JP2010005703A - Pipe cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe cutter for cutting pipes reliably, quickly, and safely at desired portions without pre-curing surrounding equipment and cables even in an extremely narrow space. <P>SOLUTION: Two holder frames each having a concave cantilever holding portion inside are pivotally supported by a common shaft at one end side and with the other side openable and closable and fit together into an annular shape as they are closed. The holder frame includes a cutter blade abutting on the outer periphery of a pipe in the annularly fit state. The holder frames are fit together annularly to form an annular shell body which is finger-hooked over its peripheral portion to be forcibly rotated around an axis of the pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe cutting cutter, and more particularly to a pipe cutter for cutting a relatively small diameter synthetic resin pipe.

Recently, pipe cutters are known that are lightweight and small and that can cut pipes with high accuracy without requiring power. For example, patent documents 1 and 2 have been proposed.
Japanese Patent Laid-Open No. 10-180531 JP 2002-144141 A

  In the pipe cutter of Patent Document 1, one end portions of a pair of frame bodies whose inner peripheral edges have a semicircular arc shape are connected by a hinge means so as to be openable and closable, a fixed handle is provided on one frame body, and the other frame body is rotated. A moving handle is provided, and a cutting blade projecting into a circular space formed with both frame bodies closed is connected to the rotating handle, and the pipe wrapped in the circular space is cut by the cutting blade. Is. Moreover, the pipe cutter of patent document 2 divides a plurality of abacus-shaped cutter blades into two groups around the pipe to be cut, and supports each of the groups on a frame 1 and a cutter plate 4 that can approach each other. The pipe is cut by rotating it around the pipe to be cut while allowing the frame 1 and the cutter plate 4 to approach each other. However, in the pipe cutter disclosed in Patent Document 1, the fixed handle and the rotating handle integrally connected to each frame body largely project on the outer periphery of the pipe to be cut and rotate, so that the communication cable including, for example, an optical communication cable or the like As in the work in the manhole, etc., a plurality of cable lines pass through the same pipe line and cannot be applied to pipe cutting work in an extremely narrow portion where a slight damage or breakage is not allowed. Even a slight damage to the communication cable may block communication or cause troubles over a wide area. The pipe cutter disclosed in Patent Document 2 is also a feed screw in a state where the cutter guide 24 is largely overhanged from the frame 22 that supports the cutter guide 24 in order to push the cutter guide 24 in the proximity direction with respect to the cutter plates 25 and 25 ′. 21 and the handle 20 have to be attached, and there is a problem that it cannot be used for pipe cutting work in an extremely narrow portion. That is, it is directly practical for pipe cutting work in ultra-narrow parts where peripheral equipment etc. are not allowed to be slightly damaged or broken like pipe cutting work in work areas where optical communication cables etc. are arranged in the vicinity. There is no pipe cutter. Actually, when working in such a work area, as shown in FIG. 12, cables other than the object to be cut are covered with a sheet or the like and cured. The cutting work must be carried out little by little while paying attention to the cable, and the curing work is necessary. Also, the cutting work itself takes a long time, and there is a problem that the overall pipe line work efficiency is lowered.

  The present invention has been made in view of the above-described conventional problems, and the purpose of the present invention is to ensure that the surrounding equipment and cables are not subjected to curing work in advance even in a very narrow space of around several centimeters. An object of the present invention is to provide a pipe cutter capable of quickly and safely cutting pipes at a desired site.

