Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Patent
1986-11-12
1988-10-04
Halvosa, George E. A.
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
16 56, 188316, 188318, 18832215, 623 39, F16F 920
Patent
active
047750375
ABSTRACT:
A hydraulic device for controlling the knee-joint function in a leg prosthesis has a cylinder which is divided into first and a second cylinder parts adapted to be fixed to the lower leg of the prosthesis, and a piston rod which carries one piston in each cylinder part and is fixed to the upper leg of the prosthesis. The pistons divide the interior of the respective cylinder parts into two chambers. The adjacent first chambers of the cylinder parts are interconnected by a throttle device. The two, second chambers are also interconnected. One piston has a sealing member which is of a single-acting type to allow leakage of hydraulic fluid from the second chamber to the first chamber when the piston is moved in a direction reducing the volume of the second chamber, while it is completely sealing when the piston is moved in the opposite direction. A connection is provided between one of the first chambers and one of the second chambers. A pressure relief valve is arranged for opening this connection when the pressure of the hydraulic fluid in the one first chamber exceeds a predetermined value.
REFERENCES:
patent: 1273059 (1918-07-01), Hild
patent: 2029829 (1936-02-01), Messier
patent: 2497972 (1950-02-01), Beecher
patent: 2543908 (1951-03-01), Guzey
patent: 2715389 (1955-08-01), Johnson
patent: 2912069 (1959-11-01), Dillenburger
patent: 3176801 (1965-04-01), Huff
patent: 3670341 (1972-06-01), Webb et al.
patent: 4099602 (1978-07-01), Kourbetsos
Halvosa George E. A.
Vaxjo-Protes AB
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