JPH0381037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing joint pipes such as gas pipes and water pipes from coming off, and more specifically, the present invention relates to a device for preventing joint pipes such as gas pipes and water pipes from coming off. a locking member having a protrusion that fits inside an annular holder connected to the socket tube, and a pressing tool that presses the locking member to press the locking member against the outer circumferential surface of the socket tube. a cam portion that presses the locking member toward the insertion tube as the locking member moves in the insertion tube extraction direction; This invention relates to a device for preventing the joint pipe from coming off.

In such a detachment prevention device, conventionally, when a pressing tool is provided, for example, as disclosed in Japanese Utility Model Application Publication No. 58-53984, a push bolt as a pressing tool is provided with an inclined surface as a cam portion on the locking member side. The locking member is pressed in an attitude perpendicular to the locking member, so that the locking member is prevented from moving in the insertion tube extraction direction even when pressed by the push bolt.

For jointed pipes, so that the jointed pipe can expand and contract due to temperature changes, etc. to a large extent,
It is desirable to have flexibility at the pipe joint, but
In the case of the above-mentioned conventional means, since the movement of the locking member is prevented by pressing the push bolt, there is a disadvantage that it cannot be used for a joint pipe that expands and contracts over a large range, and there is room for improvement.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to have a function of crimping a locking member with a pressing tool and a function of pressing the locking member with a cam part. However, it is an object of the present invention to provide a device for preventing the joint pipe from coming off, which can allow expansion and contraction of the joint pipe within a wide range, improves the workability of assembling the locking member, and enables efficient burying work of the joint pipe. It is in.

An object of the present invention to achieve the above object is to attach a locking member to the socket tube, the locking member having a protrusion on the inner peripheral surface side that bites into the outer peripheral surface of the socket tube to be inserted into the socket tube. A pressing tool is provided which is fitted inside the continuous annular holder and presses the locking member so as to press it against the outer peripheral surface of the insertion tube, and the pressing tool is provided to press the locking member to the outer peripheral surface of the insertion tube, and to press the locking member against the outer peripheral surface of the locking member and the inner surface of the holder. [ stomach〕~
The configuration described in [C] is provided.

[A] The locking member is formed in a C-shape separated at one point in the circumferential direction, and
Both ends of the divided portion are provided with pressed portions that receive the force exerted by the pressing tool.

[B] The pressing tool is configured to tighten the pressed portions of the locking member in a direction in which they approach each other in the circumferential direction, and the pressing tool and the locking member or the annular holder A flexible portion in the tube axis direction that allows the locking member to move in the insertion tube extraction direction is formed between the two.

[C] The annular holder and the locking member are configured such that the cam portion starts the pressing action after the locking member moves within a certain range in the insertion tube extraction direction with respect to the holder. A space for accommodating the locking member on the inner circumferential surface of the holder is formed with a flexible gap that allows the cam portion to be assembled in a non-contact manner.

The effects of taking the above technical measures are as follows.

In other words, while pressing the locking member with the pressing tool, the locking member is allowed to move in the insertion tube extraction direction, and the pressing action of the cam part causes the locking member to move against the holder. It is configured to start after moving within a certain range in the insertion tube extraction direction.

Therefore, by attaching the locking member so that it bites into the insertion tube with a pressing tool, and by the action of the cam part after contact, as the locking member moves in the insertion tube extraction direction, While preventing the movement of the locking member as specified, the pipe joint is flexible enough to allow expansion and contraction in the longitudinal direction of the pipe over a wide range. As a result, a device for preventing the joint pipe from coming off, which is extremely comfortable for joint pipes that expand and contract due to temperature changes, etc., has been obtained.

Moreover, since the biting action of the locking member by the C-shaped pressing tool is performed by operation in the circumferential direction of the pipe, the pressing tool can be operated in the circumferential direction of the pipe. The operation can be performed at only one location. Therefore, when a joint pipe is buried underground, it is only necessary to create a space in which the pressing tool can be operated at only one location above the pipe. Another advantage is that the labor required for excavation work to create spaces for manipulating the pipe at multiple locations in the circumferential direction of the tube can be saved.

Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, the inlet tube 1 is
One end of the socket tube 2 is provided so as to be insertable into the large diameter part, a rubber packing 3 is interposed at the junction of the two tubes 1 and 2, and a protrusion a that bites into the outer peripheral surface of the socket tube 1 is provided inside. A C-shaped locking member 4 is provided on the circumferential surface and is separated at one point in the circumferential direction, and the locking member 4 is crimped onto the outer circumferential surface of the insertion tube 1 so as to be deformable in diameter. A pair of left and right push bolts 5 are provided as pressing tools to press both ends of the locking member 4 toward each other, and the locking member 4 is moved in the insertion tube extraction direction. An annular holder 6 into which the locking member 4 is fitted is connected to the socket pipe 2 to prevent the joining pipe from coming off.

Next, each part will be explained in detail.

The end flange portion 2a of the socket pipe 2 and the holder 6
A plurality of T-shaped bolts 7 are provided that can be inserted freely over the outer circumference side protrusion 6a of the holder 6, and nuts 8 that can be attached to the bolts 7 are provided. The holding body 9 is connected to the socket pipe 2 by tightening the T-shaped bolt 7, and the rubber packing 3 is compressed accordingly to maintain water (air) tightness. The rubber gasket 3 is configured so that it can be pressed.

