MXPA97001166A

MXPA97001166A - Construction of tube gasket

Info

Publication number: MXPA97001166A
Application number: MXPA/A/1997/001166A
Authority: MX
Inventors: Kaishio Mitsuo
Original assignee: Sanou Kogyo Kk
Priority date: 1994-08-31
Filing date: 1997-02-14
Publication date: 1998-10-30

Abstract

The present invention relates to a pipe joint construction for joining pipes, by fitting a polymer pipe in the outer periphery of a metal male end shape having a tip end, comprising: a seal member mounted on the outer periphery of the male end form, and a separate collar formed of a synthetic resin and mounted on the outer periphery of a tip end of the male end shape, the collar having a tapered portion with an outer periphery of taper, the collar acting as a retention member for the member of sel

Description

"CONSTRUCTION OF PIPE JOINT" BACKGROUND OF THE INVENTION FIELD OF THE INVENTION AND DECLARATION OF THE TECHNIQUE RELATED The present invention relates to a pipe or conduit joint construction in which a resin or polymer pipe is fitted on the outer periphery of a metal portion of the male mounting fitting or the male end shape for joining the pipes. This pipe joint construction is suitable for pipes for transporting fluid, such as gasoline, oil, water or air, from the side of the fluid source, such as a storage container or tank, to the receiving side of the fluid, such as motor vehicles and various machines and equipment. An example of a conventional pipe joint construction is shown in Figure 7. In this case, a male fitting portion 32 of a metal connector 31, except as regards the tip end portion, has an outer diameter slightly larger than the inner diameter of a resin pipe P, and has a tapered portion 32a and a release preventive flange 32b at the tip end. The portion 32 of the male fitting is pressed towards the end portion of the resin pipe P whereby a seal is provided, using a clamping force of the resin pipe P which elastically deforms by pressure. At the other end of the connector 31, a metallic M pipe is inserted. Through this insertion, an interlocking hook 35 of a retainer R engages an edge 34 formed on the outer periphery of the metallic pipe M. On the other hand, the edge of the female portion 33 of the connector 31 is bent back inwardly to provide a preventative part 33a to detach which engages a receiving portion 36 of the preventative piece to detach in the retainer R. In this manner, the resin pipe P and the metal pipe M are joined to one another. For the above-described pipe joint construction, air tightness is maintained only by the tightness of the resin pipe P. Therefore, when a progressive deformation of the resin pipe P occurs due to heat deterioration, the force to tighten the portion 32 of the male fitting decreases such that the tightness can not be maintained. Other factors that contribute to a lack of air tightness include variations in the size and tolerances of both pipes, the internal diameter surface finish of the resin pipe, the external diameter surface finish of the metal pipe, the welding seam of the metal pipe and the hardness of the resin pipe.

COMPENDIUM OF THE INVENTION The present invention has been produced to solve the aforementioned problems. Accordingly, it would be desirable to provide a pipe joint construction that maintains air tightness over an extended period of time, which readily assures dimensional accuracy and surface finish accuracy, which improves cold temperature sealing, which reduces the Permeation that improves sealing after exposure to heat and can reduce costs. To achieve this end, the present invention is characterized in that in a pipe joint construction for connecting a polymeric resin pipe with a metal pipe by fitting the resin pipe on the outer periphery of a metal portion of the male fitting fitting or end form, a seal member is mounted on 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. In addition, the collar is used as a retaining member to retain the seal member in place. In another modality, the present invention is further characterized in that a ring is mounted on the outer periphery of the portion of the male fitting accessory adjacent the seal member, in a position opposite the collar. The present invention is also characterized in that an edge is formed in the portion of the male mounting fitting, the ring is mounted adjacent the seal member between the edge and the seal member, and the seal member is placed and is retained between the seal member and the seal member. collar and the ring. The present invention, in which the seal member is mounted on the outer periphery of a metal portion of the male fitting, 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 periphery, and the collar is used as a retaining member for the seal member that can maintain air tightness for a prolonged period of time, and can easily ensure the required dimensional accuracy and accuracy of surface finish. The present invention offers the following effects. In the invention, the seal member is mounted on the outer periphery of the metal portion of the male fitting, the outer periphery of the tip end of the male fitting portion is covered by the collar, the collar has the portion tapered as a tapered outer periphery and the collar is used as a retaining member to retain the seal member. Therefore, the tapered portion can be used instead of the tip end shape of the conventional metal tube. Also, since the collar is used as a retaining member to retain the seal member, the air tightness can be maintained for a prolonged period of time, and the required dimensional accuracy and surface finish accuracy can easily be assured to Despite the variations in size, surface finish and hardness of one or both pipes. In another embodiment of this invention, the ring is mounted on the outer periphery of the portion of the male fitting accessory adjacent the seal member, in a position opposite the collar. Therefore, the working accuracy of the male fitting portion has no effect on the sealing properties. In another embodiment of the invention, the rim is formed in the portion of the male mounting fixture, the rim is mounted adjacent the seal member between the rim and the seal member, and the seal member is positioned and retained between the rim and the seal member. collar and the ring. Therefore, the working accuracy of the portion of the male fitting accessory including the edge has no effect on the sealing properties.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side elevation view partially in cross section showing a pipe joint construction in accordance with a first embodiment of the present invention; Figure 2 is a side elevation view, partly in cross section showing a modification of the first embodiment of the present invention; Figure 3 is a side elevational view partially in cross section showing another modification of the first embodiment of the present invention; Figure 4 is a side elevation view partially in cross section showing a pipe joint construction in accordance with a second embodiment of the present invention; Figure 5 is a side elevational view partly in cross section showing a modification of the second embodiment of the present invention; Figure 6 is a side elevational view partially in cross section showing another modification of the second embodiment of the present invention; and Figure 7 is a side elevation view partially in cross section showing a conventional pipe joint construction.

