JP2016034695A - Pipe cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe cutter which can excellently cut a pipe having a three-layer structure with a soft layer and a hard layer mixed in a state of holding a circular cut surface.SOLUTION: A pipe cutter 10 cuts a pipe having a three-layer structure with a soft layer and a hard layer mixed, and includes: a main body part 20; a roller 26 which is arranged on the main body part 20 and is abutted on an outer peripheral surface of the pipe in cutting the pipe; and a disc-like cutting blade 12 which is abutted on the outer peripheral surface of the pipe to cut the pipe, and includes a support part 12a rotatably supported with respect to the main body part 20, a cutting part 12b extending from the support part 12a with a certain thickness to an outer side, and a blade edge part 12c which forms a blade edge of the cutting blade 12 and has a cross section of an isosceles triangle shape. A thickness of the cutting part 12b is in a range of 1.0-1.2 mm, and a tip end angle of the blade edge part 12c is in a range of 20°-30°.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe cutter for cutting a pipe having a three-layer structure in which a soft layer and a hard layer are mixed.

  2. Description of the Related Art Conventionally, a pipe cutter for cutting a metal or resin pipe having a roller provided in the main body and a disk-shaped cutting blade that is rotatably supported with respect to the main body is known. ing. This type of pipe cutter is capable of cutting the pipe with the cutting blade by bringing the roller and the cutting blade into contact with the outer peripheral surface of the pipe to be cut and rotating the pipe cutter around the central axis of the pipe. it can. This type of pipe cutter is disclosed in Patent Document 1, for example.

JP 2007-98545 A

  By the way, a pipe cutter as disclosed in Patent Document 1 is usually used for cutting a pipe composed of a single layer. On the other hand, the pipe used as piping of an air conditioner etc., for example, is often a three-layered structure in which a soft layer and a hard layer are mixed, and is often cut using a saw. However, when a pipe having a three-layer structure in which such a soft layer and a hard layer are mixed is cut with a saw, the outer peripheral surface of the pipe is cut while being compressed with the saw, so the soft layer is cut. The amount of deformation of the cut surface at that time is large, and it is difficult to make the cut surface into a perfect circle.

  Further, when a pipe having a three-layer structure in which a soft layer and a hard layer are mixed is cut using a conventional pipe cutter as disclosed in Patent Document 1, if the cutting blade is too thick, the soft layer Since the cutting blade compresses the soft layer when cutting, the amount of deformation of the cut surface is large. On the other hand, when the thickness of the cutting blade is reduced, the cutting blade is not provided when the hard layer is cut, and blade spillage is likely to occur. As described above, in the conventional pipe cutter, it has been difficult to cut well a pipe having a three-layer structure in which a soft layer and a hard layer are mixed.

  The technology disclosed in this specification has been created in view of the above problems. An object of the technology disclosed in the present specification is to provide a pipe cutter that can cut a three-layer pipe in which a soft layer and a hard layer are mixed while maintaining a circular cut surface.

  The technology disclosed in this specification is a pipe cutter for cutting a pipe having a three-layer structure in which a soft layer and a hard layer are mixed, and is provided in the main body and the main body, and the pipe is cut. A roller that is in contact with the outer peripheral surface of the pipe and a disk-shaped cutting blade that is in contact with the outer peripheral surface of the pipe and cuts the pipe, and is rotatably supported with respect to the main body. A cutting blade having a support portion that is formed, a cutting portion that extends outward from the support portion with a certain thickness, and a blade tip portion that forms a cutting edge of the cutting blade and whose cross section is an isosceles triangle. In the cutting blade, the thickness of the cutting portion is in the range of 1.0 mm to 1.2 mm, and the angle of the tip of the cutting edge portion is in the range of 20 ° to 30 °. The present invention relates to a pipe cutter.

  In a pipe cutter, if the thickness of the cutting blade is too large, the contact area between the cutting blade and the layer increases when the soft layer of the pipe is cut, so the amount of deformation of the cutting surface that deforms following the cutting blade It is difficult to cut the pipe while holding the cut surface in a perfect circle. Moreover, it cannot cut into the soft layer of a pipe depending on the shape and angle of the cutting edge of the cutting blade. On the other hand, if the thickness of the cutting blade or the angle of the cutting edge is too small, the cutting blade may not be provided when cutting the hard layer of the pipe, and blade spilling may occur. In the pipe cutter described above, the cross-sectional shape of the blade edge portion is an isosceles triangle shape, and the angle of the tip of the blade edge portion is an angle in the range of 20 ° to 30 °. The cutting blade can be cut. Moreover, when the thickness of the cut portion is 1.2 mm or less, the amount of deformation of the cut surface that deforms following the cutting blade when the soft layer is cut can be suppressed. Furthermore, when the thickness of the cutting part is 1.0 mm or more and the angle of the tip of the blade edge part is an angle within the range of 20 ° to 30 °, blade spills or the like when cutting the hard layer of the pipe Can be prevented or suppressed. As described above, in the above-mentioned pipe cutter, the thickness of the cutting portion, the shape of the cutting edge portion, and the angle of the cutting blade are optimal configurations and values for cutting a three-layer pipe in which a soft layer and a hard layer are mixed. It is said that. For this reason, a pipe having a three-layer structure in which a soft layer and a hard layer are mixed can be cut with a small amount of deformation, and as a result, can be cut well with a circular cut surface being held. In addition, the pipe of the three-layer structure in which the soft layer and the hard layer are mixed in the present specification refers to a pipe having a three-layer structure including only the soft layer and the hard layer. The lower limit of 20 ° and the upper limit of 30 ° each include a tolerance range (see below).

