Cutting tool

Abstract

To provide a cutting tool capable of cutting a plurality of types of long objects to be cut.SOLUTION: A cutting tool comprises first and second levers 10 and 20 which are rotatably connected to each other by a rotational axis 1, and whose rear parts are provided as operation parts 12 and 22, a cutting blade 30 disposed on the first lever 10, and a set of a plurality of inserts (receiving pieces). An insert 40 having a support recess 42 corresponding to a diameter of a composite tube 100 (an object to be cut) is selected to be detachably and replaceably fixed to a receiving part 24 of the second lever 20. A fitting recess 25 matching an outer shape of the insert 40 is formed on a side surface of the receiving part 24, and the insert 40 is fitted into the fitting recess 25 to be fixed to the receiving part 24 with a fixing screw 49. The composite tube 100 is cut by the cutting blade 30 in a state of setting the composite tube 100 to the support recess 42 of the insert 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cutting tool for cutting a long object to be cut, such as a plastic pipe. [Background technology]

[0002] A cutting tool for cutting a long object such as a plastic pipe includes a first and second lever rotatably connected to each other, and a cutting blade provided on the first lever. The second lever is provided with a receiving portion, and a support recess that is open upward is formed in the receiving portion. With the object set in the support recess, the operating portions of the first and second levers are closed so as to move closer to each other, causing the cutting blade to cut the object.

[0003] In typical cutting tools, the support recess is semicircular, so good cutting is possible when cutting an object with a diameter corresponding to this support recess, but when cutting an object with a smaller diameter, the support becomes unstable and good cutting is not possible. In the cutting tool of Patent Document 1, the support recess has a complex shape so as to be able to cut a plurality of cutting objects having different diameters and / or shapes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4430916 Summary of the Invention [Problem to be solved by the invention]

[0005] In the cutting tool of Patent Document 1, the support location in the support recess is changed depending on the object to be cut, so there is a limit to how stably the object to be cut can be supported. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a cutting tool comprising first and second levers rotatably connected to each other by a rotating shaft and having rear portions provided as operating parts, and a cutting blade provided on the first lever, in which an object to be cut is received by a receiving part provided on the second lever and cut by the cutting blade by bringing the operating parts of the first and second levers closer to each other, A receiving piece is detachably fixed to the receiving portion, and a support recess for supporting the object to be cut is formed in the receiving piece. According to this configuration, the support recess of the receiving piece can be selected according to the object to be cut, so that the object to be cut can be stably set in the support recess, enabling good cutting.

[0007] In one embodiment, a set including a plurality of the receiving pieces having different sizes and / or shapes of the support recesses is provided, and one of the receiving pieces selected from the set is fixed to the receiving portion.

[0008] In another aspect, the support recesses having different sizes and / or shapes are formed at both ends of the receiving piece, and the support recess at a selected end is provided to support the cutting target when the receiving piece is fixed to the receiving part. In this aspect, a set including a plurality of receiving pieces may be provided.

[0009] Preferably, a first fitting portion is formed on the receiving portion, a second fitting portion is formed on the receiving piece, and the first fitting portion and the second fitting portion are fitted together. According to this configuration, the load applied to the receiving piece during cutting can be received by the receiving portion of the second lever via the fitting portion.

[0010] Preferably, the first fitting portion is a fitting recess, the receiving piece is provided as a nest, and at least a part of the nest is fitted into the fitting recess as the second fitting portion. According to this configuration, the insert can be held more stably.

[0011] Preferably, the fitting recess is formed on at least one side of the receiving portion, a screw hole is formed in the bottom surface of the fitting recess of the receiving portion, and an insertion hole is formed in the insert, and the insert is fixed to the side of the receiving portion by inserting a fixing screw into the insertion hole and screwing it into the screw hole.

[0012] Preferably, a slit through which the cutting blade passes is formed in a center in the rotation axis direction of the receiving portion of the second lever, and the fitting recesses of the same shape are formed on both side surfaces of the receiving portion. According to this configuration, the worker can select one of the left or right fitting recesses depending on whether he is right-handed or left-handed, and fit the insert therein.

