Pistonless-plunger positioner with internal cylinder and annular

Details Pistonless-plunger positioner with internal cylinder and annular Pistonless-plunger positioner with internal cylinder and annular

1987-04-13

1989-04-25

Garrett, Robert E.

Spring devices

Vehicle

Comprising compressible fluid

188300, F16F 932

Patent

active

048240818

ABSTRACT:
A gas cylinder for applications requiring height adjustments such as found in chairs, stools, or like structures supported by columns. The cylinder has an elongated rechargeable unit of double-wall construction provided with a springless check valve inside a fluid port thereof preferably all of molded plastic. A single-piece sealed plunger assembly includes a single actuating rod with velocity controls incorporated therein which permit vertical extension from collapsed to fully-extended positions. Depression of the actuating rod allows circulation of the pressurized fluid between the chambers, with pressure force acting to extend the plunger when the unit is unloaded. When the unit is loaded, the plunger can be retracted.

REFERENCES:
patent: 1294014 (1919-02-01), Worster
patent: 2912002 (1959-11-01), Miller
patent: 3177980 (1965-04-01), Porter
patent: 3343833 (1967-09-01), Fader
patent: 3359802 (1967-12-01), Sollenberger
patent: 3420341 (1969-01-01), Keehn, II
patent: 3656593 (1972-04-01), Bauer
patent: 3762514 (1973-10-01), Freitag
patent: 3920253 (1975-11-01), Bauer
patent: 4036335 (1977-07-01), Thompson
patent: 4113220 (1978-09-01), Godwin
patent: 4257582 (1981-03-01), Wirges
patent: 4526088 (1985-07-01), Reuschenbach
patent: 4570669 (1986-02-01), Pauliukonis
patent: 4667780 (1987-05-01), Pauliukonis

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