JPH068394Y2 - Sleeve for pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sleeve for a pipe joint, and more specifically, it is provided outside the insert portion of the joint body so as to be movable in the direction of the central axis. The present invention relates to a pipe joint sleeve in which a pipe is inserted between and to lock and connect the pipe.

[Conventional technology]

Conventionally, this type of joint sleeve has been publicly known, but most of the conventional sleeves are made of metal and have a simple annular or cylindrical shape.

[Problems to be solved by the device]

For this reason, in the conventional sleeve for pipe fittings, if the error in the outer diameter dimension or the wall thickness of the pipe to be inserted / connected becomes large, the insertion becomes impossible in many cases. It was so low that it was virtually impossible to connect such a tube.

In addition, since the conventional sleeve is manufactured by machining a metal rod material or a pipe material, it is troublesome to manufacture and the cost is high.

Therefore, the purpose of this invention is to be able to connect to a pipe joint and to hold the pipe with a very large force even if the outer diameter dimension and wall thickness of the pipe to be inserted / connected are considerably large. There is a sleeve for a pipe joint which can hold a pipe stably.

Another object of the present invention is to provide a sleeve for a pipe joint which is very easy to manufacture and can be manufactured at low cost.

[Means for Solving the Problems]

In order to achieve the above object, the present invention takes the following technical means.

That is, at least two portions (1a) that are formed of synthetic resin and that are connected by the fulcrum portion (10) and that can be displaced in the radial direction with the fulcrum portion (10) as the fulcrum.
(1b), each of the portions (1a) (1b), at least two slits (8) formed from the pipe insertion side, and the slits (8) from the joint body side substantially aligned with each. It is characterized by being formed by at least two other slits (9) formed as described above.

It is preferable that each of the slits (8) and (9) is formed so as to extend in the substantially central axis direction.

A step portion adapted to press the surface of the pipe can be provided on the inner surface of the joint body side.

[Action]

 The above technical means operates as follows.

When the pipe (30) is inserted into the sleeve (1) while inserting it into the insert part (23) of the joint body (21), if internal pressure or external force acts on the pipe (30), A force that moves to the tube insertion side acts. This force causes the sleeve (1) to move to the tube insertion side together with the tube (30), so that the tube insertion side part of the sleeve (1) presses the tube swelling part (26) or the like provided on the insert part (23). The parts are pushed outward in the radial direction.

Due to this displacement of the tube insertion side part, at the same time the sleeve (1)
The respective parts (1a), (1b) rotate around the fulcrum part (10) as a fulcrum, and the joint body side part is pushed inward in the radial direction.

In this way, the pipe pressing part of the insert part (23) and each part (1a) (1a)
At the same time that the pipe (30) is pressed and pinched between the pipe insertion side parts of b), the joint body side of each part (1a) (1b) presses the outer surface of the pipe (30), and its corner (7) Can be locked by.

If the outside diameter of the pipe (30) is larger than the reference value, the pipe insertion side part of each part (1a) (1b) spreads slightly outward in the radial direction with the fulcrum part (10) as the fulcrum, and the pipe (30) is inserted. It becomes possible to do.
After that, the tube (30) can be locked and pinched in the same manner as described above.

When the outer diameter of the pipe (30) is smaller than the reference value, insert the pipe (30) into the sleeve (1) and come closer to the pipe insertion side than when the outer diameter of the pipe (30) is the reference value. In this way, the sleeve (1) may be moved to the pipe pressing portion of the insert portion (23). Each part (1a)
By the outward displacement of the pipe insertion side portion of (1b), the joint body side of each portion (1a) and (1b) is displaced inward in the same manner as described above, and the pipe
(30) can be locked and pinched.

〔Example〕

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

1 to 3, (1) is a sleeve for a pipe joint according to the present invention, which is manufactured by molding a synthetic resin. The sleeve (1) has a substantially cylindrical shape, and an annular protrusion (2) protruding inward is formed at a substantially central portion of the inner surface.

On the tube insertion side of the protruding part (2), a pressing surface with a tapered cross section for pressing the pipe from the protruding part (2) to the end
(3) is formed. Therefore, this pressing surface (3) is
It is a truncated cone shape whose inner diameter increases from the edge of (2) toward the open end.

A cylindrical surface (4) is provided following the protrusion (2) on the side opposite to the pipe insertion side of the protrusion (2), that is, on the joint body side. The inner diameter of the cylindrical surface (4) is larger than the inner diameter of the protrusion (2).