[0013] The case where the cutting target is a resin composite pipe used for cold water supply, hot water supply, etc. will be described. The composite pipe comprises an inner pipe and a covering pipe which covers the inner pipe, and the covering pipe is formed with holding protrusions which protrude radially inward and hold the inner pipe approximately coaxially with the covering pipe, spaced apart in the pipe axial direction, and the covering pipe is formed with recesses corresponding to the holding protrusions on its outer circumferential surface. When the composite pipe having the above-mentioned configuration is set in the support recess of a general cutting tool, the cladding pipe rests on the inner circumference of the support recess, and the inner pipe is in a state of floating above the support surface, so that the support of the inner pipe is unstable. Therefore, when the cutting blade hits the composite pipe, the inner pipe tends to shift from the set position and cut at an angle. In the case of the cutting tool for the composite pipe described above, a support protrusion is formed on the inner periphery of the support recess of the receiving piece, which fits into the recess of the covering pipe to support the inner pipe. According to this configuration, the inner tube can be stably supported by the support protrusion that fits into the recess in the covering tube of the composite tube, thereby preventing the inner tube from shifting during cutting and allowing the inner tube to be cut well along a cut surface perpendicular to the tube axis.

[0014] When the retaining protrusions of the cladding tube are formed in groups of four, equally spaced circumferentially at predetermined intervals along the tube axial direction, two of the support protrusions are formed circumferentially at 90° intervals and fit into the recesses corresponding to two of the four retaining protrusions.

[0015] When the covering pipe is a corrugated pipe having alternating annular peaks and valleys, and the retaining protrusions protrude radially inward from the valleys, an arc-shaped support rib that fits into a recess corresponding to the valley is formed in an area circumferentially adjacent to the support protrusion on the inner circumference of the support recess of the receiving piece. According to this configuration, since the valley portion is also supported by the supporting ridge, the cladding tube can be stably supported and the cladding tube can be cut well.

[0016] Preferably, semicircular support surfaces for supporting an outer periphery of a ridge portion of the cladding tube are formed on an inner periphery of the support recess of the receiving piece on both sides in the rotation axis direction of the support protrusion and the support ridge. According to this configuration, the crests of the cladding tube are also supported by the supporting surfaces of the receiving pieces, so that the cladding tube can be supported more stably.

[0017] Preferably, further, a movable member is provided at a front end of the receiving portion of the second lever, the movable member being rotatable in the front-rear direction and configured to hold a rotation target held in the support recess. According to this configuration, the movable member presses the cutting object set in the support recess from the front, so that the composite pipe can be prevented from jumping around immediately after cutting. Effect of the Invention

[0018] According to the present invention, by using the receiving piece that is detachably fixed to the receiving portion of the second lever, the object to be cut can be supported in the supporting recess that is optimal for the object to be cut, and good cutting can be performed. [Brief description of the drawings]

[0019] [Figure 1] 1 is a side view of a cutting tool according to a first embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] 11 is an enlarged side view of a main portion of the cutting tool, showing a state in which the insert has been removed from a receiving portion of a second lever of the cutting tool. FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] 10(A) to 10(D) are side views showing a part of a nesting set consisting of a plurality of nesting members, with insertion holes and screw holes omitted. [Figure 8] FIG. 2 is an enlarged cross-sectional view of the composite pipe to be cut. [Figure 9] 9 is a vertical cross-sectional view taken along line IX-IX of FIG. 8. [Figure 10] 4 is an enlarged cross-sectional view of a main portion showing a state in which a composite pipe is set in a support recess of a insert. FIG. [Figure 11] 11 is a cross-sectional view taken along the line XI-XI in FIG. [Figure 12] 13(A) and 13(B) are side views showing a part of a nesting set used in a cutting tool according to a second embodiment of the present invention, in which insertion holes and screw holes are omitted. [Figure 13] 13(A) and 13(B) are side views showing a part of a nesting set used in a cutting tool according to a third embodiment of the present invention, in which insertion holes and screw holes are omitted. [Figure 14] FIG. 10 is a side view of a cutting tool according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A cutting tool according to a first embodiment of the present invention will be described below with reference to FIGS. <Composite pipe structure> Prior to describing the cutting tool, the composite resin pipe for cold and hot water supply to be cut will be described with reference to Figures 8 and 9. The composite pipe 100 has an inner pipe 110 and a covering pipe 120 that covers the inner pipe 110. The inner pipe 110 is made of a flexible resin pipe such as a cross-linked polyethylene pipe, a polybutene pipe, a polypropylene pipe, or a polyethylene pipe, and the covering pipe 120 is made of a resin (soft resin) such as low-foamed polyethylene with an expansion ratio of 1.25 to 4.0.