  The cutting blade may have an angle within a tolerance of 30 ° at the tip of the cutting edge. In addition, the angle within the tolerance referred to in this specification refers to a general tolerance when the angle of the tip of the blade edge portion is adjusted by polishing, for example, and specifically refers to a range within ± 20 minutes.

  If the angle of the tip of the blade tip is within a tolerance of 30 °, the tip of the blade tip is excellent in durability, and therefore, when the hard layer of the pipe is cut, blade spillage occurs. This can be effectively prevented. According to the above configuration, the angle of the tip of the blade tip is provided with an excellent angle when cutting the hard layer of the pipe while allowing the cutting blade to be cut into the soft layer of the pipe. be able to.

  In the cutting blade, an angle of a tip of the blade edge portion may be an angle within a tolerance of 22.6 °.

  If the angle of the tip of the cutting edge is within the tolerance of 22.6 °, the cutting edge can be cut very well into the soft layer of the pipe and the hard layer of the pipe is cut. It is possible to effectively prevent the occurrence of blade spilling. According to the above configuration, the angle of the tip of the cutting edge is provided with an optimum angle that combines the ease of cutting of the cutting edge into the soft layer of the pipe and the durability of the cutting edge when cutting the hard layer of the pipe. can do.

  The main body includes a fixed portion provided with the roller, a shaft portion fixed to the fixed portion and extending in an axial shape, and is movable relative to the shaft portion in the axial direction thereof. And a movable part provided.

  According to this configuration, the cutting blade in the state in which the roller is first brought into contact with the outer peripheral surface of the pipe by moving the portion of the main body portion where the cutting blade is provided, not the portion where the roller is provided. Can be brought into contact with the outer peripheral surface of the pipe. For this reason, when cutting a pipe, it is possible to easily adjust the degree of contact between the cutting edge of the cutting blade and the pipe.

  Provided on the main body part, and restricts at least a part of the cutting part of the cutting blade from moving in the thickness direction, and includes a restriction part having a distance of 0.5 mm or less between the cutting part and the cutting part. May be.

  If the cutting cutter is rotated in the direction around the axis of the pipe while the cutting blade is cut into the soft layer of the pipe, the cutting blade will bite into the soft layer and be pulled and cut as the pipe cutter rotates. The blade may sway in its thickness direction. When the cutting blade is shaken in this way, the cut line formed on the outer peripheral surface of the pipe is shaken, and a straight cut line cannot be put in a shape perpendicular to the extending direction of the pipe, and a good cut surface is obtained. May not be obtained. According to said structure, the cutting blade was cut into the soft layer of the pipe because the distance between the control part provided in the main-body part and the cutting part in the cutting blade was 0.5 mm or less. When the pipe cutter is rotated in the direction around the axis of the pipe in this state, it is well regulated that the cutting blade is deflected in the thickness direction by the regulating portion. For this reason, even when the soft layer of the pipe is cut, it is possible to prevent or suppress the cutting blade from moving with the rotation of the pipe cutter, and to be orthogonal to the extending direction of the pipe. A cut line can be made straight along the outer circumference of the pipe. Thereby, a favorable cut surface can be obtained.

  The cutting blade may be constricted by forming a part of the cutting portion to be recessed.

  According to this configuration, when the pipe is cut, the constricted portion of the cutting portion of the cutting blade escapes from the cutting surface of the pipe, and the stress that the portion receives from the cutting surface is reduced. The frictional resistance generated between the blade and the cutting surface is reduced. For this reason, the cutting blade can be smoothly cut into the soft layer of the pipe, and the cut surfaces of the pipe that has been cut and divided can be made substantially uniform.

  According to the technique disclosed in the present specification, it is possible to provide a pipe cutter that can cut a three-layered pipe in which a soft layer and a hard layer are mixed while maintaining a circular cut surface.

The perspective view of the pipe cutter which concerns on Embodiment 1. FIG. Transparent perspective view of pipe cutter Transparent side view of pipe cutter Front view of pipe cutter Front view of cutting blade Front view with enlarged cutting edge Perspective view of pipe and pipe cutter immediately after starting cutting Perspective view of pipe and pipe cutter in the middle of cutting Expanded sectional view of the cutting edge of the pipe and cutting blade in the middle of cutting the soft layer Enlarged sectional view of the cutting edge of the pipe and cutting blade in the middle of cutting the hard layer The perspective view of the pipe and pipe cutter which concern on Embodiment 2 immediately after a cutting | disconnection start Front view of pipe cutter according to Embodiment 3 12 is an enlarged view of the main part of FIG. Front view of pipe cutter according to Embodiment 4 Main part enlarged view of FIG. Front view of cutting blade of pipe cutter according to Embodiment 5 The front view which expanded the blade edge of the cutting blade shown in FIG. Front view of pipe after cutting Transparent side view of pipe cutter

<Embodiment 1>
The first embodiment will be described with reference to FIGS. As shown in FIG. 1, the pipe cutter 10 according to the first embodiment includes a main body 20, a roller 26 provided on the main body 20, and a disc-shaped cutting blade 12 provided on the main body 20. It is of a size that can be easily carried by the operator. The main body 20 includes a frame-shaped fixed portion 24 disposed on one end side, a frame-shaped movable portion 18 disposed on the other end side, and an axial shaft that connects between the fixed portion 24 and the movable portion 18. Part 22. A part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn in a common direction in each drawing. Of these, the Z-axis direction coincides with the axial direction of the pipe 50 when the pipe cutter 10 is used to cut the pipe 50 (see FIG. 7). Hereinafter, a space sandwiched between the fixed portion 24 and the movable portion 18 is referred to as a cutting space CS.

