EP2363246A2 - Screw attachment and screwing device equipped therewith - Google Patents

Abstract

The screw attachment (30) has a screw device with a drive motor, a device coupling device for coupling with the screw device and an output part (54), on which a tool holder (55) for holding a screwing tool (25) is arranged. A depth stop sleeve (73) is pivoted on a depth stop holder (72) of a depth adjusting device by a pivot bearing (84).

Description

The invention relates to a screwdriver for screwing in with a drive motor having a screwdriver, with a device coupling device for coupling with the screwdriver and a drive part with respect to a rotation axis non-rotatable connection with a device output of the screwdriver, with a driven part to which a tool holder for Receiving a Schraubwerkzeugs is arranged and which is rotatably connected or drehverbindbar to the drive part by a rotary coupling device, with a depth stop holder for holding a depth for setting a screw depth depth stop sleeve, and with a Tiefeneinstelleinrichtung for adjusting a longitudinal position of the mounted on a base body depth stop bracket relative to the tool holder.

Such Schraubvorsätze for screwing screws into a workpiece are well known and are offered by the applicant. The depth stop sleeve is axially adjustable by means of Tiefeneinstelleinrichtung with respect to the axis of rotation, so that the desired screw depth is easily predetermined. When screwing screws in relatively sensitive materials, at least in materials whose surface is easily damaged, the known Schraubvorsatz but leads to problems, namely because the depth stop sleeve rotates with the driven part.

It is therefore an object of the present invention to provide a conveniently manageable screw attachment for screwing in screws with a drive motor having a screwdriver which optimally protects the workpiece to be machined.

To solve the problem is provided in a screw attachment of the type mentioned that the depth stop sleeve is mounted by means of a rolling bearing, in particular a ball bearing, comprehensive rotary bearing rotatably mounted on the depth stop holder of Tiefeneinstelleinrichtung.

The inventive approach is that the depth stop sleeve can rotate freely with respect to the drive side and output side. Thus, therefore, the depth stop sleeve when screwing screws on the workpiece so to speak stop or stop, while the driven part on which the screwing, usually a screwdriver bit, is arranged, continues to rotate to screw the screw to the desired extent in the workpiece.

A basic idea of the invention is that the rolling bearing, for example a ball bearing or roller bearing, has a low friction, so that hardly any drive torques from the drive side (from the screwdriver) act on the depth stop sleeve.

Preferably, the depth stop sleeve is replaceable on the screw attachment. For this purpose, an expedient embodiment of the invention provides that the depth stop sleeve is held by means of a latching arrangement on a depth stop holder, for example, directly to the pivot bearing or on a rotary bearing arranged on the catch holder. Furthermore, instead of or in addition to the latching arrangement, a clamping holder for holding the depth stop sleeve on the depth stop holder may also be provided.

Conveniently, the pivot bearing forms or comprises a locking receptacle, latching holder or a support for the depth stop sleeve.

For locking arrangement or clamping bracket is still to be noted that this can have both recesses on the depth stop holder and corresponding latching hooks or latching projections on the depth stop sleeve and vice versa, that is, on the depth stop holder, in particular the pivot bearing, locking projections or clamping means are arranged, with the corresponding Lock recordings or abutments on the depth stop sleeve or can be clamped.

It will be appreciated that between the depth stop sleeve and the depth stop holder also screw means (e.g., mating screw threads) for screwing and / or plugging means (e.g., at least one plug receptacle and at least one mating projection) may be provided for plugging.

The depth stop sleeve is expediently provided on its free end face with an elastic stop. The stop can be realized for example by a rubber coating or other elastic coating of the depth stop sleeve on its front side. However, it is particularly preferred if the elastic stop comprises a replaceable stop ring. The stop ring may for example form a receptacle for a front-side retaining projection, in particular an annular projection, the depth stop sleeve. It is understood that the reverse arrangement may be made, namely that the depth stop sleeve has a recess, in particular an annular recess, for receiving the stop ring or any other replaceable elastic stop member.

