JPH09280447A - Oscillating expansion universal pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of preventing a slide pipe from coming off by reinforcing a stopper of the slide pipe, capable of suitably arranging the slide pipe in attaching, and capable of being smoothly extended and contracted. SOLUTION: A pipe joint is composed of joint main bodies 1, 2, a joint members 3, 4 in which holding pipes 31, 41 are connected to projecting spherical parts 30, 40 to be fitted to the recessed peripheral surfaces of the joint main bodies and to be slide on the spherical surfaces, and a slide pipe fitted in the holding pipes 31, 41 in which projecting annular bodies capable of being brought in contact with stoppers 33, 43 projectingly provided on the inner peripheries of the holding pipes are projectingly provided. In the projecting annular bodies, stopper parts 521 on the inner end of cover rings 52 are locked on the inner end surfaces of lock rings 51 fitted to the recessed grooves near both ends of the slide pipe 5, the outer ends 523 outside from slits 522 are bent and locked on the outer end surfaces of the lock rings 51, and the slide pipe 5 is positioned by interposing an annular spacer ring 7 between projecting bands 55 projectingly provided on the slide pipe 5 and the end surfaces of the holding pipes 31, 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swingable expandable joint which is used in connection with a pipe body such as a water pipe in response to an earthquake or subsidence.

[0002]

2. Description of the Related Art Conventionally, as a pipe joint for connecting pipes to each other so that they can swing and expand and contract, those shown in Japanese Utility Model Publication No. 63-44633 are widely used. The structure is such that a pair of joint bodies, each having a concave spherical surface portion formed on the inner peripheral surface thereof, are connected to ends of a pair of pipe bodies such as a pair of water pipes arranged axially apart from each other, and a pair of joints in which a holding pipe is continuously provided. The convex spherical surface of the member is water-tightly fitted to the concave spherical surface of the joint body, and the slide tube is slidably water-tightly fitted into the holding tube. However,
Since the lock ring of the slide tube that locks with the stopper protruding on the inner circumference of the holding tube is weak, it may be disengaged if shocking and repeated vibrations are applied in an earthquake, and the slide tube can be easily removed. It can be assumed.

Further, since the arrangement of the slide tubes in the joint member is not constant at the time of mounting, particularly, as shown in FIG. 10, the lock ring comes close to or comes into contact with the stopper of the holding tube of one joint member. In this case, the slide pipe can be moved to one side, but the movement to the other side requires a force equal to or more than the constrained earth pressure and cannot be displaced smoothly.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the lock ring of the slide tube which is engaged with the stopper projecting on the inner periphery of the holding tube is reinforced to prevent the lock ring from coming off and being damaged, and the slide tube coming off and coming off. The purpose is to provide something that can prevent. Further, the present invention provides a pipe joint in which the slide pipe can be arranged at an optimum position at the time of mounting so that the slide pipe can be smoothly expanded and contracted, and intrusion of earth and sand from the sliding surface can be prevented.

[0005]

For this reason, the present invention provides a pair of joint bodies which are connected to the ends of a pair of pipes axially separated from each other and which have a concave spherical surface formed on the inner peripheral surface thereof. A pair of joint members in which a holding tube is continuously provided on a convex spherical surface part that is fitted into the concave spherical surface part of the joint body and slides in a spherical surface, and a waterproof fitting is slidably fitted into the holding tube, and both ends are slidably fitted together. A slide ring having a protruding ring body projecting on the outer periphery that can come into contact with a stopper projecting on the inner periphery of the holding pipe near the above-mentioned portion, and a lock ring fitted in concave groove portions near both ends of the slide pipe. , A swingable expandable joint having a structure in which a cover ring fitted to a slide pipe is engaged and locked to form a protruding ring body. A cover ring is provided with a stopper portion protruding from the inner end of the inner circumference, and the stopper portion is locked to the protruding inner end surface of the lock ring, and the outer end of the cover ring is attached to the protruding outer end surface of the lock ring. The protruding portion may be formed by pushing and locking the portion. In addition, a stopper ring is provided on the inner end of the inner circumference, and a slit is used as a cover ring that is intermittently provided in the circumferential direction to lock the stopper on the protruding inner end surface of the lock ring. It is also possible to form a projecting ring body by pushing and locking the outside outer end portion from the slit to the protruding outer end surface by bending and locking. Further, an elastic spacer may be interposed between the pair of projecting strips projectingly provided in the central portion of the slide tube and the end surface of the holding tube of the joint member opposed thereto to position the slide tube.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. In the embodiment shown in FIGS. 1 and 2,
Reference numerals 1 and 2 denote joint main bodies that are connected to the tubular body, and have a concave spherical surface portion formed on the inner peripheral surface. Numerals 3 and 4 are joint members, which are convex spherical portions 3 which are fitted into the concave spherical portions and slide on the spherical surface.
Holding tubes 31 and 41 are connected to 0 and 40, respectively. The joint bodies 1 and 2 and the convex spherical surface portions 30 and 40 are the gasket 1
The water is still connected at 0 and 20.

