JP2002005381A - Boring device for resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate interference of propulsive force of a spindle screw and a bush screw when screw propulsive force is imparted to a spindle so as not to generate excessive propulsive resistance force in the plastic bush at the time of propulsion. SOLUTION: While a hole cutter 7 bores a resin pipe 8 after the cutter 7 is cut into a pipe wall 8a of the resin pipe 8, a male screw 5a is formed in an outside face part of the spindle 5 passing a rear end face of a cap 4, a female screw screw-fitted into the male screw 5a is formed on an internal surface of a through hole of the cap 4, and a cap body rear end face member 9 having the formed female screw is separated from the cap body main body 4 and is mounted on the cap body main body 4 so as to be movable in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin pipe piercing apparatus, and more particularly to a resin pipe piercing apparatus for piercing an opening which opens into a branch pipe when a branch saddle is attached to the resin pipe main pipe.

[0002]

2. Description of the Related Art In recent years, as a pipe for a gas pipe, a synthetic resin pipe excellent in chemical resistance, corrosion resistance, and the like, for example, a polyethylene pipe has been increasingly used.

[0003] In addition to the above advantages, these synthetic resin pipes
Another advantage is that the main pipe can be easily provided with an opening hole in the branch pipe. As a tool for drilling this opening, a hole cutter having a bush that is threadedly fitted into a female screw formed on the inner surface of the branch pipe is screwed into the branch pipe, and the bush is rotated from outside the branch pipe via a spindle. There has been known a resin pipe drilling apparatus in which a hole cutter is cut into a resin main pipe by an amount of screwing at this time.

By the way, in the case of gas piping, a hole cutter may be left in a branch pipe together with a bush after drilling an opening hole in the branch pipe. Therefore, the bush of the hole cutter is made of plastic so as not to be uneconomical even when disposable.

However, if the bush is made of plastic, when the hole cutter starts to bite into the wall of the resin main pipe, the propulsion resistance increases. Therefore, if the rotational force is continuously applied forcibly, the thread of the plastic bush is crushed. As a result, there is a drawback in that the screw cannot be pushed forward and drilling is impossible.

[0006] Further, when such a screw thread is crushed, there is a problem that it is difficult to take out and collect the plastic bush by reverse rotation. In order to solve such a problem, a drilling device 6 for a resin pipe as shown in FIG. 5 has been considered as a screwing device for a plastic bush.

[0007] The resin pipe drilling device 6 includes a branch saddle 1.
Cylindrical body part 3 whose tip 3a is externally fitted and fixed to the branch pipe 2
A cap body 4 fitted to the rear end of the cylindrical main body 3 by screw fitting or the like; and a rear end face 4a of the cap body 4
And the tip is propelled along the axial direction of the branch pipe 2,
A spindle 5 supported so as to be retractable, a male screw formed at a rear end 5 a of the spindle 5, and the male screw is screw-engaged with a female screw formed at a through portion of the rear end face 4 a of the cap body 4. Have been.

In order to use the resin pipe drilling device 6, a bush 7 connected to a rear portion of the hole cutter 7 is required.
a is screwed into the branch pipe 2 until the end face a is flush with or slightly into the end face of the branch pipe 2, and then the cylindrical main body 3 is connected to the branch pipe 2.
After screwing firmly to the end and fixing the end with an O-ring 3e to seal the end, the tip of the spindle 5 is connected to the plastic bush 7a, and then the spindle 5 is rotated by a rotary driving tool or device (not shown). Thereby, the plastic bush 7a is propelled along the female screw on the inner surface of the branch pipe 2.

In this case, when the hole cutter 7 is propelled and cuts into the pipe wall 8a of the resin pipe 8, as shown by a dotted line in FIG. 6, the rear end 5a of the spindle 5 and the through hole of the cap body rear end face 4a. 4b is screwed into the female screw, and a push-forward force is applied to the spindle 5 by this screw fitting.
Thus, the pushing of the plastic bush 7a by the screw is assisted, and the assisting force propels the bush 7a without completely crushing the thread of the bush until the hole is completely pierced as shown by the solid line.

The diameter of the spindle 5 is set at the rear end 5a.
The diameter at the tip end side is smaller than that of the threaded portion, and the spindle 5 can be moved directly in the axial direction without screwing the inside of the through hole 4b in this small diameter portion. In the drawing, reference numeral 3c denotes a packing for hermetically sealing the outer periphery of the spindle 5, and 3d denotes an O-ring for sealing.

