G - Physics – 05 – D
Patent
G - Physics
05
D
341/38, 341/97
G05D 3/14 (2006.01) B66C 13/18 (2006.01)
Patent
CA 1181834
ABSTRACT OF THE DISCLOSURE A remote control system for controlling the movement of manually operable mechanisms such as hydraulic control valves for hydraulically oper- ating the various cylinders on equipment such as cranes, or the like. A remote control unit includes a deadman switch and one or more potentiometers that provide control signals to a corresponding number of servo circuits. Each servo circuit drives a motor and a motor position sensing potentiometer that generates an error signal back to the servo. The motor rotation provides linear movement to the hydraulic control valve through a solenoid operated mechanical coupling, The servo circuit includes safety circuitry that detects open or shorted circuits in the cable to the remote unit and releases the solenoid coupling and returns the motor to a neutral position. When closed, the deadman switch diverts high pressure hydraulic fluid into the hydraulic systems so that, if desired, all hydraulic control valves may be preset to the desired position and, upon closing of the deadman switch, all preset hydraulic cylinders will become operative.
405615
Griffiths Edward E.
Richard Jean
LandOfFree
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