Spring devices – Vehicle – Bolster
Patent
1983-06-17
1986-06-17
Frinks, Ronald L.
Spring devices
Vehicle
Bolster
188274, 188282, 188285, 188317, 18832221, 267 8B, 267 6428, 623 26, 623 39, F16F 910, B60G 1300, B60G 1500, A61F 272
Patent
active
045951799
ABSTRACT:
A hydraulic damping unit, particularly for use in artificial joints. The unit includes a cylinder housing having a screw-in bottom part. A hollow piston is guided in the housing and has on its jacket a shoulder which delimits with corresponding flanges on the inner wall of the housing two chambers of variable volume for storing a hydraulic liquid. A hollow throttling piston is guided in the main piston and is formed with an annular recess which communicates with respective variable volume chambers via passages passing through the jacket of the main piston at both sides of the shoulder. In the range of both passages, the bottom of the recess of the throttling piston is connected to the outer surface of the latter via a sloping annular surface which, depending on the relative position of the throttling piston to the main piston, adjusts the clearance of the passages to control the resistance to flow of the hydraulic liquid. A set screw is arranged in the main piston opposite the end face of the throttling piston to adjust its axial position, and a counteracting return spring is arranged inside the throttling piston. Disclosed is also an artificial joint provided with the above hydraulic damping device. The lower part of the joint has a fork-shaped configuration, and the cylinder housing of the damping device is formed with pivot pins journalled in the opposite walls of the lower part. The main piston is linked to the upper part of the joint at a point which, in the aligned position of the upper and lower parts, is below the hinge axle of the joint.
REFERENCES:
patent: 1700044 (1929-01-01), Hales
patent: 1948185 (1934-02-01), Padgett
patent: 2213823 (1940-09-01), Renfer
patent: 2533008 (1950-12-01), Hanson
patent: 3128088 (1964-04-01), Paschakarnis
patent: 3240355 (1966-03-01), Karbowniczek
patent: 3316558 (1967-05-01), Mortensen
patent: 3837292 (1974-09-01), Wiebe
patent: 4212087 (1980-07-01), Mortensen
patent: 4318535 (1982-03-01), Imai
Frinks Ronald L.
Otto Bock Orthopadische Industrie KG
Striker Michael J.
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