EP2157026A1 - Clamping device for a bag made of flexible material, and adapter and cartridge each having such a clamping device - Google Patents

Abstract

The device (9) has two clamping plates comprising respective clamping surfaces (12a, 12b), where the device is moved from a closing position to an opening position for removing the clamping of a bag. The clamping surfaces are removed from each other in the opening position of the clamping device. A single-piece cover (19) has a retaining ring that surrounds the clamping plates in the closing position, such that the clamping surfaces engage a clamping position and the cover is removed for moving the clamping device to the opening position. An independent claim is also included for a cartridge comprising an adapter and a clamping device.

Description

Technical area

The invention relates to a clamping device for a cartridge, an adapter which comprises such a clamping device and a cartridge which comprises such a clamping device or such an adapter. Cartridges of the type described are e.g. in fastener technology, to use cavities in which anchors are to be set with a mass or, usually, a mixture of masses, e.g. Synthetic resin mixed with a hardener to fill. The masses are arranged in chambers of a bag, which has a respective discharge opening at a front end thereof. The bag carries at the front end a closure that prevents leakage of the masses.

State of the art

From different scripts, eg from WO 2004/076 078 A1 and WO 2007/026 169 A1 , A closure is known in each case, which consists of a piece of wire, in particular aluminum wire, which is wrapped just behind the front end one to two times tightly around the bag, thus forming a clamp with a narrow opening, which is the connection between the two different masses as a synthetic resin and a hardener containing chambers and the discharge openings at the front end of the bag closes. The bag is arranged in a cylindrical housing having at a front end a nozzle with an opening which carries a mixing nozzle.

If this cartridge is placed on a dispensing gun and this triggered so that it pushes a sliding rear wall of the housing against the front end, so the bag is exerted pressure and the clip is stripped by the action of the masses on its front end, so that the connection between the chambers and the discharge openings is free and the masses can escape there and flow through the nozzle and the mixing nozzle from the cartridge, where they are mixed.

The clip remains essentially unchanged, at best, it is slightly widened. The opening of the chambers of the bag is therefore subject to some uncertainties, as the clip is e.g. can be very tightly squeezed around the bag or even if it has sharp edges, can get caught with him and then difficult to strip. This can lead to the bag bursting open or opening at the rear end, especially if it is closed by a similar clamp. Sharp edges of the clamp can also injure the bag, so that at least some of the masses emerge too far back and contaminate the otherwise reusable housing. The clamp can also move the mixing nozzle if it is not intercepted by special means.

EP 0 754 633 A2 also shows a closure as described above, but which is removed before placing the mixing nozzle. He closes a bag arranged in a housing, the front end of which is pulled through an opening at the end of a nozzle. In addition, a clamping device is provided which clamps the bag between the opening and the closure and prevents its front end from sliding back through the opening into the housing. In one embodiment, the clamping device is formed in the generic manner and consists of two connected by a film hinge halves, which form a roughly cylindrical cap in a closed position in which they are snap-locked together with at one end a lid, which is followed by an annular skirt. In addition, in each of the halves, a somewhat semicircular clamping plate which is slightly set back relative to the cover is attached. The clamping plates form in the closed position between them a relatively narrow round clamping opening through which the end portion of the bag which carries the closure, can not slide back. Before attaching the mixing nozzle, the snap lock is released and transferred the clamping device by unfolding the halves in an open position and removed. Then the end of the bag with the closure is cut off and screwed a mixing nozzle on the neck.

The clamping device serves exclusively to prevent slipping back of the front end of the bag in the housing. In order to keep the bag closed, a closure designed as a clamp is additionally required, which must be removed in a separate step before the attachment of the mixing nozzle. The clamping device alone is not enough to close the bag sufficiently safe because the pressure of the clamping plates is not sufficient and it is therefore not reliable and secure transport attached to the bag. The snap lock of the two halves is not sufficient.

Another clamping device for a cartridge is off FR 1 179 121 A known. A front end of a bag supported in a cylindrical housing on a plate is pulled through between clamping surfaces on a mounted on the housing first clamping part and a displaceably mounted on the same, held by a coil spring in a clamping position second clamping part. Upon retraction of the second clamping member from the clamping position against the force of the coil spring of the bag under the pressure of the plate, acts on a compression spring, paste from. A fuse that holds the clamping parts in the clamping position is not provided.

