Telescopic hydraulic hoist apparatus

Details Telescopic hydraulic hoist apparatus Telescopic hydraulic hoist apparatus

1997-07-28

1999-11-16

Denion, Thomas E.

Expansible chamber devices

Mutually relatively movable cylinder or sleeve, member...

Cylinder or sleeve forms working member

92 51, 92 53, 92 79, 92 85B, F01B 720

Patent

active

059837780

ABSTRACT:
A telescoping hydraulic hoist formed from a non-corrosive material provides bearings and hydraulic seals about the bottom portion of each intermediate moving stage. The bearings and hydraulic seals are thus always maintained within the hoist and are not exposed to dust or particulate matter from outside the hoist. Air flows into and out of the air spaces between adjacent stages through air breathers. The hoist may also include variable length stroke limiters, and a cushion member which partially closes off the hydraulic inlet as the innermost stage is fully retracted to slow the hoist motion in the final stages of retraction.

REFERENCES:
patent: 3958376 (1976-05-01), Campbell
patent: 4471944 (1984-09-01), Leray
patent: 4928488 (1990-05-01), Hunger
patent: 5322602 (1994-06-01), Sims
patent: 5390586 (1995-02-01), Jones
patent: 5400695 (1995-03-01), Walker
patent: 5562393 (1996-10-01), Focke et al.

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