JPH11277498A - Hole saw for boring polyethylene pipe for water distribution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hole saw for boring a polyethylene pipe for distribution water to efficiently bore a hole, communicated with the water flow port of a corporation cock, in a distribution water pipe formed of high density polyethylene and prevent the occurrence of an influence due to chips. SOLUTION: A hole saw 2 coupled to the rotary shaft 21 of a drive part through a shank 4 consists of a device forming a cutting edge 6, a deep hole 5, and a groove 7 and provided on the opening side with a helical groove 8 and is covered with a guide pipe 3. The hole saw 2 is inserted in the water flow port of a corporation cock and by boring by the cutting edge 6, chips generated by boring are contained in the deep hole 5 of the hole saw 2. The cutting edge 6 consists of a single blade or a plurality of blades.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water distribution polyethylene pipe for drilling a hole communicating with a water outlet of a water faucet.

[0002]

2. Description of the Related Art Cast iron pipes, vinyl chloride pipes and the like are used as water distribution pipes, but recently, high density polyethylene pipes are used. These distribution pipes are fitted with a faucet saddle equipped with a faucet. That is, as shown in FIG. 9, a high-density polyethylene pipe 22, which is one of the water distribution pipes, is sandwiched by a water faucet saddle 25 in which an upper saddle 23 and a lower saddle 24 are connected by bolts and nuts. As shown, a water tap 27 is screwed to the upper saddle 23 via a sealing material 26 such as a gasket. A water passage 28 is formed in the center of the water faucet 27 so as to penetrate therethrough. A water passage 29 perpendicular to the water passage 28 communicates with a water passage on the use side through an on-off valve 30. A cap (not shown) is screwed on the upper side of the water tap 27 to shut off the water inlet 28 from the outside air.

In order to connect the inside of the water pipe with the water port 28 of the water faucet 27, the water port 28 of the high-density polyethylene pipe 22 is connected.
A hole 31 is formed in a portion opposite to. The drilling forsaw 1 of the present invention is for drilling the hole 31 efficiently.

[0004] There are various types of drilling holes for drilling the hole 31, and the drilling holes 1a shown in Figs. 12 and 13 are generally widely used. As shown in the figure, a piercing holster 1a is a holster 2 formed with a cutting edge 32 at the tip.
a and a shank 4a connected thereto.
The Horso 2a is formed of a cylindrical body having a hole 33, and four cutting edges 32 are formed on the opening side. A plurality of (four) grooves 34 are formed on the outer periphery of the fortress 2a and open to the opening side and communicate with the holes 33. The cutting edge 32 has a second corner formed along the rotation direction.

[0005]

The holster 2a of the piercing holster 1a having the above-mentioned structure is inserted into the water inlet 28 of the water tap 27 shown in FIG. 9, and the drive unit connected to the shank 4a is operated. Thereby, the wall of the water distribution pipe is perforated. When the material of the water distribution pipe is cast iron, it can be perforated by the conventional perforating hoso 1a. However, in the case of the high-density polyethylene pipe 22, there are the following problems. That is, the high-density polyethylene pipe 22 is more flexible and sticky than the cast iron water pipe. Therefore, the chips are continuous without being separated during drilling. That is, in the case of a water distribution pipe made of another material, the chips are not filled in the holes 33 and discharged to the outside through the grooves 34 because the chips are not continuous. However, high-density polyethylene tube 2
In the case of No. 2, the chips are continuous and become a cylindrical chip 11 as shown in FIG. Therefore, in the case of the conventional drilling hole saw 1a, the cutting powder 11 is filled in the hole 33 or between the hole drilling hole 1a and the hole 33 and is not discharged from the groove 34. For this reason, there is a problem that the perforation becomes impossible on the way. Furthermore,
In the case of the high-density polyethylene tube 22, the wall thickness of the wall portion is often large, and there is a problem that the perforation becomes more difficult.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and has no effect on drilling work due to cutting powder generated when drilling a water pipe made of high-density polyethylene, so that polyethylene for water distribution can be efficiently drilled. It is an object of the present invention to provide a holder for drilling a tube.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a water distribution polyethylene pipe sandwiched by a water faucet saddle to which a water faucet is screwed. A drilling hole for drilling a hole communicating with the hole, the drilling hole is a hollow pipe-shaped holder forming a cutting edge at the tip, and a guide pipe fixed to surround the outer periphery of the holder. A shank connected to a drive unit for rotating the forsaw while being connected to the forsaw. The forsaw has a deep hole formed at an appropriate depth therein and opened to the cutting blade side. The outer surface is formed with a groove that opens to the cutting blade side and communicates with the deep hole, and the opening side of the deep hole constitutes a drilling holder for a polyethylene pipe for water distribution in which a spiral groove is engraved. It is. Further, the cutting blade is characterized by comprising a single blade or a plurality of blades, wherein the cutting blade forms a second angle along the rotation direction and a second angle from the cutting edge side toward the pipe center. It is characterized by the following.

