JPS646469Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a pipe joint.

For example, as shown in Japanese Utility Model Application Publication No. 52-31921, a plurality of inclined claw pieces 2, 2, . . . as shown in FIGS. A pipe joint is known in which a claw 1 made of a metal plate is provided in a manner that prevents the pipe from coming off, and a tube having a diameter slightly larger than the inner diameter of the claw 1 can be inserted and connected thereto. In this pipe joint, as shown in Fig. 1B, the tube is inserted from above into the claw 1, and the inner edge of each claw piece 2 is bitten to the outer periphery of the tube by elastic restoring force, thereby preventing the tube from slipping out from the joint body. However, in such pipe joints, determining the strength of the claws is a very important issue. That is, when the claw is integrally constructed from a metal plate as described above, the strength required for holding the tube of the claw piece itself and the slope of each claw piece when inserting the tube into the claw are required. Since the elasticity required to greatly expand the inner diameter depends on the thickness or strength of the metal plate, it is extremely difficult to set both to appropriate values. In this case, although it becomes easier to insert the tube, the strength of the claw piece itself decreases, making it impossible to securely hold the tube, and if a strong metal plate is used, the tube cannot be held firmly. Although it can be held, the elastic force when pushing the claws apart becomes strong, making it difficult to insert the tube.Furthermore, if the tube is inserted forcibly, the claws remain bent and do not return to their original shape, making it impossible to hold the tube at all. There is also.

In view of the above, the present invention provides a pipe joint that has claws that have appropriate strength to hold the tube and that allow the claw pieces to be pushed and expanded against an appropriate elastic force when the tube is inserted. This is what we are trying to provide.

In order to achieve the above object, the pipe joint of the present invention is constructed by integrating a plurality of fan-shaped claw pieces into an annular shape by connecting the claws in the joint body in an annular manner by means of a connecting body made of an elastic material.

When a tube is inserted into a pipe joint with such a configuration, each claw is pushed out by the tube against the elastic restoring force of the connecting body, expanding its inner diameter and allowing the tube to enter the joint body. In this state, the inner edge of each claw piece bites into the outer periphery of the tube due to the elastic restoring force, thereby holding the tube in a non-removal state. In this case, the claw pieces are pushed apart against the elastic restoring force of the connecting body, and the tube is held by the strength of the claw pieces themselves, so if a single metal plate is used. This means that the strength etc. can be set independently without having any relationship with each other.

As described above, according to the pipe joint of the present invention, the claws that bite into the outer diameter of the tube are constructed by integrally connecting a plurality of fan-shaped claw pieces in an annular shape with a connecting body made of an elastic material. Therefore, the tube can be easily inserted by providing the claw pieces and the connecting body with the necessary strength and elasticity, respectively, and
The claw piece can be reliably bitten in the inserted state.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the pipe joint shown in FIG. 2, reference numeral 11 denotes a substantially cylindrical joint main body, into which a seal 12, a pawl 13, a guide 14, and a release bush 15 are inserted and arranged.

The joint body 11 is constructed by sequentially expanding the diameter of the fluid flow path 16 bored inside toward the tube insertion port side.
8 and a claw insertion hole 19 are formed. The seal 12 inserted into the seal insertion hole 18 is made of an elastic material and has a substantially O-ring shape, and the claw 13 inserted into the inner part of the claw insertion hole 19
As shown in Figures 5 and 6, the fan-shaped 4
The claw pieces 20, 20, . . . are connected and integrated by a connecting body 21 made of an elastic material such as rubber or soft synthetic resin.
It has approximately the same diameter as the tube 22, and its inner diameter is slightly smaller than the outer diameter of the tube 22 to which it is connected.
In addition, in order to connect and integrate the plurality of claw pieces 20, the claw pieces can be connected at the same time as the connecting body 21 is formed by molding, and the connecting body 21 does not have to be annular but can be divided into a plurality of pieces. It can also be configured as Furthermore, the guide 14 fitted and fixed to the tube insertion port side of the claw 13 is
It prevents the claw 13 from being pulled out of the claw insertion hole 19 and allows the release bush 15 to be slidably inserted, with a tip protruding to the extent that it comes into contact with the vicinity of the outer periphery of the claw piece 20. It has leg portions 24, a protrusion 25 on its outer periphery that engages with a recess in the inner wall of the pawl insertion hole 19, and a stepped portion 26 for preventing the release button from coming off on its inner periphery. Also,
The release button 15 has a flange portion 28 and a sleeve portion 29 integrally made of an elastic material, and has a plurality of elastic pieces 31, 3 formed by slits 30, 30, . . . at the tip of the sleeve portion 29.
1,..., and each elastic piece 3 thereof.
A tapered surface 32 is formed on the outside of the tip of each elastic piece 31 so that the tip of each elastic piece 31 comes into contact with the vicinity of the inner circumference of the claw piece 20, and a stopper is formed on the outside of the base end of each elastic piece 31. A stepped portion 33 is formed. The release button 15 moves from the position shown in FIG. 2, where the stepped portion 33 and the stepped portion 26 of the guide 14 engage, to the position shown in FIG. 4, where the flange portion 28 abuts the end surface of the joint body 11. It is designed to be able to slide up to the position. Note that in order to insert the release button 15 into the guide 14, the tapered surface 32 of the elastic piece 31 is
2 into the guide 14, the elastic piece 31 once reduces its diameter and is inserted into the guide 14, and then returns to the state shown in FIG. 2.

To connect the tube 22 to the pipe joint configured as described above, connect the tube 22 to the hole 3 of the release button 15.
4 to the tube insertion hole 17.
In this case, as the tube 22 enters, each claw piece 20, which is in a flat state as shown in FIG. 2, deforms into a dish shape as shown in FIG. Allow the tube 22 to reach the tube insertion hole 17. In this state,
Since each claw piece 20 tries to restore to its original planar state by the elastic restoring force of the connecting body 21, their inner edges bite into the outer periphery of the tube 22, and the tube 22
removal is prevented. Therefore, when a pulling force due to internal pressure or external force is applied to the tube 22,
Since each claw piece 20 of the claw 13 approaches a flat state, the amount of biting of their inner edges into the tube 22 increases, and the tube 22 is more firmly prevented from coming off.

To pull out the tube 22, push in the release button 15 as shown in FIG.
The tube 22 can be easily pulled out by simply releasing the biting.

In addition, the number of claw pieces 20 constituting the claw 13 is as follows:
The number is not limited to four, and the number can be increased or decreased as necessary.

[Brief explanation of the drawing]

Figures 1A and B are a plan view and a sectional view of a conventional claw, Figure 2 is a sectional view of an embodiment of the present invention, and Figures 3 and 4 are sectional views of the tube connected state and disconnected state. , 5 and 6 are a plan view and a sectional view of the claw piece and the claw. 11...Joint body, 12...Seal, 13...
Claw, 15...Release button, 16...Fluid channel, 20...Claw piece, 21...Connection body, 22...Tube.

Claims (1)

[Scope of utility model registration request] In the fluid flow path of the joint body, there is an O-ring-shaped seal that seals the tube to be connected, and when the tube is inserted into the center hole, the inner diameter expands from a flat state and transforms into a dish shape, allowing insertion of the tube. An annular pawl and a release button for releasing the inner edge of the pawl from biting into the tube are respectively provided, and the pawl is formed into an annular shape by connecting a plurality of fan-shaped pawl pieces with an elastic material. A pipe joint characterized by being constructed by connecting and integrating.