JP2016043444A - Pipe cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe cutter which rarely generates burrs when cutting a pipe.SOLUTION: The pipe cutter is equipped with a pipe receiving member which receives a pipe so as to rotate about a center axis; a blade holding member which holds a roller blade so as to rotate about an axis extending in the same direction as the center axis of the pipe received by the pipe receiving member; and an actuation mechanism which contacts/separates one of the pipe receiving member or the blade holding member to/from the other by the operation of an operating portion. The actuation mechanism has an energizing member which can be elastically deformed, increases the deformation amount of the elastic deformation with the operation of the operating portion for bringing the pipe receiving member and the blade holding member close to each other while the roller blade abuts on the pipe, and energizes one member toward the other member by resilient force due to the elastic deformation. The energizing member is elastically deformed when the roller blade does not abut on the pipe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe cutter for cutting a pipe such as a copper pipe.

  Conventionally, a pipe cutter that cuts a pipe formed of metal or resin is known. This type of pipe cutter cuts a pipe by bringing a disc-shaped roller blade into pressure contact with the outer peripheral surface of the pipe and rotating the roller blade along the outer peripheral surface of the pipe.

  The pipe cutter includes, for example, a pipe receiving member that receives a pipe rotatably around a central axis of the pipe, a disk-shaped roller blade, and a central axis of a pipe that the pipe receiving member receives the roller blade. A blade holding member that holds the blade holding member rotatably about an axis extending in the same direction; and an operating mechanism that moves the blade holding member toward and away from the pipe receiving member (see, for example, Patent Document 1).

  According to the pipe cutter, the blade holding portion is moved closer to the pipe receiving member by the operating mechanism in a state where the pipe receiving member receives the pipe to be cut. Then, the entire pipe cutter is rotated along the peripheral surface of the pipe (rotated around the central axis of the pipe) with the outer peripheral edge of the roller blade pressed against the outer peripheral surface of the pipe with a predetermined pressure. The pipe can be cut.

JP 2007-98545 A

  However, in the above-described pipe cutter, a large burr may be generated at the cut portion of the cut pipe due to the pressure when the roller blade is pressed against the outer peripheral surface of the pipe by the operating mechanism. In particular, when the force with which the roller blade is pressed against the pipe is almost zero immediately before the pipe is cut, the occurrence of the burr becomes remarkable.

  Then, this invention makes it a subject to provide the pipe cutter which does not produce a burr | flash easily at the time of the cutting | disconnection of a pipe.

  A pipe cutter according to the present invention includes a pipe receiving member that receives a pipe rotatably around a central axis of the pipe, and a disk-shaped roller blade that extends in the same direction as the central axis of the pipe that the pipe receiving member receives. A blade holding member that can be rotatably held around an axis, and an operation portion, and by operating the operation portion, either the pipe receiving member or the blade holding member is attached to the other member. An actuating mechanism that contacts and separates, and the actuating mechanism is an elastically deformable biasing member that approaches the pipe receiving member and the blade holding member in a state where the roller blade is in contact with the pipe. As the operating unit is operated, the amount of elastic deformation increases, and a biasing member that biases the one member toward the other member by the elastic force of the elastic deformation is provided. And the energizing Wood, when the roller blade is not in contact with the pipe is elastically deformed.

  According to this configuration, when the roller blade is pressed against the pipe by the elastic force of the urging member and the pipe is cut, even if the elastic force becomes the smallest, the predetermined elastic force (the roller blade is One of the pipe receiving member and the blade holding member is urged against the other member by the elastic force due to the elastic deformation of the urging member when not in contact with the pipe. Is pressed against the pipe with a predetermined force, so that generation of burrs at the cut portion can be effectively prevented.

  In the pipe cutter, the operating mechanism may bring the blade holding member into contact with or separated from the pipe receiving member.

  According to this configuration, when the roller blade is brought into contact with the pipe received by the pipe receiving member, the blade holding member approaches the pipe receiving member (that is, the structure that moves the pipe receiving member receiving the pipe). Therefore, the displacement of the pipe from the pipe receiving member when the operation unit is operated is suppressed.

  In this case, in the pipe cutter, for example, the operating mechanism includes a slide shaft portion provided with a screw hole extending from the blade holding member and extending from the tip toward the blade holding member, and the center of the slide shaft portion. An operation unit rotatable around an axis, the operation unit having a screw part screwed into the screw hole, and the slide shaft part in the direction of the central axis while preventing rotation around the central axis. You may have a holding | maintenance part which hold | maintains so that a movement may be permitted, and may hold | maintain the said operation part so that rotation around the said central axis may be permitted.

  According to such a configuration, the slide shaft portion can be reciprocated (slid) in the central axis direction by a simple operation such as rotating the operation portion, whereby the blade holding member can be moved toward and away from the pipe receiving member. .

  Further, in the pipe cutter, the operation portion includes a rotating shaft portion that extends in the central axis direction, has the screw portion at a tip, and is rotatable around the central axis, and the biasing member is The spring coil may be arranged in a state where the rotating shaft portion is inserted along the spiral center.

  According to such a configuration, since the biasing member is disposed so as to surround the periphery of the rotation shaft portion (in a state where the rotation shaft portion is inserted along the spiral center), only the biasing member is disposed. Compared to the case where the space is provided and the urging member is disposed in the space, the length of the urging member in the spiral center direction can be ensured while saving the space for disposing the urging member.

