JP3207364B2 - Plastic pipe outer peripheral cutting tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic pipe outer peripheral cutting tool. Specifically, in the case of plastic pipes used for water pipes and gas pipes, when melting and connecting using joints, plastic pipe outer peripheral cutting that cuts the surface of the plastic pipe in advance to clean the surface For tools.

[0002]

2. Description of the Related Art Conventionally, plastic pipes have been used for water pipes and gas pipes, and an electrofusion joint (hereinafter, referred to as an EF joint) of an electrofusion type is used for connection. This EF fitting is
A coil-shaped heating wire is embedded in the inner peripheral surface of the plastic tube for the joint, and the ends of two plastic tubes to be connected from both ends of the EF joint are inserted, and current is applied to the heating wire. Heat is generated to melt and connect the inner surface of the EF joint and the outer surface of the plastic tube.

[0003] In this case, if foreign matters such as oil and dirt adhere to the outer peripheral surface of the plastic pipe to be connected, a defect is caused due to the foreign matter and complete fusion connection cannot be performed. Therefore, it is necessary to cut and clean the surface of the plastic tube before connecting. For this reason, tools for cutting the surface of plastic tubes have been developed.

As a conventional example of a tool for cutting the surface of a plastic pipe, a plastic pipe outer peripheral cutting tool proposed in Japanese Patent Application No. 8-243204 will be described. As shown in FIG. 4, it comprises a main body 1, a cutting tool 2, a leaf spring 3, a spindle 4, and a core 5. The main body 1 has a substantially paraboloid of revolution on its outer peripheral surface, and has a groove 6
A tool guide hole 7 for guiding a tool is formed at a front portion of the groove 6, and the tool 2 is slidably inserted into the guide hole 7 and urged toward the center by a leaf spring 3. Have been. A boss 9 having a screw hole 8 for supporting the spindle is formed at the center of the rear part of the inside, and a space 10 for accommodating the core 5 is formed substantially over the entire length of the center of the inside.

The spindle 4 is fixed to the boss 9 by screwing a screw portion thereof. The spindle 4 is provided on the ratchet holding portion 11 and at right angles to the axis of the spindle. The ratchet 12 has a ratchet 12 slidably inserted into the hole, and a coil spring 13 for pressing and urging the ratchet 12. The spindle 4
The core 5 is slidably fitted in the spindle boss 1.
4 prevents escape.

The core 5 has a guide portion 16 having an outer diameter capable of being inserted into a plastic pipe to be cut and having a tapered thread portion 15, and a threaded ratchet groove 17 engaged with the ratchet teeth of the ratchet 12 on the inner surface. (See FIG. C) is integrally formed with the cylindrical portion 18 on which is formed.

When using this plastic pipe outer peripheral cutting tool, first, as shown in FIG. 5A, the core 5 is pulled out from the main body 1 until it hits the spindle boss 14. In this case, the core 5 can be easily pulled out since the angles of the teeth of the ratchet 12 and the ratchet groove 17 are oblique in the direction in which it is easy to pull out.

Next, the guide 16 of the core 5 is inserted and pressed into the plastic pipe 19 to be cut, and the tapered thread 15
Is cut into the pipe end of the plastic pipe 19 to be cut. Next, the main body 1 is rotated while being pressed toward the plastic pipe 19 to be cut, so that the
Ratchet 12 moves forward along with
5B, as shown in FIG.
Surface can be cut.

[0009]

The surface of the plastic pipe 19 can be easily cut by the above-mentioned conventional cutting tool for the outer circumference of the plastic pipe, but the cut length L is constant until the plastic pipe 19 is removed from the tool. There is a problem that it cannot be seen because it is disturbed by the main body 1.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to realize a plastic pipe outer peripheral cutting tool which can easily know a cutting end position when a surface of a plastic pipe is cut by a predetermined length.