The depth stop holder expediently has a pivot bearing receptacle for the pivot bearing. The pivot bearing receiver is advantageously formed by a step or comprises a step. Thus, so the pivot bearing can be added to save space. Furthermore, it is advantageous if the depth stop sleeve encloses a radial outer circumference of the pivot bearing. Overall, this can be created a compact arrangement. Preferably, the arrangement is made such that the depth stop sleeve radially outwardly comprises the pivot bearing and is substantially identical in contour with an adjacent component of the Schraubvorsatzes, preferably with an operating area of the Tiefanschlaghalters.

The Tiefeneinstelleinrichtung expediently has a screw thread, which is provided between the depth stop holder and the base body. Thus, the depth stop sleeve can be screwed with respect to the base body for adjusting the longitudinal position of the depth stop sleeve. The operation is simple. It is preferred if the screw thread and the rotary coupling device have approximately the same longitudinal position with respect to the axis of rotation of the screw attachment.

Between the depth stop holder and the base body locking means are expediently provided, which serve for a longitudinally fixed or rotationally fixed locking of the depth stop holder with respect to the base body.

Preference is given to a rotationally fixed latching or Drehverrastung. For this purpose, the latching means engage the depth stop holder with respect to the base body in rotational detent positions. The depth stop holder is adjustable by a rotary actuator between the rotational locking positions. Particularly preferred is when only a rotational adjustment of the Depth stop bracket is sufficient to adjust these the rotary latch positions. Thus, no longitudinal displacement is necessary.

Particularly preferred is the combination of a screw thread described later in the exemplary embodiment and a rotational locking of the depth stop holder with respect to the base body. Thus, therefore, the depth stop holder can be adjusted longitudinally by a rotational movement, wherein it locks in rotational positions by means of the locking means. This has the advantage that on the one hand the operation is very easy. All it takes is a simple turning operation of the depth stop holder to effect the longitudinal adjustment of the depth stop holder. On the other hand, the latching means, which are designed in particular as rotary latching means, ensure that the depth stop holder remains in the set longitudinal position, even if a torque acts on the depth stop holder from the depth stop sleeve when the depth stop sleeve strikes the workpiece.

The rotational latching of the depth stop holder is preferably realized in that a radially adjustable latching projection, in particular a spring-loaded latching projection, is provided between the base body and the depth stop holder. The latching projection, which acts, for example, radially outward into a corresponding latching receptacle on the depth stop holder, can be formed for example by a circumferential spring.

Although it is in principle possible that the rotary coupling device is formed by a direct connection of the drive part with the output part. The drive part and the output part can, for example, be directly coupled to one another in a rotationally fixed manner. Furthermore, it is also possible that the output part and the drive part are integral, so that they realize the rotary coupling device as a whole. However, it is preferred that the rotary coupling device comprises a slip clutch, wherein the slip clutch contains on the one hand a clutch drive part and on the other a Kupplungsabtriebsteil. The clutch drive member is rotationally coupled to the drive member, the Kupplungsabtriebsteil with the tool holder having output member. When the output part is loaded in the direction of the drive part along the axis of rotation, both components enter a rotational drive position in which they are rotationally coupled together. In the opposite direction, that is in a release position, acts a release spring, which moves the Kupplungsabtriebsteil away from the clutch drive part, so that the Kupplungsabtriebsteil can rotate freely with respect to the coupling drive part.

Particularly preferred is an arrangement such that between the clutch drive part and the drive part (which is connectable to the screwdriver) a rotary bearing is provided, but limited by rotation stops. The clutch drive part is rotationally coupled to the drive part by means of a rotary coupling member which engages in a screw groove, such that the clutch drive part changes its longitudinal position to the drive part with respect to the rotation axis by a rotation about the rotation axis. Thus, therefore, the Schraubennut, which can be arranged both on the drive part and on the clutch drive part, ensures that the clutch drive part and the Kupplungsabtriebsteil undergo a relative displacement adjustment and a linear adjustment better able to disengage.

