Patent GB-436179-A (GB)
Title: Improvements in or relating to bolt making machines
IPC: B21K1/44
Filed: 1934-08-18
Abstract: 436,179. Forging bolts; rolling screw-threads. STEVENS, A. H., 5, Quality Court, Chancery Lane, London.-(National Machinery Co. ; Tiffin, Ohio, U.S.A.) Aug. 18, 1934, No. 23887. [Classes 83 (ii) and 83 (iv)] In a bolt making machine comprising a slide arranged to reciprocate on the frame of the machine and carrying tools co-operating with tools on the frame, one of the tools co-operates with means to engage the blanks, while in the path of the slide and successively transfer them out of that path to a pointing, roll-threading &c. mechanism operating on the shank portion of the blank. The machine comprises a bed frame 10, Fig. 1, carrying a die breast 11 and a header 12 both ends of which are guided to slide in the frame as it is reciprocated by a crank shaft 15 disposed intermediate its ends. The crank shaft 15 drives also a parallel counter shaft 16 which is connected through bevel gearing 18, 19 with a cam shaft 17. A cam 31, Fig. 3, on the shaft 17 actuates a cutter 29 to sever a length of stock S and carry it to the first die 20 of the three dies which respectively reduce the width of a portion of the stock to form a shank, further reduce the shank and form a polygonal head thereon, and then hold the shank while the head is trimmed. The tools co-operating with these dies are carried by the header 12 and a slide 37, reciprocated horizontally, by the cutter 29 in its carriage 36 which is reciprocated vertically by an arm rigid with a rock shaft 38, carries spring-pressed grippers 50, 51 adapted to snap over the blanks as they are ejected from the dies and transfer them in succession from the die 20 to the dies 21, 22. The trimming tool 25 co-operating with the die 22 is hollow to permit the trimmed blank to be pushed into it, and, by succeeding blanks, along a passage 64 in the header to the vertical portion 6 of a transfer tube which thereafter slopes downwards as at 68, Fig. 6, and is slotted to allow the shanks of the blanks to drop and the blanks to be suspended by their heads. At the end of the tube 68, the blanks drop on to an arcuate rail track 76 on a bracket 73 and are pushed therealong by the end of the tube as it is displaced by the movements of the header 12. A pivoted guide 71, in a slot 70 in the end of the tube 68, prevents the heads from mounting upon one another and a further guide 78 may continue this control as the blanks slide down an inclined rail track 75 to a pointing mechanism or roll roll threading dies. At its lower end, the track 75 joins a track 85 set at an angle thereto and in line with a forked pusher finger 86 pivoted at its further end to a bracket 88 on a shaft 89 rocked by a cam on the header 12 to thrust the first blank along the track 85. As the finger 86 retracts, an inclined finger 81, which has been held back by an abutment 92 on the finger 86 engaging one arm of a bell-crank lever 82 which carries the finger 81 at its other end, is thrust forward by a spring plunger 84 to feed forward the foremost blank into the path of the finger 86 and act as a gate to hold back the remaining blanks. In the pointing mechanism, the blanks snap into spring jaws 116, Fig. 7, adjustably mounted on a tube 117 pressed downwards by a spring 119 to engage the blank with an off-set rotary cutter 106. The cutter bearings 103 are protected from waste cuttings &c. by a cap 104 which directs them towards a shoot 108. At the end of the pointing operation, a lever 122 raises the tube 117 and the blank is discharged down an inclined track 123, Fig. 6, to be fed, by a mechanism similar to the finger 86, into a vertical tube 124. A pusher 134 operated by the cam shaft 16 lifts the blanks in this tube, their return being prevented by a spring detent, until they can slide down a slotted inclined portion thereof to a track 141, Fig. 1, leading to roll threading dies 142, 143. A pivoted finger 149, operated by a cam on the header 12 thrusts the blank into the path of a pusher 153 which feeds it between the dies 142, 143.