[0011]

According to the present invention, a cutting tool for cutting an outer periphery of a plastic pipe to be cut 50 is guided forward in the inside thereof. A main body 20 in which a bite guide hole 26 is formed and a boss 28 for supporting the spindle 23 at the rear center is formed; a spindle 23 having a ratchet 31 supported by the boss 28 and biased by a spring;
A core 24 having a guide portion 35 slidably supported by the spindle 23 and insertable into the plastic tube 50 to be cut, and a cylindrical portion 37 having an inner surface formed with a screw-shaped ratchet groove 36 meshing with the ratchet 31; And a cutting tool inserted into a guide hole 26 provided in the main body 20 and pressed and urged by a leaf spring 22 to indicate a cutting end position to the plastic pipe 50 to be cut. In order to make a mark, the abutting portion 40 which abuts against the main body 20 against the end of the plastic pipe 50 to be cut, and the position where the mark 42 is affixed to the plastic pipe 50 to be abutted against the abutting portion 40 are set. An index 41 for instructing is provided.

By adopting this configuration, a plastic pipe outer peripheral cutting tool that can easily know the cutting end position when the surface of the plastic pipe is cut by a predetermined length is obtained.

[0013]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 (a) is a top view, FIG. 1 (b) is a view of FIG. FIG. 2C is a sectional view taken along line II-II of FIG. 1A, FIG.
FIG. 2B is an enlarged view of a portion B in FIG. In the present embodiment, as shown in the sectional view of FIG.
1 and a leaf spring 22, a spindle 23, and a core 24, and the main body 20 is formed in a substantially parabolic shape on its outer peripheral surface, and both sides are formed substantially in parallel so as to be easy to hold.

A groove 25 is formed from the upper surface of the main body 20, and a tool guide hole 26 for guiding a tool is formed at a front portion of the groove 25. The tool 21 can slide in the guide hole 26. It is inserted and urged toward the center by the leaf spring 22. In the center of the rear part of the interior, the spindle 23
A boss 28 having a screw hole 27 for supporting the core 24 is formed, and a space 29 for accommodating the core 24 is formed over substantially the entire length of the inner center.

The boss 28 has a spindle 23
The spindle 23 is fixed by screwing the screw portion. The ratchet holding portion 30 and the ratchet holding portion 3
The ratchet 31 has a ratchet 31 slidably inserted into a hole provided at a right angle to the spindle of the spindle, and a coil spring 32 for urging the ratchet 31.

A core 24 is slidably fitted in the spindle 23 and is prevented from coming off by a spindle boss 33. The core 24 has an outer diameter capable of being inserted into a plastic pipe to be cut. In addition, a guide portion 35 having a taper screw portion 34 and a cylindrical portion 37 having a screw-shaped ratchet groove 36 formed on the inner surface thereof for meshing with the ratchet teeth of the ratchet 31 are integrally formed.

The above is the same as the conventional example described with reference to FIG. 4, and the feature of this embodiment is that, as shown in FIG.
Is provided with means for designating a position where a mark for indicating the end of cutting is provided on the cut plastic pipe 50.

This means, as shown in FIG.
A pipe abutting portion 40 is provided at a step portion at the front of the body, and an index 41 for marking a position indicating a cutting end position is provided on a side surface of the main body. The indicator 41 may be either a protrusion or a groove, and the protrusion or groove is preferably colored white or red.

The operation of the embodiment constructed as described above will be described with reference to FIG. First, as shown in FIG. 3A, the end of the plastic pipe 50 to be cut is abutted against the abutting portion 40, and the mark 42 is marked at the position of the index 41 by magic or the like.
Attached. Next, as shown in FIG. 3 (b), the end of the plastic pipe 50 to which the mark 42 is attached is inserted into the guide portion 35 of the core 24 drawn out from the main body, and then the main body 20 is rotated to rotate the plastic pipe to be cut. The outer circumference of the tube 50 can be cut. Then, when the mark 42 previously marked coincides with the end of the main body 20 as shown in FIG. 3C, the cutting of the predetermined length is completed.

[0020]

According to the present invention, the main body is provided with means for indicating the position at which a mark for indicating the cutting end position on the plastic pipe to be cut 50 is provided on the main body. The end position of cutting can be known very easily, and cutting of a predetermined length can be reliably performed, which can contribute to improvement of workability.