In this embodiment, another cylindrical surface (5) is provided from the cylindrical surface (4) to the end. The inner diameter of the cylindrical surface (5) is larger than the inner diameter of the cylindrical surface (4). Therefore, the two cylindrical surfaces (4) and (5) are arranged side by side in a stepwise manner between the protruding portion (2) and the opening end portion.
Further, a corner (6) which is substantially right angle is formed at the end of the cylindrical surface (4), and a corner (7) is similarly formed at the end of the cylindrical surface (5), that is, the open end.

As shown in FIG. 1, four slits (8) and (9) are formed on the cylindrical side wall of the sleeve (1) in the central axis direction. The two slits (8) provided on the tube insertion side are at positions facing each other with respect to the central axis, and have a truncated cone-shaped pressing surface.
It extends beyond (3) to the protrusion (2). The other two slits (9) provided on the joint body (2) side are the both slits (8).
Are arranged in line with each of the above. This slit (9) goes beyond the outer cylindrical surface (5) to the inner cylindrical surface.
It has reached (4). In this embodiment, the slit (8) on the tube insertion side is slightly longer than the slit (9) on the joint body side.

Narrow fulcrums (10) are formed between the ends of the two slits (8) and (9) aligned in a straight line. Therefore, by the four slits (8) (9) and the two fulcrums (10),
The sleeve (1) has two parts (1
It is divided into a) and (1b).

As described above, since the sleeve (1) is made of synthetic resin, it has some flexibility. Therefore, by doing this, the two substantially semi-cylindrical parts (1a) (1b)
Can be rotated in the radial direction with the two fulcrums (10) as fulcrums.

The inner diameter (a) of the protrusion (2) is slightly smaller than the outer diameter of the tube to be inserted, and the inner diameter (b) (c) of the cylindrical surface (4) (5) is larger than the outer diameter of the tube. It is set. Therefore, at the time of insertion, the tube is inserted while being slightly pressed from the outside by the protrusion (2), and is not pressed by the cylindrical surfaces (4) and (5). In addition, the inner diameter of the conical trapezoidal pressing surface (3) is the inner diameter of the protrusion (2) in all parts.
Since it is larger than (a), the tube is not pressed by the pressing surface (3).

Incidentally, (11) is a through hole formed along the central axis inside the sleeve (1), and (12) is a corner formed at the boundary between the protrusion (2) and the pressing surface (3). .

The sleeve (1) having the above structure can be formed by injection molding of synthetic resin without post-processing because the through hole (11) and the slits (8) and (9) can be removed by a mold at the time of molding. It is possible.

The pipe joint sleeve (1) is used for a pipe joint as shown in FIG.

In FIG. 4, the pipe joint (20) is composed of a joint body (21) and the sleeve (1) having the above-mentioned configuration. The joint body (21) is provided with an engaging collar (22) that engages a wrench or the like when it is attached to a device in a substantially central portion, and an insert portion (23) for inserting a pipe is provided at one end thereof and at the other end thereof. A screw part (24) for attaching to the device is provided. The sleeve (1) is arranged so that both cylindrical surfaces (4) and (5) come to the side of the engaging flange (22), and is attached to the outside of the insert part (23) so as to be movable in the central axis direction. .

The insert portion (23) has a cylindrical portion (25) formed on the side of the engaging collar (22) and a bulging portion having a substantially trapezoidal cross section formed at the end opposite to the engaging collar (22) ( 26) and consist of. Cylindrical part (2
The outer diameter (d) of 5) is made slightly smaller than the inner diameter of the pipe in the state of being inserted in this cylindrical portion (25), and the outer diameter (e) of the bulging portion (26) is smaller than the inner diameter of the pipe. It is formed quite large.

Therefore, when inserting the pipe into the insert part (23), it is necessary to pass the bulging part (26) while pushing the pipe open, and when passing through the bulging part (26), the pipe has a synthetic resin. The elasticity reduces the diameter and follows the cylindrical portion (25) as shown in FIG. Since the tube is made of synthetic resin or rubber, insertion work is easy.

The bulging portion (26) forms a pipe pressing portion that inserts a pipe between the bulging portion (26) and the sleeve (1) to press and clamp the pipe.

The process of connecting the pipe to the pipe joint (20) configured in this way is
It is as follows.

First, the sleeve (1) is moved to a position where it is almost in contact with the engaging collar (22), and in this state, the pipe (30) is inserted into the insert part (23).
Insert it into the bulge (26) of the
Push it between the sleeve (1) and the insert (23) until it abuts against (22).

