Hydraulic counterweight and shock-absorbing system

Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber

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188303, 267 11A, F16F 922

Patent

active

040918971

ABSTRACT:
A hydraulic counterweight and shock-absorbing system for unbalanced loads comprises a hydraulic cylinder having a reciprocable piston attached to a rod which controls the position of the load. The hydraulic cylinder is filled with a hydraulic liquid and is provided with a valved by-pass conduit which is selectively operable to permit free movement of the piston in a "free-wheeling" mode. An accumulator partially filled with hydraulic liquid under a high-pressure gas phase is operatively connected to the rod end of the cylinder to provide a shock-absorbing function during a "hook-up" mode. In a "disconnect" mode, by-pass conduits provided with a check-valve and with a relief or pressure-controlled valve permit unimpeded upward movement of the load in response to an external applied force, but prevent downward movement of the load except on application of a force exceeding the weight of the load.

REFERENCES:
patent: 2997146 (1961-03-01), Edwards et al.
patent: 3277791 (1966-10-01), Williams et al.

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