[Brief description of the drawings]

1A and 1B are diagrams showing an embodiment of the present invention, in which FIG. 1A is a top view, FIG. 1B is a diagram viewed from arrow Z in FIG. 1A, and FIG. 1C is a diagram viewed from arrow Y in FIG. is there.

FIG. 2 is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention.

4A and 4B are views showing a conventional plastic pipe outer peripheral cutting tool, wherein FIG. 4A is a cross-sectional view, FIG. 4B is a front view, and FIG.
It is a C section enlarged view of the figure.

FIG. 5 is a view for explaining the operation of a conventional plastic pipe outer peripheral cutting tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Body 21 ... Tool 22 ... Leaf spring 23 ... Spindle 24 ... Core 25 ... Groove 26 ... Tool guide hole 27 ... Screw hole 28 ... Boss 29 ... Space 30 ... Ratchet holding part 31 ... Ratchet 32 ... Coil spring 33 ... Spindle boss 34 ... taper screw part 35 ... guide part 36 ... ratchet groove 37 ... cylindrical part 40 ... butting part 41 ... index 42 ... mark 50 ... plastic pipe to be cut

──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 000001052 Kubota Co., Ltd. 1-47, Shishitsuhigashi 1-chome, Namiwa-ku, Osaka-shi, Osaka (72) Inventor Hiroshi Yoshida 1-2-1 Hanazono-Nishicho, Higashi-Osaka-shi, Osaka 7 (72) Inventor Ryo Sakaguchi 147-5 Matsumidai, Ikoma City, Nara Prefecture (72) Inventor Satoru Ishikawa 6-59, Kayashi-cho, Yao City, Osaka Prefecture (72) Inventor Hiroshi Oya 2nd Daifuku, Kuwana-shi, Mie Prefecture Hitachi Metals Inside the Kuwana Plant (72) Inventor, Toshihiko Tsujimura 2nd Daifuku, Kuwana-shi, Mie Prefecture Inside the Kuwana Plant, Hitachi Metals Co., Ltd. (72) Inventor, Kazunori Umeda 2480 Mado, Hiratsuka-shi, Kanagawa Prefecture, Japan ) Inventor Makoto Yamamoto 2480 Mado, Hiratsuka-shi, Kanagawa Pref. Inside the Hiratsuka Plant of Mitsubishi Plastics Co., Ltd. (72) Inventor Shinsaburo Oshimo 64 Ishizukita-cho, Sakai-shi, Osaka Inside the vinyl factory (72) Inventor Tetsuhiro Yoshimura 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside the Kubota vinyl factory (56) References JP-A-6-79501 (JP, A) JP-A-8-112702 (JP) JP-A-2-269503 (JP, A) JP-A-2-243204 (JP, A) JP-A-63-144901 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B23B 5/12

Claims (1)

(57) [Claims] An outer peripheral surface has a substantially paraboloid of revolution shape, and a bite guide hole (26) for guiding a bite (21) for cutting an outer circumference of a plastic pipe to be cut (50) is formed in an inner front portion, and a rear portion. A boss (2) supporting the spindle (23) at the center
A spindle (23) supported by the boss (28) and having a ratchet (31) biased by a spring, and slidably supported by the spindle (23). A core (35) having a cylindrical portion (37) formed on the inner surface thereof with a guide portion (35) that can be inserted into the cut plastic tube (50) and a screw-shaped ratchet groove (36) that meshes with the ratchet (31). 24) and the main body (2
0) is inserted into the guide hole (26) provided in the leaf spring (2).
2. A cutting tool for cutting an outer periphery of a plastic pipe comprising a cutting tool (21) pressed and urged in 2), wherein a mark for indicating a cutting end position is provided on the plastic pipe to be cut (50). An abutting section (40) for abutting the end of the plastic pipe to be cut (20) against (20) and a mark (42) on the plastic pipe to be cut (50) abutting against the abutting section (40). A plastic pipe outer peripheral cutting tool provided with an index (41) indicating a position.