JP2001295969A - Detachment preventing device for fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten rust preventing effect by providing a sealing member integrally with a cutting edge part so as to be brought into pressure contact without clearance around a bite part of a fluid pipe. SOLUTION: This detachment preventing device for the fluid pipe is provided with a push ring body fitted to the outer periphery of the other fluid pipe connected being inserted in a socket part at the end of one fluid pipe, and having a plurality of arcuate recessed parts opened in a circumferential direction, at the inner peripheral surface; arcuate claws accommodated in the arcuate recessed parts and having cutting edge parts at the tip parts on the inner peripheral side so as to be bitable into the outer peripheral surface of the fluid pipe; and a push bolt screw-inserted in the push ring body, pointing into a centripetal direction, and pressing the outer peripheral end of the arcuate claw to make the cutting edge part bite into the outer peripheral surface of the fluid pipe. The sealing member 15 is bonded or stuck to the tip part T of the cutting edge part 13a of the arcuate claw 13 so as to cover the surface, and the lower part of the tip part T of at least the cutting edge part 18a of the sealing member 15 is divided in the longitudinal direction of the cutting edge part 13a by a cut line C extending in a longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation preventing device which is attached to a joint between fluid pipes such as water pipes and gas pipes to prevent the separation of fluid pipes.

[0002]

2. Description of the Related Art A conventional detachment prevention device attached to a joint between fluid pipes is disclosed in, for example, JP-A-9-1957.
There is a so-called special pressing wheel as disclosed in Japanese Patent No.

As shown in FIG. 9, this conventional detachment prevention device includes a fluid pipe 1 made of ductile cast iron or the like and a fluid pipe 1 having an annular press ring main body 3 fitted in one receiving portion 1a. 2
Is pushed into the outer peripheral surface of the fluid pipe 2 by pressing a bow-shaped claw 4 housed in a concave portion of the inner surface of the pressing ring body 3 with a push bolt 5, and the flange portion of the receiving portion 1a. 1b and the pressing ring body 3 are fastened with bolts 6 and nuts 7, and the packing 8 is pushed into the receiving portion 1a to prevent the fluid pipes 1 and 2 from being separated from each other and to maintain watertightness. Is to connect.

In such a separation prevention device, a rust-preventive film applied or coated on the outer peripheral surface of the fluid pipe 2 is formed by the arcuate claw 4.
O-rings 9 are provided at the end of the inner peripheral surface of the pressing ring body 3 on the side opposite to the packing 8 so as to prevent the exposed metal part from corroding due to the penetration of groundwater. Intrusion into the accommodating portion of the nail 4 is prevented.

FIG. 10 shows another embodiment of the rust prevention structure in the above-mentioned conventional detachment prevention device. O-rings 9 and 9 are provided on both sides of the claw 10 sandwiching the blade portion 10a. It is pressed into contact to prevent water or the like from entering the biting portion of the fluid pipe 2.

[0006]

In the above-described conventional rust-preventive structure using the O-ring 9, the O-ring 9 is provided separately from the blades of the claws 4 and 10 and the blade is formed separately. Since the part comes into contact with the outer surface of the fluid pipe after biting into the fluid pipe, when excavating a wet ground such as a soft ground and replacing the existing fluid pipe, the claw is attached to the fluid pipe etc. Before biting, ie O
Before the ring is strongly pressed against the outer peripheral surface of the fluid pipe, moisture or the like in the soil may enter the vicinity of the blade of the claw.

[0007] As a result, it is expected that water or the like that has entered the vicinity of the blade portion will enter the exposed portion (bite portion) of the fluid pipe simultaneously with the bite of the blade edge, and the rust prevention effect will be impaired.

The present invention has been made in order to solve the above-mentioned problems. By providing a sealing member integrally with a blade portion, the sealing member is brought into close contact with a portion near the biting portion of the fluid pipe without any gap, thereby enhancing the rust prevention effect. It is an object of the present invention to provide a device for preventing a fluid pipe from being detached.

