JP2015165881A - cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool capable of removing the surface layer part of a tubular body partially while reducing a working man-hour.SOLUTION: The invention relates to a cutter 1 capable of cutting a surface layer part 12 of a pipe 10 having an inner pipe 11 and the surface layer part 12. The cutter 1 comprises: a stem 2, with which an end face 10e of the pipe 10 can contact; an arm part 3 extending forward from the stem 2; and a cutting part 5 for cutting the surface layer part 12 of the pipe 10 when the end face 10e of the pipe 10 is rotated in a circumferential direction R of the pipe 10, while being made to contact the stem 2.

Description

  The present invention relates to a cutting tool capable of cutting a surface layer portion of a tubular body.

  When connecting the inner pipe of a laminated pipe to a connection part such as a joint, a cylindrical foam as the surface part of the tubular body can be inserted as a cutting tool used to partially remove the surface part of the laminated pipe There exists a cutter which arrange | positions a cutting blade inside a circular pipe and forms the notch part along a pipe-axis direction in the said cylindrical foam (for example, refer patent document 1).

  As another cutting tool, there is a skin cutter that can be used with one hand (see, for example, Non-Patent Document 1).

JP-A-6-221495

“INOAC Polyethylene Pipe Series for Water Supply Civil Engineering / Agriculture / Fisheries / Industrial Use” Skin Cutter 20111 / vol. 2 Inoac Corporation Living Environment p8-12

  However, since the cutter described in Patent Document 1 only cuts the surface layer portion of the laminated pipe, when the surface layer portion into which the cut is cut is partially removed, the cylindrical foam is used. Inserting into the cutter to form an incision part in the axial direction, taking out the cylindrical foam having the incision part from the cutter, and only the surface layer part having the incision part And a step of cutting in the circumferential direction by a separate means.

  Moreover, in order to remove the said surface layer part partially using the skin cutter of a nonpatent literature 1, by using the said skin cutter, the process of marking (marking a marked line) in the circumferential direction of the said surface layer part, and The step of forming the surface layer portion along the axial direction to the position of the marking, and the surface layer portion having the cut portion in the circumferential direction along the marking by using the skin cutter Process.

  As described above, all the conventional cutting tools have a complicated work process for removing a part of the surface layer portion from the laminated pipe, and there is room for improvement.

  The objective of this invention is providing the cutting tool which can remove the surface layer part of the said tubular body partially, reducing a work man-hour.

The cutting tool of the present invention is a cutting tool capable of cutting the surface layer portion of a tubular body having an inner tube and a surface layer portion covering the inner tube, and a base portion with which a longitudinal end surface of the tubular body can contact An arm portion extending forward from the base portion, and a blade portion disposed on the arm portion and capable of cutting the surface layer portion of the tubular body when rotated in a circumferential direction of the tubular body. It is what.
According to the present invention, only the surface layer portion can be cut only by rotating in the circumferential direction of the tubular body.

In the present invention, the blade portion is arranged so that an exposure amount in a length direction of the inner tube when the surface layer portion is removed from the tubular body is equal to a connection amount with a connection member connecting the inner tube. It is preferable that
In this case, by marking the distance from the base portion to the blade portion and the connection allowance of the connecting member, the drawing work is not necessary.

In the present invention, it is preferable that the edge portion of the blade portion extending in the cutting direction has an arc shape.
In this case, the resistance generated in the blade portion when the surface layer portion is cut can be reduced.

In the present invention, it is preferable to have a guard portion that extends forward from the base portion and protects the inner tube of the tubular body against the blade portion at least when the surface layer portion is cut by the blade portion.
In this case, it is possible to prevent the outer surface of the inner tube from being damaged when the surface layer portion is cut.

In the present invention, the arm portion can be elastically deformed toward the tubular body at least when the surface layer portion is cut by the blade portion. In the present invention, the blade portion can be slidable toward the tubular body at least when the surface layer portion is cut by the blade portion.
In these cases, the blade portion can be easily pressed against the surface layer portion.