  The fixing part 24 constituting the main body part 20 is fixed to the shaft part 22. The fixed portion 24 is provided with a cutout portion 24a that is cut out in a circular arc shape at a part thereof. A recess 24b is provided in the cutout 24a. A pair of the rollers 26 are arranged in the concave portion 24b in a line in the Y-axis direction, and are attached so as to be rotatable about an axis along the Z-axis direction. On the other hand, the movable portion 18 constituting the main body portion 20 is attached to the shaft portion 22 so as to be relatively movable in the axial direction (X-axis direction).

  Specifically, as shown in FIGS. 2 and 3, the end portion of the shaft portion 22 on the side attached to the movable portion 18 passes through the movable portion 18, and the tip of the shaft portion 22 extends from the movable portion 18. A mounting plate 15 (see FIG. 3) is mounted in an exposed form. A winding spring 17 is disposed in the movable portion 18 along the direction in which the shaft portion 22 extends. One end of the coil spring 17 is attached to the movable portion 18, and the other end is attached to the attachment plate 15. Accordingly, the movable portion 18 is configured to be urged against the shaft portion 22 by the winding spring 17 via the mounting plate 15.

  In addition, a regulating lever 16 is attached to the outer surface of the movable portion 18. A part of the regulating lever 16 is engaged with the shaft portion 22 in the movable portion 18 by rotating, and thereby the movable portion 18 moves in the direction along the X-axis direction. Is regulated. With the above-described configuration, the operator moves the movable portion 18 relative to the shaft portion 22 along the X-axis direction against the elastic force of the winding spring 17, and uses the restriction lever 16. By fixing the movable portion 18 to the shaft portion 22, the interval between the fixed portion 24 and the movable portion 18 can be adjusted.

  As shown in FIGS. 2 to 4, an adjustment shaft 13 penetrating the movable part 18 is disposed in the movable part 18. A cutting blade support 19 is attached to one end of the adjustment shaft 13 so as to be exposed to the cutting space CS, and an adjustment screw 14 is attached to the other end. The disc-shaped cutting blade 12 is attached to the cutting blade support portion 19 so as to face the pair of rollers 26 and 26 attached to the fixed portion 24 with a predetermined interval. The cutting blade 12 is supported so as to be rotatable about an axis along the Z-axis direction with respect to the cutting blade support portion 19.

  The adjustment screw 14 is attached to the cutting blade support portion 19 via the adjustment shaft 13, and the cutting blade support portion 19 can be moved slowly along the X-axis direction by turning the adjustment screw 14. It has become. Thereby, when performing the cutting operation of the pipe 50, the position of the cutting blade 12 in the X-axis direction can be finely adjusted.

  Next, the configuration of the cutting blade 12 will be described in detail. The disc-shaped cutting blade 12 has a perfect circle shape, is located at the center of the cutting blade 12, and is supported by the cutting blade support portion 19 so as to be rotatable, and outward from the support portion 12a. The cutting portion 12b extends toward the pipe 50 and cut into the pipe 50 when cutting the pipe 50, and the cutting edge portion 12c that forms the cutting edge of the cutting blade 12.

  The cutting part 12b which comprises the cutting blade 12 shall make fixed thickness, as shown in FIG. In the present embodiment, the thickness W1 of the cutting portion 12b is in the range of 1.0 mm to 1.2 mm. On the other hand, as shown in FIG. 6, the blade edge portion 12c constituting the cutting blade 12 has an isosceles triangular cross section, and the angle θ1 of the tip of the blade edge portion 12c is within a tolerance of 30 °. It is an angle. In addition, the angle within the tolerance referred to in the embodiment refers to a general tolerance when the angle of the tip of the blade edge portion is adjusted by polishing, for example, specifically, a range within ± 20 minutes.

  The above is the configuration of the pipe cutter 10 according to the present embodiment, and the operation thereof will be described with reference to FIG. Below, the procedure which an operator performs is demonstrated. When the pipe 50 is cut using the pipe cutter 10 according to the present embodiment, first, the axial direction (Z-axis direction) of the pipe 50 to be cut and the extending direction of the shaft portion 22 constituting the main body portion 20 (X-axis) The pipe cutter 10 is brought close to the pipe 50 to be cut so that the cutting portion of the pipe 50 is disposed in the cutting space CS (see FIG. 1) in a shape orthogonal to the direction). Is brought into contact with the outer peripheral surface 50 a of the pipe 50. At this time, the direction of the rotating shaft of the roller 26 coincides with the axial direction of the pipe 50.

  In addition, as shown in FIG. 7, the pipe 50 illustrated as a cutting target in the present embodiment has a side wall 52 that forms the outer periphery in order from the surface layer side, a vinyl chloride skin layer (an example of a soft layer) 52a, and foamed chloride. The pipe 50 has a three-layer structure including a vinyl layer (an example of a soft layer) 52b and a hard vinyl chloride layer (an example of a hard layer) 52c. Further, the thickness of the side wall 52 of the pipe 50 to be cut and the diameter of the pipe 50 are not limited.

