JPH0840091A - Resin pipe having retainer - Google Patents

Abstract

PURPOSE:To prevent relative rotation of a resin pipe and a retainer in the case of mounting and demounting a screwed type cap to be put on a feed oil pipe of a gasoline tank or the like by constituting so that an engaging part of the retainer enters by calking and engages with an engaging recessed part arranged on an outer peripheral surface of an opening end part of the resin pipe. CONSTITUTION:A retainer 2 is composed of an inner cylinder part 21 and an outer cylinder part 22 integrally continuously arranged in this inner cylinder part 21 through a folded part 20. Two slits 4 and 4 are formed at slight intervals in the circumferential direc direction in a large diameter rear end part of the outer cylinder part 22 of the retainer 2, and a part between both slits 4 and 4 is formed as an engaging part 5. On the other hand, a diametrically slightly expanded opening end part 11 is formed in a resin pipe 1, and an partially notched engaging recessed part 3 is formed so as to partition a groove 6 which is formed in the base part 12 and makes a round in the circumferential direction. The engaging part 5 of the retainer 2 is locked in the engaging recessed part 3 of the resin pipe 1, and relative rotation of both 1 and 2 is checked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening end of a resin-made oil supply pipe used for a gasoline tank or the like, and particularly when attaching or detaching a screw cap for closing the opening end.
To prevent the retainer screwed to this from rotating around the axis,
The present invention relates to a resin pipe in which the retainer is locked.

[0002]

2. Description of the Related Art FIG. 7 is an elevational view showing a state in which a metal retainer 150 is attached to a conventional resin pipe 100. This retainer 150 has an inner cylindrical portion (not shown).
And an outer tube portion 151 and a folded portion 152 that connects them, and covers the open end of the resin pipe 100. Outer peripheral surface 101 near the open end of this pipe 100
A groove 102 for caulking is formed around the circumference of, and the outer cylindrical portion 151 of the retainer 150 is caulked in the groove 102 to fasten both.

[0003]

However, over a long period of use, the fastening force may be weakened due to stress relaxation of the resin forming the pipe 100, and the retainer 150 may run idle. The present invention has been devised in view of the above problems, and an object thereof is to prevent the retainer 150 from idling.

[0004]

A resin pipe having a retainer according to the present invention comprises a resin pipe and a metal retainer attached to an opening end of the pipe, and the pipe has an opening. An inner cylindrical portion having at least one engaging concave portion on an outer peripheral surface of the end portion on a line that goes around the outer peripheral surface, the retainer contacting an inner peripheral surface of the opening end portion of the pipe, and the inner cylindrical portion. A folded portion integrally formed with the folded end portion to cover the opening end surface of the opening end portion; and a portion of the portion that is integrally formed with the folded end portion, contacts the outer peripheral surface of the opening end portion, and corresponds to the engaging recessed portion. And a retainer attached to the open end of the pipe, wherein the retainer is attached to the open end of the pipe. Ring shape that makes one round in the circumferential direction including the engaging portion of the section Or crimped, the engagement portion with locked to the engaging recess of the opening end, and the outer cylindrical portion and the opening end, characterized in that it is integrally connected.

In the resin pipe having the retainer of the present invention, the pipe has at least one engaging concave portion on the outer peripheral surface of the opening end portion on a line that goes around the outer peripheral surface. The engagement recess is a portion that is recessed in the axial direction from the outer circumferential circle including the engagement recess. It should be noted that a plurality of engaging recesses can be provided along the outer circumference circle, and can be provided over the entire circumference of the outer circumference circle. However, a portion protruding in the centrifugal direction from the engaging recess extending in the axial direction is required between the adjacent engaging recesses.

On the other hand, the engaging portion of the retainer, which is locked in the engaging recess of the resin pipe, is formed by two slits that define the engaging portion and extend in the axial direction. The number of engaging portions of the retainer may be one or two or more. It is preferable that the number of slits that divide the engaging portion be small because it also weakens the caulking force. The slit may be open at one end open to the end of the outer cylinder or may be closed at both ends.

