Patent GB-834663-A (GB)
Title: An improved remote control manipulator
IPC: B25J3/04
Filed: 1956-05-25
Abstract: 834,663. Electric correspondence control. UNITED STATES ATOMIC ENERGY COMMISSION. May 25, 1956 [June 21, 1955], No. 16283/56. Class 40 (1). [Also in Group XL (c)] In a remote-control manipulator comprising a master unit and a slave unit, each capable of seven types of movement, seven transducer assemblies on each unit, corresponding assemblies on the master and slave units being electrically connected, produce, when the positions of the master unit and the slave unit do not correspond, error signals which actuate servomotors to bring the slave unit into a position corresponding with that of the master unit, and to exert against the operation of the master unit a mechanical force corresponding to the opposition to movement encountered by the slave unit. Construction of master and slave units.-These are identical except that at the end of an arm 52, Figs. 1, 2, the slave unit has a normally open gripping device and the master unit has a handle for moving the arm and controlling the remote gripping device. Each of the seven movements is transmitted with the aid of a selsyn and a two-phase motor, the motor at the master end providing a torque to oppose the initiating movement. Axial movements of the arm 52 are transmitted to a selsyn &c. via an arm 51 and gearing 87, 88. Rotation of the arm 52 in a plane normal to the paper rotates arm 51 about its axis and operates a further selsyn &c. via quadrant 81. Movements about the pivot at the end of arm 51 are communicated via a link 96 and further gearing 91, 98, Fig. 7. In addition, rotation of the lower part of arm 52 about its axis is transmitted by bevel gearing and a cable and pulley arrangement and further cable and pulley arrangements are provided for transmitting movements of the control handle (or tool) about axes 171, 172, Fig. 9, and for transmitting the gripping movement. The pulley driven gear-boxes 54 ... 57 are spring urged away from their supports to keep the cables taut. The arms are counterweighted by an adjustable weight 116 on an arm 72 pivoted on arm 52 and linked to arm 51 for parallel move. ment and by a weight 115 secured to the carriage on which arm 51 is mounted. Operation of control system, Fig. 15.-On movement of the arm of the master unit, positional disagreement is brought about between the selsyns of at least one of the seven transmission systems. The resulting error signal at the master end, after amplification at 211 is applied to both motors in parallel. Rate signal components are provided by tachometer generators on both motor shafts. A limiter 210 reduces the signal to a safe value if the system is switched on with the two units out of alignment. The other transmission systems are similar. Limiter, Fig. 16 (see Group XL (c)).-The error signal path is shunted by a network including a pair of diodes 234, 236 connected in opposite directions and biased so as normally to be non-conducting. When the signal voltages exceed the bias voltages the diodes conduct and become effective shunts for the excess signal voltages. U.S.A. Specification 2,774,488 is referred to.