Spring devices – Fluid – Expansible-contractible chamber device
Patent
1990-06-21
1992-07-14
Oberleitner, Robert J.
Spring devices
Fluid
Expansible-contractible chamber device
267 6426, 18832217, F16F 936, F16F 902
Patent
active
051296357
ABSTRACT:
A gas spring which provides two stages of resistance to axial movement, by a first head and rod slidably disposed within a second rod with a head, with both of the heads subjected to pressurized gas in a common chamber within the cylinder. Preferably, a seal for each provides sealing engagement when the force of pressurized gas acts upon the seal. Hence, the seal provides sealing engagement without being axially compressed and radially expanded. The seal may be used in single stage and two stage gas springs. Desirably, a positive stop for each rod is provided, preferably as a part of the housing for its bearings and seal. Preferably, the seal is a flexible annular sealing element which when viewed in cross section is generally a C-shape, with arms constructed and arranged so that the free edges of the seal are biased into sealing engagement by pressurized gas acting on the arms.
REFERENCES:
patent: 1288937 (1918-12-01), Leinweber
patent: 3797366 (1974-03-01), Hanes et al.
patent: 4508356 (1985-04-01), Janian
patent: 4792128 (1988-12-01), Holley
patent: 4896866 (1990-01-01), Legrand et al.
Muratori Alfred
Oberleitner Robert J.
Power Components Inc.
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