Pipe joints or couplings – Packed – Gasket retainer
Patent
1997-02-26
1998-07-14
Arola, Dave W.
Pipe joints or couplings
Packed
Gasket retainer
285319, F16L 1700
Patent
active
057792860
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention and Related Art Statement
The present invention relates to a pipe or conduit joining construction in which a resin or polymeric pipe is fitted onto the outer periphery of a metallic male fitting portion or male end form to join the pipes. This pipe joining construction is suitable to pipes for transporting fluid, such as gasoline, oil, water, and air, from the fluid source side, such as a vessel or storage tank, to the fluid receiving side, such as motor vehicles and various machines and equipment.
One example of a conventional pipe joining construction is shown in FIG. 7. In this case, a male fitting portion 32 of a metallic connector 31, except for a tip end portion, has an outside diameter slightly larger than the inside diameter of a resin pipe P, and has a tapered portion 32a and a slip-out preventive ridge 32b at the tip end. The male fitting portion 32 is pressed into the end portion of the resin pipe P by which a seal is provided by using a tightening force of the resin pipe P which is elastically deformed by the pressing.
On the other end of the connector 31, a metallic pipe M is inserted. By this insertion, a locking claw 35 of a retainer R is engaged with a bead 34 formed at the outer periphery of the metallic pipe M. On the other hand, the edge of the female portion 33 of the connector 31 is folded back to the inside to provide a slip-out preventive piece 33a which engages a slip-out preventive piece receiving portion 36 on the retainer R. Thus, the resin pipe P and the metallic pipe M are joined to each other.
For the above-described pipe joining construction, airtightness is maintained only by the tightness of the resin pipe P. Therefore, when creep deformation of the resin pipe P occurs due to heat deterioration, the force for tightening the male fitting portion 32 decreases such that the airtightness cannot be maintained. Other factors which contribute to a lack of air tightness include variations in the size and tolerances of both pipes, the I.D. surface finish of the resin pipe, the O.D. surface finish of the metal pipe, the metal pipe weld seam, and the hardness of the resin pipe.
SUMMARY OF THE INVENTION
The present invention has been made to solve the above problems. Accordingly, it would be desirable to provide a pipe joining construction which maintains airtightness for a long period of time, easily ensures the dimensional accuracy and surface finish accuracy, improves cold temperature sealing, reduces permeation, improves sealing after exposure to heat, and can decrease costs.
To achieve this end, the present invention is characterized in that, in a pipe joining construction for connecting a resin or polymeric pipe to a metallic pipe by fitting the resin pipe onto the outer periphery of a metallic male fitting portion or end form, a seal member is mounted at the outer periphery of the male fitting portion of a connector and a collar covers the outer periphery of the tip end of the male fitting portion. The collar has a tapered portion with a tapered outer periphery. Further, the collar is used as a holding member for holding the seal member in place.
In another embodiment, the present invention is further characterized in that a ring is mounted at the outer periphery of the male fitting portion adjacent to the seal member at a position opposite to the collar. The present invention is also characterized in that a bead is formed at the male fitting portion, the ring is mounted adjacent to the seal member between the bead and the seal member, and the seal member is positioned and held between the collar and the ring.
The present invention, in which a seal member is mounted at the outer periphery of a metallic male fitting portion, the outer periphery of the tip end of the male fitting portion is covered by a collar, the collar has a tapered portion with a tapered outer periphery, and the collar is used as a holding member for the seal member, can maintain airtightness for a long period of time, and can easily ensure the required
REFERENCES:
patent: 2131509 (1938-09-01), Goepel et al.
patent: 3955834 (1976-05-01), Ahlrot
patent: 4603890 (1986-08-01), Nuppee
patent: 5135268 (1992-08-01), McNaughton et al.
patent: 5219188 (1993-06-01), Abe et al.
patent: 5261709 (1993-11-01), McNaughton et al.
Arola Dave W.
ITT Automotive Inc.
Lewis J. Gordon
Sanoh Industrial Co., Ltd.
Twomey Thomas N.
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