GB2191428A - Toggle lever workpiece clamping device - Google Patents
Toggle lever workpiece clamping device Download PDFInfo
- Publication number
- GB2191428A GB2191428A GB08709592A GB8709592A GB2191428A GB 2191428 A GB2191428 A GB 2191428A GB 08709592 A GB08709592 A GB 08709592A GB 8709592 A GB8709592 A GB 8709592A GB 2191428 A GB2191428 A GB 2191428A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lever
- clamping
- double
- piston rod
- armed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/12—Arrangements for positively actuating jaws using toggle links
- B25B5/122—Arrangements for positively actuating jaws using toggle links with fluid drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B5/00—Clamps
- B25B5/06—Arrangements for positively actuating jaws
- B25B5/12—Arrangements for positively actuating jaws using toggle links
Abstract
A pressure-medium actuated toggle-lever clamping device for clamping workpieces has a manually operable double-armed lever 1 which is coupled to the piston rod 3 of a double-acting clamping cylinder and has a handle 10 mounted thereon for limited pivotal movement between abutments 15, 16. A multi-way control valve 25 communicates with the piston rod chamber 33 of the clamping cylinder through a venting valve 17 which is actuated by an arm 14 on the handle 10 to connect the chamber 33 to an open vent 23 to allow manual pre-clamping and adjustment of the workpiece. The piston 21 is mounted on the piston rod 3 with provision for lost motion so that when the clamping chamber 34 of the cylinder is pressurised to close clamping jaws 8,9, the piston 21 acts on the valve 17 to restore communication between the control valve 25 and the chamber 33. <IMAGE>
Description
SPECIFICATION
Toggle-lever clamping device
This invention relates to a pressure-medium actuated toggle-lever clamping device, with manual operation also whereby the device can be released for adjusting pieces manually.
Toggle-lever clamping devices with a manual operation facility are used, for instance, in car body construction in welding plants in order to insert additional pieces by hand into automatically controlled toggle-lever clamping devices and preclamp them manually. As soon as these pieces to be clamped have been positioned in the manually operated toggle-lever clamping devices, pressure is applied to all of the toggle-lever clamping devices, including automatic ones, in order to lock them.
Known toggle-lever clamping devices already have a hand lever connected to the togglelever which is inevitably shifted in the opening and closing movements of the toggle-lever clamping device, thus posing a danger to operating personnel. If these toggle-lever clamping devices are preloaded manually and pressure, particularly in the form of pressurized air, is subsequently applied to all of the togglelever clamping devices, the hand levers are thereby kicked back, which can cause serious injury to operating personnel.
Toggle-lever devices are usually set up in series and controlled by means of 5/2 directional control valves, and in the position "clamp open" the annular space of the cylinder is under constant air pressure.
In order to control these known toggle-lever clamping devices with a manual operation facility, 5/3 directional control valves are necessary with which both valves of the cylinder chamber are rendered pressureless in the central position. This means that there is no signal for the subsequent switching or electrical interrogation "open" and "closed" if controls operate on the basis of pneumatic interrogation. In order to employ manually operated and automatic toggle-lever clamping devices in a single system-as is usual and necessary-complex air control circuits and additional valves are therefore required. This demands high investment costs, as one cannot know at the outset, during installation of the system, where manual pre-clamping, i.e. toggle-lever clamping devices with manual operation facility, and where automatic toggle-lever clamping devices are to be used.On this account, bearing in mind the state of the art, all togglelever clamping devices would have to be fitted with expensive 5/3 directional control valves in order to obtain the necessary flexibility in use.
In German patent application P 35 13 680.415 which was not published as of the priority date of this application, there is disclosed a pressuremedium actuated toggle-lever clamping device for clamping workpieces, primarily for use in jigs and welding machines, with a manually operable, double-armed hand lever with a handle attached to it and which acts upon the piston rod of a dualaction clamping cylinder, wherein the double-action hand lever is attached by means of a swivel joint to the piston rod and the lever arm opposite the handle of the double-armed hand lever is connected by means of a pivot joint to a clamping element, and a multi-way valve is assigned to the piston rod side of the end face of the clamping cylinder, the valve monitoring the return stroke chamber of the clamping cylinder and being linked to a non-return valve whose air-release position for the return stroke chamber is controllable via an air release line, the line leading into the open and being monitored by the non-return valve, by means of an adjusting element attached to the hand lever end of the double-armed hand lever, wherein the closed position of the nonreturn valve for the air-release line is effected by means of a clamping piston, which is connected to the piston rod in a trailing arrangement, during its longitudinal movement independently of the piston rod, there being a clamping link attached to the toggle-lever joint, the clamping link being connected on one side to the clamping element via a swivel joint and on the side to the piston rod via another swivel joint positioned parallel to it.This togglelever clamping device features a shut-off mechanism which can be set either in air-release position to release air from the space in the cylinder occupied by the cylinder rod (annular space) by manual operation or into a shut-off position by the piston itself if the cylinder space opposite the annular space has full pressure, pressurized air in particular, applied to it during automatic clamping.
