JP4140873B2 - Tube fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a split case body fixing device used when a branch pipe or a valve body is attached to an existing fluid pipe such as a water pipe or a gas pipe.
[0002]
[Prior art]
For example, when connecting a branch pipe or installing a valve body to a fluid pipe such as a water pipe buried underground, a split case body is attached. A fixing device such as a special push ring provided with a fastening tool is used so that the positional displacement of the split case body does not occur.
[0003]
FIG. 6 shows a split case body A to which a conventional fixing device E is attached.
[0004]
In the figure, the split case body A attached to the fluid pipe P is integrated by tightening flange portions B formed at opposite ends of the split portion with bolts and nuts. Packing C is disposed on the outer peripheral surface of the part B and the end portion of the fluid pipe P to maintain water tightness.
[0005]
At both ends of the split case body A, a fixing device E composed of a main body F and a fastening tool G is mounted.
[0006]
The main body F is divided into two and provided with an engagement groove H that engages with an engagement projection D formed at the end of the split case body A, and the diameter of the inner surface increases toward the split case body A. An inner taper surface I is formed.
[0007]
A flange portion J provided with a bolt insertion hole is formed on the opposite end face of the split portion of the main body F, and a fastener is disposed inside the bolt insertion hole by inserting a bolt into the bolt insertion hole and tightening the nut. It is integrated while pressing G against the outer peripheral surface of the fluid pipe P.
[0008]
The fastener G is divided into two parts, an outer tapered surface K that is in close contact with the inner tapered surface I is formed on the outer peripheral surface, and a blade L that bites into the outer peripheral surface of the fluid pipe P is formed on the inner peripheral surface.
[0009]
In the fixing device E, the fastening tool G has the outer tapered surface K abutting against the inner tapered surface I of the main body F and the blade is biting into the outer peripheral surface of the fluid pipe P. When moving in the direction of exiting, force is exerted in the direction in which the blade L of the fastener G further bites into the outer periphery of the fluid pipe P by the tapered surfaces I and K, thereby preventing movement.
[0010]
[Problems to be solved by the invention]
In the conventional fixing device described above, the main body F is divided in order to attach to the existing fluid pipe P and to bite the blade of the fastener G into the outer peripheral surface of the fluid pipe P. The flange J is integrated by fastening with bolts and nuts, but it is integrated by the reaction when the fastener G bites into the fluid pipe P when the fluid pipe P and the split case body A try to move relative to each other. In some cases, the divided portion of the main body F is opened.
[0011]
In such a state, the fixing force of the fastener G to the fluid pipe P decreases, and it becomes impossible to maintain a predetermined holding force, and the split case body A and the fluid pipe P move relative to each other. Accidents such as a branch pipe coming out or water leakage occurred.
[0012]
The problem to be solved by the present invention is to solve the above-mentioned problem, and is to provide a fixing device that maintains a predetermined fixing holding force without opening the dividing portion.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the fixing device of the present invention is fitted to the outer peripheral surface of the fluid pipe so as to be able to come into contact with the side end surface of the split case body that is externally fitted to the fluid pipe. And a ring-shaped or circularly shaped fastener formed on a tapered surface that gradually increases in diameter toward the surface, and a fluid pipe on the side of the fastener that is externally fitted so as to be movable in the axial direction. The split case body includes a pressing portion formed on a tapered surface that can be brought into close contact with the outer peripheral surface of the fastener, and a split ring having a flange that can be fastened to the end portion of the split case body with a fastening means. The press part is fitted inside the collar part provided in the edge part of this.
With this feature, after the fastener is brought into contact with the side end surface of the split case body and fitted to the fluid pipe, the pressing portion is fitted inside the flange provided at the end of the split case body, When the flange of the index ring that is externally fitted to the fluid pipe is fastened to the split case body by the fastening means, the taper surface of the pressing portion of the index ring presses against the taper surface of the clamp, and the clamp is reduced. Press on.
As a result, the fastener is strongly pressed against the outer peripheral surface of the fluid pipe and is fixed to the split case body. When the fluid pipe is about to move, the diameter of the fastener is further reduced by the taper surface and the fixing force is increased. At this time, since the flange receives the reaction force from the fastening tool applied to the pressing part, the pressing part of the split wheel is opened, the pressing force of the fastening tool is reduced, and the fixing force is not reduced.
[0014]
It is preferable that the collar portion is provided in a cylindrical shape covering substantially the entire circumference of the fluid pipe. If it does in this way, since the intensity | strength of the collar part which prevents that the press part of a tamper wheel will open increases, it can prevent a press part from opening more reliably.
[0015]
It is preferable that the split wheel is attached at a position where the split part and the split part of the split case body are different.
If it does in this way, since the direction in which the press part of a split wheel opens and the direction in which the split case body in which the collar part which prevents an opening is provided open easily differ, it can prevent opening of a split ring efficiently.