DESCRIPTION OF THE PREFERRED MODALITIES The embodiments of the present invention will be described in detail with reference to the drawings. In Figure 1, a metallic pipe M, a pipe P of resin or polymer and a retainer R are the same as the corresponding elements shown in Figure 7. Therefore, the same reference numbers are applied to the same elements, and the detailed explanation of these elements is omitted. In the construction of a pipe or conduit joint according to a first embodiment, a seal member S is mounted on the outer periphery of a portion of the male fitting or the end form 2 of a metal connector 1 and a collar 5 is provided to cover the outer periphery of the tip end of the portion 2 of the male fitting. In this pipe joint construction, the collar 5 is interposed between the outer periphery of the portion 2 of the male fitting and the inner periphery of the resin pipe P so that the collar 5 is used as a retaining member for retaining the seal member S. The connector 1 integrally has the portion 2 of the male mounting fitting made on a spool and a female portion 3 having a larger diameter than that of the portion 2 of the male fitting. A detachable preventive flange 2a and an edge 2b are formed in portion 2 of the male fitting. The annular seal member S is mounted on the outer periphery adjacent the edge 2b and the collide 5 is mounted on the tip end side adjacent the seal member S, to cover the outer periphery of the portion 2 of the male fitting fitting . The connector 1 does not have a tapered portion in the portion 2 of the male fitting. The connector 1 is provided with two O-rings 7, 7 positioned along the internal periphery of the female portion 3, a spacer 8 interposed between the o-rings 7, 7, an upper cap 9 adjacent the O-ring 7 and a retainer R. The edge of the female portion 3 bends back inward to form a preemptive part 3a of detachment. The seal member S, the O-ring being made of NBR (nitrile-butadiene rubber), synthetic fluorine or silicon rubber, or the like, is mounted near the edge 2b of the collar 5 and the edge 2b. The collar 5 made of synthetic resin such as polyamide, polypropylene and polyethylene, has an integral tapered portion 5a and a ring portion 5b. The ring portion 5b fits on the outer periphery of the tip end of the portion 2 of the male fitting and a portion of the tapered portion 5a protrudes from the tip end of the portion 2 of the male fitting. The outer periphery of the portion 5a is formed in such a way as to be essentially the same as the tapered portion 32a of the portion 32 of the conventional male mounting accessory shown in Figure 7. The collar 5 not only covers the outer periphery of the tip end of portion 2 of the male fitting; but a retention member is also used to retain the seal member S in place. An internal shoulder in the collar 5 abuts against the tip end of the portion 2 of the male fitting, as shown in Figures 1 and 2. To join the pipes, the portion 2 of the male fitting member having the member Seal S and the collar 5 at the outer periphery of the tip end thereof is inserted into one end of a resin pipe 9, and the tip end of a metal M pipe is inserted into the female portion 3 of the connector 1. During the insertion of the metallic pipe M, an interlocking hook 35 of the retainer R is pressed and expanded within the elastic deformation scale, until an edge 34 in the metallic pipe M reaches a position beyond the tip end of the hook 35 of interlocking. Then, the interlocking hook 35 engages the edge 34 and a receiving portion 36 of the release preventive piece abuts against the release preventive piece 33a to prevent detachment of the metal pipe M from the resin pipe P. In this way, the resin pipe P and the metal pipe M are joined to one another through the connector 1.