In the pipe cutter, the operating mechanism includes a pressing member that surrounds the rotation shaft portion in a circumferential direction of the rotation shaft portion and is rotatable around the central axis together with the rotation shaft portion. The dynamic shaft portion has a flange portion that extends in a direction perpendicular to the central axis at a position closer to the blade holding member than the pressing member in the central axis direction, and the spring coil includes the pressing member, the flange portion, and the like. Placed between the
It is preferable.

  According to this configuration, since the pressing member and the flange portion that are in contact with both ends of the spring coil are rotated along with the rotation of the rotating shaft portion, the biasing member is also rotated together with the rotating shaft portion. Even when the urging member disposed between the member and the flange portion is always elastically deformed, the rotation operation of the operation portion is not hindered by the elastic force of the urging member.

  In the pipe cutter, the operation mechanism may include a fixing portion that can fix the operation portion.

  According to this configuration, since the operation unit can be fixed, even when the entire pipe cutter is rotated in the circumferential direction of the pipe with the roller blade pressed against the pipe, It is possible to reliably prevent an erroneous operation (the force that causes the roller blade to be pressed against the pipe by rotating the operation unit more than necessary) becomes too large or too small.

  As described above, according to the present invention, it is possible to provide a pipe cutter that is less likely to generate burrs when cutting a pipe.

FIG. 1 is a perspective view of the pipe cutter of the present embodiment. FIG. 2 is a longitudinal sectional view of the pipe cutter. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 in the pipe cutter. 4 is a cross-sectional view of the pipe cutter taken along line IV-IV in FIG. FIG. 5 is a cross-sectional view of the pipe cutter taken along the line VV in FIG. FIG. 6 is a perspective view of the pipe cutter with a grip removed. FIG. 7 is a perspective view of the grip. FIG. 8 is a longitudinal sectional view of the grip. FIG. 9 is a diagram for explaining a usage state of the pipe cutter.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  The pipe cutter which concerns on this embodiment is used in order to cut | disconnect a pipe made from soft metals, such as copper and aluminum, for example. As shown in FIGS. 1 and 2, the pipe cutter includes a pipe receiving member 2 that receives (supports) a pipe P, a disk-shaped roller blade 3, and a blade holding portion (blade holding member) that holds the roller blade 3. ) 4 and an operation mechanism section (operation mechanism) 5 that relatively moves the pipe receiving member 2 and the blade holding section 4. Further, the pipe cutter 1 includes a frame 6 that connects the pipe receiving member 2 and the operation mechanism unit 5.

  The frame 6 includes a first support portion 61, a second support portion 62 that faces the first support portion 61 with a space therebetween, one end of the first support portion 61 (left end in FIG. 2), and the second support portion 62. And a connecting portion 63 that connects one end (the left end in FIG. 2). The frame 6 has a pipe P in a region surrounded by the frame 6 from between the other end of the first support portion 61 (right end in FIG. 2) and the other end of the second support portion 62 (right end in FIG. 2). Can be placed (inserted). In the frame 6 of the present embodiment, the pipe receiving member 2 is disposed on the first support portion 61, and the operation mechanism portion 5 is disposed on the second support portion 62.

  The pipe receiving member 2 receives (supports) the pipe P so as to be rotatable around the central axis Cp of the pipe. The pipe receiving member 2 of the present embodiment is a plurality (two in the example of the present embodiment) of rotating rollers 21 provided at the other end of the first support portion 61 of the frame 6. Each rotating roller 21 includes a rotating shaft 22 and a roller body 23 having a cylindrical outer peripheral surface. The roller body 23 is rotatable around the rotation shaft 22. The plurality of rotating rollers 21 are arranged such that the rotating shafts 22 are parallel to each other. The pipe receiving member 2 receives the pipe so that the outer peripheral surface of the pipe P is in contact with the outer peripheral surface of each roller body 23 in a state where the rotation shaft 22 of each rotary roller 21 and the central axis Cp of the pipe P are parallel to each other. (See FIG. 2).

  The roller blade 3 is a disk-shaped blade and is attached to the blade holding portion 4.

  The blade holding portion 4 has a rotation shaft (axis line) 41 extending in the same direction as the central axis Cp of the pipe P received by the pipe receiving member 2, and holds the roller blade 3 rotatably around the rotation shaft 41. . The blade holding part 4 of this embodiment hold | maintains a roller blade so that attachment or detachment is possible.

  The actuating mechanism unit 5 brings one member (or part) of the pipe receiving member 2 or the blade holding part 4 into contact with or separated from the other member (or part). Thereby, the space | interval of the pipe receiving member 2 and the roller blade 3 hold | maintained at the blade holding | maintenance part 4 can be changed. The operation mechanism unit 5 is directly or indirectly attached to the operation unit 52 that operates the contact and separation between the pipe receiving member 2 and the blade holding unit 4, and the blade holding unit 4 toward the pipe supported by the pipe receiving member 2. And a biasing member 54 for biasing. Specifically, the operation mechanism unit 5 elastically moves the slide shaft portion 51 extending from the blade holding portion 4, the operation portion 52 that moves (slides) the slide shaft portion 51 toward the pipe receiving member 2, and the biasing member 54. A spring pressing member (pressing member) 53 that presses in a deformed state, a biasing member 54 that biases the blade holding portion 4 via the slide shaft portion 51, and a holding portion that is connected to the frame 6 and holds the operation portion 52. 55.

