Patent GB-1070056-A (GB)
Title: Remote control manipulators
IPC: B25J3/00
Filed: 1965-05-11
Abstract: 1,070,056. Manipulators. ATOMIC ENERGY OF CANADA Ltd. May 11, 1965 [June 23, 1964], No. 19865/65. Heading B4Q. [Also in Division B3] A remote control manipulator comprises a master unit connected by a mechanical transmission to a slave unit, the units being constructionally similar so that when like tools, e.g. welding torches or grippers are coupled to the units, an operation on a workpiece performed using the master unit is reproduced exactly by the slave unit. In apparatus for welding within a nuclear reactor, the master unit, Figs. 2 and 15 is connected to the slave unit, Fig. 3, by a tubular casing Ca, Cb and supported on a bearing in a longitudinally pre - set adjustable location in the wall of the reactor. Rotation of the whole master unit about a vertical axis produces corresponding rotation of the slave unit through the casing Ca, Cb. The master unit comprises a frame 47a pivotally mounted on a horizontal shaft 40a journalled in plates 41a forming the upper end of the casing Ca. Pivotal movement of the frame 47a is transmitted by a gear 45a and an endless chain to a similar frame 47b in the slave unit. A rack 21a slidably guided in the frame 47a by rollers 23a is moved axially by a gear 50a fixed on the shaft 40a. An endless chain transmits rotation of the shaft 40a so that movement of the rack 21a is reproduced by the rack 21b of the slave unit. Stub axles 17a mounted in the forked end of the rack 21a are fixed to a pin 14a rotatably supporting a tool mounting 13a. A gear 25a on the tool mounting 13a meshes with gears 26a, 27a on the axles 17a. Movement of the gears 26a, 27a in the same direction produces pivoting of the tool mounting 13a about the horizontal axis of the axles 17a. Movement of the gears 26a, 27a in opposite directions produces twisting of the tool mounting 13a about an axis perpendicular to that of the axles 17a. A pair of cables attached to pulleys 28a, 29a secured to the gears 26a, 27a transmit these movements to the slave unit to produce corresponding motion of the slave tool mounting 13b. The cables pass over pulleys on a shaft 71a at the opposite end of the rack 21a prior to passing through the casing Ca, Cb to compensate for movement of the racks 21a, 21b. Handles 60a, 80a on the master unit are used to effect the operations. The movement of the racks may be power assisted. Gas, current and water supplies pass through the casing Ca, Cb to the welding torch 11b on the slave unit. The supply cable and conduits are attached to a support in the casing Ca, the support being suspended by cables attached to the rear end of the rack 21a. If the rack 21b is pivoted to a position in alignment with casing Cb the apparatus may be withdrawn from the reactor. The welding torches may be replaced by gripping devices having jaws 112b, Fig. 21, closed against spring action by cables. The cable 114b of the slave unit passes through the pin 14b and through casing Ca, Cb and is actuated by a lever on the master unit. In place of gripping jaws a releasable coupling for picking up and holding a tool may be actuated by the cable 114b. The jaws 112b may be used to position the work to be welded.