[0007] When the resin pipe and the retainer are mounted in the assembly process so that the mounting portion in the circumferential direction is always mounted at a constant portion, the engaging recess of the resin pipe is set to 1
Alternatively, the retainer may have only one engaging portion. But,
When the mounting portions of the resin pipe and the retainer in the circumferential direction change relative to each other and change, it is preferable to provide the engaging concave portion over the entire outer circumference of the resin pipe. Then, several engaging portions of the retainer are provided at a pitch different from the pitch of the engaging recesses so that at least one engaging portion and one recess engage with each other under any relative rotation condition. preferable.

[0008]

In the resin pipe having the retainer according to the present invention, the engaging portion of the retainer is caulked into the engaging concave portion provided on the outer peripheral surface of the opening end of the resin pipe to engage with the engaging concave portion. Therefore, the resin pipe and the retainer cannot rotate relative to each other, and the retainer can be prevented from idling.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) A resin pipe 1 having a retainer 2 according to Embodiment 1 of the present invention is shown in FIGS. As shown in FIGS. 1 and 4, the retainer 2 includes an inner cylinder portion 21 (shown in FIG. 4),
The folded-back portion 20 formed integrally with the inner cylinder portion 21
And the outer cylindrical portion 2 formed integrally with the folded-back portion 20.
Consists of two. A ring-shaped groove is formed between the inner cylinder portion 21 and the outer cylinder portion 22, and the open end of the resin pipe 1 is inserted and fixed in this groove.

As shown in FIG. 1, the outer cylindrical portion 22 of the retainer 2 has a large diameter rear end having a large outer diameter connected to a small diameter tip 20 having a small outer diameter at the tip and a small diameter tip 20 at a step. Two slits 4 and 4 which are formed of a portion 22 and extend in the axial direction are provided at a small interval in the circumferential direction of the large-diameter rear end portion 22. The portion between the two slits 4 and 4 is the engaging portion 5 of the present invention.

Further, on the inner cylindrical portion 21, a projecting strip 7 forming a screw thread projects in the axial direction and extends spirally in the circumferential direction. On the other hand, the resin pipe 1 has an opening end 11 with a slightly enlarged diameter, as shown in an elevation view of FIG. 2 and a cross section of FIG. The outer peripheral surface of the open end portion 11 is composed of the tip portion 10 having a small diameter and the base portion 12 having an enlarged diameter, like the outer cylindrical portion 22 of the retainer. The tip portion 10 is formed with a sealing groove 13 for holding the O-ring 8 and making one round in the circumferential direction.
Further, the base portion 12 is also formed with a caulking groove 6 that makes one round in the circumferential direction. Then, a part of a portion of the caulking groove 6 that projects in one of the axial directions, which defines the caulking groove, is formed as an engaging concave portion 3 that is missing.

The open end 11 of the resin pipe 1 having the O-ring 8 is inserted into the ring-shaped groove of the retainer 2, and the retainer 2 covers the open end 11. Then, the inner tubular portion 21 of the retainer 2 abuts on the inner peripheral surface of the opening end portion 11, and the outer tubular portion 22.
Covers the outer peripheral surface of the opening end 11 and contacts the O-ring 8 to seal the outer peripheral surface of the open end 11 and the inner peripheral surface of the outer tubular portion of the retainer 2.

In this state, the outer cylinder portion 22 is crimped in the axial direction along the outer peripheral circle including the engaging portion 5. As a result, the caulked portion is reduced in diameter in a ring shape, and is fitted into the caulking groove 6 of the opening end portion 11 and fixed. Then, the engaging portion 5 is pushed down in the axial direction and locked in the engaging recess 3 of the opening end 11. This state is shown in FIGS. 3 and 4.

