Pneumatic spring counterbalance having improved damping structur

Details Pneumatic spring counterbalance having improved damping structur Pneumatic spring counterbalance having improved damping structur

1982-10-08

1986-02-18

Reger, Duane A.

Spring devices

Vehicle

Comprising compressible fluid

188284, 18832222, 267124, B60G 1126

Patent

active

045709122

ABSTRACT:
A pneumatic spring counterbalance extensible link including a closed end cylinder with an end connector, a piston and rod assembly within the cylinder and maintained therein by the crimped over end portion of the cylinder retaining a rod bushing and rod to cylinder seal assembly. The cylinder is pressurized preferably prior to assembly of the bushing and seal assembly into the cylinder. The piston assembly includes an effective check valve and orifice by-pass structure for metered gas flow past the piston in one direction and free flow past the piston in the other direction of piston movement. A small predetermined amount of oil is contained in the cylinder and provides lubrication for the seals and piston and provides a damping effect at the end of the extension stroke. A standpipe sleeve is secured on the piston extending toward the seal assembly around the piston rod and controls disposition of the oil to assure damping at the end of the extension stroke. A piston and piston ring structure enhance reliability of control of the oil flow, by providing a peripheral piston to cylinder seal and assures that fluid only passes across the piston via the check valve and orifice by-pass structure in the piston.

REFERENCES:
patent: 2818942 (1958-01-01), Bliven
patent: 3003596 (1961-10-01), Carbon
patent: 3272494 (1966-09-01), Lucien et al.
patent: 4221367 (1980-09-01), Smith

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