JP2015073642A - Cutting tool for protective pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool for a protective pipe which can smoothly carry out cutting work.SOLUTION: A cutting tool 3 cuts a protective pipe 2 having an approximate oval cross section, and includes a tool main body 4, first and second blade parts 5a, 6a, and a cover body 7. The tool main body 4 includes a through part 4a, and an opening part 4b for putting the protective pipe 2 in and out from the through part 4a. The first blade part 5a projects to the opening part 4b, and cuts a first peripheral wall 2a of the protective pipe 2 passing through the opening part 4b on a side of a smaller width direction P1 of the approximate oval cross section. The second blade part 6a projects to the through part 4a, and cuts a second peripheral wall 2b of the protective pipe 2 penetrating the through part 4a and relatively rotating to the tool main body 4 on a side of a larger width direction P2 of the approximate oval cross section. The cover body 7 can move over a first moving region projecting to a center side of the through part 4a from the second blade part 6a and a second moving region exposing the second blade part 6a to the center side of the through part 4a.

Description

  The present invention relates to a cutting tool for a protective tube that cuts a protective tube having a substantially oval cross section.

  Conventionally, there has been a cutting tool for cutting a corrugated tube having a substantially oval cross section (see, for example, Patent Document 1). As shown in FIG. 16, the cutting tool 21 was provided with a cutter body 22 having a C-shaped enlarged head 22a. The enlarged head portion 22a of the cutter body 22 has an inner space serving as a receiving hole 23 in which the corrugated tube 20 is received, and between opposite ends, an insertion port 24 for inserting the corrugated tube 20 into the receiving hole 23 is provided. It was. The insertion opening 24 is provided with a first cutting edge 25, and the receiving hole 23 is provided with a straight second cutting edge 26. Therefore, the corrugated tube 20 is passed through the insertion port 24, whereby both side walls 20 a and 20 a of the corrugated tube 20 are cut by the first cutting edge 25. Then, by turning the cutting tool 21 with respect to the corrugated tube 20 received in the receiving hole 23, both end curved walls 20 b and 20 b of the corrugated tube 20 were cut by the second cutting blade 26.

Japanese Patent Laid-Open No. 10-328440

  By the way, in the said conventional cutting tool 21, the 2nd cutting blade 26 (2nd blade part) was exposed largely inside the expansion head 22a. For this reason, the operator needs to pay attention to the exposed second cutting edge 26 to cut the corrugated tube 20 (protective tube), which is troublesome.

  The present invention has been made in order to solve the above-described conventional drawbacks, and the object of the present invention is to protect the second cutting portion without paying attention and to facilitate the cutting operation. It is to provide a cutting tool for a pipe.

The cutting tool for a protective tube according to the present invention has the following configuration in order to achieve the object. That is,
A cutting tool for a protective tube according to the first aspect of the present invention is a cutting tool for cutting a protective tube having a substantially oval cross section. The cutting tool includes a tool body, a first blade body and a second blade body that are fixed to the tool body, and a cover body. Here, the tool main body has a penetrating portion through which the protective tube can penetrate, and an opening through which the protective tube can be taken in and out from the side in the wide direction having a substantially oval cross section. The first blade portion, which is the blade portion of the first blade body, protrudes into the opening, and the protective tube passes through the opening so that the protective tube has a substantially oval cross-sectional side in the narrow direction. The 1st surrounding wall in is cut | disconnected. The second blade portion, which is the blade portion of the second blade body, protrudes into the penetrating portion, and the protection tube passing through the penetrating portion rotates relative to the tool body to protect the second blade portion. A second peripheral wall on the side of the tube having a substantially oval cross section in the wide direction is cut. Further, the cover body is provided in the penetrating portion and is movable along a plane perpendicular to the axial direction of the penetrating portion, and by the movement, the cover body is more than the second blade portion. A first movement region projecting toward the center side of the penetrating portion; and a second region exposing the second blade portion to the center side of the penetrating portion without projecting toward the center side of the penetrating portion than the second blade portion. Move across the moving area. And the said cover body has an in / out position which enables the said protective tube to be withdrawn / inserted with respect to the said penetration part through the said opening part in the said 1st movement area.