Reference numeral 5 denotes a slide tube, which is inserted into the holding tubes 31 and 41 of the joint members 3 and 4 so that the ends thereof face the convex spherical surfaces 30 and 40. Holding tubes 31, 41
A pair of stoppers 33, 43, 34, 44 for sandwiching the gaskets 32, 42 are provided inwardly projecting inwardly on the inner periphery of the end of each of the slide tubes, and a projecting ring body 50 for locking the inner stoppers 33, 43 is slidable. Projected outward near the outer peripheral edge of 5,
A pair of protrusions 55 that engage with the outer stoppers 34 and 44 are provided at the center so as to protrude outward. 6 is a joint member 3,
It is a cover body that prevents the intrusion of earth and sand through the gap between 4 and the joint bodies 1 and 2. These configurations are the same as the conventional one.

A characteristic structure is a projecting ring body 50, and a lock ring 51 having a separating end, and as shown in FIGS. 3 and 4,
A stopper portion 521, which is a thick band, is provided at the inner end of the inner circumference so as to project, and a slit 522 is formed by a projection of the cover ring 52 which is intermittently provided in the circumferential direction.

Then, the lock ring 51 is fitted into the concave groove band of the slide tube 5, and the stopper portion 521 of the cover ring 52 previously inserted into the slide tube 5 is engaged with the inner end surface of the lock ring 51 as shown in FIG. After being stopped, as shown in FIGS. 6 and 7, the outer end portion 523 of the thin cover ring 52 is pushed and bent to engage with the outer end surface of the lock ring 51 to form the protruding ring body 50. As a result, the lock ring 51
The cover ring 52 is attached to and reinforced.

Further, as shown in FIG. 2, a spacer ring 7 made of rubber is inserted into the slide tube 5 and fitted into the ends of the holding tubes 31, 41 of the joint members 3, 4, and the spacer ring 7 is inserted.
The inner end of the slide tube 5 is brought into contact with the protrusion 55 to position the slide tube 5.

Further, all the sliding surfaces, that is, the spherical sliding surface and the sliding surface of the slide tube are coated with a fluororesin paint having a small friction coefficient so as to be rotationally expanded and contracted with a small force. Further, by covering the heads of the push bolts 8 of the joint members 3 and 4 screwed to the joint bodies 1 and 2 with the cover 9, the push bolts 8 can be protected from corrosion.

Due to this structure, the lock ring 5
Since the cover ring 52 is adhered to and reinforced with the cover 1, it is not easily damaged or detached even if an impact force is repeatedly applied by an earthquake or the like. Particularly, since the slits 522 are intermittently provided in the circumferential direction, the outer end 523 can be easily pushed and bent, and the cover ring 52 can be easily attached.

Further, by interposing the spacer ring 7, the slide tube 5 can be positioned and arranged at an optimum position. That is, by forming the spacer ring 7 having a length slightly shorter than the distance between the projecting ring body 50 and the stopper portions 33, 43, the respective projecting strips 5 can be formed.
The length between 5 and the stopper portions 34 and 44 is set to be slightly shorter than the distance between the projecting ring 50 and the stopper portions 33 and 43. For this reason, since the projecting band 55 and the projecting ring member 50 can be arranged at positions away from the stopper portions 33 and 43, the slide tube 5 can be smoothly expanded and contracted in the axial direction. At this time, since the spacer ring 7 is highly elastic, it easily contracts.

If the spacer ring 7 is not used, the slide tube 5 can be freely arranged, and the stopper portions 33 and 43 and the protrusion 5 can be arranged.
5 and the projecting ring 50 are located close to each other,
Since the joint members 3 and 4 forcibly pull the slide tube 5, a force greater than the earth pressure load is required, and therefore smooth expansion and contraction cannot be expected.

The present invention is not limited to this. For example, regardless of the structure of the pair of joint bodies having the concave spherical surface formed on the inner peripheral surface, a pair of holding tubes are continuously provided on the convex spherical surface that is fitted into the concave spherical surface with water and slides on the spherical surface. The structure of the joint member is also not limited.

