AU2010360812A1

AU2010360812A1 - Clamping tool and method of dismounting or mounting a jaw or a jaw support

Info

Publication number: AU2010360812A1
Application number: AU2010360812A
Authority: AU
Inventors: Jonas Dolk; Hans Himbert; Conny Jansson
Original assignee: Kapman AB
Current assignee: Kapman AB
Priority date: 2010-09-13
Filing date: 2010-09-13
Publication date: 2013-05-09
Anticipated expiration: 2030-09-13
Also published as: SE536955C2; SE1350459A1; WO2012036596A1; NO20130492A1; TWI504488B; TW201210755A; AU2010360812B2

Abstract

The present invention relates to a clamping tool, comprising at least one substantially stationary jaw (1), at least one movable jaw (3), at least one sliding rod (5), at least one actuating shank (6) and at least one substantially stationary shank (9). Said at least one movable jaw (3) is movable in relation to said at least one stationary jaw (1) substantially opposite to said at least one stationary jaw (1), said at least one movable jaw (3) being connected to said at least one sliding rod (5), said at least one sliding rod (5) being connected to at least one mechanism (7, 8, 14, 19, 20) for pushing and/or pulling. The present invention also relates to a method of dismounting a jaw and/or a support supporting such a jaw on a clamping tool as well as a method of mounting a jaw and/or a support supporting such a jaw on a clamping tool.

Description

WO 2012/036596 PCT/SE2010/050973 Clamping tool and method of dismounting or mounting a jaw or a jaw support 5 The present invention relates to a clamping tool, comprising at least one substantially stationary jaw, at least one movable jaw, at least one sliding rod, at least one actuating shank and at least one substantially stationary shank. The present invention also relates toa method of dismounting a jaw and/or a support 10 supporting such a jaw on a clamping tool as well as a method of mounting a jaw and/or a support supporting such a jaw on a clamping tool. Prior art An existing clamping tool comprises stationary support, movable support, 15 sliding rod and actuating shank, is equipped with entrainment plates and actuating plates for regulating the sliding rod, the actuating shank acting on the actuating plates to displace the sliding rod penetrating and attached to the stationary support, which shifts the distance between the stationary support and the movable support leading to a clamping effect. However, it is hard to meet the requirements 20 that the sliding rod needs to be displaced over a larger distance in the unloaded mode, while a stronger clamping force needs to be acquired in the pressure mode, since the actuating shank of the existing clamping tool is often connected to the stationary support by means of a swivel pin, which leads to similar strengths of feed pressure and clamping force generated by the sliding rod each time the 25 actuating shank is clasped. In addition, the movable support of the existing clamping tool is often immobilized on the sliding rod, the positional relationship between the movable support and the stationary support is invariable, whereby the clamping tool has only the function of either clamping or supporting. Although the movable support 30 can be flexibly connected to the sliding in order to render the clamping tool both functions of clamping and supporting, the existing connection means can hardly assure enough connecting strength between the movable support and the sliding rod, or enough clamping force, or convenient disassembly and assembly.

