Lifting apparatus with hydraulic operated means to move a counte

Details Lifting apparatus with hydraulic operated means to move a counte Lifting apparatus with hydraulic operated means to move a counte

1973-11-21

1976-03-23

Spar, Robert J.

Traversing hoists

Overhead

Cable

212 49, 91442, B66C 2372, B66F 900

Patent

active

039455181

ABSTRACT:
A hydraulic circuit for moving a heavy article or counterweight is provided which includes a cylinder, a source of hydraulic pressure for supplying oil to the cylinder, and a bypass valve provided in a conduit for connecting the source to the cylinder. The bypass valve drains part of the oil supplied to the conduit when the pressure in the conduit drops below a predetermined value so as to smoothly move the heavy weight from first position to second position without shock.

REFERENCES:
patent: 2474681 (1949-06-01), Lane
patent: 2811136 (1957-10-01), Westcott et al.
patent: 3236391 (1966-02-01), Kennedy
patent: 3265218 (1966-08-01), Stefanutti

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