Spring devices – Fluid – Expansible-contractible chamber device
Patent
1989-11-08
1992-02-18
Graham, Matthew C.
Spring devices
Fluid
Expansible-contractible chamber device
267130, F16F 902
Patent
active
050886983
ABSTRACT:
A gas spring comprising a cylindrical body having a base wall and an integral side wall with an open upper end defining a bore. The bore includes a lower cylindrical portion and an upper cylindrical portion of greater diameter than the lower cylindrical portion defining a shoulder. A piston of constant diameter is positioned in the bore and has a radial flange on its lower end with a wear bearing contacting the lower portion of the bore. An annular retainer is positioned on the shoulder and is adapted to be engaged by the flange on the piston. An annular end cap is threaded in the upper cylindrical portion of the bore and maintains the retainer against the shoulder. An annular lock nut is threaded in the upper portion of the bore and locks the end caps in position. Circumferentially spaced radial openings are provided adjacent the periphery of the lock nut for venting gas during disassembly if any gas remains. A charging valve and a rupture plug including pressure relief disc are provided in the base wall.
REFERENCES:
patent: 4550899 (1985-11-01), Holley
patent: 4583722 (1988-04-01), Wallis
patent: 4601461 (1986-07-01), Brough et al.
patent: 4664362 (1987-05-01), Hennells
patent: 4741518 (1988-05-01), Wallis
patent: 4742997 (1988-05-01), Wallis
patent: 4765227 (1988-08-01), Balazs et al.
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