[0008] The cutting powder generated by drilling by the single blade or plural blades of the hoso of the present invention is introduced into the deep hole through the groove. In particular, since a spiral groove is formed on the opening side of the Horso, the cutting powder is guided by the spiral groove, smoothly introduced into the deep hole, and embedded therein. That is, since the cutting powder does not need to be discharged to the outside during drilling, the machinability does not decrease during drilling. In addition, since the cutting edge has a second angle formed not only in the rotation direction but also in the radial direction, cutting performance can be improved,
Efficient drilling becomes possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention for drilling a hole for drilling a polyethylene pipe for water distribution according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a drilling horso 1 of this embodiment. The drilling horso 1 includes a horso 2, a guide pipe 3 fixed around the outer circumference, a shank 4, and the like.

[0010] As shown in FIGS. 1 and 2, the Horso 2 is formed of a hollow pipe-shaped steel material having a deep hole 5, and a cutting edge 6 is formed on the opening side of the deep hole 5. In addition, the cutting blade 6 of this example is a single blade. 1 and 5 on the opening side where the cutting blade 6 is located.
A single groove 7 is formed as shown in FIG. The groove 7 communicates with the deep hole 5. A spiral groove 8 is formed on the opening side. On the other hand, a screw hole 9 into which the shank 4 is screwed is formed on the side opposite to the opening side.

The cutting blade 6 has an upper surface shape as shown in FIG. 5, and as shown in FIG. 6, a second angle α is formed in a direction along the rotation direction. Further, an inclination angle of an angle θ is formed along the vertical direction in the drawing. The inclination angle of the groove 7 is also θ, and the upper end of one edge forming the groove 7 is a cutting edge 6.
Is formed. Also, as shown in FIG.
The cutting edge 6 forms a second angle of the angle β along the radial direction, and forms a clearance angle portion of the angle γ along the vertical direction.
By forming the above-mentioned second corners and clearance corners in the cutting blade 6, the high-density polyethylene pipe 22 having stickiness can be efficiently drilled. As described above, the spiral groove 8 guides the cutting powder 11 (FIG. 11) cut by the cutting blade 6, and the cutting powder 11 guided by the spiral groove 8 is guided into the deep hole 5. It accumulates.

FIG. 3 is an axial sectional view showing the guide pipe 3. The guide pipe 3 is composed of a thin pipe portion 12 and a thick portion 13 integrally formed at one end thereof. The inner diameter of the thick portion 13 has a size corresponding to the outer diameter of the reduced diameter portion 14 on one end side of the holder 2. The thick portion 13 has a screw hole 16 into which the stop screw 15 (FIG. 1) is screwed, and the reduced diameter portion 14 of the forsaw 2 has a notch 17 into which the tip of the stop screw 15 fits. .

As shown in FIG. 4, the shank 4 is formed of a rod-like body and includes an intermediate rod portion 18 and screw portions 19 and 20 formed at both ends thereof. The screw part 19 is screwed into the screw hole 9 of the horuso 2, and the screw part 20 is screwed into the rotation shaft 21 side of the drive unit shown in FIG.

The drilling horso 1 is such that the guide pipe 3 is put on the outer periphery of the horso 2 having the above-mentioned structure, and the stop screw 15 is screwed into the screw hole 16 of the guide pipe 3 and the tip thereof is pressed against the notch 17 to press the guide pipe 3. Is fixed to Horso 2. Next, the screw portion 19 of the shank 4 is screwed into the screw hole 9 of the Horso 2 to be assembled.

Next, a method for piercing the high-density polyethylene pipe 22 by the piercing horso 1 of the present invention will be described. First, a faucet saddle 25 composed of an upper saddle 23 and a lower saddle 24 is put on the outer periphery of the high-density polyethylene pipe 22. A water tap 27 is screwed to the upper saddle 23 via a seal member 26. The cap (not shown) on the upper part of the faucet 27 is removed. On the other hand, the shank 4 of the drilling horso 1 is
, And the drilling horso 1 is attached to the drive unit side. The horso 2 of the drilling horso 1 is positioned at a position facing the water port 28 of the water tap 27, and the horso 2 is inserted into the water port 28. Activating the rotating shaft 21 of the driving unit,
Is perforated by the cutting blade 6 of FIG.

FIG. 10 shows the state of formation of the cutting powder 11 generated when the high-density polyethylene pipe 22 is pierced with the forsaw 2. The high-density polyethylene pipe 22 cut by the cutting blade 6 does not fall apart like the cutting powder of a water distribution pipe such as cast iron, and becomes the connected cutting powder 11. Since the forsaw 2 is surrounded by the guide pipe 3, the cut powder does not flow out, but is guided by the spiral groove 8, introduced into the deep hole 5 from the groove 7, and accumulated. For this reason, the hole is drilled by the forsaw 2 without resistance to the cutting powder 11, and efficient drilling is performed. FIG. 11 shows a schematic shape of the cutting powder 11 accumulated in the deep hole 5 of the forger 2 at the time of completion of the drilling.