The pair of push bolts 5 are screwed into the outer periphery side bulging portion 6c of the holding body 6, and the tongue-shaped pressed portion 4a which is pressed by the pair of push bolts 5 is connected to the part of the locking member 4. A push bolt 5 is provided at each of the ends so as to press the locking member 4 in a state that allows the locking member 4 to move in the direction in which the insertion tube is removed.

That is, the pressing tool 5 is configured to tighten the pressed portions 4a, 4a of the locking member 4 in a direction in which they approach each other in the circumferential direction. Then, between this pressing tool 5 and the tongue-like pressed portion 4a of the locking member 4, the pressing bolt 5
The distal end surface of the tongue-shaped pressed portion 4a is in a state where it can move relative to the other in the axial direction, that is, the surface of the tongue-shaped pressed portion 4a is in a state along the axial direction, so that the locking member 4 forms a flexible portion in the tube axis direction that allows movement in the insertion tube extraction direction.

As shown in FIGS. 3 to 5 A and B, the outer circumferential surface of the locking member 4 and the inner circumferential surface of the holding body 6 are respectively damaged as the locking member 4 moves in the insertion tube extraction direction. a cam portion S that presses the locking member 4 toward the insertion tube;
The locking member is configured such that the locking member 4 moves within a certain range in the insertion tube extraction direction with respect to the holding member 6, and then the cam portions S and T start the pressing action. 4 and the holding body 6 are provided so as to be freely assembled in a state where the cam parts S and T are not in contact with each other. In other words, the annular holding body 6 and the locking member 4 are
After the locking member 4 moves within a certain range in the insertion tube extraction direction with respect to the holder 6, the cam portions S, T
in the interior space 6A of the locking member 4 on the inner circumferential surface side of the holder 6 so as to start the pressing action.
It is formed with a flexible gap that allows the cam parts S and T to be assembled in a non-contact manner. In this way, the pipe joint is made flexible so that the joint pipe can expand and contract to a large extent due to temperature changes, etc., and moreover, the movement of the insertion pipe 1 in the extraction direction side is made flexible. Accordingly, the locking member 4 is reliably bitten into the inlet tube 1 by the wedge action of the cam portions S and T, thereby reliably preventing the two tubes 1 and 2 from coming off.

To form the cam portions S and T, a plurality of cam protrusions as the locking member side cam portion S are provided at appropriate intervals in the circumferential direction, and a cam surface as the holder side cam portion T is formed on the bulging portion. It is formed over substantially the entire circumference in the circumferential direction except for 6c.

Next, another embodiment will be described.

As the pressing tool, in addition to providing the pair of pressing bolts 5 described above, various modifications can be made. For example, as shown in FIGS. 6 and 7, one bolt 9 can be screwed onto one of a pair of pressed parts 4a and can freely pass through the other pressed part 4a and bulging part 6c. is provided with a ring-shaped portion 9a that can freely come into contact with the other pressed portion 4a, and a bolt insertion hole 10 on the side of the bulged portion 6c.
may be formed in the shape of a long hole along the longitudinal direction of the pipe.

In addition, when forming the cam parts S and T, both S and T
In addition to making each of the contact portions in the shape of an inclined surface, the specific structure can be changed in various ways, such as making one of the contact portions in the shape of an inclined surface and the other in the shape of a protrusion.

[Brief explanation of drawings]

The drawings show an embodiment of the joint pipe detachment prevention device according to the present invention, and FIG. 1 is a longitudinal cross-sectional side view of the joint pipe, and FIG.
The figure is a view taken along the line - in Fig. 1, Fig. 3 is a front view of the locking member, Fig. 4 is a side view of the locking member, and Fig. 5 A and B are longitudinal sectional side views of the locking member mounting part. , 6th
7 are a cutaway front view and a cutaway side view of another embodiment. DESCRIPTION OF SYMBOLS 1... Insertion tube, 2... Socket tube, 4... Locking member, 4a... Pressed part, 5... Pressing tool, 6... Holder, 6A... Interior space, S, T ...cam section,
a...Protrusion.

Claims (1)

[Scope of Claims] 1. A locking member 4 having a protrusion a on the inner peripheral surface side that bites into the outer peripheral surface of the socket tube 1 inserted into the socket tube 2 is connected to the socket tube 2. A pressing tool 5 is provided, which is fitted into the annular holder 6 and presses the locking member 4 so as to press the locking member 4 against the outer peripheral surface of the insertion tube 1. Cam parts S and T are formed on the inner peripheral surface of the holding body 6, respectively, to press the locking member 4 toward the insertion tube as the locking member 4 moves in the insertion tube extraction direction. , Furthermore, a joint pipe detachment prevention device comprising the configurations described in [A] to [C] below. [B] The locking member 4 is formed in a C-shape separated at one point in the circumferential direction, and the pressing tool 5 is provided at both ends of the separated point.
The pressed portions 4 and 4a are provided with pressed portions 4 and 4a that receive an acting force. [B] The pressing tool 5 is configured to tighten the pressed parts 4a, 4a of the locking member 4 in a direction in which they approach each other in the circumferential direction, and the pressing tool 5 and the locking A flexible portion in the tube axis direction is formed between the member 4 or the annular holder 6 to allow the locking member 4 to move in the insertion tube extraction direction. [C] The annular holder 6 and the locking member 4 are arranged so that the cam portions S and T move after the locking member 4 moves within a certain range in the insertion tube extraction direction with respect to the holder 6. In order to start the pressing action, a flexible gap is provided in the interior space 6A of the locking member 4 on the inner peripheral surface side of the holder 6 to allow the cam parts S and T to be assembled in a non-contact state. It is formed.