Operator presence switch with service by-pass

Details Operator presence switch with service by-pass Operator presence switch with service by-pass

1987-09-18

1988-07-26

Look, Edward K.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

56 102, 60427, 60494, 180306, 180307, F16D 3102

Patent

active

047591854

ABSTRACT:
A control system for terminating the power input to the picking units of a cotton harvester after a short delay by automatically causing a hydrostatic drive to return to neutral. A seat switch and a delay timer electrically connected to a solenoid valve on a servo control system of the hydrostatic pump deactivates the servo system and returns the pump swashplate to a neutral position to stop the unit movement when the operator leaves his seat. Another switch connected in parallel with the operator seat switch is activable when the unit drive is in neutral making the system effective only when the picking units are engaged. A service bypass circuit is provided which, when the hydrostatic lever is in a special low speed position and when the main ground drive of the transmission is in neutral, permits the units to be operated at a relatively slow speed by depressing a remotely located switch.

REFERENCES:
patent: 3500946 (1970-03-01), Boyajian
patent: 3587765 (1971-06-01), McFarland
patent: 3633700 (1972-01-01), Matthews
patent: 3773156 (1973-11-01), Nyquist
patent: 3881317 (1975-05-01), Swoager
patent: 4055047 (1977-10-01), Hara
patent: 4167855 (1979-09-01), Knapp
patent: 4294327 (1981-10-01), Howard
patent: 4392544 (1983-07-01), Dilno
patent: 4573319 (1986-03-01), Chichester

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