JPH041434Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention is a structure for preventing the removal of pipes such as water pipes and gas pipes that are plug-connected. and a connecting tube configured such that a push ring connected to the socket tube is fitted onto the outside, and a retaining tool can be pressed against the insertion tube by a pressing tool provided on the push ring between the push ring and the insertion tube. Regarding the retaining structure.

[Conventional technology]

Conventionally, in this type of connection pipe retaining structure, housing portions for wedge-shaped bridge members equipped with projections for biting into the insertion tube are formed on the inner circumferential side of the push ring at multiple locations in the circumferential direction. By pressing it toward the outer periphery, the bridge member was constructed so that it could be used as a stopper (for example, Japanese Patent Application Laid-Open No. 1985-1999).
Publication No. 15732, Japanese Unexamined Utility Model Publication No. 174920, Japanese Patent Publication No. 15732, Japanese Unexamined Patent Publication No.
(See Publication No. 57-15180).

[The problem that the idea aims to solve]

The conventional structure described above is useful in that even when an external force in the withdrawal direction is applied to the insertion tube, the biting protrusion of the bridge member exerts a strong retaining action due to the biting action. However, on the other hand, there are cases where the insertion tube is thin,
When a mortar lining is provided on the inner surface of the insertion tube, there is a risk that the insertion tube may be deformed due to the bite of the retaining protrusion, and the mortar lining may crack or fall off due to the deformation.

If the purpose is simply to prevent deformation of the insertion tube, for example, the retainer may be formed into a ring shape.
It is possible to disperse the pressing force of the pressing tool over a wide range in the circumferential direction of the pipe, but in this case, it is necessary to increase the wall thickness of the pushing ring to absorb the strong pulling force acting on the retaining tool. has become larger and heavier, and it has become difficult to transport it to the connection site and fit it onto the insertion tube.
It was disadvantageous in terms of handling of the push ring.

The purpose of the present invention is to disperse the force exerted by the pressing tool on the insertion tube, and to reduce the size and weight of the pressing ring.

[Means to solve the problem]

The technical means of the present invention taken to achieve the above object is to fit a push ring connected to the socket tube onto the insertion tube whose end is inserted into the socket tube, and to connect the push ring and the insertion tube. In the connecting tube removal prevention structure configured such that the removal prevention device can be pressed against the insertion tube side by a pressing tool provided on the push ring, the following [A] ~
The configuration described in [d] is provided.

[B] The retaining tool has a retaining protrusion on its inner circumferential surface that bites into and engages with the outer circumferential surface of the insertion tube.
In addition, cam surfaces are formed on the outer circumferential surface, each having an inclined position that approaches the outer circumferential surface of the insertion tube as the distance from the socket tube increases.

[B] The removal stopper is composed of a combination of a plurality of divided bodies arranged close to each other in the circumferential direction, and
Each inclined cam surface is formed in an arcuate shape long in the tube circumferential direction and has a length to abut against the plurality of pressing tools.

[C] On the inner peripheral side of the push ring, there is a ring-shaped stopper portion that comes into contact with the end surface of the pull-out side of the pull-out stopper to prevent the pull-out stopper from moving beyond a certain level toward the pull-out side with respect to the push ring; A restriction part having a surface facing the stopper part with the stopper part in between is provided to form a recessed groove-shaped removal stopper storage part.

[d] A reinforcing wall connecting the stopper portion and the regulating portion is formed at each location between adjacent retainers in the tube circumferential direction in the retainer housing portion of the press ring.

[E] The retaining tool is supported by the press ring via a holder that extends between its circumferential end and the reinforcing wall and is elastically deformed or destroyed by the pressing action of the pressing tool.

