JP2000161577A - Saddle snap tap for resin tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a saddle snap tap for a resin tube preventing the lowering of sealing performance caused by creep deformation of the resin tube by surely installing a core and to execute the boring an the tapping simultaneously by a process by tapping while pressing the core into a snap tap hole. SOLUTION: A saddle snap tap 2 fixed to a soft resin main tube 1 and tapping a fluid passage is provided with a jaw part 12 in the internal circumference of the bottom hole of the snap tap body 7, a brim part 14 in the top of a cylindrical core 13 composed of a hard material such as metal, and a screw part 15 in its outer circumference; the cylindrical core 13 is fitted in the bottom hole of the snap tap body 7, the brim part 14 is engaged with the jaw part 12 so as to project the cylinder part 13a of the core downward, the outside diameter of the cylinder part 13a is set larger than that of the snap tap hole 6 bored in the resin main tube 1, the cylinder part 13a is tapped in the snap tap hole 6 in the press-in state, and the cylinder core 13 is fixed to the resin main tube 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saddle water tap for a resin pipe for providing a branch pipe in a resin main pipe in a state of uninterrupted water.

[0002]

2. Description of the Related Art Conventionally, when a saddle water tap is fixed to a water main pipe or a gas main pipe, and a branch pipe is connected to this water tap to branch off, a hole between the perforation hole of the main pipe and a saddle mounting surface is formed. A gasket is mounted between the water faucet and the perforated hole to ensure sealing.

If the main pipe is made of a metal such as a cast iron pipe or a steel pipe, the gasket maintains the sealing performance of the saddle mounting surface. However, if the main pipe is a resin pipe of polyethylene, polypropylene or the like, the saddle is not used. If used for a long time with bolts and nuts tightened, residual stress in the resin pipe may cause
The tube will creep and the gasket seal will deteriorate,
As a result, there is a possibility that a fluid such as water leaks from this portion.

Therefore, in order to solve these drawbacks, countermeasures described in Japanese Patent Application Laid-Open No. Hei 10-196871 have been proposed.

[0005]

However, Japanese Unexamined Patent Application Publication No. Hei 10-196871 employs a means for tapping a core into a perforation hole of a main pipe. Because it is independent, the core itself does not bite into the drilled hole of the resin tube, and the external thread of the core is tapped so that only the thread of the screw is locked to the inner diameter of the drilled hole. However, since it is mounted in an incomplete state, there is still a problem that a fluid leakage phenomenon occurs.

SUMMARY OF THE INVENTION The present invention has been developed to solve the conventional problems. The object of the present invention is to tap the core while press-fitting the core into the water diversion hole so that the core is securely mounted and the resin is removed. It is an object of the present invention to provide a saddle water faucet for a resin pipe which prevents a decrease in sealing performance due to creep deformation of the pipe and enables simultaneous piercing and tapping in one step.

[0007]

In order to achieve the above object, the present invention relates to a saddle water tap which is fixed to a soft resin main pipe and branches a fluid passage. A jaw is provided, a flange is provided on the upper part of a cylindrical core made of a hard material such as metal, and a screw part is provided on the outer periphery.The cylindrical core is fitted into the lower hole of the faucet main body, and the flange is engaged with the jaw. Let the cylindrical part of the core protrude downward, make the outer diameter of the cylindrical part larger than the water diversion hole drilled in the resin main pipe, and tap the cylindrical part into the water diversion hole in a press-fit state, This is a saddle water tap for a resin pipe in which a cylindrical core is fixed to a resin main pipe.

When drilling and tapping are performed in a single step, a cylindrical core is fitted around the perforation blade of the water diversion hole, and the rotation feed pitch of the perforation blade and the pitch of the outer peripheral thread of the cylindrical core are adjusted. Coincide with each other, mesh with the cylindrical core and the drilling blade in the drilling direction,
A transmission unit that does not mesh in the reverse direction is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a saddle water tap for a resin pipe according to the present invention will be described with reference to the drawings. FIG.
FIG. 3 to FIG. 3 are vertical cross-sectional views showing steps of simultaneously perforating the resin tube and mounting the cylindrical core.

