JPH0610513B2 - Connection pipe retainer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an insertion-connected pipe such as a water pipe or a gas pipe, and a retaining portion on the side of the receiving pipe and an insertion connected to the receiving pipe. The present invention relates to a retaining device that is interposed between a pipe and a plurality of pipes in the circumferential direction of the pipe to prevent the pipe from coming off. Specifically, a retaining body provided between the retaining portion on the side of the receiving tube and the insertion tube inserted and connected to the receiving tube is provided, and in the central portion in the circumferential direction of the retaining body, The cam surface, which is pressed by the bolt attached to the retaining portion to move the retaining body against the insertion tube, is formed in an inclined posture in which the insertion direction of the insertion tube is farther from the outer peripheral surface of the insertion tube. On the surface of the stopper body facing the insertion tube, a retaining projection that bites into the outer peripheral surface of the insertion tube along with the pressing movement is formed over the entire width in the tube circumferential direction, and the retaining body is The present invention relates to a retaining device for a connecting pipe, which has a retaining surface that contacts the stopper surface formed in the retaining portion in the extraction direction to retain the retaining body with respect to the retaining portion.

[Conventional technology]

In such a connection pipe retainer, the cam surface is pressed by the tightening of the bolt to push the retainer body against the insertion pipe, causing the retainer protrusion to bite into the outer peripheral surface of the insertion pipe, thereby Will be stopped. On the other hand, when a strong withdrawal force is applied between the inlet pipe and the insertion pipe due to ground subsidence, etc., the cam surface moves against the bolt when the retainer body moves together with the insertion pipe in the withdrawal direction due to the withdrawal. As the pressing force on the cam surface is increased by the bolt in the sliding state, the retaining body is pressed against the insertion tube more strongly, and as a result, the retaining projection bites deeper into the insertion tube, which results in extraction that resists the pulling force. Stopping is done.

Further, since the retaining projection is formed over the entire width in the circumferential direction of the pipe, the pressing force to the insertion pipe due to the pressing of the cam surface of the bolt is dispersed in the circumferential direction to apply the pressing force to the cam surface of the bolt. In comparison with the above, it is possible to reduce the amount of the retaining projection protruding into the outer peripheral surface of the insertion tube. As a result, when the inner surface of the thin insertion tube is mortar-lined, the deformation of the insertion tube due to the biting of the retaining projection is reduced, and the mortar lining is not cracked or dropped due to the deformation of the insertion tube. It is useful for prevention.

In the conventional retainer for a connection pipe, the end face of the retainer main body in the drawing direction is flat over the entire width in the pipe circumferential direction, and this end face is in contact with the stopper surface formed on the retainer portion. A retaining surface was formed (for example, Japanese Utility Model Laid-Open No. 57-25287).

[Problems to be solved by the invention]

However, with the retaining device, when pulling force acts on the receiving pipe and the insertion pipe, slide the cam surface against the bolt and push the retaining body against the insertion pipe to move it. In order to increase the amount of protrusion protruding into the outer peripheral surface of the insertion tube and increase the retaining force, it is necessary to secure a sufficient amount of sliding of the cam surface with respect to the bolt by making the length of the cam surface sufficient. Therefore, in the case of the above-described conventional retainer, the retainer surface is located at the extreme end of the retainer body in the pull-out direction.

On the other hand, in the retaining portion, when the retaining surface of the retaining member is brought into contact with the stopper surface to prevent retaining, the stopper surface is prevented from being deformed or damaged, and the retaining surface is securely retained.
In addition, in order to perform strongly, it is necessary to secure a sufficient thickness of the stopper portion forming the stopper surface in the pulling-out direction to ensure the strength of the stopper portion.

Therefore, in the case of using the conventional retaining tool for the connecting pipe, the width of the retaining portion in the pulling direction becomes large, and the retaining portion becomes large.

An object of the present invention is to provide a retainer for a connection pipe that can reliably retain the retainer without increasing the size of the retainer.