  Next, the movable portion 18 is moved in the extending direction of the shaft portion 22 (X-axis direction), and the tip of the cutting edge portion 12c of the cutting blade 12 is applied to the cutting portion of the pipe 50 while performing fine adjustment with the adjusting screw 14. In this state, the position of the cutting blade 12 is fixed (the state shown in FIG. 7). At this time, the position of the cutting blade 12 is adjusted so that the cutting portion of the pipe 50 is slightly pressed by the cutting blade 12. Here, since the vinyl chloride skin layer 52a which is the surface layer of the pipe 50 is a soft layer, it cannot be cut into the vinyl chloride skin layer 52a depending on the shape of the blade edge portion 12c and the angle of the tip. Specifically, when the angle θ1 of the tip of the blade edge portion 12c is larger than an angle within a tolerance of 30 °, it may be impossible to cut into the vinyl chloride skin layer 52a. On the other hand, in the present embodiment, the cross-sectional shape of the cutting edge portion 12c is an isosceles triangle, and the angle θ1 of the tip is an angle within a tolerance of 30 °, so that the cutting portion of the pipe 50 is pressed. The tip of the blade edge portion 12c thus formed can be cut into the vinyl chloride skin layer 52a.

  Next, the pipe cutter 10 is rotated in the direction around the axis of the pipe 50 (the arrow direction shown in FIG. 7). By rotating the pipe cutter 10 in the direction around the axis of the pipe 50, as shown in FIG. 8, the side wall 52 of the cutting portion of the pipe 50 is cut to a certain depth. In addition, the code | symbol CL shown in FIG. 8 has shown the cut line formed in the cutting | disconnection site | part of the pipe 50 by the pipe cutter 10. FIG. As shown in FIG. 8, when the cutting portion of the pipe 50 is cut to a certain depth, the tip of the cutting edge 12c of the cutting blade 12 is adjusted by finely adjusting the position of the cutting blade 12 in the X-axis direction with an adjusting screw. The pipe 50 is cut to a deeper position. Then, the pipe cutter 10 is again rotated in the direction around the axis of the pipe 50.

  As described above, as the rotation of the pipe cutter 10 in the direction around the axis of the pipe 50 and the adjustment of the position of the cutting blade 12 are repeated, the side wall 52 of the cutting portion of the pipe 50 is cut to a deep position. The side wall 52 of the cutting site of the pipe 50 can be cut.

  Next, a manner of cutting the side wall 52 of the pipe 50 when the pipe 50 is cut using the pipe cutter 10 will be described with reference to FIGS. 9 and 10. Here, FIG. 9 shows an enlarged cross-sectional view of the cutting edges of the pipe 50 and the cutting blade 12 in the middle of cutting the foamed vinyl chloride layer 52b, which is a soft layer, of the side wall 52 of the pipe 50. FIG. 10 shows an enlarged cross-sectional view of the cutting edges of the pipe 50 and the cutting blade 12 in the middle of cutting the hard vinyl chloride layer 52c, which is a hard layer, in the side wall 52 of the pipe 50.

  As shown in FIG. 9, in the middle of cutting the foamed vinyl chloride layer 52b, since the foamed vinyl chloride layer 52b is a soft layer, the foamed vinyl chloride follows the cutting blade 12 being cut to a deep position. The cutting surface 52b1 of the layer 52b is pulled by the cutting blade 12.

  Here, if the thickness W1 (see FIG. 5) of the cutting portion 12b of the cutting blade 12 is too large, the contact area between the cutting blade 12 and the foamed vinyl chloride layer 52b becomes large, and the cut surface 52b1 of the foamed vinyl chloride layer 52b. The amount of deformation is large. As a result, it becomes impossible to cut the foamed vinyl chloride layer 52b. Specifically, if the thickness W1 of the cut portion 12b is greater than 1.2 mm, the deformation amount of the cut surface 52b1 of the foamed vinyl chloride layer 52b is large, and it may be impossible to cut the foamed vinyl chloride layer 52b. On the other hand, in the pipe cutter 10 of the present embodiment, the thickness W1 of the cutting portion 12b of the cutting blade 12 is not too large, specifically 1.2 mm or less, in order to cut such a soft layer. Yes. For this reason, the deformation amount of the cut surface 52b1 of the foamed vinyl chloride layer 52b can be suppressed.

  In addition, depending on the shape and angle of the cutting edge portion 12c of the cutting blade 12, the tip of the cutting edge portion 12c cannot be cut into the foamed vinyl chloride layer 52b when cutting into the foamed vinyl chloride layer 52b as a soft layer. The foamed vinyl chloride layer 52b becomes uncut. On the other hand, in the pipe cutter 10 of the present embodiment, the shape and angle of the cutting edge portion 12c of the cutting blade 12 are set to the optimum configuration and value in order to cut into such a soft layer. For this reason, the front-end | tip of the blade edge | tip part 12c can be cut in the foaming vinyl chloride layer 52b.

  As shown in FIG. 10, in the middle of cutting the hard vinyl chloride layer 52c, since the hard vinyl chloride layer 52c is a hard layer, the cutting surface 52c1 of the hard vinyl chloride layer 52c that is pulled following the cutting blade 12 is removed. The amount of deformation is small.

  Here, if the angle θ1 of the tip of the cutting edge portion 12c in the cutting blade 12 and the thickness W1 (see FIG. 5) of the cutting portion 12b are too small, the strength of the blade is reduced when cutting the hard vinyl chloride layer 52c, which is a hard layer. The blade breaks and the blade spills. Specifically, when the angle θ1 of the tip of the blade edge portion 12c is smaller than an angle within a tolerance of 30 °, or when the thickness W1 of the cutting portion 12b is smaller than 1.0 mm, when cutting the hard vinyl chloride layer 52c. Blade breakage or blade spillage may occur. On the other hand, in the pipe cutter 10 of the present embodiment, the thickness W1 of the cutting portion 12b of the cutting blade 12 is not too small in order to cut such a hard layer, specifically 1.0 mm or more. Yes. For this reason, the hard vinyl chloride layer 52c can be cut without causing the cutting blade 12 to break or spill.

