Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1988-12-05
1990-07-03
Kashnikow, Andres
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
188282, 188316, 474 80, 474 82, F16F 934, F16H 900
Patent
active
049383248
ABSTRACT:
An automatic derailleur shifter is disclosed which includes a hollow cylinder body and a piston rod movable within the cylinder. The piston rod carries a dual element piston within the cylinder body in a manner to permit substantially unrestricted fluid flow through the piston when the piston rod is moved in a first, upward direction and a greatly restricted fluid flow when the piston rod is moved in the second downward direction. A first, fixed piston element is fabricated of diameter less than the inner diameter of the cylinder to allow unrestricted fluid flow thereabout. A second, movable piston element is provided and below the fixed piston element includes a flared skirt for sliding, sealing engagement between the movable piston element and the cylinder. A small, restricted longitudinal channel is provided through the fixed piston element which terminates at its lower end at a circular channel. The circular channel is downwardly closed to form a restricted hydraulic fluid passage when the movable piston element is urged against the fixed piston element of the piston rod in the second direction to thereby restrict the speed of piston rod movement in the second direction.
REFERENCES:
patent: 2405062 (1946-07-01), Sheldon
patent: 2507268 (1950-05-01), Patriquin
patent: 4036319 (1977-07-01), Andre
patent: 4474271 (1984-10-01), Molders et al.
patent: 4503951 (1985-03-01), Imaizumi
patent: 4599072 (1986-07-01), Chappell
patent: 4662486 (1987-05-01), Stenberg
Bike-O-Matic, Inc.
Graham Matthew C.
Kashnikow Andres
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