JP2020015144A - Pipe cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe cutter capable of adjusting the amount of advance of a cutting blade, having good work efficiency and good operability. SOLUTION: First and second arcuate frame bodies 10, 20, a cutting edge portion 30, and one end sides of the first arcuate frame body 10 and the second arcuate frame body 20 are pivotally attached. The pivotal attachment portion 40, the connecting portion 50 that releasably connects the other end side, and the at least one of the first and second arcuate frame bodies 10 and 20 are attached to the arcuate frame body to be cut. The cutting blade portion 30 is provided with a contact roller 60 that comes into contact with the outer peripheral surface of the pipe, and the cutting blade portion 30 holds the cutting blade 31 rotatably and is rotatably mounted between a pair of semicircular frame bodies. A cutting blade holder 32 and a moving fixing mechanism 33 that can move the cutting blade holder 32 to and from the center of the arc of the arc-shaped frame and can be fixed at a desired position. This is a pipe cutter capable of adjusting the amount of advance of the cutting blade in the direction of the arc of the arc-shaped frame. [Selection diagram]

Description

  The present invention relates to a pipe cutter rotatably mounted on an outer periphery of a pipe to be cut, and cutting the pipe to be cut from an outer diameter side thereof by a cutting blade which is in contact with an outer peripheral surface of the pipe to be cut.

Various pipes such as a metal pipe and a synthetic resin pipe are used in various places as a pipe through which a liquid or a gas flows (hereinafter, referred to as a pipe). Since these pipes adhere to scale or corrode with long-term use, it is necessary to periodically exchange the pipes. When replacing the pipe, if it is necessary to cut the pipe, the pipe is generally cut using a pipe cutter.
As a prior art showing such a pipe cutter, for example, there is Patent Document 1 below.

Japanese Patent No. 521802

The technique disclosed in Patent Document 1 is an invention relating to a pipe cutter. Even in an ultra-small space where the circumference of a cable to be cut is about several centimeters, it is possible to reliably, quickly and safely perform a curing operation on peripheral devices and cables in advance without performing a curing operation. There is an advantage that the tubing can be cut at the site.
However, in the technique of Patent Document 1, there is no configuration capable of adjusting the amount of advance of the cutter blade toward the center of the arc of the pair of semi-circular gripping frames, and the amount of advance of the cutter blade is adjusted according to the pipe to be cut. There was a problem that it was not possible.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems, and has an object to provide a pipe cutter which can adjust the amount of advance of a cutting blade, has good work efficiency, and has good operability.

In order to achieve the above object, a pipe cutter of the present invention is rotatably mounted on an outer periphery of a pipe to be cut, and cuts the pipe to be cut from an outer diameter side thereof by a cutting blade abutting on an outer peripheral surface of the pipe to be cut. A first and a second arc-shaped frame in which a pair of semi-circular frames are opposed to each other, the first arc-shaped frame, and the second arc-shaped. A cutting blade portion having a cutting blade attached to at least one of the arc-shaped frame bodies and one end side of the first arc-shaped frame body and the second arc-shaped frame body; A pivoting portion, a connecting portion for connecting the other end side of the first arc-shaped frame and the second arc-shaped frame so as to be able to release the connection, the first arc-shaped frame, Outer circumference of the pipe to be cut attached to at least one of the two arc-shaped frames A cutting roller which is rotatably mounted between the pair of semicircular frames while holding the cutting blade in a rotatable manner. And a movable fixing mechanism capable of moving the cutting blade holder in the direction of the center of the arc of the arc-shaped frame so as to be able to move back and forth, and fixing the cutting blade holder at a desired position. The first feature is that the amount of advance of the cutting blade toward the center of the arc can be adjusted.
Further, in the pipe cutter of the present invention, in addition to the first feature, the moving and fixing mechanism includes a nut held between the cutting blade holders, a bolt screwed to the nut, and movement of the bolt in the longitudinal direction. The nut is made to move forward and backward in the longitudinal direction of the bolt by rotating the bolt forward or negative, thereby moving the cutting blade holder toward the center of the arc of the arc-shaped frame. The second feature is that the cutting blade holder can be fixed at a desired position by the movement restricting portion while being able to move forward and backward freely.
A third feature of the pipe cutter according to the present invention is that the nut is sandwiched between the cutting blade holders so as to be rotatable in the circumferential direction of the arc-shaped frame.
A fourth feature of the pipe cutter according to the present invention is that, in addition to any one of the first to third features, the contact roller includes a mechanism capable of moving forward and backward in the direction of the center of the arc of the arc-shaped frame. And
The pipe cutter according to the present invention, in addition to any one of the first to fourth features described above, further comprises a first jig and a second arc-shaped frame which are engaged with a rotating jig for rotating the pipe cutter. A fifth feature is that an engaging portion is provided.
Further, in addition to any one of the first to fifth features, the pipe cutter of the present invention can rotate the pipe cutter by receiving the rotational force of the rotary driving device on the first and second arc-shaped frames. The sixth feature is that a rotational force passive member is provided.