In the figure, reference numeral 61 denotes a pilot pipe for checking the penetration state of the perforation.
An elbow 63 is communicated with a through hole 62 formed in the side surface of the cylindrical main body 3 for confirming gas flow, and a protective plug 65 is connected to a distal end of a coupler 64 connected to the elbow 63.
Are fitted, and the outflow of gas is controlled by the attachment and detachment of the protective plug 63.

[0012]

In the above configuration,
The spindle 5 has a bush 7 on the tip side on the same axis.
a and the rear end side screw 5a are screw-fitted at two different places, so that the hole cutter 7 is
When the resistance is increased by cutting into a, when there is a difference in the mutual screw pitch in the state where the two screws are pushed forward, the mutual screw parts interfere and the rotation of the spindle 5 becomes very heavy, so that the pushing can be performed. There was a problem that disappeared.

The present invention solves the above-mentioned problems, and in the case where a feed screw is also formed on the spindle for protecting the thread of the plastic bush, the interference caused by the difference between the screw feed pitches of the two can be quickly eliminated to ensure safety. The object of the present invention is to make a hole in a hole.

[0014]

According to a first aspect of the present invention, there is provided a resin pipe piercing device, comprising: a tubular main body externally fitted and fixed to a branch pipe of a branch saddle attached to an outer surface of a resin pipe; A cap body fitted to the rear end of the tubular main body, a spindle penetrating the rear end face of the cap body, and having a front end propelled along the axial direction of the branch pipe and supported so as to be retractable; In a resin pipe drilling device having a hole cutter which is rotated around a shaft by a spindle and is axially propelled by being fitted with a female screw provided on the inner surface of the branch pipe,
After the hole cutter is cut into the resin tube wall,
Until the resin tube is completely pierced, a male screw is formed on an outer surface portion of the spindle passing through the rear end surface of the cap, and a female screw is formed on an inner surface of the through hole of the cap so as to be thread-fitted with the male screw. In addition, the rear end face member of the cap body having the female screw is separate from the cap body and is attached to the cap body so as to be movable in the axial direction.

That is, since the rear end member of the cap is movable in the axial direction, if the mutual thread portion interferes during the screw advance of the spindle, the spindle is rotated in the reverse direction, and the axial position of the rear end member of the cap is moved. Is displaced, the shift between the two pitches is eliminated, and the spindle can be rotated again.

According to a second aspect of the present invention, there is provided a resin pipe piercing apparatus.
In the punching device for a resin pipe described in the above, an urging member for urging the spindle to protrude toward the resin pipe is interposed between the spindle and the cap body.

When the resin pipe piercing device is used in a vertical arrangement, the spindle falls under its own weight, so that the connection with the bush is ensured. Therefore, no urging member is particularly required. In some cases, the perforating device may be arranged horizontally or overturned. Even in such a case, the urging member is urged in the projecting direction to ensure the connection between the spindle and the bush.

According to a third aspect of the present invention, there is provided a resin pipe piercing apparatus.
Alternatively, in the second resin pipe drilling device, there is provided a stopper device which snap-engages with a spindle drawn into the inner surface of the cylindrical main body and temporarily fixes the spindle in the axial direction.

Therefore, according to this resin pipe piercing device,
Even if the spindle is constantly biased by a spring, it can be temporarily fixed at the retracted position.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of a resin pipe punching apparatus according to an embodiment of the present invention. FIG. 1 is a sectional view of a main part of a perforation device for a resin pipe.

The resin pipe piercing apparatus of this embodiment is the same as the conventional resin pipe piercing apparatus except that the structure of the cap body is different, so that only the different parts will be described.

In FIG. 1, the rear end face member 9 of the cap body 4 provided at the rear end of the cylindrical main body 3 of the resin pipe drilling device 6 is separate from the cap body 4, and after the separate body. When the end member 9 is attached to the rear end surface of the cap body 4, the head 10 a is attached with a bolt 10 that does not completely fix the rear end member 9 at a completely tightened position.

That is, in the illustrated example, a screw hole 4b for a bolt is formed in the rear end face of the cap body 4, and a collar 10b and a washer 10c are formed in the bolt 10 screwed into the hole.
And are fitted outside. A bolt head 10 is attached to the rear end face member 9.
A counterbore 9b capable of accommodating the a and the washer 10c is formed, and a through-hole 9a having a diameter that allows the collar 10b to pass therethrough but not the washer 10c is formed on the bottom surface of the counterbore 9b.

The bottom of the counterbore 9b is made thinner than the axial length of the collar 10b, so that a gap S is formed between the bolt head 10a and the bottom of the counterbore 9b. .