  As described above, in the pipe cutter 10 of the present embodiment, the cutting surfaces 52b1 and 52c1 are cut when any of the foamed vinyl chloride layer 52b that is a soft layer and the hard vinyl chloride layer 52c that is a hard layer is cut. Since the amount of deformation can be suppressed, the cut surface of the pipe 50 after cutting can be held in a perfect circle.

  By the way, in the conventional pipe cutter, if the thickness of the cutting blade is too large, the contact area between the cutting blade and the layer becomes large when cutting the soft layer of the pipe, so the cutting surface deforms following the cutting blade. Therefore, it was difficult to cut the pipe while holding the cut surface in a perfect circle. Moreover, it cannot cut into the soft layer of a pipe depending on the shape and angle of the cutting edge of the cutting blade. On the other hand, if the thickness of the cutting blade or the angle of the cutting edge is too small, the cutting blade may not be provided when cutting the hard layer of the pipe, and blade spillage may occur. On the other hand, in the pipe cutter 10 according to the present embodiment, the cross-sectional shape of the blade edge portion 12c is an isosceles triangle, and the angle θ1 of the tip of the blade edge portion 12c is an angle within a tolerance of 30 °. Thus, the cutting blade 12 can be cut into the soft layer of the pipe 50. Moreover, when the thickness of the cutting part 12b is 1.2 mm or less, when the soft layer of the pipe 50 is cut, the deformation amount of the cutting surfaces 52b1 and 52c1 that deform following the cutting blade 12 is suppressed. Can do. Furthermore, when the thickness of the cutting part 12b is 1.0 mm or more and the angle θ1 of the tip of the cutting edge part 12c is an angle within a tolerance of 30 °, the spillage occurs when cutting the hard layer of the pipe 50. And the like can be prevented or suppressed. As described above, in the pipe cutter 10 of the present embodiment, the thickness of the cutting portion 12b and the shape and angle of the cutting edge portion of the cutting blade 12 are for cutting the pipe 50 having a three-layer structure in which the soft layer and the hard layer are mixed. The optimal configuration and value. For this reason, the pipe 50 having the three-layer structure in which the soft layer and the hard layer are mixed can be cut with a small amount of deformation, and as a result, can be cut well with the circular cut surface being held.

  Here, when the angle of the tip of the cutting edge portion 12c in the cutting blade 12 is changed within an angle range of 18 ° to 32 °, the cutting edge portion 12c can be easily cut into the soft layer of the pipe 50, and the hard layer Table 1 below shows the durability of the cutting edge portion 12c when cutting the plate. In Table 1, three-stage evaluation is shown with ○ being excellent, Δ being good, and × being bad. In addition, the durability in Table 1 refers to the difficulty of occurrence of blade spills when cutting the hard layer. As shown in Table 1, the ease of cutting into the soft layer and the durability when cutting the hard layer are in a trade-off relationship, and the angle of the tip of the blade edge portion 12c is in the range of 20 ° to 30 °. In this case, both ease of cutting into the soft layer and durability when cutting the hard layer can be ensured.

  In particular, when the angle of the tip of the blade edge portion 12c is 30 ° (including within the tolerance) as in the present embodiment, as shown in Table 1, the tip of the blade edge portion 12c is excellent in durability. Therefore, when the hard layer of the pipe 50 is cut, it is possible to effectively prevent blade spills and the like from occurring. As described above, in the pipe cutter 10 of the present embodiment, the cutting blade 12 can be cut into the soft layer of the pipe 50 with respect to the angle of the tip of the cutting edge portion 12c, and the hard layer of the pipe 50 is cut. An angle with excellent durability can be provided.

  Further, in the pipe cutter 10 according to the present embodiment, the main body portion 20 includes the fixed portion 24 provided with the pair of rollers 26, 26, the shaft portion 22 fixed to the fixed portion 24 and extending in an axial shape, and the shaft portion. And a movable part 18 provided with a cutting blade 12 and capable of relative movement in the axial direction. As described above, the portion of the main body 20 that is provided with the cutting blade 12 is moved not on the portion on which the roller 26 is provided, so that the pair of rollers 26 and 26 are moved to the outer peripheral surface 50a of the pipe 50 first. The cutting edge of the cutting blade 12 can be brought into contact with the outer peripheral surface 50 a of the pipe 50 in a state of being in contact. For this reason, when cutting the pipe 50, it is possible to easily adjust the degree to which the cutting edge of the cutting blade 12 contacts the pipe 50.

  Further, the pipe cutter 10 according to the present embodiment is of a size that can be easily carried by an operator. For this reason, in order to cut | disconnect the pipe 50 of the three-layer structure in which a soft layer and a hard layer are mixed, it is not necessary to prepare a big cutting device. By using the pipe cutter according to the present embodiment, the pipe 50 having the three-layer structure in which the soft layer and the hard layer are mixed can be cut well and easily while holding the circular cut surface.

  Further, in the pipe cutter 10 according to the present embodiment, the cutting blade 12 is cut on the outer peripheral surface 50a instead of cutting the outer peripheral surface 50a of the pipe 50 having the three-layer structure in which the soft layer and the hard layer are mixed with the cutting blade 12. Since the pipe 50 can be cut in such a manner that it is inserted, the generation of shavings and burrs associated with the cutting can be prevented or suppressed. For this reason, about the pipe 50 after a cutting | disconnection, the cut surface of a very favorable state can be obtained.