  The slide shaft part 51 is a part extending from the blade holding part 4. The slide shaft portion 51 is provided with a screw hole 511 extending from the tip (upper end in FIG. 2) toward the blade holding portion 4. The cross-sectional shape (specifically, the peripheral shape of the cross section) perpendicular to the central axis C in the slide shaft portion 51 is non-circular (in the example of the present embodiment, a square) as shown in FIG. With this cross-sectional shape, when the slide shaft portion 51 reciprocates (slides) in the direction of the central axis C with respect to the holding portion 55, the rotation of the slide shaft portion 51 around the central axis C is restricted. In addition, in the pipe cutter 1 of this embodiment, although the blade holding | maintenance part 4 and the slide shaft part 51 are integral, it is not limited to this structure. The blade holding part 4 and the slide shaft part 51 may be separate.

  The operation part 52 can be rotated around the central axis C of the slide shaft part 51. The operation part 52 of this embodiment makes the blade holding | maintenance part 4 contact / separate with respect to the pipe receiving member 2 by rotating. The operation unit 52 includes a rotatable rotation shaft portion 56 and a grip 57 that rotates the rotation shaft portion 56. The operation unit 52 also includes a transmission member 58 that transmits the rotation operation of the grip 57 to the rotation shaft unit 56.

  The rotation shaft portion 56 extends in the direction of the central axis C of the slide shaft portion 51 and can rotate about the central axis C, and one end of the rotation shaft main body 560 (lower end in FIG. 2). And a screw portion 561 that is screwed into the screw hole 511 of the slide shaft portion 51. The rotation shaft portion 56 rotates around the central axis C by screwing the screw portion 561 of the rotation shaft portion 56 and the screw hole 511 of the slide shaft portion 51, so that the rotation shaft portion 56 is rotated. The slide shaft portion 51 reciprocates (slides) in the direction of the central axis C. In the pipe cutter 1 of this embodiment, the slide shaft portion 51 approaches the pipe receiving member 2 when the rotation shaft portion 56 rotates clockwise as viewed from the blade holding portion 4 toward the pipe receiving member 2. When the rotation shaft portion 56 rotates counterclockwise, the slide shaft portion 51 moves away from the pipe receiving member 2. In the pipe cutter 1 of the present embodiment, for example, when the rotation shaft portion 56 makes one rotation, the slide shaft portion 51 moves 1 mm in the direction of the central axis C.

  As shown in FIG. 4, the rotation shaft main body 560 is a cylindrical portion, and includes a flange portion (flange) 562 that expands in the radial direction at a midway position in the central axis C direction. In the rotation shaft main body 560 of the present embodiment, the diameter of the first portion 563 on one end side (the lower side in FIG. 2) of the rotation shaft portion 56 with respect to the flange portion 562 is the rotation shaft with respect to the flange portion 562. It is smaller than the diameter of the second portion 564 on the other end side (the upper side in FIG. 2) of the portion 56. A spring pressing member 53 is provided at the distal end of the first portion 563 of the pivot shaft main body 560 (the other end of the pivot shaft 56: the upper end in FIG. 2) so as to surround the outer peripheral surface of the outer tip in the circumferential direction. Has been placed. The urging member 54 is disposed between the spring pressing member 53 and the flange portion 562. The distance between the spring pressing member 53 and the flange portion 562 is smaller than the natural length (the length in a state where the spring pressing member 53 is not elastically deformed) of the biasing member (coil spring in the example of the present embodiment).

  The spring pressing member 53 surrounds the rotation shaft portion 56 in the circumferential direction. The spring pressing member 53 can rotate around the central axis C together with the rotating shaft portion 56. Further, the spring pressing member 53 can move (slid in the example of this embodiment) in the direction of the central axis C with respect to the rotation shaft portion 56. The spring pressing member 53 sandwiches the urging member 54 between the flange portion 562 of the rotating shaft main body 560 as described above. Specifically, the spring pressing member 53 is cylindrical. Specifically, the spring pressing member 53 includes a short cylindrical small-diameter portion 531 and a large-diameter portion 532 that expands in the radial direction from one end of the small-diameter portion 531. The outer diameter of the small diameter portion 531 is the same as or slightly smaller than the inner diameter of the through hole 555 provided in the holding portion 55, and the outer diameter of the large diameter portion 532 is larger than the inner diameter of the through hole 555. The spring pressing member 53 is disposed in a state where the small diameter portion 531 is inserted into the through hole 555 of the holding portion 55 and the large diameter portion 532 is in contact with the biasing member 54.

  The transmission member 58 is a plate-like member that extends in a direction orthogonal to the central axis C, and is fixed to the other end of the rotation shaft portion 56. The transmission member 58 of the present embodiment is fixed to the rotation shaft portion 56 with a screw. As shown in FIGS. 1, 5, and 6, a plurality of convex portions 581 are arranged on the outer peripheral edge of the transmission member 58 at intervals in the circumferential direction. That is, the transmission member 58 has a gear-like contour shape.