In the present invention, the cutting tool preferably has another arm portion extending forward from the base portion.
In this case, the cutting tool can be easily and reliably held by gripping the other arm portion.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting tool which can remove the surface layer part of the said tubular body partially can be provided, reducing an operation man-hour.

It is a perspective view which shows the cutter which is one Embodiment of the cutting tool of this invention with the laminated pipe from which a part of surface layer part is removed by the said cutter. (A) is a front view which shows the cutter of FIG. 1, (b) is an AA end elevation of (a). (A) is an expanded end view for demonstrating the 1st process when removing a part of surface layer part of a laminated pipe using the cutter of FIG. 1, (b) is the 1st of (a). It is an enlarged end view for demonstrating the 2nd process when removing the surface layer part performed following this process. (A) is an expansion perspective view which illustrates the state which removed a part of surface layer part from the laminated pipe of FIG. 1, (b) connects an inner pipe | tube to a connection member using the laminated pipe of (a). It is a perspective view which shows the state which carried out. (A) is a front view which shows the modification of the cutter of FIG. 1, (b) is a side view of (a), (c) is a rear view of (a). (A) is a front view which shows the other modification of the cutter of FIG. 1, (b) is a side view of (a), (c) is a rear view of (a). (A) is a perspective view which shows the further another modification of the cutter of FIG. 1 in the state before the use, (b) is one of surface layer parts from a laminated pipe using the cutter of (a). It is a perspective view which shows a state when a part is cut | disconnected in the circumferential direction. (A) is the perspective view which shows the modification of the cutter of FIG. 7 in the state before the use, (b) is in the state which inserted the shaft part provided in the cutter of (a) into the lamination pipe, It is a perspective view which shows the state when adjusting the position of the said shaft part.

  Hereinafter, a cutter, which is an embodiment of the cutting tool of the present invention, will be described in detail with reference to the drawings.

  In FIG. 1, the code | symbol 10 is a laminated pipe (tubular body) used as a water supply / hot-water supply pipe for houses, for example. The laminated pipe 10 extends along the length direction L. In the present embodiment, the end surface 10e in the length direction of the laminated pipe 10 is formed as a flat surface.

  In the present embodiment, the laminated pipe 10 includes an inner tube 11 and a surface layer portion 12 that covers the outer side of the inner tube 11. In the present embodiment, the inner tube 11 and the surface layer portion 12 are in a non-adhered state. In more detail, the surface layer part 12 is comprised by the intermediate | middle layer 12a which covers the outer side of the inner tube | pipe 11, and the coating layer 12b which covers the outer side of this intermediate | middle layer 12a.

  In the present embodiment, the inner tube 11 is made of, for example, a resin containing polybutene. The intermediate layer 12a is made of a resin such as a urethane foam resin, for example. The covering layer 12b is made of, for example, a resin or an elastomer containing polyethylene, polyethylene terephthalate, or the like. In the present embodiment, the intermediate layer 12a and the covering layer 12b are fixed by impregnation or adhesion to constitute the surface layer portion 12. However, the surface layer portion 12 is not limited to this configuration. For example, the surface layer portion 12 can be configured as a single layer only of the covering layer 12b by omitting the intermediate layer 12a. Further, the intermediate layer 12a of the surface layer portion 12 can have a multilayer structure of two or more layers. Furthermore, the inner pipe 11 may be a metal pipe other than resin or elastomer. That is, the constituent material of the laminated pipe 10 is not particularly limited.

  Next, in FIG. 1, reference numeral 1 denotes a cutter which is an embodiment of the cutting tool of the present invention. Reference numeral 2 denotes a base portion with which the longitudinal end face 10e of the laminated pipe 10 can come into contact. In the present embodiment, as shown in FIG. 2A, the base 2 has a plurality of (four in the present embodiment) cutouts at intervals along the outer edge of the circular outer edge of the central axis O. A gear-shaped flat plate in which C is formed. In the present embodiment, the central axis O of the base 2 coincides with the central axis of the cutter 1 (hereinafter also referred to as “the central axis O of the cutter 1”). Moreover, the contact surface 2a of the base 2 which the laminated pipe 10 contacts is formed as a flat surface.