<Embodiment 2>
The second embodiment will be described with reference to FIG. In the second embodiment, a pipe 60 to be cut is different from that in the first embodiment. Since the configuration of the pipe cutter 10 for cutting the pipe 60 is the same as that of the first embodiment, description of the structure, operation, and effect is omitted.

  As shown in FIG. 11, in Embodiment 2, the pipe 60 to be cut by the pipe cutter 10 has a side wall 62 that forms the outer periphery in order from the surface layer side, a polyethylene layer (an example of a soft layer) 62 a, and reinforced aluminum. The pipe 60 has a three-layer structure including a layer (an example of a hard layer) 62b and a polyethylene layer (an example of a soft layer) 62c.

  Even if the pipe 60 to be cut has such a configuration, the pipe cutter 10 of this embodiment has a thickness W1 of the cutting portion 12b of the cutting blade 12 in order to cut the polyethylene layers 62a and 62c, which are soft layers. The thickness is not too large. For this reason, the deformation amount of the cut surface of the polyethylene layers 62a and 62c can be suppressed. Further, in the pipe cutter 10 of the present embodiment, the shape and angle of the cutting edge portion 12c of the cutting blade 12 are set to an optimal configuration and value in order to cut into such a soft layer. For this reason, the front-end | tip of the blade edge | tip part 12c can be cut into the polyethylene layers 62a and 62c.

  Moreover, in the pipe cutter 10 of this embodiment, in order to cut | disconnect the reinforced aluminum layer 62b which is a hard layer, the thickness W1 of the cutting part 12b of the cutting blade 12 is set to the thickness which is not too small. For this reason, the reinforced aluminum layer 62b can be cut without causing the cutting blade 12 to break or spill.

  As described above, in the pipe cutter 10 according to the present embodiment, the soft layer and the hard layer are mixed in the thickness of the cutting portion 12b and the shape and angle of the cutting edge portion 12c in the cutting blade 12 as in the first embodiment. The structure and value are optimal for cutting the three-layer structure pipe 60. For this reason, the pipe 60 having a three-layer structure in which the soft layer and the hard layer are mixed can be cut with a small amount of deformation, and as a result, can be cut well with the circular cut surface being held.

<Embodiment 3>
A third embodiment will be described with reference to FIGS. 12 and 13. In the third embodiment, the configuration of the cutting blade support portion 119 is different from that of the first embodiment. Since other configurations are the same as those of the first embodiment, description of the structure, operation, and effect is omitted. In FIG. 12, the part obtained by adding the numeral 100 to the reference sign in FIG. 4 is the same as the part described in the first embodiment.

  In the pipe cutter 110 according to the third embodiment, as shown in FIG. 12, a part of the inner wall facing the cutting blade 112 of the cutting blade support portion 119 in the main body 120 protrudes toward the cutting blade 112. It has become. Specifically, a portion of the inner wall of the cutting blade support portion 119 that is located on the adjustment shaft 113 side protrudes toward the cutting blade 112 so as to sandwich a part of the cutting blade 112 (hereinafter, the protruding portion is referred to as a restriction portion). 119a). Thereby, the part located in the adjustment shaft 113 side among the cutting parts 112b in the cutting blade 112 is in a state close to the regulating part 119a in the cutting blade support part 119, and the cutting blade 112 is in its thickness direction (Z-axis). (Regarding the direction) is regulated by the regulation unit 119a.

  In this embodiment, the distance W2 (see FIG. 13) of the gap sandwiched by the restricting portion 119a among the gaps formed inside the cutting blade support portion 119 is 1.5 mm. A part of the cutting blade 112, specifically, a part of the cutting edge 112c of the cutting blade 112 and a part of the cutting part 112b having a thickness W3 of 1.2 mm so as to be positioned in the middle of the gap , Is settled. Therefore, the distance W4 between the regulation part 119a in the cutting blade support part 119 and the cutting part 112b in the cutting blade 112 in the gap is 0.15 mm.

  By the way, when the pipe cutter is rotated in the direction around the axis of the pipe while the cutting blade is cut into the soft layer of the pipe, the cutting blade bites into the soft layer and is pulled, and the pipe cutter rotates. The cutting blade may sway in the thickness direction. When the cutting blade is shaken in this way, the cut line formed on the outer peripheral surface of the pipe is shaken, and a straight cut line cannot be put in a shape perpendicular to the extending direction of the pipe, and a good cut surface is obtained. May not be obtained.

  On the other hand, in the pipe cutter 110 of this embodiment, the regulation part 119a in the cutting blade support part 119 of the main body part 120 and the cutting part 112b in the cutting blade 112 are close to each other, and the distance between them is 0.5 mm or less. It is said that. With such a configuration, even when the cutting blade 112 is shaken in the thickness direction, the cutting portion 112b interferes with the restricting portion 119a, and the cutting blade 112 is restricted from being shaken. Accordingly, when the pipe cutter 110 is rotated in the direction around the pipe axis while the cutting blade 112 is cut into the soft layer of the pipe, it is favorable that the cutting blade 112 is shaken in the thickness direction by the restriction portion 119a. Be regulated.