Preferred is a compact arrangement or a compact construction of the screw attachment. This contributes expediently when the rotary coupling device is received in an interior of the base body. Furthermore, it is advantageous if the base body received in an interior of the depth stop holder is. Overall, an arrangement is thereby made in which the rotary coupling device is placed in the interior of the base body and the depth stop body.

The rotary coupling device expediently has a kind of quick coupling. This includes a coupling receptacle for the device output and at least one connecting element, in particular a ball or other form-fitting body, for engagement in a retaining recess of the screwdriver to set the screw attachment with respect to the axis of rotation of the screwdriver. The connecting element can be actuated with an actuating part, for example a ring or a sleeve. The actuating part serves to actuate the connecting element between a fastening position and a release position. In the attachment position, the connecting element engages in the retaining recess of the screwdriver, which is provided for example on the housing of the screwdriver, but expediently on the device output, wherein the connecting element projects into the coupling receptacle. In contrast, in the release position, the connecting element can be released from the holding receptacle of the screwing, that is disengaged. This is for example possible because the actuating element in the release position allows an adjustment of the connecting element out of engagement with the retaining recess. However, it is also conceivable that the actuating part actively adjusts the connecting element in the direction of the release position.

A particularly compact arrangement, which also also serves to protect against environmental influences, in particular pollution, provides that the depth stop holder and the operating part engage with each other. For example, the actuating part has a receptacle, in particular a ring receiver, for the depth stop holder.

It is preferred if the depth stop holder directly has an actuating part for its adjustment. It is understood that a separate actuating part may be provided for the stop holder.

Furthermore, the invention comprises a suitably electric or pneumatic screwdriver, which is provided with a screw according to the invention.

Figur 1

eine Seitenansicht eines Schraubgerätes sowie eines Schraubvorsatzes in voneinander entferntem Zustand,

Figur 2a

den Schraubvorsatz gemäß Figur 1 in einer seitlichen Explosionsdarstellung,

Figur 2b

den montierten Schraubvorsatz gemäß Figuren 1, 2a in Seitenansicht,

Figur 3

eine alternative Tiefenanschlaghülse sowie einen Stirnanschlag und ein weiteres Schraubwerkzeug zur Verwendung mit dem Schraubvorsatz gemäß Figur 2a,

Figur 4

eine Querschnittsansicht des Schraubvorsatzes gemäß Figuren 1, 2a, und

Figur 5

ein Antriebsteil, einen Basiskörper sowie einen Tiefenanschlaghalter des Schraubvorsatzes gemäß Figuren 1, 2a in schräger Perspektive.

Hereinafter, an embodiment of the invention will be explained with reference to the drawing. Show it:

FIG. 1

a side view of a screwdriver and a Schraubvorsatzes in remote condition,

FIG. 2a

the screw attachment according to FIG. 1 in a side exploded view,

FIG. 2b

the assembled screw attachment according to FIGS. 1 . 2a in side view,

FIG. 3

an alternative depth stop sleeve and a front stop and another screwing tool for use with the screw according to FIG. 2a .

FIG. 4

a cross-sectional view of the screw according to FIGS. 1 . 2a , and

FIG. 5

a drive part, a base body and a depth stop holder of the screw according to FIGS. 1 . 2a in an oblique perspective.

In FIG. 1 a screwdriver 10 is shown in the form of an electric screwdriver. An electric drive motor 12 is housed in a housing 11 of the screwdriver. The drive motor 12 is actuated by means of a switch 13 which is provided on a handle 14 of the housing 11. The housing 11 has a gun-like shape. In the present case, it is a cordless screwdriver, that is, a wireless operated screwdriver. At the bottom of the handle 14, a battery pack or battery pack can be arranged in a conventional manner (not shown).