[Effect]

As a result of taking the above technical measures, the following effects can be obtained.

a The removal stopper is made up of circumferentially long arc-shaped divided bodies arranged close to each other and has a length that allows multiple pressing tools to act, so it cannot be pressed intensively against a part of the insertion tube. Action forces can be avoided.

b Rather than making the stopper part of the push ring thicker in the pulling direction, by forming a reinforcing wall, the stopper part deforms against the external force when the stopper comes into contact with it, that is, in the pulling direction. Since it is designed to prevent deformation, the wall thickness of the stopper part in the pulling direction can be reduced. Moreover, since the reinforcing wall is provided between adjacent retainers in the pipe circumferential direction, the reinforcing wall does not protrude in the pulling direction relative to the push ring, and can be accommodated within the width of the push ring in the pulling direction. I can do it. Furthermore, the reinforcing wall allows positioning of the retainer relative to the press ring in the tube circumferential direction.

c By utilizing the presence of the reinforcing wall, the retainer can be supported by the press ring without increasing the width of the retainer housing in the axial direction.
In other words, the holder of the retainer is not provided so as to be supported in the width direction of the retainer, which is the thickness direction of the press ring, but is placed between the reinforcing wall of the press ring and the circumferential end of the retainer facing thereto. Since the retainer is interposed, there is no need to configure the axial width of the retainer storage part to be as large as the width of the retainer plus the extra width for installing the retainer, and the size of the entire push ring can be reduced. A part of the unaffected circumferential length can be used as a space for installing the holder.

[Effect of idea]

Therefore, the present invention provides a connecting tube that is easy to prevent deformation of the insertion tube, makes the entire pushing ring including the stopper portion lightweight and compact, and is easy to assemble and handle. This has the effect of providing a structure that prevents it from coming off.

〔Example〕

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

1 is a socket pipe, 2 is an insertion pipe connected to the socket pipe 1 by insertion, and 3 is a cast ring that is fitted onto the insertion pipe 2. It is connected to the socket pipe 1 by a main connecting bolt 4 so as to be able to be pulled toward the socket part 1a side of the socket pipe 1.

Between the press ring 3 and the insertion tube 2, a plurality of elongated retainers 5 (made by casting) are installed along the circumferential direction of the tube.
are interposed close to each other in the circumferential direction of the tube, and a retaining protrusion 6 is formed on the inner circumferential surface of the retainer 5 for biting into and engaging with the outer circumferential surface of the insertion tube 2. On the outer circumferential surface of the removal stopper 5, two cam surfaces 7 are formed at two locations spaced apart in the tube circumferential direction, the cam surfaces 7 having an inclined posture that approach the outer circumferential surface of the insertion tube 2 as the distance from the socket tube 1 increases. In addition, the portion of the pull-out stopper 5 that forms the cam surface 7 is formed to protrude more toward the pull-out side than the other portions, as shown in FIG. Further, the retaining protrusion 6 is a long protrusion extending along the insertion side edge of the removal stopper 5, and a short protrusion extending along the pullout side edge of the cam surface forming portion.

A pressing tool 8 is attached to the push ring 3 and presses the removal stopper 5 toward the insertion tube 2 side by contacting the cam surface 7, and an end face on the pull-out side of the removal stopper 5 is attached to the inner peripheral side of the pusher 8. A ring-shaped stopper part 9 has a surface that comes into contact with the stopper part 9 and prevents the removal stopper 5 from moving beyond a certain level toward the pulling side with respect to the push ring 3, and a surface that comes into contact with the insertion side end surface of the removal stopper 5. A recessed groove-shaped removal stopper storage part S in which a ring-shaped restriction part 10 that prevents the lever removal stopper 5 from moving beyond a certain level toward the insertion side with respect to the press ring 3 is provided, and the removal stopper 5 is housed therein. has been formed. Moreover, the push ring 3 has a sealing material 1 interposed between the socket portion 1a and the insertion tube 2 by being drawn toward the socket pipe 1 side.
A ring-shaped pressing piece 12 is continuously provided for pressing the tube 1 from the tube axis direction to press the tube 1 onto the socket 1a and the insertion tube 2. The pressing tool 8 includes an abutting member 8a that comes into contact with the stopper 5, and a push bolt 8b that presses the contact member 8a against the stopper 5 from the radial direction of the insertion tube 2.

In addition, in the pull-out stopper storage section S of the press ring 3, a pull-out direction that connects the stopper part 9 and the regulating part 10 and acts on the stopper part 9 is provided between the pull-out stops 5 adjacent in the circumferential direction. A reinforcing wall 13 is formed to absorb the force.

Note that the pressing tool 8 is arranged so as to be located in the center between the adjacent connecting bolts 4.

