Device for controlling the boom elevation of a side crane

Details Device for controlling the boom elevation of a side crane Device for controlling the boom elevation of a side crane

1974-03-14

1976-11-09

Cohen, Irwin C.

Traversing hoists

Overhead

Cable

91420, 91441, 91448, 91465, 13759612, B66C 2356, F15B 13042, F15B 1306

Patent

active

039905837

ABSTRACT:
A device for elevating the boom of a side crane has a double acting valve provided in a hydraulic circuit so as to permit natural lowering of the boom of the side crane under its own weight as well as forcible raising and lowering hydraulically, and also so as to maintain the boom without need of further fluid supply from a pump in its forcibly lowered or lifted state for a long period of time through the trapping of hydraulic fluid within the boom cylinders on both the lifting and lowering sides thereof.

REFERENCES:
patent: 3241461 (1966-03-01), Drone
patent: 3265218 (1966-08-01), Stefanutti
patent: 3381587 (1968-05-01), Parquet
patent: 3430540 (1969-03-01), Linz
patent: 3566903 (1971-03-01), Honeycutt
patent: 3595264 (1971-07-01), Martin

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