  The grip 57 is a member that can be rotated around the central axis C and is attached to the holding portion 55 so as to be able to reciprocate (slide) in the direction of the central axis C. As shown in FIGS. 1, 2, 7, and 8, the grip 57 of the present embodiment is a cylindrical member, and the inner diameter thereof is larger than the outer diameter of the rotating shaft portion 56. The inner peripheral surface 571 of the grip 57 is provided with a ridge 572 extending in the circumferential direction over the entire circumference of the inner peripheral surface 571 at an intermediate position in the central axis C direction. The inner diameter of the grip 57 at the top position of the ridge 572 in the central axis C direction is slightly smaller than the outer diameter of the resin O-ring 8 (see FIGS. 2 and 6) provided on the outer peripheral surface of the holding portion 55. . On the other hand, the inner diameter of the inner peripheral surface 571 at a position excluding the ridges 572 in the central axis C direction is larger than the outer diameter of the O-ring 8. In addition, a plurality of grooves 573 are provided in a portion of the inner peripheral surface 571 of the grip 57 that is on the other end side (upper side in FIG. 2) from the ridge 572.

  Each of the plurality of grooves 573 extends in the direction of the central axis C and is arranged at intervals in the circumferential direction. The plurality of grooves 573 are slidably engaged with the outer peripheral edge of the transmission member 58. Specifically, each of the plurality of protrusions 581 provided on the outer peripheral edge of the transmission member 58 enters each of the plurality of grooves 573. Specifically, the circumferential width of each groove 573 and the interval between the circumferentially adjacent grooves 573 are adjacent to the circumferential width of the convex portion 581 provided on the outer peripheral edge of the transmission member 58 and the circumferential direction. This corresponds to the interval between the convex portions 581. The width of each groove 573 is the same at each position in the central axis C direction. The protrusions 581 on the outer peripheral edge of the transmission member 58 enter the grooves (respective grooves on the inner peripheral surface 571 of the grip 57) 573, so that the relative rotation around the central axis C between the grip 57 and the transmission member 58 is performed. Be regulated. That is, the transmission member 58 rotates about the central axis C together with the grip 57 as the grip 57 is rotated. Thereby, the rotation operation of the grip 57 is transmitted to the rotation shaft portion 56 via the transmission member 58. The grip 57 is guided by the grooves 573 when moving in the direction of the central axis C.

  A first engaging portion 574 is provided at one end (the lower end in FIG. 2) of the inner peripheral surface 571 of the grip 57. The first engagement portion 574 can be engaged with a second engagement portion 59 provided on the holding portion 55.

  The first engaging portion 574 has a shape in which unevenness in the central axis C direction is repeated in the circumferential direction. The first engagement portion 574 of the present embodiment has a step between an end region 571A on one end side of the inner peripheral surface 571 and an adjacent region 571B adjacent to the end region 571A and having a smaller inner diameter than the end region 571A. It is constituted by. Specifically, the first engagement portion 574 has a plurality of convex portions 575 that project toward one end side. The plurality of convex portions 575 are arranged at intervals in the circumferential direction. In the convex portion 575 of this embodiment, a surface (inclined surface) 575A facing in the counterclockwise direction is inclined with respect to the central axis C when viewed in the direction from the blade holding portion 4 toward the pipe receiving member 2. The surface (parallel surface) 575B facing in the clockwise direction is parallel to the central axis C. The inclined surface 575A is inclined so that the base portion of the convex portion 575 is positioned in a counterclockwise direction from the tip portion.

  The urging member 54 can be elastically deformed. The urging member 54 is used to operate the operation unit 52 so that the pipe receiving member 2 and the blade holding unit 4 are brought close to each other with the roller blade 3 in contact with the pipe P supported by the pipe receiving member 2. Accordingly, the deformation amount of the elastic deformation increases, and the blade holding portion 4 is urged toward the pipe receiving member 2 by the elastic force generated by the elastic deformation. As described above, the urging member 54 of the present embodiment is a spring coil and urges the roller blade 3 via the rotation shaft portion 56, the slide shaft portion 51, and the blade holding portion 4.

  Specifically, the urging member 54 is disposed between the flange portion 562 and the spring pressing member 53 in a state where the urging member 54 is inserted through the rotation shaft portion 56 (specifically, the second portion 564) along the spiral center. . In this state, since the distance between the spring pressing member 53 and the flange portion 562 is smaller than the natural length of the urging member 54 as described above, the urging member 54 is elastically deformed in the spiral center direction (center axis C direction). Arranged in a state. In addition, when the rotation shaft portion 56 moves to the other end side, the spring pressing member 53 has the large diameter portion 532 that cannot pass through the through hole 555 of the holding portion 55. Movement to one end side is restricted. Thereby, the space | interval of the spring pressing member 53 and the flange part 562 becomes small, and the deformation amount of the elastic deformation of the urging | biasing member 54 increases with the reduction | decrease of this space | interval.

  The holding portion 55 holds the slide shaft portion 51 so as to allow movement (reciprocating movement) in the direction of the central axis C while preventing the rotation about the central axis C, and the operation portion 52 around the central axis C. Is held so as to allow the rotation. The holding unit 55 of the present embodiment also allows the operation unit 52 to move (reciprocate) in the direction of the central axis C. The holding portion 55 is formed with a hollow portion 551 that penetrates in the direction of the central axis C. The slide shaft portion 51 and the rotation shaft portion 56 are arranged so as to pass through the hollow portion 551 of the holding portion 55, and the grip 57 is arranged outside the holding portion 55 so as to surround the holding portion 55 in the circumferential direction. Is done.