This can be simply effected without any external design modification by fitting a shut-off gate or valve which through manual operation releases air from the annular space of the toggle-lever clamping device and simultaneously shuts off the pressure medium supply on the annular side.
The hand lever can now be shifted in the clamping position and brought back into its initial position where it engages without being impeded by the pressure currently applied by the pressure medium.
As the annular space of the toggle-lever clamping device is under pressure in the opened position, a signal can also be interrogated.
Because the hand lever engages in its intitial position, there is no danger to operating personnel when the toggle-lever clamping device is automatically controlled. It is no longer possible for the hand lever to kick back and forth on a toggle-lever clamping device designed accordingly.
Due to the hand lever engaging, it is also possible to install the clamp in any desired position. Furthermore, the application of the shut-off mechanism allows operation with oilfree air.
The invention is based on the problem of designing a pressure-medium actuated togglelever clamping device of the above general type in such a way that the position of manually pre-clamped pieces can be corrected.
Accordingly, the invention provides a pressure-medium actuated toggle-lever clamping device for clamping workpieces, with a manually operable, double-armed hand lever with a handle attached to it and which acts upon the piston rod of a dual-action clamping cylinder, wherein the double-armed hand lever is attached by means of a swivel joint to the piston rod and the lever arm opposite the handle of the double-armed hand lever is connected by means of a pivot joint to a clamping element, and a multi-way valve is assigned to the piston rod side of the end face of the clamping cylinder, the valve monitoring the return stroke chamber of the clamping cylinder and being linked to a non-return valve whose air-release position for the return stroke cylinder chamber is controllable via an air release line, the line leading into the open and being monitored by the non-return valve, by means of an adjusting element attached to the hand lever end of the double-armed hand lever, wherein the closed position of the non-return valve for the air-release line is effected by means of a clamping piston, which is connected to the piston rod in a trailing arrangement, during its longitudinal movement independently of the piston rod, there being a clamping link attached to the toggle-lever joint, the clamping link being connected on one side to the clamping element via a pivotal joint and on the other side to the piston rod via another pivotal joint positioned parallel to it, wherein the double-armed hand lever is also positioned pivotally on the joint connecting the clamping link to the piston rod, the handle has a double-armed lever positioned pivotally on the double-armed hand lever mounted on a pivotal joint located parallel to the pivotal joints of the toggle-lever joint, whereby the double-armed lever is able to pivot between at least two limit stops provided on the doublearmed hand lever, and the lever arm opposite the handle on the double-armed lever constitutes the adjusting element.
In contrast to the device of German patent application P 35 13 680.4, the toggle-lever mechanism of the toggle-lever clamping device according to the present invention can be opened and closed manually. This enables the position of pieces preclamped manually to be corrected. This is made possible by, amongst other things, the pressure release in the annular space (return stroke chamber) and the mechanical connection of the double-armed hand lever to the toggle-lever joint. The doublearmed lever featuring the handle forms a double-lever together with the double-armed hand lever. The double-lever moves in the same direction during clamping and first opens the valve for pressure release of the return stroke chamber (annular space) and then the closure movement of the toggle lever clamping device is effected after the limit stop within the large double-armed hand lever is reached.
For reference purposes, mention is made of
DE-PS 708439, DE-PS 550737, DE-GM 8307606 and DEGM 191725.
An embodiment of the invention will now be described by way of example and with reference the the accompanying, partially schematic, drawings in which:
Fig. 1 Shows a toggle-lever clamping device in accordance the invention, part being shown in longitudinal section, part in elevation, and part as a circuit diagram, whereby the return stroke chamber is depicted shut off to the outside and the clamping jaws of the togglelever clamping device are depicted open;
Fig. 2 Shows the same toggle-lever clamping device as in Fig. 1, wherein the jaws of the toggle-lever clamping device are depicted closed due to application of compressed air;
Fig. 3 Shows the same toggle-lever clamping device, wherein for reasons of simplicity the multi-way valve has been omitted and the return stroke chamber is depicted free of compressed air and the clamping jaws are depicted open;;
Fig. 4 Shows the same toggle-lever clamping device, wherein the clamping jaws are depicted manually pre-clamped, and
Fig. 5 Shows the same toggle-lever clamping device with the handle pivoted forward compared to Fig.4.