[0009]

In order to achieve the above object, a detachment prevention device according to the present invention comprises an outer peripheral surface of another fluid pipe which is inserted and connected to a receptacle at one end of one fluid pipe. A press ring main body having a plurality of arcuate concave portions facing the circumferential direction on an inner peripheral surface thereof, and a blade housed in the arcuate concave portions and capable of cutting into the outer peripheral surface of the fluid pipe at a tip end on the inner peripheral side. An arcuate claw having a portion, is screwed into the pressing ring body in a centripetal direction,
By pressing the outer peripheral end of the arcuate claw, a push-bolt for cutting the blade portion into the outer peripheral surface of the fluid pipe is provided.
An elastic seal member is adhered or fixed so as to cover the surface thereof, and at least a lower portion of a tip portion of the blade portion of the elastic seal member is divided in a longitudinal direction by a cut extending in the longitudinal direction of the blade portion. It is characterized by: According to the present invention having the above-described structure, as the push bolt is gradually screwed in and the arc-shaped pawl is pushed by the fluid pipe, the cutting edge protrudes from the cut of the elastic seal member adhered or fixed to both sides thereof, and the fluid pipe is cut off. It is cut into the outer peripheral surface. At this time, since the elastic member is strongly pressed into the vicinity of the distal end portion of the blade portion and the biting portion of the fluid pipe, water and the like do not enter the biting portion of the fluid pipe, and the rust prevention effect of that portion is enhanced. .

In the detachment prevention device, it is preferable that a recess opening downward is formed on a lower surface of the elastic seal member so as to cover a lower end of the cut. By doing so, at least the vicinity of the cut in the seal member becomes thin, and the seal member is easily divided in the front-rear direction of the blade portion when the blade portion bites into the fluid pipe, so that the push bolt is easily screwed. become.

[0011] In the detachment prevention device, a portion of the elastic seal member that covers the tip of the blade portion is widened.
It is preferable that the cross-sectional area of the portion is larger than the other portions. In this case, the contact area between the cut seal member and the fluid pipe increases, so that the rust prevention effect is further enhanced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same members as those in the above-described conventional example are denoted by the same reference numerals and described.

FIG. 1 shows a part of a detachment preventing device according to the present invention, that is, a part of a press ring main body 3 which forms an annular shape of a special press ring. As in the conventional case, an outer peripheral surface of an end of one fluid pipe (not shown) is shown. And is connected to the other fluid pipe.

On the inner surface of the pressing wheel body 3, a plurality of partitioning pieces 3a facing the centripetal direction are protruded at equal intervals in the circumferential direction. Dimensional locking pieces 3b are continuously provided.

[0015] Between adjacent partition pieces 3a, 3a,
An inwardly concave U-shaped arc-shaped concave portion 11 for accommodating a bow 13 to be described later is formed. On the peripheral wall of the pressing wheel body 3, a push bolt 5 that is oriented in a centripetal direction that can advance and retreat toward the center of each recess 11 is screwed.

A bolt insertion hole 12 for connecting the pressing ring body 3 to a flange portion (not shown) of the other fluid pipe is formed in a peripheral wall of a portion corresponding to each partition piece 3a.

An arcuate claw 13 as shown in FIGS. 2 to 4 is detachably accommodated in each of the recesses 11. The arcuate claw 13 has a knife-edge-shaped blade portion 13a on an inner peripheral portion thereof, and is formed by projecting locking projections 14 at both upper ends in the circumferential direction.
The distance between the end portions 4 is slightly larger than the distance between the locking pieces 3b, 3b projecting inward into the recess 11 of the pressing ring body 3.

A rubber seal member 15 is attached to the bow 13 so that the elastic cylindrical portions 15a, 1
5a is fitted by being fitted to both locking projections 14 of the arcuate claw 13, and the surfaces 13b and 13c of the blade portion 13a and both end surfaces in the circumferential direction are covered.

