Multilevel speed regulation jack

Details Multilevel speed regulation jack Multilevel speed regulation jack

2006-05-09

2006-05-09

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

C060S477000

Reexamination Certificate

active

07040091

ABSTRACT:
A multilevel speed regulation jack includes an input oil cylinder, an output oil cylinder, and a fluid conduit member between the cylinders. The output oil cylinder includes a cylinder body containing an annular space and a tube piston, which fits in the annular space. A sliding sleeve of the tube piston is movably positioned in the annular space. An annular in-flow oil chamber is formed between the end annular surface of the tube piston and the cylinder body, and a central in-flow oil chamber is formed between the inner central surface of the piston and the cylinder body. The fluid conduit member includes at least two parallel fluid channels connected to the central in-flow oil chamber and the annular in-flow oil chamber, respectively. A control valve in one of the fluid channels opens/closes the channel. The jack can automatically switch between different jacking speeds based on the load sensed by the system and therefore has a high jacking efficiency.

REFERENCES:
patent: 5755099 (1998-05-01), Hung
patent: 6199379 (2001-03-01), Hung
patent: 2003/0136125 (2003-07-01), Hung
patent: 99209440.0 (2000-04-01), None

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