WO 2012/036596 PCT/SE2010/050973 2 Moreover, the sliding rod is locked by the entrainment plates when the clamping tool clamps a work-piece by means of the stationary support and the movable support. The locking of the sliding rod by the entrainment plates needs to be lifted when unloading the work-piece. The prior art often utilizes accessory tools 5 other than the clamping tool for prying up the entrainment plates, which is inconvenient and laborious. Summary of the invention A first object of the invention is to provide a clamping tool wherein a sliding 10 rod can be displaced over a larger distance per stroke in the unloaded mode than in the loaded/pressure mode. A second object of the invention is to provide a clamping tool wherein a stronger clamping force can be acquired in the loaded/pressure mode than in the unloaded mode. A third object of the invention is to render a clamping tool the function of convenient disassembly and assembly in 15 order to enable rapid positional shifts of a movable support in the two end portions of a sliding rod, whereby the clamping tool can have both functions of clamping and supporting. A forth object of the invention is to render the clamping tool the function of convenient unloading and effort-saving in the pressure mode. A fifth object of the invention is to provide a clamping tool comprising at least one further 20 device for increasing a clamping force. A sixth object of the invention is to provide a method of dismounting a jaw and/or a support supporting such a jaw on a clamping tool. A seventh object of the invention is to provide a method of mounting a jaw and/or a support supporting such a jaw on a clamping tool. Thus the invention comprises a clamping tool, comprising at least one 25 substantially stationary jaw, at least one movable jaw, at least one sliding rod, at least one actuating shank and at least one substantially stationary shank. Said at least one movable jaw is movable in relation to said at least one stationary jaw substantially opposite to said at least one stationary jaw, said at least one movable jaw being connected to said at least one sliding rod, said at least one sliding rod 30 being connected to at least one mechanism for pushing and/or pulling. Said mechanism may comprise actuating plates for regulating said sliding rod, said actuating shank comprising an actuating point for pushing said actuating plates, a first support point distal to said actuating point and a second support point proximal to said actuating point. Said first support point may have a first axis WO 2012/036596 PCT/SE2010/050973 3 of rotation and said second support point may have a second axis of rotation, said axes of rotation being substantially at right angles with a main extension of said actuating shank as well as a main extension of said sliding rod. Said substantially stationary jaw may have a substantially stationary support and said movable jaw 5 may have a movable support, said sliding rod penetrating and being attached to said stationary support, said mechanism comprising entrainment plates for regulating said sliding rod, said movable support being mounted in one end portion of said sliding rod. Said stationary support may comprise said stationary shank extending towards an end contrary to said stationary jaw, said stationary support 10 comprising a pivot point for engagement, said actuating shank and said stationary shank being oriented opposite to each other. Said first support point may be connected to said stationary support and/or to said stationary jaw and by means of a spring element, said second support point and said pivot point for engagement being oriented substantially opposite to each other 15 for letting the actuating shank turn around said first axis of rotation of the first support point while the second support point detaches from the pivot point for engagement under the effect of the spring element when a clasping force is executed upon said actuating shank and said stationary shank and when there is no workpiece to clamp by said stationary jaw and said movable jaw and the jaws 20 are not clamping each other, whereas the pivot point for engagement is engaged by the second support point, and the actuating shank turnes around said second axis of rotation of the second support point when a clasping force is executed upon said actuating shank and said stationary shank and when a workpiece is held and/or clamped by said stationary jaw and said movable jaw or the jaws are 25 clamping each other, leading to a longer moving distance for the actuating plates and the sliding rod in the unloaded mode each time the shanks are being clasped than in the pressure mode. Said spring element connecting said first support point with said stationary support may be a torsion spring, the torsion spring being installed in said stationary support by means of a swivel point, the two ends of the 30 torsion spring being respectively attached to said first support point and said stationary support. Said pivot point for engagement may be arc-shaped. Said second support point may be arc-shaped. Said actuating shank may comprise a bore, said sliding rod penetrating said bore. There may be at least one locking spring element acting on WO 2012/036596 PCT/SE2010/050973 4 said entrainment plates. There may be at least one return spring element acting on said actuating plates. Said entrainment plates and said actuating plates may enwrap said sliding rod. Said at least one locking spring element may be at least one helical spring enwrapping said sliding rod. Said at least one return spring 5 element may be at least one helical spring enwrapping said sliding rod. There may be at least one positioning groove installed in at least one of the two end portions of said sliding rod, said movable support and/or said movable jaw comprising a movable block body enwrapping said sliding rod, said movable support and/or said movable jaw being connected to said movable block body by 10 means of a swivel pin, there being a locking pin installed on said movable support and/or said movable jaw, a spring element connecting said movable support and/or said movable jaw with said movable block body inserting said locking pin into a corresponding positioning groove, the elasticity of said spring element applied on said movable support and/or said movable jaw having the same 15 direction as the force applied on the movable support and/or the movable jaw in the pressure mode. Said movable block body may comprise a bore point, said movable support comprising a compression point extending to said bore point. The clamping tool may comprise at least one release shank for at least partly releasing said sliding rod from said mechanism. Said stationary support may be connected 20 to a release shank opposite to said stationary shank, said release shank comprising a release point for pushing said entrainment plates. Said release shank may be installed between said stationary shank and said actuating shank, and may be connected to said stationary support by means of a swivel pin. The clamping tool may comprise at least one further device for increasing 25 a clamping force. Said at least one further device may be at least one lever. Said at least one lever may be turnable around at least one third axis of rotation which is substantially at right angles with a main extension of said actuating shank as well as a main extension of said sliding rod, said lever being eccentrically formed in relation to said axis. Said at least one further device may be mounted on at least 30 one of said at least one stationary jaw and/or said at least one stationary support and/or said at least one movable jaw and/or said at least one movable support for pressing two parts of the tool apart leading to said increasing of said clamping force in the pressure mode.

