Gas spring with automatic locking mechanism

Details Gas spring with automatic locking mechanism Gas spring with automatic locking mechanism

1977-12-07

1980-10-28

Halvosa, George E. A.

Spring devices

Fluid

Expansible-contractible chamber device

16 66, 160189, 160192, 188282, 188284, 188288, 188300, 267 64R, 267 65R, 267124, 296 56, F16F 902, F16F 906

Patent

active

042303095

ABSTRACT:
A gas spring includes a cylinder having two axial portions of different cross section and two pistons mounted on a common piston rod and respectively matching the cross sections of the cylinder portions. The pistons are spaced on the piston rod so that they are either both in the wider cylinder portion or respectively received in the two portions. A first throttling passage permits flow of fluid between the two cylinder compartments separated by the larger piston, and a second throttling passage by-passes the smaller piston only during movement inward of the smaller cylinder portion to permit flow of fluid out of that cylinder portion. A valve arrangement is biased for sealing the two parts of the cylinder cavity separated by the smaller piston when the latter is in the smaller cylinder portion, but does not move inward of that portion. The valve arrangement responds to a sufficient, axially applied force for connecting the two cavity parts.

REFERENCES:
patent: 2920338 (1960-01-01), Falk
patent: 3147966 (1964-09-01), Axthammer et al.
patent: 3307597 (1967-03-01), Shugarman
patent: 3447644 (1969-06-01), Duckett
patent: 3598205 (1971-08-01), Kenyon
patent: 3722920 (1973-03-01), Reese
patent: 3865356 (1975-02-01), Wossner
patent: 3963227 (1976-06-01), Molders

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