The drawings depict an embodiment of the invention in its application on a toggle-lever clamping device which could prove especially beneficial to car body construction in the automobile industry. In the drawings, all of the parts which are not essential to understanding the principle behind the invention have been omitted as they can be assumed to have a conventional design since the idea behind the invention is in principle applicable to all togglelever constructions. Many of the design details described below for the realization of the embodiment are so simple that they do not necessitate any fundamental modification of known toggle-lever clamping devices with manual operation facility.
Reference No. 1 designates a double-armed hand lever which is attached by means of a swivel joint 2 to a piston rod 3. The lever arms of the double-armed hand lever are numbered 4 and 5 respectively.
The lever arm 5 of the double-armed hand lever 1 is connected by means of a pivot joint 6 to a clamping element 7 which is in turn attached to a clamping jaw 8 which acts in combined operation with a clamping jaw or abutment 9. An undepicted workpiece, a car body part for instance, can be gripped between clamping jaws 8 and 9.
The double-armed hand lever 1 has a handle 10 assigned to which has limited pivotal movement as described below; the handle 10 is connected as one piece to a double-armed lever 11 which is pivotally mounted on a swivel joint 12 on the lever arm 4. The doublearmed lever 11 has lever arms 13 and 14.
Reference nos. 15 and 16 designate limit stops which limit the pivotal movement of the handle 10 and thus that of -the double-armed lever 11 in directions X or Y relative to the double-armed hand lever 1. The lever arm 14 constitutes an adjusting element for a nonreturn valve 17 which is designed as a piston valve and is located in a drilled hole in the end face 18 on the piston rod side with limited longitudinal displacement in directions A or B. The external surface of the non-return valve 17 is sealed against pressure-medium with undepicted seal elements. In the illustrated form, the non-return valve 17 is cylindrical in cross-section and features a collarshaped limit stop at each end 19 and 20 with a larger diameter.The adjusting element 1 is able to act upon limit stop 19 while a clamping piston 21 is able to act upon limit stop 20 after corresponding displacement in direction
A, thereby pushing back the non-return valve 17 in the same direction.
Two raceways 22 and 23 open have openings in end face 18 and are positioned parallel to one another and at a distance apart running radially to the longitudinal axis of the piston rod 3, raceway 23 serving as an air-release line. Raceway 22 has a line 24 (Figs. 1 and 2) attached to it which leads to a multi-way valve, in particular to a 5/2 valve 25, which is connectable to a compressed air line 26.
The non-return valve 17 features a raceway 27 running along part of its axial length which by means of a radial section 28 can be connected either to raceway 22 (Figs 1 and 2) or to raceway 23 (Figs. 3 to 5) depending on the axial position of the piston valve-type nonreturn valve 17.
The free end of the piston rod 3 has a reduced diameter at section 29, thus producing two stop shoulders 30 and 31 positioned parallel to one another and at a distance apart between which the clamping piston 21 is free to slide. The clamping piston 21 is sealed in the usual manner at the side face 32 of the return stroke chamber 33 and the pressurized cylinder chamber 34 by undepicted seal elements. This produces the trailing arrangement of the clamping piston 21 with the piston rod 3.
The length of section 29 with reduced diameer is designated by leter L. The length L is greater than the axial stroke of the clamping piston 21 in direction A when the hand lever 1 is pivoted in direction X.
The design version iilustrated in the drawings functions as follows:
With the respective positions of the parts in
Fig. 1, the lever arm 14 rests against the limit stop 16 of hand lever 1 whereby the hand lever 1 and the handle 10 are at their extreme position pivoted in direction Y. The non-return valve 17 rests with its limit stop 20 against the end face 18 in such a manner that raceway 27 is connected to line 24 via the radial section 28 and to the compressed air line 26 via the 5/2 multi-way valve, with the result that the return stroke chamber 33 is under pressure from compressed air and the clamping piston 21 has been shifted in direction B against the stop shoulder 31. Clamping element 7 has been pivoted around the stationary pivot joint 6 and the toggle-lever joint in such a manner that the clamping jaw 8 is in its open position.
With the respective positions of the parts in
Fig., 2, the compressed air line 26 has been connected to a line 35 via the multi-way valve 25 and thus to the pressurized cylinder chamber 34 via a feed line 236, with the result that the clamping piston 21 has been shifted in direction A against the stop shoulder 30.
