Brakes – Internal-resistance motion retarder – Position of thrust member relative to chamber
Patent
1977-03-14
1978-01-31
Reger, Duane A.
Brakes
Internal-resistance motion retarder
Position of thrust member relative to chamber
188287, F16F 944
Patent
active
040711226
ABSTRACT:
A sleeve is rotatably mounted on the main body and the two define a reservoir cavity therebetween. Projections integral with the body extend radially through the reservoir cavity to contact the inner wall of the sleeve. Spaced axially along the cylinder are a plurality of openings which extend through the projections from the cylinder cavity to the outer end of the projections. On the inner wall of the sleeve in juxtaposition to the outer end of the openings are a plurality of generally annular grooves. The oil path or duct for release of oil from the cylinder cavity to the reservoir cavity when the piston moves inwardly is through the openings and those parts of the grooves at the distal ends of the projections. In one embodiment these grooves vary in cross-sectional size throughout their length. In another embodiment they are helical, at a slight angle to the axis of rotation. Thus as the sleeve is rotated the cross-sectional size of the oil path from the cylinder cavity to the reservoir cavity is varied thereby varying the resistance to flow of the hydraulic fluid.
REFERENCES:
patent: 3344894 (1967-10-01), Kenworthy
patent: 3478846 (1969-11-01), Germond
patent: 3510117 (1970-05-01), Scholin et al.
patent: 3840097 (1974-10-01), Holley
patent: 3998302 (1976-12-01), Schupner
Efdyn Corporation
Reger Duane A.
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