According to the pipe cutter according to the first aspect, the pipe to be cut is rotatably mounted on the outer circumference of the pipe to be cut, and the pipe to be cut is cut from the outer diameter side by a cutting blade that comes into contact with the outer peripheral surface of the pipe to be cut. A pipe cutter, in which a pair of semicircular frames are arranged to face each other, first and second arc frames, the first arc frame, and the second arc frame. A cutting edge portion having a cutting blade attached to at least one of the arc-shaped frames; and a pivotal connection for pivotally connecting one end side of the first arc-shaped frame and the second arc-shaped frame. A connecting portion for connecting the other end side of the first arc-shaped frame and the second arc-shaped frame so as to be able to release the connection, the first arc-shaped frame, and the second It is attached to at least one of the arc-shaped frame members and the outer peripheral surface of the pipe to be cut. A cutting roller, a cutting blade, a cutting blade, a cutting blade holder that rotatably holds the cutting blade and is rotatably mounted between a pair of semicircular frame bodies, A moving and fixing mechanism that can move the cutting blade holder in the direction of the center of the arc of the arc frame and can fix the cutting blade holder at a desired position; and the center of the arc of the arc frame is moved by the moving and fixing mechanism. Since the amount of advance of the cutting blade in the direction is adjustable,
By providing the moving and fixing mechanism, it is possible to provide a pipe cutter capable of appropriately adjusting the amount of advance of the cutting blade to a desired amount. Also, it can be easily attached to and detached from the outer periphery of the pipe to be cut via the connecting portion. Therefore, a pipe cutter with good work efficiency and good operability can be obtained.

According to the pipe cutter of the second aspect, in addition to the effect of the first aspect, the moving and fixing mechanism includes a nut sandwiched between the cutting blade holders, a bolt screwed to the nut, The nut comprises a movement restricting portion for restricting the movement of the bolt in the longitudinal direction, and by rotating the bolt forward or negatively, the nut is moved forward and backward in the longitudinal direction of the bolt, whereby the cutting blade holder is moved. Since the cutting blade holder can be fixed at a desired position by the movement restricting portion, while being capable of moving forward and backward in the direction of the center of the arc of the arc-shaped frame,
The amount of advance of the cutting blade in the direction of the center of the arc of the arc-shaped frame can be appropriately adjusted only by the rotation operation of the bolt, so that a pipe cutter with higher working efficiency and better operability can be obtained.

Further, according to the pipe cutter according to the third aspect, in addition to the operation and effect according to the first or second aspect, the nut is attached to the cutting blade holder so as to be rotatable in the circumferential direction of the arc-shaped frame. Because it is pinched,
When the cutting blade holder rotates toward the center of the circular arc of the arc-shaped frame, the posture angle of the nut can effectively follow the posture angle of the cutting blade holder. Accordingly, the inclination angle of the bolt with respect to the nut can be adjusted to an appropriate angle, and the moving range of the nut in the longitudinal direction of the bolt can be effectively widened. Therefore, the amount of advance of the cutting blade can be effectively increased, and a pipe cutter capable of further adjusting the amount of advance of the cutting blade to a desired amount can be obtained. Therefore, it is possible to obtain a pipe cutter with higher working efficiency and better operability.

According to the pipe cutter of the fourth aspect, in addition to the function and effect of any one of the first to third aspects, the contact roller has a mechanism capable of moving forward and backward in the direction of the center of the arc of the arc-shaped frame. Because it has
The pipe cutter can easily follow the outer peripheral surface of the pipe to be cut even when the outer peripheral surface of the pipe to be cut has irregularities. Therefore, a pipe cutter with higher cutting accuracy can be obtained.

According to the pipe cutter of the fifth aspect, in addition to the operation and effect of any one of the first to fourth aspects, the pipe cutter can be rotated by the first and second arc-shaped frames. Since it has an engagement portion that engages with the rotation jig,
When rotating the pipe cutter, a rotating jig can be used, and a pipe cutter capable of simultaneously improving work efficiency and reducing work load can be provided.

According to the pipe cutter of the sixth aspect, in addition to the operation and effect of any one of the first to fifth aspects, the rotational force of the rotary driving machine is added to the first and second arc-shaped frames. Since it has a rotational force passive member that can rotate the pipe cutter in response to
The pipe cutter can be rotated by using the rotary driving device, so that the pipe cutter can be further improved in work efficiency and work load can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the pipe cutter which concerns on embodiment of this invention, (a) is a front view, (b) is a perspective view which shows the state which attached the pipe cutter to the pipe to be cut. It is a figure which shows the pipe cutter which concerns on embodiment of this invention, (a) is a front view which shows the state which opened the connection part, (b) is a perspective view which shows the state which opened the connection part. It is a figure which shows the pipe cutter which concerns on embodiment of this invention, (a) is a top view, (b) is a schematic diagram which shows the principal part of (a). It is an exploded perspective view showing a pipe cutter concerning an embodiment of the present invention. It is a schematic diagram which shows the principal part of the pipe cutter which concerns on embodiment of this invention. In the pipe cutter according to the embodiment of the present invention, in a diagram schematically illustrating a state in which the amount of advance of the cutting blade is adjusted, (a) illustrates a state before adjustment, and (b) illustrates a state after adjustment. FIG. It is a figure which shows the pipe cutter which concerns on embodiment of this invention, and the modification of the pipe cutter which concerns on embodiment of this invention, (a) is a front view which shows the state which rotates a pipe cutter using a jig for rotation, (B) is a front view which shows the modification of the pipe cutter which concerns on embodiment of this invention.

  Hereinafter, a pipe cutter according to an embodiment of the present invention will be described with reference to FIGS. However, the following description does not limit the invention described in the claims.

