Hydraulic circuit for hoisting fluid ram

Details Hydraulic circuit for hoisting fluid ram Hydraulic circuit for hoisting fluid ram

1977-10-25

1978-10-10

Makay, Albert J.

B60P 300

Patent

active

041192281

ABSTRACT:
A straddle carrier including a spreader in a bay that is raised and lowered by two fluid rams cooperating with opposite ends of the spreader is disclosed herein. The hydraulic circuit supplying fluid to the fluid rams includes a valve that prevents flow of hydralic fluid from the rams when the conduits leading to the rams are not pressurized but also includes an electrically actuated valve that allows the spreader to be lowered without hydraulic power.

REFERENCES:
patent: 3472125 (1969-10-01), Noble
patent: 3703243 (1972-11-01), Monk
patent: 3960286 (1976-06-01), Spooner et al.

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