  According to this cutting tool, the tool body has a penetrating part through which the protective tube can penetrate and an opening part through which the protective tube can be taken in and out. Here, a first blade portion that cuts the first peripheral wall on the narrow-width side of the protective tube having a substantially oval cross section protrudes from the opening, and the through tube has a substantially oval cross section of the protective tube. The 2nd blade part which cut | disconnects the 2nd surrounding wall in the width direction side of a shape protrudes. The cutting tool includes a cover body in the penetrating portion, and the cover body moves along a plane perpendicular to the axial direction of the penetrating portion so that it is closer to the center of the penetrating portion than the second blade portion. It moves across the first moving area that protrudes and the second moving area that exposes the second blade part to the center side of the penetrating part without protruding to the center side of the penetrating part rather than the second blade part. Therefore, in order to cut the protective tube with this cutting tool, the cover body is placed in the first moving zone in and out, and the protective tube penetrates through the opening from the wide side of the substantially oval cross section. Advance the cutting tool to enter the part. At this time, the first peripheral wall on the narrow-width side of the protective tube having a substantially oval cross section is cut by the first blade portion protruding from the opening. Next, the cutting tool is rotated so that the protective tube rotates relative to the tool body. As a result, the second peripheral wall on the side of the protective tube having a substantially oval cross-section in the wide direction is cut by the second blade portion protruding from the through portion. Here, the cover body moves to the second movement area by the operator's operation prior to the turning of the cutting tool, or moves to the second movement area in conjunction with the turning of the cutting tool. Next, the rotation position of the cutting tool is determined so that the widthwise side of the protective tube having a substantially oval cross section faces the opening side, and the cutting tool is retracted from the protective tube so that the protective tube can be Can go out through the opening. Here, the cover body moves to the loading / unloading position by the operator's operation after determining the rotation position of the cutting tool, or moves to the loading / unloading position in conjunction with the rotation of the cutting tool. Thus, with this cutting tool, the first peripheral wall on the narrow side and the second peripheral wall on the wide direction side of the protective tube having a substantially oval cross section can be cut. When the protective tube is inserted into the penetrating portion of the tool body or when the protective tube is taken out of the penetrating portion, the cover body is in the first movement area and protrudes toward the center of the penetrating portion from the second blade portion. Therefore, it is not necessary to pay attention to the second blade portion.

  According to a second aspect of the present invention, there is provided a cutting tool for a protective tube according to the first aspect of the present invention, wherein the cover body is rotatable about the axis of the penetrating portion by the tool body. Supported. And the said cover body has an engaging part engaged with the outer periphery of the said protective tube. Therefore, when the tool body is rotated with respect to the protective tube inserted into the through portion from the opening when the cover body is in the loading / unloading position, the engaging portion is placed on the outer periphery of the protective tube. When the cover body is engaged and stays on the protective tube side, the cover body rotates relative to the tool main body and extends over the first movement area and the second movement area. While moving, the second blade section cuts the second peripheral wall of the protective tube in the second movement region. That is, in this cutting tool, the cover body moves across the first movement area and the second movement area in conjunction with the rotation of the tool body, and is exposed in the second movement area. The second peripheral wall of the protective tube is cut by the two blade portions.

  According to a third aspect of the present invention, in the cutting tool for a protective tube according to the second aspect of the present invention, in the cutting tool according to the second aspect, the engaging portion is fitted on both outer sides of the first peripheral wall of the protective tube. And a holding portion for holding the protective tube. According to this cutting tool, rattling of the cutting tool with respect to the protective tube can be suppressed by the holding portion. For this reason, the cutting tool can be accurately rotated in a direction perpendicular to the axis of the protective tube, and the second peripheral wall of the protective tube can be stably cut.

  According to a fourth aspect of the present invention, there is provided a cutting tool for a protective tube according to the third aspect of the present invention, wherein the protective tube is a corrugated tube having a valley formed on the peripheral wall thereof. Therefore, the first blade body and the second blade body cut a mountain portion of the corrugated tube. And the 1st latching | locking part which enters the trough of the said corrugated pipe | tube and prevents the movement of the corrugated pipe | tube in the longitudinal direction is provided in the opening edge of the said opening part. Further, the cover body is provided with a second locking portion that enters the trough of the corrugated pipe and prevents the corrugated pipe from moving in the longitudinal direction. According to this cutting tool, the position of the cutting tool relative to the longitudinal direction of the corrugated tube is determined by the first locking portion and the second locking portion, and the same corrugated tube is used in the first blade body and the second blade body. The mountain part can be cut accurately.

  According to the cutting tool for a protective tube according to the present invention, by providing the cover body that protrudes to the center side of the penetrating portion from the second blade portion, it is not necessary to pay attention to the second blade portion, and the cutting operation can be smoothly performed. Can proceed.