As shown in FIG. 1, a pipe cutter 1 according to an embodiment of the present invention is formed of a metal such as steel constituting a cooling and heating machine (a so-called absorption chiller / heater or the like) installed in a large commercial facility or a station building. It is a pipe cutter used in an operation for cutting a pipe. More specifically, as shown in FIG. 1B, the pipe 100 is rotatably attached to the outer periphery of the pipe 100 and cut from the outer diameter side of the pipe 100 by a cutting blade 31 that comes into contact with the outer peripheral surface of the pipe 100. It is a pipe cutter like this.
Further, the pipe cutter 1 of the present embodiment is configured such that when cutting the pipe 100, the operator directly rotates the pipe cutter 1 by hand and, as shown in FIG. The pipe 100 can be cut either by engaging with the pipe cutter 1 and rotating it. More specifically, when there is a sufficient space around the pipe 100, the pipe 100 is cut by rotating the pipe cutter 1 using the rotating jig 70. On the other hand, when there is not enough space around the pipe 100, the operator directly rotates the pipe cutter 1 by hand to cut the pipe 100.

  As shown in FIGS. 1 to 4, the pipe cutter 1 includes a first arc-shaped frame 10, a second arc-shaped frame 20, a cutting blade 30, a pivoting part 40, and a connecting part. 50 and a contact roller 60.

The first arc-shaped frame 10 forms a skeleton of the pipe cutter 1. The first arc-shaped frame body 10 includes a pair of frame bodies 11 and 12 and a connecting pin 13 for connecting the pair of frame bodies 11 and 12 by opposing each other. In the present embodiment, the frames 11, 12 and the connecting pins 13 are formed of steel.
As shown in FIG. 2B and FIG. 4, the first arc-shaped frame body is formed by connecting the pair of semicircular frame bodies 11 and 12 using the connecting pin 13 in a state where the frame bodies are opposed to each other. 10 are formed. Specifically, the frame 11 and the frame 12 are arranged to face each other, and a fitting recess 11 a provided on the inner surface 11 c of the frame 11 and a fitting recess (not shown) provided on the inner surface 12 c of the frame 12. The first arc-shaped frame body 10 having a predetermined thickness is formed by the frame body 11 and the frame body 12 by fitting the connecting pins 13 to the first and second frames.
When connecting the frame 11 and the frame 12, the cutting blade 30, the pivot 40, and the connection 50 are also fixed at predetermined positions.

Further, in the present embodiment, as shown in FIGS. 2 to 4, each of the outer surface 11 d of the frame 11 and the outer surface 12 d of the frame 12 is connected to the rotation jig 70 shown in FIG. Engagement rails 11b and 12b that engage with the joint 72 are provided. The engagement rails 11b and 12b serve as engagement portions that engage with the engagement portions 72, and are formed of steel. In the present embodiment, the engagement rails 11b, 12b are semicircular protrusions having a predetermined width and extending from one end to the other end of the outer surfaces 11d, 12d of the frame bodies 11, 12, each having a semicircular shape. Is formed. Further, the curved shapes of the engagement rails 11b and 12b are configured to be the same as the respective curved shapes of the frame bodies 11 and 12. The engagement rails 11b, 12b are fixed to the outer surfaces 11d, 12d by welding.
Although not shown in detail in FIG. 7 (a), the engaging portion 72 of the rotating jig 70 has, at its tip end, a holding portion capable of holding the engaging rails 11b, 12b from inside and outside. The engaging rails 11b and 12b are held by the holding portion, and the pipe cutter 1 can be rotated by holding the holding portion 71 in this state.

  The second arc-shaped frame 20 is combined with the first arc-shaped frame 10 to form a skeleton of the pipe cutter 1. The second arc-shaped frame 20 includes a pair of frames 21 and 22 and a connecting pin 23 that connects the pair of frames 21 and 22. Note that the frames 21 and 22 and the connecting pin 23 are formed of steel.

As shown in FIG. 2B and FIG. 4, the second circle is formed by connecting the pair of semicircular steel frames 21 and 22 using the connecting pin 23 in a state where they are opposed to each other. An arc-shaped frame 20 is formed. Specifically, the frame 21 and the frame 22 are arranged to face each other, and a fitting recess 21 a provided on the inner surface 21 c of the frame 21 and a fitting recess (not shown) provided on the inner surface 22 c of the frame 22. The second arc-shaped frame 20 having a predetermined thickness is formed by the frame body 21 and the frame body 22 by fitting the connecting pins 23 to the first and second frames.
When the frame body 21 and the frame body 22 are connected, the pivot portion 40, the connection portion 50, and the contact roller 60 are also fixed at predetermined positions.

  Further, in the present embodiment, as shown in FIGS. 2 to 4, the outer surface 21 d of the frame 21 and the outer surface 22 d of the frame 22 are respectively connected to the rotation jig 70 shown in FIG. Engagement rails 21b and 22b for engaging with the joint 72 are provided. The engagement rails 21b and 22b are engagement portions that engage with the engagement portions 72, and are formed of steel. Further, in the present embodiment, the semicircular frames 21 and 22 are formed of semicircular projections having a predetermined width and extending from one end to the other end of the outer surfaces 21d and 22d. Further, the curved shapes of the engagement rails 21b and 22b are configured to be the same as the respective curved shapes of the frame bodies 21 and 22. The engagement rails 21b and 22b are fixed to the outer surfaces 21d and 22d by welding.

Further, the second arc-shaped frame body 20 is pivotally supported at one end side with the first arc-shaped frame body 10 via the pivotal attachment portion 40, and at the other end side via the connecting portion 50. It is connected to the body 10 so as to be freely connected, and is assembled in an annular shape when closed. In a state where the pipe 100 is assembled in a ring shape, the pipe 100 is rotatably attached to the outer periphery of the pipe 100 to cut the pipe 100.
In addition, the number and arrangement position of the connecting pins 13 and 23 are not limited to those of the present embodiment, and can be changed as appropriate.

