spannvorrichtung aus den Fig. 1 bis 5 von hinten, mit der Blickrichtung in Richtung des Pfeiles 6 in Fig. 2;

Fig. 7

einen Längsschnitt durch die Spannvorrichtung aus den Fig. 1 bis 6, längs der Linie 7 - 7 in Fig. 3, wobei der Spannarm sich in seiner oberen Endstellung befindet und ein Eingriffsabschnitt des Spannarms in Eingriff mit einem Gewinde der Spannschraube steht;

Fig. 8

einen Längsschnitt durch die Spannvorrichtung aus den Fig. 1 bis 7, längs der Linie 8 - 8 in Fig. 2, wobei ein Führungselement einer Entkopplungsvorrichtung der Spannvorrichtung sich in einer Eingriffstellung befindet, in welcher die Spannschraube in Eingriff mit dem Spannarm steht, und Verrastungsteile einer Rastvorrichtung der Entkopplungsvorrichtung sich in einer Raststellung befinden, in welcher die Verrastungsteile das Führungselement in der Eingriffstellung arretieren;

Fig. 9

einen der Fig. 8 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei das Führungselement sich in der Eingriffstellung befindet und die Verrastungsteile in eine Entrastungsstellung bewegt worden sind, in welcher die Verrastungsteile eine Bewegung des Führungselements von der Eingriffstellung in eine Freigabestellung, in welcher die Spannschraube außer Eingriff mit dem Spannarm ist, freigeben;

Fig. 10

einen den Fig. 8 und 9 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei das Führungselement von der Eingriffstellung in die Freigabestellung bewegt worden ist und wobei die Verrastungsteile sich in der Entrastungsstellung befinden, in welcher die Verrastungsteile eine Bewegung des Führungselements von der Freigabestellung in die Eingriffstellung freigeben;

Fig. 11

eine Draufsicht von oben auf die Spannvorrichtung aus den Fig. 1 bis 10, wobei der Spannarm sich in seiner oberen Endstellung befindet, das Führungselement sich in der Freigabestellung befindet und die Verrastungsteile sich in der Entrastungsstellung befinden;

Fig. 12

einen Querschnitt durch die Spannvorrichtung im Bereich der Rastvorrichtung, längs der Linie 12 - 12 in Fig. 11, wobei die Verrastungsteile der Rastvorrichtung sich in der Entrastungsstellung befinden, in welcher die Verrastungsteile eine Bewegung des Führungselements von der Freigabestellung in die Eingriffstellung freigeben;

Fig. 13

einen der Fig. 12 entsprechenden Querschnitt durch die Spannvorrichtung, wobei die Verrastungsteile von der Entrastungsstellung in die Raststellung bewegt worden sind, in welcher die Verrastungsteile das Führungselement in der Freigabestellung arretieren;

Fig. 14

einen den Fig. 8 bis 10 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei das Führungselement sich in der Freigabestellung befindet und die Verrastungsteile sich in der Raststellung befinden;

Fig. 15

einen der Fig. 7 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei der Spannarm sich in seiner oberen Endstellung befindet, das Führungselement sich in der Freigabestellung befindet und das Gewinde der Spannschraube außer Eingriff mit dem Eingriffsabschnitt des Spannarms ist;

Fig. 16

einen der Fig. 15 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei der Spannarm in seine untere Endstellung bewegt worden ist und das Führungselement sich in der Eingriffstellung befindet, so dass das Gewinde der Spannschraube in Eingriff mit dem Eingriffsabschnitt des Spannarms steht;

Fig. 17

eine perspektivische Darstellung der Spannvorrichtung aus den Fig. 1 bis 16, eines Befestigungsmittels und eines Betätigungswerkzeugs zum Betätigen des Befestigungsmittels, welches sich seitlich an einem abgekröpften Bereichs des Spannarms vorbei bis zu dem Befestigungsmittel erstreckt, wobei der Spannarm sich in seiner oberen Endstellung befindet;

Fig. 18

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 17;

Fig. 19

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 17 und 18;

Fig. 20

eine perspektivische Darstellung der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus den Fig. 17 bis 19, wobei der Spannarm sich in seiner unteren Endstellung befindet;

Fig. 21

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 20;

Fig. 22

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 20 und 21;

Fig. 23

eine perspektivische Darstellung einer erfindungsgemäßen zweiten Ausführungsform einer Spannvorrichtung zum Einspannen eines Werkstücks, welche ein Gehäuse, einen schwenkbar an dem Gehäuse gehaltenen Spannarm und eine Spannschraube umfasst, wobei der Spannarm mit einer Abkröpfung versehen ist und wobei verschiedene Druckstück-Einsätze dargestellt sind, welche mit einem Druckstück-Grundkörper an einem freien Ende des Spannarms verbindbar sind;

Fig. 24

eine Seitenansicht der Spannvorrichtung und der Druckstück-Einsätze aus Fig. 23;

Fig. 25

einen Längsschnitt durch die Spannvorrichtung und die Druckstück-Einsätze aus Fig. 24;

Fig. 26

eine Draufsicht von oben auf die Spannvorrichtung aus den Fig. 23 bis 25, mit der Blickrichtung in Richtung des Pfeiles 26 in Fig. 24;

Fig. 27

eine Draufsicht von unten auf die Spannvorrichtung aus den Fig. 23 bis 26, mit der Blickrichtung in Richtung des Pfeiles 27 in Fig. 24;

Fig. 28

eine Vorderansicht der Spannvorrichtung und der Druckstück-Einsätze aus den Fig. 23 bis 27, mit der Blickrichtung in Richtung des Pfeiles 28 in Fig. 24;

Fig. 29

eine Ansicht der Spannvorrichtung aus den Fig. 23 bis 28 von hinten, mit der Blickrichtung in Richtung des Pfeiles 29 in Fig. 24;

Fig. 30

eine perspektivische Darstellung der Spannvorrichtung aus den Fig. 23 bis 29, eines Befestigungsmittels und eines Betätigungswerkzeugs zum Betätigen des Befestigungsmittels, wobei der Spannarm sich in seiner oberen Endstellung befindet und das Betätigungswerkzeug sich seitlich an dem abgekröpften Bereich des Spannarms vorbei bis zu dem Befestigungsmittel erstreckt;

Fig. 31

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 30;

Fig. 32

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 30 und 31;

Fig. 33

eine perspektivische Darstellung der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus den Fig. 30 bis 32, wobei der Spannarm sich in einer unteren Endstellung befindet und das Betätigungswerkzeug sich seitlich an dem abgekröpften Bereich des Spannarms vorbei bis zu dem Befestigungsmittel erstreckt;

Fig. 34

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 33;

Fig. 35

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 33 und 34;

Fig. 36

eine perspektivische Darstellung einer nicht erfindungsgemäßen dritten Ausführungsform einer Spannvorrichtung zum Einspannen eines Werkstücks, welche ein Gehäuse, einen schwenkbar an dem Gehäuse gehaltenen Spannarm und eine Spannschraube umfasst, wobei der Spannarm eine Ausnehmung aufweist und sich in seiner oberen Endstellung befindet und wobei mehrere Druckstück-Einsätze dargestellt sind, die mit einem Druckstück-Grundkörper an einem freien Ende des Spannarms verbindbar sind;

Fig. 37

eine Seitenansicht der Spannvorrichtung und der Druckstück-Einsätze aus Fig. 36;

Fig. 38

einen Längsschnitt durch die Spannvorrichtung und die Druckstück-Einsätze aus den Fig. 36 und 37;

Fig. 39

eine Draufsicht von oben auf die Spannvorrichtung aus den Fig. 36 bis 38, mit der Blickrichtung in Richtung des Pfeiles 39 in Fig. 37;

Fig. 40

eine perspektivische Darstellung der Spannvorrichtung aus den Fig. 36 bis 39, eines Befestigungsmittels und eines Betätigungswerkzeugs zum Betätigen des Befestigungsmittels, wobei der Spannarm sich in seiner oberen Endstellung befindet und das Betätigungswerkzeug sich durch die Ausnehmung des Spannarms hindurch bis zu dem Befestigungsmittel erstreckt;

Fig. 41

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 40;

Fig. 42

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 40 und 41;

Fig. 43

eine perspektivische Darstellung der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus den Fig. 40 bis 42, wobei der Spannarm sich in seiner unteren Endstellung befindet und das Betätigungswerkzeug sich durch die Ausnehmung des Spannarms hindurch bis zu dem Befestigungsmittel erstreckt;

Fig. 44

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 43;

Fig. 45

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 43 und 44;

Fig. 46

eine perspektivische Darstellung einer erfindungsgemäßen vierten Ausführungsform einer Spannvorrichtung zum Einspannen eines Werkstücks, welche ein Gehäuse, einen schwenkbar an dem Gehäuse gehaltenen Spannarm und eine Spannschraube umfasst, wobei der Spannarm eine erste Ausnehmung und eine zweite Ausnehmung umfasst und sich in seiner oberen Endstellung befindet und wobei mehrere Druckstück-Einsätze dargestellt sind, welche mit einem Druckstück-Grundkörper an einem freien Ende des Spannarms verbindbar sind;

