JP6362909B2 - Cutting tool for protective tube - Google Patents

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. 19, the cutting tool 21 is a tool for cutting the corrugated pipe 20 in a state where the wiring / piping material 1 is accommodated therein, and includes a cutter body 22 having a C-shaped enlarged head 22 a. I was prepared. 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 this type of cutting tool 21, the trajectories M1 and M2 through which the tips of the first cutting blade 25 and the second cutting blade 26 (second blade portion) pass when the corrugated tube 20 (protective tube) is cut are as follows. Approximately as shown in FIG. In particular, the second cutting edge 26 (trajectory M2) passes through the innermost side at the top portions 20c and 20c of the both-end curved wall portions 20b and 20b with respect to the peripheral wall of the corrugated tube 20, and passes outside as the distance from the top portions 20c and 20c increases. It will become. Therefore, in order to ensure the cutting of the corrugated tube 20, the second cutting blade 26 is connected to the cutting position T between the cutting by the first cutting blade 25 (track M1) and the cutting by the second cutting blade 26 (track M2). However, in relation to the internal wiring / piping material 1, the second cutting blade 26 enters the corrugated tube 20 at the tops 20 c and 20 c of the curved walls 20 b and 20 b at both ends. Since it is necessary to limit the amount of protrusion, the second cutting edge 26 could not be moved further inward.

  The present invention has been made in order to solve the above-described conventional drawbacks. The object of the present invention is to reliably cut a protective tube having a substantially oval cross section and to provide a second blade portion. An object of the present invention is to provide a cutting tool for a protective tube that can limit the amount of protrusion into the protective tube.

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, and a first blade body and a second blade body that are fixed to the tool 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. Then, when cutting at least the top portion of the second peripheral wall on the side away from the axis of the protection tube, the protection tube is bent so that at least the top portion to be cut is bent to the inside of the protection tube. On both sides of the tool body sandwiching the penetrating portion of the tool body, the pressing portion is pressed so that the interval between the pressing portions is shorter than the width dimension of the protective tube in the wide direction and longer than the width dimension of the protective tube in the narrow direction. It is provided to.

  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 tool body is provided with a pressing portion that pushes the protective tube so as to bend at least the top portion of the second peripheral wall of the protective tube toward the inside of the protective tube when cutting. . Therefore, in order to cut the protective tube with this cutting tool, the cutting tool is advanced so that the protective tube enters the penetrating portion through the opening from the side in the wide direction having a substantially oval cross section. 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 tool main body is provided with a pressing portion, and the protective tube is pressed by the pressing portion in the process of cutting at least the top portion of the second peripheral wall with the second blade body. At least the top portion to be cut is bent toward the inside of the protective tube, thereby limiting the amount of protrusion of the second blade portion into the protective tube. That is, even when the second blade portion is brought close to the axis of the protective tube to reliably cut the protective tube, by pressing the protective tube with the pressing portion and bending at least the top portion to the inside of the protective tube, The amount of protrusion of the second blade portion into the protective tube can be limited.

  A cutting tool for a protective tube according to a second aspect of the present invention is the cutting tool according to the first aspect, wherein the pressing portion is formed by cutting the first blade portion on the peripheral wall of the protective tube. It arrange | positions so that the said protection tube may not be pushed in the mutual communication position with the cutting | disconnection by 2 blade parts. Thus, by restricting the bending of the protective tube by the pressing portion, it is possible to reduce the load when rotating the cutting tool.

  Moreover, the cutting tool for a protective tube according to the invention described in claim 3 is the cutting tool according to claim 1 or 2, wherein the protective tube is a corrugated structure in which peaks and valleys are continuously arranged in the longitudinal direction. It consists of a tube. And the said 1st blade part and the said 2nd blade part cut | disconnect the peak part of the said corrugated pipe | tube. Therefore, the first blade portion is provided so as not to protrude inward from the inner surface of the corrugated pipe in the trough portion in the process of cutting the peak portion by the first blade portion, and the second blade The portion is provided so as not to protrude inward from the inner surface of the corrugated pipe in the valley portion in the process of cutting the peak portion by the second blade portion. Thus, when cutting the corrugated tube, the first blade portion and the second blade portion do not protrude inward from the inner surface of the valley portion of the corrugated tube, so that the wiring / pipe material is inserted inside the corrugated tube. Even in this case, the wiring / pipe material is not damaged by the first blade portion or the second blade portion.