In FIG. 1, reference numeral 1 denotes a main pipe made of a soft resin such as polyethylene resin or polypropylene resin, for example, a main pipe for supplying tap water or the like. A saddle tap 2 that branches off one fluid passage is fixed.

The water faucet 2 surrounds the outer peripheral surface of the resin main pipe 1 with a band and a saddle 3, and is fastened and fixed with bolts and nuts (not shown), and is attached to an inner peripheral surface of a mounting projection 4 formed on the saddle 3. An annular gasket 5 for hermetically sealing a water diversion hole 6 drilled in the resin main pipe 1 is attached. Further, a T-shaped water tap main body 7 external thread portion 7a is attached to a female thread portion 4a of the mounting projection 4. Are fixed to the saddle 3 by screwing.

A branch pipe 10 is connected to a branch portion 8 of the water faucet body 7 via a joint 9, and an upper end of the water faucet body 7 is sealed with a sealing material 1.
A nut 11 having an insertion hole 11b is screwed through 1a.

A ring-shaped jaw 12 is provided on the inner periphery of the lower hole of the water faucet main body 7, and a female thread 7b is formed on the inner peripheral surface of the vertical pipe of the water faucet main body 7.

Reference numeral 13 denotes a cylindrical core made of a hard material such as metal, hard resin, and ceramic.
An annular collar portion 14 that engages with the jaw portion 12 is formed on the upper part of the
A screw portion 15 is provided on the outer peripheral surface of the cylindrical core 13, and the cylindrical core 13 is fitted into a lower hole of the water faucet main body 7, and a flange portion 14 is provided.
Is engaged with the jaw 12 to project the cylindrical portion 13a of the core 13 downward. Screw part 1 formed on this cylindrical part 13a
5, the screw shape is not particularly limited. For example, as shown in FIG. 4, if the upper side is formed in a planar state, the tapping connection by press-fitting with the water distribution hole 6 becomes stronger.

Further, the outer diameter of the cylindrical portion 13a of the cylindrical core 13 is formed to be larger than the inner diameter of the water diversion hole 6 formed in the resin main pipe 1, and the cylindrical portion 13a is formed in the water diversion hole 6. The tubular core 13 is firmly fixed to the resin main pipe 1 by tapping in a press-fit state.

Reference numeral 16 denotes a cylindrical metal drilling blade. A threaded portion 16a is formed on the outer periphery of the upper portion of the drilling blade 16, and the lower end hexagonal portion of the rotary shaft 17a of the drilling tool 17 is formed on the upper end. An engaging portion 16b of a hexagonal hole to be fitted is provided, and an inner peripheral ridge 16c for holding the perforated section 1a of the resin main pipe 1 is provided on an inner periphery below the perforating blade 16. As described later, the piercing blade 16 of this embodiment can be used only once, so that quenching and the like can be omitted.

A cylindrical core 13 is placed around the outer periphery of
The core 13 is temporarily fixed in the axial direction via the ring 18.
The blade portion 16d protrudes from the lower end of the cylindrical portion 13a.

The rotation feed pitch of the external thread portion 16a of the drilling blade 16 and the pitch of the thread portion 15 on the outer periphery of the cylindrical core 13 are made to match. When the shaft 17a is rotated, the screw portion 15 of the cylindrical core 13 is screwed firmly into the water distribution hole 6 while self-tapping.

Further, the cylindrical core 13 and the drilling blade 16 are provided with a transmission portion 19 which meshes in the drilling direction but does not mesh in the reverse direction. In this embodiment, as shown in FIGS. And a pair of one-way clutch structures each having a pair of inclined surfaces 19a and locking portions 19b at the lower ends of the cylindrical core 13 and the external thread portion 16a of the boring blade 16. The transmission unit 19 is not limited to the one-way clutch structure as in the present embodiment, but may be a transmission unit having a structure that rotates co-rotating in the normal rotation direction and does not reliably transmit the rotation in the reverse rotation.

