Foley & Lardner, Schwartz, Jeffery, Schwaab, Mack, Blumenthal & Evans
Control for load carrier for industrial vehicle
 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. 
Nissan Motor Company, Limited
B
B66F
inventional
Hideki
Ito