Cutting tool, method of cutting and method of construction

Abstract

To provide a cutting tool that can reduce burden of a cutting work, and to provide a method of cutting and a method of construction.SOLUTION: A cutting tool 1 includes: a support part 20 for supporting a tool 10 capable of cutting an outer peripheral surface of a resin pipe 2; a feed screw 30 fitted to the support part 20; a pipe fixing part 50 capable of being fixed to the resin pipe 2 to which the feed screw 30 is screwed; and a regulation part 100 capable of being disposed between the support part 20 and the pipe fixing part 50 and regulating approaching between the support part 20 and the pipe fixing part 50.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cutting tool, a cutting method, and a construction method for cutting the outer peripheral surface of a plastic pipe (a variety of plastic tubular members such as plastic piping, plastic pipe joints, etc.). [Background technology]

[0002] When connecting plastic pipes using pipe joints, it is necessary to cut the outer circumferential surface of the plastic pipe to remove the oxide film on the outer circumferential surface in order to prevent poor connection.Patent Document 1 describes a cutting tool in which a support frame supporting a cutting tool is configured to be rotatable while moving in the axial direction of the plastic pipe, and the support frame moves and rotates with the cutting tool pressed against the outer circumferential surface of the plastic pipe, thereby cutting the outer circumferential surface of the plastic pipe.

[0003] However, when cutting the outer surface of a plastic pipe using the cutting tool described in Patent Document 1, tasks such as marking the plastic pipe are required to check the amount of cutting (cutting length), which poses the problem of a heavy cutting operation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] DE 102007046631 A1 Summary of the Invention [Problem to be solved by the invention]

[0005] One aspect of the present disclosure has been made in consideration of the above-described circumstances, and the problem it aims to solve is to provide a cutting tool, a cutting method, and a construction method that can reduce the burden of cutting work. [Means for solving the problem]

[0006] The problem to be solved by one embodiment of the present disclosure has been described above. Next, the means for solving this problem will be described.

[0007] In one aspect of the present disclosure, the cutting tool comprises a support part that supports a bit capable of cutting the outer surface of a plastic pipe, a feed screw attached to the support part, a pipe fixing part that can be fixed to the plastic pipe and into which the feed screw is screwed, and a regulating part that can be positioned between the support part and the pipe fixing part and that regulates the approach of the support part and the pipe fixing part. According to one aspect of the present disclosure, the burden of cutting work can be reduced. In other words, since the need for work such as marking the plastic pipe to check the cutting amount (cutting length) is eliminated, the burden of the cutting work can be reduced.

[0008] In one aspect of the present disclosure, the regulating portion can be fitted onto the feed screw from outside. According to one aspect of the present disclosure, the restricting portion can be configured simply.

[0009] In one aspect of the present disclosure, the restricting portion can be disposed so as to be rotatable relative to the feed screw. According to one aspect of the present disclosure, it is possible to prevent the restricting portion from interfering with the cutting operation.

[0010] In one aspect of the present disclosure, the regulating portion includes a slit portion formed along a longitudinal direction of the feed screw. According to one aspect of the present disclosure, the restricting portion can be configured simply.

[0011] In one aspect of the present disclosure, the restriction portion is configured to be able to change an opening width of the slit portion. According to one aspect of the present disclosure, the regulating portion can be easily attached to the feed screw by changing the opening width of the slit portion according to the diameter of the feed screw.

[0012] In one aspect of the present disclosure, the restricting portion is formed such that an opening width of the slit portion is greater than or equal to ⅕ and less than or equal to ½ of the entire circumference of the restricting portion. According to one aspect of the present disclosure, the restricting portion can be easily attached to the feed screw.

[0013] In one aspect of the present disclosure, the regulating portion includes a plurality of pieces formed to have the same length in a direction along the longitudinal direction of the feed screw. According to one aspect of the present disclosure, by attaching a number of pieces corresponding to the cutting length, the approach of the support portion and the pipe fixing portion can be easily restricted at a desired position.

[0014] In one aspect of the present disclosure, the restricting portion includes a plurality of restricting portions formed to have different lengths in a direction along a longitudinal direction of the feed screw. According to one aspect of the present disclosure, by attaching a regulating portion according to the cutting length, the approach of the support portion and the pipe fixing portion can be easily regulated at a desired position.

[0015] In one aspect of the present disclosure, the plurality of restriction portions are decorated with different designs. According to one aspect of the present disclosure, the restriction portion can be identified by the decoration, thereby preventing installation errors.

[0016] In one aspect of the present disclosure, the feed screw is decorated with a decoration corresponding to the regulating portion. According to one aspect of the present disclosure, by comparing the restricting portion with the decoration on the feed screw, installation errors can be prevented.