Via the piston rod 3, the toggle-lever joint has been pivoted around the stationary pivot joint 6 such that the clamping element 7 has been pivoted via a clamping link 37 with the swivel joint 38 causing the clamping jaw 8 to close against abutment 9. As one can see from the drawing, the clamping link 37 is mounted with the hand lever 1 on the toggle-lever joint. The lever arm 13 rests against the limit stop 15 of the hand lever 1.
With the respective positions of the parts in
Fig. 3, the non-return valve 17 has been displaced to its extreme position in direction B so that its limit stop 19 rests against the end face 18 and is connected via raceway 23 and radial section 28 of the return stroke chamber 33 to the external atmosphere, i.e. the compressed air has been released. The lever arm 13 rests against the limit stop 15 while lever arm 14 with its front crowned or rounded section rests against the end face of the nonreturn valve 17. With this configuration of parts, the clamping jaw 8 is open.
With the respective positions of the parts in
Fig. 4, the double-armed lever 11 has been pivoted by the handle 10 around the swivel joint 12 to the extent that the lever arm 13 rests against limit stop 15, as a result of which force is transmitted further by the double-armed hand lever 1 such that with further pivoting in direction X via swivel joint 2, the piston rod 3 and, via the stop shoulder 31, the clamping piston 21 have been displaced in the process. With the respective positions of the parts illustrated in Fig. 4, the clamping jaw 8 has been shifted against the abutment 9 by hand with a certain degree of force so that the undepicted workpieces are manually pee clamped. The return stroke chamber 33 is still connected to the external atmosphere via the radial section 28 and via the raceway 23, i.e.
the compressed air has been released, with the result that the positional correction of pieces can be carried out with-out resistance from forces other than frictional forces.
One can see from Fig. 5 that for the purposes of adjusting manually pre-clamped pieces, for instance if pieces have been incorrectly positioned and have to be shifted into their correct position, the handle 10 can be pivoted around swivel joint 12 so that the double-armed lever 11 is pivoted around swivel joint 12 until the lever arm 14 rests against limit stop 16, thus allowing the hand lever 1 to be pivoted around pivot joint 6 in direction Y such that the clamping element 7 is shifted by the toggle-lever joint thus moving clamping jaw 8 into an open position, with simultaneous axial diaplacement of the piston rod 3 in direction B whereby the clamping piston 21 is trailed after an initial position adjustment relative to the piston rod 3. The pieces can subsequently be manually preclamped, as was described in connection with
Fig. 4.
Subsequent control or similar action then feeds compressed air via the 5/2 multi-way valve 25 through the line 35 and the feed raceway 36 to the pressurized cylinder chamber 34, as a consequence of which the nonreturn valve 17 is displaced in direction A by the clamping piston 21 such that the return stroke chamber 33 is sealed off to the external atmosphere. This produces the configuration of parts to be seen in Fig.2.
With the design of the double-armed hand lever 1 according to the invention combined with the toggle-lever mechanism, the togglelever clamping device can thus be opened and closed. This is made possible by the pressure release in the return stroke cylinder chamber 33 (annular space) and by the mechanical connection of the large, doublearmed hand lever 1 to the toggle-lever joint. The double-lever moves during clamping in the same direction and first opens the valve 17 for pressure release and then the closure movement of the clamp is effected after the limit stop within the large hand lever 1 has been reached.
Claims (2)
1. A pressure-medium actuated toggle-lever clamping device for clamping workpieces, with a manually operable, double-armed hand lever with a handle attached to it and which acts upon the piston rod of a dual-action clamping cylinder, wherein the double-armed hand lever is attached by means of a swivel joint to the piston rod and the lever arm opposite the handle of the double-armed hand lever is connected by means of a pivot joint to a clamping eiement, and a multi-way valve is assigned to the piston rod side of the end face of the clamping cylinder, the valve monitoring the return stroke chamber of the clamping cylinder and being linked to a non-return valve whose air-release position for the return stroke cylinder chamber is controllable via an air release line, the line leading into the open and being monitored by the non-return valve, by means of an adjusting element attached to the hand lever end of the double-armed hand lever, wherein the closed position of the non-return valve for the air-release line is effected by means of a clamping piston, which is connected to the piston rod in a trailing arrangement, during its longitudinal movement independently of the piston rod, there being a clamping link attached to the toggle-lever joint, the clamping link being connected on one side to the clamping element via a pivotal joint and on the other side to the piston rod via another pivotal joint positioned parallel to it, wherein the double-armed hand lever is also positioned pivotally on the joint connecting the clamping link to the piston rod, the handle has a double-armed lever positioned pivotally on the double-armed hand lever mounted on a pivotal joint located parallel to the pivotal joints of the toggle-lever joint, whereby the double-armed lever is able to pivot between at least two limit stops provided on the doublearmed hand lever, and the lever arm opposite the handle on the double-armed lever constitutes the adjusting element.
