JPH03265789A - Pipe fitting - Google Patents

Abstract

PURPOSE:To prevent slip out of a spigot from a socket by equipping it with a socket, which has recess, and a cylindrical stopper, which has a tapered face inside the recess and whose diameter can be reduced or enlarged, and besides dividing the stopper into plural parts in the circumferential direction by recesses. CONSTITUTION:A pipe fitting is composed of a socket 10 and a stopper 20. The stopper 10 is a cylindrical body in which the spigot 40 to be connected is inserted, and is provided with a recess 13 which has a tapered face 13a where the diameter is reduced as it approaches an opening 11. The stopper 20 is ar ranged inside the recess 13, and has a tapered face 21 where an angle of inclina tion is larger than that of the taper face 13a of the recess 13, and one part of it is separated by a cut 25, whereby it is becoming a cylindrical body capable of expansion and reduction of the diameter. As a result, the stopper is reduced enough for diameter, and the locking force to the periphery of the spigot becomes strong, and the slip out of the spigot can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe joint used for piping such as water pipes.

(Prior art) Recently, as pipe joints used for water pipes, etc., the fittings of one pipe to be connected can be connected by simply inserting the fitting into the socket of the other pipe. A pipe fitting that can be used has been developed. For example, in Japanese Utility Model Application Publication No. 13087/1987, a ring-shaped stopper that can be contracted and expanded in diameter is provided in a receptacle, and the stopper is attached to a receptacle that is inserted into the receptacle. A pipe joint is disclosed in which the pipe fitting is externally fitted.

The inner peripheral surface of the receptacle is provided with a tapered surface whose diameter gradually decreases toward the opening of the receptacle into which the receptacle is inserted. The retainer disposed within the socket has a notch at one location in the circumferential direction, and is capable of contracting and expanding the diameter. Two tapered surfaces are provided on the outer circumferential surface of the retainer in line with each other in the axial direction, and the boundary between the two tapers protrudes outward. Inner circumferential retaining blades are provided on the inner circumferential surfaces of both ends of the retainer.

In such a pipe fitting, when the insertion port is inserted directly opposite the retainer provided in the socket, the inner tapered surface of the outer peripheral surface of the retainer comes into contact with the tapered surface of the inner peripheral surface of the socket. When they are in contact with each other, both of the latching blades are not latched to the outer circumferential surface of the insertion opening, and the insertion opening is smoothly inserted directly opposite the insertion opening. For example, when the insertion opening is inserted directly opposite the stopper and the insertion opening moves in the direction of coming out from the socket due to the liquid flowing inside, the removal stopper will move against the insertion opening as the insertion opening moves. Move with your mouth. As a result, the tapered surface on the opening side of the outer circumferential surface of the retainer rotates around the boundary of the outer circumferential surface of the retainer so as to come into contact with the inner circumferential surface of the receptacle, and the circumferential surface directly opposite the retainer A latching blade provided at the inner inner end of the receptacle is engaged with the outer peripheral surface of the receptacle, thereby preventing the receptacle from coming off from the receptacle.

(Problem to be Solved by the Invention) In such a conventional pipe joint, when the socket inserted directly opposite the retainer moves in the direction of coming out from the socket, the retainer moves together with the socket and closes the socket. It comes into contact with the tapered surface of the oral cavity. In such a situation, since the retainer has a notch in one place in the circumferential direction, a diameter reducing force is applied to the retainer, causing it to bend at approximately half the circumference. Force acts. If this bending force acting on the retainer is sufficiently large, the retainer will contract in diameter.

The retainer usually has a constant wall thickness over the entire circumferential direction, and a large bending force is required to reduce the diameter by bending approximately half of the circumferential direction. For this reason, if only a low pressure is applied to the insertion port when the insertion port is inserted directly opposite the stopper, the bending force applied to the stopper will be small and the diameter of the stopper will not be reduced sufficiently. There is a risk. In particular, at the beginning of flowing liquid inside,
The pressure of the liquid is low, and the insertion port does not apply enough pressure in the direction of coming out from the socket. As a result, the retainer may not be sufficiently secured to the insertion opening, and the insertion opening may fall out from the socket.

The present invention solves the above-mentioned conventional problems, and its purpose is to make it possible to sufficiently reduce the diameter of the retainer even when the pressure applied to the insertion port inserted directly opposite the retainer is small. Therefore, it is an object of the present invention to provide a pipe joint in which the locking force of the stopper to the insertion port can be strengthened, and there is no fear that the insertion port will fall out from the socket.

