Pipe joints or couplings – Essential catch – Leaf spring
Patent
1991-07-16
1992-11-17
Arola, Dave W.
Pipe joints or couplings
Essential catch
Leaf spring
285921, F16L 3900
Patent
active
051637200
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a pipe joint for use in a hydraulic circuit etc.
2. Background Art
This kind of pipe joint is generally equipped with a pipe which has an outward facing flange in the vicinity of its tip portion, an annular joint body in one-side inner peripheral part of which the pipe tip end portion fits, and a tubular fixture which covers an outer peripheral part of the joint body and couples the pipe to the joint body.
An inward facing flange fronting on the outward facing flange is formed integrally on one end of the tubular fixture, and female threads are cut on an inner peripheral surface of the other end of the fixture. The female threads are screwed onto male threads cut on an outer peripheral surface of the joint body, so that the pipe is coupled to the joint body.
In this structure, however, such a method is employed that a coupling work is accomplished by screwing the female threads of the fixture onto the male threads, so that the structure requires a time and man power for its assembly process and is not suitable for mass production. Further, since the fixture should always be kept fitted onto the pipe, the structure is unfavorable from the standpoint of storage and transportation.
In order to solve the above problem, such a structure is also well known that has an outward facing flange formed in the vicinity of tip end portion of a first pipe, a coupling member joint immovably to a side surface opposite to a tip end of the outward facing flange, sealing member fitted to an outer periphery of the tip end portion of the pipe, a second pipe surrounding an outer periphery of the sealing member so as to compress it, a spacer extending integrally from the second pipe and covering an outer periphery of the first pipe with a radial clearance left between them, and a stopping hole formed on an outer periphery of end of the spacer; the coupling member being provided with a pressing projection which is so formed as to be deformed elastically in radial direction and rests in the stopping hole, and the pressing projection having a fitting groove in which an edge of the stopping hole fits so as to limit an elastic deformation of the pressing projection when the first pipe moves in a direction as leaving from the second pipe. (Japanese Unexamined Utility Model Publication No. 62181788)
In this structure, however, it is required to shift the above coupling member in the radial direction in order to have the pressing projection rest in the stopping hole. Therefore, a finger or a jig is ready to be caught between an end of the spacer and the clamping member during assembly work. Further, since the clamping member is composed of an elastic rubber, it should be made thick in order to let it have a sufficient mechanical strength. Therefore, its weight will increase unpreferably. An object of the invention is to solve the above-mentioned problem.
DISCLOSURE OF THE INVENTION
In order to solve the above-mentioned problem, this invention provides a pipe joint having a pipe which includes an outward facing flange in the vicinity of its tip end portion, a joint body for coupling the pipe, and a tubular metal fixture which has a diameter of inner peripheral part larger than that of the above outward facing flange, the above joint body concentrically including an annular large opening port into which the tubular fixture fits from the end side and a small opening port which is connected to the large opening port and in which the pipe tip end portion fits; characterized by that the tubular fixture has a stopping part which extends from its end toward radial outside to rest against a tip end face of the joint body, a springy first claw which is cut and raised from a peripheral wall to an outer peripheral side in an axial direction so that the claw gets away from an axis line as it comes to a side opposite to the small opening port of the joint body, and a springy second claw which is cut and raised from the peripheral wall to an inner peripheral side in the axial direction so tha
REFERENCES:
patent: 4135745 (1979-01-01), Dehar
patent: 4637640 (1987-01-01), Fournier et al.
patent: 4781400 (1988-11-01), Cunningham
patent: 4948176 (1990-08-01), Bartholomew
patent: 4948180 (1990-08-01), Usui et al.
Arola Dave W.
Kabushiki Kaisha Daikin Seisakusho
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