  The holding part 55 has an inner peripheral surface 552 that defines the hollow part 551. The inner peripheral surface 552 has a shape corresponding to the noncircular cross-sectional shape of the slide shaft portion 51. Specifically, the inner peripheral surface 552 has a shape that allows reciprocation (sliding) of the slide shaft portion 51 in the direction of the central axis C and restricts (blocks) rotation of the slide shaft portion 51 around the central axis C. Have. As shown in FIGS. 3 and 4, the inner peripheral surface 552 of the present embodiment has four grooves 553 corresponding to four corners (four corners) in the cross section (positive direction cross section) of the slide shaft portion 51. Each groove 553 extends in the direction of the central axis C and has a cross-sectional shape (V-shaped cross-sectional shape) along the four corners of the slide shaft portion 51.

  Moreover, the operation mechanism part 5 has the 2nd engaging part 59 arrange | positioned around the holding | maintenance part 55 as mentioned above. As shown in FIG. 6, the second engagement portion 59 has a shape in which irregularities in the central axis C direction are repeated in the circumferential direction. The unevenness is a shape corresponding to (engaged with) the unevenness of the first engagement portion 574 of the grip 57. Specifically, the second engagement portion 59 of the present embodiment includes an end region 591 on the other end side (upper side in FIG. 6) on the outer peripheral surface, and adjacent to the end region 591 and from the end region 591. It is constituted by a step with an adjacent region 592 having a large outer diameter. Specifically, the second engagement portion 59 has a plurality of convex portions 593 that protrude toward the other end side. The plurality of convex portions 593 are arranged at intervals in the circumferential direction. The circumferential width of each convex portion 593 corresponds to the interval between the convex portions 575 adjacent in the circumferential direction of the first engagement portion 574, and the interval between the respective convex portions 593 adjacent in the circumferential direction is the first engagement. This corresponds to the circumferential width of the convex portion 575 of the joint portion 574. In the convex portion 593 of the present embodiment, when viewed in the direction from the blade holding portion 4 toward the pipe receiving member 2, a surface (inclined surface) 593A facing in the clockwise direction is inclined with respect to the central axis C, A surface (parallel surface) 593B facing in the counterclockwise direction is parallel to the central axis C. The inclined surface 593A is inclined so that the base portion of the convex portion 593 is positioned in a clockwise direction from the tip portion. The angle of the inclined surface 593A with respect to the central axis C is the same as the angle of the convex portion 575 of the first engaging portion 574 with respect to the central axis C of the inclined surface 575A.

  The second engagement portion 59 can restrict the rotation of the operation portion 52 around the central axis C together with the first engagement portion 574 of the grip 57 (that is, the operation portion 52 can be fixed). The fixing part 7 is configured. The details of the opening and fixing (engaging) operations of the fixing portion 7 are as follows.

  A state in which the first engaging portion 574 and the second engaging portion 59 are engaged with each other (that is, each convex portion 575 of the first engaging portion 574 is fitted between the convex portions 593 of the second engaging portion 59, and In a state in which each convex portion 593 of the second engaging portion 59 is fitted between the convex portions 575 of the first engaging portion 574, the grip 57 is viewed from the blade holding portion 4 toward the pipe receiving member 2. Even if it is intended to rotate clockwise, the parallel surface 575B of the convex portion 575 of the first engaging portion 574 and the parallel surface 593B of the convex portion 593 of the second engaging portion 59 are in contact with each other. It cannot be rotated. That is, in this state, the operation unit 52 is fixed. At this time, the protrusion 572 of the inner peripheral surface 571 is located on one end side (lower side in FIG. 2) from the O-ring 8. Hereinafter, the position of the grip 57 in this state is referred to as an engagement position.

  On the other hand, when the grip 57 is rotated counterclockwise when the grip 57 is in the engaged position, the inclined surface 575A of the convex portion 575 of the first engaging portion 574 and the convex portion 593 of the second engaging portion 59 are obtained. Although the inclined surface 593A is in contact with each other, it is inclined in the same direction and at the same angle with respect to the central axis C, so that the grip 57 and the second engaging portion 59 are separated from each other in the central axis C direction. Power is added. Thereby, the grip 57 moves to the other end side (upper side in FIG. 2) with respect to the second engaging portion 59. Thereby, the protrusion 572 of the inner peripheral surface 571 moves to the space between the O-ring 8 and the transmission member 58 (hereinafter, the position of the grip 57 in this state is referred to as an open position). When the grip 57 is in the open position, the first engaging portion 574 and the second engaging portion 59 are separated in the central axis C direction (the meshed state is released), and the grip 57 is rotated clockwise and counterclockwise. The movement becomes free.

  When the grip 57 is moved from the engagement position to the release position, the grip 57 is moved in the direction of the central axis C until the protrusion 572 of the inner peripheral surface 571 moves between the O-ring 8 and the transmission member 58. You may pull and move straight (without rotating around the central axis C) to the other end side. Further, since the inner diameter of the inner peripheral surface 571 at the position of the top of the ridge 572 is smaller than the outer diameter of the O-ring 8, the grip 57 can be The ridges 572 of 571 do not move (slide) to a position on one end side from the O-ring 8. For this reason, when the grip 57 is in the open position, the grip 57 is maintained in the open position until the predetermined force is applied. Similarly, when the grip 57 is in the engaged position, the grip 57 is maintained in the engaged position until the predetermined force is applied.