Fig. 47

eine Seitenansicht der Spannvorrichtung und der Druckstück-Einsätze aus Fig. 46;

Fig. 48

einen Längsschnitt durch die Spannvorrichtung und die Druckstück-Einsätze aus den Fig. 46 und 47;

Fig. 49

eine Draufsicht auf die Spannvorrichtung aus den Fig. 46 bis 48, mit der Blickrichtung in Richtung des Pfeiles 49 in Fig. 47;

Fig. 50

eine perspektivische Darstellung der Spannvorrichtung aus den Fig. 46 bis 49, eines Befestigungsmittels und eines Betätigungswerkzeugs zum Betätigen des Befestigungsmittels, wobei der Spannarm sich in seiner oberen Endstellung befindet und das Betätigungswerkzeug sich durch die erste Ausnehmung des Spannarms hindurch bis zu dem Befestigungsmittel erstreckt;

Fig. 51

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 50;

Fig. 52

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 50 und 51;

Fig. 53

eine perspektivische Darstellung der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus den Fig. 50 bis 52, wobei der Spannarm sich in seiner unteren Endstellung befindet und das Betätigungswerkzeug sich durch die zweite Ausnehmung des Spannarms hindurch bis zu dem Befestigungsmittel erstreckt;

Fig. 54

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 53;

Fig. 55

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 53 und 54;

Fig. 56

eine perspektivische Darstellung des freien Endbereichs des Spannarms, eines Druckstück-Grundkörpers und mehrerer austauschbarer Druckstück-Einsätze bei einer Variante der Spannvorrichtung;

Fig. 57

eine Seitenansicht des freien Endbereichs des Spannarms, des Druckstück-Grundkörpers und der Druckstück-Einsätze aus Fig. 56, mit der Blickrichtung in Richtung einer Druckstück-Schwenkachse der Spannvorrichtung;

Fig. 58

einen Längsschnitt durch den freien Endbereich des Spannarms, den Druckstück-Grundkörper und die Druckstück-Einsätze aus Fig. 57;

Fig. 59

eine Vorderansicht des freien Endbereichs des Spannarms, des Druckstück-Grundkörpers und der Druckstück-Einsätze aus den Fig. 56 bis 58, mit der Blickrichtung senkrecht zu der Druckstück-Schwenkachse und parallel zur Längsrichtung der Spannvorrichtung; und

Fig. 60

einen Querschnitt durch den freien Endbereich des Spannarms, den Druckstück-Grundkörper und die Druckstück-Einsätze aus Fig. 59.

Shown in the drawings:

Fig. 1

a perspective view of a first embodiment of a clamping device according to the invention for clamping a workpiece, which comprises a housing, a clamping arm pivotally held on the housing and a clamping screw, the clamping arm being in an upper end position;

Fig. 2

a side view of the clamping device Fig. 1 ;

Fig. 3

a top view of the clamping device from the Fig. 1 and 2 , facing in the direction of the arrow 3 in Fig. 2 ;

Fig. 4

a top view of the clamping device from the Fig. 1 to 3 from below, looking in the direction of the arrow 4 in Fig. 2 ;

Fig. 5

a front view of the tensioning device from the Fig. 1 to 4 , facing in the direction of the arrow 5 in Fig. 2 ;

Fig. 6

a view of the clamping device from the Fig. 1 to 5 from behind, looking in the direction of the arrow 6 in Fig. 2 ;

Fig. 7

a longitudinal section through the clamping device Fig. 1 to 6 , along the line 7 - 7 in Fig. 3 , wherein the clamping arm is in its upper end position and an engaging portion of the clamping arm is in engagement with a thread of the clamping screw;

Fig. 8

a longitudinal section through the clamping device Fig. 1 to 7 , along the line 8 - 8 in Fig. 2 , wherein a guide element of a decoupling device of the tensioning device is in an engagement position in which the tensioning screw engages stands on the tension arm, and latching parts of a latching device of the decoupling device are in a latching position, in which the latching parts lock the guide element in the engaged position;

Fig. 9

one of the Fig. 8 corresponding longitudinal section through the clamping device, the guide element being in the engaged position and the latching parts having been moved into an unlocking position in which the latching parts allow a movement of the guide element from the engaged position into a release position in which the clamping screw is out of engagement with the clamping arm, release;

Fig. 10

one the Fig. 8 and 9 corresponding longitudinal section through the tensioning device, wherein the guide element has been moved from the engagement position into the release position and wherein the latching parts are in the unlocking position, in which the latching parts enable movement of the guide element from the release position into the engagement position;

Fig. 11

a top view of the clamping device from the Fig. 1 to 10 , whereby the clamping arm is in its upper end position, the guide element is in the release position and the locking parts are in the unlocking position;

Fig. 12

a cross section through the tensioning device in the area of the locking device, along the line 12 - 12 in Fig. 11 , wherein the latching parts of the latching device are in the unlocking position, in which the latching parts enable movement of the guide element from the release position into the engaged position;

Fig. 13

one of the Fig. 12 corresponding cross section through the clamping device, the latching parts having been moved from the unlocking position into the latching position, in which the latching parts lock the guide element in the release position;

Fig. 14

one the Fig. 8 to 10 corresponding longitudinal section through the tensioning device, the guide element being in the release position and the latching parts being in the latching position;

Fig. 15

one of the Fig. 7 corresponding longitudinal section through the clamping device, the clamping arm being in its upper end position, the guide element being in the release position and the thread of the clamping screw being disengaged from the engagement portion of the clamping arm;

Fig. 16

one of the Fig. 15 corresponding longitudinal section through the tensioning device, wherein the tensioning arm has been moved to its lower end position and the guide element is in the engaged position, so that the thread of the tensioning screw is in engagement with the engagement portion of the tensioning arm;

Fig. 17

a perspective view of the clamping device from the Fig. 1 to 16 , a fastening means and an actuating tool for actuating the fastening means, which extends laterally past a bent region of the tensioning arm up to the fastening means, the tensioning arm being in its upper end position;

Fig. 18

a side view of the tensioning device, the fastening means and the operating tool Fig. 17 ;

Fig. 19

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 17 and 18 ;

Fig. 20

a perspective view of the clamping device, the fastening means and the actuating tool from the Fig. 17 to 19 , with the clamping arm in its lower end position;

Fig. 21

a side view of the tensioning device, the fastening means and the operating tool Fig. 20 ;

Fig. 22

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 20 and 21 ;

Fig. 23

a perspective view of a second embodiment of a clamping device according to the invention for clamping a workpiece, which comprises a housing, a clamping arm pivotally held on the housing and a clamping screw, the clamping arm being provided with an offset and various pressure piece inserts being shown, which are provided with a Pressure piece base body can be connected to a free end of the clamping arm;

Fig. 24

a side view of the clamping device and the pressure piece inserts Fig. 23 ;

Fig. 25

a longitudinal section through the clamping device and the pressure piece inserts Fig. 24 ;

Fig. 26

a top view of the clamping device from the Fig. 23 to 25 , facing in the direction of the arrow 26 in Fig. 24 ;

Fig. 27

a top view from below of the clamping device from the Fig. 23 to 26 , facing in the direction of the arrow 27 in Fig. 24 ;

Fig. 28

a front view of the clamping device and the pressure piece inserts from the Fig. 23 to 27 , facing in the direction of the arrow 28 in Fig. 24 ;

Fig. 29

a view of the clamping device from the Fig. 23 to 28 from behind, looking in the direction of the arrow 29 in Fig. 24 ;

Fig. 30

a perspective view of the clamping device from the Fig. 23 to 29 , a fastening means and an actuating tool for actuating the fastening means, the tensioning arm being in its upper end position and the actuation tool extending laterally past the bent region of the tensioning arm to the fastening means;

Fig. 31

a side view of the tensioning device, the fastening means and the operating tool Fig. 30 ;

Fig. 32

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 30 and 31 ;

Fig. 33

a perspective view of the clamping device, the fastening means and the actuating tool from the Fig. 30 to 32 , with the clamping arm in a lower end position is located and the actuating tool extends laterally past the bent area of the clamping arm to the fastening means;

Fig. 34

a side view of the tensioning device, the fastening means and the operating tool Fig. 33 ;

Fig. 35

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 33 and 34 ;

Fig. 36

a perspective view of a third embodiment of a clamping device not according to the invention for clamping a workpiece, which comprises a housing, a clamping arm pivotally held on the housing and a clamping screw, the clamping arm having a recess and being in its upper end position and several pressure piece inserts are shown, which can be connected to a pressure piece base body at a free end of the clamping arm;

Fig. 37

a side view of the clamping device and the pressure piece inserts Fig. 36 ;

Fig. 38

a longitudinal section through the clamping device and the pressure piece inserts from the Fig. 36 and 37 ;

