Patent GB-507900-A (GB)
Title: Improvements in or relating to punching or riveting tools
IPC: B21J15/26
Filed: 1937-09-20
Abstract: 507,900. Riveting; punching. HELLER, H., (trading as HELLER, GEB.). Sept. 20, 1937, No. 20001. [A Specification was laid open to inspection under Sect. 91 of the Acts, Jan. 18; 1938.] [Class 83 (iv)] A punching or riveting tool of the kind in which a pair of arms or limbs coupled to inwardly directed jaws are relatively movable towards each other to apply pressure to the work, comprises a tubular member forming a handle and at one end of which the jaws are supported for relative movement, a rod guided within said tubular member and connected to one of said jaws, a lever supported at the other end of the tubular member for actuating the rod to move the jaw relatively to the other and a coupling which is instantly dislocatable to permit relative movement independently of the actuation of the rod. In one form this relative movement is in the direction of the pressure movement and in another form is transverse to the direction of the pressure movement. The jaws 2, 3, Fig. 4 are mounted at one end of a tubular member 1, an operating lever 4 being pivoted on the opposite end. The lever is pivotally mounted on a shaft 9, Fig. 1, between the legs 4 of a fork, circular openings 6 in which are closed by covers 8. The forked ends 12 of the lever engage members 11 of square form on the spindle 9, the members 11 carrying pins 10 actuating through a link 13, the rod 19 which controls the jaws. A bayonet sleeve 20 forms an extension of the fork 5 and has notches 22 normally engaged by abutments 23 on the tube 1. The abutments may be brought into longitudinal slots 21 in the sleeve by partial rotation of the lever about the axis of the member 1 so that the jaws may be opened and placed in position around the work. A tube 32 serving as a handle is screwed to an extension 30 of the tube 1 and has a collar 33 clamped against a collar 35 on the tool carrier 28 by a nut 36. The actuating rod comprises two portions 19, 37 having collars 38 at their abutting ends which are held in engagement by half bushes 39. The rod 37 engages the shank 43 of the tool 2 by a screw thread 42, the shank 43 and a shank 47 of the jaw 2 being guided in sleeves 44, 48 connected to the jaw 3 and the holder 28. The jaws are adjustable about an axis BB and are locked in position by nuts 46. In a modified form, the lever 4 is replaced by a compressed air motor, Figs. 6 and 9. The rod is operated by a piston 82 through a link 80, compressed air being admitted to the rear of the piston 82 from a chamber 92 through a small piston 87. The piston 82 is returned by the rods 95 of two auxiliary pistons 97 working in cylinders 99. Compressed air is fed in through a hose connection 100 screwed at 101 into the casing 93. The connection of the cylinders to the compressed air supply or to exhaust is effected by rotation of a sleeve 106. In another form, Fig. 11, a cylindrical member 131 is attached to plates 130 carried at the end of the tubular member 126. The shank 132 of the jaw 128 is mounted on the member 131 and the shank 134 of the other jaw 129 is mounted on the shank 132. A slot 136 in the shank 134 permits longitudinal movement of the arm 133 of the jaw 128 during a working operation under the action of the rod 146. When the jaws are moved apart so that the arm 133 is clear of the slot, it may be moved angularly along one of two steps 137 formed in the shank 134. The jaws are actuated by the rod 146 through a nut 151 which is adjustable to vary the distance apart of the jaws independently of the operating lever. Specification 477,150 is referred to.