[0021] The cladding tube 120 is made of a corrugated tube, and has annular peaks 121 (large diameter portions) and annular valleys 122 (small diameter portions) alternately arranged in the axial direction, forming a corrugated cross section. The cladding tube 120 further has holding protrusions 125 protruding radially inward from the valleys 122 at predetermined intervals (longer than the pitch of the corrugations, for example, at intervals of 50 mm to 100 mm). In this embodiment, four holding protrusions 125 are formed at equal intervals (90° intervals) in the circumferential direction, and are formed so as to occupy one valley 122 and a part of the peaks 121 on both sides of it in the axial direction. The holding protrusion 125 has a gentle mountain shape when viewed from the tube axis direction as shown in FIG. 8, and as shown in FIG. 9, the axial width gradually decreases toward the tip (toward the radial center).

[0022] The tips of the holding protrusions 125 are in contact with or close to the inner tube 110 at a small distance. These holding protrusions 125 hold the inner tube 110 approximately coaxially with the cladding tube 120, and ensure an air layer between the cladding tube 120 and the inner tube 110, improving the heat retention function. When the cladding tube 120 is viewed from the outside, depressions 125x corresponding to the holding protrusions 125 are formed on the outer circumferential surface of the cladding tube 120.

[0023] <Outline of cutting tool configuration> As shown in Fig. 1, the cutting tool includes a first lever 10, a second lever 20, and a cutting blade 30. A front end of the first lever 10 and an intermediate portion of the second lever 20 are provided as connecting portions 11, 21, respectively. A receiving hole 21a is formed in the connecting portion 21 of the second lever 20, and the connecting portion 11 of the first lever 10 is received in this receiving hole 21a. The first lever 10 and the second lever 20 are rotatably connected by a rotating shaft 1 that passes through the connecting portions 11, 21. The rear portions of the first lever 10 and the second lever 20 are provided as operating parts 12, 22 to be grasped by hand to open and close the lever. Although not shown, the operating parts 12, 22 are biased in the opening direction by a spring, and are prevented from opening beyond a predetermined opening angle by a restricting means.

[0024] An attachment slit (not shown) is formed in the center of the thickness direction (direction of the rotation axis 1) of the connecting part 11 of the first lever 10, and an end of the cutting blade 30 is inserted and fixed into this attachment slit. The cutting blade 30 extends forward along the longitudinal direction of the operating part 12 of the first lever 10.

[0025] The second lever 20 has a receiving portion 24 that extends linearly forward from the front wall 21b of the connecting portion 21 along the longitudinal direction of the operating portion 22. A slit (not shown) through which the cutting blade 30 passes is formed in the front wall 21b. As shown in Fig. 3, the receiving portion 24 has a vertically long rectangular cross section, and a slit 24a that is continuous with the slit in the front wall 21b and receives the cutting blade 30 is formed in the center of the receiving portion 24 in the thickness direction (the direction of the rotation axis 1, the left-right direction).

[0026] <Nested set> 7(A) and (B), the cutting tool of this embodiment is further equipped with a nesting set consisting of multiple types of nests 40 (receiving pieces). One selected nesting piece 40 from the nesting set is fixed to the receiving portion 24 of the second lever 20 in a detachable and replaceable manner.

[0027] <Nested structure> The following description will be given taking the insert 40 in Fig. 7(A) as an example with reference to Fig. 5 and Fig. 6. The insert 40 is made of a flat plate having a rectangular side shape, and has engaging protrusions 41 on the front and rear end faces, as well as a semicircular support recess 42 that is open on the upper side.

[0028] Two support protrusions 43 are formed on the inner circumference of the support recess 42 of the insert 40, at the center in the width direction (the direction of the rotation axis 1; left-right direction). These support protrusions 43 are spaced apart from the bottom of the support recess 42 by the same angle (45°) in the circumferential direction. In other words, the two support protrusions 43 are spaced apart from each other by 90° in the circumferential direction. The support protrusions 43 have a shape substantially equal to that of the depression 125x of the cladding tube 120 of the composite tube 100 described above.

