Patent GB-567943-A (GB)
Title: Improvements in machines for bending sheet metal, strip metal, wire and the like
IPC: B21D5/01
Filed: 1943-05-24
Abstract: 567,943. Angular bending. STOTT, N. May 24, 1943, No. 8265. [Class 83 (iv)] In a device for bending sheet or strip metal, wire, &c. having vice jaws, one of which carries a pivoted bending plate swinging about the inner top edge to overlie the other jaw when the vice is closed, the vice is of the type having slide rods on one jaw passing through the other, the body of the vice which carries or forms the other jaw including a channel section engaging the slide rods in each of its flanges. The device is thus rendered more robust. The movable jaw 5, which is provided with an angle member 10 carrying a knifeedged plate 11 and is operated by a screw, has a pair of rods 4 slidable in apertures in the flanges 2, 3 of an inverted channel member 1 to which the rear jaw 6 is secured or a double channel member having the rear jaw integral therewith. The rear jaw may have one or more forwardly extending supporting members 1b to pass below the front jaw when the vice is closed, 'so as to support such jaw against the thrust of the bending member. The member 6 carries a knife-edged part 8 engaging with a knifeedged part 9 carried by the bending beam 7 which is pivoted to the member 6. The member 6 has a spacing member 12 for supporting work clamped between the jaws. When the work to be bent is placed on the part 9 it engages an adjustable depth stop a surmounted by an inverted channel, or a sliding stop on the handle on the beam. Hoops or circles are formed between a pair of grooved rollers 13 mounted in brackets 14 laterally adjustable on the channel member 1 and a roller 17 mounted in a support 15 secured to the rods 4. The circle may be completed by a gapped disc 18, Fig. 5, mounted on the support 15 and rotated by a handle 20. In making saddle clips, the rollers 13 are replaced by clamping plates and the roller 17 by a plunger. The bending beam may carry an adjustable stop screw 31, Fig. 4, co-operating with one of a number of screws 32 on a rotatably adjustable disc 29 to limit the degree of angular movement. In bending angles, channels or tees, the bending beam carries a pair of supporting cheeks 33, Fig. 8, the gap between which receives the web which also engages a grooved roller 34, or between a pair of rollers carried by the movable jaw. Above the bending beam are two brackets carrying a thrust member 39 on a spindle 40. The ends of the cheeks 33 may have gear teeth meshing with similar teeth on further cheeks rotatable about the axis of the roller 34. The roller may be replaced by a square block with rounded corners. In another method of bending angles &c., Fig. 9, two rollers, 40, 41 are grooved to admit one web and in the space between them slides a spring- loaded slotted plunger 44. In another form, a chain having blocks 45, Fig. 10, with similar grooves, is passed round both rollers and kept taut by springs 46 or the like. The point of the bend may be heated by a jet or arc. When curling the end of the work round a mandrel 28; Fig. 3, the angle member 10 on the front jaw 5 carries a pair of adjustable bevelled members 23, 24 and an angle 26 forming a ledge. The rear jaw has a thrust plate 27 which, as the vice is closed, pushes the mandrel and work into the inclined slot 25 between the jaws 23, 24. Specification 541,479 is referred to.