It is a perspective view of a cutting tool of one embodiment of this invention. Similarly, it is a partially exploded perspective view. Similarly, it is an exploded perspective view. Similarly, it is a plan view. Similarly, it is an expanded sectional view by the AA line in FIG. Similarly, it is an expanded sectional view by the BB line in FIG. Similarly, it is the top view which rotated the cover body 90 degrees with respect to the tool main body. Similarly, it is an expanded sectional view by CC line in FIG. Similarly, it is the principal part enlarged plan view which took out the cutter from the cutting tool. Similarly, it is a top view when a cutting tool is advanced and a corrugated pipe passes through an opening. Similarly, it is an expanded sectional view by the DD line in FIG. Similarly, it is a top view when a cutting tool is advanced further and a corrugated pipe is inserted in a penetration part. Similarly, it is an expanded sectional view by the EE line in FIG. Similarly, it is a top view when a cutting tool is rotated 90 degrees clockwise. Similarly, it is an expanded sectional view by the FF line in FIG. It is a top view which shows the conventional cutting tool.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the cutting tool for protection tubes which concerns on this invention is demonstrated based on drawing.

  1 to 15 show an embodiment of the present invention. Reference numeral 1 in the figure indicates wiring / piping material (wiring material or piping material). Reference numeral 2 denotes a protective tube having a substantially oval cross section for accommodating the wiring / piping material 1 therein. 3 shows a cutting tool for cutting the protective tube 2 without cutting the internal wiring / piping material 1.

  The cutting tool 3 includes a tool body 4, a first blade body 5 and a second blade body 6 fixed to the tool body 4, and a cover body 7. Here, the tool body 4 includes a through portion 4a through which the protective tube 2 can penetrate, and an opening 4b through which the protective tube 2 can be taken in and out of the through portion 4a from the side of the wide direction P2 having a substantially oval cross section. Have

  The first blade portion 5a, which is the blade portion of the first blade body 5, protrudes into the opening 4b of the tool body 4, and the protective tube 2 passes through the opening 4b so that the cross section of the protective tube 2 is approximately oval. The first peripheral wall 2a on the narrow width direction P1 side of the shape is cut. And the 2nd blade part 6a which is a blade part of the 2nd blade body 6 protrudes in the penetration part 4a of the tool main body 4, and the protective tube 2 which penetrates the penetration part 4a is relative to the tool main body 4. The second peripheral wall 2b on the side of the width direction P2 having a substantially oval cross section of the protective tube 2 is cut by rotating in the direction of rotation (specifically, rotating around the axis of the through portion 4a). To do.

  The cover body 7 is provided in the penetrating portion 4a, and is movable along a surface perpendicular to the axial direction of the penetrating portion 4a. By the movement, the cover body 7 is more than the second blade portion 6a ( In the illustrated embodiment, the center of the penetrating portion 4a is at least one side surface M of the second blade portion 6a (more specifically, than the second blade portion 6a covering the one side surface M of the second blade portion 6a). The first moving area protruding to the side (see FIGS. 4 and 6) and the second blade portion 6a exposed to the center side of the penetrating portion 4a without protruding to the center side of the penetrating portion 4a than the second blade portion 6a It moves over the 2nd movement area (refer to Drawing 7 and Drawing 8) to be made. And the cover body 7 has an insertion / removal position (refer FIG. 4) which enables the protection tube 2 to be withdrawn / inserted with respect to the penetration part 4a through the opening part 4b in the said 1st movement area.

  Specifically, the cover body 7 is supported by the tool body 4 so as to be rotatable about the axis of the penetrating portion 4a. The cover body 7 has an engaging portion 7 a that engages with the outer periphery of the protective tube 2. Therefore, when the tool body 4 is rotated with respect to the protective tube 2 inserted into the through portion 4a from the opening 4b when the cover body 7 is in the loading / unloading position, the engaging portion 7a is placed on the outer periphery of the protective tube 2. When the cover body 7 is engaged and stays on the protective tube 2 side, the cover body 7 rotates relative to the tool body 4 and extends over the first movement area and the second movement area. And the second blade portion 6a cuts the second peripheral wall 2b of the protective tube 2 in the second movement region. More specifically, the engaging portion 7a is formed on the outer side of both of the first peripheral walls 2a and 2a of the protective tube 2 (in the illustrated embodiment, both of the first peripheral walls 2a and 2a and the second peripheral wall). 2b and 2b) and a holding portion 7b for holding the protective tube 2. Note that the concept of fitting includes not only the case of fitting so as to contact but also the case of fitting in a press fit, or the case of fitting with a slight gap.

  Specifically, the wiring / piping material 1 is a piping material, for example, a piping material for reheating or floor heating, in which two pipes 1a and 1a are juxtaposed, and these pipes 1a and 1a are aluminum laminated films. Or a film 1b such as an aluminum film (see FIG. 4).

  The protective tube 2 is composed of a corrugated tube 201 having a mountain and valley formed on its peripheral wall. Therefore, the first blade body 5 and the second blade body 6 (specifically, the first blade portion 5a and the second blade portion 6a) in the cutting tool 3 cut the crest 2c portion of the corrugated tube 201.