Next, as shown in FIG. 4 (a), only the sleeve (1) is moved to the tube insertion side, and the frustoconical pressing surface (3) is inserted through the tube (30).
It is brought into contact with the pressing surface (27) of a truncated cone shape provided on the bulging portion (26). In this state, the two portions (1a) and (1b) of the sleeve (1) only slightly expand due to the pressing force of the sleeve (1). The distance (f) between the pressing surface (27) of the bulging portion (26) and the pressing surface (3) of the sleeve (1) is substantially equal to the thickness of the tube (30).

Finally, pulling the tube (30) strongly in the above state, the sleeve
Since the protruding part (2) of (1) presses the pipe (30), the sleeve
(1) moves in the same direction as the pipe (28). In this state,
As shown in FIG. 4 (b), the distance (f) between the pressing surface (27) of the bulging part (26) and the pressing surface (3) of the sleeve (1) is more than the thickness of the pipe (30). Is much smaller, and the tube (30) can be pressed and pinched.

At this time, the corner (12) of the boundary between the pressing surface (3) and the protrusion (2) is
Since it bites into the surface of 0), the clamping force increases.

Further, the tube insertion side of the sleeve (1) is pushed outward by the surface (27) of the insert portion (23) in the radial direction as the sleeve (1) moves. Therefore, the two parts (1a) (1b) of the sleeve (1) are
As indicated by the arrow in the figure, the tube insertion side is displaced outward with the fulcrum portion (10) as the fulcrum. On the contrary, the joint body side is displaced inward by the principle of "lever". Thus, both cylindrical surfaces
The corners (6) and (7) of the (4) and (5) bite into the surface of the pipe (30) and can firmly lock the pipe (30). This locking force is proportional to the pulling force of the tube (30).

When removing the tube (30), push the tube (30) to remove the sleeve (1).
Should be moved to the joint body (21) side. When the sleeve (1) moves, the pressure on the tube (30) is removed,
It can be easily removed by pulling out the tube (30) while holding down (1).

In the above embodiment, the two cylindrical surfaces (4) and (5) are provided, but it is needless to say that the number may be one.
The number of (8) and (9) is not particularly limited as long as at least two can be provided to divide the sleeve (1) into at least two parts.

[Effect of device]

As is clear from the above description, when the sleeve (1) for pipe fittings of the present invention is used, it is displaceable in the radial direction by the slits (8) (9) and divided into at least two parts (1a) (1b). Therefore, even if there is a considerable error in the outer diameter dimension or wall thickness of the pipe (30), it can be connected to the pipe joint (20), and the force that clamps the pipe (30) is The holding force of the pipe (30) is very large because it increases in proportion to the pulling force of (30).

Further, regardless of the error of the pipe (30), stable holding performance is exhibited, and the pipe (30) can be held as in the case where the outer diameter is the reference value.

Further, this sleeve (1) can be easily manufactured by injection molding and can be used without any post-processing, so that it is very easy to manufacture and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a sleeve for a pipe joint according to the present invention. FIG. 2 is a sectional view taken along the slit of the sleeve. FIG. 3 is a right side view of the sleeve. FIG. 4 is a sectional explanatory view showing a usage state of the sleeve,
(a) shows a state in which the pipe is inserted, and (b) shows a state in which the inserted pipe is pulled to lock the pipe. (1) …… Sleeve for fittings, (1a) (1b) …… Part (2) …… Projection, (3) …… Pressing surface (4) (5) …… Cylinder surface, (6) (7 ) …… Corner (8) (9) …… Slit, (10) …… Support point (11) …… Through hole, (12) …… Corner (20) …… Pipe joint, (21) …… Coupling body (23) …… Insert part, (25) …… Cylindrical part (26) …… Bulging part, (27) …… Pressing surface (30) …… Pipe

Claims (3)

[Scope of utility model registration request] 1. A sleeve for a pipe joint, which is provided outside the insert portion of the joint body so as to be movable in the central axis direction,
A tube is inserted between the sleeve and the insert section, and the tube is pressed and held by the tube insertion side of the sleeve and the tube pressing section of the insert section. And at least two parts connected by a fulcrum part and displaceable in the radial direction with the fulcrum part as a fulcrum, each part being at least two slits formed from the tube insertion side and A sleeve for a pipe joint formed from at least two other slits formed so as to be substantially aligned with each of the slits from the joint body side. 2. The pipe joint sleeve according to claim 1, wherein each of the slits extends substantially in the central axis direction. 3. The pipe joint sleeve according to claim 1, wherein a step portion is provided on the inner surface of the joint body side, and the corner of the step portion presses the surface of the pipe.