[0017] In one aspect of the present disclosure, the regulating portion is provided so as to be movable toward and away from the support portion toward the pipe fixing portion. According to one aspect of the present disclosure, the approach of the support portion and the pipe fixing portion can be easily restricted at a desired position.

[0018] In one aspect of the present disclosure, the restriction portion is made of resin. According to one aspect of the present disclosure, it is possible to prevent damage to the cutting tool body (support part, feed screw, pipe fixing part). Specifically, when the restricting part is tightly pinched between the support part and the pipe fixing part, the restricting part made of resin is preferentially damaged, thereby preventing damage to other parts.

[0019] In one aspect of the present disclosure, the cutting tool according to claim 1 is used to cut an outer peripheral surface of a plastic pipe. According to one aspect of the present disclosure, the burden of cutting work can be reduced. In other words, since the need for work such as marking the plastic pipe to check the cutting amount (cutting length) is eliminated, the burden of the cutting work can be reduced.

[0020] One aspect of the present disclosure is a method for performing electric fusion joining to join a plastic pipe and a pipe fitting, which includes using a cutting tool as described in claim 1 to cut the outer surface of the plastic pipe, inserting the plastic pipe into the pipe fitting having an embedded heating wire, and generating heat from the heating wire to heat and melt the resin on the inner surface of the pipe fitting and the outer surface of the plastic pipe, thereby fusing them together. According to one aspect of the present disclosure, the burden of cutting work can be reduced. Effect of the Invention

[0021] According to one aspect of the present disclosure, the burden of cutting work can be reduced. [Brief description of the drawings]

[0022] [Figure 1] 1 is a left side cross-sectional view showing a joining portion of a plastic pipe and a pipe joint that is the subject of a cutting method and a construction method according to a first embodiment of the present disclosure. [Diagram 2] FIG. 1 is a left side view showing a cutting tool according to a first embodiment of the present disclosure. [Diagram 3] 1A is a left side view showing a restricting member of a cutting tool, and FIG. [Figure 4] FIG. 11 is a left side view showing a feed screw of a cutting tool according to a second embodiment and a regulating portion prepared for attachment to the feed screw. [Diagram 5] FIG. 13 is a front view showing a restricting portion of a cutting tool according to a third embodiment. [Figure 6] FIG. 13 is a left side view showing a cutting tool according to a fourth embodiment. [Figure 7] FIG. 13 is a left side view showing a part of a cutting tool according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In the following description, the directions indicated by arrows U, D, F, B, L and R in the figures are defined as upward, downward, forward, backward, leftward and rightward, respectively.

[0024] A cutting tool 1 according to a first embodiment of the present invention will be described below.

[0025] The cutting tool 1 is a cutting tool for cutting the outer peripheral surface of a plastic pipe (various tubular plastic members such as plastic piping, plastic pipe joints, etc.). In this embodiment, an example is shown in which the cutting tool 1 is used to cut the outer peripheral surface of a plastic pipe 2 when a plastic pipe 2 and a pipe joint 3 are joined by electric fusion bonding (hereinafter referred to as "EF joining"). Before describing the cutting tool 1, EF joining will be described below with reference to FIG. 1.

[0026] EF joining is a joining method in which a plastic pipe 2 and a pipe fitting 3 are integrated by thermally fusing them together. The plastic pipe 2 and the pipe fitting 3 are made of thermoplastic resin, such as polyvinyl chloride or polyethylene. The diameters of the plastic pipe 2 and the pipe fitting 3 are not limited, and they may be small or large. An electric heating wire 3a is embedded near the joining surface (inner peripheral surface) of the pipe fitting 3.

[0027] First, in order to prevent defects from occurring during joining, before the plastic pipe 2 is set in the pipe fitting 3, the joining portion of the outer circumferential surface of the plastic pipe 2 is cut to remove the oxide film on the outer circumferential surface of the plastic pipe 2. In this embodiment, using a cutting tool 1, the outer circumferential surface of the plastic pipe 2 is cut to a position a predetermined length away from the end (for example, length L shown in the enlarged view of FIG. 1).

[0028] Next, the two plastic pipes 2 with their outer circumferential surfaces cut are inserted (set) inside the pipe joint 3, and then electricity is applied from a controller (not shown) to heat the heating wire 3a. This heats and melts the resin on the inner circumferential surface of the pipe joint 3 and the outer circumferential surface of the plastic pipe 2, thereby fusing them together. After fusing, the plastic pipes 2 and the pipe joint 3 are cooled, allowing the plastic pipes 2 and the pipe joint 3 to be joined together.

