Hydraulically blockable gas spring

Details Hydraulically blockable gas spring Hydraulically blockable gas spring

1990-01-23

1991-02-19

Olszewski, Robert P.

Brakes

Internal-resistance motion retarder

Using diverse fluids

188299, 188300, 267 6412, F16F 906, F16F 946

Patent

active

049935224

ABSTRACT:
In a hydraulically blockable gas spring a hydraulic chamber and a gas chamber are provided one behind the other within a cylinder. The chambers are separated from each other by a separating wall. A first section of a piston rod is sealingly guided through one end of the hydraulic fluid chamber and is connected with a separating piston within the hydraulic fluid chamber. The separating piston divides the hydraulic fluid chambers into two hydraulic fluid compartments. The fluid compartments are interconnected by a hydraulic flow path. The hydraulic flow path can be selectively opened and closed by a valve. A second piston rod section extends from the separating piston through the separating wall and sealingly enters into the gas chamber. The pressurized gas within the gas chamber provides a biasing action onto the second piston rod section. The hydraulic chamber is completely filled with a hydraulic fluid. When the valve is closed, the separating piston and the piston rod sections are positively blocked in both axial directions. When the valve is open, the separating piston and the piston rod sections can be moved as a unit and are subject to the biasing action of the pressurized gas.

REFERENCES:
patent: 3388883 (1968-06-01), Axthammer et al.
patent: 3426651 (1969-02-01), Arendarski
patent: 3979109 (1976-09-01), Ishida
patent: 4373707 (1983-02-01), Molders
patent: 4709790 (1987-12-01), Freitag et al.
patent: 4784375 (1988-11-01), Wirges
patent: 4785921 (1988-11-01), Hosan et al.

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