JPH1113956A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint furnishing a collet which has an excellent removal preventive property when a removal force in the oblique direction is operated to an insertion pipe. SOLUTION: This pipe joint consists of a pipe joint main body 1 furnishing a socket 11; and a collet 2 in which a head 21 furnishing a thrust to the outer peripheral surface of an insertion pipe is provided at one end, a flange 22 projecting on the outer peripheral surface is provided at the other end, and its one end side is inserted in the socket 11, while its other end side is provided other than the socket 11. And an inclined surface 111a made the smaller diameter gradually as going to the opening side is provided on the inner peripheral surface of the socket 11, and an inclined surface 211 made the smaller diameter gradually as going to the opening side of the socket 11 is provided opposing to the inclined surface 111a of the socket 11, on the outer peripheral surface of the head 21 of the collet 2, and at least one side of the inclined surface 111a of the socket 11 and the inclined surface 211 of the collet 2 is made in an inclined surface bending in a projecting form along the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint provided with a collet.

[0002]

2. Description of the Related Art Conventionally, a pipe joint in which a pipe is easily attached and detached is described in JP-A-53-114520.
As shown in the figure, a main body member d provided with a receiving port b having a tapered taper a on the inner peripheral surface, and an O-ring sealing portion c is mounted on the inner side of the receiving port b, and inserted into the receiving port b. At one end,
There is known a pipe joint including a collet i having a taper e opposed to the taper a of the receiving port b and an arm g having an edge f, and a flange h at the other end.

In order to connect the pipe p to the receiving port b, the pipe joint is simply pushed into the collet i so that the pipe to be connected is inserted into the collet i. And between the inner peripheral surface of the receiving port b and the pipe p
The tapping force of the arm g of the collet i comes into contact with the taper a of the receiving port b.
Bites into the outer peripheral surface of the pipe p, thereby preventing the pipe p from coming out. When the pipe p is removed from the inside of the socket b, the flange h of the collet i is simply pushed into the deep side of the socket b, so that the edge f bites. Can be easily removed so that the attachment / detachment can be performed quickly.

However, when the pipe p is connected to the conventional pipe joint as described above, the taper e of the arm g of the collet i is changed to the taper e of the socket b when an oblique pull-out force acts on the pipe p. a), the stress applied to the arm g of the collet i becomes uneven in the circumferential direction, and the bite of the edge f into the pipe p becomes uneven. There is a point.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and is a pipe joint provided with a collet which is excellent in retaining property when an oblique-direction exit force acts on an insertion tube. The purpose of this is to provide.

[0006]

According to the present invention, there is provided a head having at least one end provided with a socket having a rubber packing attached thereto, and a head provided with a bite portion at one end to an outer peripheral surface of an insertion tube. A pipe joint comprising a collet provided with a flange, a flange protruding on the outer peripheral surface at the other end, one end inserted into the receptacle, and the other end disposed outside the receptacle. The inner peripheral surface of the receptacle is provided with an inclined surface having a diameter gradually decreasing toward the opening side, and the outer peripheral surface of the head portion of the collet is opposed to the inclined surface of the receptacle toward the opening side of the receptacle. As a result, at least one of the inclined surface of the receptacle and the inclined surface of the collet is formed as an inclined surface that is convexly curved along the axial direction.

[0007]

The pipe joint of the present invention is provided with an inclined surface having a diameter gradually decreasing toward the opening side on the inner peripheral surface of the socket,
On the outer peripheral surface of the head portion of the collet, an inclined surface having a diameter gradually decreasing toward the opening side of the receiving port is provided, facing the inclined surface of the receiving port, and the inclined surface of the receiving port and the inclination of the collet are provided. Since at least one of the surfaces is formed as an inclined surface curved convexly along the axial direction, at least one of the surfaces is formed even when an insertion force is applied to the insertion tube in an oblique direction with respect to the axial direction of the socket. Since the inclined surface of the collet head and the inclined surface of the receiving port, which are made to be convexly curved along the direction, come into contact with almost uniform stress, the diameter of the head part is reduced uniformly. As a result, the bite portion uniformly bites into the outer peripheral surface of the insertion tube, so that the insertion tube is prevented from coming out of the receptacle.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the pipe joint of the present invention. This pipe joint comprises a pipe joint body 1 and a collet 2.

The pipe joint body 1 has a receiving port 11 at one end. The receiving port 11 is provided with a concave groove 111 on the inner peripheral surface along the circumferential direction, a rubber packing 12 is mounted on the inner side of the concave groove 111, and the inner peripheral surface at the open end of the concave groove 111 is The inclined surface 111a gradually becomes smaller in diameter toward the opening end, and curves convexly along the axial direction. A stopper 112 is provided at the innermost part of the receiving port 11 so that the tip end surface of the pipe to be connected abuts.