Therefore, the rear end face member 9 can be moved in the axial direction as shown by the arrow P by the gap S. The moving distance indicated by the arrow P is for absorbing or correcting the deviation of the thread pitch at both ends of the spindle 5, and therefore, at most 1.5 to 2 times the internal thread pitch formed on the inner surface of the branch pipe. It should just be about twice.

Reference numeral 9c denotes a spindle 5 on the rear end face member 9.
A female screw 9d is formed on the inner surface of the hole so as to fit with the male screw 5a at the rear end of the spindle 5. The relationship between the diameter of the through hole 9c and the diameter of the spindle 5 is such that the spindle 5 can smoothly move in the axial direction in the axial direction until the rear end 5a of the spindle 5 is screwed in, as in the prior art. 5b.

Next, the operation of the above embodiment will be described. As shown in FIG. 2, after the end surface of the bush 7 a in which the hole cutter 7 is connected to the branch pipe 2 of the branch saddle 1 is screwed until the end face of the bush 7 a is slightly flush with the end face of the branch pipe 2, the cylindrical body is inserted into the branch pipe 2 The part 3 is externally fitted and screwed into the branch pipe 2
Is screwed until the end surface thereof comes into pressure contact with the sealing O-ring 3e on the inner surface of the inner end of the cylindrical main body 3.

At this time, since the spindle 5 penetrates the rear end face member 9 at the small diameter portion and is not screwed, the spindle 5 can be freely moved in the axial direction, and the cylindrical main body 3 can be easily mounted. Next, the spindle 5 is connected to the cylindrical bush 7a.

This connection is made by fitting a hexagonal nut-like tip 5c formed at the tip of the spindle 5 into a similarly shaped recess 7b formed at the rear end face of the plastic bush 7a. If the spindle 5 is rotated around the shaft while being pushed in the bush direction, the fitting can be easily performed.

At this time, the spindle 5 is
Since the cylindrical body 3 can be freely moved in the axial direction without screw-fitting, the external fitting of the tubular main body 3 to the branch pipe 2 can be easily performed. After this mounting, a rotational force is applied to the bush 7a via the spindle 5 by an appropriate means.

The rotation force causes the hole cutter 7 to be screwed into the branch pipe 2, and the tip of the cutter comes into contact with the resin main pipe 8. At this time, as shown in FIG. 3, the male screw portion 5a at the rear end of the spindle 5 is screwed into the female screw 9d of the rear end surface member 9, but the rear end surface member 9 is movable in the axial direction by a distance S. Therefore, the rear end face member 9 moves toward the rear end of the spindle 5 as shown by the arrow q, and the gap between the two is corrected.

Therefore, by the screwing of the spindle 5, the bush 7 a is strongly and accurately fed by the spindle 5. Accordingly, even with the plastic bush 7a, the thrust assisting force is obtained by the screw 5a at the rear end of the spindle 5, and there is no accident such as an increase in the screw feed force or the collapse of the screw thread.
Is performed.

Next, when it is confirmed from the axial insertion amount of the spindle 5 that drilling of the hole cutter 7 has been completed,
Is rotated in the reverse direction, the hole cutter 7 is pulled upward from the branch pipe 20 of the branch pipe 2, and after checking the opening by the pilot pipe 61, the spindle 5 is pulled up and the hole cutter 7 and the bushing 7 a are left. Is removed, and the opening end of the branch pipe 2 is sealed with a cap lid (not shown) to complete the opening operation.

Therefore, according to the resin pipe drilling apparatus 6 of this embodiment, when the branch pipe 2 is provided on the resin main pipe 8 with the branch saddle 1, the shaft provided from the rear end face member 9 of the resin pipe drilling apparatus 6 to the spindle 5 is provided. The axial force can be supplementarily applied to the bush 7a which is screw-fitted to the inner surface of the branch pipe 2 by the directional pressing force, and the screw feed force becomes heavy or the bush 7a
Accidents such as crushing of the thread can be reliably prevented.

In the above embodiment, a helical spring 11 is externally fitted to the spindle 5 as shown in FIG. 2 or FIG. Workability is improved.

That is, the helical spring 11 has an inner diameter capable of receiving the spindle 5, the tip 11 a is locked to the tip of the spindle 5, and the rear end 11 b is locked to the inner rear end of the cylindrical main body 3. As shown in FIG. 2, 11 is compression-inserted between these locking portions.