The drive motor 12 drives a provided on a coupling projection 15 of the housing 11 device output 16. The device output 16 has a device tool holder 17 for the positive reception of a tool, for example a hexagon socket. On the radial outer circumference of the device output 16, a holding recess 18 is further provided, which serves for coupling with attachments, for example, the inventive screw cap 30 described below.

The holding recess 18 is in the present case an annular groove, that is, it allows a setting of the respective intent in several rotational positions on the screwdriver 10. The implement output 16, thus an output shaft, is in front of an end face 19 of the coupling projection 15.

Now it would be possible in principle, a screwing tool 25, for example, a screwdriver bit 26 or a nut 27, with its matching drive projection 28 directly into the tool-tool holder 17 and coupled rotatably with the screwdriver 10 to couple. However, the Schraubvorsatz 30 described below is not only fast and comfortable with the device output 16 coupled, but also allows optimal depth adjustment or an easily realizable depth stop when screwing a screw in a workpiece (not shown), in addition to the best possible workpiece is spared. For example, sensitive or easily scratched or damaged surfaces, especially plasterboard, with the help of the screwdriver in combination with the screw 30 are screwed comfortably and gently, which will become apparent below.

A device coupling device 31 allows a convenient coupling of the screw attachment 30 to the screwdriver 10. The device coupling device 31 comprises a coupling body 32 which has a coupling receptacle 34 for receiving the device output 16 on an end face 33 of the screw attachment 30. In the coupling receptacle 34 is a driving part 35 of the Schraubvorsatzes 30, in this case a pin piece. The form-fitting contour fits into a corresponding, matching, inwardly hexagonal, form-fitting contour on the inside of the device tool holder 17. In the present case, the drive part 35 has, for example, one External hexagon (whereby other contours are conceivable). Thus, when the screw attachment 30 is plugged into the screwdriver 10, the drive member 35 engages in the device tool holder 17 in a form-fitting manner, so that a rotary coupling is realized.

The screw attachment 30 rotates about a rotation axis 22.

The coupling receptacle 34 is cylindrical, for example, and has an inner circumference which approximately matches the outer circumference of the device output 16. When the device output 16 is thus inserted into the coupling receptacle 34, connecting elements 36, in the present case balls, and the holding recess 18 are located opposite one another. The connecting elements 36 (one would be sufficient, in the present case three are provided) are mounted radially movable in bores 37. The connecting elements 36 are acted upon by an actuating part 38 radially inward, when the Actuating member 38 and thus therefore the device coupling device 31 are in their attachment position, the in FIG. 4 is shown. Then pushes an inner, on the outer circumference of a coupler receiving 34 coaxial coupling extension 39 along the axis of rotation 22 axially movably mounted actuating ring 40, the connecting elements 36 radially inward so that they engage in the holding recess 18. However, if the actuating ring 40 is moved in the direction of an arrow 41 into its release position (at the same time the release position of the device coupling device 31), that is displaced along the axis of rotation 22, recesses 42 arrive on the inside of the actuating ring 40 in the region of the holes 37, so that the Connecting elements 36 are displaced radially outward in the direction of the recesses 42, out of engagement with the retaining recess 18 (ring) reach and the screw 30 is removable from the screwdriver 10.

The actuating ring 40 is at least longitudinally connected to a handle ring 43 of the actuating part 38. The handle ring 43 can be easily grasped by an operator. The handle ring 43 is advantageously particularly wide, that is to say it also has an overlapping part 44 for engaging adjacent components of the screw attachment 30.

The actuating member 38 is loaded by a spring 45 in the mounting position, which is supported on the one hand on the coupling body 32, in particular a step 46, and on the other hand on the actuating part 38, in particular a transition region between the handle ring 43 and the actuating ring 40. The spring 45 is a helical spring, which is penetrated by the coupling extension 39.

The coupling body 32 and the drive member 35 are rotatably connected to each other.