[0029] Here, the extent to which the outer peripheral surface of the plastic pipe 2 is cut (the cutting length in the axial direction of the plastic pipe 2) is determined by the nominal diameter, etc., of the plastic pipe 2. For this reason, conventionally, the position to be cut on the outer peripheral surface of the plastic pipe 2 is marked with a marker or the like, and cutting is performed using the marking as the target.

[0030] On the other hand, in this embodiment, the outer circumferential surface of the plastic pipe 2 is cut using the cutting tool 1, which makes it possible to eliminate the need for marking on the outer circumferential surface of the plastic pipe 2. The configuration of the cutting tool 1 will be described below with reference to Figures 2 and 3. Note that the drawings used in the description in this specification are schematic diagrams, and do not particularly limit the detailed shapes, configurations, etc. of each part.

[0031] As described above, the cutting tool 1 is a scraper for cutting the outer peripheral surface of the plastic pipe 2 when EF joining the plastic pipe 2 and the pipe fitting 3. The cutting tool 1 includes a cutting tool 10, a support part 20, a feed screw 30, a wing nut 40, a pipe fixing part 50, and a regulating part 100. The support part 20 is rotatable about the axis of the feed screw 30, and FIG. 2 shows a state in which the arm 21 of the support part 20 is positioned above the feed screw 30.

[0032] The cutting tool 10 is used to cut the outer peripheral surface of the plastic pipe 2. The cutting tool 10 is provided so as to be located radially outside a feed screw 30, which will be described later. The cutting tool 10 is formed so as to be able to cut the outer peripheral surface of the plastic pipe 2 by rotating while being pressed against the outer peripheral surface of the plastic pipe 2.

[0033] The support portion 20 supports the tool 10 and has a feed screw 30 attached thereto, which will be described later. The support portion 20 includes an arm 21 and a frame 22.

[0034] The arm 21 is a portion that supports the tool bit 10. The arm 21 is provided with its longitudinal direction directed in the front-rear direction, and supports the tool bit 10 at its front end.

[0035] The frame 22 is a portion to which the feed screw 30 is attached. The frame 22 is formed so as to extend radially inward (downward in FIG. 2) from the rear end of the arm 21 with the axis of the feed screw 30 as the reference.

[0036] The feed screw 30 rotates and advances the tool bit 10. The feed screw 30 is formed in a generally round bar shape. The feed screw 30 is provided so that its axis faces the front-rear direction and penetrates the frame 22 from front to rear. The feed screw 30 includes a male thread portion 31, a small diameter portion 32, a shaft portion 33, and a drill connecting portion 34.

[0037] The male thread portion 31 is formed from the middle portion to the front end of the feed screw 30. The male thread portion 31 is formed forward of the frame 22. The male thread portion 31 is screwed into a female thread portion of a cylindrical body 51, which will be described later.

[0038] The thin diameter portion 32 is a portion provided on the rear side of the male thread portion 31. The thin diameter portion 32 is formed to have an outer diameter smaller than that of the male thread portion 31.

[0039] The shaft portion 33 is a portion provided on the rear side of the thin diameter portion 32. The shaft portion 33 is formed to have an outer diameter larger than that of the thin diameter portion 32. The shaft portion 33 is inserted into the lower part of the frame 22. A male threaded portion (not shown) is formed at the rear of the shaft portion 33, and a wing nut 40 (described later) is screwed into the male threaded portion. A washer 33a is fixed to the shaft portion 33 at a portion forward of the frame 22.

[0040] The drill connecting portion 34 is a portion provided on the rear side of the shaft portion 33, and is a portion to which an electric drill is connected for rotating the feed screw 30. The drill connecting portion 34 is provided so as to protrude rearward beyond the frame 22.

[0041] The wing nut 40 is for fixing the feed screw 30 to the support part 20. The wing nut 40 has a female threaded part (not shown) formed on its inner peripheral surface. The wing nut 40 is screwed onto a male threaded part (not shown) of the shaft part 33 from the rear of the frame 22. In this way, the frame 22 is sandwiched between the wing nut 40 and the washer 33a, and the feed screw 30 is fixed to the frame 22.

[0042] The feed screw 30 thus configured is provided so that its attachment position in the radial direction (the vertical direction in FIG. 2) relative to the frame 22 can be changed according to the nominal diameter of the resin pipe 2.

[0043] The pipe fixing part 50 fixes the resin pipe 2 which is the target to be cut. The pipe fixing part 50 is provided in front of the feed screw 30. The pipe fixing part 50 includes a cylindrical body 51, a pipe holding plate 52, and an operating part 53.

