Hydraulic actuator

Details Hydraulic actuator Hydraulic actuator

2007-05-08

2007-05-08

Leslie, Michael (Department: 3745)

Expansible chamber devices

With toothed gear, spline or thread rigid with working member

C092S108000

Reexamination Certificate

active

11119625

ABSTRACT:
This invention is a bi-directional hydraulic actuator comprising a piston assembly positioned within a housing. The piston assembly is configured to move linearly within the housing. A gland is operatively connected to the piston assembly. The gland is configured as a rigid longitudinally annular member with a first end, a second end, a sidewall and is open on the first end and substantially closed on the second end which forms an inside and an outside of the annular member. The gland is further configured with a lip extending from around the outside of the first end of the gland. A pressurizing fluid exerts pressure on the inside of the gland to move the piston assembly a first direction, then, a fluid exerts pressure on the outside of the gland and the lip of the gland to move the piston assembly opposite the first direction.

REFERENCES:
patent: 899795 (1908-09-01), Osmer
patent: 2678518 (1954-05-01), Honiss
patent: 2959156 (1960-11-01), Dreptin
patent: 3299782 (1967-01-01), Sunday
patent: 4773812 (1988-09-01), Bayne et al.
patent: 6626055 (2003-09-01), Magaribuchi
Picture of prior art grabber with exposed gears and cylinder.
Picture of prior art grabber with rollers.

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