  Reference numerals 3 and 4 denote an arm portion extending forward from the base portion 2 and other arm portions. Here, the front refers to a direction protruding from the contact surface 2 a of the base 2, and extends along the central axis O of the cutter 1 in the present embodiment. More specifically, as shown in FIG. 1, the arm portions 3 and 4 extend in the length direction L of the laminated pipe 10.

  In the present embodiment, the arm 3 is disposed at one outer edge of the contact surface 2 a formed between two notches C formed in the base 2. Moreover, in this embodiment, the arm part 4 is arrange | positioned at the outer edge of the remaining three contact surfaces 2a formed between the two notches C formed in the base 2, respectively. As a result, on the contact surface 2 a side (front side) of the base portion 2, an accommodation portion S of the laminated pipe 10 surrounded by a total of four arm portions, that is, one arm portion 3 and three arm portions 4 is formed. . In the accommodating part S, the cutter 1 can be rotated in the circumferential direction R of the laminated pipe 10 in a state in which the lengthwise end face 10 e of the laminated pipe 10 is in contact with the contact surface 2 a of the base 2. In the present embodiment, the arms 3 and 4 have a flat plate shape as shown in FIG. Specifically, as shown in FIG. 2A, each of the arm portions 3 and 4 has a longitudinal cross-sectional shape (in this embodiment, a cross-sectional shape orthogonal to the central axis O of the cutter 1) on the outer edge side of the base portion 2. It has an arc shape protruding toward the surface.

  Reference numeral 5 denotes a blade portion disposed on the arm portion 3. The blade portion 5 is disposed on the center axis O side of the cutter 1. In other words, the blade portion 5 is disposed inside the arm portion 3 (on the side facing the surface layer portion 12 of the laminated pipe 10 when the laminated pipe 10 is accommodated in the accommodating portion S). In the present embodiment, the blade portion 5 is fixed to the arm portion 3. Furthermore, in this embodiment, as shown in FIG.2 (b), the blade part 5 is arrange | positioned in the position from which the dimension from the contact surface 2a to the ridgeline 5a of the blade part 5 mentioned later becomes (DELTA) X. The dimension ΔX is the maximum removal amount along the length direction L of the surface layer portion 12 removed from the laminated pipe 10, in other words, the maximum exposure amount of the inner tube 11 exposed from the laminated pipe 10.

  Moreover, in this embodiment, the blade part 5 has the arm part 3 when the shape of the ridge line 5a extending in the cutting direction is viewed from the front (contact surface 2a side) of the cutter 1 as shown in FIG. It is the shape which protrudes in circular arc shape toward the inner side. Here, the cutting direction is a direction in which the blade portion 5 moves when the surface layer portion 12 of the laminated pipe 10 is cut in the circumferential direction R. Thus, when the shape of the ridge line 5a of the blade part 5 is a shape protruding in an arc shape toward the surface layer part 12 of the laminated pipe 10, when the surface layer part 12 is cut along the circumferential direction R of the laminated pipe 10 The resistance generated in the blade portion 5 can be reduced. However, the shape of the ridge 5a is not limited to this. For example, the shape of the ridge 5a can be a triangular shape that projects toward the inside of the arm 3 when the cutter 1 is viewed from the front. Alternatively, the shape of the ridge line 5a may be a shape that is recessed in an arc shape toward the arm 3 when the cutter 1 is viewed from the front, as opposed to FIG. Furthermore, the shape of the ridge 5a can be a straight line. That is, the shape of the ridge line 5a extending in the cutting direction of the blade portion 5 can be changed as appropriate.

  Reference numeral 6 denotes a guard portion that protects the inner tube 11 of the laminated pipe 10 against the blade portion 5 at least when the surface layer portion 12 is cut by the blade portion 5. In this embodiment, as shown to Fig.2 (a), the guard part 6 is one place in which the arm part 3 was provided among the contact surfaces 2a of the base 2 formed between the four notches C. As shown in FIG. Are arranged at an interval with respect to the blade portion 5 on the inner edge side. Moreover, the guard part 6 is extended from the contact surface 2a to the position beyond the ridge line 5a of the blade part 5, as shown in FIG. 2B, the guard portion 6 extends in parallel with the arm portions 3 and 4 from the contact surface 2a, and when the laminated pipe 10 is pushed into the accommodating portion S, the inner pipe 11 and the surface layer of the laminated pipe 10 are formed. It is inserted by being separated from the portion 12 and arranged inside the surface layer portion 12. In the present embodiment, as shown in FIG. 2B, an inclined surface 6 a that tapers toward the tip is formed at the tip of the guard portion 6. In this case, the guard portion 6 can be easily inserted between the inner tube 11 and the surface layer portion 12 of the laminated pipe 10.