[0016]
It is preferable that the flange of the split wheel is provided near the tip of the pressing portion.
If it does in this way, since most of the press parts of a split wheel can be fitted inside the collar part of a split case body, it can prevent reliably that a press part opens.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
1 to 3 show an embodiment in which a split case body 2 is mounted on an existing fluid pipe 3 made of polyethylene using the fixing device 1 of the present invention.
[0019]
The split case body 2 is made of ductile cast iron, and includes a semi-cylindrical T-shaped body 2a having an upper branch pipe portion 2c, and a lower semi-cylindrical cover body 2b fastened in a metal touch state thereto. In addition, a branch port is formed in the fluid pipe 3 through the branch pipe portion 2c by a known continuous water method, and the fluid in the fluid pipe 3 is branched.
[0020]
The watertightness between the split case body 2 and the outer peripheral surface of the fluid pipe 3 is maintained by the packings 4 disposed on the opposing end surfaces of the T-shaped body 2a and the cover body 2b and on the inner surfaces of both end portions.
[0021]
A half-cylindrical flange portion 5 is formed at both end portions of the T-shaped body 2a and the cover body 2b, and a flange 2d is continuously provided on the outer peripheral portion thereof.
[0022]
The fixing device 1 is provided on both sides of the split case body 2, and includes a split split wheel 6 having a pressing portion 6b facing the flange 6a and the split case body 2, the flange 6a and the flange 2d of the split case body 2. Are composed of a plurality of T-head bolts 7 and nuts 8, and a fastener 9 that is fitted on the outer peripheral surface of the fluid pipe 3 and is disposed inside the flange 5. The tapping wheel 6 is made of ductile cast iron.
[0023]
The outer peripheral surface of the pressing part 6b is a half cylinder, and the outer diameter is slightly smaller than the inner diameter of the flange part 5. Further, the inner peripheral surface of the pressing portion 6b is formed such that an inner tapered surface 6c that gradually increases in diameter toward the split case body 2 is in close contact with an outer tapered surface 9b of a fastener 9 described later.
[0024]
Both ends of the flange 6a are provided with bolt hole portions having opposite steps as shown in FIG. 4, and when the two split rings 6 are assembled, the step portions are engaged with each other. When the head bolt 7 is inserted, the split wheel 6 cannot be divided.
[0025]
As shown in FIG. 5, the fastening tool 9 includes a plurality of (six in the embodiment) arcuate fastening pieces 9 a made of a synthetic resin harder than the fluid pipe 3, for example, acetal resin. 10 is connected in a ring shape. Each tightening piece 9a has an outer tapered surface 9b whose outer peripheral surface is inclined in the same manner as the inner tapered surface 6c of the pressing portion 6b, and a plurality of blades 9c are formed on the inner peripheral surface.
[0026]
Each fastening piece 9a is detachable and expandable / contractible by the connector 10, and is pushed open to an inner diameter slightly larger than the outer diameter of the fluid pipe 3 in a natural state.
[0027]
In order to fix the split case body 2 to the existing fluid pipe 3 by using the fixing device 1 of the above embodiment, the T-shaped body 2a and the cover body 2b are attached to the fluid pipe 3 as shown in FIG. In this state, first, the two fasteners 9 are inserted inside the flange portion 5 of the split case body 2 with the large diameter side of the outer tapered surface 9b facing the split case body 2 side. The surface on the large diameter side of 9 is brought into contact with the vertical surface at the end of the split case body 2.
[0028]
When attaching the fastener 9, a part of the connector 10 is removed from the fastening piece 9 a so that it can be externally fitted to the fluid pipe 3, and then attached so as to be wound around the outer peripheral surface of the fluid pipe 3. The connecting tool 10 is attached to the fastening piece 9a again.
[0029]
After the fastening tool 9 is inserted into the flange part 5 of the split case body 2, the two-part split wheel 6 is attached to the outer peripheral surface of the fluid pipe 3, and the tip of the pressing part 6 b is connected to the outer peripheral surface of the fastening tool 9. It inserts between the inner peripheral surfaces of the collar part 5. The mating portion of the split wheel 6 is attached to the split case body 2 at a position where the mating portion of the T-shaped body 2a and the cover body 2b is shifted by about 45 degrees.
[0030]
Next, the flanges 2 d at both ends of the T-shaped body 2 a and the cover body 2 b and the flanges 6 a of the split wheel 6 are fastened with T-head bolts 7 and nuts 8. Then, the fastening tool 9 is radially reduced in diameter by the outer tapered surface 9b on the outer periphery being pressed by the inner tapered surface 6c on the inner surface of the pressing portion 6b.
