Low noise linear actuator

Details Low noise linear actuator Low noise linear actuator

2006-09-12

2006-09-12

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Valved piston

C092S18100P

Reexamination Certificate

active

07104180

ABSTRACT:
A linear actuator system including a cylinder, a piston slidably received within the cylinder and defining a piston chamber and a rod chamber in the cylinder, wherein the piston includes a plurality of orifices therethrough that place the piston chamber and the rod chamber in fluid communication, and a sealing member movable between a closed position, wherein the sealing member restricts fluid flow through at least one of the plurality of orifices, and an open position, wherein the sealing member is less restrictive of fluid flow through the orifices. The plurality of orifices may include an always-open orifice that is not blocked by the sealing member when the sealing member is in the closed position.

REFERENCES:
patent: 4484669 (1984-11-01), Kato
patent: 4624347 (1986-11-01), Mourray
patent: 5332069 (1994-07-01), Murakami
patent: 5529154 (1996-06-01), Tanaka
patent: 6053486 (2000-04-01), Schuitema et al.
patent: 6247563 (2001-06-01), De Carbon et al.
patent: 6749035 (2004-06-01), Bundy

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