In the above description, the cutting blade 6 of the drilling horso 1 is formed of a single blade. Although a single-edged cutting blade 6 suffices for perforation, as shown in FIG. 8, a hoso 2 that forms three cutting blades 6 may be used. In this case, the shape of each cutting edge 6 is substantially the same as the above-mentioned single cutting edge 6, and a groove 7 is formed between the cutting edges 6, 6. In addition, other structures are the same as those shown in FIG.

[0018]

According to the first aspect of the present invention, according to the first aspect of the present invention, a deep hole or a groove communicating with the cutting blade is provided in the hoso, and the hoso is surrounded by the guide pipe. By adopting the structure, the cutting powder generated by the perforation of the sticky high-density polyethylene pipe is stored in the forso, and the perforation by the cutting powder is not adversely affected, so that efficient perforation can be performed. 2) According to the holso for drilling a polyethylene pipe for water distribution according to the second aspect of the present invention, the structure can be simplified by using a single blade for the holso, and a plurality of blades are used. By
More efficient perforation can be performed. 3) According to the holso for piercing a polyethylene pipe for water distribution according to claim 3 of the present invention, the cutting edge is formed with a double second angle to further improve the machinability.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing the entire structure of a drilling horso according to the present invention.

FIG. 2 is an axial sectional view showing a structure of a fork of a fork for drilling according to the present invention.

FIG. 3 is an axial cross-sectional view showing a structure of a guide pipe of a drilling horso according to the present invention.

FIG. 4 is a plan view showing a structure of a shank of a drilling horso of the present invention.

FIG. 5 is a top view showing the single-edged cutting blade of the forger of the present invention.

FIG. 6 is a front view of the cutting blade of the horsaw according to the present invention, as viewed in the direction of arrow A in FIG. 5;

FIG. 7 is a side view of the cutting edge of the horsaw according to the present invention as viewed in the direction of arrow B in FIG. 5;

FIG. 8 is a top view showing the cutting blade of the three-plate blade of the forger of the present invention.

FIG. 9 is an axial cross-sectional view for explaining a method of perforating a high-density polyethylene pipe by using a perforating hoso according to the present invention.

FIG. 10 is an axial cross-sectional view showing a state in which a cutting powder is stored in a hoso during drilling by the drilling hoso of the present invention.

FIG. 11 is a plan view showing a cutting powder produced by perforating a high-density polyethylene tube with the perforating forrs of the present invention.

FIG. 12 is an axial sectional view showing a conventional drilling horso.

FIG. 13 is a top view as viewed in the direction of the arrow C, showing the cutting blade of FIG. 12;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling horoscope 2 Holtho 3 Guide pipe 4 Shank 5 Deep hole 6 Cutting blade 7 Groove 8 Spiral groove 9 Screw hole 10 Relief angle part 11 Cutting powder 12 Pipe part 13 Thick part 14 Reduced diameter part 15 Stop screw 16 Screw hole 17 Notch 18 Intermediate rod part 19 Screw part 20 Screw part 21 Rotating shaft 22 High-density polyethylene pipe 23 Upper saddle 24 Lower saddle 25 minutes faucet saddle 26 Sealing material 27 minutes faucet 28 water inlet 29 water channel 30 on-off valve 31 hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fukui Chitoku 64 Ishizu-Kitacho, Sakai-shi, Osaka Inside Kubota Vinyl Pipe Factory (72) Inventor Hideo Nakagawa 5072 Soshinda, Satte-shi, Saitama Maezawa Hoso Kogyo Co., Ltd. Inside the company (72) Inventor Shinji Ogino 5072 Soshinda, Satte-shi, Saitama Pref.Inside (72) Inventor Ryuichi Tajima 5072 Soshinta, Satte-shi, Saitama Maezawa Hoso Co., Ltd. Inside

Claims (3)

[Claims] 1. A drilling forsaw for drilling a hole communicating with a water outlet of the water faucet in a polyethylene pipe for water distribution sandwiched by a water faucet saddle to which a water faucet is screwed,
The drilling pier has a hollow pipe-shaped pier having a cutting edge at its tip, a guide pipe fixedly surrounding the outer periphery of the pier, and a drive connected to the hood and rotating the hood. And a shank connected to the cutting portion, wherein the holso has a deep hole of an appropriate depth opened to the cutting blade side therein, and a groove opened to the cutting blade side and communicating with the deep hole on the outer surface thereof. A holster for drilling a polyethylene pipe for water distribution, wherein a spiral groove is formed on the opening side of the deep hole. 2. The drilling hoso according to claim 1, wherein the cutting blade comprises a single blade or a plurality of blades. 3. The polyethylene pipe for water distribution according to claim 1, wherein the cutting edge forms a second angle along the rotation direction and a second angle from the cutting edge side toward the center of the pipe. Horso for drilling.