Clamping Apparatus

Abstract

The invention relates to clamping apparatus for a workpiece. The apparatus includes first and second jaws, one of which is movable by operator operation of a lever assembly and locking means are provided to selectively lock the movable jaw in position. The locking means can be actuated by the operator's foot thereby leaving the operator's hands free to perform work on the workpiece. An engagement system is also provided in order to allow additional accessory components to be selectively fitted to the apparatus for use in particular work operations.

Claims

1. A clamping apparatus, said clamping apparatus comprising: a support structure; at least two clamping jaws, at least one of the jaws linearly movable with respect to the other jaws to define a spacing between the jaws within which a workpiece is held in position by the at least two clamping jaws; a lever assembly pivotally connected to the support structure and provided to be pivotally moved by an operator for engaging and driving movement of the at least one linearly movable jaw to apply a clamping force to the workpiece positioned between the at least two clamping jaws; and locking means for locking the at least one movable jaw in an operator selected position, and wherein the locking means is actuable by the operator contacting a locking means actuator via a foot of the operator.

2. Apparatus according to claim 1 wherein the locking means actuator includes or is connected to a pedal with which the operator's foot contacts.

3. Apparatus according to claim 2 wherein the pedal is provided to operate the lever assembly.

4. Apparatus according to claim 2 wherein the locking means actuator is pivotally movable with respect to the lever assembly to allow selective locking of a position of the at least one jaw when the locking means actuator is moved in a first direction and an unlocking position of the at least one jaw when the locking means actuator is moved in a second direction.

5. Apparatus according to claim 4 wherein the second direction is opposite to the first direction.

6. Apparatus according to claim 3 wherein the locking means actuator is formed integrally with the pedal.

7. Apparatus according to claim 6 wherein the locking means actuator is formed as a portion located at an edge of the pedal and said portion includes a first surface to be contacted to lock the locking means actuator and a second surface to be contacted to unlock the locking means actuator.

8. Apparatus according to claim 7 wherein the first surface of the locking means actuator is provided to be acted upon by toes of the operator's foot to move the locking means actuator in a first direction and the second surface of the locking means actuator is provided to be acted upon by a heel of the operator to move the locking means actuator in an opposite direction.

9. Apparatus according to claim 8 wherein the pedal is connected to movement means for the at least one movable jaw by the lever assembly and the locking means actuator is connected to the locking means via first and second members with which the pedal is connected and which are selectively movable independently of the lever assembly.

10. Apparatus according to claim 9 wherein the first and second members and locking means prevent pivotal movement of the lever assembly when the locking means are engaged.

11. Apparatus according to claim 1 wherein when the locking means are unlocked, reciprocal movement of the lever assembly repeatedly operates drive means to progressively advance the at least one movable jaw towards a fixed jaw.

12. Apparatus according to claim 1 wherein the support structure includes an elongate support body in which is defined a track with respect to which the at least one movable jaw is moved towards and away from a fixed jaw.

13. Apparatus according to claim 12 wherein the at least one movable jaw is provided as part of a carriage which is movable with respect to the support body.

14. Apparatus according to claim 13 wherein the support body track is housed within the carriage.

15. Apparatus according to claim 13 wherein the lever assembly includes a series of movable teeth on the support body track which are reciprocally linearly movable under influence of movement of the lever assembly and which teeth progressively engage with sets of apertures of a series of apertures formed in a linear path along the underside of the carriage such that engagement of the teeth with a first set of apertures located above the teeth, moves the carriage the carriage when the teeth are moved, the teeth then engage with a new set of apertures located above the teeth and move the carriage again, and this is repeated as required with each cycle of movement of the lever assembly, so as to progressively move the carriage, and movable jaw thereon, towards the fixed jaw as the lever assembly is moved.

16. Apparatus according to claim 1 wherein at least three support legs support a support body at a fixed distance from a support surface and the at least three support legs and lever assembly are provided to be movable with respect to the support body between storage and in-use conditions.

17. Apparatus according to claim 1 wherein the lever assembly and locking means are located at an end of a support body at which a fixed jaw is located.

18. Apparatus according to claim 1 wherein a support body includes a locating means to allow at least one accessory component to be located therewith.

19. Apparatus according to claim 18 wherein the locating means is provided in the form of a first part with a plurality of male and/or female engagement means formed therein for the selective reception of the other matching male and/or female engagement means provided on a second part.

20. Apparatus according to claim 19 wherein the engagement means allow engagement and disengagement of an accessory component with the support body via a sliding movement.

21. Apparatus according to claim 20 wherein the locating means include a further locating assembly which is movable to a position to prevent the sliding movement of the first and second parts.