Out CH 168 590 A a clamping device for closing a bag is known, which consists of two arcuate, connected by a hinge clamping parts made of sheet metal, one of which has a plurality of eyelets and the other a tongue which can engage with each of the eyelets. The clamping parts can thus be locked in a clamping position, but a separate, detachable securing part, which firmly hold the clamping device in the latched position, not provided.

DE 501 373 C shows a closure for a bag for sending coffee and the like., Which has an opening at the end of an externally threaded nozzle, which is surrounded by a wire ring. At this includes an opening into the opening elastic wire loop, in which the twisted together to form a bead front end of the bag is clamped. On the neck a cap is screwed with internal thread. A transfer of the closure in an open position is not possible. The bead can only be pulled out laterally from the wire loop.

Presentation of the invention

The invention is based on the object to provide a generic clamping device, which also serves as a closure, so forms a clamp closure, so that a separate closure, e.g. a clip of wire or the like., Is not required. This object is solved by the features in the characterizing part of claim 1.

The inventive clamping device holds the discharge opening or openings of the bag securely closed. It is also securely clamped to the bag, so that even with greater stresses, such as those occurring during transport, a stripping of the same is not to be feared. According to a preferred embodiment, the clamping device is also designed to be fixed to a housing or to a plate or shell of an adapter, e.g. can be screwed onto a nozzle, which further increases the security against stripping it.

According to the invention, an adapter is proposed, which comprises a generic clamping device and is suitable to be placed on a bag, which can then be inserted into a cylindrical housing, wherein the adapter closes an opening at a front end of the same.

Moreover, according to the invention, a cartridge is proposed which comprises a bag and a clamping device according to the invention which is placed on it and closes it, or an attached adapter according to the invention.

Brief description of the drawings

Fig. 1

perspektivisch einen Sack als Teil einer erfindungsgemässen Kartusche,

Fig. 2

ein Vorderende einer erfindungsgemässen Kartusche gemäss einer ersten Ausführungsform mit einer erfindungsgemässen Klemmvorrichtung gemäss einer ersten Ausführungsform in einem ersten während der Fertigstellung durchlaufenen Zustand,

Fig. 3

ein Vorderende der Kartusche gemäss gemäss der ersten Ausführungsform mit der Klemmvorrichtung in einem zweiten während der Fertigstellung durchlaufenen Zustand,

Fig. 4

ein Vorderende der Kartusche gemäss der ersten Ausführungsform in einem beim Bereitmachen der fertigen Kartusche für den Gebrauch durchlaufenen Zustand,

Fig. 5

ein Vorderende einer erfindungsgemässen Kartusche gemäss einer zweiten Ausführungsform in einem ersten beim Bereitmachen der fertigen Kartusche für den Gebrauch durchlaufenen Zustand,

Fig. 6

die erfindungsgemässe Kartusche gemäss der zweiten Ausführungsform in einem zweiten beim Bereitmachen der fertigen Kartusche für den Gebrauch durchlaufenen Zustand auf einer Abgabepistole,

Fig. 7

eine Seitenansicht einer Klemmvorrichtung gemäss einer zweiten Ausführungsform in Offenstellung,

Fig. 8

einen Schnitt durch die Klemmvorrichtung gemäss der zweiten Ausführungsform längs VIII-VIII in Fig. 7 und

Fig. 9

einen axialen Längsschnitt durch ein Vorderende einer erfindungsgemässen Kartusche mit der Klemmvorrichtung gemäss der zweiten Ausführungsform in Schliessstellung.

In the following the invention will be explained in more detail with reference to figures, which represent only exemplary embodiments.
Show it

Fig. 1

in perspective a bag as part of a cartridge according to the invention,

Fig. 2

a front end of a cartridge according to the invention according to a first embodiment with a clamping device according to the invention according to a first embodiment in a first condition during the completion,

Fig. 3

a front end of the cartridge according to the first embodiment with the clamping device in a second state passed through during the completion,

Fig. 4

a front end of the cartridge according to the first embodiment in a state undergoing the ready-to-use cartridge ready for use;

Fig. 5

a front end of a cartridge according to the invention according to a second embodiment in a first condition when the finished cartridge is ready for use,

Fig. 6

the cartridge according to the invention according to the second embodiment in a second state passed through on readiness of the finished cartridge for use on a dispensing gun,

Fig. 7

a side view of a clamping device according to a second embodiment in the open position,

Fig. 8

a section through the clamping device according to the second embodiment along VIII-VIII in Fig. 7 and

Fig. 9

an axial longitudinal section through a front end of a cartridge according to the invention with the clamping device according to the second embodiment in the closed position.