  The tool main body 4 is made of, for example, metal, and includes a main body portion 401 provided with the penetrating portion 4 a and the opening portion 4 b, and a handle portion 402 extending from the main body portion 401. Here, the main body portion 401 is formed in a substantially C shape, and the inside is the through portion 4a, and the end portion is the opening portion 4b. And in the opening part 4b, it enters into the trough 2d of the corrugated pipe 201 at the lip of the opening part 4b (that is, the end part on the open side that is curved in a substantially C shape of the main body part 401). The 1st latching | locking part 4c which prevents the movement of the corrugated pipe | tube 201 in the longitudinal direction is provided. In the illustrated embodiment, the first locking portion 4c is provided at both open end portions of the main body portion 401 that are curved in a substantially C shape, and the first blade body 5 is sandwiched between the end portions. Two are provided.

  The handle 402 is formed to extend from the substantially C-shaped intermediate position of the main body 401 to the opposite side of the opening 4b, and the tool main body 4, that is, the cutting tool 3 is operated by grasping the handle 402. can do. Moreover, the cutter 8 is accommodated in the handle portion 402 so as to be removable. In the illustrated embodiment, the cutter body 8a of the cutter 8 is provided with a shaft hole 8x, and the shaft portion 4d provided in the handle 402 is fitted into the shaft hole 8x. 8 is pivotally supported with respect to the handle 402 and rotates between an accommodation position (see FIG. 4) accommodated in the handle 402 and an extraction position (see FIG. 9) taken out from the handle 402. It is possible.

  The cutter 8 is mainly used for cutting the film 1b in the wiring / piping material 1 (specifically, the piping material). For example, the cutter body 8a made of synthetic resin and the cutter body 8a are used. For example, a metal blade 8b (see FIG. 9). Here, the cutter body 8a has a slit 8c for receiving an object to be cut such as the film 1b at the tip portion. The blade body 8b extends so that the blade portion 8d faces the mouth side of the slit 8c and obliquely intersects the slit 8c, and the tip 8e side of the blade portion 8d is on the back side of the slit 8c. It is arranged to be located. And the front-end | tip 8e of the blade part 8d is located in contact | abutting or some distance away from the opposing wall Q, without passing over the opposing wall Q which forms the slit 8c. Thereby, when the film 1b is an aluminum laminated film or an aluminum film, unlike the case where the tip 8e of the blade portion 8d passes over the opposing wall Q of the slit 8c, the aluminum that is easily torn is removed from the blade portion 8d. It is possible to reduce clogging while being pinched in the tapered space 8f between the tip 8e side of the blade portion 8d and the opposing wall Q of the slit 8c by being broken finely on the tip 8e side.

  The tool body 4 includes two divided bodies (a first divided body X1 and a second divided body X2) divided so as to be sliced through the main body portion 401 and the handle portion 402. That is, the first divided body X1 includes a substantially C-shaped first main body portion 4e constituting the main body portion 401 and a first handle portion 4f constituting the handle portion 402. Similarly, the first divided body X1 is divided into the second divided portions. The body X <b> 2 includes a substantially C-shaped second main body portion 4 g constituting the main body portion 401 and a second handle portion 4 h constituting the handle portion 402. And these 1st division body X1 and 2nd division body X2 are mutually connected by fixing tools (not shown), such as a screw | thread which connects the attachment hole 4i opened in self.

  Therefore, the first divided body X1 and the second divided body X2 (specifically, the first main body portion 4e and the second main body portion 4g) are connected to the first and second blade bodies 5, 6 and The cover body 7 is supported so as to be sandwiched. In the illustrated embodiment, the first and second blade bodies 5 and 6 are provided with holes 5b and 6b communicating with the mounting holes 4i and 4i. The mounting holes 4i and 4i and the holes 5b, The first and second blade bodies 5, 6 are fixed to the main body 401, that is, the tool main body 4 by passing a fixing tool (not shown) such as a screw through 6 b. The main body 401 is provided with a groove 4j that faces the penetrating part 4a and that fits the outer peripheral side of the cover body 7. The cover body 7 is guided by the groove 4j and is relative to the tool main body 4. Rotate.

  The tool body 4 is provided with a latching means 9 for holding the cover body 7 in the loading / unloading position. The latching means 9 is, for example, elastically holding the cover body 7 and is made of a metal leaf spring 9a in the illustrated embodiment.

  The first blade body 5 is made of metal, for example, and is provided on both sides of the tool body 4 with the opening 4b interposed therebetween. The first blade body 5 has the above-described hole 5b formed on the base end side, and the tip end portion is tapered to project into the opening 4b. Therefore, the first blade portion 5a is provided at the distal end portion of the first blade body 5 so as to face the mouth side of the opening 4b. The back side of the opening 4b at the tip of the first blade body 5 is a curved portion 5c that has no blade and is curved in a convex shape (see FIG. 3). .