  In order to achieve the above object, the present invention has arc-shaped concave gripping portions 43a and 43b on the inner side, each of which is pivotally attached at one end 56 and the other end 58 can be freely opened and closed. The gripping frame pair 12 that grips the pipe 1 to be cut in the one gripping part so as to be orthogonal to the longitudinal direction thereof, the cutter blade 14 attached to the one gripping parts 43a and 43b, and the gripping frame pair Connecting means (16) for releasably connecting the other end side of the grip 12, and the grip frame pair 12 constitutes a three-dimensional annular shell S formed in a ring shape with a required width when closed, and the grip frame When the pair 12 is closed, there is no protrusion in the radial direction from the outer periphery of the width portion of the annular shell S, and the outer peripheral contour of the annular shell S is formed only by the grip frames 40 and 42. Pipe bracket Consisting of over 10. For example, when the gripping frame pair 12 is closed, a part of the gripping frame pair is hung from the outside with the thumb Uf, and the fingers Pf, Mf, Tf other than the thumb of the same hand are applied to the frame width portion of the gripping frame pair. When the entire outer shell S of the pair 12 is rotated, a protruding portion that is a frame width portion of the gripping frame pair 12 and prevents a clue of other fingers Pf, Mf, Tf other than the thumb on the outer peripheral portion of the gripping frame pair 12 Is configured not to exist. In the pipe cutter of the present invention, two gripping frames each having an arc-shaped concave gripping portion inside are pivotally supported at one end side by a common shaft, and the other end side can be freely opened and closed, and are assembled in an annular shape when closed. A cutter blade that hits the outer periphery of the pipe in an annularly assembled state protrudes from the one gripping portion. An annular shell is formed in an annularly assembled state, the pipe to be cut is sandwiched between one gripping part, and the entire annular shell is forced around the pipe axis while hanging the outer periphery of the annular shell with fingers. , The pipe is cut by cutting the outer periphery of the pipe in the circumferential direction with the cutter blade hit. By constructing the annular shell with a three-dimensional annular frame structure that can be handled without providing a projecting portion around the circumference, reliable pipe cutting is realized in an extremely narrow space.

  In this case, the connecting means comprises a connecting device 16 that connects the open / close end sides of the grip frames 40 and 42 that open and close so as to surround the periphery of the pipe so as to be close to and away from each other, and the connecting device 16 is a side surface of the grip frame pair 12 in the closed state. It is good if it is the side and it is protrudingly provided in the side surface side used as the longitudinal direction aa 'end part side of the pipe 1 to be cut.

  Further, the rotation operation handles 50 and 80 may be extended in the direction along the longitudinal direction of the pipe 1 to be cut, which is one or both side surfaces of the grip frame pair 12.

  In addition, when the grip frame pair 12 is closed, a part of the grip frame pair 12 is hung from the outside with the thumb Uf, and the rotation operation handles 50 and 80 by other fingers Pf, Mf, and Tf other than the thumb of the same hand are hung. In addition, it is preferable that the projecting portion does not exist in the frame width portion of the entire outer shell of the gripping frame pair 12 so that at least three fingers that are continuous from the index finger Pf are hung side by side at substantially equal intervals.

  Further, the coupling device 16 is close to the opening / closing end side of each gripping frame 40, 42, and the axial movement support bracket 98 of the bolt 96 with the stopper 97 attached to one gripping frame 42 side, and the other gripping. It is further preferable that the support bracket 98 and the lock receiving bracket 66 are pivotally supported by the holding frames 40 and 42, respectively.

  According to the pipe cutter of the present invention, each side has a circular concave concave gripping portion, each of which is pivotally attached at one end side, and the other end side can be freely opened and closed. A pair of gripping frames for gripping the pipe to be cut so as to be orthogonal to the longitudinal direction thereof, a cutter blade attached to one gripping part, and a connecting means for connecting the other end side of the gripping frame pair so as to be freely disengaged, The grip frame pair constitutes a three-dimensional annular shell formed in an annular shape with a required width when closed, and projects radially from the outer periphery of the width portion of the annular shell when the grip frame pair is closed Since the outer peripheral contour of the annular shell is formed only by the gripping frame, even if the working space around the cable to be cut is a very narrow space with a radius of several centimeters, it is preliminarily attached to surrounding devices and cables. Without performing the raw work reliably, quickly, and safely can be carried out tubing cleavage at a desired site.