Ways to carry out the invention

The cartridge according to the invention comprises, in a manner known per se, a bag 1 made of a solid plastic film which has one or more chambers. Typically, these are two chambers that extend in parallel across the length of the bag, and e.g. contain two different masses, which are usually liquids or pastes, such as a synthetic resin and a hardener. The chambers may be open at both ends, the closure is then each formed by a bracket 2 made of a soft wire, e.g. Aluminum wire, which is wrapped tightly one or two times around an end of the bag 1, so that it closes the openings at the ends, but the bag can there also be sealed. The bag 1 is not bulging. At its front end 3 adjoins a portion which is slightly compressed, wherein the bag 1 forms longitudinal folds.

In a cartridge 4 according to the invention according to a first embodiment ( Fig. 2, 3rd ) forms the bracket 2 at the front end 3 of the bag 1 only a provisional Closure. The cartridge 4 has a cylindrical housing 5 made of plastic, which carries at a front end a slightly narrower cylindrical socket 6 with an external thread 7 and at the end of a round opening 8. The bag 1 is inserted to complete the cartridge 4 from an open rear end ago in the housing 5 until its front end 3 protrudes with the clip 2 from the opening 8. The housing 5 is then closed by a longitudinally displaceable rear wall (not shown).

The cartridge 4 is also provided with a clamping device 9 according to a first embodiment, which can be transferred from a closed position to an open position. It has two clamping parts, each clamping part with a half-ring 10a, b. The half-rings 10a, b are connected on one side by a hinge, for example a film hinge. Each of the half-rings 10a, b carries at a front end a half-disk formed inwardly projecting clamping plate 11a; b. The mutually facing in-plane clamping plates 11a, b are provided with central recesses, which are bounded by narrow clamping surfaces 12a, b. In the closed position, the clamping parts are in a clamping position (s. Fig. 3 ), in which the recesses form a narrow central clamping opening 13 bordered by the clamping surfaces 12a, b. Through this ( Fig. 2 ) the front end 3 of the bag 1 with the clip 2. The ring formed by the half-rings 10a, b has an internal thread 14. The first half-ring 10a is provided on a abutment surface 15 with two pins 16, which are opposed by corresponding blind holes 17 in an opposite abutment surface 18 of the second half-ring 10b.

The just described part of the clamping device 9 is placed on the socket 6 and the half rings 10 a, b the Clamping parts folded against each other, so that the abutment surfaces 15 and 18 abut each other and engage the pin 16 to form a plug connection in the blind holes 17. The internal thread 14 of the thus closed ring formed by the half-rings 10 a, b engages with the external thread 7 of the socket 6. The front end 3 of the bag 1 is compressed and narrowed between the clamping surfaces 12a, b of the clamped clamping parts so that the connection between the chambers and the discharge openings is reliably blocked and no mass can escape. The clamp 2 located outside the clamping opening 13 can now be removed, for example by the bag 1 being cut off just behind it ( Fig. 3 ).

Subsequently, the clamping device 9 is transferred into the closed position by a cap 19 with a round lid 20 and a downwardly projecting circumferential skirt 21 formed securing part thereof is attached to the clamping parts. When the cap 19 is mounted, the skirt 21 forms a ring concentrically and closely surrounding the ring formed by the half-rings 10a, b of the clamping parts and slightly conically expanding downwards, which holds the clamping parts in the clamping position, by preventing the half-rings 10a, unfold b and the clamping device 9 opens. In this state, the cartridge 4 can be easily stored and transported.