WO 2012/036596 PCT/SE2010/050973 5 Thus the invention also comprises a method of dismounting a jaw and/or a support supporting such a jaw on a clamping tool according to the above, the method comprising the steps of - pressing a compression point on said support or jaw to overcome the elasticity of 5 a spring element which connects said support or jaw with a block body which enwrapps a sliding rod, - turning the support or jaw around an axis of rotation such that a locking element which is installed on the support or jaw falls out of a positioning element of said sliding rod and 10 - removing the support or jaw from said sliding rod. Thus the invention also comprises a method of mounting a jaw and/or a support supporting such a jaw on a clamping tool according to the above, the method comprising the steps of - putting the support or jaw on an end of a sliding rod letting said sliding rod 15 penetrate the support or jaw as much as possible, - pressing a compression point on said support or jaw to overcome the elasticity of a spring element which connects said support or jaw with a block body which enwrapps said sliding rod, - turning the support or jaw around an axis of rotation such that a locking element 20 which is installed on the support or jaw opens up for said sliding rod to further penetrate the support or jaw and - letting said sliding rod penetrate the support or jaw until said locking element falls into a positioning element of said sliding rod. Said locking element may be a locking pin (26). Said positioning element may be a 25 positioning groove. List of drawings Figure 1 shows, in a side view and partly cut, a first embodiment of a clamping tool according to the invention. 30 Figure 2 shows, in a side view and partly cut, the clamping tool according to figure 1 when an actuating shank is clasped in an unloaded mode. Figure 3 shows, in a side view and partly cut, the clamping tool according to figure 1 when the actuating shank is clasped in a loaded/pressure mode.

WO 2012/036596 PCT/SE2010/050973 6 Figure 4 shows, in a side view and partly cut, the clamping tool according to figure 1 when a movable support is mounted in the other end portion of a sliding rod. Figure 5 shows, in a side view, a second embodiment of a clamping tool 5 according to the invention when a lever is not turned at all. Figure 6 shows, in a side view, the clamping tool according to figure 5 when the lever is turned substantially half way. Figure 7 shows, in a side view, the clamping tool according to figure 5 when the lever is turned substantially all the way. 10 Description of embodiments As shown in figure 1, the clamping tool of the invention comprises a stationary support 2 with a stationary jaw 1, a movable support 4 with a movable jaw 3, a sliding rod 5, an actuating shank 6, wherein said sliding rod 5 penetrates 15 and is attached to said stationary support 2 equipped with entrainment plates 7 and actuating plates 8 for regulating the sliding rod 5, said movable support 4 being mounted in one end portion of said sliding rod 5, and said stationary jaw 1 and said movable jaw 3 being oriented opposite to each other. Said stationary support 2 comprises a stationary shank 9 extending towards the end contrary to 20 said stationary jaw 1, a pivot point for engagement 10, said actuating shank 6 and said stationary shank 9 being oriented opposite to each other, said actuating shank 6 comprising an actuating point 11 for pushing said actuating plates 8, a first support point 12 distal to said actuating point 11 and a second support point 13 proximal to said actuating point 11, said first support point 12 being connected 25 to said stationary support 2 by means of a spring element 14, said second support point 13 and said pivot point for engagement 10 being oriented opposite to each other. In order to minimize damage to the surface of a workpiece, the touching points of the stationary jaw 1 and the movable jaw 3 with the clasped workpiece 30 can be made of elastic material (e.g. rubber). In order to assure strength and stiffness, the sliding rod can be sustained by metallic material, while the stationary support 2, the movable support 4 and the actuating shank 6 can be made of plastics.

