Patent GB-495595-A (GB)
Title: Improvements in electric distant control systems
IPC: G08C19/38
Filed: 1937-10-23
Abstract: 495,595. Electric control systems. GRANAT, E., and COMPAGNIE DES FORGES ET ACIERIES DE LA MARINE ET D'HOMECOURT. Oct. 23,1937, No. 29023. Convention date, Nov. 20, 1936. [Class 40 (i)] In a remote control system wherein the controlled element is driven by a source of power under the control of a regulator, positional agreement between the controlled and controlling elements is maintained by contact means which operate the regulator under the differential control of the elements. As shown in the Figure, a system for operating a gun under the control of a telescope includes transmitters 3, 4 controlled respectively by the telescope and gun and adapted to control coarse and fine differential receivers 1, 2 which, through corresponding switches 8, 37 control an auxiliary motor 31 and the regulating rheostat 10 of the main motor 30. The arrangement is such that the " coarse " switch 8 operates a relay 32 when the disagreement is greater than the angle aob to switch the " fine " switch 37 out of circuit, but when the disagreement is less, the relay is released and the switch 37 takes over the control. The switch 37 is provided with a tapped resistance 25 which is gradually cut out of circuit as the position of coincidence is reached in order to reduce the speed of the motors 31, 30 gradually. The contact arms of the switches 8, 37 are driven by the receivers 1, 2 and the contacts by the motor 31 through gearing 29. In a modification wherein a disagreement of greater than 180‹ may occur and restoration through the shortest path is impossible, owing to obstructing stops at the limits of movements of the controlled apparatus, a reversing switch is also provided, the switch being controlled respectively from the transmitters 3, 4. In a further modification, the differential receivers are replaced by simple receivers controlled electrically by the controlling member, and influencing the switches through differential gears which are controlled mechanically from the controlled member. When in operation positional disagreement occurs, the receivers 1, 2 displace the contact arms from the normal positions shown to drive the motor 31 at a speed which depends upon the degree of disagreement. The motor 31 displaces the regulator 10 which switches on the driving motor 30 and controls its speed and also drives the contacts of the switches 8, 37 so that they follow the movements of the contact arms. The transmitter 4 driven by the controlled element tends to restore the contact arms to normal position as the position of agreement is approached and during this restoring action the contact switches 8, 37 effect a reversal of direction of the motor 31 which then restores the regulator 10 and reverses the direction of follow-up of the switch contacts. When disagreement is completely eliminated, the apparatus is restored to the position shown and the motor 30 is switched off. An auxiliary hand-controlled regulator may be switched in in place of the regulator 10 to facilitate local control of the motor 30. The Specification as open to inspection under Sect. 91 describes a system wherein the regulator 10 is dispensed with and the motor 30 is controlled by the switches through the intermediary of relays. This subject-matter does not appear in the Specification as accepted.