  Further, by pushing (moving) the grip 57 toward one end side (the lower side in FIG. 2) in the central axis C direction, the first engagement portion 574 and the second engagement portion 59 are engaged with each other. The grip 57 is fixed. That is, the grip 57 becomes the engagement position.

  In the pipe cutter 1 configured as described above, the pipe P is cut as follows.

  First, the pipe P is disposed on the pipe receiving member 2. With the pipe receiving member 2 receiving the pipe P, the grip 57 is rotated clockwise as viewed from the blade holding portion 4 toward the pipe receiving member 2. At this time, since the rotation of the slide shaft portion 51 is restricted by the inner peripheral surface 552 of the holding portion 55, the rotation shaft portion 56 (screw portion 561) rotates, so that the slide shaft portion 51 becomes the pipe receiving member 2. Move to the side. As a result, the roller blade 3 approaches the pipe P. At this time, if the grip 57 is in the engaged position, the grip 57 is moved (slid) to the open position, and then the grip 57 is rotated clockwise to bring the roller blade 3 closer to the pipe.

  When the roller blade 3 contacts the pipe P, the grip 57 is further rotated clockwise by a predetermined amount from that point. For example, in this embodiment, after the roller blade 3 contacts the pipe P, the grip 57 is rotated once. At this time, since the roller blade 3 is in contact with the pipe P and cannot move to the pipe receiving member 2 side, the rotating shaft portion 56 and the transmission member 58 are connected to the slide shaft portion 51 as shown in FIG. To the side (upper side in FIG. 9). Thereby, the space | interval of the flange part 562 and the spring pressing member 53 becomes narrow, and the deformation amount of the elastic deformation of the biasing member 54 increases. In this state, the roller blade 3 is urged toward the pipe P (pipe receiving member 2) by the urging member 54 via the rotation shaft portion 56, the slide shaft portion 51, and the blade holding portion 4. That is, the pipe P is sandwiched between the roller blade 3 held by the blade holding portion 4 and the pipe receiving member 2 with a predetermined force (the urging force).

  In this state, after the grip 57 is moved to the engagement position and fixed, the entire pipe cutter 1 is rotated in the circumferential direction of the pipe P (around the central axis Cp of the pipe P). As a result, the outer edge (blade edge) of the roller blade 3 is pressed against the pipe P with a predetermined force (the aforementioned urging force) while rotating (revolving) in the circumferential direction along the outer peripheral surface of the pipe. With the revolution, the roller blade 3 itself rotates (spins), and the pipe P is cut.

  Thus, even when the elastic force becomes the smallest when the roller blade 3 is pressed against the pipe P by the elastic force of the urging member 54 to cut the pipe P, the pipe cutter 1 of the present embodiment The blade holding portion 4 is urged against the pipe receiving member 2 by a predetermined elastic force (elastic force due to elastic deformation of the urging member 54 in a state where the roller blade 3 is not in contact with the pipe P). . Thereby, since the roller blade 3 is pressed against the pipe P with a force equal to or greater than a predetermined elastic force, it is possible to effectively prevent the occurrence of burrs at the cut portion. Details are as follows.

  A pipe cutter in which the roller blade is biased by the biasing member, and the biasing member is not elastically deformed when the roller blade is not in contact with the pipe (the roller blade is biased toward the pipe receiving member). In the case of a pipe cutter, even when the urging member is elastically deformed to generate an elastic force when the pipe is cut, if the urging member is elastically restored and the elastic deformation amount becomes zero (the elastic force is reduced) When it becomes the smallest), the urging force to the roller blade becomes zero. For this reason, in the pipe cutter, even if the urging member is elastically deformed when cutting the pipe and the urging force toward the pipe is urged toward the roller blade, the urging force of the urging member is just before the pipe is cut. In some cases, the force is substantially 0 (the amount of elastic deformation is approximately 0), and the urging force applied to the roller blades is approximately 0. In this case, a big burr | flash tends to arise in the cutting location of a pipe.

  On the other hand, in the pipe cutter 1 of this embodiment, since the urging member 54 is elastically deformed even when the roller blade 3 is not in contact with the pipe P, the elastic force becomes the smallest when the pipe P is cut. However, the roller blade 3 is urged against the pipe P by a predetermined elastic force (elastic force due to elastic deformation of the urging member 54 in a state where the roller blade 3 is not in contact with the pipe P). . For this reason, even if the urging force applied to the roller blade 3 does not become zero, and the resilience force is minimized just before the pipe P is cut, the roller blade 3 has a predetermined force against the pipe P ( It is pressed with the predetermined elasticity. As a result, it is possible to prevent a large burr from occurring at the cut portion of the pipe P.

  Further, in the pipe cutter 1 of the present embodiment, when the roller blade 3 is brought into contact with the pipe P received by the pipe receiving member 2, the blade holding portion 4 approaches the pipe receiving member 2 (that is, the pipe Therefore, the displacement of the pipe P from the pipe receiving member 2 when the operation unit 52 is operated can be suppressed.

  In the pipe cutter 1 of the present embodiment, the slide shaft portion 51 is reciprocated (slid) in the direction of the central axis C by a simple operation such as rotating the operation portion 52, whereby the blade holding portion 4 is moved to the pipe receiving member. 2 can be contacted and separated from each other.

  Further, in the pipe cutter 1 of the present embodiment, the urging member 54 is disposed so as to surround the rotation shaft portion 56 (in a state where the rotation shaft portion 56 is inserted along the spiral center). For this reason, the spiral of the urging member 54 is achieved while saving the space for arranging the urging member 54 as compared with a configuration in which only the urging member 54 is disposed and the urging member 54 is disposed in the space. It is easy to ensure the length in the center direction.