[0029] In the center of the inner circumference of the support recess 42 in the width direction, an arc-shaped support rib 44 is formed, which is divided into three by the support protrusion 43. That is, the support protrusions 43 and the support ribs 44 are formed alternately and continuously in the circumferential direction. The cross-sectional shape of this support rib 44 is approximately equal to the cross-sectional shape of the annular depression corresponding to the valley portion 122 of the cladding tube 120, and its diameter is approximately equal to the diameter of the valley portion 122. Furthermore, semicircular support surfaces 45 are formed on both sides of the inner circumference of the support recess 42 in the width direction. The diameter of this support surface 45 is approximately equal to the outer diameter of the peak portion 121 of the cladding tube 120. The insert 40 has a pair of front and rear countersunk holes 46 (insertion holes) and a central screw hole 47 formed in the lower portion thereof.

[0030] 7(A) and (B), the inserts 40 of the insert set have the same external shape, and differ only in the support recess 42. For example, the insert 40 in Fig. 7(B) has a smaller inner diameter of the support recess 42 than the insert 40 in Fig. 7(A), and has a support protrusion 43, a support ridge 44, and a support surface 45 that are compatible with the composite pipe 100 having a smaller diameter.

[0031] <Configuration of Receiving Portion 24 of Second Lever 20> The receiving portion 24 of the second lever 20 is configured to detachably and replaceably receive the insert 40. As shown in Figs. 2 to 4, fitting recesses 25 (first fitting portions) of the same shape are formed on both the left and right side surfaces of the receiving portion 24 of the second lever 20. The side shape of the fitting recess 25 is rectangular matching the side shape of the insert 40, and engagement recesses 26 are formed on the front and rear end surfaces. The depth of the fitting recess 25 is approximately equal to the thickness of the insert 40, and a pair of front and rear screw holes 27 are formed on the bottom surface.

[0032] The second lever 20 has a semicircular receiving recess 28 that is open at the top. The receiving recess 28 is larger than the support recess 42 of the insert 40 so as not to get in the way when the compound pipe 100, which will be described later, is set.

[0033] <Fixing nesting> From the set of inserts 40 exemplified in Figs. 7(A) and (B), a insert 40 that approximately matches the diameter of the compound pipe 100 to be cut is selected and fixed to the receiving portion 24 of the second lever 20. If the operator is left-handed, the selected insert 40 is fitted into the fitting recess 25 on the left side as shown in Figs. 1 to 3, and if the operator is right-handed, the insert 40 is fitted into the fitting recess 25 on the right side. In this embodiment, almost the entire insert 40 is provided as a fitting portion (second fitting portion) that fits into the fitting recess 25. In this fitted state, the engaging protrusion 41 of the insert 40 is engaged with the engaging recess 26 of the fitting recess 25, the side surface of the insert 40 and the side surface of the receiving portion 24 are flush with each other, and the countersink 46 of the insert 40 and the screw hole 27 of the fitting recess 25 are arranged on the same axis. Finally, the flat head screw 49 (fixing screw) is passed through the countersunk hole 46 and screwed into the screw hole 27, thereby fixing the insert 40 in place.

[0034] <Cutting tool action> The process of cutting the compound pipe 100 using the cutting tool having the above-mentioned configuration will be described. As shown in FIG. 1, the compound pipe 100 is set in the support recess 42 of the insert 40 fixed to the receiving portion 24 of the second lever 20 of the cutting tool. This set state will be described in detail with reference to FIG. 10 and FIG. 11. The two support protrusions 43 of the insert 40 enter into the recesses 125x corresponding to the two holding protrusions 125 of the lower half of the compound pipe 100. The inner pipe 110 is firmly held by the two support protrusions 43 of the insert 40 via the holding protrusions 125 of the covering pipe 120. At the same time, the support ridges 44 enter into the recesses corresponding to the portions of the lower half of the valley portion 122 of the covering pipe 120 where the holding protrusions 125 are not formed, and support the valley portion 122. Furthermore, the support surface 45 of the insert 40 supports the lower half of the outer periphery of the peak portion 121.

[0035] If the operator is left-handed, the operator holds the cutting tool in the left hand and the compound pipe 100 in the right hand with the core 40 fitted and fixed in the fitting recess 25 on the left side of the receiving part 24 of the second lever 20, and sets the compound pipe 100 in the support recess 42 of the core 40 as described above. Next, the operator operates the operating parts 12, 22 to move closer to each other, causing the cutting blade 30 to rotate and enter the slit 24a of the receiving part 24, cutting the compound pipe 100. The cutting surface (the movement path of the cutting blade 30) is indicated by the symbol S in FIG. 11. Preferably, the cutting is performed in the vicinity of the valley 122 supported by the core 40, and more preferably at the valley 122 immediately adjacent thereto.