  According to a fourth aspect of the present invention, there is provided a cutting tool for a protective tube according to any one of the first to third aspects, wherein one side of the penetrating portion sandwiching the second blade body. The corrugated tube as the protective tube, in which peaks and valleys are continuously arranged in the longitudinal direction, having a locking portion that enters the valley and prevents the corrugated tube from moving in the longitudinal direction, The part is provided at least on the one side. As described above, when the locking portion is provided on one side of the second blade, the first peripheral wall of the corrugated tube is cut by the first blade and the corrugated by the second blade. In the corrugated pipe that has been cut off by the latching portion of the corrugated pipe that has been cut by cutting the second peripheral wall of the pipe, the side of the corrugated pipe that has a substantially oval cross-section in the wide direction is the side of the tool body. After the turning position of the cutting tool is determined so as to face the opening side, the corrugated pipe can come out through the opening through the opening by retracting the cutting tool from the corrugated pipe. Here, since the pressing portion is provided on at least one side where the locking portion is provided, the corrugated tube on the side where the movement in the longitudinal direction is prevented by the locking portion, in the wide direction having a substantially oval cross section. In the process of turning the cutting tool so that the side faces the opening side of the tool body, the pressing portion can press the second peripheral wall of the corrugated tube, and thereby the second blade portion in the corrugated tube The amount of protrusion can be limited.

  Moreover, the cutting tool for protective tubes which concerns on invention of Claim 5 is a cutting tool of any one of Claim 1 thru | or 3, WHEREIN: The said press part pinches | interposes the said 2nd blade body. The pressing portions are located at different distances from the second blade body, and the pressing portions on the side far from the second blade body are compared to the pressing portions on the near side. Then, the protrusion protrudes into the penetrating portion so as to increase the pushing amount of the protective tube. As described above, when the pressing portion sandwiching the second blade body is located at a different distance from the second blade body, the pressing portion on the side far from the second blade body is changed to the pressing portion on the near side. In comparison, by projecting so that the pushing amount becomes large, the portion of the protective tube cut by the second blade body is bent evenly on both sides of the second blade body, and the protective tube is It becomes possible to cut perpendicularly to the longitudinal direction.

  According to the cutting tool for a protective tube according to the present invention, by providing the pressing portion that pushes the protective tube and bends at least the top portion of the second peripheral wall to the inside of the protective tube, the protective tube having a substantially oval cross section is reliably obtained. And the amount of protrusion of the second blade portion into the protective tube can be limited.

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 plan view when the cutting tool is rotated approximately 50 ° clockwise. 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. Similarly, it is the enlarged view which abbreviate | omitted the principal part of FIG. 15, and abbreviate | omitting the cover body. Similarly, a 1st and 2nd blade body is shown, (a) is a top view, (b) is a G arrow enlarged view, (c) is an enlarged end elevation by HH line. It is a top view which shows the conventional cutting tool. Similarly, it is explanatory drawing which shows the locus | trajectory of a cutting | disconnection of 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 18 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, and a first blade body 5 and a second blade body 6 that are fixed to the tool body 4. 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 penetrating portion 4a). To do.