The cutting blade section 30 includes a cutting blade 31 for cutting the pipe 100, and moves the cutting blade 31 to a desired position and fixes the cutting blade 31 at that position.
As shown in FIGS. 1 to 6, the cutting blade 30 includes a cutting blade 31, a cutting blade holder 32, and a moving and fixing mechanism 33. In the present embodiment, the cutting edge 30 is attached to the first arc-shaped frame 10. Of course, the configuration is not limited to such a configuration, and a configuration in which the cutting edge portion 30 is provided on the second arc-shaped frame 20 may be adopted. Further, the cutting edge portion 30 may be provided on both the first arc-shaped frame 10 and the second arc-shaped frame 20.

The cutting blade 31 is a blade for cutting the pipe 100, and is formed of thin circular steel in the present embodiment. In the center of the cutting blade 31, a through hole K1 is provided. The through hole K1 is for inserting a shaft 31a for rotatably fixing the cutting blade 31 to the cutting blade holder 32. In the present embodiment, the cutting blade 31 is rotatably fixed to the cutting blade holder 32 by passing the shaft 31a through the through hole K1.
Of course, the configuration of the cutting blade 31 is not limited to such a configuration, and can be changed as appropriate as long as it can be rotatably attached to the cutting blade holder 32.

The cutting blade holder 32 serves as a so-called base for mainly holding the cutting blade 31 rotatably. In addition, a pair of semicircular frame members 11 and 12 are rotatably mounted in the circumferential direction of the frame members 11 and 12, and are moved and fixed by the moving and fixing mechanism 33 to form an arc of the first arc-shaped frame member 10. This is for adjusting the amount of advance of the cutting blade 31 toward the center.
As shown in FIGS. 1 to 6, the cutting blade holder 32 includes a main body 32a, a support pin 32b, and a nut clamping piece 32c.

The main body 32 a forms a skeleton of the cutting blade holder 32. In the present embodiment, the main body 32a is formed of a substantially rectangular parallelepiped steel member. Specifically, as shown in FIGS. 3 to 5, a through-hole K <b> 2 penetrating in the short direction of the main body 32 a is provided at one longitudinal end of a steel member having a substantially rectangular parallelepiped shape. The support pins 32b are inserted through the through holes K2 to fit into the fitting recesses 11e provided in the frame 11 and the fitting recesses (not shown) provided in the frame 12. Thus, the main body 32a is rotatably mounted between the pair of frames 11, 12 with the support pin 32b as a fulcrum.
Further, in the present embodiment, as shown in FIG. 3, in a state in which the side surfaces S1 and S2 of the main body 32a are in close contact with the inner surfaces 11c and 12c of the frame bodies 11 and 12, the main body 32a is paired via the support pins 32b. Are rotatably mounted between the frame bodies 11 and 12. That is, the main body 32a is configured to rotate along the inner surfaces 11c and 12c.

As shown in FIGS. 3B, 4, and 5, a continuous notch is formed in the main body 32a from the end opposite to the side where the through hole K2 is provided to the position where the through hole K2 is provided. L1 and L2 are provided. The notch L1 is for forming a space for holding the nut 33a constituting the moving and fixing mechanism 33 and for forming a pair of nut holding pieces 32c for holding the nut 33a. As described above, in the present embodiment, the notch L1 is provided in the substantially rectangular parallelepiped steel member forming the main body 32a, so that the main body 32a and the nut holding piece 32c are integrally formed. Further, in this embodiment, a fitting recess G is provided on the inner surfaces of the pair of nut holding pieces 32c.
The notch L2 is for forming a space for rotatably fixing the cutting blade 31. In the notch L2, a fitting recess (not shown) is provided at a position facing the short side of the main body 32a, and the fitting recess is inserted into the through hole K1 of the cutting blade 31. The cutting blade 31 is rotatably fixed to the main body 32a by fitting the shaft 31a.
Further, as shown in FIG. 3B, in the present embodiment, the width P of the notch L1 is wider than the width Q of the notch L2.

  The moving and fixing mechanism 33 is capable of moving the cutting blade holder 32 to the center of the arc of the first arc-shaped frame body 10 so as to be able to move forward and backward, and is also capable of fixing the cutting blade holder at a desired position. As shown in FIGS. 3 to 6, the movement fixing mechanism 33 includes a nut 33a, a bolt 33b, a movement restricting portion 33c, and a shaft 33d.

  The nut 33a is a nut to which the bolt 33b is screwed while being held between the pair of nut holding pieces 32c of the cutting blade holder 32. By rotating the bolt 33b in the forward or negative direction, the bolt 33b is moved forward and backward in the longitudinal direction so that the cutting blade holder 32 can freely advance toward the center of the arc of the first arc-shaped frame 10. It is intended to be movable. Therefore, it constitutes a moving mechanism for moving the cutting blade holder 32 together with the bolt 33b. In the present embodiment, the configuration is such that a hexagonal nut is used.

  In the present embodiment, as shown in FIG. 4, a fitting recess H is provided on a side surface of the nut 33a facing the nut holding piece 32c. Then, the shaft 33d made of steel is fitted into the fitting recess H and the fitting recess G, so that the nut 33a can be turned on the pair of nut holding pieces 32c via the shaft 33d. It is attached with. Thus, the nut 33a is in a state in which the nut 33a can rotate in the circumferential direction of the first arc-shaped frame body 10.