The resin pipe having the retainer of the first embodiment has the above-mentioned structure. In the resin pipe having this retainer, the outer cylindrical portion 22 of the retainer 2 is crimped in a ring shape and fitted into the crimping groove 6 of the resin pipe 1 to be fixed. Therefore, there is no inconvenience such as rattling between the retainer 2 and the resin pipe 1. Further, the engaging portion 5 of the retainer 2 is locked in the engaging concave portion 3 of the resin pipe 1. Therefore, when the retainer 2 and the resin pipe 1 try to rotate relative to each other, the circumferential side end of the engaging portion 5 of the retainer 2 contacts the circumferential wall that defines the engaging recess 3 of the resin pipe 1. Touch and prevent relative rotation. Therefore, the retainer 2 and the resin pipe 1 cannot rotate relative to each other. Therefore, retainer 2
When a screw-in type cap that closes the opening end is attached to or detached from the opening end, the retainer 2 does not idle around the resin pipe 1 even if a force that rotates the retainer 2 acts. (Embodiment 2) A resin pipe having a retainer according to Embodiment 2 of the present invention is shown in FIGS. The resin pipe 1 having the retainer 2 of the second embodiment differs from the resin pipe having the retainer of the first embodiment only in the engaging portion and the engaging recess, and the other portions are the same.

As shown in FIG. 5, the engaging portion 50 of this embodiment is formed between two slits 40, 40 which are closed at both ends. On the other hand, the engaging concave portion 30 is the caulking groove 6
Is formed in the shape of a square hole with parts on both sides in the axial direction missing. By covering the open end of the resin pipe 1 having the engaging concave portion 30 with the retainer 2 having the engaging portion 50 and caulking the outer cylindrical portion 22 of the retainer 2 along the outer peripheral surface including the engaging portion 50. The diameter of the portion is reduced and enters the caulking groove 6 of the resin pipe 1 to be locked. Meanwhile, the engaging portion 30
Is separated from other caulked portions by the slits 40 and 40, and the concave portion is widened in the axial direction by the engaging concave portion 30, so that the engaging portion is widely pushed down in the axial direction, and Get in. Therefore, when the retainer 2 and the resin pipe 1 try to rotate relatively,
The circumferential side end of the engaging portion 50 of the retainer 2 comes into contact with the circumferential wall that defines the engaging concave portion 30 of the resin pipe 1, and prevents relative rotation. Therefore, the retainer 2 and the resin pipe 1 cannot rotate relative to each other. Therefore, even when a force that rotates the retainer 2 acts when the screw-in cap that closes the open end is attached to or detached from the open end of the retainer 2, the retainer 2 does not idle around the resin pipe 1.

[0016]

As described in detail above, in the resin pipe having the retainer according to the present invention, the engaging portion of the retainer engages with the engaging recess provided on the outer peripheral surface of the opening end of the resin pipe. Since it does not rotate, the retainer can be prevented from idling even if the fastening force is loosened due to stress relaxation or the like in the resin pipe.

[Brief description of drawings]

FIG. 1 is an elevational view of a retainer according to a first embodiment of the present invention.

FIG. 2 is an elevation view of the resin pipe according to the first embodiment of the present invention.

FIG. 3 is an elevational view of a resin pipe having a retainer according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a fastening state of the retainer and the resin pipe according to the first embodiment of the present invention.

FIG. 5 is an elevational view of a retainer according to a second embodiment of the present invention.

FIG. 6 is an elevational view of a resin pipe according to a second embodiment of the present invention.

FIG. 7 is an elevation view of a conventional resin pipe having a retainer.

[Explanation of symbols]

1 Resin pipe 2 Retainer 3, 30
Engagement recess 4, 40 Slit 11 Open end 6 Caulking groove 5, 50 Engagement part

Claims (1)

[Claims] 1. A pipe made of resin and a retainer made of metal attached to the opening end of the pipe, wherein the pipe is provided on the outer peripheral surface of the opening end on a line that goes around the outer peripheral surface. The retainer has at least one engaging recess, and the retainer has an inner cylindrical portion that abuts an inner peripheral surface of the opening end portion of the pipe, and an opening end surface of the opening end portion that is integrally formed with the inner cylindrical portion. A circumferential direction in which a folded-back portion that covers the same and a slit that is formed integrally with the folded-back portion and that abuts the outer peripheral surface of the opening end portion and that extends in the axial direction on both sides of a portion corresponding to the engaging recess An outer tubular portion having a discontinuous engaging portion, and the retainer is attached to the open end portion of the pipe and makes a ring in a circumferential direction including the engaging portion of the outer tubular portion. And the engaging portion is the engaging recess of the open end. Together we are locked, a resin pipe having a retainer and the outer cylinder portion and the opening end portion is integrally coupled.