  As described above, in the pipe cutter 110 according to the present embodiment, even when the soft layer of the pipe is cut, the cutting blade 112 is prevented from moving in the thickness direction as the pipe cutter 110 rotates. It is possible to suppress the cutting line, and it is possible to make a cut line straight along the outer peripheral surface of the pipe so as to be orthogonal to the extending direction of the pipe. As a result, a good cut surface can be obtained after the pipe is cut. In particular, this is effective in the pipe cutter 110 that cuts the pipe in such a manner that the cutting blade 112 is cut into the outer peripheral surface of the pipe as in the present embodiment.

<Embodiment 4>
Embodiment 4 will be described with reference to FIGS. 14 and 15. In the fourth embodiment, the configuration of the cutting blade support portion 219 is different from that of the first embodiment. Since other configurations are the same as those of the first embodiment, description of the structure, operation, and effect is omitted. In FIG. 14, the part obtained by adding the numeral 200 to the reference sign in FIG. 4 is the same as the part described in the first embodiment.

  In the pipe cutter 210 according to the fourth embodiment, as shown in FIG. 14, the thickness of the cutting blade support portion 219 in the main body 220 is made thinner than that in the first embodiment, and the inside of the cutting blade support portion 219. The inner member 230 having a substantially cylindrical shape is arranged on the top. The sum of the thickness of the cutting blade support portion 219 and the thickness of the inner member 230 is substantially equal to the thickness of the cutting blade support portion 19 in the first embodiment. As described above, in this embodiment, the portion that supports the cutting blade 212 has a two-layer structure of the cutting blade support portion 219 and the inner member 230. The cutting blade support portion 219 and the inner member 230 are provided with a pair of through screws (an example of a restricting portion) 232 that penetrates the cutting blade support portion 219 and the inner member 230. An inner member 230 is attached. The cutting blade 212 is supported rotatably with respect to the cutting blade support portion 219 and the inner member 230.

  As shown in FIG. 15, the tip of each of the pair of through screws 232 penetrates the inner member 230, and the cutting portion 212 b of the cutting blade 212 that is located on the adjustment shaft 213 side with respect to the support portion 212 a. It is close to a part of the cutting part 212b with a part sandwiched therebetween. Thus, the tip of the penetrating screw 232 restricts the cutting blade 212 from moving in the thickness direction (Z-axis direction). In the present embodiment, the cutting portion 212b having a thickness W5 of 1.2 mm is accommodated between the pair of through screws 232. And distance W6 between the tip of a pair of penetration screws 232 and a part of the above-mentioned cutting part 212b is 0.5 mm, respectively.

  As described above, in the pipe cutter 210 of the present embodiment, the cutting blade support portion 219 and the tip of the penetrating screw 232 that penetrates the inner member 230 and the cutting portion 212b of the cutting blade 112 are close to each other, and the distance therebetween. Is 0.5 mm or less. With such a configuration, even when the cutting blade 212 is shaken in the thickness direction, the cutting portion 212b interferes with the tip of the through screw 232, and the cutting blade 212 is restricted from being shaken. The Accordingly, when the pipe cutter 210 is rotated in the direction around the axis of the pipe while the cutting blade 212 is cut into the soft layer of the pipe, it is preferable that the cutting blade 212 is shaken in the thickness direction by the restriction portion 219a. Be regulated. Thereby, even when the soft layer of the pipe is cut, it is possible to prevent or suppress the cutting blade 212 from moving in the thickness direction as the pipe cutter 210 rotates, and the pipe extending direction. The cut line can be made straight along the outer peripheral surface of the pipe in a shape perpendicular to the pipe. As a result, a good cut surface can be obtained after the pipe is cut.

<Embodiment 5>
The fifth embodiment will be described with reference to FIGS. 16 to 19. In the fifth embodiment, the configuration of the cutting blade 312 is different from that of the first embodiment. Since other configurations are the same as those of the first embodiment, description of the structure, operation, and effect is omitted. 16, 17, and 19, the portions obtained by adding the numeral 300 to the reference numerals in FIGS. 6, 7, and 3 are the same as the portions described in the first embodiment.

  In the pipe cutter 310 (see FIG. 19) according to the fifth embodiment, as shown in FIGS. 16 and 17, both sides of the portion near the boundary with the cutting edge portion 312c of the cutting blade 312b are smoothly recessed. The constricted shape is formed by forming the constricted portion (hereinafter, the constricted portion is referred to as a constricted portion 312d). The thickness of the cutting part 312b is 1.2 mm as in the first embodiment. On the other hand, the constricted portion 312d is provided by recessing 0.2 mm on both sides of the cutting portion 312b. Accordingly, the thickness W7 of the constricted portion 312d is 0.8 mm.

  If the constricted portion 312d is provided in a part of the cutting portion 312b of the cutting blade 312 as in the present embodiment, the constricted portion 312d of the cutting portion 312b escapes from the cut surface of the pipe. Since the stress that the constricted portion 312d receives from the cut surface is reduced, the frictional resistance generated between the cutting blade 312 and the cut surface is reduced. For this reason, if the pipe cutter 310 of this embodiment is used to cut the pipe 350 (see FIG. 18) having a three-layer structure in which a soft layer and a hard layer are mixed, the cutting blade 312 is smoothed against the soft layer of the pipe 350. Can be cut. Then, as shown in FIG. 18, the cut surfaces 352a and 352b of the pipe 350 that has been cut and divided into two are cut straight so as to be perpendicular to the outer peripheral surface 350a of the pipe 350, respectively. It becomes a shape. As described above, in the pipe cutter of this embodiment, the cutting blade 312 can be smoothly cut into the soft layer of the pipe 350, and the cut surfaces 352a and 352b of the pipe 350 cut and divided are substantially uniform surfaces. It can be.