The collet 2 has a receiving port 1 on one end and an outer peripheral surface.
The head unit 21 includes an inclined surface 211 having a diameter that is uniformly reduced toward the opening side of the receiving port 11 and faces the insertion surface of the insertion tube 212 on the inner peripheral surface.
Is provided at the other end, and is formed of a cylindrical body provided with a flange 22 protruding along the circumferential direction on the outer peripheral surface.

At one end of the collet 2 where the head portion 21 is provided, cuts 23 are provided at a plurality of positions along the axial direction, and the head portion 21 is divided into a plurality of portions. The diameter is reduced by pressing inward in the radial direction, and after being inserted into the receiving port 11 in this state, the diameter can be increased outward in the radial direction.

The collet 2 is arranged such that one end of the collet 2 provided with the head portion 21 is inserted into the receiving port 11 and the other end of the collet 2 provided with the flange portion 22 is provided outside the receiving port 11. Used for

Next, the usage of the pipe joint shown in FIG. 1 will be described with reference to FIG.
It will be described with reference to FIG. As shown in FIG. 2, the insertion tube 3 to be connected is inserted into the collet 2 so as to pass therethrough. Thereby, the rubber ring 12 seals between the outer peripheral surface of the insertion tube 3 and the inner peripheral surface of the concave groove 111 of the receptacle 11.

When a force is applied to the insertion tube 3 obliquely with respect to the axial direction of the receiving port 11, the collet 1
When the inclined surface 211 of the second head portion 21 comes into contact with the inclined surface 111a which is convexly curved along the axial direction of the receiving port 11, the diameter of the head portion 111 is reduced uniformly, and the bite portion 212 is formed. It penetrates the outer peripheral surface of the insertion tube 3 uniformly. As a result, the insertion tube 3 is prevented from falling out of the receptacle 11.

FIG. 3 is a sectional view showing another example of the pipe joint of the present invention. In this example, the groove 111 of the receptacle 11
The inner peripheral surface of the open end is an inclined surface 111a 'having a uniform diameter toward the open end. In addition, on the outer peripheral surface of the head portion 21 of the collet 2, the inclined surface 11 of the socket 11 is provided.
Opposite to 1a, there is provided an inclined surface 211 'whose diameter gradually becomes smaller toward the opening side of the receiving port 11 and which curves in a convex shape along the axial direction. For other structures,
Since they are the same as those described with reference to FIG. 1, only the corresponding drawing numbers are given in the figure, and detailed description is omitted.

FIG. 4 is a sectional view showing still another example of the pipe joint of the present invention. In this example, on the outer peripheral surface of the head portion 21 of the collet 2, the diameter becomes gradually smaller toward the opening side of the receiving port 11 and gradually increases toward the opening side of the receiving port 11 in a convex shape along the axial direction. Curved inclined surface 21
1 '. The other structure is the same as that described with reference to FIG. 1, and therefore only the corresponding drawing number is given in the figure and the detailed description is omitted.

[0017]

As described above, the pipe joint of the present invention is excellent in retaining property when the insertion pipe is subjected to an oblique pull-out force.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an example of a pipe joint of the present invention.

FIG. 2 is a partial cross-sectional view illustrating a use state of the pipe joint shown in FIG.

FIG. 3 is a partial sectional view showing another example of the pipe joint of the present invention.

FIG. 4 is a partial sectional view showing still another example of the pipe joint of the present invention.

FIG. 5 is a cross-sectional view illustrating an example of a conventional pipe joint provided with a collet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Collet 11 Receptacle 12 Rubber packing 21 Head part 22 Flange part 23 Notch 111 Concave groove 211, 111a Inclined surface 212 Biting part

Claims (1)

[Claims] At least one end is provided with a pipe joint body provided with a receiving port to which a rubber packing is attached, and at one end, a head portion having a bite portion into an outer peripheral surface of an insertion tube is provided,
A flange is provided at the other end, the flange being protruded on the outer peripheral surface, one end is inserted into the receiving port, and the other end is a collet arranged outside the receiving port. The inner peripheral surface is provided with an inclined surface having a gradually decreasing diameter toward the opening side, and the outer peripheral surface of the head portion of the collet has a gradually decreasing diameter toward the opening side of the receiving port, facing the inclined surface of the receiving port. A pipe joint, wherein an inclined surface is provided, and at least one of the inclined surface of the socket and the inclined surface of the collet is an inclined surface that is convexly curved along the axial direction.