22. Apparatus according to claim 21 wherein the locating assembly is biased to the position.

23. A clamping apparatus, said apparatus comprising: two adjustably spaced apart jaws carried by a support structure including a support body in which first and second clamping jaws are located, movement means for moving at least one of the jaws relative to another fixed jaw, and the support body includes a locating means to allow at least one accessory component to be located therewith, and wherein said locating means provided in a form of a first part provided with the support body with a plurality of male and/or female engagement means formed therein for selective reception of another of matching male/or female engagements provided on a second part provided with the at least one accessory component such that the engagement means allow engagement and disengagement of the first and second parts, and hence the accessory component and support body to which the first and second parts are respectively connected or formed.

24. Apparatus according to claim 23 wherein the engagement and disengagement is achieved via relative sliding movement.

25. Apparatus according to claim 24 wherein the locating means include a further locating assembly which is movable to a position to prevent the sliding movement of the first and second parts.

26. Apparatus according to claim 25 wherein the locating assembly is biased to the position.

Description

[0042] Specific embodiments of the invention are now described with reference to the accompanying drawings; wherein:

[0043] FIGS. 1a-b illustrate the apparatus in accordance with the invention in an in use condition and part of the apparatus in a storage condition;

[0044] FIGS. 2a-b illustrate the locking means in accordance with one embodiment of the invention;

[0045] FIGS. 3a-b illustrate the locking means in accordance with another embodiment of the invention; and

[0046] FIGS. 4a-e illustrate locating means in accordance with one embodiment of the invention.

[0047] Referring firstly to FIG. 1a, there is illustrated clamping apparatus of the form to which the invention relates. The apparatus 2 includes a support body 4 which incorporates an integral track 6 and a fixed jaw 8. A movable jaw and carriage assembly 10 is provided, with the movable jaw upstanding and substantially parallel with the fixed jaw and the carriage is substantially n-shaped and receives the track 6 therein so that the movable jaw and carriage assembly is located on the track 6 for movement there along. The support body is located at a fixed distance from the support surface 12 by legs 14,16, 18 which can be moved between the in use condition shown and pivoted with respect to the support body 4 to a storage condition in which the same lie substantially in line with the elongate support body 4. FIG. 1b shows the provision of the lever assembly 20 and locking means 32 in a storage condition with respect to the longitudinal axis 34 of the support body and the legs 14,16,18 (not shown) would also lie substantially parallel to the longitudinal axis 34 in the storage condition.

[0048] The movement of the jaw and carriage assembly 10 is achieved by operator foot operation of a lever assembly 20 which includes a foot pedal 22 at the end 24 of the assembly and the assembly is pivotally located at pivot 26 to the support body 4.

[0049] The operation of the lever assembly 20 via the foot pedal 22 is achieved by the operator placing their foot in contact with the portion 28 of the pedal and moving the foot pedal 22 and hence lever assembly 20 forwards and backwards as indicated by arrow 25. This movement is translated through the pivot points 27 which connect the pedal to the lever assembly and by the lever assembly via pivot 26 and in turn to a ratchet mechanism to which the movable jaw and carriage assembly 10 are connected so as to provide an advancing movement action on the movable jaw and carriage assembly 10 so as to move the same towards the fixed jaw 8 in the direction of arrow 11. The movement is translated to the carriage from the support body, in one embodiment, by the lever assembly including a series of movable teeth on the support body track which are reciprocally linearly movable under the influence of the movement of the lever assembly. The teeth progressively engage with sets of apertures of a series of apertures formed in a linear path along the underside of the carriage such that engagement of the teeth with a first set of apertures located above the teeth, moves the carriage when the teeth are moved by the lever assembly. The teeth then engage with a new set of apertures which are now located above the teeth and move the carriage again, and this is repeated as required with each cycle of movement of the lever assembly. This allows the progressive movement of the carriage and movable jaw thereon, towards the fixed jaw as the lever assembly is moved.

[0050] The jaws 8 and 10 define a space 15 therebetween and into which a workpiece 64 is placed and the jaw 10 is then moved to contact the workpiece and, in conjunction with jaw 8, clamp the workpiece in position. Typically each movement of the lever assembly for a predetermined distance by the operators foot will cause a step movement of the movable jaw and carriage assembly 10 towards the fixed jaw. When the movable jaw 10 is in the required position and the required clamping force is applied, the position of the movable jaw 10 can be locked using a locking means in the manner as now described.

[0051] FIG. 1a and FIGS. 2a and b illustrate the lever assembly 20 and locking means 32 of the apparatus in accordance with one embodiment of the invention in more detail.

