Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Reexamination Certificate
1999-10-25
2001-06-05
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
C060S481000
Reexamination Certificate
active
06240726
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a jack device. More particularly, the present invention relates to a hydraulic jack device which can be operated efficiently.
A conventional hydraulic jack cannot be lifted very fast. The user should operate the conventional hydraulic jack for about forty strokes of a pump before the conventional hydraulic jack reaches a lifted article.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a hydraulic jack device which can be operated efficiently.
Accordingly, a hydraulic jack device comprises a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat. A hydraulic shaft is inserted through the hydraulic cylinder and connected to the rocking arm. The rocking arm is connected to the lifting seat. The pump has a main body connected to the hydraulic cylinder, a chamber formed in the main body, a protruded block disposed on the main body, a piston cylinder disposed on a top portion of the main body, a piston disposed between the main body and the piston cylinder, and a C-shaped ring disposed on a top portion of the chamber to fasten a driven rod. The driven rod has a round end and a hollow box end. The piston cylinder has a hexagonal hole receiving a coiled spring. The piston has a round hole. The driven rod passes through the hexagonal hole of the piston cylinder, the coiled spring, and the round hole of the piston. The round end of the driven rod is inserted in the chamber. A first oil channel is formed in the hydraulic cylinder to communicate with the chamber. A second oil channel is formed in the hydraulic cylinder to communicate with the piston cylinder. The handle has a connection end engaging with the protruded block.
REFERENCES:
patent: 5755099 (1998-05-01), Hung
Kai Hsiang Enterprise Co., Ltd.
Kamrath Alan D.
Leslie Michael
Look Edward K.
Rider Bennett Egan & Arundel LLP
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