WO 2012/036596 PCT/SE2010/050973 7 The clamping tool can have different functions depending on the different distances from the first support point 12 or the second support point 13 to the actuating point 11: As shown in figure 2, there is no workpiece to clamp by the stationary 5 support 2 and the movable support 4 in the unloaded mode. When the stationary shank 9 and the actuating shank 6 are clasped, the actuating shank 6 moves around the axis of the first support point 12 while the second support point 13 detaches from the pivot point for engagement 10 under the effect of the spring element 14. Regarding the actuating shank 6 as a lever, the ratio between the 10 effort arm LI when the actuating shank is clasped (i.e. the distance between the clasping point and the first support point 12) and the resistance arm L2 (i.e. the distance between the actuating point 11 and the first support point 12) is relatively small, since the first support point 12 is relatively distant from the actuating point 11. The actuating plates 8 displaces the sliding rod 5 over a relatively large 15 distance D1 rightwards each time the actuating shank 6 is clasped. The actuating point 11 acquires a relatively weak pushing force leading to rapid advancing of the sliding rod rightwards which is actuated by the actuating plates. Clasping is more effort-saving in the unloaded mode, which is particularly suitable for the operator with the other hand unable to assist. 20 As shown in figure 3, the stationary support 2 and the movable support 4 hold and intend to further clamp the workpiece 35. When the stationary shank 9 and the actuating shank 6 are clasped, the spring element 14 is deformed under the pressure of the clasping force. The pivot point for engagement is engaged by the second support point 13, and the actuating shank 6 moves around the axis of 25 the second support point 13. Similarly, regarding the actuating shank 6 as a lever, the ratio between the effort arm L3 when the actuating shank 6 is clasped (i.e. the distance between the clasping point and the second support point 13) and the resistance arm L4 (i.e. the distance between the actuating point 11 and the second support point 13) is relatively large, since the second support point 13 is relatively 30 close to the actuating point 11. The actuating plates 8 displaces the sliding rod 5 over a relatively small distance D2 (D2<D1) rightwards each time the actuating shank 6 is clasped. The actuating point 11 acquires a relatively strong pushing force leading to slow advancing of the sliding rod 5 rightwards which is actuated by the actuating plates 8.