Fig. 39

a top view of the clamping device from the Fig. 36 to 38 , facing in the direction of the arrow 39 in Fig. 37 ;

Fig. 40

a perspective view of the clamping device from the Fig. 36 to 39 , a fastening means and an actuating tool for actuating the fastening means, the tensioning arm being in its upper end position and the actuation tool extending through the recess in the tensioning arm to the fastening means;

Fig. 41

a side view of the tensioning device, the fastening means and the operating tool Fig. 40 ;

Fig. 42

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 40 and 41 ;

Fig. 43

a perspective view of the clamping device, the fastening means and the actuating tool from the Fig. 40 to 42 , wherein the clamping arm is in its lower end position and the actuating tool extends through the recess in the clamping arm to the fastening means;

Fig. 44

a side view of the tensioning device, the fastening means and the operating tool Fig. 43 ;

Fig. 45

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 43 and 44 ;

Fig. 46

a perspective view of a fourth embodiment of a clamping device according to the invention for clamping a workpiece, which comprises a housing, a clamping arm pivotally held on the housing and a clamping screw, the clamping arm having a first recess and a second recess comprises and is in its upper end position and wherein several pressure piece inserts are shown, which can be connected to a pressure piece base body at a free end of the clamping arm;

Fig. 47

a side view of the clamping device and the pressure piece inserts Fig. 46 ;

Fig. 48

a longitudinal section through the clamping device and the pressure piece inserts from the Fig. 46 and 47 ;

Fig. 49

a top view of the clamping device from the Fig. 46 to 48 , facing in the direction of the arrow 49 in Fig. 47 ;

Fig. 50

a perspective view of the clamping device from the Fig. 46 to 49 , a fastening means and an actuating tool for actuating the fastening means, the tensioning arm being in its upper end position and the actuation tool extending through the first recess of the tensioning arm to the fastening means;

Fig. 51

a side view of the tensioning device, the fastening means and the operating tool Fig. 50 ;

Fig. 52

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 50 and 51 ;

Fig. 53

a perspective view of the clamping device, the fastening means and the actuating tool from the Fig. 50 to 52 , whereby the clamping arm is in its lower end position and the actuating tool is through the second Recess of the clamping arm extends through to the fastening means;

Fig. 54

a side view of the tensioning device, the fastening means and the operating tool Fig. 53 ;

Fig. 55

a longitudinal section through the clamping device, the fastening means and the actuating tool from the Fig. 53 and 54 ;

Fig. 56

a perspective view of the free end region of the clamping arm, a pressure piece base body and several replaceable pressure piece inserts in a variant of the clamping device;

Fig. 57

a side view of the free end area of the clamping arm, the pressure piece base body and the pressure piece inserts Fig. 56 , looking in the direction of a pressure piece pivot axis of the clamping device;

Fig. 58

a longitudinal section through the free end region of the clamping arm, the pressure piece base body and the pressure piece inserts Fig. 57 ;

Fig. 59

a front view of the free end region of the clamping arm, the pressure piece base body and the pressure piece inserts from the Fig. 56 to 58 , with the viewing direction perpendicular to the pressure piece pivot axis and parallel to the longitudinal direction of the clamping device; and

Fig. 60

a cross section through the free end region of the clamping arm, the pressure piece base body and the pressure piece inserts Fig. 59 .

Identical or functionally equivalent elements are designated with the same reference numerals in all figures.

One in the Fig. 1 to 22 The clamping device 100 shown is used to clamp a workpiece 102 on a clamping surface 104, which can be designed, for example, coplanar with a support surface 106 of a housing 108 of the clamping device 100, but also offset up or down relative to this support surface 106 and / or inclined relative to the support surface 106 can be.

How best from the Fig. 3 , 4 and 6 As can be seen, the housing 108 is preferably designed in two parts and comprises a first housing part 110a and a second housing part 110b, which preferably rest against one another in a contact plane 112, which is parallel to a longitudinal direction 114 of the clamping device 100 and perpendicular to a transverse direction 116 of the clamping device 100 is aligned.

The longitudinal direction 114 and/or the transverse direction 116 are preferably aligned parallel to the support surface 106 of the housing 108.

A height direction 118 of the clamping device 100 is aligned perpendicular to the longitudinal direction 114 and perpendicular to the transverse direction 116 and thus also perpendicular to the support surface 106 of the housing 108 of the clamping device 100.

The two housing parts 110a and 110b are secured to one another - preferably releasably - by means of one or more, for example three, fastening elements 120.

The fastening elements 120 can, for example, each be designed as a screw, which passes through a passage opening in one housing part, for example in the second housing part 110b, and with its thread (not shown) into a complementary internal thread on the other housing part, for example on the first Housing part 110a is screwed in.

As best seen from the top view of the underside of the jig 100 in Fig. 4 As can be seen, the housing 108 is provided on its front edge 122 with a - for example essentially U-shaped - fastener receptacle 124, which serves to receive a fastener for fastening the clamping device 100 to a surface 126.

Such a fastening means 128 can, for example, include a fastening screw 130 and a T-slot piece 132, the fastening screw 130 being screwed with its external thread into a complementary internal thread of the T-slot piece 132 (see the Fig. 17 to 22 ).

The base 126, to which the clamping device can be attached by means of the fastening means 128, can be designed, for example, as a machine table, as a workpiece pallet or as a base element, onto which the clamping device 100 is placed in order to raise the support surface 106 by the height of the base element Clamping surface 104 to be spaced apart.

As best seen in the sectional view of Fig. 7 As can be seen, the clamping device 100 further comprises a clamping arm 136 which is pivotally held on the housing 108 about a pivot axis 134.

The pivot axis 134 of the clamping arm 136 is aligned parallel to the transverse direction 116 of the clamping device 100.

The clamping arm 136 comprises a clamping section 138, which extends through an outlet opening 140 bordered by the housing parts 110a and 110b on the front of the housing 108 into an outer space 142 of the housing 108.

At a free end region 144 of the clamping arm 136 facing away from the pivot axis 134, a pressure piece 146 is arranged, which serves to transmit a clamping force from the clamping device to the workpiece 102 to be clamped.

The pressure piece 146 is preferably pivotally articulated on the tension arm 136 about a pressure piece pivot axis 148 relative to the free end region 144 of the clamping arm 136.

The pressure piece 146 can be formed in one piece.

Alternatively, the pressure piece 146 preferably comprises a pressure piece base body 150, which is connected to the clamping arm 136, and a pressure piece insert 152 which is detachably connected to the pressure piece base body 150 (see Fig. 1 ).

The pressure piece insert 152 is preferably connected to the pressure piece base body 150 by positive locking.

In particular, it can be provided that the pressure piece insert 152 is detachably secured to the pressure piece base body 150 by means of a tongue-and-groove connection.

Due to the detachable connection between the pressure piece insert 152 and the pressure piece base body 150, it is possible to replace the pressure piece insert 152 with a differently designed further pressure piece insert 152 ', as described below in the description in the Fig. 23 until 35 illustrated second embodiment of a clamping device 100 will be explained in more detail.

Alternatively or in addition to a detachable connection between the pressure piece insert 152 and the pressure piece base body 150 by means of a tongue-and-groove connection, it can be provided that the pressure piece insert 152 'is releasably connected to the pressure piece base body 150 by means of a magnetic element 310 .

Such a variant of the pressure piece 146 is in the Fig. 56 to 60 shown.

In this embodiment, the pressure piece base body 150 preferably has a projection 312 on its underside facing away from the pressure piece pivot axis 148, the underside 314 of which can serve as a clamping surface 290 for clamping a workpiece 102 by means of the clamping device 100 when there is no pressure piece insert 152 'on the pressure piece base body 150 is arranged.

The clamping surface 290 can be essentially flat and rest against the workpiece 102 when the clamping device 100 is used to clamp a workpiece 102.

The pressure piece insert 152 'preferably has a recess 316 into which the projection 312 of the pressure piece base body 150 engages when the pressure piece insert 152' is arranged on the pressure piece base body 150.

The recess 316 is preferably designed to be complementary to the projection 312, so that the pressure piece insert 152 'is secured against displacement relative to the pressure piece base body 150 in directions parallel to the underside 314 of the projection 312 when the pressure piece insert 152 'is arranged on the pressure piece base body 150.

The magnetic element 310, which creates a non-positive connection between the pressure piece insert 152 'and the pressure piece base body 150, is arranged on the pressure piece insert 152' in the embodiment shown in the drawing.

In principle, it could also be provided that the magnetic element 310 is arranged on the pressure piece base body 150; In this case, it is not necessary to provide the pressure piece inserts 152 'with a magnetic element 310.

The first pressure piece insert 152b 'is provided with one or more grooves 292 on the clamping surface 290 facing away from the pressure piece base body 150 in the assembled state of the pressure piece insert 152b', through which the clamping surface 290 is profiled, so that the pressure piece insert 152b 'can dig into the workpiece 102 to be clamped with its clamping surface 290 in order to increase the adhesion between the pressure piece 146 and the workpiece 102 to be clamped.