The tool body 4 includes at least the top portion 2x to be cut when the top portion 2x on the second peripheral wall 2b of the protection tube 2 is separated from at least the axis of the protection tube 2. The pressing portion 4x that pushes the protective tube 2 so as to be bent inward of the protective member 2 is protected on both sides of the penetrating portion 4a so that the interval between the pressing portions 4x and 4x is shorter than the width dimension of the protective tube 2 in the wide direction P2. The tube 2 is provided so as to be longer than the width dimension in the narrow direction P1 (see FIGS. 15 to 17). In the illustrated embodiment, the pressing portion 4x is formed by cutting the first blade body (specifically, the first blade portion 5a) and the second blade body 6 (specifically, the second blade body 5) on the peripheral wall of the protective tube 2. In the mutual communication position S with the cutting by the blade part 6a), it is arranged so as not to push the protective tube 2 (see FIG. 14).

  Further, the cutting tool 3 includes a cover body 7. The cover body 7 is provided in the penetrating portion 4a and can move 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, at least one side surface M of the second blade portion 6a (more specifically, the one side surface M of the second blade portion 6a is covered with the second blade portion 6a) of the penetrating portion 4a. A first movement region (see FIGS. 4 and 6) that protrudes to the center side, and the second blade part 6a to the center side of the penetration part 4a without protruding to the center side of the penetration part 4a rather than the second blade part 6a. It moves over the second moving area to be exposed (see FIGS. 7 and 8). 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 in which a crest 2c and a trough 2d are continuously arranged in the longitudinal direction. 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 peak portion 2c of the corrugated tube 201. In FIG. 17, reference symbol L1 indicates a trajectory through which the tip of the first blade portion 5a (first blade body 5) passes. As understood from the trajectory L1, the first blade portion 5a In the process of cutting the peak portion 2c by the one blade portion 5a, it is provided so as not to protrude inward from the inner surface 2z of the corrugated tube 201 in the valley portion 2d. That is, the protrusion amount of the first blade body 5 that will be described in detail later from the lip 4y of the opening 4b is the dimension between the inner and outer periphery of the first peripheral wall 2a of the corrugated tube 201 (that is, the inner surface at the valley portion 2d). 2z and the distance between the outer surfaces of the peaks 2c) (see FIGS. 11 and 17). Similarly, in FIG. 17, reference numeral L2 indicates a trajectory through which the tip of the second blade portion 6a (second blade body 6) passes. As can be understood from this locus L2, the second blade portion 6a In the process of cutting the peak portion 2c by the second blade portion 6a, it is provided so as not to protrude inward from the inner surface 2z of the corrugated tube 201 in the valley portion 2d. That is, the protrusion amount of the second blade body 6 that will be described in detail later from the pressing portion 4x is the dimension between the inner and outer periphery of the second peripheral wall 2b of the corrugated tube 201 (that is, the inner surface 2z and the peak portion at the valley portion 2d). 2c) (see FIG. 16 and FIG. 17). In FIG. 17, reference numeral 2y indicates the inner surface of the corrugated pipe 201 in the peak portion 2c.

  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. Therefore, the pressing portion 4x is provided on both sides of the penetrating portion 4a, that is, on the side where the second blade body 6 which will be described in detail later is provided, and at a position with a predetermined dimension. In the illustrated embodiment, the pressing portion 4x is formed integrally with the main body portion 401 (tool main body 4). Specifically, the pressing portion 4x is formed so as to protrude toward the center of the penetrating portion 4a so as to narrow the inner diameter of the main body portion 401, and the tip thereof becomes a straight line.

  In the opening 4b, a first locking portion 4c that enters the valley 2d of the corrugated tube 201 and prevents the corrugated tube 201 from moving in the longitudinal direction is provided at the lip 4y of the opening 4b. 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). . Further, as shown in FIG. 18, the end 5x on the rear side of the first blade portion 5a in the first blade body 5 has an arcuate corner in the plate thickness direction (in the illustrated embodiment, the plate 5 Both corners in the thickness direction are chamfered by continuous arcs.

  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. Here, the intersection N between the trajectory L1 through which the tip of the first blade portion 5a passes and the trajectory L2 through which the tip of the second blade portion 6a passes is the inner surface of the protective tube 2 to be cut (in the illustrated embodiment). Is located on the inner side of the corrugated pipe 201 than the inner surface 2y of the peak part 2c (see FIG. 17), whereby the protective pipe 2 (the peak part 2c of the corrugated pipe 201 in the illustrated embodiment). Is securely cut. 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 trough portion 2d of the corrugated tube 201 and prevents the corrugated tube 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.