In Figure 2, the same reference numerals are applied to the same elements shown in Figure 1. In this modification, a ring 11 is placed adjacent the seal member S between the edge 2b and the seal member S. In this case, since the seal member S is placed and is retained between the collar 5 and the ring 11, the working accuracy of the portion 2 of the male fitting including the edge 2b has no effect on the sealing properties of the pipe joint. In addition, as shown in another modification in Figure 3, a tapered portion 2c on the tip end of the portion 2 of the male fitting can be covered by a cylindrical seal member 13 and a tapered collar 15 can be adjusted on the periphery of the cylindrical seal member 13. The seal member 13 may be a cylindrical member, or it may be a member formed integrally by a portion 13a corresponding to an O-ring, a tapered portion 13b and a tip end portion 13c protruding beyond the tapered portion 12. of the portion 2 of the male fitting metal. Figures 4 to 6 are side elevational views partially in cross section showing the pipe joint constructions in accordance with a second embodiment of the present invention. In these pipe joint constructions, connector 1 is omitted. A portion of the male mounting fitting or end form 22 is formed at the tip end of the metallic pipe M, and the resin pipe P is fitted directly on the outer periphery of the portion 22 of the male fitting attachment to join the P pipe of resin or polymer in the metallic M pipe. The portion 22 of the male mounting fixture has a detachable preventative rim 22a and an edge 22b. The portion 22 of the male mounting fixture shown in Figure 6 is formed with a tapered portion 22c. Figures 4, 5 and 6 correspond to Figures 1, 2 and 3, respectively. Therefore, the same reference numbers are applied to the same elements and the explanation of the elements is omitted. According to the second embodiment, since the work is easy, long pipes subjected to surface treatment can be attached, for example automotive fuel lines and the sealing properties can be maintained for a prolonged period of time. The present invention is not limited to the aforementioned embodiments, and can be modified in various ways without deviating from the spirit and scope of the invention. For example, a metal can be used instead of synthetic resin to form the collar, or the preventive release flange can be omitted in the case of low pressure.

Claims

CLAIMS;

1. A pipe joint construction for joining pipes by fitting a polymer pipe to the outer periphery of a metal male end shape comprising: a seal member mounted on the outer periphery of the male end shape; and a collar covering the outer periphery of a tip end of the male end form, the collar having a tapered portion with a tapered outer periphery, the collar acting as a retaining member for the seal member.

The pipe joint construction according to claim 1, wherein a ring is mounted on the outer periphery of the male end shape adjacent to the seal member, in a position opposite the collar.

3. The pipe joint construction according to claim 2, wherein: an edge is formed in the male end shape; the ring is mounted adjacent to the seal member between the edge and the seal member; and the seal member is placed and is retained in the collar and the ring.

4. The pipe joint construction according to claim 1, wherein: an edge is formed in the male end shape; and the seal member is positioned adjacent to the edge.

The pipe joint construction according to claim 1, wherein: the collar has an internal shoulder that abuts against the tip end of the male end form.

The pipe joint construction according to claim 1, wherein: the male end shape has a tip end formed with a tapered end portion; the seal member is mounted above the tapered end portion of the male end form; and the collar covers an outer periphery of the tapered end portion of the seal member.

The pipe joint construction according to claim 6, wherein: the seal member has an end in the form of an O-ring, an intermediate tapered portion and a tip end portion.

The pipe joint construction according to claim 7, wherein: the tip end portion of the seal member protrudes beyond the tapered end portion of the male end shape.

9. The pipe joint construction according to claim 6, wherein: an edge is formed in the male end shape; a ring is mounted adjacent the seal member between the edge and the seal member; and the seal member is placed and is retained between the collar and the ring.

The pipe joint construction according to claim 6, wherein: an edge is formed in the male end shape; and the seal member is positioned adjacent to the edge.

The pipe joint construction according to claim 1, wherein: the portion of the male fitting is formed in an insertable pipe in the polymer pipe.

The pipe joint construction according to claim 1, further comprising: a connector having a male end shape formed at the tip end, and an opposite female portion, the male end form being insertable into the polymer tubing and the female portion receives another tubing.

13. The pipe joint construction according to claim 12, wherein: an edge is formed in the male end shape of the connector; a ring is mounted in the male end shape adjacent to the seal member, between the edge and the seal member; and the seal member is placed and is retained between the collar and the ring. The pipe joint construction according to claim 12, wherein: an edge is formed in the male end shape; and the seal member is positioned adjacent to the edge.