(Means for Solving the Problems) The pipe joint of the present invention is a cylindrical body into which an insertion port to be connected is inserted through an opening, and has a tapered surface whose diameter gradually decreases toward the opening. A receptacle in which a recessed groove is provided over the entire circumference of the inner peripheral surface, and a recess in the receptacle is disposed so as to be movable in the axial direction, and the inclination angle with respect to the axial direction is such that the recessed groove is It has a tapered surface set to be larger than the inclination angle of the tapered surface on the outer peripheral surface, and a locking part that locks on the outer peripheral surface of the insertion opening is provided on the inner peripheral surface, and a part of the circumferential direction is separated by a notch. a cylindrical retainer that is capable of contracting and expanding the diameter, and the retainer has a recess that is opened on the circumferential surface so that the wall thickness in the radial direction is thinner. It is characterized by being divided into a plurality of parts in the circumferential direction, thereby achieving the above object.

(Example) The present invention will be described below with reference to Examples.

As shown in FIG. 1, the pipe joint of the present invention includes a cylindrical socket 10 into which a socket 40 to be connected is inserted, and a cylindrical retainer 20 disposed in the socket IO. have

The receptacle IO has an opening 11 at one end into which the insertion port 40 is inserted, and an annular sealing member groove 12 is disposed around the entire circumference on the inner peripheral surface near the opening 11. .

A seal member 30 made of, for example, rubber is fitted in the seal member groove 12 in a liquid-tight manner, and the receptacle 10
When the insertion opening 40 is inserted into the interior, the sealing member 30 fits onto the insertion opening 40 and comes into close contact with the outer peripheral surface of the insertion opening 40 in a liquid-tight manner.

=5 than the sealing member groove 12 in the socket 10
-6- A retainer groove 13 is provided on the inner circumferential surface on the inner back side. A cylindrical retainer 20 is disposed within the retainer groove 13 so as to be movable in the axial direction.

The inner peripheral surface of the retainer groove 13 on the side of the opening 1I of the socket 10 is a tapered surface 13a whose diameter gradually decreases as it approaches the opening 11.

The inner circumferential surface of the concave groove 13 on the inner side connected to the tapered surface 13a is a circumferential surface 13 that is substantially parallel to the axis of the socket IO.
It has become b. The inner side surface 13c of the retainer groove 13 that is connected to the circumferential surface 13b is slightly inclined with respect to the plane orthogonal to the axis so that the axis side is located on the inner side of the socket 10. There is.

A retainer 20 fitted into the retainer groove 13
is a cylindrical body made of steel, for example, and a part of the body in the circumferential direction is separated by a notch 25 so that the diameter can be contracted and expanded.

The retainer 20 has a tapered surface 21 whose outer circumferential surface on the side of the opening 11 of the socket 10 gradually decreases in diameter as it approaches the opening 11. The outer circumferential surface of the innermost side of the socket 10 that is connected to the tapered surface 21 is a circumferential surface 22 having a substantially constant diameter in the axial direction. Further, the end surface 23 of the retainer 20 on the inner side of the socket 10 is substantially parallel to the inner side surface 13c of the recess 13 for the retainer.

The angle of inclination of the tapered surface 21 on the opening 11 side on the outer peripheral surface of the retainer 20 with respect to the axis of the retainer 20 is the axis of the tapered surface 13a on the inner peripheral surface of the retainer groove 13 described above. The angle of inclination is greater than the angle of inclination. Then, both tapered surfaces 13a and 21 are in a state of facing each other.

The inner peripheral surface of the retainer 20 has, for example, five sawtooth locking portions 27a, 27b, 27c, 27d, 27.
e are arranged in parallel in the axial direction in order from the opening 11 side of the socket. These serrated locking portions 27a,
27b.

27c, 27d, and 27e are locked to the outer peripheral surface of the insertion port 40.

The inner diameter of the locking portion 27a, which is the minimum inner diameter of the retainer 20, is equal to the outer diameter of the insertion port 40 inserted into the socket 10 when no diameter expansion force or diameter contracting force is applied to the retainer 20. It is slightly smaller than .