  Then, when cutting at least the top portion 2x of the second peripheral wall 2b of the corrugated tube 201, the tool body 4 pushes the corrugated tube 201 so as to bend the at least the top portion 2x to the inside of the corrugated tube 201. A pressing portion 4x is provided (see FIGS. 15 to 17).

  Moreover, 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 rotates relative to the tool body 4 (see FIGS. 14 and 15). Thereby, the 2nd surrounding 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. 15, FIG. 16). . Here, the cover body 7 moves to the second movement area in conjunction with the rotation of the cutting tool 3. The tool body 4 is provided with a pressing portion 4x, and in the process of cutting at least the top portion 2x of the second peripheral wall 2b of the corrugated tube 201 with the second blade body 6 by the pressing portion 4x. When the corrugated tube 201 is pushed, at least the top portion 2x to be cut is bent to the inside of the corrugated tube 201, thereby limiting the amount of protrusion of the second blade portion 6a (the locus L2) into the corrugated tube 201. (See FIGS. 15 to 17). That is, even when the second blade portion 6a is brought close to the axial center of the corrugated tube 201 in order to reliably cut the corrugated tube 201, the corrugated tube 201 is pushed by the pressing portion 4x and at least the top portion 2x of the corrugated tube 201 is pressed. The amount of protrusion of the second blade portion 6a into the corrugated tube 201 can be limited by bending inward. 15 and 16 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 moves to the loading / unloading position in conjunction with the rotation of the cutting tool 3.

  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. Can be cut. And according to this cutting tool 3, by providing the pressing part 4x which pushes the corrugated pipe | tube 201 and bends at least the top part 2x of the 2nd surrounding wall 2b to the inner side of the corrugated pipe | tube 201, it is a corrugated pipe | tube with a substantially oval cross section. 201 can be cut | disconnected reliably and the protrusion amount into the corrugated pipe | tube 201 of the 2nd blade part 6a can be restrict | limited.

  In addition, the pressing portion 4x is a corrugated portion at a communication position S between the cutting by the first blade body 5 and the cutting by the second blade body 6 on the peripheral wall of the corrugated tube 201 (specifically, the crest portion 2c of the peripheral wall). It arrange | positions so that the pipe | tube 201 may not be pushed (refer FIG. 14). Thus, by restricting the bending of the corrugated tube 201 by the pressing portion 4x, it is possible to reduce the load when the cutting tool 3 is rotated.

  The protective tube 2 includes a corrugated tube 201 in which a crest portion 2c and a trough portion 2d are continuously arranged, and includes a first blade portion 5a (first blade body 5) and a second blade portion 6a (second blade). The body 6) cuts the peak 2c of the corrugated tube 201. And the 1st blade part 5a (trajectory L1) of the 1st blade body 5 is in the process of the cutting | disconnection of the peak part 2c by the 1st blade part 5a inside the inner surface 2z of the corrugated pipe | tube 201 in the trough part 2d. It is provided so as not to protrude. And the 2nd blade part 6a (trajectory L2) of the 2nd blade body 6 is in the process of the cutting | disconnection of the peak part 2c by the 2nd blade part 6a inside the inner surface 2z of the corrugated pipe | tube 201 in the trough part 2d. It is provided so as not to protrude (see FIG. 17). Thus, in cutting the corrugated tube 201, the first blade portion 5a (track L1) and the second blade portion 6a (track L2) do not protrude inward from the inner surface 2z of the valley portion 2d of the corrugated tube 201. Even when the wiring / piping material 1 is inserted into the corrugated tube 201, the wiring / piping material 1 is not damaged by the first blade portion 5a or the second blade portion 6a. In the illustrated embodiment, the second peripheral wall 2b of the corrugated tube 201 is pressed by the pressing portion 4x and bent inward, so that the tip of the second blade portion 6a is a valley portion 2d of the corrugated tube 201. It is located sufficiently away from the inner surface 2z (see FIG. 17). And although illustration is abbreviate | omitted, when the press part 4x is not provided, although the front-end | tip of the 2nd blade part 6a will almost arrive at the inner surface 2z in the trough part 2d of the corrugated pipe | tube 201, it reaches in this way Even if it is a case where it is located slightly behind, by providing the pressing portion 4x, the second blade portion 6a does not protrude inward from the inner surface 2z of the corrugated tube 201 with a margin. can do.

