JPH0517289U - Buried pipe fittings - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a joint for a buried pipe, which is strong and provides a stable retaining force. [Structure] Joint body (12), fastening member (18) screwed to the body, lock ring (30), and bait member (36)
The lock ring includes a circular ring portion (31) having a plurality of long holes (34) formed in the axial direction, and a V shape radially outward from one end of the circular ring portion corresponding to each long hole. The bent portion 33 is bent in a circular shape, and the eating member is attached to the annular portion at the elongated hole portion so that the eating member is prevented from falling off and is movable along the elongated hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a buried pipe joint, and more particularly, to a buried pipe joint for connecting pipes by fastening a fastening tool to the joint body to cause the batting member to bite the outer circumference of the pipe.

[0002]

[Prior Art]

 Buried pipes used for water supply pipes, etc. allow for a slight angle change at the joint part in consideration of the weight of a vehicle traveling on the ground or an external force such as ground subsidence, and in the axial direction. Can also be expanded and contracted by sliding relative to the joint.

Conventionally, various types of such buried pipe joints have been provided, but they have a relatively large number of parts, and have problems such as loss of parts, prolonged assembly work, and error in work procedure. There were many things.

Accordingly, the applicant proposed a buried pipe joint disclosed in Japanese Utility Model Publication No. 3-34543 to solve these problems.

This joint includes a joint main body having a hole into which a pipe to be connected is inserted, a screwing portion screwed into an end portion of the joint main body, and a diameter gradually increasing toward the screwing portion. A fastening member having an inner peripheral wall that operates, a lock ring that contacts the inner peripheral wall of the fastening member, and a batting member that cooperates with the lock ring. By attaching the attached member to the outer circumference of the pipe through the lock ring, the pipe and the joint are connected to each other.The lock ring has an annular portion with a plurality of through holes and a circumferential direction. At the position corresponding to the position of the through hole, it is composed of a plurality of bent portions that are bent from one end of the annular portion toward the outer side in the radial direction to form a substantially V shape. From each through hole of the ring part, a part of the eating member is inside the ring part. It is sandwiched between the annular portion and each of the bent portions in a state of protruding to the portion. Then, when the fastening member is screwed into the joint body, the inclined inner peripheral wall of the fastening member comes into contact with the bent portion of the lock ring, gradually reducing the diameter of the lock ring, and the bait member is attached to the outer circumference of the pipe through the bent portion. It is designed so that it can be pressed against and eaten.

In the above joint, the lock ring and the batting member are integrally assembled, so that the handling is simple and the problems of the above-mentioned conventional example are solved. It is effective.

[0007]

[Problems to be solved by the device]

 However, in the above joint, when pulling force acts on the connected pipes, the presence of the lock ring sometimes allows the bait member to move toward the smaller diameter side of the inner wall of the fastening member as the pipe moves. Variation occurs, and as a result, the pipe withdrawal prevention force varies.

In order to prevent this variation, as shown in FIG. 1 of Japanese Utility Model Publication No. 3-34543, a groove is formed on the outer circumference of the pipe to be inserted, and the biting member is eaten into this groove. It is effective to attach them.

However, forming the groove on the outer circumference of the pipe is a tedious work, and it is also necessary to confirm that the batting member is fitted into the groove when inserting the pipe. Therefore, from the viewpoints of work simplification and cost reduction, it is desirable that sufficient withdrawal prevention can be obtained without forming a groove in the pipe.

[0010]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and in a joint as shown in Japanese Utility Model Publication No. 3-34543, the through hole formed in the annular portion of the lock ring is long in the axial direction. It is a hole, and the biting member is such that a part of it protrudes into the inside of the annular part and is sandwiched between the annular part and each bent part so that it can move along this elongated hole. is there.

[0011]

[Action]

 Therefore, when the pulling force acts on the pipe, the biting member moves along the elongated hole along the elongated hole toward the small diameter side of the inner wall of the fastening member along the long hole, increasing the biting margin on the pipe. And surely prevent the tube from coming out.

[0012]

【Example】

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

FIG. 1 is an upper half cross-sectional view showing a state in which a buried pipe joint 10 according to an embodiment of the present invention is temporarily assembled as a set, and the buried pipe 2 is about to be inserted into the joint 10.

The joint 10 has a joint body 12 and a cap nut 18 as a fastening member combined with the joint body 12. The joint body 12 is provided with a central hole 13 for receiving the embedded pipe 2 therein and a male screw 15 on the outer periphery of the tip. Further, the inner circumferential portion of the tip has a diameter gradually increasing toward the tip, and is provided with a packing accommodating portion 14 for accommodating a packing 22 that seals between the pipe 2 and the joint body 12. The bag nut 18 is formed with an internal thread 19 that is screwed into the external thread 15 of the main body 12 on the inner circumference of the distal end side, and has an inclined inner diameter that gradually increases toward the external thread 15 portion. A peripheral wall 20 is formed. An annular groove for accommodating the cup seal 24 that seals between the cap nut 18 and the pipe 2 is formed on the inner periphery of the rear end portion.

26 is a washer for compressing the packing 22, and 28 is an O-ring.

Reference numeral 30 denotes a lock ring that holds a plurality of balls 36 as a batting member, the details of which are shown in FIGS. 4 and 5.

