Cylinder-piston device

Details Cylinder-piston device Cylinder-piston device

1988-07-11

1990-01-30

Garrett, Robert E.

Expansible chamber devices

With guide or seal on cylinder end portion for piston or...

277 3, 277 27, 267 6411, 267129, 18832217, F16J 1518

Patent

active

048965871

ABSTRACT:
In a gas spring the piston rod passes through a guide ring at one end of a container. On the inner side of the guide ring there are provided two sealing rings, a first axially outer sealing ring adjacent to the guide ring and a second axially inner sealing ring spaced from the first sealing ring. A working chamber is defined axially between the second sealing ring and the second end of the container. Pressurized gas is contained within the working chamber. An annular sealing chamber is defined axially between the first and the second sealing ring. Both sealing rings are provided with a respective radially inner sealing lip sealingly engaging the piston rod and a radially outer sealing lip sealingly engaging the container. Respective sealing lips are axially directed towards the sealing chamber. A volume of pressurized gas is contained within the sealing chamber. The pressure within the sealing chamber exceeds the pressure within the working chamber.

REFERENCES:
patent: 4070946 (1978-01-01), Sandvik et al.
patent: 4070947 (1978-01-01), Crewse
patent: 4108423 (1978-08-01), Skubal
patent: 4240619 (1980-12-01), Wirges et al.
patent: 4342447 (1982-08-01), Marx
patent: 4548389 (1985-10-01), Smith et al.
patent: 4588054 (1986-05-01), LeBaron
patent: 4613140 (1986-09-01), Knox
patent: 4736824 (1988-04-01), Dony et al.

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