  Moreover, the cutting tool 3 enters into the trough part 2d of the corrugated pipe 201 on one side of the penetrating part 4a sandwiching the second blade body 6, and serves as a locking part that prevents the corrugated pipe 201 from moving in the longitudinal direction. The second locking portion 7e is provided, and the pressing portion 4x is provided at least on the one side. Thus, when the 2nd latching | locking part 7e is provided in the one side which pinches | interposes the 2nd blade body 6, the corrugated pipe | tube 201 by the 1st blade body 5 (specifically 1st blade part 5a) is provided. In the corrugated tube 201 divided by the cutting of the first peripheral wall 2a and the cutting of the second peripheral wall 2b of the corrugated tube 201 by the second blade body 6 (specifically, the second blade portion 6a), 2 of the cutting tool 3 so that the side of the corrugated pipe 201 on the side where the movement in the longitudinal direction is prevented by the locking part 7e is in the wide direction P2 side having a substantially elliptical cross section faces the opening 4b side of the tool body 4. The corrugated tube 201 can come out of the through-hole 4a through the opening 4b by retreating the cutting tool 3 from the corrugated tube 201 after determining the rotation position. Here, since the pressing portion 4x is provided on at least one side where the second locking portion 7e is present, the cross section of the corrugated tube 201 on the side where the movement in the longitudinal direction is prevented by the second locking portion 7e. In the process of turning the cutting tool 3 so that the substantially oval-shaped width direction P2 side faces the opening 4b side of the tool body 4, the pressing portion 4x presses the second peripheral wall 2b of the corrugated pipe 201. Thus, the amount of protrusion of the second blade portion 6a into the corrugated tube 201 can be limited.

  Further, the engaging portion 7a of the cover body 7 is formed on both outer sides of 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 It comprises a holding part 7b that is fitted to one outer side of the second peripheral walls 2b and 2b and holds the corrugated pipe 201, and this holding part 7b allows the corrugation of the cutting tool 3 (specifically, the tool body 4). Shaking with respect to the tube 201 can be suppressed. 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, a first latch that enters the trough portion 2d of the corrugated pipe 201 and prevents the corrugated pipe 201 from moving in the longitudinal direction at the mouth edge 4y of the opening 4b of the tool main body 4 (specifically, the main body section 401). Similarly, the cover body 7 is provided with a second locking portion 7e that enters the trough portion 2d of the corrugated tube 201 and prevents the corrugated tube 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 peak portion 2c of the tube 201 can be accurately cut.

  Further, the end 5x on the rear side of the first blade 5a in the first blade body 5 has a corner portion in the thickness direction chamfered in an arc shape, so that the corrugated tube 201 (protective tube 2) is provided. After cutting, when pulling out the wiring / piping material 1 and the remaining corrugated pipe 201 from the opening 4b, they are prevented from being damaged when they come into contact with the rear end 5x of the first blade 5a, and Further, it is possible to prevent the end portion of the remaining corrugated pipe 201 from being caught and difficult to pull out.

  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.

  Further, when the corrugated tube 201 (protective tube 2) is cut using the cutting tool 3, the corrugated tube 201 is cut in addition to the case where the corrugated tube 201 is cut with the wiring / pipe material 1 inserted into the corrugated tube 201. The corrugated pipe 201 may be cut in a state where the wiring / piping 1 material is not inserted therein.