[0044] The cylindrical body 51 is formed in a cylindrical shape, and its axis is provided in the axial direction (front-rear direction) of the feed screw 30. A female thread portion (not shown) is formed on the inner peripheral surface of the cylindrical body 51, and the male thread portion 31 of the feed screw 30 is screwed into the female thread portion.

[0045] The tube holding plates 52 hold the inner peripheral surface of the plastic pipe 2 to be cut. A plurality of tube holding plates 52 are provided on the outer peripheral side of the cylindrical body 51. The tube holding plates 52 are supported by the cylindrical body 51 so as to be movable in a direction approaching the cylindrical body 51 (radially inward) and in a direction moving away from the cylindrical body 51 (radially outward). The tube holding plates 52 are formed with claw portions 52a.

[0046] The claw portion 52a regulates the insertion length of the tube holding plate 52 into the plastic tube 2. The claw portion 52a is formed so as to protrude from the rear end of the tube holding plate 52 radially outward.

[0047] The operating unit 53 is operated when the tube holding plate 52 is operated. The operating unit 53 is provided at the rear of the cylindrical body 51 so as to be rotatable around the axis of the cylindrical body 51. The operating unit 53 is connected to the tube holding plate 52 via an appropriate mechanism and is configured to be able to move the tube holding plate 52. More specifically, the operating unit 53 is formed so as to be able to move the tube holding plate 52 radially inward (reducing the diameter of the tube fixing part 50) by rotating to one side, and to be able to move the tube holding plate 52 radially outward (expanding the diameter of the tube fixing part 50) by rotating to the other side.

[0048] The cutting tool 1 can be fixed to the plastic pipe 2 by the pipe fixing part 50 configured in this manner. Specifically, the pipe holding plate 52 is inserted into the inside of the plastic pipe 2, and the operation part 53 is rotated to move the pipe holding plate 52 radially outward, whereby the inner peripheral surface of the plastic pipe 2 can be held by the pipe holding plate 52. In this manner, the cutting tool 1 can be fixed to the plastic pipe 2.

[0049] The restricting portion 100 is disposed between the frame 22 of the support portion 20 and the pipe fixing portion 50, and restricts the approach between the support portion 20 and the pipe fixing portion 50. More specifically, the restricting portion 100 restricts the forward movement of the feed screw 30 so that the cutting tool 10 does not cut the outer peripheral surface of the plastic pipe 2 more than necessary.

[0050] The restricting portion 100 is made of resin. As shown in Fig. 3, the restricting portion 100 is formed in a cylindrical shape with a portion open. More specifically, the restricting portion 100 is formed with a slit portion 101 along the axial direction.

[0051] The slit portion 101 is formed so as to penetrate the outer peripheral surface and the inner peripheral surface of the regulating portion 100. The slit portion 101 is formed so as to extend from one axial end of the regulating portion 100 to the other axial end. The regulating portion 100 is formed so as to have elasticity. The opening width b of the regulating portion 100 (the circumferential length of the slit portion 101, see FIG. 3(b)) is formed to be large enough to fit the feed screw 30 from the outside through the slit portion 101 and to be removable from the feed screw 30. Specifically, the opening width b of the slit portion 101 is formed to be 1 / 5 or more and 1 / 2 or less of the entire circumference (circumferential length) of the regulating portion 100.

[0052] The restricting portion 100 thus formed is fitted from the outside to the feed screw 30 via the slit portion 101 with its axis facing the front-rear direction. The restricting portion 100 is loosely fitted to the feed screw 30 so as to be rotatable relative to the feed screw 30 (so as not to rotate together with the feed screw 30).

[0053] A method for cutting the outer peripheral surface of the plastic pipe 2 using the cutting tool 1 will be described below.

[0054] First, the pipe fixing part 50 is inserted into the inside of the plastic pipe 2 until the claw parts 52a of the pipe holding plate 52 abut against the end face of the plastic pipe 2. Then, the operating part 53 is rotated to move the pipe holding plate 52 radially outward, whereby the inner peripheral surface of the plastic pipe 2 is held by the pipe holding plate 52. In this manner, the cutting tool 1 can be fixed to the plastic pipe 2.

[0055] Next, a drill chuck of an electric drill (not shown) is connected to the drill connecting portion 34, and the electric drill is operated. When the electric drill is operated, the feed screw 30 rotates. Here, the feed screw 30 is screwed into the female thread portion of the cylindrical body 51. Therefore, as the feed screw 30 rotates, it moves forward (advances) so as to approach the pipe fixing portion 50 and the plastic pipe 2 fixed to the pipe fixing portion 50.