[Means for solving problems]

According to the present invention, when the retaining body is pressed against the insertion tube and moved by the bolt, it is not necessary to form the cam surface on the entire retaining body, and it is sufficient to form the cam surface only on the central portion of the retaining body. That is, it is necessary to form a cam surface on the projecting portion, and as a result, the width of the projecting portion in the pull-out direction is not restricted by the cam surface. And, the characteristic configuration of the retainer for a connecting pipe according to the present invention based on the attention is
Of the retaining body, the pull-out direction end faces of the overhanging portions that are continuous with both sides of the central portion are positioned on the insertion direction side with respect to the pull-out direction end faces of the central portion,
The retaining surface is formed by the end face of the projecting portion in the pulling direction, and the action and effect thereof are as follows.

[Work]

Since the retaining surface is located in the middle of the pulling direction of the retaining body, the stopper surface of the retaining portion that abuts the retaining surface can be inserted into the retaining body from the inserting direction when viewed in the pipe circumferential direction. As a result, while sufficiently securing the width of the stopper portion of the stopper portion forming the stopper surface in the pull-out direction, the amount of protrusion of the stopper portion in the pull-out direction from the stopper body is reduced, The width of the stopper in the pull-out direction can be reduced. Moreover, since the central portion of the retaining body is wider than the overhang portion in the pulling direction, the cam surface length formed in the central portion can be sufficiently secured, and as a result, the insertion tube and the receiving tube When the pulling force is applied to the, the slippage of the cam surface with respect to the bolt should be sufficient to ensure that the retaining body is pressed against the insertion tube, increasing the amount of engagement of the retaining projection with the outer peripheral surface of the insertion tube. be able to.

〔The invention's effect〕

Therefore, the present invention, while achieving the downsizing of the retaining portion, by the synergism of ensuring the engagement of the retaining projection with the outer peripheral surface of the insertion tube and ensuring the retaining body of the retaining body by the retaining portion, It has become possible to provide a retaining device for a connecting pipe that can reliably and securely retain the connecting pipe.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

(1) is an inlet pipe, (2) is an insertion pipe inserted into and connected to the inlet pipe (1), (3) is a push ring fitted on the insertion pipe (2), The push ring (3) is connected to the receiving pipe (1) by a plurality of connecting bolts (4) around the pipe axis so as to be drawn toward the receiving portion (1a) side of the receiving pipe (1). .

The push ring (3) is formed with a retaining portion (5), and when the push ring (3) is pulled toward the receiving pipe (1) side, the receiving port is formed.
A ring-shaped pressure that presses the sealing material (6) interposed between (1a) and the insertion tube (2) from the axial direction of the tube to press it into the socket (1a) and the insertion tube (2). Pieces (3a) are arranged in series.

Between the retaining portion (5) of the push ring (3) and the insertion tube (2), a plurality of retaining tools (7) are interposed at intervals in the circumferential direction.

A plurality of circumferential bolts (8) are attached to the retaining portion (5) to press the retaining stoppers (7) to move them against the outer peripheral surface of the insertion tube (2).

The retainer (7) is a central portion (7) in the longitudinal direction of the retainer body (7A) having the pipe circumferential direction as the longitudinal direction and the drawing direction as the width direction.
In (a), a cam surface (7B) that is pressed by the bolt (8) and presses and moves the retaining body (7A) against the insertion tube (2) is formed, and the insertion tube of the retaining body (7A) ( On the surface facing 2), a retaining projection (7C) that bites into the outer peripheral surface of the insertion tube (2) along with the pressing movement is formed over the entire length in the longitudinal direction.

The cam surface (7B) is formed in an inclined posture in which the cam surface (7B) moves away from the outer peripheral surface of the insertion tube (2) toward the insertion direction side of the insertion tube (2). In other words, the retaining device (7) slides the cam surface (7B) with respect to the bolt (8) when the insertion tube (2) and the socket tube (1) are subjected to a pulling force higher than the set value. By further pressing and moving the insertion tube (2) onto the insertion tube (2), the amount by which the retaining projection (7C) bites into the outer peripheral surface of the insertion tube (2) is increased.

Of the retaining body (7A), the protruding portions (7b) connected to both sides of the central portion (7a) protrude outwardly from the cam surface (7B) in a longitudinal view as shown in FIG. The end face (b) in the pulling direction is formed so as not to be located in the insertion direction side of the end face (a) in the pulling direction in the central portion (7a).