  The pressing portion 4x is provided on both sides of the second blade body 6 in the thickness direction of the tool body 4, and the pressing portions 4x and 4x are located at different distances from the second blade body 6. However, at this time, the pressing amount of the pressing portions 4x and 4x for pressing the corrugated tube 201 (protective tube 2) does not need to be the same, and is far from the second blade body 6. The pressing portion 4x on the side (the lower pressing portion 4x in FIGS. 8 and 16) is compared to the pressing portion 4x on the near side (the upper pressing portion 4x in FIGS. 8 and 16). You may protrude in the penetration part 4a so that pushing amount may become large. Thus, when the pressing portions 4x and 4x sandwiching the second blade body 6 are located at different distances from the second blade body 6, the pressing portion 4x on the side far from the second blade body 6 is By projecting so that the pushing amount becomes larger than the pushing portion 4x on the near side (for example, the pushing amount for pushing the corrugated tube 201 (protective tube 2) is reduced from the second blade body 6). The portion of the corrugated tube 201 that is cut by the second blade body 6 is bent evenly on both sides of the second blade body 6 so that the corrugated tube 201 is It becomes possible to cut perpendicularly to the longitudinal direction.

  Further, the pressing portion 4x may be provided only on one side of the second blade body 6 without being provided on both sides of the second blade body 6 in the thickness direction of the tool body 4. . In this way, by providing the pressing portion 4x only on one side sandwiching the second blade body 6, the corrugated tube 201 (protective tube 2) and the pressing portion 4x can be compared with the case where the pressing portion 4x is provided on both sides. The cutting tool 3 can be rotated with a small force by reducing the frictional resistance. Moreover, even if it is a case where the press part 4x is provided in the both sides which pinch | interpose the 2nd blade body 6 in the thickness direction of the tool main body 4, it is compared with one press part 4x about these press parts 4x and 4x. In addition, the frictional resistance between the corrugated tube 201 (protective tube 2) and the pressing portions 4x and 4x can be reduced by reducing the degree of protrusion of the other pressing portion 4x. When the pressing portion 4x is provided only on one side sandwiching the second blade body 6, as described above, the second locking portion 7e is provided on one side where the pressing portion 4x is present. However, for the same reason, when the pressing portion 4x is provided on both sides sandwiching the second blade body 6 and the degree of protrusion differs from each other, the degree of protrusion is relative. It is preferable to provide the second locking portion 7e on the side where the one pressing portion 4x that is larger than the other is present.

  Further, the pressing portion 4x pushes the corrugated tube 201 at the mutual connection position S between the cutting by the first blade body 5 and the cutting by the second blade body 6 on the peripheral wall of the corrugated tube 201 (protective tube 2). Although it arrange | positions so that it may not exist (refer FIG. 14), you may push the corrugated pipe | tube 201 so that the 2nd surrounding wall 2b may bend to the inner side of the corrugated pipe | tube 201 also in this connection position S.

  Further, the pressing portion 4x may be formed in a bent shape, an arc shape, a curved shape, or the like, without being formed so that the tip thereof is a straight line, and the penetrating portion 4a is formed by the pressing portion 4x. 4x may be formed in an elliptical shape having a short axis in the direction between 4x, and a part of the elliptical shape may be the tip of the pressing portion 4x.

  Further, when cutting at least the top portion 2x in the second peripheral wall 2b, the corrugated tube 201 (in the corrugated tube 201 (protective tube 2) is bent by the pressing portion 4x so that at least the top portion 2x to be cut is bent inside the corrugated tube 201 (protective tube 2). The protective tube 2) is pushed, but this means that the portion to be cut only needs to bend inward, and the bent portion and the portion pressed by the pressing portion 4x do not necessarily coincide with each other. That is, for example, the vicinity or both sides of the portion to be bent may be pressed by the pressing portion 4x.

