Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1986-09-15
1987-12-15
Shoap, Allan N.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277176, 277190, 277198, 277201, 277205, F16J 1546, F16J 1556
Patent
active
047128011
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a sealing gasket designed to act between two, a first and second, cylindrical components capable of being displaced telescopically into one another. The gasket is arranged to be kept stationary in relation to one of the components by an annular flange or similar support.
A gasket of this kind has an application in, for example, hydraulic or pneumatic cylinder/piston assemblies and in gas springs. These often operate in a dirty environment and are subject to stresses resulting from their intensive use, which leads to wear, consequent lack of sealing, and malfunctions. The gaskets are often designed to be adjustable for compensation of permitted wear. It is obvious that such adjustment leads to costs being incurred not only as a result of the adjustment operation itself, but also as a result of the stoppages and the associated lost production, which may be necessary in order to permit the adjustments to be made.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a sealing gasket which is self-adjusting. The gasket comprises first and second concentric sealing rings arranged at a certain distance from one another and an annular piston arranged in the space between the rings. The sealing devices situated closest to the aforementioned first component have a generally rectangular or square cross-section with boundary surfaces which are cylindrical from the radial viewpoint or as viewed in cross-section along a longitudinal axis. The rectangular-shaped sealing devices have a `U`- or `V`-shaped radial annular groove, which groove is concave into the seal from the surface of the ring facing away from the annular flange. The second sealing ring has a cylindrical boundary surface making sealing contact with the second component, which moves relative to the sealing gasket. The second sealing ring has an annular surface which rests against the annular flange, and a boundary surface extending between the annular surface and the cylindrical boundary surface, which boundary surface approaches the cylindrical boundary surface approximately in the form of a parabola and terminates at a sharp point when viewed in a radial section. The annular piston has a generally wedge-shaped cross-section as its boundary surface, which makes contact with the first sealing ring, is of cylindrical form, while its opposite boundary surface in contact with the second sealing ring is a curved form fitting or conforming to the boundary surface of the second sealing ring.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described below in more detail with reference to the accompanying radial section drawing, where
FIG. 1 shows one design of the sealing gasket forming a seal against a moving piston rod, and
FIG. 2 shows the gasket forming a seal against a moving cylinder.
DETAILED DESCRIPTION OF THE INVENTION
The designation 1 is used in the drawing to indicate a sealing gasket, and the designations 2 and 3 indicate two, a first and second, cylindrical components, which are capable of being displaced telescopically relative to one another. The sealing gasket 1 contacts and is kept stationary in relation to the first component 2 by an annular flange 4 attached to or integrated with the first component 2. The sealing gasket or gasket assembly comprises two concentric sealing rings 5, 6 of an elastic material arranged at a certain distance from one another to provide a space 7 between them. An annular piston 8 of a rigid material is positioned and operable inside space 7. Rigid material piston 8 is relatively harder than the elastic material sealing rings.
Sealing ring 5 contacts fixed first component 2, which is fixed relative to the sealing gasket, and exhibits a generally rectangular or square cross-section. Sealing ring 5 has, as viewed radially, cylindrical boundary surfaces 9, 10, and annular surface 11. Boundary surface 9 contacts the corresponding cylindrical surface of the component 2 and annular surface 11 contacts the annular flange 4. `U`- or
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patent: 4116452 (1978-09-01), Schanz
patent: 4252331 (1981-02-01), Siegel
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