WO 2012/036596 PCT/SE2010/050973 8 In practice, the work status of the first support point 12 and that of the second support point 13 are automatically shifted during the process when the stationary support 2 and the movable support 4 hold and intend to further clamp the workpiece 35. 5 In order to further improve and supplement the technical embodiments described above, the invention also includes the following additional technical features that can be selectively applied depending on the required functions: The spring element 14 connecting the first support point 12 to the stationary support 2 is a torsion spring, the torsion spring is installed in the 10 stationary support 2 by means of a swivel point 15, and the two ends of the torsion spring are respectively attached to the first support point 12 and the stationary support 2. In this construction the torsion spring is installed in the stationary jaw 1 making the construction compact and easy to assemble. In order to install the torsion spring a first cavity 16 is introduced in the stationary jaw 1. The first 15 support point 12 and the torsion spring are installed in the first cavity 16 which is covered by a first cover plate 17 connected to the stationary jaw 1 by means of screws. The pivot point for engagement 10 and the second support point 13 are arc-shaped. This feature restricts the movement around the axis of the second 20 support point 13 within the pivot point for engagement 10. This feature also restores the second support point 13 to the default position after its detachment from the pivot point for engagement 10. The actuating shank 6 comprises a bore 18, the sliding rod 5 penetrating and being attached to the bore 18; there being a locking spring element 19 acting 25 on the entrainment plates 7, a return spring element 20 acting on the actuating plates 8; the entrainment plates 7 and the actuating plates 8 enwrapping the sliding rod 5, the locking spring element 19 and the return spring element 20 being helical springs enwrapping the sliding rod 5. In this construction the entrainment plates 7, the actuating plates 8, the locking spring element 19 and the return 30 spring element 20 are retrained to the work status by the sliding rod 5. A second cavity 21 is introduced in the stationary support 2. The entrainment plates 7, the actuating plates 8, the locking spring element 19 and the return spring element 20 are installed in the second cavity 21 which is covered by a second cover plate 22 connected to the stationary support 2 by means of screws. The second cavity and WO 2012/036596 PCT/SE2010/050973 9 the first cavity are connected such that the first support point of the actuating shank extends to the stationary jaw. There are positioning grooves 23A, 23B installed in the two end portions of the sliding rod 5, the movable support 4 comprises a movable block body 24 5 enwrapping the sliding rod 5, the movable jaw 3 being connected to the movable block body 24 by means of a swivel pin 25 such that the movable jaw 3 is able to move around the axis of the swivel pin 25 on the movable block body 24 within a certain range of angles, there being a locking pin 26 installed on the movable jaw 3, a spring element 27 (more specifically tension spring) connecting the movable 10 jaw 3 with the movable block body 24 inserting the locking pin 26 into a corresponding positioning groove such that the entire movable support 4 is locked on the sliding rod, the elasticity of the spring element 27 applied on the movable jaw 3 having the same direction as the force applied on the movable jaw in the pressure mode. A small cover plate 34 is installed on the movable block body 24 15 such that the spring element 27 can be installed by simply opening the small cover plate 34. Therefore, the entire movable support can be dismounted from one end portion of the sliding rod and mounted in the other end portion of the sliding rod by turning the movable jaw 3 to overcome the elasticity of the spring element 27 such that the locking pin 26 falls out of the positioning groove of the sliding rod. In the 20 construction as shown in figures 1-3, the movable support 4 is mounted in the left end portion of the sliding rod 5, which is suitable for clamping a workpiece by the stationary support 2 and the movable support 4. In the construction as shown in figure 4, the movable support 4 is mounted in the right end portion of the sliding rod 5, which is suitable for supporting a workpiece by the stationary support 2 and 25 the movable support 4. In particular, since the elasticity of the spring element 27 applied on the movable jaw 3 has the same direction as the force applied on the movable jaw in the pressure mode, the stronger the clamping force the more preferably the locking pin 26 stays within the positioning groove of the sliding rod, which assures a solid connection between the movable support 4 and the sliding 30 rod 5. For convenient dismounting and mounting, the movable block body 24 comprises a bore point 28, and the movable support 4 comprises a compression point 29 extending to the bore point 28. The movable support 4 can be dismounted by pressing the compression point 29 to turn the movable jaw 3 to overcome the elasticity of the spring element 27 such that the locking pin 26 falls out of the WO 2012/036596 PCT/SE2010/050973 10 positioning groove of the push or pull rod. Similar operation is applied for mounting the movable support whereby the locking pin 26 is turned a certain angle such that the movable block body enwraps the sliding rod and the locking pin is inserted into the positioning groove of the sliding rod. 5 There are positioning pins 30A, 30B installed in the two end portions of the sliding rod 5 corresponding to the positioning grooves, which direct the movable support 4 such that the locking pin is perfectly oriented opposite to the positioning groove when the movable support 4 is mounted on the sliding rod. The stationary support 2 is connected to a release shank 31 opposite to 10 the stationary shank 9, and the release shank 31 comprises a release point 32 for pushing the entrainment plates 7. Unloading can be brought about by simply clasping the stationary shank 9 and the release shank 31 such that the release point 32 pushes the entrainment plates 7 to detach from the sliding rod 5. Furthermore, the release shank 31 is installed between the stationary shank 9 and 15 the actuating shank 6, and is connected to the stationary support 2 by means of a swivel pin 33, which forms a compact construction and makes it easy to operate. Moreover, the effort-saving effect can be achieved due to the full use of the leverage. The construction as shown in figures 1-4 is a first embodiment of a 20 clamping tool according to the invention. The stationary shank 9 and the actuating shank 6 are clasped for clamping a workpiece. Before the workpiece is clamped by the stationary support 2 and the movable support 4 and as shown in figure 2, the actuating shank 6 moves around the axis of the first support point 12, the actuating plates 8 displaces the sliding rod 5 over a larger distance D1 rightwards 25 each time the stationary shank and the actuating shank are clasped. When the actuating shank 6 is released, the actuating plates 8 are restored to the default position by the return spring element 20. The clasping of the stationary shank and the actuating shank is repeated until the workpiece 35 is clamped by the stationary support 2 and the movable support 4 as shown in figure 3. The actuating shank 6 30 moves around the axis of the second support point 13 each time the stationary shank and the actuating shank are clasped. The sliding rod 5 is displaced by the actuating plates 8 over a smaller distance D2 rightwards while a larger clamping force is acquired each time the stationary shank and the actuating shank are clasped. When the workpiece needs to be unloaded from the clamping, the WO 2012/036596 PCT/SE2010/050973 11 release can be brought about by simply clasping the stationary shank 9 and the release shank 31 such that the release point 32 pushes the entrainment plates 7 to detach from the sliding rod 5 and thereby the locking of the sliding rod is lifted. The sliding rod can be moved leftwards or rightwards such that the movable 5 support 4 can be adjusted to a proper position. For the workpiece to be supported by the stationary support 2 and the movable support 4 as shown in figure 4, the operation is similar to that shown in figures 2 and 3 and thus not repeated here. According to figures 5-7 a second embodiment of a clamping tool according to the invention comprises a further device 40 in the form of a lever 40 10 for increasing a clamping force. The lever is of metal but other materials are also possible. When using this second embodiment of the tool an object is first clamped firmly with a persons effort strength with the lever in the open position, see figure 5, whereafter the lever is pressed as far as the person wants, for instance half the way, see figure 6, or all the way, see figure 7, intermediate positions also being 15 possible, in order to increase the clamping force as much as desired. When the lever 40 is pressed towards the rest of the clamping tool and the lever rotates around an axis of rotation 41, a fork-shaped part (not shown) of the level situated between two other parts of the tool that are somewhat flexible in relation to each other, for instance between a jaw and a support supporting such a jaw, presses 20 these other parts apart leading to said increasing of said clamping force in the pressure mode. The second embodiment of a clamping tool normally comprises at least one release shank 31 for at least partly releasing a sliding rod 5 from a mechanism. However, no special features according to this application, i.e. features beside and 25 above at least one substantially stationary jaw 1, at least one movable jaw 3, at least one sliding rod 5, at least one actuating shank 6 and at least one substantially stationary shank 9, need to be present on the second embodiment of a clamping tool. In other words, the lever 40 for increasing a clamping force may be present on the most basic clamping tool according to the invention and the 30 most sofisticated clamping tool according to the invention as well as all variants in between. According to the invention, the position in relation to a supporting object of the so-called stationary support 2 and the so-called stationary jaw 1 respectively is essentially constant when the tool is used and thus the terminology "stationary WO 2012/036596 PCT/SE2010/050973 12 support 2" and "stationary jaw 1" respectively was adopted. The position of the so called movable support 4 relative to that of the stationary support 2 and of the so called movable jaw 3 relative to that of the stationary jaw 1 respectively shifts with the movement of the sliding rod 5 and thus the terminology "movable support 4" 5 and "movable jaw 3" respectively was adopted. The invention has the following advantages: One advantage is achieved by the two support points installed in the actuating shank. In the unloaded mode, the movement of the actuating shank is enabled around the axis of the first support point, whereby the actuating point of 10 the actuating shank acquires a larger feed pressure leading to rapid displacement due to appropriate lever arm relationship each time the actuating shank is clasped. In the pressure mode, the movement of the actuating shank is enabled around the axis of the second support point, whereby the actuating point of the actuating shank acquires a stronger clamping force due to appropriate lever arm relationship 15 each time the actuating shank is clasped. Another advantage is achieved by the positioning grooves installed in the two end portions of the push or pull rod. The movable jaw is connected to the movable block body by means of a swivel pin, and there is a locking pin inserted into the positioning groove by means of a spring element, which enables 20 convenient dismounting and mounting of the movable support from/onto the push or pull rod. The clamping tool can be rendered both functions of clamping and supporting by mounting the movable support in either one of the two end portions of the sliding rod. Moreover, in the pressure mode the locking pin is coercively inserted into the positioning groove by the clamping force, which promotes a solid 25 connection between the movable support and the sliding rod and thereby strong enough clamping force. Yet another advantage is achieved by adding a release shank. Unloading can be brought about by simply clasping the stationary shank and the release shank. Particularly, the release shank is installed between the stationary shank 30 and the actuating shank, which forms a compact construction and makes it easy to operate. Moreover, the effort-saving effect can be achieved due to the full use of the leverage. Yet another advantage is achieved by adding a further device in the form of a lever for increasing a clamping force.