  Moreover, in the pipe cutter 310 of this embodiment, as shown in FIG. 17, the angle θ2 of the tip of the cutting edge 312c in the cutting blade 312 is an angle within a tolerance of 22.6 °. Accordingly, the cutting edge 312c of the cutting blade 312 in the present embodiment has a sharper tip than that of the first embodiment.

  When the angle of the tip of the cutting edge portion 312c in the cutting blade 312 is an angle within a tolerance of 22.6 ° as in the present embodiment, the cutting edge against the softness of the pipe 350 as shown in Table 1 above. The portion 312c can be cut very well, and the durability of the blade edge portion 312c when cutting the hard layer of the pipe 350 is excellent, so that the blade edge portion 312c is effectively spilled. Can be prevented. As described above, in the pipe cutter of the present embodiment, with respect to the angle θ2 of the tip of the blade edge portion 312c, the cutting edge portion 312c can be easily cut into the soft layer of the pipe 350 and the durability of the blade edge portion 312c when cutting the hard layer of the pipe 350. It is possible to realize an optimum angle that combines the characteristics.

  As shown in FIG. 19, in the pipe cutter 310 of this embodiment, a torsion spring 317 is provided between the regulating lever 316 and the movable portion 318 constituting the main body 320 as an alternative to the winding spring 17 in the first embodiment. It is arranged. The torsion spring 317 is wound around the rotating portion of the restriction lever 316 and has one end attached to the restriction lever 316 and the other end attached to the inner wall of the movable portion 318. Accordingly, the regulating lever 316 is engaged with the shaft portion 322 while applying a contact pressure to the shaft portion 322 in a natural state of the torsion spring 317. The operator rotates the regulating lever 316 against the elastic force of the torsion spring 317 to move away from the shaft portion 322, and moves the movable portion 318 relative to the shaft portion 322 along the X-axis direction. The interval between the fixed portion 324 and the movable portion 318 can be adjusted by engaging a part of the regulating lever 316 with the shaft portion 322 by the elastic force of the torsion spring 317.

<Other embodiments>
The present invention is not limited to the embodiments described above and with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each of the above embodiments, a pipe having a three-layer structure of a vinyl chloride skin layer, a foamed vinyl chloride layer, and a hard vinyl chloride layer, a polyethylene layer, a reinforced aluminum layer, and a polyethylene layer Although an example of cutting a pipe having a three-layer structure is shown, the pipe to be cut is not limited to this. If the pipe has a three-layer structure in which a soft layer and a hard layer are mixed, the pipe cutter according to the embodiment can be used to cut well while holding a circular cut surface.

(2) In each of the above embodiments, an example in which the hard layer of the pipe is a hard vinyl chloride layer or a reinforced aluminum layer has been shown. However, the hard layer is composed of a layer formed of resin and a layer formed of metal. Any may be sufficient and it is not limited.

(3) In each of the above-described embodiments, the configuration in which the main body portion includes the fixed portion, the shaft portion, and the movable portion has been exemplified. However, the configuration of the main body portion can be appropriately changed.

(4) In each of the above embodiments, the configuration in which the position of the cutting blade can be finely adjusted with the adjusting screw is exemplified, but the configuration for finely adjusting the position of the cutting blade is not limited.

(5) In addition to the above third and fourth embodiments, the configuration, arrangement, and the like of the restricting portion provided in the main body can be changed as appropriate.

(6) In addition to the fifth embodiment, the thickness, shape, and the like of the constricted portion provided in the cutting portion can be appropriately changed.

  As mentioned above, although embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

  10, 110, 210 ... pipe cutter, 12, 112, 212, 312 ... cutting blade, 12a, 112a, 212a, 312a ... support part, 12b, 112b, 212b, 312b ... cutting part, 12c, 112c, 212c, 312c ... cutting edge, 14, 114, 214 ... adjusting screw, 16 ... regulating lever, 17 ... winding spring, 18, 118, 218 ... movable part, 19 119, 219 ... cutting blade support part, 20, 120, 220 ... main body part, 22, 122, 222 ... shaft part, 24, 124, 224 ... fixed part, 24a, 124a, 224a ... notch, 24b ... recess, 50, 60 ... pipe, 119a ... regulator, 232 ... through screw, 312d ... constriction, 317 ... torsion spring, CS ... cutting space

Claims (3)

A pipe cutter for cutting a pipe having a three-layer structure in which a soft layer and a hard layer are mixed,
The main body,
A roller provided on the main body, and abutted against an outer peripheral surface of the pipe when cutting the pipe;
A disc-shaped cutting blade that comes into contact with the outer peripheral surface of the pipe and cuts the pipe, and a support portion that is rotatably supported with respect to the main body portion, and has a constant thickness outward from the support portion. A cutting blade that has a cutting portion that extends, and a cutting edge that forms the cutting edge of the cutting blade and has a cross-sectional shape that is an isosceles triangle,
The cutting blade has a thickness of the cutting portion in the range of 1.0 mm to 1.2 mm,
Provided on the main body portion, and restricts at least a part of the cutting portion of the cutting blade from moving in the thickness direction, and includes a restriction portion having a distance of 0.5 mm or less from the cutting portion. A pipe cutter characterized by that.   The main body includes a fixed portion provided with the roller, a shaft portion fixed to the fixed portion and extending in an axial shape, and is movable relative to the shaft portion in the axial direction thereof. The pipe cutter according to claim 1, further comprising a movable part provided.   3. The pipe cutter according to claim 1, wherein the cutting blade has a constricted shape because a part of the cutting portion is recessed. 4.

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