Now it would be possible for the screwing tool 25 or the tool holder for the screwing tool 25 to be coupled in a rotationally fixed manner to the drive part 35 directly.

When Schraubvorsatz 30 but by a rotary coupling device 50, a rotationally fixed connection or coupling of the screw 25 with the drive member 35, as well as a free rotation of the screw 25 is realized. For this purpose, the rotary coupling device 50 has a slip clutch with a clutch drive part 52 which is rotationally coupled to the drive part 35, and with a Kupplungsabtriebsteil 53 which is also rotationally coupled to a driven part 54 for holding the screwing tool 25. While the clutch drive part 52 has a certain rotatability with respect to the drive part 35, the clutch output part 53 is fixedly rotationally coupled to the output part 54 (the two components could also be in one piece).

The output member 54 includes at its free end a tool holder 55 for receiving the screw 25. Although you could, for example, a chuck project here. However, a form-locking holding tool receptacle is preferred, in this case, for example, a hexagonal tool receptacle. In the interior of the tool holder 55 is still advantageous a latching holder 56, for example, a snap ring, for longitudinally holding the Schraubwerkzeugs 25 is provided. At the bottom of the tool holder 55, a magnet 57 for magnetically holding the screwing tool 25 is arranged.

The output member 54 is formed as a kind of sleeve, in the interior of which on the one hand the tool holder 55 and on the other hand a receptacle for a holding projection 58 of the clutch driven part 53 is provided. The retaining projection 58 is rotatably connected to the output part 54, in particular by a pressing.

On an opposite to the retaining projection 58 front side of the Kupplungsabtriebsteils 53, that is on the coupling drive member 52 facing end side, and the clutch drive member 52 itself, driving projections 59 are provided, which in a rotational driving position (not shown) can engage each other, in a release position, however are out of engagement (see FIG. 4 ).

A release spring 60 acts on the Kupplungsabtriebsteil 53 in the release position according to FIG. 4 , The release spring 60 is supported, on the one hand, on a flange projection 61 of the clutch driven part 53 and, on the other hand, on a flange projection 62 of the clutch drive part 52. Thus, therefore, the release spring pushes the Kupplungsabtriebsteil 53 away from the clutch drive member 52 so that they are not in rotary driving connection.

However, if the screw 30 is charged in the opposite direction to the aforementioned arrow 41 by the screwing tool 25 is supported on a screw 23, the Kupplungsabtriebsteil 53 is loaded against the direction of the arrow 41 and moved in the direction of the coupling drive member 52, so that the driving projections 59 engage.

An axle piece 97 forms part of a rotary bearing for rotational mounting of the clutch driven part 53 with respect to the coupling drive part 52 about the rotation axis 22. The axle piece 97 protrudes in front of the bearing projection 64 and is rotatably mounted in a bearing receptacle 98 of the clutch driven part 53. The axle 97 protrudes from the drive part 35, and penetrates with rotational play the coupling drive part 52. The drive part 35 is rotatably connected to the coupling body 32.

If a relatively high torque is exerted at the end of the screwing, the slip clutch 51 acts: the clutch drive member 52 is sleeve-like configured, that is rotatably mounted on a bearing projection 64 of the coupling body 32 which engages in a bearing seat 63 of the clutch drive member 52. However, the rotatability of the clutch drive part 52 on the coupling body 32 is limited by rotation stops. The rotational stops not visible in the drawing are respective end-side ends of a screw groove 65 into which a rotary coupling member 66 engages. The rotary coupling member is rotationally fixed with respect to the coupling drive member 52, but in a parallel to the axis of rotation 22 extending groove 67 longitudinally displaceable. Thus, when the clutch drive member 52 rotates relative to the drive member 35, so to speak rotates the rotary coupling member 66 along the screw groove 65, resulting in an axial displacement of the clutch drive member 52 relative to the coupling body 32 and away from the Kupplungsabtriebsteil 53 and thus also to the drive member 35 along the Rotary axis 22 leads. Among other things, this contributes to the fact that the driving protrusions 59 quickly disengage upon reaching a limit torque and / or upon reaching a desired screw-in depth of the screw 23. Such a screw-in depth can be implemented conveniently and efficiently on the basis of the measures described below for the screw attachment 30 according to the invention.