The grooves 292, as shown in the drawing, can run parallel to the transverse direction 116 of the clamping device 100 (and thus parallel to the pressure piece pivot axis 148) or run parallel to the longitudinal direction 114 of the clamping device 100 or run in any other direction.

In the case of the second pressure piece insert 152c', a recess 294 is provided on the clamping surface 290 facing away from the pressure piece base body 150 in the assembled state of the pressure piece insert 152c', which recess extends in the transverse direction 116 of the clamping device 100 and preferably has a trapezoidal shape perpendicular thereto has a triangular cross section.

In the third pressure piece insert 152d', the pressure piece insert 152d' faces away from the pressure piece base body 150 in the assembled state Clamping surface 290 is provided with a recess 294 ', which extends parallel to the longitudinal direction 114 of the clamping device 100 and preferably has a trapezoidal or triangular cross section perpendicular to this direction.

Through the recess 294 or 294 'of the second pressure piece insert 152c' or the fourth pressure piece insert 152d', a particularly good force transmission from the pressure piece 146 to a workpiece 102 can be achieved, which is at least partially complementary to the respective recess 294 or 294'. has trained workpiece section.

Incidentally, that is correct Fig. 56 to 60 illustrated variant of the first embodiment of a clamping device in terms of structure, method of manufacture and function with that in the Fig. 1 to 22 The basic version of the first embodiment shown corresponds, to the above and following descriptions reference is made in this respect.

As best seen from the side view of the jig 100 in Fig. 2 As can be seen, the clamping device 100 includes a working position scale 154, which is arranged on the housing 108 of the clamping device 100, and an index marking 156 which interacts with the working position scale 154 and which is arranged on the clamping arm 136.

The index mark 156 preferably extends in a direction directed radially to the pivot axis 134 of the clamping arm 136.

The index marking 156 can be designed, for example, as a depression or as an elevation on the clamping arm 136.

Alternatively, it can be provided that the index marking 156 stands out from the area of the clamping arm 136 surrounding it due to its color and/or its brightness.

The working position scale 154 preferably includes a plurality of working position markings 158, which are assigned to different working positions of the clamping arm 136 relative to the housing 108 of the clamping device 100, the clamping arm 136 being rotated in these different working positions by different angles relative to the housing 108 about the pivot axis 134.

At the in Fig. 2 In the illustrated embodiment, the working position scale 154 includes, for example, five such working position markings 158; Alternatively, it can also be provided that the working position scale 154 only includes one, two, three, four or more than five working position markings 158.

The working position markings 158 preferably extend in a direction directed radially to the pivot axis 134.

The working position markings 158 can in particular be designed as elevations or recesses on the housing 108.

Alternatively or in addition to this, it is possible for the working position markings 158 to stand out from the area of the housing 108 adjacent to the working position markings 158 due to their color and/or their brightness.

At the in the Fig. 1 to 22 In the illustrated embodiment of a clamping device 100, two working position scales 154 are provided, one of the working position scales 154 being arranged on the first housing part 110a and a second working position scale 154 being arranged on the second housing part 110b. Accordingly, two index markings 156 are also provided on the clamping arm 136, with a first index marking 156a being arranged on the side of the clamping arm 136 facing the first working position scale 154a and the second index marking being arranged on the side of the clamping arm 136 facing the second working position scale 154.

Because there is a working position scale 154 on each side of the clamping arm 136, which interacts with an index marking 156 of the clamping arm 136, the respective working position of the clamping arm 136 can be read easily and reliably from both sides of the clamping device 100.

Preferably, one of the working position markings 158 of the working position scale 154 is an upper end position marking 160a, which is assigned to the working position of the clamping arm 136, in which the height H _o of the pressure piece pivot axis 148 with respect to the support surface 106 of the housing 108 of the clamping device 100 is maximum.

In Fig. 7 the clamping arm 136 is in this upper end position.

Furthermore, one of the working position markings 158 of the working position scale 154 is preferably a lower end position marking 160b, which is assigned to the working position of the clamping arm 136, in which the height H _u of the pressure piece pivot axis 148 with respect to the support surface 106 of the housing 108 is minimal.

In Fig. 16 the clamping arm 136 is in this lower end position.

The intermediate position markings 162a, 162b and 162c of the working position scale 154 lying between the upper end position marking 160a and the lower end position marking 160b are preferably so on

Housing 108 arranged so that the heights H ₁ , H ₂ , H ₃ and H _u of the pressure piece pivot axis 148 with respect to the support surface 106 of the housing 108 of the clamping device 100, which the pressure piece pivot axis 148 in the various intermediate positions of the clamping arm 136, to which the intermediate position markings 162a, 162b and 162c are assigned, or respectively in the lower end position of the clamping arm 136, which is assigned to the lower end position marking 160b, each occupies, form a substantially equidistant sequence.

The intermediate position markings 162a, 162b and 162c are therefore preferably arranged relative to the upper end position marking 160a and the lower end position marking 160b such that the height H ₁ , which the pressure piece pivot axis 148 occupies in the first intermediate position assigned to the first intermediate position marking 162a, is ΔH lower is the height H _o which the pressure piece pivot axis 148 occupies in the upper end position of the clamping arm 136.

Furthermore, the height H ₂ , which the pressure piece pivot axis 148 occupies in the second intermediate position assigned to the second intermediate position marking 162b, is smaller by ΔH than the height H ₁ .

The height H ₃ , which the pressure piece pivot axis 148 occupies in the third intermediate position assigned to the third intermediate position marking 162c, is smaller by ΔH than the height H ₂ .

The height H _u , which the pressure piece pivot axis 148 occupies in the lower end position, is smaller by ΔH than the height H ₃ .

In the exemplary embodiment shown, in which three intermediate position markings 162a, 162b and 162c are provided, $$\Delta \mathrm{H}=\left({\mathrm{H}}_{\mathrm{O}}-{\mathrm{H}}_{\mathrm{u}}\right)/4.$$

If the working position scale 154 includes n intermediate position markings 162, the following generally applies: ΔH = (H _o - H _u ) / (n + 1).

The angle of rotation with respect to the pivot axis 134 of the clamping arm 136, by which the positions of immediately successive working position markings 158 of the working position scale 154 differ from one another, is therefore not constant, but decreases from the upper end position marking 160a to the lower end position marking 160b.

At the in the Fig. 1 to 22 In the first embodiment of a clamping device 100 shown, the working position scale 154 is arranged on an outer edge 164 of the housing 108 of the clamping device, and the working position markings 158 are each designed as recesses, in particular as notches, on the relevant outer edge 164.

An alternative design of a work position scale 154 is discussed below in connection with that in the Fig. 23 to 35 illustrated second embodiment of a clamping device 100 will be described.

In order to be able to pivot the clamping arm 136 about the pivot axis 134 into the desired working position, which does not have to correspond to the upper end position or the lower end position or one of the intermediate positions described above, each of which is assigned to a working position marking 158, but can lie between these positions , the clamping device 100 includes a movement device designated as a whole by 166, which includes a clamping screw 168 which is rotatably mounted about a longitudinal axis 170 of the clamping screw 168 (see Fig. 7 ).

The clamping screw 168 has a thread 172 which is in the in Fig. 7 working condition shown and in the in Fig. 16 illustrated working state of the clamping device 100 in engagement with a gear ring segment 174 stands, which is formed on an engagement section 176 of the clamping arm 136.

The engagement section 176 of the clamping arm 136 is arranged on the side of the pivot axis 134 of the clamping arm 136 facing away from the free end region 144 of the clamping arm 136.

The clamping screw 168 further comprises a bearing end part 178, by means of which the clamping screw 168 is pivotally mounted relative to the housing 108.

The bearing end part 178 is releasably secured to an end region 184 of a shaft 186 of the clamping screw 168 by means of a fastening screw 182.

The thread 172 of the clamping screw 168 is formed on the shaft 186 of the clamping screw 168.

An annular stop 187 is arranged between the thread 172 and the bearing end part 178, which prevents the clamping screw 168 from moving downward along its longitudinal axis 170 when it is not in engagement with the engagement portion 176 of the clamping arm 136.

The bearing end part 178 comprises a bearing section 180, which has an outer contour that is partially spherical.

The partially spherical bearing section 180 of the clamping screw 168 is arranged in a partially complementary bearing receptacle 188 of the housing 108 of the clamping device 100, so that the clamping screw 168 is located along the partially spherical contact surface between the bearing section 180 of the bearing end part 178 on the one hand and the bearing receptacle 188 on the other hand from the in Fig. 7 The working position shown in Fig. 15 Release position shown can be pivoted.

In the working position, the longitudinal axis 170 of the clamping screw 168 is preferably aligned essentially perpendicular to the support surface 106 of the housing 108 of the clamping device 100.