  Moreover, in this embodiment, the guard part 6 is flat plate shape extended from the base 2, Comprising: The longitudinal cross-sectional shape is circular arc shape which protrudes toward the outer edge side of the base 2, as shown to Fig.2 (a). It is the shape. In this case, when the cutter 1 is rotated in the circumferential direction R of the laminated pipe 10, the guard portion 6 is easily rotated between the inner tube 11 and the surface layer portion 12 of the laminated pipe 10. However, the longitudinal cross-sectional shape of the guard part 6 is not limited to this. For example, the guard portion 6 may be a round bar having a circular longitudinal section, a flat plate having an elliptical longitudinal section, or the like. That is, the shape of the guard part 6 can be changed as appropriate.

  Next, a method for removing a part of the surface layer portion 12 from the laminated pipe 10 using the cutter 1 will be described.

  Referring to FIG. 1, the first step is a step in which the cutter 1 is pushed into the laminated pipe 10 to align the blade portion 5 with the surface layer portion 12. Specifically, as shown by the arrows in FIG. 1, the guard portion 6 of the cutter 1 is aligned between the inner tube 11 and the surface layer portion 12 of the laminated pipe 10, and the cutter 1 is placed on the longitudinal end face 10 e of the laminated pipe 10. Push in. At this time, the guard portion 6 of the cutter 1 is inserted by scraping between the inner tube 11 and the surface layer portion 12 of the laminated pipe 10 so that the cutter 1 can be pushed into the accommodating portion S. As shown in FIG. 3A, the cutter 1 can be pushed in until the base portion 2 of the cutter 1 comes into contact with the longitudinal end surface 10 e of the laminated pipe 10. In addition, in this embodiment, the space between the inner edge of the arm part 3 on which the blade part 5 is arranged and the inner edge of the arm part 4 on the opposite side across the arm part 3 and the central axis O is shown in FIG. As shown, the dimension is set slightly larger than the diameter of the laminated pipe 10.

  The second step is a step of cutting a part of the surface layer portion 12 of the laminated pipe 10 in the circumferential direction R. Specifically, as shown in FIG. 3B, the arm portion 3 of the cutter 1 is pushed toward the surface layer portion 12 of the laminated pipe 10 in the vicinity of the blade portion 5, and a part of the surface layer portion 12 is cut and cut. Then, the cutter 1 is rotated in the circumferential direction R of the laminated pipe 10.

  Specifically, first, the arm portion 3 of the cutter 1 is pushed toward the surface layer portion 12 of the laminated pipe 10, and the arm portion 3 is bent and deformed around the connection portion with the base portion 2. Thereby, as shown in FIG.3 (b), the blade part 5 of the cutter 1 can cut | disconnect and cut a part of surface layer part 12 of the laminated pipe 10. FIG. In the present embodiment, when the surface layer portion 12 is cut, the outer surface of the inner tube 11 can be prevented from being damaged because it contacts the guard portion 6 even if the blade portion 5 enters deeply. Next, when the cutter 1 is rotated from the state where the cut is made, only the surface layer portion 12 is formed in a cylindrical shape along the circumferential direction R of the laminated pipe 10 at the position of the dimension ΔX from the longitudinal end surface 10e of the laminated pipe 10. Disconnected. In the present embodiment, since the shape of the ridge line 5a of the blade portion 5 is an arc shape, the resistance generated in the blade portion 5 can be reduced. Therefore, the surface layer portion 12 is easily cut along the circumferential direction R of the laminated pipe 10. be able to. Then, after a portion of the surface layer portion 12 is cut into a tubular shape, the cutter 1 is pulled out from the laminated pipe 10 while the arm portion 3 is pushed in, so that the inner portion of the laminated pipe 10 is removed as shown in FIG. Only the tubular surface layer portion 12 can be removed while leaving the tube 11.