The cartridge 4 is made ready for use by the clamping device 9 is transferred from the closed position to an open position and removed. For this purpose, the cap 19 is pulled off, thereby releasing the locking of the clamping parts in the clamping position. The half rings 10a, b can now be unfolded easily, bringing the Clamping device is moved into an open position in which the clamping surfaces 12a, b are removed from each other over their entire length and the engagement of the internal thread 14 of the ring with the external thread 7 of the connecting piece 6 is canceled. The clamping device 9 is now completely removed. The connection between the chambers in the bag 1 and the discharge openings is thus free.

On the nozzle 6 is ( Fig. 4 ) Screwed a mixing nozzle 22 with a corresponding internal thread. The modified cartridge is thus ready for use. It can be placed on it or even before removing the cap 19 and the replacement of the clamping device 9 against the mixing nozzle 22 on a dispensing gun of known type, which pushes the sliding back wall against the front end of the cartridge when triggered and so the contents of the chambers from the Dispensing openings and through the mixing nozzle 22 presses. Since the clamping device 9 is completely removed and no closure in the way, the use of the cartridge is easy. Malfunction due to jamming of the clamping device or a rising of the bag in the wrong place are not possible.

In order to facilitate or facilitate the reuse of the housing 5, the same may also be used ( Fig. 5, 6 ) are provided separately, while the cartridge 4 according to a second embodiment, only the bag 1 and a housing 5 fixable adapter 23 comprises a nozzle 6 and a clamping device connected to the same 9, which according to the first embodiment described above or also according to the can be formed below described second embodiment. The adapter 23 comprises a plate or a shell 24 with a front side, in the middle of the nozzle 6 is arranged and, on one of the front side opposite back, a circumferential concave bearing surface, with which it rests against a lying just behind its front shoulder of the bag 1. The contact surface can there also be connected to the bag 1, in particular glued.

In addition, it has a fixing ring 25, which with a back on the front of the shell 24, which forms a corresponding step there, positively engages, so that it is removable only to the front over the nozzle 6 and the clamping device 9, while in the opposite direction Stop is effective. It is provided with two opposite radially outwardly projecting projections 26 which can cooperate as engagement parts with corresponding engagement parts on the housing 5. For this purpose, the housing 5 has a circular opening at a front end, from which two slots 27 extending opposite one another extend, each with a first section 28 which faces the rear end of the housing 5 and a second section 29 angled in the circumferential direction as two, eg four equally distributed over the circumference of such engagement parts and slots may be provided.

The cartridge 4 is inserted with the bag 1 ahead through the opening in the housing 5 ( Fig. 5 ) until the adapter 23 fills and closes the opening. The extensions 26 are each inserted into the slots 27 up to the ends of the first sections 28. Then, the adapter 23 is fixed by rotation in a position in which the projections 26 abut against the ends of the second portions 29.

The housing 5 can be placed on a dispensing gun 30 before or after the insertion of the cartridge 4 and fixation of the adapter 23 ( Fig. 6 ). After opening and removing the clamping device 9 and placing the mixing nozzle as described in connection with the cartridge according to the first embodiment, the cartridge 4 is again ready for use. Because of the effective between the fixing ring 25 and the housing 5 bayonet lock the fixing ring 25 is fixed to the housing 5 and due to the effective between the same and the shell 24 stop this is at most limited displaced forward and forms when triggering the dispensing gun 30 for the pressing the sack 1 required counterpart.

Instead, as described, the adapter may also be integrally formed, but the described embodiment has the advantage that the solid and comparatively massive fixing ring is reusable. The fixation of the adapter on the housing can also be designed differently. The shell or optionally the fixation ring may e.g. a separate or molded skirt which projects beyond the edge of the housing, with two opposing inside grooves or slots, each having a longitudinally extending first portion and a subsequent circumferentially extending second portion and in each case by a protruding when placing the adapter Push button on the outside of the housing, whereupon the adapter is again fixed by twisting. This fixation is also bayonet-like.

Like the housing, the described embodiments of the adapter and the clamping device are preferably made Plastic and can be produced by injection molding.