  The shape and size of the nut 33a and the method of attaching the nut 33a to the nut holding piece 32c are not limited to those of the present embodiment, and the bolt 33b can be screwed together with the first arc-shaped frame. As long as the nut 10 can be attached to the nut holding piece 32c in a rotatable state in the circumferential direction, it can be appropriately changed. For example, without using the shaft 33d, the nut 33a may be held between the pair of nut holding pieces 32c by simply fitting the nut 33a into the notch L1. However, it is preferable that the nut 33a is rotatably attached to the nut holding piece 32c using the shaft 33d.

The bolt 33b is for rotating the nut 33a by rotating forward or negatively.
The shape, size, and the like of the bolt 33b are not limited to those in the present embodiment, and can be appropriately changed.

  The movement restricting portion 33c restricts the movement of the bolt 33b in the longitudinal direction. In the present embodiment, the movement restricting portion 33c includes a frame body F, a nut N1, and a nut N2.

The frame body F is for regulating the movement of the bolt 33b in the longitudinal direction in combination with the nuts N1 and N2. In the present embodiment, the frame body F is formed of a substantially cono-shaped flat plate member made of steel. As shown in FIGS. 1 to 3 in a simplified manner, welding is performed in a state where a frame body F formed of a substantially U-shaped flat plate member is arranged so as to span from the frame body 11 to the frame body 12. It is configured to be fixed to the frame bodies 11 and 12 by using them.
In the present embodiment, as shown in FIG. 3, the size of the frame body F is set to a size that does not protrude from the width of the first arc-shaped frame body 10.

At a substantially central position of the frame body F, a circular through-hole K3 for inserting the bolt 33b is provided. In the present embodiment, the diameter of the through-hole K3 is slightly larger than the diameter of the shaft of the bolt 33b. With such a configuration, the shaft of the bolt 33b is movable in the circumferential direction of the arc-shaped frame 10 in the through hole K3. That is, the configuration is such that the shaft of the bolt 33b is inserted into the through hole K3 with some play. Here, "slightly larger" means that the diameter of the through hole K3 is about several mm larger than the diameter of the shaft of the bolt 33b.
Of course, the shape and size of the frame body F are not limited to those of the present embodiment, and can be changed as appropriate. However, it is preferable that the size of the frame body F is not larger than the width of the first arc-shaped frame body 10.

  The nuts N1 and N2 are adapted to restrict the movement of the bolt 33b in the longitudinal direction when combined with the frame body F. Although not shown in detail in the present embodiment, the nut N1 is screwed into the bolt 33b on the lower side with the frame body F formed of a substantially U-shaped flat plate member therebetween, and the nut on the upper side. N2 is screwed to the bolt 33b. That is, the frame body F is sandwiched between the nut N1 and the nut N2. In the present embodiment, after the nuts N1 and N2 are screwed into predetermined positions of the bolt 33b, the nuts N1 and N2 are fixed to the bolt 33b using welding.

  With the above configuration, the nut 33a can be moved forward and backward in the longitudinal direction of the bolt 33b by the forward rotation or the negative rotation of the bolt 33b, but by the frame body F and the nuts N1 and N2, The bolt 33b itself can be reliably prevented from moving in the longitudinal direction. In other words, the movement of the bolt 33b in the longitudinal direction can be reliably suppressed by the movement restricting portion 33c. Thus, by simply moving the cutting blade holder 32 to a desired position with the bolt 33b and the nut 33a, the cutting blade holder 32 can be firmly fixed at that position.

The pivot portion 40 is for pivotally connecting one end side of the first arc-shaped frame 10 and the second arc-shaped frame 20.
In the present embodiment, as shown in FIG. 4, the pivot portion 40 includes a main body 41 and a support pin 42.

The main body 41 forms a skeleton of the pivot portion 40.
In the present embodiment, as shown in FIGS. 2 to 4, the main body 41 is formed of a rectangular parallelepiped member formed of steel. As shown in FIG. 4, a through hole K4 is provided at one end in the longitudinal direction of the main body 41, and a support pin 42 is inserted through the through hole K4 to be provided on the inner surface 21 c of the frame 21. The support pin 42 is fitted into the fitting recess 21a and a fitting recess (not shown) provided on the inner surface 22c of the frame 22, and the frame 41 is rotatable about the support pin 42 as a fulcrum. 21 and 22 are attached. That is, in the present embodiment, the shape and size of the support pin 42 are the same as the shape and size of the connecting pin 23.
At the end opposite to the through hole K4, the main body 41 is fixed to the frames 11, 12 by welding with the main body 41 sandwiched between the frames 11 and 12. With such a configuration, with the main body 41 sandwiched between the frame 11 and the frame 12 and the frame 21 and the frame 22, the first arc-shaped frame 10 and the second arc-shaped One end side with the frame body 20 is pivotally connected.
The configuration of the pivoting portion 40 is not limited to that of the present embodiment, and any configuration may be employed in which one end of the first arcuate frame 10 and the second arcuate frame 20 can be pivotally attached. It can be changed as appropriate.

The connecting portion 50 is configured to be capable of releasing the other end of the first arc-shaped frame 10 and the second arc-shaped frame 20 (an end opposite to the side on which the pivot portion 40 is provided). It is for connection.
In the present embodiment, the connecting portion 50 includes a connecting tool 51, a connecting tool receiving section 52, and a support pin 53.