As shown in FIG. 2, the retainer 20 is provided with a recess 28 on the outer periphery of the notch 7 in a portion facing the notch 25. As shown in FIG. The recess 28 is in the shape of a groove cut out in a semicircular shape from the outer circumferential side and opened to the outer circumferential surface.
The portion where 8 is formed has a thinner wall thickness in the radial direction. Additionally, groove-shaped recesses 28 and 28 that are similarly open to the outer circumferential surface are formed in intermediate portions between the recess 28 and the notch 25, respectively. The retainer 20 is divided into three parts in the circumferential direction by the respective recesses 28.

In the pipe joint of the present invention having such a configuration, when inserting the socket 40, the sealing member concave groove 12 of the socket lO is preliminarily inserted.
A sealing member 30 made of, for example, rubber is fitted into the groove 13, and the stopper 20 is fitted into the stopper groove 13. The retainer 20 closes the opening of the receptacle 10 by bringing the opposing end surfaces of the retainer 20 closer to each other across the notch 25 to reduce the diameter of the retainer 20 as a whole. It can be easily inserted from part 11. In particular, since a plurality of recesses 28 are provided on the outer periphery of the retainer 20 at appropriate intervals in the circumferential direction,
Since each circumferential portion divided by each concave portion 28 is easily bent by a relatively small bending force, the diameter of the entire retainer 20 can be easily reduced, and the concave groove 13 for the retainer can be easily reduced in diameter. can be easily located within the

In this state, when the end of the insertion port 40 is inserted through the opening 11 of the socket IO, the end of the insertion port 40 will fit into the seal member 30 and then enter the retainer 20. try to. At this time, the inner diameter of the retainer 20 is
Because it is slightly smaller than the outer diameter of the insertion port 40,
The distal end surface of the insertion port 40 moves the retainer 20 inside the retainer groove 13 to the inner side of the receiving opening 10; It is pressed against the side surface 13c. The outer peripheral surface of the tip of the insertion port 40 has a tapered shape that gradually decreases in diameter as it approaches the tip.
The tapered portion on the outer periphery of the tip of the insertion port 40 is
The insertion port 40 enters into the stopper 20 while expanding the diameter of the stopper 20 by slidingly contacting the tapered surface 26 of the inner circumferential surface of the opening ll side of the socket IO in the stopper 20 . At this time, a retainer 20 is attached to the outer peripheral surface of the insertion port 40.
A locking portion 27a disposed on the opening Il side of the socket 10 in the
The insertion port 40 is easily inserted into the retainer 20 with a small insertion force. Furthermore, even if the insertion port 40 is inserted into the socket 10 in a state that is inclined with respect to the axis of the socket 10, the tapered surface of the outer circumferential surface of the distal end of the insertion port 40 is on the opening ll side of the retainer 20. Since it is guided by the tapered surface 26 on the inner peripheral surface, it can be easily inserted into the retainer 20.

When the end of the socket 40 is inserted into the socket 10 to a predetermined length in this manner, clean water or the like flows from the socket 10 into the socket 40. As a result, the insertion port 40 moves in the direction in which it comes out of the socket 10. As the insertion opening 40 moves, the retainer 20 fitted onto the insertion opening 40 moves integrally with the insertion opening 40. At this time, the respective inclination angles of the tapered surface 13a of the retainer groove 13 and the tapered surface 21 of the retainer 20 with respect to the axis of the socket 10 are as described above.
Since the inclination angle of the tapered surface 21 of 0 is larger, the boundary between the tapered surface 21 and the circumferential surface 22 of the stopper 20 hits the tapered surface 13a of the recess 13 for the stopper. The retainer 20 rotates around the boundary. At the same time, a diameter reducing force acts on the retainer 20, causing the retainer 20 to
The locking portion 2 has a reduced diameter and is adjacent to the locking portion 27a provided on the opening ll side of the socket 10 in the retainer 20.
7b is locked to the outer circumferential surface of the socket 40 together with the locking portion 27a that has already been locked to the socket 40.

In this state, when the socket 40 further moves in the direction in which it comes out from the socket 10, the retainer 20 also moves from the socket 4.
0, the retainer 20 further rotates around the boundary between the tapered surface 21 and the circumferential surface 22 of the retainer 20, and its diameter decreases, and the retainer 20
A locking portion 27c adjacent to the locking portion 27b on the inner peripheral surface of the slot 40 further locks on the outer peripheral surface of the insertion port 40. Similarly, when the insertion port 40 moves further in the direction in which it comes out, the locking portion 2 of the retainer 20 that is adjacent to the locking portion 27c that has already been locked to the outer circumferential surface of the insertion port 40
7d and 27e are sequentially engaged with the outer peripheral surface of the insertion port 40.