As shown in FIG. 9, the transmitting portion 19 on the side of the drilling blade 16 may be constituted by a transmitting portion 19 by a projection structure 19c. The numeral 20 shown in FIG.
Is a lid that closes the insertion hole.

Next, the operation of the above embodiment will be described. The engaging portion 1 of the drilling blade 16 in which the lower end hexagonal portion 17b of the rotary shaft 17a of the drilling tool 17 is screwed into the female thread portion 7b of the water faucet main body 7.
6b, the drilling tool 17 is rotated manually or automatically, and the male thread 16a of the drilling blade 16 is screwed into the drilling blade 1.
When the cylinder 6 is rotated down, the cylindrical core 13 fitted on the outer periphery of the perforation blade 16 also rotates down at the same time and is positioned as shown in FIG.

Next, when the drilling tool 17 is rotated from the state shown in FIG. 1 and the drilling blade 16 and the cylindrical core 13 are further rotated down, the blade portion 16d of the drilling blade 16 drills the resin main pipe 1 while drilling. The perforated section 1a is inserted into the inner peripheral ridge 16c of the perforated blade 16.
And the water diversion hole 6 is drilled.

At this time, the screw portion 15 of the cylindrical core 13 having a larger diameter than the hole is lowered while being press-fitted while being integrally rotated while simultaneously drilling an outer diameter hole by the drilling blade 16.
The thread portion 15 of the cylindrical core 13 having the same pitch as the thread pitch of the external thread portion 16a of the boring blade 16 is screwed into the water distribution hole 6 while self-tapping.

Furthermore, the jaw 1 provided on the lower part of the water faucet body 7 with the flange 14 of the cylindrical core 13 being rotated down and screwed in.
2, the state is as shown in FIG. 2 and the insertion is completed.

Next, when the rotation shaft 17a of the drilling tool 17 is rotated in the reverse direction from the state shown in FIG.
Is detached from the cylindrical core 13, the cylindrical core 13 is fixed in a state where it is securely pressed into the water distribution hole 6, and only the perforation blade 16 holds the perforated section 1 a inside, while the water faucet main body is 7
3 and the state shown in FIG. 3 is obtained. After that, the rotary shaft 17a is removed, and the lid 20 is attached to the nut 11 while the drilling blade 16 is incorporated. Can be completed in one step.

FIG. 10 shows another example of a saddle water tap for a resin pipe according to the present invention, in which the male and female of the connection relationship of the drilling tool are reversed, and the drilling blade 21 having an O-ring 21c on the outer periphery. The female screw portion 21a is rotated and screwed in, and a female mounting portion 17d provided at the lower end of the rotating shaft 17c and a male mounting portion 21b provided at the upper end of the drilling blade 21 are detachably provided.

FIG. 11 shows still another example of the saddle tap according to the present invention, in which a drilling blade 22 is provided on the drilling tool 23 side. In FIG.
6, a ball mechanism 24 that opens and closes with a stem 24a is provided, and the drilling tool 23 is rotated manually by a manual handle 23a or automatically.
b, the screw portion 22a of the drilling blade 22 is screwed, and the cylindrical core 13 and the drilling blade 22 are simultaneously rotated in the same manner as in the above example, so that the drilling and the mounting of the core 13 are performed in one step. I have. In this case, after the attachment is completed, the cap 25 is removed from the water faucet main body 26, and the drilling tool 23 and the drilling blade 22 are removed.
Is removed from the water faucet body by removing the cap nut from the body 26, and a lid (not shown) is placed on the upper end of the body 26 to hermetically seal it.
Since the perforating blade 22 is not disposable unlike the above, it is preferable to use a hardened material for the cutting tool.
In the above-described example, the diversion holes and the press-fit tapping of the cylindrical core are performed in one process. However, the tubular core may be press-fitted and tapped on the pre-drilled one.