  Moreover, by providing the tool body 4 with the pressing portion 4x, the amount of protrusion of the second blade portion 6a into the corrugated tube 201 (protective tube 2) is limited, whereby the tip of the second blade portion 6a is Although it is located in front of the inner surface 2z of the corrugated tube 201 at the valley portion 2d, the present invention is not limited to this, and if the amount of protrusion of the second blade portion 6a is limited, the second blade portion 6a is the inner surface of the corrugated tube 201. You may protrude from 2z.

  Further, the pressing portion 4x may not be formed integrally with the main body 401 (tool main body 4), but may be assembled and integrated with the main body 401, for example.

  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.

  Moreover, although the cutting tool 3 is provided with the cover body 7, this cover body 7 does not need to be provided. And when there is no cover body 7, the 2nd latching | locking part 7e may be provided in the tool main body 4. FIG.

  Moreover, although the 1st blade body 5 is provided with a pair, only one side may be sufficient. In this case, only one of the first peripheral walls 2a and 2a of the corrugated tube 201 is cut when the corrugated tube 201 (protective tube 2) is inserted into the through-hole 4a from the opening 4b. Both the first peripheral walls 2a and 2a can be cut by changing the direction of the cutting tool 3 with respect to the pipe 201 or by putting the cutting tool 3 upside down.

  Similarly, although the pair of second blade bodies 6 is provided, only one of them may be provided. However, as described above, it is desirable that a pair of the pressing portions 4x be provided even when the second blade body 6 is only one side.

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

2 Protective tube 201 Corrugated tube 2a 1st surrounding wall 2b 2nd surrounding wall 2c Mountain part 2d Valley part 2x Top part 2z Inner surface of the corrugated pipe in the valley part 3 Cutting tool 4 Tool main body 4a Through part 4b Opening part 4x Pressing part 5 1st 1 blade body 5a first blade portion 6 second blade body 6a second blade portion 7e second locking portion (locking portion)
P1 Narrow direction P2 Wide direction S Contact position

Claims (5)

A cutting tool for cutting a protective tube having a substantially oval cross section,
A tool body, and a first blade body and a second blade body fixed to the tool 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 broad direction of the oval cross-section of the tube;
When cutting at least the top portion of the second peripheral wall on the side away from the axis of the protective tube, the pressing of the protective tube so as to bend at least the top portion to be cut to the inside of the protective tube Are provided on both sides of the tool body so that the interval between the pressing parts is shorter than the width dimension of the protective tube in the wide direction and longer than the width dimension of the protective tube in the narrow direction. Cutting tool for protective tube.   The said press part is arrange | positioned so that the said protection tube may not be pressed in the mutual connection position of the cutting | disconnection by the said 1st blade part and the cutting | disconnection by the said 2nd blade part in the surrounding wall of the said protection tube. Cutting tool for protective tube as described in 1. The protective tube is composed of a corrugated tube in which peaks and valleys are continuously arranged in the longitudinal direction,
The first blade portion and the second blade portion cut a peak portion of the corrugated tube,
The first blade portion is provided so as not to protrude inward from the inner surface of the corrugated pipe in the valley portion in the process of cutting the peak portion by the first blade portion, and
The said 2nd blade part is provided so that it may not protrude inside the inner surface of the said corrugated pipe | tube in the said trough part in the process of the cutting | disconnection of the said peak part by the 2nd blade part. Cutting tool for protective tube.   The cutting tool enters a trough portion of a corrugated tube as a protective tube, in which a crest portion and a trough portion are continuously arranged in the longitudinal direction, on one side of the penetrating portion sandwiching the second blade body. The cutting tool for a protective tube according to any one of claims 1 to 3, further comprising a locking portion that prevents movement of the corrugated tube in a longitudinal direction, wherein the pressing portion is provided on at least the one side. .   The pressing portions are provided on both sides of the second blade body, and the pressing portions are located at different distances from the second blade body and are far from the second blade body. 4. The pressing part according to claim 1, wherein the pressing part protrudes into the penetrating part so that a pressing amount of pressing the protective tube is larger than a pressing part on a near side. 5. Cutting tool for protective tube.

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