Patent GB-403213-A (GB)
Title: Improvements in machines for producing concrete reinforcing members
IPC: B21D11/15
Filed: 1932-10-28
Abstract: 403,213. Twisting rods &c. axially or together. ISTEG-STEEL CORPORATION, 12, Rue des Dahlias, Luxemburg. Oct. 28, 1932, No. 30292. Convention date, May 31. [Classes 83 (iii) and 83 (iv).] Chucks: stretching.-In a machine for simultaneously stretching and twisting concrete reinforcing members such as rods or angle bars axially or pairs thereof together, two separate members or groups thereof are held parallel to each other and are simultaneously twisted axially or together in opposite directions. The pairs of chucks may be axially immovable during operation to effect the stretching or may be moved relatively to each other for the same purpose. The rods are drawn through centering guides 74, Fig. 8, by a number of successive sets of feed and straightening rolls 71, 72 and fed thereby into counterweighted shoots 37, 38, Fig. 3, which are tilted by hand so as to transfer the rods to troughs 18 on an intermittently hand or power-operated chain conveyer 17 with the troughs in alignment with the pairs of twisting chucks 7 and 6, Fig. 1. The guides consist of eccentrically mounted collars adjusted through intermeshing pinions 74a by a hand wheel 75. The rods at one end are clamped in the adjustable non-rotatable jaws 6 carried by a slide which is adjustable by a wheel 15 and rack 15a and held in position by a pawl 14a. The rods are centered between the chucks by pivoted fingers 67, which are adjusted by a right and left hand screw 70. Twisting is effected by rotating the chucks 7, which are keyed to shafts 12, Fig. 10, geared together at 10c so as to rotate in opposite directions and driven by a pinion 9 from a motor 10, controlled by a starter 10a with hand wheel 10b. The chucks are axially moved on the shafts 12, Fig. 7, by a hand lever 11 through a knee lever 62, 63 and sleeve 55. To the joint 64<1> of the lever 62, 63 is connected a rod 65 attached to a foot lever 66 so as to lift the joint 64<1> prior to operation of the lever 11. The sleeve is initially fixed on the chuck body by a pivoted latch 58, but when the latch drops into an inclined slot 61 in the end of the shaft, the sleeve moves along the body and through rods 54, links 49, 50 and wedges 48 adjusts the jaws 46 radially. The jaws 46 are mounted in guides in spring-returned slides 45 and are under the control of springs 47 so as to obtain an increased clamping pressure. The links 50 are attached to a bolt 53 passing through the chuck body and connected to the rods 54. The length of the links 49, 50 is adjustable by links 51 mounted on eccentrics 52 to suit the diameter of the work. One of the shafts 12 is connected by gearing 32a, 32, Fig. 10, to a shaft 20 on which is loosely mounted a member 24, Fig. 4, carrying a chain wheel 35 which is connected by a chain to the starter 10a. The gear 32 is frictionally mounted between a spring-pressed disc 34 and a star wheel 31, both keyed on the shaft 20 ; part of the shaft 20 is screwed to engage a traversable nut 21 having forked arms 21a. On the screw is adjustably fixed a ring 22 and a clamp nut 76 ; the nuts 21 and 76 have indicators 77a, 77 co-operating with scales on arms 23 projecting from the member 24. After the desired number of revolutions of the shaft 20 have been effected the nut 21 contacts with either the ring 22 or the nut 76 so causing the member 24 to be rotated thereby so as to drive the chain and cut off the current from the motor. In order to prevent the starter over-running due to inertia of the motor, the member 24 has inclined edges, Fig. 6, which operate a spring-returned bolt 28, so as to engage the star wheel 31 and thus stop the shaft 20, whereupon the gear 32 comes to rest under control of the spring-pressed disc 34. The fixed jaws 6 may be replaced by chucks each rotating in the opposite direction from its chuck 7. The machine may be provided with more than two pairs of simultaneously operated chucks.