  The connecting means comprises a connecting device for connecting the opening and closing end sides of the gripping frame that opens and closes so as to surround the periphery of the pipe so as to be close to and away from each other. This is a configuration that is provided so as to project from the side surface that is the longitudinal end portion side of the pipe, so that a configuration that does not project in a radial direction from the outer periphery of the width portion of the annular shell is specifically described. realizable.

  Moreover, it is one or both sides of a grip frame pair, and it is set as the structure which extended the rotation operation handle in the direction along the longitudinal direction of the pipe to cut | disconnect, from the outer periphery of the width | variety part of an annular shell to radial direction Pipes can be cut smoothly and quickly by providing a handle for rotating the entire annular shell with a structure in which there is no projecting object.

  In addition, when the gripping frame pair is closed, an aspect in which a part of the gripping frame pair is hung with the thumb from the outside and a rotation operation handle with other fingers other than the thumb of the same hand is hung is at least three fingers continuous from the index finger. The structure is such that no protrusions are present in the frame width part of the entire outer shell of the grip frame pair so that they are hung side by side at substantially equal intervals. Thus, when the annular shell is rotated and the annular shell is forcibly rotated, a force in the rotational direction can be easily applied effectively, and the pipe can be cut smoothly.

  Further, the coupling device is close to the opening / closing end side of each gripping frame, and has an axial movement support bracket of a bolt with a stopper attached to one gripping frame side, and a bolt shaft attached to the other gripping frame side. And the brackets are supported by the respective holding frames so that both brackets are respectively on the same side of the first and second holding frames. The semicircular frame plates 44a and 45a are pivotally supported around the support shafts 68 and 100. Further, when adjusting the tightening by rotating the bolts in the axial direction, they are synchronized with the linear movement of both brackets. Since the tip end of each bracket can be rotated around the support shaft, the tightening operation with the bolts is smooth and the workpiece to be cut is clamped. The first contact range to up the curved surface is smaller to clarify the determination of the cutting position, no further explore cutting, it is possible to finish clean cut surface.

  Next, an embodiment of a pipe cutter according to the present invention will be described in detail with reference to the accompanying drawings. The pipe cutter according to the present embodiment is accurate, reliable and safe even in an extremely narrow working space in which the peripheral gap in the direction perpendicular to the longitudinal direction of the pipe is only about 4 centimeters, for example, when cutting pipes. This is a pipe cutter that can perform a cutting operation. For example, as shown in FIGS. 10 and 11, an example is shown that is applied at the time of laying a communication cable in a work manhole M installed in the ground.

  In FIG. 10, for example, work manholes M are installed in the ground at intervals of several hundred meters, and the communication lines L1 and L2 are installed in the ground by connecting these manholes. For example, a metallic line cable CM is connected to the communication line L1 and is laid through a plurality of manholes M. An existing optical line cable CR is in communication with the communication line L2 together with the synthetic resin pipe D for cable insertion. Then, another optical line cable CR is newly laid in the synthetic resin pipe D. At this time, as shown in FIG. 11, the pipe D is drawn out from the large drum on the ground side, and the inside of the communication line L2. So that the pipe D is accommodated. The pipe D is cut at a P position that protrudes about 10 centimeters, for example, about 10 centimeters from the opening of the communication line L2 to the indoor side of the manhole M. It is designed to pass the line cable. The working environment when cutting the pipe D at the projecting position P from the opening of the communication line L2 at this time is that the existing optical line cable CR is engaged in the same communication line as shown in FIG. Further, other communication lines L1, L3,... Are arranged at positions close to the communication line L2, and the space allowed for the cutting work of the flexible pipe as a pipe is 10 with the existing optical line cable CR. It is an environment where there are only centimeter protruding positions, for example, only about 40 millimeters.

  FIGS. 1 to 9 show the pipe cutter of this embodiment. As shown in FIGS. 1 to 4, the pipe cutter 10 is pivotally attached to one end side by a common shaft, and the other end side is opened and closed. It consists of a pair of gripping frames that can be closed together and assembled in an annular shape with the required width.