  Thus, if the cutter 1 of this embodiment is used, the lengthwise end face 10e of the laminated pipe 10 is brought into contact with the base 2 of the cutter 1 and the cutter 1 is rotated in the circumferential direction R of the laminated pipe 10, Only the surface layer portion 12 can be cut in the circumferential direction R while the inner pipe 11 of the laminated pipe 10 remains. Therefore, according to the cutter 1, the surface layer portion 12 of the laminated pipe 10 can be partially removed while reducing the number of work steps.

  Further, in the conventional skin cutter, when the surface layer portion 12 of the laminated pipe 10 is cut in the circumferential direction, it is necessary to cut along the marking. In the present embodiment, the longitudinal end face 10e of the laminated pipe 10 is cut by the cutter. Since the cutting dimension is defined by contacting the base portion 1 of 1, the marking need not be performed. However, the cutter 1 of this embodiment can also be used without contacting the lengthwise end surface 10 e of the laminated pipe 10 with the base 2 of the cutter 1. Moreover, when the surface layer part 12 with a notch part is removed after forming the notch part along the axial direction in the surface layer part 12 of the laminated pipe 10 as in the past, the axial length of the notch part and the blade part If the position is not completely matched, a cut mark may remain in the surface layer portion 12 remaining in the laminated pipe 10. On the other hand, if the cutter 1 of this embodiment is used, since it is not necessary to form the notch part along the central axis O of the cutter 1, the laminated pipe 10 after removing a part of the surface layer part 12 is used. The surface layer part 12 is excellent in aesthetics.

  Furthermore, in the cutter 1 of the present embodiment, as shown in FIG. 4A, the exposure amount ΔX in the length direction of the inner tube 11 when a part of the surface layer portion 12 is removed from the laminated pipe 10 is the inner tube 11. The blade portion 5 is disposed with respect to the arm portion 3 so as to be equal to the amount of connection with the connection member 20 that connects. In this case, by making the distance ΔX from the base portion 2 to the blade portion 5 equal to the connection allowance of the connecting member 20, it is not necessary to draw a marked line. Thereby, as shown in FIG.4 (b), the laminated pipe 10 can be connected to the connection member 20 without producing a wrinkle.

  Moreover, the cutter 1 of this embodiment has the other arm part 4 extended ahead from the base 2 in addition to the arm part 3, as shown to FIG. 3 (a), (b), These other arms The portion 4 is arranged on the outer side of the surface layer portion 12 of the laminated pipe 10 together with the arm portion 3. In this case, since the cutter 1 can be easily and reliably held by gripping the other arm portion 4, the surface layer portion 12 can be easily cut. In addition, the other arm part 4 may be at least one. When the number of the other arm parts 4 provided in the base part 2 is one, the said arm part 4 can be arrange | positioned in the position on the opposite side to the arm part 3 on both sides of the central axis O. Alternatively, the cutter 1 can omit the arm portion 4 and the guard portion 6. That is, the cutter 1 of the present invention only needs to include at least the base 2, the arm 3, and the blade 5.

  Moreover, it is preferable that the arm part 3 is elastically deformable toward the laminated pipe 10 at least when the surface layer part 12 is cut by the blade part 5 as described above. In this case, the arm portion 3 can be easily pushed toward the surface layer portion 12 of the laminated pipe 10. Specifically, for example, the cutter 1 is made of a general-purpose resin such as polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC), ABS resin (ABS), polyethylene terephthalate (PET), etc. If it comprises synthetic resins, such as other engineering plastics, the arm part 3 can be made flexible. Alternatively, even when the cutter 1 is made of metal or the like, if the arm portion 3 is made thin, the arm portion 3 can be easily pushed toward the surface layer portion 12 of the laminated pipe 10.