An integrally formed clamping device 9 according to a second embodiment is shown in FIG Fig. 7-9 shown. It corresponds in its basic structure of the clamping device according to the first embodiment, is also preferably produced by plastic injection molding and can be used in the same way. It also has two clamping parts, each with a half-ring 10a, b, which are connected on one side by a film hinge 31 on. Each of the half-rings 10a, b in turn bears in the vicinity of a front end an inwardly projecting clamping plate 11a; b. The mutually facing, lying in a plane clamping plates 11a, b are of narrow, opposing, substantially parallel wavy, ie, projecting back and forth clamping surfaces 12a, b bounded, which form a narrow, wavy gap-shaped clamping opening 13 in the clamping position. The ring formed by the half-rings 10a, b, in turn, has an internal thread 14, and the first half-ring 10a is provided on a butt surface 15 with two pins 16, which are opposed by corresponding blind holes 17 in an opposite butt surface 18 of the second half-ring 10b.

The securing part is in turn formed as a cap 19 with a round cover 20 and a downwardly projecting circumferential skirt 21, which here, however, has a constant diameter over its length. It is flexibly connected via a band 32 to the edge of the first half-ring 10a. Within the skirt 21 is ( Fig. 9 ) arranged at a distance concentric mounting ring 33, which also starts from the lid 20, but is shorter. On its inside just above its edge is a circumferential groove 34 provided, in which, when the clamping device in the in Fig. 9 illustrated closed position, an outer circumferential bead 35 engages the upper end of the ring formed by the half-rings 10a, b, so that the cap 19 is snap-locked in the closed position on said ring.

The projecting beyond the mounting ring 33 lower part of the skirt 21 in turn forms a retaining ring which concentrically surrounds the ring formed by the half-rings 10a, b in the closed position and the clamping parts in the clamping position holds so that they between the clamping surfaces 12a, b through Front 3 of the (in Fig. 9 not shown) Sackes secure and close. In this position, the clamping device may be screwed onto the socket 6 with external thread 7 at the front end of the housing 5 of a cartridge, as in Fig. 9 represented or on the neck of the plate or shell of an adapter.

To transfer the clamping device 9 into the open position, the cap 19 is first pulled off again, the snap-lock being released between the same and the half-rings 10a, b under slight elastic deformation. Subsequently, the half rings 10a, b can in turn be unfolded and detached from the nozzle 6. They can also be connected so that they automatically unfold and fall off as soon as they are no longer held together by the circlip.

LIST OF REFERENCE NUMBERS

1

bag

2

clip

3

front end

4

cartridge

5

casing

6

Support

7

external thread

8th

Opening

9

clamping device

10a, b

half rings

11a, b

clamps

12a, b

clamping surfaces

13

terminal opening

14

inner thread

15

abutting face

16

spigot

17

blind holes

18

abutting face

19

cap

20

cover

21

apron

22

mixing nozzle

23

adapter

24

Bowl

25

fixing

26

extension

27

slot

28

first section

29

second part

30

dispensing gun

31

film hinge

32

tape

33

fixing ring

34

groove

35

bead

Claims (20)