  That is, the pipe cutter 10 of the embodiment includes the grip frame pair 12 including the first and second grip frames 40 and 42, the cutter blade 14, and the coupling device 16. As shown in FIG. 6, the first and second gripping frames 40 and 42 constituting each element of the gripping frame pair 12 have one end side on a plane perpendicular to the longitudinal direction of the pipe to be cut as a common axis. It is pivotally attached and assembled so as to open and close the other end side. As shown in FIGS. 3 and 4, the first and second gripping frames 40 and 42 have an annular shell S having a certain lateral width when viewed from the direction orthogonal to the longitudinal direction of the pipe, with the open / close end side closed and connected. For example, it is formed in the size and shape of the outer shell so that the whole can be grasped by about one-third to two-thirds with one hand of the operator.

  The gripping frames 40 and 42 are each composed of a semi-circular or half-striped horseshoe-shaped three-dimensional frame when viewed from one side, which is the front surface (the side surfaces on both ends in the longitudinal direction of the pipe to be cut). The single gripping portions 43a and 43b are provided. In the piece gripping portions 43a and 43b, the pipe D to be cut is orthogonal to the longitudinal direction aa ′ in a state where both the gripping frames 40 and 42 are closed and connected and the piece gripping portions 43a and 43b are aligned with each other. Hold as you do.

  Specifically, in FIGS. 4 and 5, the first gripping frame 40 includes a pair of semicircular frame plates 44 a and 44 b that are spaced apart from each other and have a certain plate width, and their semicircular frame plates. A width connecting member 46 having a connecting spacer function provided in the separation gaps 44a and 44b and a plurality of idle rollers 47 are included. The width connector 46 is used to connect the first gripping frame 40 as a semicircular three-dimensional frame body, and is a cylindrical member or solid rod for fixedly connecting both the semicircular frame plates 44a and 44b. Consists of the body. Further, the idle roller 47 has an auxiliary function of smooth cutting of the pipe 1 to be cut sandwiched between the single gripping portions 43a and 43b. Specifically, a part of the idler roller 47 is semicircular frame plate 44a. , 44b, two idle rollers 47, 47 are mounted so as to be free to protrude from a ring-shaped inner edge formed in the ring shape, and a part of the peripheral surface protrudes inside the ring-shaped inner edge. A rotating operation handle 50 is attached to an intermediate position between the two idle rollers.

  The rotation operation handle 50 is a rotation operation assisting means for rotating the entire annular shell S around the longitudinal axis of the pipe along a plane orthogonal to the longitudinal direction of the pipe 1, and is a semicircular frame plate 44a. , 44b and a short rod 52 that protrudes away from each other along the longitudinal direction of the pipe. The short rod 52 protrudes only from the side of the pipe in the longitudinal direction without protruding from the shell periphery of the annular shell S. In the present embodiment, support rods having the same diameter as those of the short rods 52 are fixed to the gap portions of the semicircular frame plates 44a and 44b corresponding to the projecting portions of the short rods 52, and both the semicircular frame plates 44a and 44b are fixed. It is connected. The short rod 52 is formed with a protruding length such that, for example, an index finger or a ring finger is hung in the crossing direction during operation. In particular, as shown in FIG. 9, when the first and second gripping frames are closed and connected to form a gripping frame pair, a part of the gripping frame pair is hung with the thumb from the outside, and other than the thumb Uf of the same hand. In this embodiment, the entire outer shell S of the pair of gripping frames 12 is placed so that at least three fingers Pf, Mf, Tf continuous from the index finger Pf are hung side by side at a substantially equal interval. It is formed so that it can be grasped.