  The 2nd blade body 6 is metal, for example, Comprising: It provides in the both sides which pinch | interpose the penetration part 4a in the tool main body 4. As shown in FIG. The second blade body 6 has the above-described hole 6b formed on the base end side, and a distal end portion which is horizontally long and protrudes from the through portion 4a. Therefore, the second blade portion 6a is provided at the tip portion of the second blade body 6 so as to face the center side of the penetrating portion 4a. In the illustrated embodiment, the first blade body 5 and the second blade body 6 are integrally formed via the connecting portion 10. However, the first blade body 5 and the second blade body 6 may be formed separately.

  The cover body 7 is made of, for example, metal, and is formed in a substantially U shape by facing portions 7c and 7c facing each other and an intermediate portion 7d that connects the facing portions 7c and 7c on one side. The outer periphery of the cover body 7 is formed in an arc shape and can be rotated relative to the tool body 4 as described above. Then, the cover body 7 receives the corrugated tube 201 (protective tube 2) from the substantially U-shaped mouth side (that is, the insertion / extraction position of the cover body 7 is the tool body of the substantially U-shaped mouth side). 4 is a rotation position that faces the opening 4b of the 4). Therefore, the inner periphery of the cover body 7 serves as an engaging portion 7a that engages with the outer periphery of the corrugated tube 201 (protective tube 2), and also serves as a holding portion 7b that holds the corrugated tube 201 (protective tube 2).

  The cover body 7 is provided with a second locking portion 7e that enters the valley 2d of the corrugated pipe 201 and prevents the corrugated pipe 201 from moving in the longitudinal direction. Specifically, the second locking portion 7e protrudes with a small thickness on the inner periphery of the cover body 7 so that a step is formed. The engaging portion 7a or the holding portion 7b includes a step portion 7f constituting a step on the inner periphery of the cover body 7. In the illustrated embodiment, the second locking portion 7e is formed over the entire inner periphery.

  Moreover, the cover body 7 is provided with a closing piece 7g that closes the front of the second blade portion 6a in the first movement region at the facing portion 7c. Specifically, the closing piece 7g is formed so as to protrude from the plate surface of the cover body 7 so as to have a height that exceeds at least the thickness of the second blade body 6, and faces the center side of the penetrating portion 4a. Is flush with the inner periphery of the cover body 7 (in the illustrated embodiment, the inner peripheral step 7f) and is part of the engaging portion 7a or the holding portion 7b.

  Further, the cover body 7 is provided with a concave hooked portion 7h on the outer periphery thereof, and the hooked portion 7h has a convex shape provided on the plate spring 9a as the hooking means 9 described above. The cover body 7 is elastically held at the insertion / removal position by fitting the engaging portion 9b. That is, the engaging portion 9b of the leaf spring 9a is fitted into the engaged portion 7h of the cover body 7 at the loading / unloading position, whereby the cover body 7 is held at the loading / unloading position. When a force is applied to rotate (move) the cover body 7 against the elasticity of the leaf spring 9a, the leaf spring 9a is deformed and the engaged portion 7h is disengaged from the engagement portion 9b. Can be rotated (moved) with respect to the tool body 4.

  Next, the effect of the cutting tool 3 having the above configuration will be described. According to this cutting tool 3, the main body part 401 (tool main body 4) includes a through part 4a through which the corrugated pipe 201 (protective pipe 2) can penetrate, and an opening part 4b through which the corrugated pipe 201 can be taken in and out of the through part 4a. And have. Here, the opening 4b protrudes from the first blade 5a that cuts the first peripheral wall 2a on the side of the narrow direction P1 of the corrugated tube 201 having a substantially oval cross section, and the through-hole 4a has a corrugate. The 2nd blade part 6a which cut | disconnects the 2nd surrounding wall 2b in the width direction P2 side of the cross-sectional substantially ellipse shape of the pipe | tube 201 protrudes.

  And the cutting tool 3 is provided with the cover body 7 in the penetration part 4a. The cover body 7 moves along a plane perpendicular to the axial center direction of the penetrating portion 4a, so that the first moving region (FIGS. 4 and 4) protrudes more toward the center of the penetrating portion 4a than the second blade portion 6a. 6), and a second movement area in which the second blade portion 6a is exposed to the center side of the penetrating portion 4a without projecting to the center side of the penetrating portion 4a than the second blade portion 6a (see FIGS. 7 and 8). And move across.