  Furthermore, the arm part 3 of the cutter 1 can be provided with an elastic deformation part. The cutter 1 in FIGS. 5A to 5C is provided with a flat spring portion 3 a that is inclined outward from the base portion 2 on the arm portion 3, and the arm portion 3 can be easily moved toward the surface layer portion 12 of the laminated pipe 10. It can be pushed into. Further, the cutter 1 in FIGS. 6A to 6C is provided with a corrugated leaf spring portion 3 b continuous in the length direction of the arm portion 3 on the arm portion 3, and the arm portion 3 is provided on the surface layer portion 12 of the laminated pipe 10. It can be pushed in easily. Even if the arm portion 3 is provided with an elastic deformation portion configured in a geometric shape such as the flat spring portion 3a or the corrugated leaf spring portion 3b, the blade portion 5 is easily pressed against the surface layer portion 12, Cutting of the surface layer portion 12 is facilitated. 5 and 6, the longitudinal cross-sectional shapes of the arm portions 3 and 4 are arcuate toward the inside of the arm portion 3 as shown in FIGS. 5 (a) and 6 (a). It is a protruding shape.

  Furthermore, the blade portion 5 can be easily pushed toward the surface layer portion 12 of the laminated pipe 10 by allowing the blade portion 5 to slide toward the laminated pipe 10 at least when the surface layer portion 12 is cut by the blade portion 5. FIGS. 7A and 7B show a cutter 1 ′ in which a slider 7 is provided on the arm 3 and a blade 5 is disposed on the slider 7. In the cutter 1 ′, the slider 7 is moved from the state shown in FIG. 7A to the state shown in FIG. 7B to move the blade portion 5 toward the laminated pipe 10 (not shown). Can do.

  Specifically, the cutter 1 ′ is obtained by assembling a slider 7 having a blade portion 5 to the main body B separately. The main body B is formed, for example, by bending a punched metal plate. In detail, the base 2 and the arms 3 and 4 are formed by bending a rectangular metal plate sequentially in the longitudinal direction of the metal plate substantially at a right angle. More specifically, the arm portion 4 is formed by bending one end portion of the rectangular metal plate, and a portion separated from the portion connected to the arm portion 4 by a predetermined length is bent in parallel with the arm portion 4. The base 2 and the arm 3 are formed. The guard portion 6 is formed by bending a part of the base portion 2 from the base portion 2 in parallel with the arm portions 3 and 4. In particular, in the present embodiment, overhanging portions 8 that accommodate the laminated pipe 10 together with the arm portions 3 and 4 are formed on both sides of the arm portion 3, respectively. In the present embodiment, each of the overhanging portions 8 forms the accommodating portion S of the laminated pipe 10 together with the arm portions 3 and 4 by bending from the arm portion 3. Thereby, when the end surface 10e in the length direction of the laminated pipe 10 is brought into contact with the contact surface 2a of the base portion 2, the laminated pipe 10 accommodates the laminated pipe 10 surrounded by the arm portions 3 and 4 and the two projecting portions 8. Housed in part S. When the overhanging portion 8 as in the present embodiment is provided, the positional relationship between the blade portion 5 and the laminated pipe 10 does not shift during rotation, so that it is easy to rotate and cutting becomes easy.

  The arm portion 3 is provided with a pedestal portion 9a on which the slider 7 is placed. In addition, guide portions 9b for slidably guiding the side surfaces of the slider 7 are provided on both sides of the pedestal portion 9a. Specifically, the base 9a is formed by bending the other end of the rectangular metal plate to the side opposite to the base 2 side with respect to the arm 3. In the present embodiment, the pedestal portion 9 a is formed as a flat portion that is bent substantially at a right angle to the arm portion 3. Moreover, the guide part 9b is formed by bending from the both sides of the base part 9a. In the present embodiment, the guide portion 9b is formed as a flat portion that is bent substantially at a right angle to the pedestal portion 9a. Thereby, the slider 7 on the pedestal portion 9a is guided to be slidable between the two guide portions 9b. In the present embodiment, the main body B is formed by bending a single metal plate, but the method of forming the main body B is not limited to this.