[0036] As described above, the inner pipe 110 of the compound pipe 100 is firmly held by the two support protrusions 43, so that the inner pipe 110 can be well cut at the cutting surface S perpendicular to its axis. Moreover, the support ridges 44 support the valley portions 122 where the holding protrusions 125 are formed, and the support surfaces 45 support parts of the two adjacent peak portions 121, so that the cladding pipe 120 can be stably held and well cut.

[0037] If the operator is right-handed, the operator fits and fixes the insert 40 in the fitting recess 25 on the right side of the receiving portion 24 of the second lever 20, holds the cutting tool in the right hand, grasps the composite pipe 100 with the left hand, and performs the cutting operation in the same manner as described above.

[0038] <Nesting exchange> When cutting a composite pipe 100 with a different diameter, it is necessary to replace the insert 40. In this case, the flat head screw 49 is loosened and the insert 40 is removed from the fitting recess 25 of the receiving portion 24 of the second lever 20. If the insert 40 is tightly fitted into the fitting recess 25, the insert 40 can be removed by screwing a bolt (not shown) into the screw hole 48 of the insert 40 and pressing the bottom surface of the fitting recess 25 with the tip of the bolt. After removing the insert 40, a insert 40 corresponding to a compound pipe 100 of a different diameter, for example, the insert 40 shown in Fig. 7(B), is fitted into the fitting recess 25 and fixed with a flat head screw 49. Thereafter, cutting of the compound pipe 100 is performed in the same manner.

[0039] The insert set of this embodiment may be equipped with a plurality of inserts 140 as exemplified in Figures 11(C) and (D). This insert 140 has the same external shape as the insert shown in Figures 11(A) and (B), but the inner periphery of the support recess 142 forms a semi-cylindrical surface and does not have a support protrusion or a support ridge. The inserts 140 are used, like general cutting tools, when cutting, for example, a resin pipe made of a single pipe. An insert 140 having a support recess 142 according to the diameter is selected, fitted into the fitting recess 25 of the receiving part 24, and fixed with a flat head screw 49.

[0040] Next, another embodiment of the present invention will be described. In the following description, components corresponding to those in the preceding embodiment are designated by the same reference numerals and detailed description thereof will be omitted. The cutting tool of the second embodiment is equipped with a nesting set as shown in Figures 12(A) and (B). The outer shapes of the nests 240 of these nesting sets are the same. Although not shown, the fitting recess of the receiving part of the second lever has a shape corresponding to the outer shapes of these nests 240.

[0041] One end of each insert 240 is formed with a support recess 42 having a support protrusion 43, a support ridge 44, and a support surface 45, and the other end is formed with a support recess 142 whose inner peripheral surface forms a semicircular arc surface. The inner diameters of the support recesses 42, 142 are the same. The inserts 240 in Figures 12(A) and 12(B) have different inner diameters of the support recesses 42, 142. When cutting a composite pipe having a corrugated covering pipe with holding protrusions 125 and depressions 125x formed on the outer circumferential surface, the insert 240 is fitted into the fitting recess 25 of the receiving part 24 with the end with the support recess 42 facing up and fixed with the countersunk screw 49. When cutting a single pipe, for example, the insert 240 is fitted into the fitting recess 25 of the receiving part 25 with the end with the support recess 142 facing up and fixed.

[0042] The cutting tool of the third embodiment is equipped with a nesting set including one or more nesting pieces 340 as exemplified in Fig. 13(A). The nesting pieces 340 have support recesses 42 of different sizes at both ends. Furthermore, the nesting set may include one or more nesting pieces 440 as exemplified in Fig. 13(B). The nesting pieces 440 have support recesses 142 of different sizes at both ends.

[0043] The cutting tool of the fourth embodiment shown in Fig. 14 is equipped with a movable member 50 rotatably connected to the front end of the receiving part 24. The movable member 50 has a U-shaped base 51 and a pair of elongated pressing parts 52 that are connected to a pair of upright walls of the base 51 and face each other in parallel. A slit (not shown) through which the cutting blade 30 passes is formed between the pair of pressing parts 52. The pair of upright walls of the base 51 are aligned along both side surfaces of the receiving part 24, and a support shaft 2 parallel to the rotation shaft 1 is inserted through these upright walls and the receiving part 24, whereby the movable member 50 is connected to the receiving part 24 rotatably in the front-rear direction.