The Schraubvorsatz 30 includes a depth adjustment 70 with a base body 71 and a depth stop holder 72 which is longitudinally adjustable with respect to the base body 71, namely along the rotation axis 22. The depth stop holder 72 serves to hold a depth stop sleeve 73, which in the direction of Tool holder 55 protrudes to limit a screwing.

The depth stop holder 72 is rotationally fixed relative to the drive side of the Schraubvorsatzes 30. For this purpose, a holder 74, for example a latching hook, a knurl or the like, is provided, which is hooked with a radial projection 75 of the coupling body 32. The radial projection 75 is, for example, a type of flange whose end face or bottom forms a longitudinal stop with respect to the axis of rotation 22 for the clutch drive part 52.

The base body 71 surrounds or encapsulates a plurality of components of the screw attachment 30, in particular the rotary coupling device 50. Above this there is a screw portion 76, in the substantially cylindrical interior of which, inter alia, the release spring 60 and the two coupling components 52, 53 are accommodated. In the direction of the tool holder 55, the screw section 76 ends with a step 77, with which the screw section 76 merges into a bearing section 78. The bearing portion 78 is limited in the region of the tool holder 55 by an end wall 79, which has a passage opening for the output part 54. Consequently, therefore, the output member 54 projects forward in front of the end wall 79.

The bearing section 78 in the present case has a cylindrical shape and accommodates a bearing sleeve 80. The bearing sleeve 80 is rotatably inserted into the bearing portion 78, which expediently forms a kind of receiving cylinder, for example, pressed, pressed, in particular also spraying.

The bearing sleeve 80 in turn is rotatably mounted on the sleeve-like output member 54. Thus, therefore, the output member 54 rotate in the interior of the base body 71, wherein this rotation is then not required when the slip clutch 51 is in rotational drive engagement.

On the base body 71 of the depth stop holder 72 is screwed with a screw 81. The screw portions 76, 81 have matching screw threads with a small pitch, so that a fine adjustment or depth adjustment of the depth stop holder 72 with respect to the base body 71 along the axis of rotation 22 is possible. The screw portion 81 merges with a step 82 in a pivot bearing receptacle 83. The pivot bearing receiver 83 has an inner cylindrical diameter that matches an outer cylindrical diameter of the bearing portion 78. The pivot bearing receiver 83, which is thus cylindrical, receives on its inner side the bearing section 78 of the base body 71.

The stage 82 or pivot bearing receptacle 83 is used to hold a pivot bearing 84, which is a rolling bearing, namely a ball bearing (roller bearings, needle roller bearings or the like would also be possible).

The pivot bearing 84 also serves as a support base for the depth stop sleeve 73, which is mounted with a bearing portion 85 on the pivot bearing 84, namely on the outer ring. The bearing portion 85 has a corrugation on its outside, so that it can be easily grasped. This corrugation serves in particular to subtract the depth stop sleeve 73 from the screw attachment or pivot bearing 84.

The attachment of the depth stop sleeve 73 on Schraubvorsatz 30 is particularly simple by a latching arrangement 86. The latching arrangement 86 comprises latching hooks 87, for example two or three latching hooks 87, which have a spring tension radially inward and thus engage with the outer ring of the pivot bearing 84. Then there are locking projections 88 of the locking hooks 87 radially in front of a Depth stop holder 72 facing side of the pivot bearing 84 before the same before.

Thus, therefore, the pivot bearing 84 is completely surrounded in the bearing portion 85 on the outside, so that the pivot bearing 84 is protected.