At this time, since the retainer 2o is divided into three parts in the circumferential direction by the two recesses 28 opening on the outer circumferential surface, the diameter reducing force acting on the retainer 20 is
A bending force is applied to each circumferential portion. As a result, even if a relatively small diameter reducing force acts on the retainer 20, each circumferential portion of the divided three parts is reliably bent, and the entire retainer 20 is reliably reduced in diameter. be done. As a result, each of the locking portions 27a to 27e of the retainer 20 is reliably locked to the outer circumferential surface of the insertion port 40, and the insertion port 40 is prevented from coming off.

By making the depths of the recesses 28 of the retainer 20 equal, the thickness of the thinner portion of the retainer 20 becomes equal, and therefore the recesses 28 are divided by the recesses 28. In response to a bending force applied to each circumferential portion of the state, each bends in a similar state.

The concave portion 28 of the retainer 20 is not limited to the configuration in which it is opened on the outer circumferential surface of the retainer 20 as described above.

Further, the circumferential spacing between the respective recesses 28 and the number thereof are not limited to those in the above embodiment.

For example, as shown in FIG. 3, four recesses 28° opening to the inner circumferential surface are formed at appropriate intervals in the circumferential direction on the inner peripheral side of the retainer 20 to prevent the retainer from coming off. The tool 20 may be divided into five parts in the circumferential direction, and as shown in FIG.
Seven recesses 28 open alternately on the inner and outer circumferential surfaces.
The retaining member 20 may be divided into eight circumferential portions by forming “.

The cross-sectional shape of each recess 28 is not particularly limited, and examples include a rectangular shape as shown in FIG. 5, a U-shape as shown in FIG. 6, a ■-shape as shown in FIG. As shown in FIG. 8, each corner may be rounded in a square shape, or as shown in FIG. 9, it may be widened into a flattened circular shape.

(Effects of the Invention) In this way, the pipe joint of the present invention is divided into a plurality of parts in the circumferential direction because the retainer is divided into a plurality of parts in the circumferential direction by the recess that opens on the circumferential surface. By applying a small bending force to each part, each part is easily bent, and the entire retainer is easily reduced in diameter. As a result, even if the pressure applied to the insertion port in the withdrawal direction is low when the insertion port is initially inserted directly opposite the stopper, the diameter of the stopper is sufficiently reduced, and the The locking force on the outer circumferential surface of the socket is increased, and the socket is reliably prevented from falling out of the socket.

４、゛の、な！ l Fig. 1 is a partially cutaway sectional view showing an example of the pipe joint of the present invention, Fig. 2 is a front view showing a retainer used in the pipe joint, and Figs. 3 and 4 are a retainer. A front view showing another embodiment of the tool and FIGS. 5 to 9 are explanatory diagrams showing the cross-sectional shape of the recess of the retainer.

10...Socket, 11...Socket opening, 13.
...concave groove of the socket, 13a...tapered surface of the socket,
20... Retainer, 21... Tapered surface of the retainer, 25... Notch, 27a, 27b, 2
7c, 27d, 27e-locking part, 28.28°, 2
8-・--15=

Claims (1)

[Claims] 1. A cylindrical body into which the socket to be connected is inserted through an opening, and a concave groove having a tapered surface that gradually decreases in diameter as it approaches the opening side extends over the entire inner peripheral surface. A receptacle provided around the circumference, and a recessed groove of the receptacle, which is disposed so as to be movable in the axial direction, and an angle of inclination with respect to the axial direction is larger than an angle of inclination of the tapered surface of the recessed groove. In addition to having a set tapered surface on the outer circumferential surface, a locking part that locks on the outer circumferential surface of the insertion opening is provided on the inner circumferential surface, and a part of the circumferential direction is separated by a notch to allow diameter reduction and diameter expansion. A cylindrical slip-off stopper is provided, and the slip-off stopper is divided into a plurality of parts in the circumferential direction by a recess that is opened in the circumferential surface so that the wall thickness in the radial direction is thinner. A pipe joint characterized by being in a state of being