  In FIGS. 1, 2, 4, 5, and 6, the first gripping frame 40 is pivotally attached to one end side of a second gripping frame 42, which will be described later, by a common shaft 54 to form a pivoting portion 56. The other end side and the other end side of the second grip frame 42 form an opening / closing part 58. A portion corresponding to the opening / closing portion 58 of the first gripping frame 40 is provided with a semi-circular frame plate 44a, 44b, which is provided with opposing projecting portions 60 extending from the main body, which are constituted by spaced parallel plates. Further, one semicircular frame plate 44a of the first gripping frame 40 is attached with a connection receiving tool 62 protruding laterally (in the longitudinal direction of the pipe gripped for cutting). The connection receiving tool 62 is a first opening / closing connection element of the connection device 16, and specifically, a base part 64 and a receiver projecting in the longitudinal direction of the pipe 1 in an L shape from the distal end side of the base part 64. The latch receiving bracket 66 which consists of the part 65 is comprised. The base end side of the pedestal portion 64 is rotatably supported by the support shaft 68 so that the distal end receiving portion 65 side can freely rotate about the axis. The receiving portion 65 includes a U-shaped groove 65a that is partially opened.

  The second grip frame 42 has a certain plate width and a pair of semicircular frame plates 45a and 45b arranged to face each other, and a connection provided in the gap between the semicircular frame plates 45a and 45b. A second width connecting member 48 having a spacer function and a cutter blade 14 attached to the second width connecting member 48, and the second connecting frame 40 is assembled as a semicircular solid frame body by the width connecting member 48. Connect. The width coupler 48 supports the cutter blade 14 at the same time. In the embodiment, as shown in FIGS. 1, 2, 4 and 6, the width connector 48 extends over an arc length of about two-thirds of the semicircular frame plate. Both frame plates are connected and assembled as a semicircular solid frame body in a state where a block-like width connector 48 is sandwiched between two semicircular frame plates 45a and 45b like a spacer. The cutter blade 14 is mounted and fixed by projecting a linear blade tip so as to form a chord with respect to the arc from the inner circular or elliptical portion formed by the grip frame pair 12 supported by the width coupler. ing.

  Further, a second rotation operation handle 80 is attached to a position near the opening / closing portion of the second grip frame 42. The second rotation operation handle 80, together with the first rotation operation handle 50, rotates when the entire annular shell S is rotated about the longitudinal axis of the pipe along a plane perpendicular to the longitudinal direction of the pipe 1. Provide dynamic operation assistance. In the embodiment, the second rotation operation handle 80 is composed of one short rod 82 that is formed to project from one semicircular frame plate 45b along the longitudinal direction of the pipe. The short rod 82 is formed of a cylindrical member having the same diameter and length as the short rod 52, and is attached to a circumferential position different from the first rotation operation handle 50 at an inner circular position formed by closing and forming a grip frame pair. It has been. In addition, the function of the operation handle may be the first rotation operation handle, but the provision of the second rotation operation handle increases the number of clues at different circumferential positions, and the specific situation at the work site. The rotation operation can be facilitated depending on the situation. One end side of the second gripping frame 42 is pivotally attached to one end side of the first gripping frame 40 described later by a common shaft 54 to form a pivoting portion 56, and the other end side is the other end side of the first gripping frame 40. At the same time, an opening / closing part 58 is formed.

  A portion corresponding to the opening / closing portion 58 of the second gripping frame 42 is provided with a semi-circular frame plate 45a, 45b, which is provided with an opposing projecting portion 84 formed from a spaced parallel plate. The spaced parallel plate of the opposing projecting portion 84 of the second gripping frame 42 projects with a narrower gap width than the spaced parallel plate of the opposing projecting portion 60 of the first gripping frame 40. 1 is sandwiched and closed, the spaced parallel plate of the opposed projecting portion 84 can be inserted into the gap width of the spaced parallel plate of the opposed projected portion 60 so that the idler roller on the first gripping frame side It hits 47 and stops.