The connecting tool 51 is rotatably mounted between a pair of frames 21 and 22 constituting the second arc-shaped frame 20, so that the first arc-shaped frame 10 and the second arc-shaped frame are connected to each other. It is for opening and closing with the body 20.
In the present embodiment, as shown in FIG. 4, the connecting tool 51 includes a main body 51a, a neck 51b, and a gripping head 51c.

  The main body 51a forms a skeleton of the connecting tool 51. In the present embodiment, the main body 51a is formed of a rectangular parallelepiped member formed of steel. Further, a through-hole K5 is provided on one end side in the longitudinal direction of the main body 51a. The support pins 53 are inserted through the through holes K5, and the support pins 53 are fitted into the fitting recesses 21a provided in the frame 21 and the fitting recesses (not shown) provided in the frame 22. The main body 51a is rotatably mounted between the frame 21 and the frame 22. That is, in the present embodiment, the shape and size of the support pin 53 are the same as the shape and size of the connecting pin 23.

  The neck part 51b constitutes a fitting part with the connector receiving part 52. In this embodiment, as shown in FIGS. 2 and 4, a columnar member made of steel is used as the neck portion 51b, and the surface of the neck portion 51b is subjected to thread cutting.

  The gripping head 51c serves as a gripping portion of the connecting tool 51. Also, the length of the neck portion 51b can be adjusted. In this embodiment, as shown in FIGS. 2 to 4, an elongated nut having a hexagonal outer shape is used as the gripping head 51 c. That is, the gripping head 51c can be screwed into the neck 51b, and the length of the neck 51b can be varied by rotating the gripping head 51c forward or negative.

  Further, in the present embodiment, as shown in FIGS. 1 and 3A, in a state where the neck portion 51b is fitted to the connecting member receiving portion 52, the neck portion 51b is connected to the first arc-shaped frame 10 and The second arc-shaped frame 20 can be fastened in the tangential direction. With such a configuration, the coupling tool 51 and the coupling tool receiving part 52 are connected to each other, and the neck part 51b is simply tightened, and the tightening force of the neck part 51b is increased by the first arc-shaped frame body 10 and the second arc frame. Acting in the tangential direction of the arc-shaped frame 20, the gap between the end of the first arc-shaped frame 10 and the end of the second arc-shaped frame 20 generated near the connecting portion 50 can be effectively removed. By contracting, the first arc-shaped frame 10 and the second arc-shaped frame 20 can be connected without displacement.

The connection tool receiving portion 52 is connected to the connection tool 51 to form a closed state between the first arc-shaped frame 10 and the second arc-shaped frame 20, as shown in FIG. By releasing the connection with the connecting tool 51, the closed state of the first arc-shaped frame 10 and the second arc-shaped frame 20 can be released as shown in FIG.
In this embodiment, as shown in FIGS. 2B and 4, the first arc-shaped frame 10 is provided with the connector receiving portion 52.

Specifically, a substantially rectangular connector receiving portion 52 made of steel is arranged between the frame 11 and the frame 12, and the connector receiving portion 52 is connected to the frame 11 and the frame 12 by welding. The configuration is such that the portion 52 is fixed. Further, a U-shaped notch 52a for connecting the connecting tool 51 and the connecting tool receiving section 52 by fitting the neck portion 51b is provided in the connecting tool receiving section 52.
In this embodiment, as shown in FIGS. 2B and 3 in a simplified manner, the length (width) of the connecting member receiving portion 52 in the short direction and the short direction of the main body 51a of the connecting member 51 are shown. , The width (width) of the body 32a of the cutting blade holder 32 in the width direction, and the length (width) of the body 41 of the pivot portion 40 in the width direction are all the same length. There is a configuration to be.
Note that the configuration of the connecting portion 50 is not limited to that of the present embodiment, and the other end of the first arc-shaped frame 10 and the second arc-shaped frame 20 (the pivot portion 40 is provided). The end opposite to the side can be appropriately changed as long as the end can be connected so that the connection can be released.

The contact roller 60 is for assisting good cutting of the pipe 100. The contact roller 60 includes a roller 61 formed of a columnar member having a through hole in the center, and a support pin 62 formed of a columnar member that rotatably supports the roller 61.
In this embodiment, as shown in FIGS. 2 and 4, the contact roller 60 is arranged at a predetermined position of the second arc-shaped frame 20. Specifically, in a state in which the two rollers 61 are inserted through one support pin 62, the support pin is supported by the fitting recess 21 e of the frame 21 and the fitting recess (not shown) of the frame 22. A pair of rollers 61 are attached (fixed) to the second arc-shaped frame 20 by fitting the pins 62 for use. In the present embodiment, a pair of rollers 61 are arranged at two places of the arc-shaped frame 20.
In this embodiment, both the roller 61 and the support pin 62 are formed of steel.
The configuration (number, size, arrangement position, and the like) of the contact rollers 60 is not limited to that of the present embodiment, and can be changed as appropriate.

  Next, a method for cutting the pipe 100 using the pipe cutter 1 according to the embodiment of the present invention having such a configuration will be described.

First, as shown in FIG. 2, in a state where the connection between the connecting tool 51 and the connecting tool receiving portion 52 is released (a state in which the first arc-shaped frame 10 and the second arc-shaped frame 20 are opened). The pipe cutter 1 is arranged on the outer periphery of the pipe 100.
Then, the connecting tool 51 and the connecting tool receiving portion 52 are connected, and the first arc-shaped frame 10 and the second arc-shaped frame 20 are closed. Specifically, the neck 51b is fitted into the notch 52a. In this state, the gripping head 51c is screwed in until the gripping head 51c comes into contact with the connector receiving portion 52 and the rotation stops. Thereby, the gap between the end of the first arc-shaped frame 10 near the connecting portion 50 and the end of the second arc-shaped frame 20 is reduced, and the first arc-shaped frame 10 is The second arc-shaped frame 20 is connected without displacement.