  Further, in the pipe cutter 1 of the present embodiment, the spring pressing member 53 and the flange portion 562 with which both ends of the urging member (spring coil) 54 abut can rotate as the rotation shaft portion 56 rotates. When the rotation shaft portion 56 is rotated, the urging member 54 also rotates together with the rotation shaft portion 56. Thereby, even if the urging member 54 disposed between the spring pressing member 53 and the flange portion 562 is always elastically deformed, the rotation operation of the operation portion 52 is hindered by the elastic force of the urging member 54. Not. That is, when the spring pressing member 53 does not rotate together with the rotating member 56, the biasing member 54 and the spring pressing member 53 or the flange portion are in a state where the elastic force from the biasing member 54 is applied to the spring pressing member 53. Since the relative rotation with respect to 562 requires a large force to rotate the rotation shaft portion 56, the pipe cutter 1 according to the present embodiment does not cause the relative rotation, thereby enabling the operation. It is possible to prevent the rotation operation of the portion 52 from being hindered by the elastic force of the biasing member 54.

  Moreover, in the pipe cutter 1 of this embodiment, the operation part 52 (grip 57) can be fixed. For this reason, when the roller cutter 3 is pressed against the pipe P and the entire pipe cutter 1 is rotated in the circumferential direction of the pipe P, even if the operation section 52 is held and rotated, the operation section 52 may be erroneously operated (operation It is possible to reliably prevent the force by which the portion 52 is rotated more than necessary and the roller blade 3 is pressed against the pipe from becoming too large or too small.

  In addition, the pipe cutter of this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  Although the pipe cutter 1 of the said embodiment is equipped with the roller blade 3 as a structural requirement, it is not limited to this structure. The pipe cutter 1 may not include the roller blade 3 as a constituent requirement. In this case, the pipe cutter 1 is used after the separately purchased roller blade 3 is attached to the blade holding portion 4.

  The urging member 54 of the pipe cutter 1 of the above embodiment is a spring coil, but is not limited to this configuration. The biasing member 54 may be another spring member such as a leaf spring, for example. That is, the urging member 54 may be any member that can be elastically deformed and can urge the blade holding portion by the elastic force generated by the elastic deformation.

  In the pipe cutter 1 of the above-described embodiment, the urging member 54 is disposed in a state where the rotation shaft portion 56 is inserted along the spiral center, but the configuration is not limited thereto. The pipe cutter 1 may be provided with a space for disposing the urging member 54, and only the urging member 54 may be disposed in the space. That is, even when the roller blade 3 is not in contact with the pipe P, the urging member 54 is arranged so as to be elastically deformed, and after the roller blade 3 contacts the pipe P, the blade holding portion (blade holding member) 4 and If the operation part 52 is operated in a direction in which the pipe receiving member 2 is brought close to the pipe receiving member 2, the arrangement location is not limited as long as it is arranged so that the amount of elastic deformation is larger.

  In the pipe cutter 1 of the said embodiment, although the blade holding part (blade holding member) 4 is contacting / separating with respect to the pipe receiving member 2, it is not limited to this structure. The pipe cutter 1 may be configured such that the pipe receiving member 2 is in contact with or separated from the blade holding portion 4.

  A specific configuration of the fixing portion 7 is not limited. In the fixing portion 7 of the pipe cutter 1 according to the above-described embodiment, the first engagement portion 574 and the second engagement in which unevenness is repeated in the central axis C direction by reciprocating (sliding) the grip 57 in the central axis C direction. The portion 59 is engaged with or disengaged from, but is not limited to this configuration. For example, the fixing unit 7 may be configured to fix the operation unit 52 to the holding unit 55 by an engagement member such as a screw member. In other words, the fixing unit 7 may be configured to fix the operation unit 52 to the holding unit 55 so as to be releasable.

  DESCRIPTION OF SYMBOLS 1 ... Pipe cutter, 2 ... Pipe receiving member, 21 ... Rotating roller, 22 ... Rotating shaft, 23 ... Roller main body, 3 ... Roller blade, 4 ... Blade holding part (blade holding member), 41 ... Rotating shaft, 5 ... Operation Mechanism part (actuation mechanism), 51 ... slide shaft part, 511 ... screw hole, 52 ... operation part, 53 ... spring pressing member (pressing member), 531 ... small diameter part, 532 ... large diameter part, 54 ... biasing member, 55 ... Holding part, 551 ... Hollow part, 552 ... Inner peripheral surface, 553 ... Groove, 555 ... Through hole, 56 ... Rotating shaft part, 560 ... Rotating shaft body, 561 ... Screw part, 562 ... Flange part, 563 ... 1st part, 564 ... 2nd part, 57 ... Grip, 571 ... Inner peripheral surface, 571A ... End part region, 571B ... Adjacent region, 572 ... Projection, 573 ... Groove, 574 ... First engagement part, 575 ... convex portion, 575A ... inclined surface, 575B ... vertical surface, 58 ... transmission Material, 581 ... convex portion, 59 ... second engaging portion, 591 ... end region, 592 ... adjacent region, 593 ... convex portion, 593A ... inclined surface, 593B ... vertical surface, 6 ... frame, 61 ... first support Part 62 ... second support part 63 ... connecting part 7 ... fixing part 8 ... ring C ... center axis

