Spring devices – Resilient shock or vibration absorber – Bumper
Reexamination Certificate
2002-08-09
2003-12-30
Butler, Douglas C. (Department: 3683)
Spring devices
Resilient shock or vibration absorber
Bumper
C213S223000, C213S043000, C188S269000, C188S314000, C267S064150, C267S116000, C267S115000
Reexamination Certificate
active
06669180
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a gas-hydraulic shock absorber assembly, particularly for push and/or pull devices of rail vehicles. It comprises a sleeve member, a ram member movable relative to the sleeve member, a gas chamber located in the sleeve member or in the ram member and adapted to be pressurized by means of a gaseous medium, and an oil chamber located in the ram member or in the sleeve member and containing a hydraulic medium.
Gas-hydraulic shock absorber assemblies to be used in push devices or pull devices of rail vehicles are well known in the prior art, for instance in the form of so-called bumpers. However, a shock absorber assembly designed according to the invention can also be used for example in couplings of rail vehicles, particularly couplings adapted to interconnect a plurality of rail vehicles.
In known gas-hydraulic shock absorber assemblies having no physical separation means to separate the gaseous and fluid media, the fundamental danger is present that gaseous medium collects in the fluid chamber after a certain period of use; of course, this is highly undesirable because it can impair the proper function of the shock absorber assembly, even lead to malfunction thereof. For example, too much gaseous medium in the fluid chamber can lead to an undefined or insufficient resilient behavior e.g. of a rail vehicle bumper. Particularly, if such a bumper is hit very hard, there is a high danger that gaseous medium enters the fluid chamber.
OBJECTS OF THE INVENTION
Thus, it is an object of the invention to provide a gas-hydraulic shock absorber assembly of the kind mentioned herein before which bleeds itself during its operation by automatically recycle any gaseous medium that may have collected in the fluid chamber to the gas chamber.
SUMMARY OF THE INVENTION
In order to meet this and other objects, the present invention provides a gas-hydraulic shock absorber assembly, particularly for push and/or pull devices of rail vehicles. It comprises a sleeve member, a ram member movable relative to the sleeve member, a gas chamber located in the sleeve member or in the ram member and adapted to be pressurized by means of a gaseous medium, and an oil chamber located in the ram member or in the sleeve member and containing a hydraulic medium.
Further, the shock absorber assembly comprises a gas-hydraulic control assembly arranged between the gas chamber and the oil chamber, and a bleeding assembly, incorporating a transfer channel opening into an upper portion of the oil chamber and providing a communication between the oil chamber and the gas chamber.
REFERENCES:
patent: 3252587 (1966-05-01), Scales
patent: 3731771 (1973-05-01), Borgo
patent: 4805517 (1989-02-01), Conley et al.
patent: 5845796 (1998-12-01), Miller
patent: 2003/0030198 (2003-02-01), Ziegler
patent: 0 133 157 (1985-02-01), None
patent: 001283142 (2003-02-01), None
patent: 001283143 (2003-02-01), None
Butler Douglas C.
Maginot Moore & Beck
Schwab Verkehrstechnik AG
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