Furthermore, the outer circumference of the bearing portion 85 is made to approximately correspond to the outer circumference of an operation portion 89 of the depth stopper holder 72. The actuating portion 89 extends between the depth stop sleeve 73 and the actuating part 38, in particular the handle ring 43. There, the actuating portion 89 is overlapped by the overreaching part 44, in other words said the actuating portion 89 of the depth stop holder 72 engages in an interior of the actuating part 38.

At the free, located in the tool holder 55 end face of the depth stop sleeve 73, a support ring 90 is provided, mainly of metal, so that the depth stop sleeve 73 is particularly robust. The support ring 90 carries a stop ring 91, in this case made of elastic material. The stop ring 91 is attached to the support ring 90, so that it is easily replaceable. In addition, the stop ring 91 allows an elastic end stop on the workpiece.

Furthermore, the stop ring 91 increases a friction of the depth stop sleeve 73 on the workpiece, so that the depth stop sleeve 73 is decelerated and does not continue to rotate, even if a respective screwing is not yet completed.

A related to a workpiece friction coefficient of the depth stop sleeve 73 is at its front side, for example by the stop ring 91, a suitable coating or a suitable base material of the depth stop sleeve 73 (soft plastic, Rubber or the like), advantageously much lower than a bearing friction of the pivot bearing 84th

Although the depth stop sleeve 73 can rotate with respect to the depth stop holder 72 due to the pivot bearing 84 with very little resistance. Nevertheless, it would be conceivable in principle that a certain torque is transmitted from the depth stop sleeve 73 to the depth stop holder 72, which could lead to a twisting of the depth stop holder 72 and thus a screw adjustment and Längsverstellen same with respect to the base body 71. In contrast, locking means 92, which serve for a rotational locking of the depth stop holder 72 with respect to the base body 71, act.

The latching means 92 comprise a latching projection 93, which engages in corresponding latching recesses 94. In the present case, the latching projection 93 is provided on the outer circumference of the base body 71, namely on a latching portion 95, while the latching recesses 94 are provided on the depth stop holder 72. The latching projection is loaded radially outward and engages in the radially inner recesses of the depth stop holder 72 a. In the present case, the latching recesses 94 are arranged on the inner circumference of the depth stop holder 72. The latching recesses 94 are provided by longitudinal grooves which extend parallel to the axis of rotation 22. Now you could configure the locking projection 93 in one piece with the base body 71. In the present case, however, it is arranged on a spring 96 which is non-rotatably connected to the base body 71. The spring 96 is a kind of annular spring or partial ring spring, projects from the radially outwardly of the locking projection 93.

Embodiments of the invention are readily possible:

Thus, the locking assembly 86 allows easy replacement of the depth stop sleeve 73 against an alternative in FIG. 3 With regard to the axis of rotation 22, the depth stop sleeve 100 projects, for example, further ahead of the tool holder 55, but otherwise it is of a similar configuration to the depth stop sleeve 73.

Furthermore, it would be conceivable that the depth stop sleeve 100 or a depth stop sleeve, not shown, for example, directly on its front side has an elasticity or a frictional engagement, e.g. because of a

As an alternative to the stop ring 91, a stop ring 101 could also be provided, which has a corrugation 102 on its end face facing or facing the workpiece.

In the case of a depth stop sleeve according to the invention, it is therefore also possible for a frictional connection to improve structuring, e.g. the aforementioned corrugation, be provided on its end face 103 facing the workpiece.

It is understood that the screw attachment according to the invention is also applicable to a pneumatic screwdriver or a wired electric screwdriver.

