Patent GB-673465-A (GB)
Title: Improvements in or relating to a remote control system embodying an indicator at the control station for showing the condition of the device being controlled
IPC: G08C25/02
Filed: 1947-08-12
Abstract: 673,465. Electric control systems. PARFITT, F. P. Aug. 12, 1947. No. 22424/47. Class 40 (i). In a remote control system for a mobile vehicle, a succession of signals is transmitted according to the extent of controlled movement required. Each signal varies by a predetermined amount the setting of a control element at the receiver and the setting so effected is displayed at the transmitter by an indicator set by each transmitter signal. The invention is described as applied to controlling the speed and course of a target launch the control impulses being transmitted and received by radio as described in Specification 673,463. Transmitter. Course control is effected by operating a two-way switch 68, Fig. 5, to the "port" or "starboard" position whereupon a motor 60 runs in a corresponding direction and drives through a shaft 62, a cam 64 which closes contacts 65 to initiate transmission of a control signal once during each revolution. The impulsing circuit is made from contacts 71 (65) over auxiliary contacts 76 or 77 of switch 68 dependent on the position thereof, and terminals 1, 2 or 2, 5 whereby, as disclosed in Specification 673,463 the signal transmitted comprises two simultaneous pulses at different frequencies amplitude modulated on to the carrier. Each transmitted signal alters the course of the vehicle, through 5‹ to port or starboard (see below) according to the'sense of operation of switch 68, and the target heading is indicated at the transmitter, Fifg 4 (not shown) on a graduated disc rotated through 5 degrees by worm gearing for each revolution of the cam shaft 62. Throttle control is effected by depressing throttle "open" or "closed" buttons 120, 121, respectively, which as described in Specification 673,463 close the appropriate impulsing circuits. At the same time the manual depression of the buttons steps a shaft in the appropriate sense through respective ratchets, Figs. 6, 7 (not shown) to actuate a throttle position indicator. Five throttle positions are catered for and the throttle at the receiver may be stepped through these positions by successive depressions of the corresponding button 120, 121. Receiver. The steering control comprises an automatic pilot as described in Specification 673,464, [Group XXXV], in which the course of the vehicle is varied in steps of 5 degrees by means of two solenoids energized respectively according to the transmitted "port" or "starboard" signal. The throttle control comprises solenoids 97, 104, Fig. 2, adapted to be energized when the corresponding buttons 120, 121 are depressed, and arranged to step a ratchet wheel 90 in opposite directions to any one of five settings determined by a spring urged stop pin 107. The ratchet wheel carries insulated semi-circular contact strips 91, 92 co-operating with a follow-up switch arm 109 and brush 110 which in known manner controls a follow-up motor, Fig. 8 (not shown) through solenoids to set the throttle in accordance with the setting of the ratchet wheel and return the switch arm 109 to the neutral position.