  Also in this embodiment, when the cutter 1 ′ is pushed from the state of FIG. 7A toward the end surface 10 e in the length direction of the laminated pipe 10, the pushing is performed in the first step in FIG. As described above, the process can be performed until the base 2 of the cutter 1 ′ contacts the end surface 10 e in the length direction of the laminated pipe 10.

  In the second step of cutting a part of the surface layer portion 12 of the laminated pipe 10 in the circumferential direction R, as shown in FIG. 7B, the slider 7 is pushed toward the accommodating portion S side of the laminated pipe 10, After cutting a part of the surface layer part 12 and making a cut, the surface layer part can be easily obtained by rotating the cutter 1 ′ in the circumferential direction R of the laminated pipe 10 as described with reference to FIG. 12 can be cut in the circumferential direction of the laminated pipe 10. Next, if the cutter 1 ′ is pulled out from the laminated pipe 10 while the slider 7 is pushed in, only the cylindrical surface layer portion 12 is removed while leaving the inner pipe 11 of the laminated pipe 10 as shown in FIG. Can be removed.

Further, the cutter 1 ′ shown in FIG. 7 can be provided with a shaft portion (shaft portion) into which the laminated pipe 10 can be inserted into the base portion 2. FIGS. 8A and 8B show a cutter 1 ′ having a cylindrical shaft portion 30 as a modification of the cutter 1 ′ shown in FIG. As shown in FIG. 8A, the shaft portion 30 extends from the contact surface 2 a of the base portion 2 in parallel with the arm portions 3 and 4. As shown in FIG. 8B, the outer diameter dimension of the shaft portion 30 is defined so as to be accommodated in a through hole (internal passage of the laminated pipe 10) A ₁₀ formed in the inner pipe 11 of the laminated pipe 10. ing. As a specific example, the outer diameter of the shaft portion 30 is preferably an inner diameter the same or smaller diameter than that of the through hole A _10. As a result, when the cutter 1 ′ is pushed into the laminated pipe 10, the shaft portion 30 functions as a guide for the laminated pipe 10, so that the end face 10 e in the length direction of the laminated pipe 10 is The contact surface 2a can be contacted. That is, by providing the shaft portion 30 in the cutter 1 ′, it is possible to more reliably prevent the positional relationship between the blade portion 5 and the laminated pipe 10 from being shifted during rotation. For this reason, the relative rotation between the cutter 1 ′ and the laminated pipe 10 becomes easier, so that the cutting operation is further facilitated.

  In the present embodiment, the cylindrical shaft portion 30 extends to a position in the axial direction that is the same as the ridge line 5a of the blade portion 5 or exceeds the ridge line 5a. In this case, since the laminated pipe 10 can hold the force received from the blade portion 5 at the time of cutting, the cutting operation is further facilitated. However, the length of the shaft portion 30 can be changed as appropriate according to the specifications of the cutter 1 ′ and the like.

Moreover, in this embodiment, the shaft part 30 can be slid with respect to the contact surface 2a. Specifically, the shaft part 30 can slide between the arm part 3 and the arm part 4 along the opening A ₁ formed in the base part 2.

In this embodiment, as shown in FIGS. 8A and 8B, the base 2 has an opening A ₁ penetrating through the contact surface 2 a at the portion of the contact surface 2 a and the arm portion 3 and the arm. It is formed in the shape of a long hole (slit) between the part 4. On the other hand, as shown in FIG. 8B, the shaft portion 30 is provided with a slide member 31 that can slide along the opening A ₁ formed in the base portion 2. In the present embodiment, the slide member 31 is constituted by a screw member including a head 31a and a shaft (not shown) on which a screw portion is formed. The slide member 31 is screwed to one end of the shaft portion 30 by the shaft, the shaft extending through the opening A _1. Thereby, the shaft part 30 can be slid along the opening A ₁ via the slide member 31. Further, since the mounting position of the shaft portion 30 can be changed according to the thickness of the laminated pipe 10, the guard 6 provided on the base portion 2 is placed between the inner tube 11 and the surface layer portion 12 of the laminated pipe 10. Can be inserted easily.