At the end of the clamping screw 168 facing away from the bearing end part 178, an actuating end part 190 is formed, on which an operator can attack by hand or using a tool in order to rotate the clamping screw 168 about its longitudinal axis 170 and thereby move the clamping arm 136 into the desired working position move.

The actuating end part 190 can in particular be designed as a clamping screw head.

The actuating end part 190 preferably has a polygonal cross section - taken perpendicular to the longitudinal axis 170 of the clamping screw 168 - for example a hexagonal cross section.

A guide section 192 of the clamping screw 168 lying between the actuating end part 190 and the thread 172 of the clamping screw 168 passes through a guide opening 194 in a guide element 196 of the clamping device 100.

The guide element 196 is slidably guided on the housing 108 of the clamping device 100 so that it can be moved from one to the other Fig. 7 and 15 illustrated engagement position, in which the clamping screw 168 is in engagement with the clamping arm 136, into an in Fig. 15 Release position shown, in which the clamping screw 168 is out of engagement with the clamping arm 136, and can be moved from the release position back into the engaged position.

The tensioning device 100 further comprises a pretensioning device 198, which pushes the guide element 196 into the Fig. 7 and 16 shown engagement position biased.

The biasing device 198 can in particular comprise a biasing spring 200, which is fixed to the housing 108 of the tensioning device 100 at a housing-side end region 202 and to the guide element 196 at a guide-element-side end region 204.

The guide element 196 and the pretensioning device 198 form components of a decoupling device 206 of the clamping device 100, by means of which the thread 172 of the clamping screw 168 can be brought out of engagement with the engagement section 176 of the clamping arm 136.

This decoupling device 206 further comprises a latching device 208, by means of which the guide element 196 can be latched relative to the housing 108 in the engaged position and in the release position.

How best to look Fig. 8 As can be seen, the latching device 208 includes two latching parts 210, which are located between one in the Fig. 8 and 14 shown locking position, in which the locking parts 210 lock the guide element 196 in the engaged position or in the release position and one in the Fig. 9 and 10 shown unlocking position, in which the locking parts 210 release a movement of the guide element 196 from the engagement position into the release position or from the release position into the engagement position, are movable.

The movement of the locking parts 210 from the locking position into the unlocking position or from the unlocking position into the locking position preferably takes place along the transverse direction 116 of the clamping device 100.

Both locking parts 210 are preferably guided displaceably in a guide channel 212 of the guide element 196, the guide channel 212 preferably extending through the guide element 196 in the transverse direction 116 of the clamping device 100.

The latching device 208 further comprises a spring element 214, which biases the two latching parts 210 into the latching position.

The spring element 214 can be designed, for example, as a coil spring.

The end regions of the spring element 214 facing away from one another can each be accommodated in a spring element receptacle 216 of one of the latching parts 210.

The two locking parts 210 protrude from the housing 108 of the clamping device 100 in opposite directions 218a and 218b, which are both aligned parallel to the transverse direction 116.

Each of the latching parts 210 is provided at its end facing away from the other latching part 210 with an actuating element 220, which an operator can act on in order to move the respective latching part 210 into the unlocking position.

In particular, it can be provided that an operator simultaneously acts on the actuating elements 220 of both latching parts 210 in order to move the latching parts 210 towards one another into the unlocking position against the elastic restoring force of the spring element 214.

Each of the actuation elements 220 can be designed as an actuation button.

In order to carry out a quick adjustment of the clamping arm 136 over a large pivot angle about the pivot axis 134 of 60° or more using the decoupling device 206 described above, the procedure is as follows:
Starting from the in the Fig. 7 and 8th illustrated working position of the clamping device 100, in which the engagement section 176 of the clamping arm 136 is in engagement with the thread 172 of the clamping screw 168 and the clamping arm 136 is, for example, in its upper end position, the guide element 196 is in the engaged position and the latching parts 210 of the latching device 208 are in the locking position, the locking parts 210 of the locking device 208 are in the in Fig. 9 The unlocking position shown is transferred by an operator engaging the actuating elements 220 of the locking parts 210 and moving them towards one another along the transverse direction 116 of the clamping device 100.

In the in Fig. 9 In the unlocking position shown, the locking parts 210 cause the guide element 196 to move from the figure shown in FIG Fig. 9 shown engagement position in the in Fig. 10 release position shown.

The movement of the guide element 196 from the in Fig. 9 shown engagement position in the in Fig. 10 The release position shown occurs in that the operator acting on the actuating elements 220 moves the latching parts 210 in the longitudinal direction 114 of the clamping device 100 from the front of the housing 108, at which the clamping arm 136 emerges from the housing 108, to the rear, to the rear of the housing 108 there, postponed.

This state, in which the guide element 196 is in the release position and the latching parts 210 are in the unlocking position, is except in Fig. 10 also in the Fig. 11 and 12 shown.

Because the operator no longer acts on the actuating elements 220 of the latching parts 210, the latching parts 210 are moved apart by the spring element 214 in the directions 218a, 218b, so that they reach their position in the Fig. 13 and 14 assume the locking position shown, in which the locking parts 210 lock the guide element 196 in the release position.

How out Fig. 15 As can be seen, in this state of the clamping device 100, the engagement section 176 of the clamping arm 136 is out of engagement with the thread 172 of the clamping screw 168, so that the clamping arm 136 is independent of a rotation of the clamping screw 168 relative to the housing 108 of the clamping device 100 from a first Working position, for example the upper end position of the clamping arm 136, can be pivoted into any second working position, for example into the lower end position of the clamping arm 136.

This quick adjustment of the clamping arm 136 saves a lot of setting time that would otherwise have to be used to move the clamping arm 136 into the working position by turning the clamping screw 168 about its longitudinal axis 170 from the first working position, for example the upper end position of the clamping arm 136, to the second Working position, for example the lower end position of the clamping arm 136, to move.

When the clamping arm 136 has been moved into the desired second working position, for example into the lower end position of the clamping arm 136 (see Fig. 16 ), the guide element 196 is transferred from the release position back into the engagement position by an operator moving the latching parts 210 against the elastic restoring force of the spring element 214 from the latching position, in which the latching parts 210 lock the guide element 196 in its release position, into the unlocking position, in which the latching parts 210 enable movement of the guide element 196 from the release position into the engagement position.

Subsequently, the guide element 196, which has been released from the locking position in the release position, is moved by the biasing device 198, in particular the biasing spring 200, from the release position into the engagement position, in which the thread 172 of the tension screw 168 is again in engagement with the engagement section 176 of the tension arm 136.

As soon as the guide element 196 has reached the engaged position, the latching parts 210 are moved by the spring element 214 along the directions 218a and 218b from the unlocking position into the latched position, so that the guide element 196 is locked in the engaged position and secured against moving back into the release position.

This means that it is in Fig. 16 shown working position of the clamping device 100 is reached, in which the clamping arm 136 is in the desired second working position, for example in the lower end position of the clamping arm 136.

How best from the Fig. 7 and 16 As can be seen, the clamping device 100 comprises an upper chip protection element 222 and a lower chip protection element 224, these chip protection elements 222, 224 each at least partially covering a gap between two opposing inner walls 226a, 226b of the housing 108 of the clamping device 100, so that an interior space 228 of the housing 108, in which the engagement section 176 of the clamping arm 136 and the thread 172 of the clamping screw 168 are arranged, is protected by the chip protection elements 222, 224 against the ingress of chips and / or other contaminants from the outer space 142 of the housing 108.

The upper chip protection element 222 is fixed to a ceiling wall 230 of the housing 108 and extends both in Fig. 7 shown upper end position of the clamping arm 136 as well as in the in Fig. 16 shown lower end position of the clamping arm 136 up to an upper peripheral surface 232 of the clamping arm 136 or at least up to the vicinity of this upper peripheral surface 232.

An edge section 234 of the upper chip protection element 222 facing the clamping arm 136 preferably rests on the upper peripheral surface 232 of the clamping arm 136 or is spaced from the upper peripheral surface 232 of the clamping arm 136 by less than 2 mm, in particular by less than 1 mm.

The lower chip protection element 224 is fixed to a bottom wall 236 of the housing 108 and extends to a lower peripheral surface 238 of the clamping arm 136 or at least to the vicinity of the lower peripheral surface 238.

Preferably, an edge section 240 of the lower chip protection element 224 facing the clamping arm 136 rests on the lower peripheral surface 238 of the clamping arm 136 or is spaced from the lower peripheral surface 238 of the clamping arm 136 by less than 2 mm, in particular by less than 1 mm.

Each of the chip protection elements 222, 224 can in particular be essentially plate-shaped and/or essentially sheet-shaped.

How best from the Fig. 3 and 4 As can be seen, the free end region 144 of the clamping arm 136 has a longitudinal center plane 242 which runs through the longitudinal axis 170 of the clamping screw 168, preferably regardless of whether the clamping screw 168 is in the engaged position or in the release position and preferably independently of which working position the clamping arm 136 is in.

