Closed center hydraulic valve control system for aerial lift

Details Closed center hydraulic valve control system for aerial lift Closed center hydraulic valve control system for aerial lift

1986-09-04

1988-03-15

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91 51, 91444, 91461, 13759612, 1376256, 1375135, 212162, F15B 1108

Patent

active

047305436

ABSTRACT:
Apparatus for controlling operation of an aerial lift having a boom. A hydraulic fluid pump is connected to a hydraulic cylinder, and the control arrangement controls the supply of hydraulic fluid from the hydraulic fluid pump to the cylinder and controls the supply of hydraulic fluid pressure to a first pilot fluid port and to a second pilot fluid port of a pilot operated control valve to control operation of the pilot operated control valve. A first hydrulic fluid conduit operably connects the hydraulic fluid pump to a first pilot fluid port, and a second hydraulic fluid conduit operably connects the hydraulic fluid pump to a second pilot fluid port of said control valve. A control handle selectively vents hydraulic fluid from the first fluid conduit and the second fluid conduit to control fluid pressure at the pilot ports.

REFERENCES:
patent: 2946196 (1960-07-01), Myers
patent: 3340897 (1967-09-01), Nevulis
patent: 3805674 (1974-04-01), Sebesta et al.
patent: 3931830 (1976-01-01), Gritz
patent: 4350078 (1982-09-01), Olofsson
patent: 4427121 (1984-01-01), Clements
patent: 4487106 (1984-12-01), Field
patent: 4508014 (1985-02-01), Shoff
patent: 4509406 (1985-04-01), Melocik
patent: 4542768 (1985-09-01), Harris

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