Material or article handling – Elevator or hoist and loading or unloading means therefor – Elevator wherein means comprises guide mounted for relative...
Patent
1988-03-11
1990-06-05
Spar, Robert J.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Elevator wherein means comprises guide mounted for relative...
91443, B65E 4700, F15B 1522
Patent
active
049309757
ABSTRACT:
In a load carrier controlling system a lift cylinder is subjected to the weight of a load carrier and is hydraulically extendable to lift the load carrier. A lift control valve is provided which is shiftable between a neutral position and a predetermined position wherein discharge of hydraulic fluid from the lift cylinder is allowed to permit a downward movement of the load carrier. A variable flow regulator is disposed between the lift cylinder and the lift control valve, the variable flow regulator having a first state which imparts a first degree of flow restriction to hydraulic fluid flow passing therethrough in one direction from the lift cylinder to the lift control valve, and a second state which imparts a second degree of flow restriction to the hydraulic fluid flow passing therethrough in the one direction. A solenoid is provided which is adapted to cause the flow regulator to shift between the first and second states, and a control circuit is provided which selectively energizes and deenergizes the solenoid in response to the downward movement of the load carrier.
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"Hydraulics and Pneumatics", 1972, Chapter Four, Velocity Servos, pp. 53-56.
"Hydraulics and Pneumatics", 1969, Jun., pp. 133-136 System Concepts, Chapter 12.
Katz Robert S.
Nissan Motor Company Limited
Spar Robert J.
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