In order to achieve that an actuation tool 244 (see the Fig. 17 to 22 ) from the area above the tension arm 136 on the side of the tension arm 136 can extend past into the area of the fastener receptacle 124 of the housing 108 of the clamping device 100, the clamping arm 136 is provided with an offset 246, which is formed and arranged on the clamping arm 136 in such a way that a side wall facing the fastener receptacle 124 250 of the tensioning arm 136 in the bent region 248 of the tensioning arm 136 is offset by the distance Δ along the transverse direction 116 of the tensioning device 100 relative to the same side wall 250 in the free end region 144 of the tensioning arm 136, namely away from a lateral edge 252 of the fastener receptacle 124 an inner wall 226b of the housing 108 facing away from this lateral edge 252 of the fastener receptacle 124.

The side wall 150 of the clamping arm 136 in the free end region 144 of the clamping arm 136 on the one hand and the lateral edge 252 of the fastener receptacle 124 on the other hand lie almost in the same plane, which runs perpendicular to the transverse direction 116 of the clamping device 100, and the offset Δ generated by the offset 246 is almost the same size as the width of the fastener receptacle 124, that is to say its extent in the transverse direction 116, so that the bent region 248 of the clamping arm 136 is the fastener receptacle 124 - seen in the top view from above along the height direction 118 of the clamping device 100 - overlapped only to a small extent or not at all.

It is therefore possible for the actuating tool 244 to extend laterally past the bent region 248 of the clamping arm 136 to a fastener 128 of the clamping device 100 received in the fastener receptacle 124 when the clamping arm 136 is in its upper end position, as is the case in the Fig. 17 to 19 is shown.

The actuating tool 244 can be designed, for example, as an Allen key 254, which has a long rectilinear tool section 256, a short rectilinear tool section 258 and a curved tool section 260 connecting the short rectilinear tool section 258 and the long rectilinear tool section 256 to one another.

Like from the Fig. 17 to 19 can be seen, the long straight tool section 256 can extend laterally past the clamping arm 136 from the bent area 248 of the clamping arm 136 to the fastener 128 received in the fastener receptacle 124, in particular to a fastening screw 130 of the fastener 128, when the clamping arm 136 is in its upper end position.

Like from the Fig. 20 to 22 As can be seen, the bend 246 of the tensioning arm 136 is also designed and arranged on the tensioning arm 136 in such a way that the actuating tool 244, which engages the fastening means 128 arranged in the fastening means receptacle 124, for actuating the fastening means 128 is also located laterally on the bent area 248 of the clamping arm 136 can extend past the fastening means 128 when the clamping arm 136 is in its lower end position.

Even in all working positions of the clamping arm 136 between the upper end position and the lower end position of the clamping arm 136, the actuating tool 244 can be arranged on the clamping device 100 in such a way that it extends laterally past the bent area 248 of the clamping arm 136 from above the clamping arm 136 to extends to the fastener 128 to engage and actuate the fastener 128 to secure the tensioner 100 to the substrate 126.

Like from the Fig. 3 and 4 As can be seen, the bend 246 on the clamping arm 136 is also designed in such a way that a side wall 262 of the clamping arm 136 facing away from the fastener receptacle 124 is in the bent position Region 248 opposite the free end region 144 of the clamping arm 136 along the transverse direction 116 of the clamping device 100 from the lateral edge 252 of the fastener receptacle 124 to an inner wall 226b of the housing 108 facing away from the lateral edge 252 of the fastener receptacle 124 by the distance Δ ' is offset.

If the offset Δ 'of the side wall 262 of the clamping arm 136 facing away from the fastener receptacle 124 is the same size as the offset Δ of the side wall 250 of the clamping arm 136 facing the fastener receptacle 124, then the clamping arm 136 points in its free end region 144 and in the bent area 248 has the same width, that is to say the same extent along the transverse direction 116 of the clamping device 100.

If the offset Δ' of the side wall 262 facing away from the fastener receptacle 124 is smaller than the offset Δ of the side wall 250 facing the fastener receptacle 124, the clamping arm 136 has a smaller width in the bent region 248 than in the free end region 144.

If the offset Δ' of the side wall 262 facing away from the fastener receptacle 124 is greater than the offset Δ of the side wall 250 of the clamping arm 136 facing the fastener receptacle 124, the clamping arm 136 has a greater width in the bent region 248 than in the free end region 144.

The angle which the longitudinal axis of the long rectilinear tool section 256 of the actuating tool 244 includes with the height direction 118 of the clamping device 100 when the actuating tool 244 extends laterally from above the clamping arm 136 past the bent area 248 of the clamping arm 136 to a point in the fastening means. Recording 124 recorded fastener 128 extends, is preferably less than 10 °, in particular less than 5 °.

This applies when the tensioning arm 136 is in its upper end position, when the tensioning arm 136 is in its lower end position and / or when the tensioning arm 136 is in a working position lying between the upper end position and the lower end position.

In order to fasten the clamping device 100 by means of the fastening means 128 to a surface 126, for example a machine table, which has a T-slot (not shown), the T-slot piece 132 is inserted into the relevant T-slot, the clamping device 100 is opened in this way arranged on the ground 126 so that the fastener receptacle 124 is located above the T-slot piece 132 in the height direction 118 of the clamping device 100, and the fastening screw 130 is inserted into the fastener receptacle 124 in such a way that its thread engages with the internal thread of the T -Groove piece 132 comes.

The actuating tool 244 is then brought into engagement with the head of the fastening screw 130 in such a way that the long straight tool section 256 extends from the fastening screw 130 laterally past the bent area 248 of the clamping arm 136 into the area above the clamping arm 136, as shown in FIG the Fig. 17 to 22 is shown.

An operator then engages the short, rectilinear tool section 258 of the actuating tool 244 in order to rotate the long, rectilinear tool section 256 about its longitudinal axis and thereby screw the fastening screw 130, which is in engagement with the actuating tool 244, into the internal thread of the T-slot piece 132 until the T-slot piece 132 and the housing 108 of the clamping device 100 are clamped against the surface 126, for example a machine table, so that the clamping device 100 is releasably secured to the surface 126.

In order to prevent rotation of the housing 108 of the clamping device 100 relative to the substrate 126 during the fastening process and/or during the operation of the clamping device 100 for clamping a workpiece, an anti-rotation device 264 is provided on the underside of the housing 108, which in particular acts as a recess can be designed with a non-rotationally symmetrical cross section (see Fig. 4 ).

In the exemplary embodiment shown, the anti-rotation device 264 is designed, for example, as a substantially cuboid-shaped recess in the bottom wall 236 of the housing 108.

The anti-rotation device 264 can be brought into engagement with a complementary positioning element when the clamping device 100 is placed on the base 126, so that the engagement between the positioning element fixed to the base 126 and the anti-rotation device 264 on the housing 108 of the clamping device 100 prevents rotation of the Housing 108 of the clamping device 100 is prevented relative to the substrate 126.

One in the Fig. 23 to 35 Illustrated second embodiment of a clamping device 100 for clamping a workpiece 102 differs from that in the Fig. 1 to 22 illustrated first embodiment in that in this second embodiment of the clamping device 100 no decoupling device 206 is provided, by means of which the thread 172 of the clamping screw 168 can be brought out of engagement with the engagement section 176 of the clamping arm 136.

Rather, in this embodiment, as best seen in the sectional view of Fig. 25 can be seen, the clamping screw 168 is rotatably mounted on the top wall 230 of the housing 108 about its longitudinal axis 170 by means of a stationary upper bearing 266 and by means of a stationary Lower bearing 268 is rotatably mounted on the bottom wall 236 of the housing 108 about its longitudinal axis 170.

In this embodiment, the longitudinal axis 170 of the clamping screw 168 is always preferably aligned essentially parallel to the height direction 118 of the clamping device 100.

In this embodiment, the thread 172 of the clamping screw 168 is always in engagement with the engagement section 176 of the clamping arm 136.

The tensioning arm 136 can therefore only be moved from a first working position to a second working position by rotating the tensioning screw 168 about its longitudinal axis 170, the rotation of the tensioning screw 168 being caused by an operator using a suitable actuating tool on the actuation end part 190 of the tensioning screw 168 attacks and rotates it.

How best to look Fig. 24 As can be seen, in this embodiment the clamping arm 136 includes a bearing section 270 on both its left side and its right side, which is pivotally mounted on a side wall 272 of the housing 108 about the pivot axis 134 of the clamping arm 136.

An outside 274 of each bearing section 270 is visible from the outside space 142 of the housing 108.

An index marking 156 is arranged on the outside 274 of the respective bearing section 270.

In this embodiment, the housing 108 of the clamping device 100 is provided with two working position scales 154, each on an inner edge 276 of the housing 108 are provided, which lies opposite an edge of the respectively assigned bearing section 270 of the clamping arm 136.

As in the first embodiment, each working position scale 154 includes a plurality of working position markings 158, in particular an upper end position marking 160a, a lower end position marking 160b and one or more intermediate position markings 162a, 162b and/or 162c.