  Next, the amount of advance of the cutting blade 31 in the direction of the center of the arc of the first arc-shaped frame 10 is adjusted using the moving and fixing mechanism 33. Specifically, referring to FIG. 6A, the bolt 33b is negatively rotated. Then, as shown in FIG. 6B, the nut 33a screwed to the bolt 33b is pushed inward in the radial direction of the first arc-shaped frame body 10. As a result, the nut holding piece 32c holding the nut 33a is also pushed radially inward of the first arc-shaped frame 10, and the cutting blade 31 fixed to the main body 32a is moved to the first arc-shaped frame. 10 is pushed inward in the radial direction.

More specifically, as shown in FIG. 6, when the bolt 33b is rotated in the negative direction, the nut 33a screwed to the bolt 33b is pushed inward in the radial direction of the first arc-shaped frame 10. As a result, the nut holding piece 32c (main body 32a) holding the nut 33a moves in the direction of the center of the arc of the first arc-shaped frame body 10 along the rotation locus R of the main body 32a with the support pin 32b as a fulcrum. It is pushed inward.
In FIG. 6, black arrows indicate the moving direction of the main body 32a along the rotation locus R, and white arrows indicate the moving directions of the nut 33a.
In FIG. 6B, for convenience of explanation, the nut 33a, the nut N1, the nut N2, and the bolt 33b are illustrated in a state where they are inclined more than usual.

At this time, the nut 33a is attached to the pair of nut holding pieces 32c so as to be rotatable in the circumferential direction of the first arc-shaped frame body 10 via the shaft 33d. The posture angle C of the nut 33a can automatically and effectively follow the posture angle D of the main body 32a. That is, the nut 33a can be inclined as if the upper left end portion of the upper surface was pressed down. Further, in the present embodiment, the diameter of the through hole K3 is slightly larger than the diameter of the shaft of the bolt 33b, so that the inclination angle E of the bolt 33b with respect to the nut 33a is also appropriate according to the change in the attitude angle of the nut 33a. It can be adjusted to an appropriate inclination angle. Specifically, as shown in FIG. 6B, the bolt 33b can be inclined as if the left end of the upper surface of the head is pressed down.
As described above, in the present embodiment, the nut 33a is attached to the pair of nut holding pieces 32c while being rotatable in the circumferential direction of the first arc-shaped frame 10, and the through-hole K3 through which the bolt 33b is inserted is formed. By making the diameter slightly larger than the diameter of the shaft of the bolt 33b, the nut 33a and the bolt 33b can be automatically moved to an appropriate position in accordance with the movement of the main body 32a.

  Here, the "posture angle C of the nut 33a" means an angle formed by a horizontal line passing through the center of the support pin 32b and a tangent to the upper surface or the lower surface of the nut 33a. The "posture angle D of the main body 32a" means an angle formed by a horizontal line passing through the center of the support pin 32b and a tangent to the upper surface or the lower surface of the main body 32a. Further, “the inclination angle E of the bolt 33b with respect to the nut 33a” means an angle formed between a tangent of the upper surface or the lower surface of the nut 33a and the axis of the bolt 33b. The closer the angle of inclination E of the bolt 33b with respect to the nut 33a is to 90 degrees, the more properly the nut 33a and the shaft of the bolt 33b can be screwed together. Thus, the nut 33a can be smoothly moved with respect to the shaft of the bolt 33b, and the amount of movement of the nut 33a on the shaft of the bolt 33b can be increased. Therefore, “appropriate inclination angle” means that the closer to 90 degrees, the more appropriate the angle.

  When the main body 32a is pushed inward in the direction of the center of the arc of the first arc-shaped frame body 10 in this manner, the cutting blade 31 fixed to the main body 32a moves radially inward of the first arc-shaped frame body 10. It is pushed into. That is, the amount of advance of the cutting blade 31 toward the inside of the first arc-shaped frame body 10 in the direction of the arc center increases. The above operation is repeated until the cutting blade 31 contacts the pipe 100.

Then, after the cutting blade 31 abuts on the pipe 100, the pipe cutter 1 is rotated while grasping the connecting pins 13, 23 and the engaging rails 11b, 12b, 21b, 22b by hand. Alternatively, the pipe cutter 1 is rotated using the rotation jig 70 shown in FIG.
As a result, the pipe cutter 1 rotates around the pipe 100 via the contact roller 60, and the pipe 100 is cut by the cutting blade 31. In addition, depending on the thickness of the pipe 100, the moving and fixing mechanism 33 is used again to adjust the amount of advance of the cutting blade 31 in the direction of the center of the arc of the first arc-shaped frame 10 while rotating the pipe cutter 1. And the pipe 100 is cut.

After the cutting of the pipe 100 is completed, the gripping head 51c is negatively rotated, and the engagement between the neck portion 51b and the notch 52a is released while the gripping head 51c is gripped.
The pipe cutter 1 is removed from the pipe 100 by opening the first arc-shaped frame 10 and the second arc-shaped frame 20 in this state.
Thus, the cutting of the pipe 100 by the pipe cutter 1 is completed.

  The pipe cutter 1 according to the embodiment of the present invention having such a configuration has the following effects.