  Therefore, in order to cut the corrugated pipe 201 with the cutting tool 3, first, the cover body 7 is set in the first movement area (see FIG. 4), and the corrugated pipe 201 has a substantially oval cross section. The cutting tool 3 is advanced so as to enter the through portion 4a from the side in the wide direction P2 through the opening 4b (see FIGS. 10 and 12). At this time, the first peripheral wall 2a on the side of the narrow direction P1 of the corrugated tube 201 having a substantially oval cross section is cut by the first blade portion 5a protruding into the opening 4b (see FIGS. 10 and 11). ).

  Next, the cutting tool 3 is rotated so that the corrugated tube 201 is rotated relative to the tool body 4 (see FIG. 14). Thereby, the 2nd peripheral wall 2b in the side of the wide direction P2 of the cross-sectional oval shape of the corrugated pipe 201 is cut | disconnected by the 2nd blade part 6a which protrudes in the penetration part 4a (refer FIG. 14, FIG. 15). . Here, the cover body 7 moves to the second movement area by the operator's operation prior to the rotation of the cutting tool 3 or moves to the second movement area in conjunction with the rotation of the cutting tool 3 ( In the illustrated embodiment, it moves to the second movement area in conjunction with the rotation of the cutting tool 3). 14 and 15 show a state when the cutting tool 3 is rotated 90 ° clockwise. In order to cut the entire second peripheral wall 2b of the corrugated pipe 201, FIGS. Further, the cutting tool 3 is rotated clockwise.

  Then, after cutting the first and second peripheral walls 2a, 2b (that is, after cutting the entire circumference of the corrugated pipe 201), the side of the corrugated pipe 201 in the width direction P2 having a substantially oval cross section is the opening 4b side. The turning position of the cutting tool 3 is determined so as to face (in the illustrated embodiment, the cutting tool 3 is turned to the position shown in FIG. 12), and the cutting tool 3 is retracted from the corrugated tube 201. Thereby, the corrugated pipe | tube 201 can go outside through the opening part 4b from the penetration part 4a (refer FIG. 10, FIG. 4). Here, the cover body 7 is moved to the loading / unloading position by the operator's operation after the rotation position of the cutting tool 3 is determined, or moved to the loading / unloading position in conjunction with the rotation of the cutting tool 3 (illustrated). In the embodiment, the cutting tool 3 moves to the loading / unloading position in conjunction with the rotation).

  Thus, by this cutting tool 3, the first peripheral wall 2a on the narrow direction P1 side and the second peripheral wall 2b on the wide direction P2 side of the corrugated tube 201 (protective tube 2) having a substantially oval cross section are formed. By cutting, the corrugated pipe 201 can be cut without cutting the wiring / pipe material 1 in the corrugated pipe 201. And when putting the corrugated pipe 201 into the penetrating part 4a of the tool body 4 or when taking the corrugated pipe 201 out of the penetrating part 4a, the cover body 7 is in the first movement area and is more than the second blade part 6a. Since it protrudes in the center side of the penetration part 4a, it is not necessary to pay attention to this 2nd blade part 6a. That is, when the corrugated tube 201 is taken in and out of the penetrating portion 4a, the operator's hand or the like can be made difficult to contact the second blade portion 6a by the cover body 7 in the first movement area. In particular, in the illustrated embodiment, the cover body 7 is provided with a closing piece 7g that covers the front of the second blade portion 6a in the first movement region, and this closing piece 7g allows the operator's hand to Or the like becomes more difficult to contact the second blade portion 6a. Thus, according to the cutting tool 3, by providing the cover body 7 that protrudes closer to the center of the penetrating portion 4a than the second blade portion 6a, it is not necessary to pay attention to the second blade portion 6a, and the corrugated tube 201 The cutting work can be smoothly carried out.

  Moreover, the cover body 7 has the engaging part 7a engaged with the outer periphery of the corrugated pipe | tube 201 (protection pipe | tube 2). For this reason, the cover body 7 moves across the first movement area and the second movement area in conjunction with the rotation of the tool body 4 (that is, the cutting tool 3). Then, in the second movement area, the second peripheral wall 2b of the corrugated pipe 201 is cut by the exposed second blade portion 6a. In this way, the cover body 7 moves relative to the tool body 4 (specifically, rotates) in conjunction with the rotation of the tool body 4, so that the second blade portion 6 a is exposed or the cover body again. 7 to cover the second blade portion 6a, it is not necessary to separately operate other than the rotation of the tool body 4.

  Further, the engaging portion 7a is formed on the outer sides of both the first peripheral walls 2a and 2a of the corrugated pipe 201 (protective pipe 2) (in the illustrated embodiment, both the first peripheral walls 2a and 2a and the second peripheral wall). 2b, 2b) and a holding portion 7b that holds the corrugated pipe 201 and holds the corrugated pipe 201 with the cutting tool 3 (specifically, the tool main body 4) against the corrugated pipe 201. It can suppress the rattling. For this reason, the cutting tool 3 can be accurately rotated in a direction perpendicular to the axis of the corrugated tube 201, and the second peripheral wall 2b of the corrugated tube 201 can be stably cut.