And, the end face in the pull-out direction in the overhang portion (7b)
With (b), the stopper surface formed on the retaining part (5)
Abut the (S) in the pull-out direction and hold the retaining body (7A)
A retaining surface (9) is formed for retaining against (5).
Therefore, the stopper surface (S) of the retaining portion (5) enters the insertion side from the end surface (a) of the central portion (7a) in the longitudinal direction of the retaining body (7A), The thickness of the stopper portion (5A) forming the stopper surface (S) in the drawing direction becomes large.

The retaining projections (7C) are ridges continuous in the longitudinal direction of the retaining body (7A) in a posture along the longitudinal direction, and are formed at both ends in the inserting direction of the facing surface.

Moreover, a portion of the retaining portion (5) corresponding to the retaining member (7) is formed to be recessed outward, and an inner portion corresponding to the overhang portion (7b) of the retaining member (7). The peripheral surface portion (5b) is formed so as to protrude inward from the cam surface (7B), that is, the inner peripheral surface portion (5a) corresponding to the central portion (7a).

(10) is a hole (1) formed in the stopper (7) and the stopper (5).
It is a mounting tool that attaches the retaining device (7) to the retaining portion (5) in a positioned state by inserting it over 1a) and (11b). When the tool (7) moves, it is made of rubber, styrofoam, or the like so as to be broken or deformed to allow the movement of the retaining tool (7).

According to the above-described embodiment, normally, the retaining body (7A) is pressed against the insertion tube (2) by pressing the cam surface (7B) with the bolt (8), and the retaining protrusion (7C) is inserted. It is retained by cutting into the outer peripheral surface of the pipe (2), and when pulling force acts on the insertion pipe (2) and the socket pipe (1), the cam surface (7B)
While slipping on the bolt (8), the retaining body (7A) is pushed against the insertion tube (2) and moved, and the retaining projection (7C) is inserted into the insertion tube (2).
The increase in the amount of biting into the outer peripheral surface prevents the pullout force from pulling out. And the retaining surface (9) is the stopper surface
By coming into contact with (S), movement of the retaining body (7A) in the pulling direction is prevented.

Alternatively, the retaining portion (5) and the receiving pipe (1) may be directly formed.

[Brief description of drawings]

Drawing shows an embodiment of a retaining device for a connecting pipe according to the present invention,
FIG. 1 is a longitudinal sectional view of a main part, FIG. 2 is a longitudinal sectional view, FIG. 3 is a lateral sectional view, FIG. 4 is a perspective view of a retaining tool, and FIGS.
FIG. 6 is a vertical cross-sectional view of the main part showing the retaining function, and FIG. 6 is a cross-sectional view of the main part. (1) …… Receiving tube, (5) …… Retaining part, (2) …… Insertion tube, (7
A) …… Prevention body, (7a) …… Center part, (7B) …… Cam surface, (8) …… Bolt, (7C) …… Prevention protrusion, (7b) …… Overhanging part, (S ) …… Stopper surface, (9) …… Prevention surface.

Claims (1)

[Claims] 1. A retaining part (5) on the side of the receiving pipe (1) and the receiving pipe.
Provide a retaining body (7A) that is inserted between the insertion tube (2) that is inserted into (1) and connect the retaining body to the central portion (7a) of the retaining body (7A) in the pipe circumferential direction. The cam surface (7B) that is pressed by the bolt (8) attached to the part (5) and pushes the retaining body (7A) against the insertion tube (2) is moved toward the insertion direction side of the insertion tube (2). Formed in an inclined posture away from the outer peripheral surface of the insertion tube (2), on the surface of the retaining body (7A) facing the insertion tube (2), the outer peripheral surface of the insertion tube (2) along with the pressing movement. Form a retaining projection (7C) that bites into the pipe in a state of spanning the entire width in the pipe circumferential direction, and
The retaining body (7A) abuts the stopper surface (S) formed on the retaining portion (5) in the pulling direction to retain the retaining body (7A) with respect to the retaining portion (5). A retainer for a connecting pipe having a retaining surface (9), wherein the retaining body (7A) has an overhanging portion (7b) connected to both sides of the central portion (7a).
The end face in the pull-out direction in is located closer to the insertion direction side than the end face in the pull-out direction in the central portion (7a), and the pull-out prevention face (9) is formed by the end face in the pull-out direction of this overhanging portion (7b). A stopper for connecting pipes.