Further, the projecting ring body projecting from the slide tube, which can come into contact with the stopper on the inner circumference of the holding tube, is a cover in which a lock ring fitted in the concave groove portions near both ends of the slide tube is fitted in the slide tube. Any structure may be used as long as it is attached and locked by a ring. Therefore, as shown in FIG. 8, after locking the lock ring, the outer end of the cover ring may be bent,
As shown in FIG. 9, in a state where the cover ring is locked to the inner end surface of the lock ring, a retaining ring 58 for locking the outer end surface of the cover ring to the outer end surface of the lock ring is fitted and welded to the cover ring. Good.

Further, when an elastic spacer ring is interposed between a pair of protrusions projecting from the central portion of the slide tube and the end surface of the holding tube of the joint member facing the slide belt, the material and shape of the elastic spacer ring are used. Is appropriate, but it should not prevent the movement of the slide tube, as long as the slide tube can be positioned and arranged at the time of attachment.

[0018]

According to claim 1 of the present invention, since the locking ring is covered with the cover ring and reinforced, the projecting ring body is easily damaged or detached even when the impact force due to an earthquake or the like is repeatedly applied. Therefore, it is possible to prevent the slide tube from slipping out. Further, in claim 2, the cover ring can be easily attached, and in claim 3, the outer end portion of the cover ring can be pushed and bent more easily by the interposition of the slit. Further, according to claim 4, the interposition of the spacer ring allows the slide tube to be positioned and arranged at an optimum position, so that the slide tube can smoothly expand and contract in the axial direction.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an exemplary embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a main part thereof.

FIG. 3 is a front view in which a part of the cover ring is cut vertically.

FIG. 4 is a vertical sectional side view of a cover ring.

FIG. 5 is a vertical cross-sectional side view of a main part showing attachment.

FIG. 6 is a front view in which a protruding ring body attached to a slide tube is partially longitudinally cut.

FIG. 7 is a vertical sectional side view of a projecting ring body attached to a slide tube.

FIG. 8 is a vertical sectional side view of a main part of another example of a projecting ring.

FIG. 9 is a vertical sectional side view of a main part of still another example of the projecting ring body.

FIG. 10 is a schematic vertical sectional side view showing an arrangement state of a conventional slide tube.

[Explanation of symbols]

 1, 2 Joint body 3, 4 Joint member 30, 40 Convex spherical surface portion 31, 41 Holding tube 33, 43, 34, 44 Stopper 5 Slide tube 50 Projection ring body 51 Lock ring 52 Cover ring 521 Stopper section 522 Slit 523 Outside Edge 55 Projection 7 Spacer ring 8 Push bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruken Matsui 1-1, Hachiman-cho, Takahama-shi, Aichi Limited

Claims (4)

[Claims] 1. A pair of joint bodies 1 and 2 which are connected to the end portions of a pair of pipes arranged apart from each other in the axial direction and have a concave spherical surface portion on the inner peripheral surface thereof, and a concave spherical portion of the joint main body. The holding tube 3 is attached to the convex spherical surface portions 30 and 40 that are fitted with the water stop and slide on the spherical surface.
A pair of joint members 3 and 4 in which 1 and 41 are provided in series, and a stopper 33 which is slidably water-tightly fitted into the holding pipes 31 and 41 and which is provided near the both ends to project on the inner circumference of the holding pipe. 43, which comprises a slide pipe having a protruding ring body that can abut against the outer periphery of the slide pipe, the lock ring 51 being fitted in the concave groove portions near both ends of the slide pipe 5, and the cover ring 52 being fitted in the slide pipe. The swingable expandable joint is characterized in that the projecting ring body 50 is formed by being attached and locked by. 2. A cover ring 52 having a stopper portion 521 projecting from an inner end portion of an inner circumference thereof, the stopper portion 521 being locked to a projecting inner end surface of the lock ring 51, and the lock ring 51 projecting. The swingable universal joint according to claim 1, wherein an outer end portion 523 of the cover ring 52 is pressed, bent, and locked to the outer end surface to form the protruding ring body 50. 3. A cover ring 52 is provided with a stopper portion 521 projecting from the inner end portion of the inner circumference, and slits 522 are intermittently provided in the circumferential direction, and the stopper portion 521 is formed on the projecting inner end surface of the lock ring 51. Along with locking
The slit 5 is formed on the protruding outer end surface of the lock ring 51.
The swingable universal joint according to claim 1, wherein the outer ring end portion 523 is pushed and locked from 22 to form a projecting ring body 50. 4. An elastic spacer ring 7 is interposed between a pair of projecting strips 55 projectingly provided in the central portion of the slide tube 5 and the end faces of the holding tubes 31, 41 of the joint members 3, 4 opposed thereto to slide. The swingable universal joint according to claim 1, which positions the pipes 5.