Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1993-03-17
1995-05-09
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
18832213, F16F 946
Patent
active
054131960
ABSTRACT:
According to an illustrative example of the present invention an oscillation damper is provided with a bypass interconnecting two fluid chambers. A main valve is provided within this bypass for allowing variation of the damping behavior of the oscillation damper. An electro-magnetic valve is used for controlling the hydraulic pressure acting onto the main valve. The electro-magnetic valve is biased toward an emergency position. The biasing force is obtained by two parallel acting springs. A first one of these springs is relatively weak, so that the valve can be transferred by low electric current in a magnetic coil against the action of the weak spring to a first operational position to be used during a major part of the operational time of the oscillation damper. By considerable increase of the electric current the valve can be further transferred into a further operational position which is desired only in exceptional situations. Therefore, a low electric energy consumption is needed for the control of the electro-magnetic valve. The normal operational condition of the electro-magnetic valve is stabilized by the second, harder spring.
REFERENCES:
patent: 4946009 (1990-08-01), Knutson
patent: 5035306 (1991-07-01), Ashiba
patent: 5085299 (1992-02-01), Spiess et al.
patent: 5180039 (1993-01-01), Axthammer et al.
patent: 5301412 (1994-04-01), Hahn et al.
patent: 5303804 (1994-04-01), Spiess
Fichtel & Sachs AG
Oberleitner Robert J.
Schwartz Chris
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