More specifically, as shown in FIG. 4, below the distal end portion T of the blade portion 13a of the elastic seal member 15, a cut C extending in the vertical direction extends continuously in the longitudinal direction of the elastic seal member 15. The lower part of the seal member 15 is divided in the front-rear direction of the distal end portion T through the cut C. The portions of the seal member 15 covering the surfaces 13b and 13c of the blade portion 13a are firmly adhered to the surfaces 13b and 13c with an adhesive.
In this case, the tip T on the surfaces 13b and 13c is used.
It is preferable that only the vicinity is not adhered but left as a non-adhered portion.

To accommodate the bow 13 in the recess 11 of the pressing ring body 3, one end of the bow 13 is first inserted into the recess 11, and then the other end is inserted into the sealing member 1 as shown in FIG.
5 can be easily accommodated by inserting it while compressing the elastic cylindrical portions 15a at both ends.

After being housed, the elastic cylindrical portion 15a fitted to the locking projection 14 is locked by the locking piece 3b of the pressing ring body 3, so that there is no possibility that the elastic cylindrical portion 15a will come off easily.

As shown in FIG. 6, when the pressing ring body 3 having the arcuate claws 13 housed in all the recesses 11 is fitted over the fluid pipe 2 and the push bolt 5 is screwed, the arcuate claws 13 are pressed in the centripetal direction. The lower end of the seal member 15 is pressed against the outer peripheral surface of the fluid pipe 2.

When the push bolt 5 is further screwed in this state, as shown in FIG. 7, the tip T of the blade portion 13a protrudes from the cut C and bites into the outer peripheral surface of the fluid pipe 2, so that the push ring main body 3 is connected to the fluid pipe. 2 will be fixed.

As described above, the sealing member 15 is
Since it is firmly adhered to the surfaces 13b and 13c of a,
Only the tip portion T of the blade portion 13a peels off from the surface,
The other part is compressed between the fluid pipe 2 and the blade part 13a together with the blade part 13a and presses against the surface thereof without any gap, so that water in the buried soil enters the bite part of the fluid pipe 2. I will not do it. Also, the surface 13b of the blade portion 13a, 1
Even if 3c is covered by the seal member 15 without gaps,
As the blade portion 13 a is pushed by the fluid pipe 2, the distal end portion T surely bites into the outer peripheral surface of the fluid pipe 2 through the cut C, so that the pressing ring body 3 is fixed to the fluid pipe 2. become. As described above, if the vicinity of the distal end portion T of the blade portion 13a in the seal member 15 is set as a non-adhesive portion,
The tip portion T is deeply penetrated into the fluid pipe 2 by the sealing member 15.
As a result, the rust-proofing effect is enhanced, and the corrosion of the cut-in portion is prevented.

FIG. 8 shows a modification of the seal member 15. A lower portion of the blade portion 13a of the seal member 15 below the distal end portion T is wider than that of the above-described embodiment and extends downward.
A concave portion 16 divided forward and backward by the cut C is formed over the longitudinal direction of the seal member 15. By doing so, the tip portion T of the blade portion 13a is securely covered with the seal member 15, so that water does not easily enter the tip portion T before being pressed by the fluid pipe 2, and the seal member 1
Since the contact area between the fluid pipe 5 and the fluid pipe 2 is also increased, the rust prevention effect can be further enhanced. In addition, even if the seal member 15 is widened in this way, at least the vicinity of the cut C becomes thin, and the seal member 2 is easily divided in the front-rear direction of the blade portion when the blade portion 13a bites into the fluid pipe 2. Therefore, the push bolt 5 can be easily screwed.

The shape of the concave portion 16 is arbitrary and can be variously deformed. Even if the concave portion 16 is not formed continuously in the longitudinal direction of the lower surface portion 15b as described above, the lower surface portion 15b May be formed at appropriate places.

The present invention is not limited to the above embodiment, but can take various embodiments. For example, in the above embodiment, the seal member 15 is fixed to the blade portion 13a with an adhesive, but may be integrally fixed by molding (vulcanization) molding or baking.