[0056] As the feed screw 30 advances and rotates, the support part 20 that supports the feed screw 30 also advances and rotates about the axis of the feed screw 30. As a result, the cutting tool 10 provided at the front end of the support part 20 rotates while being pressed against the outer circumferential surface of the plastic pipe 2 approaching the support part 20. In this way, the outer circumferential surface of the plastic pipe 2 can be cut.

[0057] Then, when the outer circumferential surface of the plastic pipe 2 is cut by the cutting tool 10 to a position a specified length away from the end, the front end of the restricting part 100 abuts against the operating part 53, and the frame 22 abuts against the rear end of the restricting part 100. In this way, the restricting part 100 is sandwiched between the frame 22 and the operating part 53, thereby restricting the forward movement of the feed screw 30.

[0058] In this way, the restricting portion 100 restricts the approach of the support portion 20 that supports the tool tool 10 to the pipe fixing portion 50 and the plastic pipe 2 fixed to the pipe fixing portion 50. This makes it possible to prevent the tool tool 10 from cutting the outer circumferential surface of the plastic pipe 2 beyond the specified cutting length.

[0059] Here, the cutting length of the plastic pipe 2 is specified according to the type (application) and nominal diameter of the plastic pipe 2. For this reason, a plurality of restricting parts 100 (e.g., restricting parts 100a, 100b shown in FIG. 1) each having a different length (total length) in the longitudinal direction of the feed screw 30 are prepared, and the restricting part 100 having a length corresponding to the nominal diameter of the plastic pipe 2 to be cut is attached to the feed screw 30.

[0060] Moreover, the regulating part 100 is arranged so as to be rotatable relative to the feed screw 30. More specifically, the regulating part 100 is loosely fitted to the feed screw 30 so as not to rotate together with the feed screw 30 when the feed screw 30 rotates. Therefore, the regulating part 100 does not rotate together with the feed screw 30 when it abuts against the frame 22 and the operation part 53. Therefore, it is possible to prevent the regulating part 100, the frame 22, or the operation part 53 from being damaged by the rotation of the regulating part 100.

[0061] In addition, when cutting the outer circumferential surface of the plastic pipe 2 using a conventional cutting tool, the markings on the plastic pipe 2 are hidden by the cutting tool and are difficult to see, so the operator must look at the markings from above. On the other hand, when cutting the outer circumferential surface of the plastic pipe 2 using the cutting tool 1 according to this embodiment, the restricting part 100 is located in a position that is easily visible to the operator, so the operator can easily check the cutting length while performing the cutting work. In addition, when the specified cutting length is cut, the restricting part 100 rotates freely at the point where it abuts against the frame 22 and the operating part 53, so it is easy to determine whether the specified cutting length has been cut. Therefore, the specified cutting length can be reliably cut.

[0062] Furthermore, since the restricting portion 100 is attached to the feed screw 30, the cutting tool 1 can be configured compactly.

[0063] In addition, the restricting portion 100 is made of resin. Therefore, if the restricting portion 100 is pinched tightly between the frame 22 and the pipe fixing portion 50 due to excessive rotation of the feed screw 30, the restricting portion 100 made of resin is damaged first, thereby preventing damage to other portions.

[0064] As described above, the cutting tool 1 according to this embodiment has the following features: A support portion 20 for supporting a cutting tool 10 capable of cutting the outer peripheral surface of the resin pipe 2; A feed screw 30 attached to the support portion 20; a pipe fixing portion 50 that can be fixed to the resin pipe 2 and into which the feed screw 30 is screwed; a restricting portion (100) that can be disposed between the support portion (20) and the pipe fixing portion (50) and restricts the support portion (20) and the pipe fixing portion (50) from approaching each other; It is equipped with the following.

[0065] By configuring in this way, the burden of the cutting work can be reduced. That is, since the work of marking the resin pipe 2 for checking the cutting amount (cutting length) is not required, the burden of the cutting work can be reduced.

[0066] In addition, the restricting portion 100 is It is possible to fit onto the feed screw 30 from the outside.

[0067] By configuring in this way, the restriction portion 100 can be simply configured.

[0068] In addition, the restricting portion 100 is It can be disposed so as to be rotatable relative to the feed screw 30 .

[0069] By configuring in this manner, it is possible to prevent the restriction portion 100 from interfering with the cutting operation.

[0070] In addition, the restricting portion 100 is The feed screw 30 is provided with a slit portion 101 formed along the longitudinal direction thereof.

[0071] By configuring in this way, the restriction portion 100 can be simply configured.

[0072] In addition, the restricting portion 100 is The opening width b of the slit portion 101 is formed to be equal to or larger than 1 / 5 and equal to or smaller than 1 / 2 of the entire circumference of the restriction portion 100.