WO 2012/036596 PCT/SE2010/050973 13 The invention is not limited to the embodiments shown here but may be varied within the scope of the appended claims. List of reference signs 5 1. stationary jaw, 2. stationary support, 3. movable jaw, 4. movable support, 5. sliding rod, 10 6. actuating shank, 7. entrainment plates, 8. actuating plates, 9. stationary shank, 10. pivot point for engagement, 15 11.actuating point, 12.first support point, 13.second support point, 14. spring element, 15. swivel joint, 20 16.first cavity, 17.first cover plate, 18. bore, 19. locking spring element, 20.return spring element, 25 21.second cavity, 22.second cover plate, 23A, 23B. positioning groove, 24. movable block body, 25. swivel pin, 30 26. locking pin, 27. spring element, 28. bore point, 29. compression point, 30A, 30B. positioning pin, WO 2012/036596 PCT/SE2010/050973 14 31. release shank, 32. release point, 33. swivel pin, 34. small cover plate, 5 35. workpiece, 40. further device for increasing a clamping force, 41. axis of rotation, L1. effort arm in the unloaded mode when the actuating shank is clasped, L2. resistance arm in the unloaded mode when the actuating shank is clasped, 10 L3. effort arm in the pressure mode when the actuating shank is clasped, L4. resistance arm in the pressure mode when the actuating shank is clasped, D1. moving distance of the actuating plates in the unloaded mode each time the actuating shank is clasped, D2. moving distance of the actuating plates in the pressure mode each time 15 the actuating shank is clasped. 20 25 30 35 40