For this reason, the spindle 5 is always urged in the projecting direction, and more specifically, the engagement state with the bush 7a is always maintained. In particular, when the branch pipe is attached to the lateral side or the bottom other than the upper surface of the resin pipe for the convenience of piping, and the resin pipe drilling device 6 is horizontally or overturned, the spindle 5 and the bush 7a are securely connected. Work is performed reliably.

A circumferential groove 5e for engagement is provided on the outer surface of the distal end portion of the spindle 5, and the distal end elastically fits into the circumferential groove 5e on the side surface of the through hole 3b for the spindle 5 of the cylindrical body 3. If the plunger 12 is provided, the workability is further improved.

In this case, if the spindle 5 is pulled into the cylindrical main body 3 and the tip of the plunger 12 is engaged with the circumferential groove 5e in a snap shape, the spindle 5 is temporarily fixed to the cylindrical main body 3 in the retracted state. Is done.

Accordingly, when the hole cutter 7 is mounted, the axial movement of the spindle 5 can be fixed, which is convenient. Also, when removing the cylindrical main body 3 from the branch pipe 2, after the bush 7a is reversely rotated and retracted to a predetermined position, the spindle 5 is pulled out in the axial direction, and the tip of the plunger 12 is inserted into the circumferential groove 5e. By engaging in a snap shape, the spindle 5 can be temporarily fixed, and the work of removing the tubular main body 3 becomes easy.

Further, even when the spindle is projected and urged by the spring, the spindle can be temporarily fixed at a position where the spindle is retracted against the urging force, and the work of attaching and detaching the tubular main body to and from the branch pipe 2 becomes easy.

[0042]

As described above, according to the resin pipe drilling device of the present invention, when a branch saddle is attached to a resin pipe and an opening that opens to the branch pipe is drilled in the resin main pipe, it is connected to a hole cutter. The drilling operation can be carried out safely without causing an accident such as the collapse of the thread of the bush.

According to the drilling device for a resin pipe of the second aspect, the drilling operation can be performed with good workability even when the branch pipe is attached to the side or bottom surface of the resin main pipe. According to the punching device for a resin pipe of the third aspect, the floating of the spindle and the projecting state by the spring can be eliminated, and the workability at the time of attaching and detaching the punching device for a resin pipe is improved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a resin pipe drilling device according to an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view of a perforation apparatus for a resin pipe according to an embodiment of the present invention.

FIG. 3 is a sectional view for explaining the operation of the resin pipe drilling device according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing another configuration example of the resin pipe punching device according to the embodiment of the present invention.

FIG. 5 is a sectional view of a conventional example.

FIG. 6 is an operation explanatory sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch saddle 2 Branch pipe 3 Cylindrical main body part 4 Cap body 4b Screw hole for bolt 5 Spindle 5b Male screw 6 Drilling device for resin pipe 7 Hole cutter 7a Bush 9 Rear end face member of cap body 9b Counterbore part 9d Female screw 10 Bolt 10a Bolt head 10b Collar 10c Washer

Continued on the front page (72) Inventor Takeshi Omatsu 424 Uchiko-cho, Uchiko-cho, Kita-gun, Ehime F-term in Ooka Works (reference) 3C060 AA04 BA05 3H019 BA01 BB02 BD05

Claims (3)

[Claims] 1. A tubular main body portion externally fitted and fixed to a branch pipe of a branch saddle attached to an outer surface of a resin pipe, a cap body fitted to a rear end of the cylindrical main body section, A spindle that penetrates the rear end face, the tip of which is propelled along the axial direction of the branch pipe, and is supported so as to be able to retreat, is rotated around the axis by the spindle, and is fitted with a female screw provided on the inner surface of the branch pipe. And a hole cutter propelled in the axial direction, wherein after the hole cutter is cut into the resin pipe tube wall, the cap rear end surface is cut until the hole is completely drilled in the resin tube. A male screw is formed on an outer surface portion of the spindle that passes therethrough, and a female screw that is screw-engaged with the male screw is formed on an inner surface of the through-hole of the cap, and a cap body rear end surface member formed with the female screw is provided. ,cap Body and is separate from, and the cap body movably mounted resin pipe perforation device comprising axially relative. 2. The resin pipe drilling device according to claim 1, wherein an urging member for urging the spindle to project toward the resin pipe is interposed between the spindle and the cap body. 3. The resin pipe drilling device according to claim 1 or 2, wherein a stopper device is provided for engaging the spindle drawn into the inner surface of the cylindrical body in a snap-like manner and temporarily fixing the spindle in the axial direction. apparatus.