The index mark 156 preferably extends in a direction directed radially to the pivot axis 134 of the clamping arm 136.

The index marking 156 can be designed, for example, as a depression or as an elevation on the bearing section 270 of the clamping arm 136.

Alternatively, it can be provided that the index marking 156 stands out from the surrounding area of the bearing section 270 of the clamping arm 136 due to its color and/or its brightness.

The working position markings 158 preferably extend in a direction directed radially to the pivot axis 134 of the clamping arm 136.

The working position markings 158 can in particular be designed as elevations or depressions on the housing 108.

Alternatively or in addition to this, it is possible for the working position markings 158 to stand out from the area of the housing 108 adjacent to the working position markings 158 due to their color and/or their brightness.

Because on each side of the housing 108 there is a working position scale that interacts with an index marking 156 of the clamping arm 136 154 is present, the respective working position of the clamping arm 136 can be easily and reliably read from both sides of the clamping device 100.

The intermediate position markings 162a, 162b and 162c of the working position scale 154 lying between the upper end position marking 160a and the lower end position marking 160b are preferably arranged on the housing 108 in such a way that the heights H of the pressure piece pivot axis 148 with respect to the support surface 106 of the housing 108 of the clamping device 100, which the pressure piece pivot axis 148 occupies in the various intermediate positions of the clamping arm 136, to which the intermediate position markings 162a, 162b and 162c are assigned, and in the lower end position of the clamping arm 136, which is assigned the lower end position marking 160b, one essentially form an equidistant sequence.

What does this mean for the relationship between the heights H _o and H _u , which the pressure piece pivot axis 148 occupies in the upper end position or in the lower end position of the clamping arm 136, and the heights H ₁ , H ₂ and H ₃ , which the pressure piece - Pivot axis 148 occupies the intermediate positions assigned to the first intermediate position marking 162a, the second intermediate position marking 162b or the third intermediate position marking 162c, which means that this has already been explained above in connection with the first embodiment of the clamping device 100.

If the working position scale 154 includes n intermediate position markings 162, the height difference ΔH of the heights which the pressure piece pivot axis 148 assumes in two successive intermediate positions generally applies: ΔH = (H _o - H _u ) / (n + 1).

The angle of rotation with respect to the pivot axis 134 of the clamping arm 136, by which the immediately successive working position markings 158 of the working position scale 154 assigned positions of the clamping arm 136 differ from one another, is not constant, but decreases from the upper end position marking 160a to the lower end position marking 160b.

The ones in the Fig. 23 to 35 The second embodiment of the clamping device 100 shown differs from that in the Fig. 1 to 22 illustrated embodiment further by the design of the chip protection elements 222 and 224, which at least partially cover the space between the two opposing inner walls 226a, 226b of the housing 108 of the clamping device 100, so that the interior 228 of the housing 108, in which the engagement section 176 of the clamping arm 136 and the thread 172 of the clamping screw 168 are arranged, by the chip protection elements 222, 224 against penetration of chips and / or other contaminants from the outer space 142 of the housing 108 is protected.

In particular, the upper chip protection element 222 can comprise a projection 280 arranged on the top wall 230 of the housing 108, which is provided with a cover 282.

The cover 282 can be formed, for example, from a plastic material, in particular an elastomeric material.

The cover 282 can be connected to the projection 280 in a detachable or non-detachable manner, in particular in a materially bonded manner, from the projection 280.

In this embodiment, the lower chip protection element 224 is, for example, angled and includes a housing-side section 284 and a clamping arm-side section 286, the housing-side section 284 and the clamping arm-side section 286 preferably enclosing an obtuse angle α with one another.

The clamping arm-side section 286 and/or the housing-side section 284 of the lower chip protection element 224 is preferably essentially plate-shaped and/or essentially leaf-shaped.

The housing-side section 284 of the lower chip protection element 224 can be releasably secured to the bottom wall 236 of the housing 108 of the clamping device 100, for example by means of a fastening screw 288.

The upper and lower chip protection elements 222 and 224 disclosed in connection with the first embodiment and the second embodiment of the clamping device 100 can be interchanged with one another and/or combined with one another as desired.

In particular, any configuration of an upper chip protection element 222 can also be used as a configuration of a lower chip protection element 224, any configuration of a chip protection element 222 or 224 that has been described in connection with the first embodiment can also be used as a configuration of a chip protection element 222 or 224 of the second embodiment and any configuration of a chip guard member 222 or 224 of the second embodiment may be used as a configuration of one of the chip guard members 222 or 224 of the first embodiment.

As in the first embodiment, in the second embodiment of the clamping device 100, the pressure piece 146, which is arranged on a free end region 144 of the clamping arm 136 facing away from the pivot axis 134 of the clamping arm 136, preferably includes a pressure piece base body 150, which is connected to the clamping arm 136, and a pressure piece insert 152 which is detachably connected to the pressure piece base body 150.

The pressure piece insert 152 is preferably connected to the pressure piece base body 150 by positive locking.

In particular, it can be provided that the pressure piece insert 152 is detachably secured to the pressure piece base body 150 by means of a tongue-and-groove connection.

In the Fig. 23 to 25 Four different pressure piece inserts 152a, 152b, 152c and 152d are shown as an example, which can be optionally arranged on the pressure piece base body 150 and exchanged for one another.

The first pressure piece insert 152a has a substantially flat clamping surface 290, which faces away from the pressure piece base body 150 when the pressure piece insert 152a is mounted on the pressure piece base body 150 and when using the clamping device 100 for clamping a workpiece 102 the workpiece 102 rests.

The second pressure piece insert 152b is provided with one or more grooves 292 on the clamping surface 290 facing away from the pressure piece base body 150 when the pressure piece insert 152b is in the assembled state, through which the clamping surface 290 is profiled, so that the pressure piece insert 152b is with its clamping surface 290 can dig into the workpiece 102 to be clamped in order to increase the adhesion between the pressure piece 146 and the workpiece 102 to be clamped.

The grooves 292, as shown in the drawing, can run parallel to the transverse direction 116 of the clamping device 100 or run parallel to the longitudinal direction 114 of the clamping device 100 or run in any other direction.

In the third pressure piece insert 152c, a recess 294 is provided on the clamping surface 290 facing away from the pressure piece base body 150 in the mounted state of the pressure piece insert 152c, which recess extends in the transverse direction 116 of the clamping device 100 and preferably has a trapezoidal or triangular cross section perpendicular thereto having.

In the fourth pressure piece insert 152d, the clamping surface 290 facing away from the pressure piece base body 150 in the assembled state of the pressure piece insert 152d is provided with a recess 294 ', which extends parallel to the longitudinal direction 114 of the clamping device 100 and preferably perpendicular to this direction trapezoidal or triangular cross section.

Through the recess 294 or 294 'of the third pressure piece insert 152c or the fourth pressure piece insert 152d, a particularly good force transmission from the pressure piece 146 to a workpiece 102 can be achieved, which is a workpiece that is at least partially complementary to the respective recess 294 or 294' -Section has.

As an alternative to the structure of the pressure piece 146 described above, the pressure piece 146 can also be designed as in the first embodiment described above Fig. 56 to 60 shown and explained above in connection with the description of the first embodiment of the clamping device 100.

Incidentally, that is correct Fig. 23 to 35 Illustrated second embodiment of a clamping device 100 in terms of structure, method of manufacture and function with that in the Fig. 1 to 22 illustrated first embodiment, to the above description reference is made in this respect.

One in the Fig. 36 to 45 illustrated third embodiment of a clamping device 100 for clamping a workpiece 102 differs from that in the Fig. 23 to 35 illustrated second embodiment in that the clamping arm 136 has no bend 246, which is formed and arranged on the clamping arm 136 in such a way that an actuating tool 244 engaging on the fastening means 128 for actuating the fastening means 128 is in at least one working position of the clamping arm 136 relative to the Housing 108 can extend laterally past a bent area 248 of the clamping arm 136 to the fastening means.

Instead, in this third embodiment of the clamping device 100 it is provided that the clamping arm 136 has a recess 296, which is formed and arranged on the clamping arm 136 in such a way that an actuating tool acting on the fastening means 128 for actuating the fastening means 128 is in at least one working position of the Clamping arm can extend relative to the housing 108 through the recess 296 to the fastener 128 received in the fastener receptacle 124.

How best from the Fig. 36 and 38 As can be seen, the recess 296 is arranged between the pivot axis 134 of the clamping arm 136 on the one hand and the free end region 144 of the clamping arm 136, on which the pressure piece 146 is arranged, on the other hand.

The recess 296 is designed as a passage opening 298, which extends from an upper side 300 of the clamping arm 136, which faces away from the fastener receptacle 124, through the clamping arm 136 up to an underside 302 of the clamping arm 136, which faces the fastener receptacle 124, extends through the clamping arm 136.

In the third embodiment, the recess 296 is designed as an elongated hole which extends along the longitudinal direction of the clamping arm 136 and parallel to the longitudinal center plane 242 of the free end region 144 of the clamping arm 136.