Claims

1. Clamping tool, comprising at least one substantially stationary jaw (1), at least one movable jaw (3), at least one sliding rod (5), at least one actuating shank (6) 5 and at least one substantially stationary shank (9), characterized in that said at least one movable jaw (3) is movable in relation to said at least one stationary jaw (1) substantially opposite to said at least one stationary jaw (1), said at least one movable jaw (3) being connected to said at least one sliding rod (5), said at least one sliding rod (5) being connected to at least one mechanism (7, 8, 14, 19, 20) 10 for pushing and/or pulling.

2. Clamping tool according to claim 1, wherein said mechanism (7, 8, 14, 19, 20) comprises actuating plates (8) for regulating said sliding rod (5), said actuating shank (6) comprising an actuating point (11) for pushing said actuating plates (8), 15 a first support point (12) distal to said actuating point (11) and a second support point (13) proximal to said actuating point (11),

3. Clamping tool according to claim 2, wherein said first support point (12) having a first axis of rotation and said second support point (13) having a second axis of 20 rotation, said axes of rotation being substantially at right angles with a main extension of said actuating shank (6) as well as a main extension of said sliding rod (5).

4. Clamping tool according to claim 3, wherein said substantially stationary jaw (1) 25 has a substantially stationary support (2) and said movable jaw (3) has a movable support (4), said sliding rod (5) penetrating and being attached to said stationary support (2), said mechanism (7, 8, 14, 19, 20) comprising entrainment plates (7) for regulating said sliding rod (5), said movable support (4) being mounted in one end portion of said sliding rod (5). 30

5. Clamping tool according to claim 4, wherein said stationary support (2) comprises said stationary shank (9) extending towards an end contrary to said stationary jaw (1), said stationary support (2) comprising a pivot point for WO 2012/036596 PCT/SE2010/050973 16 engagement (10), said actuating shank (6) and said stationary shank (9) being oriented opposite to each other.

6. Clamping tool according to claim 5, wherein said first support point (12) is 5 connected to said stationary support (2) and/or to said stationary jaw (1) and by means of a spring element (14), said second support point (13) and said pivot point for engagement (10) being oriented substantially opposite to each other for letting the actuating shank (6) turn around said first axis of rotation of the first support point (12) while the second support point (13) detaches from the pivot 10 point for engagement (10) under the effect of the spring element (14) when a clasping force is executed upon said actuating shank (6) and said stationary shank (9) and when there is no workpiece to clamp by said stationary jaw (1) and said movable jaw (3) and the jaws (1, 3) are not clamping each other, whereas the pivot point for engagement (10) is engaged by the second support point (13), and 15 the actuating shank (6) turnes around said second axis of rotation of the second support point (13) when a clasping force is executed upon said actuating shank (6) and said stationary shank (9) and when a workpiece is held and/or clamped by said stationary jaw (1) and said movable jaw (3) or the jaws (1, 3) are clamping each other, leading to a longer moving distance for the actuating plates (8) and the 20 sliding rod (5) in the unloaded mode each time the shanks (6, 9) are being clasped than in the pressure mode.

7. Clamping tool according to claim 6, wherein said spring element (14) connecting said first support point (12) with said stationary support (2) is a torsion spring, the 25 torsion spring being installed in said stationary support (2) by means of a swivel point (15), the two ends of the torsion spring being respectively attached to said first support point (12) and said stationary support (2).

8. Clamping tool according to claim 5, wherein said pivot point for engagement 30 (10) is arc-shaped.

9. Clamping tool according to claim 2, wherein said second support point (13) is arc-shaped. WO 2012/036596 PCT/SE2010/050973 17

10. Clamping tool according to claim 1, wherein said actuating shank (6) comprises a bore (18), said sliding rod (5) penetrating said bore (18).

11. Clamping tool according to claim 4, wherein there is at least one locking spring 5 element (19) acting on said entrainment plates (7).

12. Clamping tool according to claim 2, wherein there is at least one return spring element (20) acting on said actuating plates (8). 10

13. Clamping tool according to claim 4, wherein said entrainment plates (7) and said actuating plates (8) enwrap said sliding rod (5).

