Fluid motor

Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...

Reexamination Certificate

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Reexamination Certificate

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07066074

ABSTRACT:
The piston of a fluid motor divides the cylinder into two variable volumes into which and from which fluid may be selectively introduced and exhausted via ports through the cylinder to relatively move the piston and the cylinder. The piston is modified to define two fixed-volume chambers that respectively communicate with the variable volumes via restrictive orifices. In selected relative piston-cylinder positions, the chambers communicate with the ports to restrict fluid flow into and out of the variable volumes and to decrease the velocity of relative piston-cylinder movement. In other relative piston-cylinder positions, the chambers do not communicate with the ports and fluid enters and leaves the variable volumes directly through the ports to relatively move the piston-cylinder at a higher velocity.

REFERENCES:
patent: 3592106 (1971-07-01), Baughman
patent: 4089251 (1978-05-01), Louviot
patent: 5018934 (1991-05-01), Steinkamp et al.
patent: 5657511 (1997-08-01), Lan
patent: 6000314 (1999-12-01), Masuda et al.
patent: 6230606 (2001-05-01), Sato

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