Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1990-07-10
1992-10-06
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277102, 277125, 277165, 277203, F16J 1524
Patent
active
051525372
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The seal according to the invention has particular application for use between two components which are capable of relative slidable movement with respect to each other. It has been recognised by the inventor that it is a requirement of such seals that they not only be resiliently flexible in order to be able to maintain intimate surface contact with one of the surfaces but that they also have a relatively low coefficient of sliding friction with the surface with which they are in contact and that they be wear resistant. In the past it has been found not to be possible to have all of these properties in a single element and therefore a number of compromises have to be met in order to achieve a satisfactory result.
It is an object of this invention to provide a seal which is able to maintain close intimate contact with a surface with which it is to be held in sealing engagement, has a relatively low coefficient of sliding friction and is durable.
SUMMARY OF THE INVENTION
In one form the invention resides in a seal for use between a pair of substantially concentric elements capable of relative movement with respect to each other said seal comprising a sealing element having the configuration of a helix and having a length in excess of one revolution of said helix wherein the opposed axial faces of the helix are of complementary configuration and are in close abutting relationship with each other said sealing element being formed of a rigid resilient wear resistant material having a low coefficient of sliding friction said sealing element being adapted to be supported from one element by a support means and being in close abutting relationship with the other element said support means including a clamping means for causing resilient compression of the seal axially and radially against the other element.
Throughout this specification and claims the term tube or tubular shall not be taken as being restricted to instances where the components are of a circular cross-section or where the inner and outer surfaces are of similar cross-sectional configuration.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully understood in the light of the following description of several specific embodiments. The description is made with reference to the accompanying drawings of which;
FIG. 1 is a sectional elevation of a first embodiment;
FIG. 2 is a part section elevation of a second embodiment;
FIG. 3 is a part sectional elevation of a third embodiment;
FIG. 4 is a sectional elevation of a fourth embodiment; and
FIG. 5 is a sectional elevation of a fifth embodiment
FIGS. 6a, 6b and 6c are sectional elevations of various seals which can be used in each of the embodiments.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
The first embodiment as shown in FIG. 1 relates to a seal which is used between a pair of concentric tubes 11 and 12 wherein the inner tube 12 is capable of slidable movement with respect to the outer tube 11. The inner tube 12 is supported in the outer tube 11 by a seal housing 13 which is received in one end of the outer tube 11 and is received concentrically between the inner tube 12 and outer tube 11. An O ring seal 14 is provided between the inner face of the outer tube 11 and the exterior face of the seal housing 13. The inner portion of the seal housing 13 is formed with a reduced diameter portion whereby the exterior face of the reduced diameter portion is spaced from the internal face of the outer tube 11. To seal the interface between the exterior face of the inner tube 12 and the seal housing 13 a seal 15 is utilised. As shown the seal 15 comprises a helix having at least one revolution. It is formed of a wear resistant resilient material which has a low co-efficient of sliding friction with the surface of the inner tube. In addition the wall thickness of the seal is greater than the reduced diameter portion of the seal housing 13 and the internal diameter of the seal in its unstressed position is less than the external diameter of
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Cuchlinski Jr. William A.
Cummings Scott W.
Dartnall Engineering & Innovation Pty. Ltd.
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