  Further, the first locking portion 4c that enters the trough 2d of the corrugated tube 201 at the mouth edge of the opening 4b of the tool main body 4 (specifically, the main body portion 401) and prevents the corrugated tube 201 from moving in the longitudinal direction. Similarly, the cover body 7 is provided with a second locking portion 7e that enters the valley 2d of the corrugated pipe 201 and prevents the corrugated pipe 201 from moving in the longitudinal direction. Therefore, the position of the cutting tool 3 with respect to the longitudinal direction of the corrugated tube 201 is determined by the first locking portion 4c and the second locking portion 7e, and the first blade body 5 and the second blade body 6 are corrugated. The same crest 2c portion of the tube 201 can be accurately cut.

  Further, since the second locking portion 7e always enters and locks the valley 2d of the corrugated tube 201 with respect to the relative rotation of the corrugated tube 201 inserted into the penetrating portion 4a, the corrugated tube 201 When the entire circumference of the corrugated tube 201 is cut, or until the corrugated tube 201 is turned to the direction of exiting from the opening 4b, the cut corrugated tube 201 is locked by the second locking portion 7e. The sides do not leave in the longitudinal direction.

  Further, when the cutting tool 3 does not have the second locking portion 7e, both the corrugated pipe 201 (protective pipe 2) that has been cut into two are separated from each other from the cutting tool 3. Leave. Therefore, when the exposed wiring / piping material 1 is taken out from the through portion 4a through the opening 4b, the second blade portion 6a of the second blade body 6 is moved to the first movement region (specifically, the loading / unloading position). Since a certain cover body 7 is covered, and the back side of the opening 4b at the distal end portion of the first blade body 5 has no blade and is a curved portion 5c (see FIG. 3), the wiring The piping material 1 is not damaged by the second blade body 6 or the first blade body 5. However, when the cutting tool 3 does not have the second locking portion 7e, the cutting tool 3 is cut so as to extract the exposed wiring / pipe material 1 from the through portion 4a after cutting the corrugated tube 201 (protective tube 2). The tool 3 may be moved in the longitudinal direction of the wiring / piping material 1. In this case, the wiring body / pipe material 1 is not damaged by the second blade body 6 by positioning the cover body 7 in the first movement region.

  In addition, this invention is not necessarily limited to embodiment mentioned above, A various other change is possible. For example, the piping material as the wiring / piping material 1 may be a water supply pipe, a hot water supply pipe, or other piping material, instead of a piping material for tracking or floor heating. Moreover, although the piping material is formed by winding the film 1b around the pipes 1a and 1a, the film 1b may be omitted. Further, the wiring / piping material 1 may be a wiring material for communication or power in addition to the piping material.

  In addition, when cutting the protective tube 2 using the cutting tool 3, the protective tube 2 is cut in a state where the wiring / pipe material 1 is inserted into the protective tube 2, and the protective tube 2 is also wired / piped. The protective tube 2 may be cut in a state where one material is not inserted.

  In addition, the engaging portion 7a and the holding portion 7b of the cover body are formed of a step portion 7f on the inner periphery of the cover body 7. In addition, the tip of the second locking portion 7e is a valley of the corrugated tube 201. By hitting the bottom of 2d, the tip of the second locking portion 7e may be the engaging portion 7a or the holding portion 7b.

  Moreover, even if the engaging part 7a in the cover body 7 does not consist of the holding part 7b fitted to the corrugated pipe 201 (protective pipe 2), the cover body 7 is sufficiently long for the corrugated pipe 201 (protective pipe 2). You may engage with a stick. Furthermore, the engaging portion 7a may not be provided. In this case, however, the movement of the cover body 7 across the first movement area and the second movement area is not linked to the rotation of the tool body 4 (cutting tool 3). It must be done by moving itself directly.

  Moreover, although the cutting tool 3 is provided with the 1st latching | locking part 4c and the 2nd latching | locking part 7e, one or both of these 1st and 2nd latching | locking parts 4c and 7e do not need to be.

  Further, the cover body 7 is formed in a substantially U-shape with opposing portions 7c and 7c facing each other and an intermediate portion 7d that connects the opposing portions 7c and 7c on one side, but the intermediate portion 7d is eliminated. , It may consist of two separated opposing portions 7c, 7c. By doing so, the rotation position of the cover body 7 serving as the loading / unloading position can be provided in units of half rotation (180 °). In this case, it is necessary to support each of the facing portions 7c and 7c so as to be rotatable with respect to the tool body 4, and each of the facing portions 7c and 7c is latched by a leaf spring 9a or the like. It is desirable to hold it in and out by means 9.