14. Clamping tool according to claim 11, wherein said at least one locking spring element (19) is at least one helical spring enwrapping said sliding rod (5). 15

15. Clamping tool according to claim 12, wherein said at least one return spring element (20) is at least one helical spring enwrapping said sliding rod (5).

16. Clamping tool according to claim 4, wherein there is at least one positioning 20 groove (23A, 23B) installed in at least one of the two end portions of said sliding rod (5), said movable support (4) and/or said movable jaw (3) comprising a movable block body (24) enwrapping said sliding rod (5), said movable support (4) and/or said movable jaw (3) being connected to said movable block body (24) by means of a swivel pin (25), there being a locking pin (26) installed on said movable 25 support (4) and/or said movable jaw (3), a spring element (27) connecting said movable support (4) and/or said movable jaw (3) with said movable block body (24) inserting said locking pin (26) into a corresponding positioning groove, the elasticity of said spring element (27) applied on said movable support (4) and/or said movable jaw (3) having the same direction as the force applied on the 30 movable support and/or the movable jaw in the pressure mode.

17. Clamping tool according to claim 16, wherein said movable block body (24) comprises a bore point (28), said movable support (4) comprising a compression point (29) extending to said bore point (28). WO 2012/036596 PCT/SE2010/050973 18

18. Clamping tool according to claim 1, comprising at least one release shank (31) for at least partly releasing said sliding rod (5) from said mechanism (7, 8, 14, 19, 20). 5

19. Clamping tool according to claim 4, wherein said stationary support (2) is connected to a release shank (31) opposite to said stationary shank (9), said release shank (31) comprising a release point (32) for pushing said entrainment plates (7). 10

20. Clamping tool according to claim 19, wherein said release shank (31) is installed between said stationary shank (9) and said actuating shank (6), and is connected to said stationary support (2) by means of a swivel pin (33).

21. Clamping tool according to claim 1, comprising at least one further device (40) 15 for increasing a clamping force.

22. Clamping tool according to claim 21, wherein said at least one further device (40) is at least one lever (40). 20

23. Clamping tool according to claim 22, wherein said at least one lever (40) is turnable around at least one third axis of rotation (41) which is substantially at right angles with a main extension of said actuating shank (6) as well as a main extension of said sliding rod (5), said lever (40) being eccentrically formed in relation to said axis (41). 25

24. Clamping tool according to claim 21, wherein said at least one further device (40) is mounted on at least one of said at least one stationary jaw (1) and/or said at least one stationary support (2) and/or said at least one movable jaw (3) and/or said at least one movable support (4) for pressing two parts of the tool apart 30 leading to said increasing of said clamping force in the pressure mode.

25. Method of dismounting a jaw and/or a support supporting such a jaw on a clamping tool according to any of the preceding claims, characterized in WO 2012/036596 PCT/SE2010/050973 19 - pressing a compression point (29) on said support (2, 4) or jaw (1, 3) to overcome the elasticity of a spring element (27) which connects said support (2, 4) or jaw (1, 3) with a block body (24) which enwrapps a sliding rod (5), - turning the support (2, 4) or jaw (1, 3) around an axis of rotation such that a 5 locking element (26) which is installed on the support (2, 4) or jaw (1, 3) falls out of a positioning element of said sliding rod (5) and - removing the support (2, 4) or jaw (1, 3) from said sliding rod (5).

26. Method of mounting a jaw and/or a support supporting such a jaw on a 10 clamping tool according to any of the preceding claims, characterized in - putting the support (2, 4) or jaw (1, 3) on an end of a sliding rod (5) letting said sliding rod (5) penetrate the support (2, 4) or jaw (1, 3) as much as possible, - pressing a compression point (29) on said support (2, 4) or jaw (1, 3) to overcome the elasticity of a spring element (27) which connects said support (2, 4) 15 or jaw (1, 3) with a block body (24) which enwrapps said sliding rod (5), - turning the support (2, 4) or jaw (1, 3) around an axis of rotation such that a locking element (26) which is installed on the support (2, 4) or jaw (1, 3) opens up for said sliding rod (5) to further penetrate the support (2, 4) or jaw (1, 3) and - letting said sliding rod (5) penetrate the support (2, 4) or jaw (1, 3) until said 20 locking element (26) falls into a positioning element of said sliding rod (5).

27. Method according to any one of the claims 25 or 26, wherein said locking element (26) is a locking pin (26). 25

28. Method according to any one of the claims 25-27, wherein said positioning element is a positioning groove.