A pipe cutter according to the present invention includes a pipe receiving member that receives a pipe rotatably around a central axis of the pipe, and a disk-shaped roller blade that extends in the same direction as the central axis of the pipe that the pipe receiving member receives. comprising a blade holding member which can be rotatably held around an axis, and a working mechanism for contacting and separating against the blade holding member to said pipe receiving member, wherein the actuating mechanism extends from said blade holding member, A rotating shaft portion having a slide shaft portion provided with a screw hole extending from the tip toward the blade holding member, and a screw portion extending in the central axis direction of the slide shaft portion and screwed into the screw hole at the tip. The operation unit including a rotation shaft portion rotatable around the central axis and the slide shaft portion are allowed to move in the central axis direction while preventing rotation around the central axis. And holding the operation unit , A holding portion for holding rotation around the central axis, and surrounding the rotation shaft portion in a circumferential direction of the rotation shaft portion, and capable of rotating around the center axis together with the rotation shaft portion. A pressing member and an elastically deformable spring coil for operating the operation portion so that the pipe receiving member and the blade holding member are brought close to each other while the roller blade is in contact with the pipe. with the deformation amount of the elastic deformation increases with, has a spring coil for urging the pipe receiving member of the blade holding member by the elastic force by elastic deformation, and the pivot shaft portion, the A flange portion extending in a direction perpendicular to the central axis at a position closer to the blade holding member than the pressing member in the central axis direction, and the spring coil is inserted through the rotating shaft portion along a spiral center Said in state Even disposed between the member and the flange portion, and elastic deformation when the roller blade is not in contact with the said pipe.

According to this configuration, when the roller blade is pressed against the pipe by the spring force of the spring coil and the pipe is cut, even if the spring force becomes the smallest, the predetermined spring force (the roller blade is the pipe) One of the pipe receiving member and the blade holding member is urged against the other member by the elastic force of the spring coil elastically deformed without being in contact with the roller member. Therefore, the generation of burrs at the cut portion can be effectively prevented.

Further , when the roller blade is brought into contact with the pipe received by the pipe receiving member, the blade holding member approaches the pipe receiving member (that is, not configured to move the pipe receiving member receiving the pipe). The displacement of the pipe from the pipe receiving member when the operation unit is operated is suppressed.

Further , the slide shaft portion can be reciprocated (slid) in the central axis direction by a simple operation such as rotating the operation portion, whereby the blade holding member can be brought into contact with or separated from the pipe receiving member.

Further, since the spring coil is disposed so as to surround the periphery of the rotation shaft portion (in a state where the rotation shaft portion is inserted along the spiral center), a space in which only the spring coil is disposed is provided and the space is provided. Compared with the case where the urging member is disposed on the spring coil , it is possible to secure the length of the spring coil in the spiral center direction while saving the space for disposing the spring coil .

In addition , since the holding member and the flange portion, which are in contact with both ends of the spring coil, are rotated along with the rotation of the rotating shaft portion, the spring coil is also rotated together with the rotating shaft portion. Even if the spring coil arranged between the two is always elastically deformed, the rotation operation of the operation portion is not hindered by the spring force of the spring coil .

Claims (6)

A pipe receiving member that receives the pipe rotatably about the central axis of the pipe;
A blade holding member capable of rotatably holding a disk-shaped roller blade around an axis extending in the same direction as the central axis of the pipe received by the pipe receiving member;
An operation mechanism, and an operation mechanism for bringing one of the pipe receiving member and the blade holding member into contact with and separating from the other member by operation of the operation unit,
The actuating mechanism is an elastically deformable urging member that operates the operation portion so that the pipe receiving member and the blade holding member are brought close to each other in a state where the roller blade is in contact with the pipe. And a biasing member that biases the one member toward the other member by an elastic force due to the elastic deformation, and the amount of deformation of the elastic deformation increases.
The urging member is a pipe cutter that is elastically deformed when the roller blade is not in contact with the pipe.   The pipe cutter according to claim 1, wherein the operating mechanism moves the blade holding member toward and away from the pipe receiving member. The operating mechanism is:
A slide shaft provided with a screw hole extending from the blade holding member and extending from the tip toward the blade holding member;
An operation unit that is rotatable about a central axis of the slide shaft unit, and an operation unit having a screw part screwed into the screw hole;
The slide shaft portion is held so as to allow movement in the direction of the central axis while preventing rotation around the central axis, and the operation portion is held so as to allow rotation around the central axis. The pipe cutter according to claim 2, further comprising: The operation portion includes a rotation shaft portion that extends in the central axis direction, has the screw portion at a tip, and is rotatable around the central axis.
4. The pipe cutter according to claim 3, wherein the urging member is a spring coil and is disposed in a state where the rotating shaft portion is inserted along a spiral center. The actuating mechanism has a pressing member that surrounds the rotating shaft portion in a circumferential direction of the rotating shaft portion and is rotatable around the central axis together with the rotating shaft portion,
The rotating shaft portion has a flange portion that extends in a direction orthogonal to the central axis at a position closer to the blade holding member than the pressing member in the central axis direction,
The pipe cutter according to claim 4, wherein the spring coil is disposed between the pressing member and the flange portion.   The pipe cutter according to any one of claims 3 to 5, wherein the operating mechanism has a fixing part capable of fixing the operation part.

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