Patent GB-300851-A (GB)
Title: Bending machine for rod iron and profile iron and particularly for iron for ferro-concrete
IPC: B21D11/12
Filed: 1928-03-07
Abstract: 300,851. Wagenbach, A. March 7, 1928. Angular bending.-In a machine for bending ferro-concrete reinforcement and other metal bars of the kind comprising a bending lever or rotatable disc actuated by reversing gear with a reversing device adapted to be located in neutral as well as clockwise and anti-clockwise driving positions, which reversing device is influenced bv a stop moving with the bending lover &c. to stop the drive at the end of the bending operation, two levers or slides mounted on the machine frame and coacting with the stop on the bending lever are so connected with the reversing device that the latter is brought automatically to neutral position at the end of every stroke of the bending lever &c., whether a working stroke or return stroke. The rotary disc 2 has a central bending pin 4 and is provided with a series of holes 5 adapted to take the bending pins 6, 7, the pin 6 having a dog 8 for clamping the end of the iron bar against the central pin 4. The disc 2 is mounted on a vertical shaft 9 carrying a large gear 10 driven by a pinion 11 on another vertical shaft 12 which carries a bevel wheel 13 driven by a bevel pinion 14 on a horizontal shaft 15- .carrying a large gear 17 engaging a pinion 18 fast on another horizontal shaft 16. The latter has loose thereon two large gears 19, 20 driven in reverse directions from the shaft 22 of a motor 23, the gear 20 driven directly by the pinion 21 and the gear 19 by the pinions 24, 25. Either of the gears 19, 20 can be clutched to the shaft 16 by couplings 26, 27 controlled by coupling sleeves 26<a>, 27<a> longitudinally displaceable by a rod 28 and fork 29 on a shaft 30 carrying a lever 31 connected to a double pedal 32. The disc 2 has an adjustable stop 33 co-operating with a twoarmed lever 34, 35 connected by a lever and link device 36 - - 40 with the control shaft 30 of the couplings 26, 27. Fig. 8 shows the disc 2 making a return stroke in a clockwise direction after a hook a has been formed on the end of the iron bar during the previous anti-clockwise movement of the disc, the return stroke of the disc having been inaugurated by the contact of the stop 33 with the lever arm 34. At the end of the return stroke the stop 33 contacts with the lever arm 35, the drive is reversed and the bar is bent into an elbow b round the fixed pin 4 and against the stop bar 3, as shown in Fig. 10. As a smaller angular movement of the disc is required for the elbow b than for the hook a the stop 33 contacts at the end of the second working stroke with a latch 41 pivoted on the arm 34 and moved into operative position by a rod 43 or with an adjustable stop screw 44 on the latch 41. The machine may be operated by belt drive instead of by a motor and the change gear drive may be replaced by open and crossed belts with the belt shifting forks pushed from the fast to the loose pulleys by the levers 34, 35, or the shifting started by the action of the levers and completed in known manner by a spring or weight-loaded swinging lever. Instead of being mounted on the disc &c. 2 the stop 33 may be mounted on another part rotating with the disc, e.g. on one of the gears 10 or 13 or on an intermediate disc. The separate stop 33 may be dispensed with and its function served by the bending tool itself.