Lengthwise-adjustable gas spring

Details Lengthwise-adjustable gas spring Lengthwise-adjustable gas spring

1975-07-30

1976-06-29

Blunk, Evon C.

Spring devices

Fluid

Expansible-contractible chamber device

188300, 248400, 267 65R, F16F 934

Patent

active

039661822

ABSTRACT:
A lengthwise-adjustable, compressed-gas-filled gas spring, particularly for continuous height adjustment of chairs, seats, tables, or the like, has two cylinders, coaxially mounted one inside the other, and leaving an annular chamber therebetween. A piston and piston rod are displaceably provided within the inner cylinder, the piston sealingly dividing the cylinder into a first housing chamber, on the piston rod side, and a second housing chamber. The piston rod extends sealingly out of the cylinders. The first housing chamber has a fluid connection to the annular chamber at all times. The inner cylinder has a passageway therethrough near the end opposite the piston rod end, and is axially displaceable within the center cylinder between a first position at which the passageway is sealed off and a second position at which a fluid connection is allowed between the second housing chamber and the annular chamber.

REFERENCES:
patent: 3171643 (1965-03-01), Roos
patent: 3711054 (1973-01-01), Bauer
patent: 3825244 (1974-07-01), Bauer
patent: 3837704 (1974-09-01), Bauer

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