[0028]

As is apparent from the above description, crimp deformation of the resin main pipe is prevented by press-fitting and tapping the cylindrical core into the water distribution hole, and the sealing force of the gasket provided on the outer peripheral surface of the water distribution hole. Can be held for a long period of time, and the cylindrical core can be more firmly connected to the water distribution hole by press-fitting tapping, and a saddle water faucet with increased reliability can be obtained.

In addition, drilling and core insertion can be performed in a single step, which simplifies the operation. Moreover, there is no danger of misalignment of the core or saddle between drilling and core insertion. It can be completed and the situation such as fluid leakage can be prevented.Furthermore, even if a pulling force is applied to the resin main pipe during use and the main pipe becomes thinner, the sealing force of the gasket is reduced. Has excellent effects such as being reliably maintained over a long period of time. Further, in the embodiment shown in FIGS. 1 to 3, the water tap does not require a water stop mechanism such as a cock.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal sectional view showing a state before the start of piercing of a resin pipe saddle tap according to the present invention.

FIG. 2 is a longitudinal sectional view showing the state of FIG. 1 at the time of perforation and mounting of a core.

FIG. 3 is a longitudinal sectional view showing a state in which the boring blade is pulled up to an upper end in the state of FIG. 2;

FIG. 4 is a partially enlarged view showing a core and a perforation blade of the water faucet of FIG. 2;

FIG. 5 is an exploded perspective view showing a state where a water faucet and a perforation blade / core are disassembled.

FIG. 6 is an exploded perspective view showing a state where a water faucet, a cap, a perforation blade, and the like are disassembled.

FIG. 7 is a partially enlarged view showing a state in which a core is tapped in a water diversion hole of a resin pipe and the core is engaged with a water tap.

FIG. 8 is a plan view of a cylindrical core.

FIG. 9 is a bottom view showing a transmission structure showing another example of the drilling blade.

FIG. 10 is a partial longitudinal sectional view showing another example of the piercing device of the water tap according to the present invention.

FIG. 11 is a longitudinal sectional view showing still another example of the drilling tool according to the present invention.

[Explanation of symbols]

 1 Main pipe 2 minutes faucet 6 minutes water hole 7, 26 minutes faucet body 12 jaw 13 flange 13a cylindrical part 15 screw part 16, 21, 22 piercing blade 19 transmission part

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[Procedure amendment]

[Submission date] December 4, 1998 (1998.12.
4)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Continued on the front page (72) Inventor Yoshio Hashioka 2040 Nagasaka Kamijo, Nagasaka-cho, Nagakoma-gun, Yamanashi Prefecture F-term in Kitz Nagasaka Plant Co., Ltd. (Reference) 3H019 AA01 AA04 AA07 BA04 BB02 BB08 CA03 DA03 DA10

Claims (2)

[Claims] 1. A saddle water tap which is fixed to a soft resin main pipe and branches a fluid passage, wherein a jaw is provided on an inner periphery of a lower hole of a water tap main body, and an upper part of a cylindrical core made of a hard material such as metal. A flange is provided on the outer periphery, a thread is provided on the outer periphery, a cylindrical core is fitted into the lower hole of the water faucet main body, the flange is engaged with the jaw, and the cylindrical portion of the core is projected downward, and the resin main pipe is provided. A resin characterized in that the outer diameter of the cylindrical portion is made larger than the diversion hole drilled in the hole, the cylindrical portion is tapped in a press-fit state into the diversion hole, and the cylindrical core is fixed to the resin main pipe. Saddle tap for pipe. 2. A cylindrical core is fitted around the perforation blade of the water distribution hole, the rotation feed pitch of the perforation blade and the pitch of the outer thread portion of the cylindrical core are matched, and the cylindrical core and the perforation blade are perforated. The saddle water faucet for a resin main pipe according to claim 1, further comprising a transmission portion that meshes in one direction and does not mesh in the opposite direction.