The recess 296 is designed and arranged on the clamping arm 136 so that the actuating tool 244 is in both the Fig. 40 to 42 shown upper end position of the clamping arm 136 as well as in the Fig. 43 to 45 shown lower end position of the clamping arm 136 can extend through the recess 296 to the fastening means 128.

The clamping arm 136 is pivoted in the lower end position by an angle of at least 30°, in particular of at least 45°, particularly preferably of at least 60°, relative to the upper end position relative to the housing 108 of the clamping device 100 about the pivot axis 134.

Furthermore, the recess 296 is designed and arranged on the clamping arm 136 in such a way that the actuating tool 244 also extends relative to the housing 108 through the recess 296 to the fastening means 128 in every working position of the clamping arm lying between the upper end position and the lower end position can.

In this embodiment, the clamping arm 136 is preferably designed to be essentially mirror-symmetrical with respect to the longitudinal center plane 242 of the free end region 144 of the clamping arm 136.

Incidentally, that is correct Fig. 36 to 45 illustrated third embodiment of a clamping device 100 in terms of structure, method of manufacture and Function with the in the Fig. 23 to 25 illustrated second embodiment, to the above description reference is made in this respect.

One in the Fig. 46 to 55 Illustrated fourth embodiment of a clamping device 100 for clamping a workpiece 102 differs from that in the Fig. 36 to 45 illustrated third embodiment in that the clamping arm 136 is not provided with a single recess 296 to enable the passage of the actuating tool 244 through the clamping arm 136 in every working position of the clamping arm 136, but the clamping arm 136 has a first recess 296a and a second recess 296b has, wherein the first recess 296a is formed and arranged on the clamping arm 136 so that the actuating tool 244 is in the in the Fig. 50 to 52 shown upper end position of the clamping arm 136 can extend through the first recess 296a to the fastening means 128, and the second recess 296b is formed and arranged on the clamping arm 136 in such a way that the actuating tool 244 is in the in the Fig. 53 to 55 shown lower end position of the clamping arm 136 can extend through the second recess 296b to the fastening means 128.

Both recesses 296a and 296b are designed as passage openings 298 in the clamping arm 136, which extend through the clamping arm 136 from the top 300 of the clamping arm 136 facing away from the fastener receptacle 124 to the underside 302 of the clamping arm 136 facing the fastener receptacle 124 .

How out Fig. 48 can be seen, it can be provided that the first recess 296a and the second recess 296b have a common mouth opening 304 on the underside 302 of the clamping arm 136.

In principle, it can also be provided that the first recess 296a and the second recess 296b open into separate openings on the underside 302 of the clamping arm 136.

At the top 300 of the clamping arm 136, the first recess 296a and the second recess 296b preferably open at separate openings 306a and 306b, respectively.

Incidentally, that is correct Fig. 46 to 55 Illustrated fourth embodiment of a clamping device 100 in terms of structure, method of manufacture and function with that in the Fig. 36 to 45 illustrated third embodiment, to the above description of which reference is made.

Claims (16)

1. Clamping device for clamping a workpiece (102),

   comprising a housing (108),

   a clamping arm (136) that is pivotably held on the housing (108), and

   a clamping screw (168), which is mounted so as to be rotatable about a longitudinal axis (170) of the clamping screw (168),

   wherein the clamping screw (168) has a thread (172) and the clamping arm (136) has an engagement portion (176), which in a working state of the clamping device (100) is in engagement with the thread (172) of the clamping screw (168),

   wherein the clamping device (100) further comprises a fastening means (128) for fastening the clamping device (100) to a base (126) and comprises a fastening means receptacle (124), and

   wherein the clamping arm (136) has at least one recess (296; 296a, 296b), which is arranged and formed on the clamping arm (136) such that an actuating tool (244) engaging on the fastening means (128) for actuating the fastening means (128) is able to extend through the recess (296; 296a, 296b) up to the fastening means (128) in at least one working position of the clamping arm (136) relative to the housing (108),

   characterized in that

   the clamping arm (136) has at least one first recess (296a) and one second recess (296b) and is pivotable relative to the housing (108) between a first working position and a second working position, wherein the first recess (296a) is configured such that the actuating tool (244) is able to extend through the first recess (296a) up to the fastening means (128) in the first working position, and

   the second recess (296b) is configured such that the actuating tool (244) is able to extend through the second recess (296b) up to the fastening means (128) in the second working position.
2. Clamping device for clamping a workpiece (102),

   comprising a housing (108),

   a clamping arm (136) that is pivotably held on the housing (108), and

   a clamping screw (168), which is mounted so as to be rotatable about a longitudinal axis (170) of the clamping screw (168),

   wherein the clamping screw (168) has a thread (172) and the clamping arm (136) has an engagement portion (176), which in a working state of the clamping device (100) is in engagement with the thread (172) of the clamping screw (168), and

   wherein the clamping device (100) further comprises a fastening means (128) for fastening the clamping device (100) to a base (126) and comprises a fastening means receptacle (124),

   characterized in that

   the clamping arm (136) has at least one bend (246), which is formed and arranged on the clamping arm (136) such that an actuating tool (244) engaging on the fastening means (128) for actuating the fastening means (128) is able to extend laterally past the bent region (248) of the clamping arm (136) up to the fastening means (128) in at least one working position of the clamping arm (136) relative to the housing (108).
3. Clamping device in accordance with Claim 2, characterized in that the clamping arm (136) is pivotable relative to the housing (108) between a first working position and a second working position and the bend (246) is configured such that the actuating tool (244) is able to extend laterally past the bent region (248) of the clamping arm (136) up to the fastening means (128) both in the first working position and in the second working position.
4. Clamping device in accordance with Claim 3, characterized in that the clamping arm (136) in the second working position is pivoted relative to the housing (108) of the clamping device (100) by an angle of at least 30° in relation to the first working position.
5. Clamping device in accordance with either of Claims 3 or 4, characterized in that the bend (246) is configured such that the actuating tool (244) is able to extend laterally past the bent region (248) of the clamping arm (136) up to the fastening means (128) in any position of the clamping arm (136) relative to the housing (108) located between the first working position and the second working position.
6. Clamping device in accordance with any one of Claims 1 to 5, characterized in that the clamping device (100) comprises at least one working position scale (154), which is arranged on the housing (108) or on a component of the clamping device (100) that is connected to the housing (108) in a rotationally-fixed manner, and comprises an index marking (156), which is arranged on the clamping arm (136) or on a component of the clamping device (100) that is connected to the clamping arm (136) in a rotationally-fixed manner, wherein a plurality of working positions of the clamping arm (136) relative to the housing (108) are each associated with a respective predetermined positioning of the index marking (156) relative to the working position scale (154).
7. Clamping device in accordance with Claim 6, characterized in that the working position scale (154) comprises a plurality of working position markings (158), which are associated with various working positions of the clamping arm (136) relative to the housing (108).
8. Clamping device in accordance with Claim 7, characterized in that the clamping arm (136) is provided with a pressure piece (146) and the respective heights (H) of the pressure piece (146) relative to a contact surface (106) of the housing (108) of the clamping device (100) that the pressure piece (146) adopts in each of the various working positions associated with the working position markings (158) form a substantially equidistant sequence.
9. Clamping device in accordance with Claim 8, characterized in that one of the working position markings (158) is an upper end position marking (160a), which is associated with the working position in which the height (H_o) of the pressure piece (146) relative to the contact surface (106) of the housing (108) is maximal.
10. Clamping device in accordance with either of Claims 8 or 9, characterized in that one of the working position markings (158) is a lower end position marking (160b), which is associated with the working position in which the height (H_u) of the pressure piece (146) relative to the contact surface (106) of the housing (108) is minimal.
11. Clamping device in accordance with any one of Claims 6 to 10, characterized in that at least one of the working position scales (154) is arranged on an outer edge (164) of the housing (108).
12. Clamping device in accordance with any one of Claims 6 to 11, characterized in that at least one of the working position scales (154) is arranged on an inner rim of the housing (108), which is located opposite to a rim of a bearing portion (180) of the clamping arm (136).
13. Clamping device in accordance with any one of Claims 1 to 12, characterized in that the clamping arm (136) is provided with a pressure piece (146), which comprises a pressure piece base body (150) and a pressure piece insert (152; 152') that is releasably connected to the pressure piece base body (150).
14. Clamping device in accordance with Claim 13, characterized in that the pressure piece insert (152') is releasably connected to the pressure piece base body (150) by means of a magnet element (310).
15. Combination of a clamping device (100) in accordance with any one of Claims 1 to 14 and an actuating tool (244) for actuating a fastening means (128) for fastening the clamping device (100) to a base (126).
16. Combination in accordance with Claim 15, characterized in that the actuating tool (244) has a substantially rectilinear tool portion (256), which extends from the recess (296; 296a, 296b) or from the bent region (248) of the clamping arm (136) up to the fastening means (128) when the actuating tool (244) is used for actuating the fastening means (128).

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