Reference numeral 14 denotes a holder that holds the stopper 5 on the push ring 3 by inserting both ends thereof into holes formed in end faces of the stopper 5 and the reinforcing wall 13 that face each other in the circumferential direction. is an elastic deformation, or
By breaking it, it is possible to allow the pressing tool 8 to press and move the retaining tool 5 onto the outer circumferential surface of the insertion tube.

According to the above configuration, the cam surface 7 by the pressing tool 8
Due to this pressure, the retaining tool 5 is pressed against the insertion tube 2, and the retaining protrusion 6 bites into and engages with the outer circumferential surface of the insertion tube, whereby initial retaining is performed. and,
When a pulling force is applied to the socket tube 1 and the insertion tube 2, the stopper 5 moves together with the insertion tube 2 with the cam surface 7 sliding against the pressing tool 8, and the cam against the pressing tool 8 moves. Due to the sliding of the surface 7, the pressing force by the pressing tool 8 increases, and the amount of bite of the retaining protrusion 6 into the outer circumferential surface of the insertion tube increases, thereby preventing the retaining projection 6 from being withdrawn against the withdrawal force. Further, when the removal stopper 5 moves integrally with the insertion tube 2 for more than a certain amount, the removal stopper 5 comes into contact with the stopper part 9 and its movement is blocked, and as a result, the removal stopper 6 is formed on the outer circumferential surface of the insertion tube. The amount of biting into the area stops increasing.

[Another example]

Next, another embodiment of the present invention will be shown. In the above embodiment, the pressing tool 8 is attached to the middle two places of the stopper 5.
The number and position of the cam surfaces 7 are determined based on the circumferential length of the retaining tool 5, the number of pressing tools 8, and the required pressing force. do it.

Note that although numbers are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the connection pipe retaining structure according to the present invention, in which FIG. 1 is a longitudinal sectional view of the main part, FIG. 2 is a partially cutaway front view, and FIG. 3
4 is a longitudinal sectional view of the main part, FIG. 5 is a developed view, and FIG. 6 is a perspective view of the retainer. 1...Socket tube, 2...Insertion tube, 3...Press ring, 5
... Removal stopper, 6 ... Removal prevention protrusion, 7 ... Cam surface, 8
... Pressing tool, 9 ... Stopper section, 10 ... Regulating section, 13 ... Reinforcement wall, 14 ... Holding tool, S ... Stopper storage section.

Claims (1)

[Claims for Utility Model Registration] An insertion tube 2 whose end is inserted into the socket tube 1 is fitted with a push ring 3 connected to the socket tube 1, and
Between the push ring 3 and the insertion tube 2, a retaining tool 5 is configured to be able to be pressed against the insertion tube 2 side by a push tool 8 provided on the push ring 3, and further, the following [A] to [E] are provided. A connection pipe retaining structure, characterized by having the configuration described above. [B] The retaining tool 5 has a retaining protrusion 6 on its inner circumferential surface for biting into and engaging with the outer circumferential surface of the insertion tube 2, and on its outer circumferential surface, the insertion tube 2 increases as the distance from the socket tube 1 increases. Each of the cam surfaces 7 is formed in an inclined position approaching the outer peripheral surface of the cam surface 7. [B] The retaining tool 5 is composed of a combination of a plurality of divided bodies arranged close to each other in the circumferential direction, and has a length such that each inclined cam surface 7 comes into contact with a plurality of pressing tools 8. It is formed in an arcuate shape that is long in the circumferential direction. [C] The retainer 5 is provided on the inner circumference side of the press ring 3.
a ring-shaped stopper portion 9 having a surface that comes into contact with the end surface of the pull-out side and prevents the stopper 5 from moving beyond a certain level toward the pull-out side with respect to the press ring 3;
A restriction part 10 having a surface facing the stopper part 9 with the stopper 5 in between is provided to form a groove-shaped removal stopper storage part S. [D] Reinforcing walls 13 connecting the stopper portion 9 and the regulating portion 10 are formed in the retainer storage portion S of the press ring 3 at each location between adjacent retainers 5 in the tube circumferential direction. [E] The retainer 5 is supported by the press ring 3 via a holder 14 that spans between its circumferential end and the reinforcing wall 13 and is elastically deformed or destroyed by the pressing action of the presser 8. has been done.