In the present embodiment, the head 31a functions as a retaining member for the shaft portion 30 is falling off from the opening A _1. In particular, in this embodiment, since the slide member 31 is constituted by a screw member, the shaft portion 30 is slid to a suitable position by using a tool T such as a screwdriver as shown in FIG. 8B. Can be fixed later. Moreover, this embodiment can also be used by removing the shaft part 30 by the slide member 31 being comprised by the screw member.

  Moreover, although the external appearance shape of the shaft part 30 can be selected suitably, in this example, the shaft part 30 is formed in the column shape. In this case, smooth relative rotation between the cutter 1 ′ and the laminated pipe 10 can also be realized. However, the external shape of the shaft portion 30 is not limited to a cylindrical shape, and may be a polygonal prism shape, for example. In the present embodiment, the shaft portion 30 can be replaced with ones having various sizes corresponding to the inner diameter of the laminated pipe 10. In this case, there is no need for the operator to carry a plurality of cutters.

  Moreover, the shaft part 30 is not restricted to the above-mentioned structure, For example, you may provide integrally with cutter 1 'and may provide it separately by screwing etc. Further, the shaft portion 30 may be provided to be rotatable in the circumferential direction R of the laminated pipe 10 with respect to the base portion 2.

  What has been described above is merely illustrative of one embodiment of the present invention, and various modifications and the like can be made within the scope of the claims. Various shapes can be adopted as the shape of the base 2. Further, in the embodiment of FIG. 1, the portion excluding the blade portion 5 is formed integrally, but the entire cutter 1 including the blade portion 5 can be formed integrally. The material of the main body of the cutter 1 and the blade part 5 is not particularly limited as long as it can function as a cutting tool, such as resin, elastomer, metal, or the like. Moreover, like the arm part 3 shown in the modified example of FIG. 6, the arm part 3 and the like can be appropriately assembled separately. The configurations of the above-described embodiment and its modification examples can be appropriately replaced with each other or combined.

  The present invention can be applied to various cutting tools as long as the cutting tool can partially remove the surface layer portion of the tubular body. For example, the tubular body is not limited to a water supply / hot water supply pipe, and includes a coaxial cable and the like. Further, the usage environment of the tubular body is not limited to residential use.

1 Cutter (cutting tool)
1 'Cutter (cutting tool)
2 base 3 arm 4 arm (other arm)
DESCRIPTION OF SYMBOLS 5 Blade part 5a Ridge line 6 Guard part 7 Slider 8 Overhang part 9a Base part 9b Guide part 10 Laminated pipe (tubular body)
10e Length direction end face 11 Inner pipe 12 Surface layer part 12a Intermediate layer 12b Covering layer 20 Connection part 30 Shaft 31 Slide member 31a Head L Length direction of laminated pipe (length direction of tubular body)
O Center axis of the cutter (base) R Circumferential direction of the laminated pipe (circumferential direction of the tubular body)
Δx Exposure

Claims (7)

A cutting tool capable of cutting the surface layer portion of a tubular body having an inner tube and a surface layer portion covering the inner tube,
A base that can contact the longitudinal end face of the tubular body;
An arm extending forward from the base;
A blade portion that is disposed on the arm portion and is capable of cutting the surface layer portion of the tubular body when rotated in the circumferential direction of the tubular body;
A cutting tool characterized by comprising:   2. The blade according to claim 1, wherein an exposure amount in a length direction of the inner tube when the surface layer portion is removed from the tubular body is equal to a connection amount with a connection member connecting the inner tube. The cutting tool that is in place.   The cutting tool according to claim 1 or 2, wherein the blade portion has an arc shape in a ridge line extending in a cutting direction.   4. The method according to claim 1, wherein the inner tube of the tubular body is protected against the blade portion when the surface layer portion is cut at least by the blade portion extending forward from the base portion. Cutting tool with possible guard part.   The cutting tool according to any one of claims 1 to 4, wherein the arm portion is elastically deformable toward the tubular body at least when the surface layer portion is cut by the blade portion.   The cutting tool according to any one of claims 1 to 5, wherein the blade portion is slidable toward the tubular body at least when the surface layer portion is cut by the blade portion.   The cutting tool according to claim 1, further comprising another arm portion that extends forward from the base portion.

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