Linear actuator for rotating shaft assemblies

Details Linear actuator for rotating shaft assemblies Linear actuator for rotating shaft assemblies

2007-02-14

2009-10-20

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Piston with rigid axially extending hollow stem

Hollow stem forms axially extending fluid passage

C279S004010

Reexamination Certificate

active

07603943

ABSTRACT:
A linear actuator for a rotating shaft assembly includes a cylinder and a piston arranged within a cavity defined by the cylinder. Faces of the piston delimit first and second chambers within the cavity. A rotatable shaft fixed to the piston defines a first main passage in fluid communication with the first chamber and a second main passage in fluid communication with the second chamber. A pressure delivery body rotatably fixed to the rotatable shaft defines a first delivery passage in fluid communication with the first main passage and a second delivery passage in fluid communication with the second main passage. A passage isolation system selectively isolates fluid communication between the first delivery passage and the first main passage and fluid communication between the second delivery passage and the second main passage. A pressure limiting system selectively blocks fluid communication through the first and second main passages.

REFERENCES:
patent: 2679233 (1954-05-01), Liaaen
patent: 4945819 (1990-08-01), Rohm
patent: 5501137 (1996-03-01), Weichler
patent: 6257122 (2001-07-01), Michler et al.
patent: 6487957 (2002-12-01), Colimitra

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