Hydraulic jack with lowering control means

Details Hydraulic jack with lowering control means Hydraulic jack with lowering control means

2006-10-04

2011-11-29

Wilson, Lee D (Department: 3727)

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

C254S00200C, C254S0930VA, C254S08900R

Reexamination Certificate

active

08066259

ABSTRACT:
A hydraulic jack comprising a hydraulically actuated saddle movable from a first lowered position to a second raised position, the jack having a handle which, when pumped up and down, hydraulically raises the saddle, lowering control means associated with the jack for preventing premature lowering of the saddle upon malfunction of the hydraulic actuation during raising of the saddle and a release lever engaging the lowering control means adapted to release the same and permit lowering of the saddle when the handle is pumped up and down.

REFERENCES:
patent: 2114788 (1938-04-01), Tibbetts
patent: 4289299 (1981-09-01), Kameda
patent: 4505167 (1985-03-01), Nicolaus
patent: 5221073 (1993-06-01), Shockley
patent: 5618029 (1997-04-01), Chung
patent: 6685177 (2004-02-01), Dugas et al.

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