[0044] After the cutting target such as the compound pipe 100 is set in the support recess 42 of the insert 40, the movable member 50 is rotated backward with the hand holding the compound pipe 100, and the outer circumferential surface of the compound pipe 100 is pressed by the pair of pressing parts 52. At this time, the covering pipe 120 may be crushed, and the inner pipe 110 may be pressed through the covering pipe 120.

[0045] Next, the first lever 10 and the second lever 20 are closed to rotate the cutting blade 30. The cutting blade 30 passes through a slit in the front wall 22b of the second lever 20 and a slit in the movable member 50 to reach the compound pipe 100 and cut the compound pipe 100. Since the compound pipe 100 is held down by the holding member 50, it is possible to prevent the compound pipe 100 from bouncing back elastically immediately after cutting. When the movable member 50 is pressed against the compound pipe 100 by a finger, a protruding pressing tab may be provided on the movable member 40. The pressing surface of the movable member may not be flat but may be curved or bent. The pressing portion of the movable member may be disposed on only one side of the movement path of the cutting blade.

[0046] In the above-described cutting tool, the movable member 50 is maintained pressed against the composite pipe 100 by the fingers during cutting, but the pressed state of the movable member 50 may be maintained by a maintaining means 55 provided on the receiving portion 24 of the second lever 20 as shown by imaginary lines in Fig. 14. This maintaining means 55 may include a spring such as a torsion spring that constantly urges the movable member 50 to rotate backward. For example, a torsion spring is wound around the protruding end of the support shaft 2, one end of which is engaged with the receiving portion 24, and the other end of which is engaged with the base portion 51 of the movable member 50. With the movable member 50 rotated forward against the spring, the composite pipe 100 is set in the support recess 42, and then when the movable member 50 is released, the spring force causes the movable member 50 to press against the composite pipe 100, thereby maintaining this set state.

[0047] The maintaining means 55 may be a friction resistance imparting mechanism that imparts friction resistance between the receiving portion 24 of the second lever 20 and the movable member 50. In this case, after the compound pipe 100 is set in the support recess 42, the movable member 50 is rotated backward against the friction resistance of the friction resistance imparting mechanism and pressed against the compound pipe 100, and then the movable member 50 is released. The movable member 50 maintains its position by the friction resistance. The friction resistance imparting mechanism is configured, for example, by inserting the support shaft 2 into the receiving portion 24 so as not to rotate, fixing support plates to both ends of the support shaft 2, and arranging friction plates and disc springs between the support plates and the side surfaces of the base portion 51 of the movable member 50. A slider may be provided on the receiving portion 24 of the second lever 20 so as to be movable in the front-rear direction, and a movable member may be provided on this slider.

[0048] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In the above embodiment, the receiving piece for cutting the composite pipe has a support protrusion that fits into a recess corresponding to the holding protrusion of the cladding pipe, a support rib that fits into a recess corresponding to the valley portion, and support surfaces on both sides that support the outer periphery of the crest portion, but the support surfaces may be omitted. Also, the support ribs and the support surfaces may be omitted. When the holding protrusion extends continuously in the circumferential direction (for example, when it is annular), the support projection may extend in the circumferential direction and have an arc shape.

[0049] In the embodiment described above, the insert is fitted into the fitting recess of the receiving part and then fixed to the receiving part by a fixing screw. However, the insert may be held down by a spring material instead of a fixing screw to maintain the insert state of the insert.

[0050] The fitting recess of the receiving portion of the second lever may be formed on an upper surface of the receiving portion. Only a part of the insert may be fitted into the fitting recess of the receiving portion of the second lever as the second fitting portion. A fitting recess (second fitting portion) may be formed in the receiving piece, and a protrusion (first fitting portion) that fits into this fitting recess may be formed on a side surface of the receiving part.