[0052] In accordance with the invention, the foot pedal 22 of the lever assembly, in addition to including the portion 28 for contact by the operator's foot to cause the pivotal movement of the lever assembly 20 with respect to the support body 4 and hence the movement of the movable jaw and carriage assembly 10, also includes a locking means actuator portion 30 and the foot pedal is also pivotally connected 36 with members 38 and 40 provided as part of the locking means which, when in a locking position, prevent the movement of the lever assembly and hence prevent the provision of a moving force on the movable jaw and carriage assembly 10 and hence maintain the same in the fixed locked position and maintain the clamping force which is being applied to a workpiece at that time. The operator will typically operate the locking means when the two jaws are in position clamping the workpiece between the same and sufficient clamping force is being applied so as to maintain the workpiece in position without the operator having to hold the workpiece with their hands. As such, and as the locking means can be foot operated as well, both of the operators hands are free to perform the work on the workpiece at all times.

[0053] The locking means actuation portion 30 of the foot pedal has a first, under, surface 42 and a second, opposing, top surface 44. The under surface 42 is provided to be selectively contacted by the toes of the foot of the operator and thereby flipped or moved upwardly as indicated by arrow 46 and this causes the locking means to be moved to a locked position and hence lock the jaw 10 in position. The top surface 44 is provided to be selectively moved by contact with the heel of the operator's foot and moved downwardly as indicated by arrow 48 to move the locking means to the unlocking position and hence allow the jaw 10 to be free to be moved.

[0054] FIGS. 3a-b illustrate a second embodiment of the locking means using the same reference numerals and it will be appreciated that in both cases the operation of the locking means is achieved utilising the foot operation of the locking means via the pedal 22 portion 30 as described.

[0055] In both embodiments, the locking means include a locking shaft 52 and actuator members which are moved under the influence of the movement of the pedal. The actuator members 38,40 act on a lock plate to allow the same to be moved between locking and unlocking positions with respect to the lock shaft and so, in turn prevent the movement of the movable jaw 10 when the locking means is in the locked position and, when released, movement of the jaw 10 is again possible. Said members 38,40 and locking plate act to prevent movement of the jaw by preventing pivotal movement of the lever assembly when the locking means are engaged.

[0056] There is therefore provided the possibility of hands free operation of the movement of the movable jaw as well as the locking and unlocking of the movement mechanism for the same.

[0057] Turning now to FIGS. 4a-e, there is illustrated an embodiment of the apparatus in which locating means for an accessory component can be provided in accordance with the invention. The accessory may be provided to allow another work action to be performed using the apparatus or may be to allow a particular function of the apparatus to be adapted.

[0058] In FIGS. 4a-c there is illustrated an accessory component in the form of a support 66 for a workpiece in the form of a plank 64. At one end there is provided a stand 60 which is clamped to the plank and the stand is located at a spaced distance from the apparatus 2. At the support body 4 there is provided a locating means 62 in accordance with the invention. The locating means is provided, in this example, to engage with a baton 66 which is provided as part of the accessory and is also attached to the stand 60.

[0059] The baton 66 is shown in more detail in FIG. 4d and one part 68 of the location means is illustrated as a plate which, in this example, is attached by screws 70 in a fixed position on the baton. The location means 68 includes male engagement pins 72 which are mushroom shaped as shown. The locating means plate 68 also includes an aperture 84.

[0060] The second part 74 of the locating means is illustrated in FIG. 4e. This part 74 is provided at the end of the support body at which the fixed jaw 8 is located. This part includes matching female key hole slots 76 for the reception of the pins 72. There is also provided a pin 78 which is to be received in the aperture 84 of the part 68 and the pin passes through a channel in the second part 74 from the locating assembly 80 and is biased to protrude outwardly of the surface 82.

[0061] In order to engage the two parts 68, 74 of the locating means, the surfaces 86 and 82 of the respective parts are brought together so that the pins 72 of part 68 move into the head portion of the respective keyhole slots 76 of part 74. This movement of the surfaces towards each other also causes the pin 78 to be moved against the biasing force of a spring in the locating assembly 80 and lie substantially flush with the surface 82.

[0062] With the pins 72 in the respective keyhole slots 76, relative sliding movement of the part 68 in direction of arrow 88 shown in FIG. 4e moves the pins 72 into the narrower section of the keyhole slots 76 and, when the pins 72 are fully in position, the aperture 84 in the part 68 will be in line with the pin 78 in part 74 such that the pin 78 is then free to move under the influence of the spring in the assembly 80 and protrude into the aperture 84 and lock the two parts 68,74 in position to prevent sliding movement.

[0063] To release the parts 68,74 the assembly 80 is gripped and moved in the direction 90 to move the pin 78 out of the aperture 84 and allow the sliding movement of the parts 68,74 in direction 92.

[0064] Thus there is provided in accordance with the invention a clamping apparatus which allows improved ease and safety of operation of the same to position a workpiece with a clamping force for work to be performed thereon. The invention also provides for the location and use of a range of accessory components to be selectively located on the apparatus for use in relation to specific work requirements.