When the entire seal member 15 is fixed to the bow 13, the present invention can be applied to a bow without the locking projection 14. In this case, an elastic member projecting in the same direction as the elastic cylindrical portion 15a (not necessarily a cylindrical shape) may be provided continuously. Also,
The seal member 15 may be divided into a portion fixed to the blade portion 13a and a portion fitted to the locking projection 14.

If the shape of the locking projection 14 is a thin projection disclosed in Japanese Patent Application Laid-Open No. 6-241360 by the applicant of the present invention and the structure is such that it can be prevented from falling off from the recess 11, the sealing member 15 can be formed. The elastic cylinder 15a is omitted, and the blade 1
Only the bonding portion 3a may be used.

[0030]

According to the present invention, the following effects can be obtained.

(A) According to the first aspect of the present invention, as the push bolt is gradually screwed in and the arcuate claw is pushed by the fluid pipe, the cutting edge is adhered or fixed to both sides of the elastic seal. It protrudes from the cut of the member and bites into the outer peripheral surface of the fluid pipe. At this time, since the elastic member is strongly pressed into the vicinity of the distal end portion of the blade portion and the biting portion of the fluid pipe, water and the like do not enter the biting portion of the fluid pipe, and the rust prevention effect of that portion is enhanced. .

(B) According to the second aspect of the invention, at least the vicinity of the cut in the seal member becomes thin,
Since the seal member is easily divided in the front-rear direction of the blade portion when the blade portion bites into the fluid pipe, the push bolt is easily screwed.

(C) According to the third aspect of the invention, the contact area between the cut seal member and the fluid pipe is increased, so that the rust prevention effect is further enhanced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a pressing wheel main body according to the present invention.

FIG. 2 is a front view of an arcuate claw and a seal member attached thereto.

FIG. 3 is a plan view of a bow.

FIG. 4 is an enlarged vertical sectional side view taken along line IV-IV of FIG. 2;

FIG. 5 is an enlarged longitudinal sectional partial front view showing a state in which an arcuate claw is accommodated in a concave portion of a pressing wheel main body.

FIG. 6 is an enlarged vertical cross-sectional front view of a state in which an arcuate claw is cut into a fluid pipe.

7 is a vertical sectional side view of the line VII-VII of FIG. 6;

FIG. 8 is a longitudinal sectional side view of an arcuate claw provided with a modified example of a seal member.

FIG. 9 is a vertical sectional side view showing a conventional detachment prevention device.

FIG. 10 is a vertical sectional side view of a main part showing another conventional example.

[Explanation of symbols]

 Reference numerals 1 and 2 Fluid pipe 3 Pressing ring body 3a Partition piece 3b Locking piece 5 Push bolt 11 Depression 12 Insertion hole 13 Bow claw 13a Blade portion 13b, 13c Surface 14 Locking protrusion 15 Seal member (elastic sealing member) 15a Elastic cylinder portion 15b Lower surface 16 Recess C Cut T End

Claims (3)

[Claims] 1. A plurality of arc-shaped recesses which are fitted on the outer peripheral surface of the other fluid pipe which is inserted into and connected to the receptacle at the end of one fluid pipe, and which are oriented in the circumferential direction on the inner peripheral face. A press ring main body, an arcuate claw housed in the arc-shaped concave portion and having a blade portion capable of cutting into an outer peripheral surface of a fluid pipe at an inner peripheral end portion, and screwed into the press ring main body in a centripetal direction, A push bolt for pressing the outer peripheral end of the arcuate claw to cause the blade portion to bite into the outer peripheral surface of the fluid tube. An elastic seal member is adhered or fixed so as to cover the lower end portion of the blade portion of the elastic seal member is divided in the longitudinal direction of the blade portion by a cut extending in the longitudinal direction. Characteristic device for preventing detachment of a fluid pipe. 2. The device according to claim 1, wherein a recess opening downward is formed on a lower surface of the elastic seal member so as to cover a lower end of the cut. 3. The fluid pipe detachment prevention device according to claim 1, wherein a portion of the elastic seal member covering a tip portion of the blade portion is wide, and a cross-sectional area of the portion is larger than other portions.