[0051] The covering pipe of the composite pipe may be a cylindrical pipe other than a corrugated pipe, may be made of non-foamed resin, may be hard and difficult to deform, may be made of polyethylene foam with a non-foamed layer laminated on the outer periphery, or may be made of a thin-walled corrugated pipe with urethane foam laminated on the inner periphery. The inner pipe and the covering pipe may be made of a resin pipe reinforced by combining with a soft metal pipe. [Industrial Applicability]

[0052] The present invention can be applied to a tool for cutting a long cutting object such as a plastic pipe. [Explanation of symbols]

[0053] 1 Rotation axis 10 First Lever 20 Second Lever 24 Receiving Department 25 Fitting recess (first fitting portion) 27 Screw holes 30 cutting blade 40, 140, 240, 340, 440 Nesting (receiving piece) 42 Support recess 43 Support protrusion 44 Support ridge 45 Support surface 46 Countersink (through hole) 49 Flat head screw (fixing screw) 50 Movable parts 100 Composite pipe (for cutting) 110 Inner tube 120 Cladding tube 121 Yamabe 122 Valley 125 Retaining protrusion 125x recess

Claims

1. A cutting tool comprising first and second levers rotatably connected to each other by a rotating shaft and having rear portions provided as operating parts, and a cutting blade provided on the first lever, wherein a cutting object is cut by the cutting blade while being received by a receiving part provided on the second lever by bringing the operating parts of the first and second levers closer to each other, A cutting tool, comprising: a receiving piece removably fixed to the receiving portion; and a support recess formed in the receiving piece for supporting the object to be cut.

2. The cutting tool according to claim 1, characterized in that a set including a plurality of receiving pieces having different sizes and / or shapes of the support recesses is provided, and one selected receiving piece from the set is fixed to the receiving portion.

3. The cutting tool according to claim 1, characterized in that the support recesses of different sizes and / or shapes are formed at both ends of the receiving piece, and when the receiving piece is fixed to the receiving piece, the support recess at a selected end is provided to support the object to be cut.

4. The cutting tool according to any one of claims 1 to 3, characterized in that a first fitting portion is formed on the receiving portion, a second fitting portion is formed on the receiving piece, and the first fitting portion and the second fitting portion fit together.

5. The cutting tool according to claim 4, wherein the first fitting portion is a fitting recess, the receiving piece is provided as a nest, and at least a portion of the nest is fitted into the fitting recess as the second fitting portion.

6. The cutting tool according to claim 5, characterized in that the fitting recess is formed on at least one side of the receiving portion, a screw hole is formed on a bottom surface of the fitting recess of the receiving portion, and an insertion hole is formed in the insert, and the insert is fixed to the side of the receiving portion by inserting a fixing screw into the insertion hole and screwing it into the screw hole.

7. The cutting tool according to claim 5, characterized in that a slit through which the cutting blade passes is formed in the center of the receiving portion of the second lever in the rotation axis direction, and the fitting recesses of the same shape are formed on both side surfaces of the receiving portion.

8. the cutting target is a composite pipe made of resin, the composite pipe includes an inner pipe and a cladding pipe covering the inner pipe, the cladding pipe is formed with holding protrusions protruding radially inward and holding the inner pipe approximately coaxially with the cladding pipe, the holding protrusions being spaced apart in the pipe axial direction, and the cladding pipe is formed with recesses corresponding to the holding protrusions on its outer circumferential surface, 4. The cutting tool according to claim 1, wherein a support protrusion is formed on an inner periphery of the support recess of the receiving piece so as to fit into the recess of the covering tube and support the inner tube.

9. the cladding tube has four holding protrusions formed at predetermined intervals along the tube axis and at equal intervals in the circumferential direction; The cutting tool according to claim 8, characterized in that two of the support projections are formed at 90° intervals in the circumferential direction and fit into the recesses corresponding to two of the four holding protrusions.

10. the covering pipe is a corrugated pipe having annular crests and annular valleys alternately, the holding protrusions protrude radially inward from the valleys, The cutting tool according to claim 9, characterized in that an arc-shaped support protrusion that fits into a depression corresponding to the valley portion is formed in an area circumferentially adjacent to the support protrusion on the inner circumference of the support recess of the receiving piece.

11. 11. The cutting tool according to claim 10, characterized in that a semicircular support surface for supporting an outer periphery of a ridge portion of the cladding tube is formed on an inner periphery of the support recess of the receiving piece on both sides of the support protrusion and the support rib in the rotation axis direction.

12. The cutting tool according to claim 1, further comprising a movable member at a front end of the receiving portion of the second lever, the movable member being rotatable in the forward and backward directions and configured to press a rotating object held in the support recess.

Images