[0031]
Thereby, the blade 9c of each fastening piece 9a bites into the outer peripheral surface of the fluid pipe 3 and is locked, and the split case body 2 has a pressing portion 6b in pressure contact with the fastening piece 9a, that is, the split wheel 6 and The fluid pipe 3 is firmly attached via a T-head bolt 7 and a nut 8 attached to the flange 6a.
[0032]
When the split case body 2 and the fluid pipe 3 are about to move relative to each other, the outer tapered surface 9b of the fastening piece 9a is further pressed by the inner tapered surface 6c of the pressing portion 6b, and the fastening tool 9 is reduced in diameter. The blade 9c of the tightening piece 9a further bites into the outer peripheral surface of the fluid pipe 3 and is locked.
[0033]
At this time, the reaction force when the diameter of the tightening tool 9 is reduced acts on the pressing portion 6b of the indexing wheel 6 with which the tightening tool 9 is in contact, and the mating part of the indexing ring 6 tries to open, Since the outer peripheral surface of the portion 6 contacts the inner peripheral surface of the flange portion 5 of the split case body 2 to prevent the split wheel 6 from opening, it is not necessary to provide a mechanism for preventing the split wheel 6 from opening.
[0034]
Since the split ring 6 is attached to the split case body 2 with the matching part of the split ring 6 being different from the match part of the T-shaped body 2a and the cover body 2b, the opening direction of the split ring 6 and the split case body 2 are aligned. The direction is different and there is no worry that the split case 2 will open.
[0035]
While the embodiments of the present invention have been described with reference to the drawings, the specific configuration of the present invention is not limited to this.
The fastening tool in the embodiment is a ring in which a plurality of fastening pieces are connected by a connecting tool. It may be a ring.
Moreover, although the split case body and the split wheel are divided into two, they may be divided into three.
[0036]
【The invention's effect】
According to the present invention, after the fastener is brought into contact with the side end surface of the split case body and fitted into the fluid pipe, the pressing portion is fitted inside the flange portion provided at the end of the split case body. When the flange of the index ring that is externally fitted to the fluid pipe is tightened to the split case body by the fastening means, the taper surface of the pressing portion of the index ring presses against the taper surface of the fastener, and the fastener is compressed. Press in the radial direction.
As a result, the fastener is strongly pressed against the outer peripheral surface of the fluid pipe and is fixed to the split case body. When the fluid pipe is about to move, the diameter of the fastener is further reduced by the taper surface and the fixing force is increased. At this time, since the flange receives the reaction force from the fastening tool applied to the pressing part, the pressing part of the split wheel is opened, the pressing force of the fastening tool is reduced, and the fixing force is not reduced.
[0037]
According to invention of Claim 2, since the intensity | strength of the collar part which prevents that the press part of a split wheel is opened, the opening of a press part can be prevented more reliably.
[0038]
According to the invention of claim 3, since the direction in which the pressing portion of the split wheel is opened differs from the direction in which the split case body provided with the flange portion for preventing the opening is easy to open, it is possible to efficiently prevent the split wheel from being opened. it can.
[0039]
According to the invention of claim 4, since most of the pressing portion of the split wheel can be fitted inside the collar portion of the split case body, it is possible to reliably prevent the pressing portion from opening.
[0040]
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is also a partially cutaway plan view.
FIG. 3 is a side view of the same.
4A is a front view and FIG. 4B is a side view of the split wheel.
5A is a front view of the fastener, and FIG. 5B is a cross-sectional view taken along the line II.
6A is a partially cutaway front view showing a conventional example, and FIG. 6B is a plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixing device 2 Split case body 2a T-shaped body 2b Cover body 2c Branch pipe part 2d Flange 3 Fluid pipe 4 Packing 5 Collar part 6 Split ring 6a Flange 6b Press part 6c Inner taper surface 7 T head bolt 8 Nut 9 Fastening tool 9a Tightening piece 9b Outer taper surface 9c Blade 10 Connector

Claims (4)

A ring formed on a tapered surface that is fitted to the outer peripheral surface of the fluid pipe so as to be able to come into contact with a side end surface of the split case body that is externally fitted to the fluid pipe, and whose outer peripheral surface gradually expands toward the split case body; A notch-shaped fastening tool and a fluid pipe on the side of the fastening tool are externally fitted so as to be movable in the tube axis direction, and the inner peripheral surface is formed into a tapered surface that can be in close contact with the outer peripheral surface of the fastening tool. And a split ring having a flange that can be fastened to the end portion of the split case body with a fastening means, and the press portion is inside the flange provided at the end portion of the split case body. A pipe fixing device characterized by being fitted. The pipe fixing device according to claim 1, wherein the flange portion is provided in a cylindrical shape covering substantially the entire circumference of the fluid pipe. The pipe fixing device according to claim 1 or 2, wherein the split wheel is attached at a position where the split portion and the split portion of the split case body are different. The pipe fixing device according to claim 1, wherein the flange of the tweezer wheel is provided near the tip of the pressing portion.

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