  Furthermore, one semicircular frame plate 45a of the second gripping frame 42 has a side that is in the same direction as the mounting projecting side of the connection holder 62 of the first gripping frame (longitudinal direction of the pipe gripped for cutting). A connecting tool 90 is attached so as to protrude. The connection tool 90 is a component of the opening / closing connection means that forms the connection device 16 together with the connection receiver 62 of the first grip frame 40. Specifically, in the present embodiment, the connector 90 includes a base portion 92 and a nut portion 94 that is bent in an L shape from the base portion 92 and integrally connected to the nut portion 94 to be screwed into the central axis of the nut. It comprises a support bracket 98 including a bolt 96 that moves forward and backward in the direction. And the base end side of the base part 92 is rotatably supported by the support shaft 100, and the nut part 94 side of the front end can be freely rotated around the axis. The bolt 96 is engaged with the U-shaped groove 65a of the receiving portion 65 of the first gripping frame 40 in a state where the pipe 1 is sandwiched between the one gripping portions 43 and the open / close end side is closed, and is screwed back and forth in that state. Thus, the pinching strength of the pipe 1 can be adjusted. In this case, the bolt head of the bolt 96 is used as the stopper 97, and the bolt is prevented from coming off while the bolt shaft is inserted through the U-shaped groove 65a. In the embodiment, the bolt head is formed of a cylindrical body having a knurled outer periphery, and a hexagonal hole as a rotation input hole is formed in the end face.

  As described above, when the gripping frame pair 12 is closed, the annular shell S is formed, and a part of the gripping frame pair is hung with the thumb from the outside, and the turning operation by other fingers other than the thumb of the same hand When the handle is hung, it has a structure in which no protrusion is present on the outer peripheral portion of the frame width H of the entire outer shell, that is, the width H of the annular shell S. It is possible to stably and smoothly perform the rotating operation of the entire annular shell.

  Next, the operation of the pipe cutter 10 of this embodiment will be described with reference to the drawings. For example, in the working conditions as shown in FIG. 12, when the gap that can be provided between adjacent cables is only about 4 centimeters, as shown in FIG. The open / close end sides of the first and second grip frames 40, 42 are opened, and the open side is brought close to the pipe in that state, and the pipe 1 is sandwiched along the longitudinal section of the pipe 1 to be cut. Install so that it surrounds. At this time, on the other end side of the first and second gripping frames 40 and 42, the locking receiving bracket 66 and the support bracket 98 of the coupling device 16 are rotated from the nut portion 94 to some extent while rotating around the support shafts 68 and 100, respectively. The bolt shaft of the bolt 96 projecting from the head side is engaged in the U-shaped groove 65a of the receiving portion 65 and is prevented from coming off by the stopper 97 to form a closed and connected gripping frame pair 12. In this state, the bolt is rotated in the axial direction by a small hexagon wrench or the like from the rotation input hole of the bolt head of the stopper 97 (see FIG. 7), and tightened as shown in FIGS. 1 is prepared so as to be arranged on the outer periphery of the shaft 1 in the axial orthogonal cutting direction. At this time, the latch receiving bracket 66 and the support bracket 98 are rotatably supported around the support shafts 68 and 100 on the semicircular frame plates 44a and 45a on the same side surface side of the first and second gripping frames, respectively. The axial line of the bolt 96 formed in a state where it is engaged with the nut portion 94 of the support bracket 98 and the bolt head portion of the latch receiving bracket 66 is tightened so as to be substantially perpendicular to the cutting edge line 200 of the straight blade 14. Since the brackets 66 and 98 are rotated via the both support shafts 68 and 100, the rotational movement around the pivoting portion 56 synchronized with the linear movement of both brackets by tightening the bolts can be smoothly realized. .

  In this state, the annular shell S is formed, and as shown in FIG. 9, a part of the grip frame pair is hung from the outside with the thumb Uf, and other fingers Pf, Mf, Tf other than the thumb of the same hand are hung on the grip frame. Apply to the frame width of the pair. At this time, if each fingertip portion is applied to the rotation operation handles 50 and 80, force is effectively applied, and in this state, the entire outer shell of the grip frame pair is rotated. Then, as shown in FIG. 8, a stable tube cutting operation can be performed with the rotation trajectory fixed by the idle roller 47 and the cutter blade 14. When the annular shell S is rotated, it is sufficient that the annular shell S can be rotated in a circumferential range having a radius Hd from the tube center 1a to the bolt tip 96a in FIG. Therefore, even in a conventional work site where the distance between adjacent cables, for example, is only about 4 centimeters, the cutting operation can be performed easily and smoothly.

