Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1983-03-25
1985-03-05
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277188R, 285 73, 285352, F16J 1534
Patent
active
045027013
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved fluid coupling and in particular it relates to a coupling of a type which can be attached to the end of a hose or a pipeline to allow the hose or pipeline to be coupled to a supply source or to another hose or pipeline, the coupling generally being of the snap action type and allowing for a resilient sealing ring at the face of the coupling adapted to engage a similar resilient sealing ring at the face of the member to which the coupling is being engaged.
In couplings of this type it has been customary to provide shaped lugs on a body which is adapted to be attached to the hose or pipeline and these lugs co-operate with sections of an adjoining coupling member to lock the two coupling members together axially when engaged, both members preferably being identically formed with lugs to engage the other member and with locking means to ensure that the couplings will not disengage at inappropriate times.
It is usual to form the rings in such couplings to fit into an annular recess formed in the end of the coupling near its front face, that is a face which is in use positioned adjacent to the corresponding face of the member to which coupling is being effected, the resilient member being in the form of a ring which protrudes beyond the front face of the coupling so that when two couplings are interengaged the resilient faces are pulled tightly together to form a seal at the joint.
One of the problems with couplings of this type is that when at low pressure they tend to leak unless correctly constructed and similarly when used at high pressure the resilient rings distort at the interengaging faces to allow the high pressure fluid to leak between the faces because in actual fact these rings become relatively fluid under high pressure and the material can either distort or flow out through the gap between the two faces of couplings being joined.
The object of the present invention is to provide certain improvements to couplings which will overcome both of the above disadvantages.
A further object is to provide a simple and effective construction which will be usable for both high and low pressure fluids and which will give an effective seal in both cases.
A further object is to provide an effective seal for the commonly known types of snap action couplings which have interengaging lugs to hold them together and depend on the pressure exerted on the two interengaging sealing rings to prevent leakage past the rings.
The objects of the invention are achieved by having the body of the coupling constructed as heretofore with an internal annular recess adjacent to the front face of the unit, and positioning in this annular recess a novel compound sealing ring shaped to engage the annular recess but to extend beyond the front face of the coupling, and placing over the projecting front face of a sealing portion of the compound sealing ring a rigid reinforcement portion of metal or the like which surrounds the resilient sealing portion at the area at least where it projects beyond the front face of the coupling so that when two such couplings are axially fitted together to apply the necessary pressure on the resilient sealing portions, the rigid reinforcement portions similarly are in close proximity or contact at their front faces to encase the projecting parts of the resilient sealing portions and prevent outward displacement when high pressure fluid is applied to the coupling, the resilient sealing portions being shaped to act somewhat as a diaphragm to allow the interengaging faces to accommodate themselves as the couplings are joined and during engagement carrying the rigid reinforcement portions with the front part of the resilient sealing portions to compensate for changes in dimension or irregularities in the lugs and interengaging members of the couplings.
To enable the invention to be fully understood an embodiment thereof will now be described with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a pair of separated complementary coupling memb
REFERENCES:
patent: 2132506 (1934-10-01), Allen
patent: 2154914 (1939-04-01), O'Day
patent: 2641272 (1953-06-01), Seale
patent: 3442515 (1969-05-01), Murauskas
patent: 4256315 (1981-03-01), Larson et al.
Gilbert Robert W.
Treloar Howard A.
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Mining Supplies (Minsup) Pty. Ltd.
Smith Robert I.
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