[0073] With this configuration, the restriction portion 100 can be easily attached to the feed screw 30.

[0074] In addition, the restricting portion 100 is The feed screw 30 includes a plurality of restricting portions 100 (for example, restricting portions 100a, 100b) formed to have different lengths in the longitudinal direction of the feed screw 30.

[0075] With this configuration, by attaching the restricting portion 100 (100a, 100b) according to the cutting length, the approach between the support portion 20 and the pipe fixing portion 50 can be easily restricted at a desired position.

[0076] In addition, the restricting portion 100 is It is formed from resin.

[0077] This configuration makes it possible to prevent damage to the cutting tool 1 body (support part 20, feed screw 30, pipe fixing part 50). Specifically, when the restricting part 100 is tightly pinched between the support part 20 and the pipe fixing part 50, the restricting part 100 made of resin is preferentially damaged, thereby making it possible to prevent damage to other parts.

[0078] In addition, the cutting method according to this embodiment includes the steps of: The outer peripheral surface of a plastic pipe 2 is cut using a cutting tool 1 .

[0079] By configuring in this way, the burden of the cutting work can be reduced. Specifically, since the work of marking the resin pipe 2 for checking the cutting amount (cutting length) is not required, the burden of the cutting work can be reduced.

[0080] In addition, the construction method according to this embodiment is as follows: A method for electric fusion joining of a resin pipe 2 and a pipe joint 3, comprising the steps of: The outer circumferential surface of the resin pipe 2 is cut using a cutting tool 1, The plastic pipe 2 is inserted into the pipe fitting 3 having an electric heating wire 3a embedded therein, and the electric heating wire 3a is heated to heat the resin on the inner surface of the pipe fitting 3 and the outer surface of the plastic pipe 2, thereby melting and fusing them together.

[0081] With this configuration, the burden of the cutting operation can be reduced, and further, the burden of the joining operation for joining the resin pipe 2 and the pipe joint 3 can be reduced.

[0082] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0083] For example, in the first embodiment, the restriction portion 100 is made of resin, but the material of the restriction portion 100 is not limited to this and may be any material, such as metal.

[0084] Furthermore, in the first embodiment, the restricting portion 100 restricts the approach between the support portion 20 and the tube fixing portion 50 by abutting (being sandwiched) between the frame 22 and the operation portion 53, but it may also restrict the approach between the support portion 20 and the tube fixing portion 50 by abutting against another member. For example, if a buffer member (e.g., a rubber bellows, etc.) for buffering a collision between the frame 22 of the support portion 20 and the operation portion 53 is provided behind the operation portion 53, the restricting portion 100 may restrict the approach between the support portion 20 and the tube fixing portion 50 by abutting against the frame 22 and the buffer member.

[0085] Furthermore, the resin pipe 2 and the pipe joint 3 are not limited to those made of thermoplastic resin such as polyvinyl chloride or polyethylene, and may be made of other resins.

[0086] Furthermore, in order to prevent mistakes in attaching the restriction parts 100, restriction parts 100 having different overall lengths (for example, restriction parts 100a, 100b shown in FIG. 1) may be decorated differently from each other. For example, each restriction part 100 may be colored in a different color, or each restriction part 100 may have a different symbol, pattern, character string, or the like.

[0087] As described above, the plurality of restriction portions 100 include: They are decorated differently from each other.

[0088] With this configuration, the restriction portion 100 can be identified by the decoration, and therefore, incorrect installation can be prevented.

[0089] Furthermore, the feed screw 30 may be decorated to match the regulating part 100 in order to prevent the regulating part 100 from being attached incorrectly. For example, the feed screw 30 may be colored in different colors at predetermined intervals along the axial direction. Specific examples of this will be described below.

[0090] A cutting tool 1A according to a second embodiment of the present invention will be described below with reference to Fig. 4. In the following, the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

[0091] In the cutting tool 1A according to the second embodiment, regulating portions 100 (regulating portions 100c, 100d, 100e) each having a different overall length are prepared, and the male thread portion 31 of the feed screw 30 is colored according to the coloring of each regulating portion 100.