  In addition, the cover body 7 may be moved in a translational manner, instead of being moved by the rotation, over the first movement region and the second movement region. Further, the movement over the first movement area and the second movement area may not be interlocked with the rotation of the cutting tool 3 but may be performed by the operator's operation.

  Moreover, although the cover body 7 covers one side surface M of the second blade portion 6a, the cover body 7 may cover both side surfaces of the second blade portion 6a. Moreover, the cover body 7 has the closing piece 7g which covers the front of the 2nd blade part 6a, However, This closing piece 7g does not need to be.

  Further, the cover body 7 has a loading / unloading position in which the protective tube 2 can be inserted / removed through the opening 4b with respect to the penetrating part 4a in the first movement area. In addition, a position that allows entry and exit may be provided.

  Moreover, although the 1st blade body 5 and the 2nd blade body 6 are each provided in a pair, only one side may be sufficient. Here, when the first blade body 5 is only one side, the first peripheral wall 2a, 2a of the protective tube 2 is cut when the protective tube 2 is inserted into the through portion 4a from the opening 4b. However, both the first peripheral walls 2a and 2a are cut by changing the direction of the cutting tool 3 with respect to the protective tube 2 and putting it in and out or by turning the cutting tool 3 upside down. be able to.

  Further, the protective tube 2 may not be the corrugated tube 201 but may be another tube such as a smooth tube.

DESCRIPTION OF SYMBOLS 1 Wiring and piping material 2 Protective pipe 201 Corrugated pipe 2a 1st surrounding wall 2b 2nd surrounding wall 2c Mountain 2d Valley 3 Cutting tool 4 Tool main body 4a Penetration part 4b Opening part 4c 1st locking part 5 1st blade 5a 1st blade part 6 2nd blade body 6a 2nd blade part 7 Cover body 7a Engagement part 7b Holding part 7e 2nd latching | locking part P1 Narrow direction P2 Wide direction

Claims (4)

A cutting tool for cutting a protective tube having a substantially oval cross section,
A tool body, a first blade body and a second blade body fixed to the tool body, and a cover body,
The tool body has a penetrating portion through which the protective tube can penetrate, and an opening through which the protective tube can be taken in and out of the penetrating portion from the side in the wide direction having a substantially oval cross section.
The first blade portion, which is the blade portion of the first blade body, protrudes into the opening, and the protective tube passes through the opening so that the protective tube has a substantially oval cross-sectional side in the narrow direction. Cutting the first peripheral wall at
The second blade portion, which is the blade portion of the second blade body, protrudes into the penetrating portion, and the protection tube passing through the penetrating portion rotates relative to the tool body to protect the second blade portion. Cutting the second peripheral wall on the side of the tube having a substantially oval cross-section in the wide direction;
The cover body is provided in the penetrating portion and is movable along a plane perpendicular to the axial center direction of the penetrating portion, and by the movement, the cover body penetrates the penetrating portion more than the second blade portion. A first movement area projecting toward the center side of the part, and a second movement area exposing the second blade part to the center side of the penetration part without projecting to the center side of the penetration part from the second blade part And move across
The said cover body is a cutting tool for protective tubes which has the insertion / extraction position which enables the said protection tube to be withdrawn / inserted with respect to the said penetration part in the said 1st movement area through the said opening part. The cover body is supported by the tool body so as to be rotatable about the axis of the penetrating portion, and
The cover body has an engaging portion that engages with an outer periphery of the protective tube,
When the tool body is rotated with respect to the protective tube inserted into the penetrating portion from the opening when the cover body is in the loading / unloading position, the engaging portion is engaged with the outer periphery of the protective tube. Then, the cover body stays on the protective tube side, so that the cover body rotates relative to the tool main body and moves across the first movement area and the second movement area. And the cutting tool for protective tubes of Claim 1 in which the said 2nd blade part cut | disconnects the 2nd surrounding wall of the said protective tube in the 2nd movement area.   The said engaging part is a cutting tool for protective tubes of Claim 2 which consists of a holding part which fits the both outer sides of the 1st surrounding wall of the said protective tube, and hold | maintains the protective tube. The protective tube is a corrugated tube in which a mountain valley is formed on the peripheral wall,
The first blade body and the second blade body cut a crest portion of the corrugated tube,
At the lip of the opening is provided a first locking portion that enters the trough of the corrugated tube and prevents the corrugated tube from moving in the longitudinal direction,
4. The cutting tool for a protective tube according to claim 3, wherein the cover body is provided with a second locking portion that enters the trough of the corrugated tube and prevents the corrugated tube from moving in the longitudinal direction.

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