Sealing device

Details Sealing device Sealing device

1999-12-30

2001-10-16

Mah, Chuck Y. (Department: 3626)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S574000, C277S551000

Reexamination Certificate

active

06302404

ABSTRACT:

This application is based on and claims priority under 35 U.S.C. § 119 with respect to Swedish Patent Application No. 9804613-9 filed on Dec. 30, 1998, the entire content of which is incorporated herein by reference.
FIELD OF THE INVENTION
The present invention generally relates to a sealing device. More particularly, the present invention pertains to a sealing device for sealing off a slit-formed space between two radially extending surfaces arranged around a shaft and axially displaceable relative to each other along the shaft.
BACKGROUND OF THE INVENTION
Sealing devices for sealing off a slit-formed space between two radially extending surfaces arranged on a shaft are known in a plurality of different designs. These earlier designs have been rather complex and/or have required a certain skill at mounting the sealing device in a manner appropriate for giving the best possible sealing effect.
A need thus exists for a sealing device of this type which is simple in design and to relatively easy install, and yet which is very efficient.
SUMMARY OF THE INVENTION
In light of the foregoing, one aspect of the present invention relates to a sealing arrangement that includes a shaft and two radially extending surfaces arranged about the shaft in an axially displaceable manner relative to each other along the shaft, a first sleeve-shaped seal part and a sealing body. The first sleeve-shaped seal part extends around the shaft and forms together with the shaft a space facing one of the radially extending surfaces. The resilient sealing body is positioned in the space for being compressed from an uncompressed state to a compressed state. The cross-sectional area and/or shape of the sealing body is different from the cross-sectional area and/or shape of the axially open space when the sealing body is uncompressed. The sealing body is sealingly compressed within the axially open space and against the one radially extending surface when subjected to axial forces causing the sealing body to abut against the one radially extending surface to thereby create a sealing engagement against the one radially extending surface and against the shaft.
Another aspect of the invention relates to a sealing device for sealing off a slit-shaped space between two radially extending surfaces that are arranged about a shaft in an axially displaceable manner relative to each other along the shaft. The device includes a first sleeve-shaped seal part forming together with the shaft an axially open space facing one of the radially extending. The device further includes an elastically resilient sealing body having in an uncompressed state a cross-sectional area different from the cross-sectional area of the axially open space and/or a shape different from the shape of the axially open space so that the sealing body, when subjected to axial forces causing a surface of the sealing body to abut against the one radially extending surface, is compressed sealingly between the axially open space and the one radially extending surface to thereby create a sealing engagement against an entrance of the slit-shaped space and against the shaft.


REFERENCES:
patent: 3114558 (1963-12-01), Rhoads et al.
patent: 5553866 (1996-09-01), Heinzen
patent: 40 18 796 (1990-06-01), None
patent: 2 137 702 (1984-03-01), None

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