Clamping device (9) for a sack (1) of flexible material, which encloses at least one chamber filled with a mass, which is connected to a discharge opening located at a front end (3) of the sack (1), which comprises a first clamping part first clamping surface (12a) and a second clamping part with a second clamping surface (12b) and from a closed position, in which the first clamping surface (12a) and the second clamping surface (12b) face each other in a clamping position, so as to interpose between them forming a narrow clamping opening (13) which is suitable for receiving and clamping an end section of the bag (1) adjoining the dispensing opening, for releasing the clamping of the bag (1) into an open position, in which the first clamping surface (12a) and the second clamping surface (12b) are further away from each other, characterized in that it further comprises a securing part with a locking ring, which in the S closing position surrounds the first clamping part and the second clamping part, such that it holds the same in a mutual position in which the first clamping surface (12a) and the second clamping surface (12b) occupy the clamping position and which in order to enable the transfer of the clamping device (9) is removable in the open position. Clamping device (9) according to claim 1, characterized in that the securing part is formed as a one-piece cap (19) which comprises the securing ring. Clamping device according to claim 2, characterized in that the cap (19) comprises a cover (20) and a circumferential skirt (21) adjoining the same, and the securing ring is formed by the skirt (21) or a part thereof. Clamping device (9) according to one of claims 1 to 3, characterized in that the securing part is latched or snap-locked in the closed position with at least one of the clamping parts. Clamping device (9) according to one of claims 1 to 4, characterized in that the first clamping part comprises a first clamping plate (11a) with an exposed edge portion which forms the first clamping surface (12a) and the second clamping part in the closed position against the first Clamping plate (11 a) directed second clamping plate (11 b), also with an exposed edge portion which, the first clamping surface (12 a) opposite, the second clamping surface (12 b) forms. Clamping device (9) according to claim 5, characterized in that the first clamping surface (12a) and the second clamping surface (12b) in the closed position are substantially parallel, such that the clamping opening (13) is slit-shaped. Clamping device (9) according to claim 5 or 6, characterized in that the first clamping surface (12a) and the second clamping surface (12b) are each corrugated. Clamping device (9) according to one of claims 5 to 7, characterized in that the first clamping plate (11a) and the second clamping plate (11b) each level are and lie in the closed position in a common plane. Clamping device (9) according to one of claims 5 to 8, characterized in that the first clamping part comprises a first half-ring (10a), on the inside of which the first clamping plate (11a) is attached and the second clamping part a second half-ring (10b) the inside of which the second clamping plate (11b) is mounted and the first half-ring (10a) and the second half-ring (10b) are held in the closed position by the securing part in a mutual position in which they form a ring. Clamping device (9) according to one of claims 1 to 9, characterized in that the first clamping part and the second clamping part are connected by a hinge and in the closed position also at a location spaced from the hinge by a plug connection. Clamping device (9) according to one of claims 1 to 10, characterized in that the securing part is flexibly connected to at least the first clamping part. Clamping device (9) according to one of claims 9 to 11, characterized in that the ring formed by the first half-ring (10a) and the second half-ring (10b) has an internal thread (14). Adapter (23) with a clamping device (9) according to one of claims 1 to 12, characterized in that it comprises a plate or shell (24) with a central opening at which the clamping device (9) is arranged, which forms on a rear side surrounding the opening abutment surface for at the front end (3) of the same subsequent shoulder of the bag (1). Adapter (26) according to claim 13 with a clamping device (9) according to claim 12, characterized in that the opening of an outwardly facing nozzle (6) on the housing (5) is surrounded, which has an external thread (7) with the internal thread (14) of the ring formed by the first half-ring (10a) and the second half-ring (10b) engages. Adapter (26) according to claim 13 or 14, characterized in that it comprises at least one fixing part for fixing the adapter (23) on a housing (5) with an engagement part which is adapted to engage with a corresponding engagement part on the housing (5) , Adapter (26) according to claim 15, characterized in that the fixing part as a fixing ring (28) is formed with a back, which forms a stop for the plate or shell (24). Cartridge (4) with a clamping device (9) according to one of claims 1 to 12, characterized in that it comprises a cylindrical housing (5) having at one front end an opening (8) on which the clamping device (9) is arranged is and in the housing (5) arranged bag (1) made of flexible material, which encloses at least one filled with a mass chamber, which at a front end (3) of the bag (1) has a discharge opening, wherein an the end portion adjoining the discharge opening projects through the clamping opening (13) so that the sack (1) is clamped there between the first clamping surface (12a) and the second clamping surface (12b) and thereby the at least one chamber is closed behind the discharge opening. Cartridge (4) according to Claim 17, with a clamping device (9) according to Claim 12, characterized in that the opening (8) is arranged at the end of an outwardly pointing connecting piece (6) on the housing (5), which has an external thread (7 ) which engages with the internal thread (14) of the ring formed by the first half-ring (10a) and the second half-ring (10b). Cartridge (4) with an adapter (23) according to one of claims 13 to 16, characterized in that it comprises a bag (1) of flexible material enclosing at least one chamber filled with a mass which is connected to one at the front ( 3) of the bag (1) is connected, wherein a subsequent to the discharge opening portion of the bag (1) through the clamping opening (13) of the clamping device (9) protrudes, so that the bag (1) there between the first clamping surface (12a ) and the second clamping surface (12b) clamped and thereby the at least one chamber is closed behind the discharge opening, while at the front end (3) thereof subsequent shoulder of the bag (1) on the contact surface of the adapter (23). A cartridge (4) according to claim 19, comprising an adapter (26) according to claim 15 or 16, characterized in that it comprises a cylindrical housing surrounding the bag (1) (5) with a through the adapter (23) closed opening, with which the fixing part releasably engages releasably.

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