Patent GB-703380-A (GB)
Title: Improvements in or relating to hammer frame construction
Inventor: KROPP ROY AUGUST
IPC: B21J13/04
Filed: 1952-01-08
Abstract: 703,380. Power hammers. KROPP FORGE CO. Jan. 8, 1952, No. 568/52. Class 83 (4). [Also in Group XXVI] A hammer frame construction comprises a unitary assembly of individual steel plates comprising spaced side plates, an outer plate, and longitudinally separated upper and lower inner plates, all welded together, and a hammer guide supporting structure comprising an elongated box-like assembly of heavy gauge steel plates welded together said structure being set into and supported by the inner edges of the side plates between said inner plates and being welded to the plates. The hammer framework comprises a base 15 upon which are bolted frames 16 and 17 supporting a tie plate 19 which carries a steam cylinder casting 20. Each of the frames carry a guide 22 for a hammer 23 which has a die 24 co-operating with a lower die 25 mounted on the base 15. The hammer is reciprocated by a piston 29 in the cylinder 20 said piston being actuated by steam controlled by a standard control means 30. Each of the frames 16 and 17 comprises an outer side plate 31 a front plate 32 a rear plate 33 an upper inner side plate 34 and a lower inner side plate 35. All the plates are of cold-rolled steel and are welded together to form a rigid box-like structure which is welded to a heavy bottom plate 38 recessed at 39 for attachment to the base 15 by bolts 18. Welded to the top of the structure is a top plate 41 having bolt holes 42 for attachment bolts 21. The hammer guide supporting structure 43 comprises front and rear steel plates 44 and 45 respectively, a back plate 47 and top and bottom plates 48 and 49 respectively all welded together to form a rigid structure. Each of the frames 16, 17 have cut out portions 50 for receiving the guide supporting structure 43 and the structure is welded to each. frame. Reinforcement of the assembly is effected by triangular gusset plates 51 disposed in. the inner corners formed between the back of the supporting structure 43. and the front and rear plates 32 and 33 of each frame. The hammer guide 22 is slidably adjustable in the guide supporting structure by means of a wedge 54 interposed between the guide and a pad 55 on the back plate 47 of the. structure. The back plate 47 has bores 67 aligned with. bores 68 in. the outer side plate 31 of the frame. for accommodating hammer guide securing. bolts 69. In. a modification the hammer guide 83 has a grooved guide face 84 and parallel side faces 85 which engage bearing pads 87 on the inner faces of the side walls 75 and 77 on the guide supporting structure. The guide 83 is retained by bolts: 86. and 86<SP>1</SP> having an enlarged body portion and a reduced end portion 88 extending through, a bore 89 in the guide and on which is screwed a retaining nut 90. The bolts pass through apertures 93 in the back plate 79 and through apertures 98 in the outer side wall 70a and also pass through thrust brackets 95 of U-shaped cross section. Each bracket has extending lateral flanges 97 at the extremities of the leg portions said flanges being welded to the back plate on opposite sides of the aperture 98. A compression block 99 is welded between the heels of the flanges 97. An aperture 100 in the block aligns with an aperture 101 in the bracket 95 and the threaded portion of the bolt 86 or 86<SP>1</SP> passes through both apertures. Adjustment and retention of each of the bolts is effected by a thrust nut 102, a lock nut 103 and a retaining nut 106. Up and down movement of the guide member is prevented by upper and lower locking wedges 104 which have horizontal flat surfaces 105 which engage with bearing pads 107 on upper and lower plates 80 and 81 of the guide supporting structure. The wedges also have an oblique bearing face 108 which engage a complementary bearing face 109 on the guide member. The wedge bolt 110 extends through an aperture 111 in the back plate 79 and an aperture 112 in the outer side wall 70a. Adjustment of the guide member is effected by the bolts 86 and 86<SP>1</SP> while the wedges 104 are loose after which the wedges are drawn tight by the wedge bolts. This arrangement enables the guide member to be retracted far enough to clear the hammer to facilitate its placement and removal.