2. A toggle lever clamping device substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863613852 DE3613852C1 (en) | 1986-04-24 | 1986-04-24 | Hydraulic-operated toggle clamp device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8709592D0 GB8709592D0 (en) | 1987-05-28 |
| GB2191428A true GB2191428A (en) | 1987-12-16 |
| GB2191428B GB2191428B (en) | 1989-12-28 |
Family
ID=6299420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8709592A Expired GB2191428B (en) | 1986-04-24 | 1987-04-23 | Toggle-lever clamping device |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3613852C1 (en) |
| GB (1) | GB2191428B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5823519A (en) * | 1995-10-19 | 1998-10-20 | Tunkers Maschinenbau Gmbh | Toggle lever clamp |
| US5853211A (en) * | 1997-01-10 | 1998-12-29 | Btm Corporation | Universal gripper |
| WO1999043471A1 (en) * | 1998-02-28 | 1999-09-02 | Thyssen Krupp Industries Ag | Device for clamping especially body panels during car manufacture |
| US6115898A (en) * | 1995-06-06 | 2000-09-12 | Btm Corporation | Force multiplying apparatus for clamping a workpiece and forming a joint therein |
| FR2804354A1 (en) * | 2000-01-31 | 2001-08-03 | Dubuis Et Cie M | TIGHTENING TOOL AND PARTICULARLY CRIMPING |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9208306U1 (en) * | 1992-06-22 | 1993-10-21 | Sta Co Mettallerzeugnisse Gmbh | Jig |
| DE19530066A1 (en) * | 1995-08-16 | 1997-02-20 | Sta Co Mettallerzeugnisse Gmbh | Interchangeable jig kit |
| DE19645778C2 (en) * | 1996-11-07 | 1999-07-08 | Sta Co Mettallerzeugnisse Gmbh | Toggle clamp device |
| DE10124063A1 (en) * | 2001-05-16 | 2002-11-28 | Sta Co Mettallerzeugnisse Gmbh | Clamping device for mutual clamping, in particular of body parts to be welded by laser |
| CN105058270B (en) * | 2015-08-10 | 2017-03-22 | 苏州赛腾精密电子股份有限公司 | Product pressing mechanism module |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8307606U1 (en) * | 1983-08-04 | De-Sta-Co Metallerzeugnisse Gmbh, 6000 Frankfurt | Toggle clamping device | |
| DE550737C (en) * | 1929-10-27 | 1932-05-19 | Daimler Benz Akt Ges | Device for attaching cloth, leather, artificial leather or the like on wooden parts in furniture, in bodywork etc. |
| DE708439C (en) * | 1939-11-15 | 1941-07-21 | Gerhard Fieseler | Compressed air clamp |
| DE1917295A1 (en) * | 1969-04-03 | 1970-10-22 | Automotive Prod Co Ltd | Hatch cover |
| DE3513680A1 (en) * | 1985-04-16 | 1986-10-30 | Josef Gerhard 4030 Ratingen Tünkers | Toggle-lever clamping appliance with manual adjusting device, in particular for use in coachbuilding |
-
1986
- 1986-04-24 DE DE19863613852 patent/DE3613852C1/en not_active Expired
-
1987
- 1987-04-23 GB GB8709592A patent/GB2191428B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6115898A (en) * | 1995-06-06 | 2000-09-12 | Btm Corporation | Force multiplying apparatus for clamping a workpiece and forming a joint therein |
| US5823519A (en) * | 1995-10-19 | 1998-10-20 | Tunkers Maschinenbau Gmbh | Toggle lever clamp |
| US5853211A (en) * | 1997-01-10 | 1998-12-29 | Btm Corporation | Universal gripper |
| US5938259A (en) * | 1997-01-10 | 1999-08-17 | Btm Corporation | Pad for universal gripper |
| WO1999043471A1 (en) * | 1998-02-28 | 1999-09-02 | Thyssen Krupp Industries Ag | Device for clamping especially body panels during car manufacture |
| FR2804354A1 (en) * | 2000-01-31 | 2001-08-03 | Dubuis Et Cie M | TIGHTENING TOOL AND PARTICULARLY CRIMPING |
| EP1122031A1 (en) * | 2000-01-31 | 2001-08-08 | M. Dubuis et Compagnie | Clamping tool and especially crimping tool |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2191428B (en) | 1989-12-28 |
| GB8709592D0 (en) | 1987-05-28 |
| DE3613852C1 (en) | 1987-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |