Hydraulic hand pump with locking device

Details Hydraulic hand pump with locking device Hydraulic hand pump with locking device

2008-01-08

2008-01-08

Lazo, Thomas E. (Department: 3745)

Expansible chamber devices

With releasable stop or latch means to prevent movement of...

Means includes element interfitting between working member...

C092S015000

Reexamination Certificate

active

11396678

ABSTRACT:
A method and apparatus is provided that includes a hand pump having a handle locking mechanism, a counter bored nut, pivoting links, and unloading valve assembly. The unloading valve assembly allows a pump operator to pump a larger volume of hydraulic fluid and/or to pump to higher pressures in first stage operation than a conventional pump which employs a direct-acting relief valve. The unloading valve also decreases the effort required to pump the handle during second stage operation. The handle locking mechanism allows the pump handle from moving during transporting and storing of the hand pump. The counter bored nut allows for more reservoir room than conventional hand pumps. The pivoting link allows for greater leverage of the handle during pumping.

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patent: 6250205 (2001-06-01), Chuang
patent: D463452 (2002-09-01), Soderqvist

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