As shown in FIGS. 4 and 5, the lock ring 30 in this embodiment has an annular portion 31 and one end of the annular portion 31, which is continuous with each other and is separated from each other by a notch 32. It is composed of a plurality of bent portions 33 that are bent outward to form a substantially V shape. The annular portion 31 is provided with a plurality of through holes 34 extending in the axial direction and circumferentially spaced from each other. The through slots 34 and the bent portions 33 are arranged so as to correspond to each other in the circumferential direction of the ring. A ball 4 having a diameter larger than the width dimension of the through-slot is fitted into each through-slot from the outside of the annular portion 31, and a part of the ball 4 is set to project inside the annular portion 31. There is. Even if the ball 36 is in the position shown by the chain double-dashed line in FIG. 5, the diameter of the ball 36 is the width of the long hole 34 so that the ball 36 is prevented from being disengaged from the long hole 34 by each bent portion 33. The shape of the bent portion 33 is defined. Therefore, the ball 36 can move along the elongated hole 34, but does not come off from the lock ring 30. The lock ring 30 in this embodiment has a split 35 in a part of the annular portion 31.

When the embedded pipe 2 is inserted into the joint 10 from the state shown in FIG. 1 by a predetermined size, the ball 36 is pushed leftward in FIG. 1 along the elongated hole 34 and is placed on the outer periphery of the pipe 2. Then, when the cap nut 18 is tightened, the inclined inner peripheral wall 20 of the nut 18 presses each bent portion 33 of the lock ring 30, so that the ball 36 is firmly pressed onto the outer periphery of the pipe 2 and the pipe 2 and the joint 10 are connected. And will be fixed. This state is shown in FIG. In this state, the ball 36 comes into contact with the tip 35 of the elongated hole 34 and does not advance any further.

When the pipe 2 is buried in this state, a force for pulling out the pipe 2 from the joint 10 is applied, and when this force is larger than the fixing force due to the bite of the ball 36 in FIG. Move to the left as shown in 3. At this time, the ball 36 also rolls along the elongated hole 34 from the position shown by the chain double-dashed line in FIG. 3 to the position shown by the solid line. Along with this, the ball 36 is moved further inward in the radial direction by the bent portion 33 of the lock ring 30 that is in close contact with the inclined peripheral inner wall 20 of the nut 18, and the biting margin to the pipe 2 increases and the ball 36 is fixed. The force is increased to prevent the tube 2 from coming out.

[0020]

[Effect of the device]

 As described above, in the buried pipe joint according to the present invention, the hole of the lock ring that holds the batting member is an elongated hole that is long in the axial direction. The attachment member is also moved inward in the radial direction at the same time as it is moved in the axial direction, increasing the biting margin to the pipe 2 and preventing the pipe from coming out. Therefore, a sufficiently large and stable fixing force can be obtained without forming an outer peripheral groove for receiving the inner portion of the eating member and increasing the fixing force in the embedded pipe. Therefore, it is not necessary to form the outer peripheral groove in the buried pipe, and it is not necessary to confirm the fitting of the biting member into the groove when the pipe is inserted, so that the work can be simplified and the cost can be reduced.

[0021]

[Brief description of drawings]

[0022]

FIG. 1 is a half sectional view showing a temporarily assembled state of a joint of the present invention.

[0023]

FIG. 2 is a half cross-sectional view showing a state in which a buried pipe is fastened to a joint.

[0024]

FIG. 3 is a half cross-sectional view showing a state when a pulling force acts on the buried pipe.

[0025]

FIG. 4 is a front view showing an assembled state of a lock ring and a ball.

[0026]

5 is a cross-sectional view taken along line 5-5 of FIG.

[0027]

[Explanation of symbols]

2 Buried pipe 10 Joint 12 Joint body 18 Cap nut 30 Lock ring 31 Annular portion 33 Bent portion 34 Long hole 36 Ball

Claims (1)

[Scope of utility model registration request] 1. A joint main body having a hole into which a pipe to be connected is inserted, a screwing portion screwed into an end portion of the joint main body, and an inclination gradually increasing in diameter toward the screwing portion. A fastening member having an inner peripheral wall, a lock ring in contact with the inner peripheral wall, and a batting member that cooperates with the lock ring, and the batting member is formed by screwing the fastening member into the joint body. In a buried pipe joint in which a pipe and a joint are connected to each other by engaging the outer periphery of the pipe via a lock ring, the lock ring is circumferentially separated and has a plurality of through-holes extending in the axial direction. An annular portion provided and a plurality of bent portions that are bent in a radial direction from one end of the annular portion at a position corresponding to the position of the through hole in the circumferential direction. And the biting member has a penetration length of each of the annular portions. A part of the biting member projects into the inside of the annular portion from the hole, and is sandwiched between the annular portion and each of the bent portions in a state of being movable along the penetrating elongated hole, and the joint body. When the fastening member is screwed in, the inclined inner peripheral wall of the fastening member abuts on the bent portion of the lock ring to gradually reduce the diameter of the lock ring, and the eating member is inserted through the bent portion. A buried pipe joint characterized by being pressed against the outer circumference of the pipe to cause it to stick.