[0092] Specifically, the male thread portion 31 is divided into a plurality of regions (first region 31c, second region 31d, third region 31e) according to the overall length of the regulating portion 100 (regulating portions 100c, 100d, 100e). The first region 31c is colored the same as the regulating portion 100c, the second region 31d is colored the same as the regulating portion 100d, and the third region 31e is colored the same as the regulating portion 100e. The boundary between the first region 31c and the second region 31d is located slightly forward of the front end of the regulating portion 100c when the rear end of the regulating portion 100c is aligned with the rear end of the male thread portion 31 and attached. The boundary between the second region 31d and the third region 31e is located slightly forward of the front end of the regulating portion 100d when the rear end of the regulating portion 100d is aligned with the rear end of the male thread portion 31 and attached. In addition, the front end of the third region 31e is located slightly forward of the front end of the restricting portion 100e when the rear end of the restricting portion 100e is aligned with the rear end of the male thread portion 31 and attached. This makes it possible to confirm that the restricting portion 100 corresponds to the nominal diameter of the plastic pipe 2 by using the color of the feed screw 30 at the location overlapping with the front end of the restricting portion 100 as a guide.

[0093] As described above, in the cutting tool 1A according to the second embodiment, The feed screw 30 has The restriction portion 100 is decorated to match the restriction portion 100.

[0094] With this configuration, it is possible to prevent installation errors by comparing the regulating portion 100 with the decoration on the feed screw 30. Note that the decoration is not limited to coloring, and different symbols, patterns, character strings, etc. may be applied to each region (first region 31c, second region 31d, third region 31e) of the male thread portion 31.

[0095] In the first embodiment, the regulating portion 100 is configured to be detachable from the feed screw 30 by forming the slit portion 101, but it may be formed in a clip shape and configured to change the opening width b of the slit portion 101. A specific example will be described below.

[0096] A cutting tool 1B according to a third embodiment of the present invention will be described below with reference to Fig. 5. In the following, the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

[0097] The cutting tool 1B according to the third embodiment includes a regulating part 100B instead of the regulating part 100. The regulating part 100B is divided into a first member 102 and a second member 103, and the first member 102 and the second member 103 are formed to be rotatable around a rotation axis 104. The regulating part 100B is configured to be able to expand and reduce the opening width b of the slit part 101 by rotating the first member 102 and the second member 103 around the rotation axis 104. In addition, the first member 102 and the second member 103 may be biased in a direction in which the slit part 101 is closed by a spring (not shown). This makes it possible to easily attach and detach the regulating part 100 to and from the feed screw 30. In addition, the regulating part 100 can be attached to a feed screw 30 having a different diameter.

[0098] As described above, in the cutting tool 1B according to the third embodiment, The restriction portion 100B is The opening width b of the slit portion 101 is configured to be changeable.

[0099] With this configuration, the opening width b of the slit portion 101 can be changed according to the diameter of the feed screw 30, so that the restricting portion 100 can be easily attached to the feed screw 30.

[0100] In the first embodiment, the regulating portion 100 is attached to the feed screw 30, but the attachment location of the regulating portion 100 is not limited to this. Specific examples will be described below.

[0101] A cutting tool 1C according to a fourth embodiment of the present invention will be described below with reference to Fig. 6. In the following, the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

[0102] A cutting tool 1C according to the fourth embodiment includes a restriction portion 100C instead of the restriction portion 100.

[0103] The restricting portion 100C is formed in a rod shape and is attached to the frame 22 of the support portion 20 with its longitudinal direction facing the axial direction of the feed screw 30. The restricting portion 100C is provided so as to protrude forward and backward from the frame 22.

[0104] The restricting portion 100C is provided on the frame 22 so as to be movable forward and backward with respect to the frame 22 and so as to be fixable at a predetermined forward and backward position. As a result, the restricting portion 100C is provided on the support portion 20 so as to be movable toward and away from the pipe fixing portion 50.

[0105] When the support part 20 and the pipe fixing part 50 approach each other while the cutting tool 10 is cutting the outer circumferential surface of the plastic pipe 2, the front end of the restricting part 100C provided on the support part 20 comes into contact with the operating part 53. The restricting part 100C comes into contact with the operating part 53, thereby restricting the forward movement of the feed screw 30 and the support part 20. This makes it possible to limit the cutting length of the outer circumferential surface of the plastic pipe 2 to a specified cutting length.

[0106] Here, since the restricting part 100C can be advanced and retreated toward the pipe fixing part 50, the length of its forward projection from the frame 22 can be adjusted, and thus the approach between the support part 20 and the pipe fixing part 50 can be easily restricted at a desired position. Therefore, the front-rear position of the restricting part 100C can be adjusted according to the nominal diameter of the plastic pipe 2. Therefore, the outer circumferential surfaces of plastic pipes 2 with different nominal diameters can be cut with one restricting part 100C without replacing the restricting part 100C.

[0107] As described above, in the cutting tool 1C according to the fourth embodiment, The restriction portion 100C is The support portion 20 is provided so as to be capable of advancing and retreating toward the pipe fixing portion 50.

