Axially adjustable pneumatic spring

Details Axially adjustable pneumatic spring Axially adjustable pneumatic spring

1980-01-23

1982-03-09

Clements, Gregory N.

Spring devices

Vehicle

Comprising compressible fluid

188284, 188300, F16F 948

Patent

active

043185363

ABSTRACT:
A pneumatic spring for use, for example, as a lifting device or support strut for a chair or the like with provision for the adjustment of axial extent. The pneumatic spring is substantially composed of a telescoping cylinder-piston assembly containing a gas and/or fluid under compression. A releasable valve assembly permits the relative position of the piston with respect to the housing to be adjusted arbitrarily. In order to provide for a terminal spring stiffening in the position of near full insertion of the piston rod, the invention provides that a pin extending from the main piston enters a central volume which is thereby sealed off from the remainder of the internal volume. Accordingly, the gas in the remaining available volume is compressed more highly and exerts an increased opposing force on the primary piston during its final insertion.

REFERENCES:
patent: 3656593 (1972-04-01), Bauer
patent: 3711054 (1973-01-01), Bauer

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