Claims (12)

Screw attachment for screwing in screws (23) with a drive motor (12) having screwing device (10), with a device coupling device (31) for coupling with the screwdriver (10) and a drive part (35) relative to a rotational axis (22) non-rotatable connection with a device output (16) of the screwdriver (10), with a driven part (54) on which a tool holder (55) for receiving a screwing tool (25) is arranged and which is connected to the drive part (35) by a rotary coupling device (50 ) and a Tiefeneinschlaginrichtung (70) for adjusting a longitudinal position of the mounted on a base body (71) depth stop holder (72) on a depth stop holder (72) for holding a provided for setting a screw depth depth stop sleeve (72) relative to the tool holder (55), characterized in that the depth stop sleeve (73) by means of a rolling bearing, in particular a ball bearing, comprehensive pivot bearing (84) is rotatably mounted on the depth stop holder (72) of the Tiefeneinstelleinrichtung (70). Screw attachment according to claim 1, characterized in that the depth stop sleeve (73) by means of a latching arrangement (86) and / or a clamping bracket on the depth stop holder (72), in particular the pivot bearing (84) is supported. Screw attachment according to claim 1 or 2, characterized in that the depth stop sleeve (73) at its free End face (103) has a particularly replaceable elastic stop, in particular a replaceable stop ring (91), and / or a friction coating and / or a friction structure. Screw attachment according to one of the preceding claims, characterized in that the depth stop holder (72) has in particular a step (82) designed pivot bearing receptacle (83) for the pivot bearing (84) and / or that the depth stop sleeve (73) has a radial outer circumference of the pivot bearing ( 84) encloses. Screw attachment according to one of the preceding claims, characterized in that a screw thread is provided between the depth stop holder (72) of the depth adjustment device (70) and the base body (71), with which the depth stop holder (72) for adjusting the longitudinal position of the depth stop sleeve (73) screwed is. Screw attachment according to one of the preceding claims, characterized in that between the depth stop holder (72) of the Tiefeneinstelleinrichtung (70) and the base body (71) latching means (92) for a longitudinally fixed or non-rotatable locking of the depth stop holder (72) with respect to the base body (71) are. Screw attachment according to one of the preceding claims, characterized in that the latching means (92) lock the depth stop holder (72) with respect to the base body (71) in rotational detent positions, and that the depth stop holder (72) is adjustable in particular exclusively by a rotational actuation between the rotational detent positions. Screw attachment according to one of the preceding claims, characterized in that the rotary coupling device (50) has a slip clutch (51) with a coupling drive part (52) rotationally coupled to the drive part (35) and a clutch driven part (53) rotationally coupled to the output part (54) a load of the output part (54) in the direction of the drive part (35) along the rotational axis (22) in a rotational driving position and by a release spring in a release position are adjustable, wherein the Kupplungsabtriebsteil (53) is rotationally coupled in the rotational driving position with the clutch drive member (52) and in the release position with respect to the coupling drive member (52) is freely rotatable. Screw attachment according to claim 8, characterized in that the clutch drive part (52) with respect to the drive part (35) is rotatably mounted between rotational stops, and that the coupling drive member (52) by means of a rotary coupling member (66) which engages in a helical groove (65) the drive part (35) is rotationally coupled such that the coupling drive part (52) by a rotation about the rotation axis (22) changes its longitudinal position to the drive part (35) with respect to the rotation axis (22). Screw attachment according to one of the preceding claims, characterized in that the rotary coupling device (50) in an interior of the base body (71) and / or the depth stop holder (72) is accommodated. Screw attachment according to one of the preceding claims, characterized in that the device coupling device (31) has a coupling receptacle (34) for the device output (16) and at least one connecting element (36) for engagement in a holding recess (18) of the screwdriver (10), about the screw attachment (30) with respect to the axis of rotation (22) on the screwdriver (10) longitudinally fixed, and an actuating part (38), in particular a ring or a sleeve, for actuating the connecting element (36) between a fastening position and a release position, wherein the connecting element (36) in the mounting position in the coupling receptacle (34) protrudes and engages in the holding recess (18) of the screwdriver (10). Screwdriving device (10) with a by a drive motor (12) drivable device output (16) and with a screw attachment (30) according to one of the preceding claims.

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