[0108] With this configuration, the approach between the support part 20 and the pipe fixing part 50 can be easily restricted at a desired position.

[0109] A cutting tool 1D according to a fifth embodiment of the present invention will be described below with reference to Fig. 7. In the following, the same components as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

[0110] The cutting tool 1D according to the fifth embodiment includes a regulating portion 100D instead of the regulating portion 100. The regulating portion 100D is formed in a cylindrical shape with a slit portion 101 formed therein, similar to the regulating portion 100 according to the first embodiment. The regulating portion 100D includes a plurality of pieces 105. That is, the regulating portion 100D is divided into a plurality of pieces 105. The plurality of pieces 105 are formed so as to have the same length in the direction along the longitudinal direction of the feed screw 30 (front-rear direction).

[0111] In the fifth embodiment, the number of pieces 105 can be changed according to the nominal diameter of the plastic pipe 2. By changing the number of pieces 105, the overall length of the restricting portion 100D in the front-rear direction can be adjusted. By adjusting the overall length of the restricting portion 100D, it is possible to adjust the distance in the front-rear direction between the frame 22 and the operating portion 53 when the outer circumferential surface of the plastic pipe 2 is cut by the cutting tool 10 to a position a specified length away from the end (when the restricting portion 100D abuts against the frame 22 and the operating portion 53), and thus the cutting length of the plastic pipe 2 can be adjusted.

[0112] As described above, in the cutting tool 1D according to the fifth embodiment, The restriction portion 100D is The feed screw 30 is provided with a plurality of pieces 105 formed so as to have the same length in the longitudinal direction thereof.

[0113] With this configuration, by attaching pieces 105 in a number corresponding to the cutting length, the approach between support part 20 and pipe fixing part 50 can be easily restricted at a desired position.

[0114] In the above embodiment, the outer circumferential surface of the plastic pipe is cut from the end, but the present invention is not limited to this. It is also possible to use a restricting portion to align the cutting tool to a desired cutting length, and then cut in the opposite direction (to the end of the plastic pipe). [Explanation of symbols]

[0115] 1, 1A, 1B, 1C, 1D cutting tools 2 Plastic pipe 3 Pipe Fittings 10 bytes 20 Support part 30 Lead screw 50 Pipe fixing part 100, 100A, 100B, 100C, 100D Regulatory section 101 Slit section 105 pieces

Claims

1. a support portion for supporting a cutting tool capable of cutting an outer peripheral surface of a resin pipe; A feed screw attached to the support portion; a pipe fixing portion that can be fixed to the resin pipe and into which the feed screw is screwed; a restricting portion that can be disposed between the support portion and the pipe fixing portion and restricts the support portion from approaching the pipe fixing portion; A cutting tool comprising:

2. The regulating portion is It is possible to fit the lead screw from the outside. The cutting tool according to claim 1.

3. The regulating portion is The lead screw may be arranged to be rotatable relative to the lead screw. The cutting tool according to claim 2.

4. The regulating portion is The feed screw has a slit formed along a longitudinal direction thereof. The cutting tool according to claim 2.

5. The regulating portion is The opening width of the slit portion is configured to be changeable.

5. The cutting tool according to claim 4.

6. The regulating portion is The opening width of the slit portion is formed to be 1 / 5 or more and 1 / 2 or less of the entire circumference of the restricting portion.

5. The cutting tool according to claim 4.

7. The regulating portion is The feed screw includes a plurality of pieces formed to have the same length in a longitudinal direction of the feed screw. The cutting tool according to claim 1.

8. The regulating portion is The feed screw includes a plurality of restricting portions formed to have different lengths in a longitudinal direction of the feed screw. The cutting tool according to claim 1.

9. The plurality of restriction portions include: Each one is decorated differently, 9. The cutting tool according to claim 8.

10. The feed screw has: A decoration corresponding to the restriction portion is applied. The cutting tool according to claim 1.

11. The regulating portion is The support portion is provided so as to be movable toward and away from the pipe fixing portion. The cutting tool according to claim 1.

12. The regulating portion is It is formed of resin, A cutting tool according to any one of claims 1 to 11.

13. A cutting method for cutting an outer peripheral surface of a plastic pipe by using the cutting tool according to claim 1.

14. A method for performing electric fusion joining for joining a plastic pipe and a pipe joint, comprising the steps of: The cutting tool according to claim 1 is used to cut the outer circumferential surface of the resin pipe, This construction method involves inserting the plastic pipe into the pipe joint with an embedded heating wire, and generating heat from the heating wire to heat, melt, and fuse the resin on the inner surface of the pipe joint and the outer surface of the plastic pipe.

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