  As described above, the pipe cutter of the present embodiment described in detail is included in the present invention even if arbitrary changes are made without departing from the essence of the present invention. For example, the number of idle rollers, the shape of the specific cutter blade, the manner of contact with the pipe, the position in the circumferential direction of the rotation operation handle, the number, etc. can be arbitrarily set.

  The pipe cutter of the present invention can be applied not only to cutting a pipe in a very narrow area but also to cutting a pipe in a place where such a restriction is not applied.

It is a front view of a pipe cutter concerning an embodiment of the present invention. It is a rear view of the pipe cutter of FIG. It is a top view of the pipe cutter of FIG. It is a perspective explanatory view of the attachment state to the cutting object pipe of the pipe cutter of FIG. It is the perspective explanatory view which isolate | separated and showed the 1st, 2nd holding frame of the pipe cutter of FIG. It is effect | action explanatory drawing which shows the motion of the pipe cutter of FIG. It is action | operation explanatory drawing of the pipe cutter of FIG. It is action | operation explanatory drawing of the pipe cutter of FIG. It is explanatory drawing which shows the grip state by the hand at the time of the cutting | disconnection operation | work using the pipe cutter of FIG. It is a section explanatory view explaining the cutting work site of a pipe cutter concerning an embodiment. It is installation explanatory drawing of the pipe in the cutting work site of the pipe cutter which concerns on embodiment. It is explanatory drawing which shows the pipe cutting operation state in the conventional manhole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe to be cut 10 Pipe cutter 12 Grip frame pair 14 Cutter blade 16 Connecting device 40 First grip frame 42 Second grip frame 43a, 43b Single gripping portions 44a, 44b Semi-circular frame plates 45a, 45b Semi-circular frame plates 50 Rotation Operation handle 56 Pivoting part 58 Opening / closing part 66 Locking receiving bracket 96 Bolt 97 Locking part 98 Support bracket

Claims (5)

Each side has an arc-shaped concave gripping part, one end of each is pivoted and the other end can be opened and closed, and it is assembled in an annular shape when closed. A pair of gripping frames gripping to be orthogonal to
A cutter blade attached to one gripping part;
Coupling means for releasably coupling the other end side of the grip frame pair,
The grip frame pair constitutes a three-dimensional annular shell that is annularly formed with a required width when closed,
A pipe cutter characterized in that, when the gripping frame pair is closed, there is no projecting in the radial direction from the outer periphery of the width portion of the annular shell, and the outer contour of the annular shell is formed only by the gripping frame. . The connecting means consists of a connecting device that connects the opening and closing end sides of the gripping frame that opens and closes so as to surround the periphery of the pipe so as to be close to and away from each other.
2. The connection device according to claim 1, wherein the connection device is provided on a side surface side of the pair of gripping frames in a closed state so as to project from a side surface side which is a longitudinal end portion side of a pipe to be cut. Pipe cutter.   The pipe cutter according to claim 1 or 2, wherein a rotation operation handle is extended in a direction along a longitudinal direction of the pipe to be cut, which is one or both side surfaces of the grip frame pair. A mode in which a part of the grip frame pair is hung with the thumb from the outside when the grip frame pair is closed, and a rotation operation handle by a finger other than the thumb of the same hand is hung.
4. The structure according to claim 3, wherein there is no protrusion in the frame width portion of the entire outer shell of the gripping frame pair so that at least three fingers that are continuous from the index finger are hung side by side at substantially equal intervals. Pipe cutter. The coupling device is close to the open / close end side of each gripping frame, and is an engagement member for supporting the axial movement of the bolt with stopper attached to one gripping frame side and the bolt shaft attached to the other gripping frame side. The pipe cutter according to any one of claims 1 to 4, wherein the support bracket and the lock receiving bracket are pivotally supported by respective holding frames.

Images