  The movement amount of the cutting blade 31 is provided by including the movable fixing mechanism 33 that can move the cutting blade holder 32 toward the center of the arc of the first arc-shaped frame 10 so as to be able to move forward and backward and can fix the cutting blade holder 32 at a desired position. Can be appropriately adjusted to a desired amount. Therefore, the pipe cutter 1 with good work efficiency and good operability can be obtained.

  The moving and fixing mechanism 33 includes a nut 33a sandwiched between the cutting blade holders 32, a bolt 33b screwed to the nut 33a, and a movement restricting portion 33c for restricting movement of the bolt 33b in the longitudinal direction. By rotating the bolt 33b in the forward direction or the negative direction, the nut 33a can be moved forward and backward in the longitudinal direction of the bolt 33b. In this configuration, the cutting blade holder 32 can be fixed at a desired position by the movement restricting portion 33c, and the first arc-shaped portion can be formed only by rotating the bolt 33b. The amount of advance of the cutting blade 31 in the direction of the center of the circular arc of the frame body 10 can be appropriately adjusted, so that the pipe cutter 1 with higher working efficiency and better operability can be obtained. .

Further, the nut 33a is attached to the pair of nut holding pieces 32c in a state where the nut 33a is rotatable in the circumferential direction of the first arc-shaped frame body 10 via the shaft 33d, and the diameter of the through hole K3 of the frame body F is increased by the bolt 33b. Is slightly larger than the diameter of the shaft, the posture angle C of the nut 33a can automatically and effectively follow the posture angle D of the main body 32a, and can be adjusted according to the change in the posture angle of the nut 33a. Thus, the inclination angle E of the bolt 33b with respect to the nut 33a can be adjusted to an appropriate inclination angle.
With such a configuration, the screw 33b and the bolt 33b are not sufficiently screwed with each other because the inclination angle of the bolt 33b with respect to the nut 33a is not an appropriate angle, and the movement of the nut 33a on the axis of the bolt 33b is stopped. Can be effectively prevented. Therefore, the movement range of the nut 33a on the axis of the bolt 33b (in the longitudinal direction) can be effectively widened. Further, the amount of advance of the cutting blade 31 inward of the first arc-shaped frame body 10 toward the center of the arc can be effectively increased, and the amount of advance of the cutting blade 31 can be further adjusted to a desired amount. It can be. Therefore, the pipe cutter 1 with higher work efficiency and operability can be obtained.

  In addition, since the rotation jig 70 can be used to rotate the pipe cutter 1, the pipe cutter 1 can simultaneously improve the work efficiency and reduce the work load on the operator.

  Further, the length (width) of the connecting tool receiving portion 52 in the short direction, the length (width) of the main body 51a of the connecting tool 51 in the short direction, and the length of the main body 32a of the cutting blade holder 32 in the short direction. The length (width) and the length (width) of the main body 41 of the pivot portion 40 in the short direction are all the same length, and the connecting pins 13 and 23, the cutting blade 30, the pivot portion 40, and the connection The part 50 and the contact roller 60 are all disposed between the pair of frames 11 and 12 and the pair of frames 21 and 22 that constitute the first and second arc-shaped frames 10 and 20. As shown in FIG. 3 (a), it is possible to adopt a configuration in which no members protrude beyond the width T of the pipe cutter 1. Therefore, the pipe cutter 1 can be reduced in size.

  In a state where the side surfaces S1 and S2 of the main body 32a of the cutting blade holder 32 are in close contact with the inner surfaces 11c and 12c of the frame bodies 11 and 12, the main body 32a is held between the pair of frame bodies 11 and 12 via the support pins 32b. , The main body 32a can be sandwiched between the frame bodies 11 and 12. Therefore, the movement of the bolt 33b in the longitudinal direction can be more effectively restricted. At the same time, it is possible to reliably prevent the main body 32a from being shaken in the thickness direction (the direction of the width T) of the pipe cutter 1, so that the pipe cutter 1 with higher cutting accuracy can be obtained.

In the embodiment of the present invention, the contact roller 60 is fixed at a predetermined position of the second arc-shaped frame 20. However, the present invention is not necessarily limited to such a configuration.
For example, as the configuration of the contact roller 60, a configuration may be used in which a mechanism is provided that can move forward and backward in the direction of the center of the arc of the second arc-shaped frame 20 using a spring or the like. With such a configuration, the pipe cutter 1 can easily follow the outer peripheral surface of the pipe 100 even when the outer peripheral surface of the pipe 100 has irregularities. Therefore, the pipe cutter 1 with higher cutting accuracy can be obtained.

As shown in FIG. 7 (b), the first and second arc-shaped frames 10 and 20 receive the rotational force of a rotary drive (not shown) to rotate the pipe cutter 1 so that the pipe cutter 1 can rotate. It is good also as a structure provided with the feed guide chain 80 as a. The feed guide chain 80 is a commonly used one and can be fixed to the outer periphery of the first and second arc-shaped frames 10 and 20 by welding. With such a configuration, the pipe cutter 1 can be automatically rotated. Therefore, the work load on the worker can be significantly reduced, and the pipe cutter 1 with higher working efficiency and operability can be obtained.
The feed guide chain 80 may be configured to be attached to the outside of the first and second arc-shaped frames 10 and 20 as shown in FIG. 7B, or the first and second arc-shaped frames. It is good also as a structure attached inside 10,20. As a configuration attached to the inside, for example, a through-hole is provided in the thickness direction (direction of width T) of the first and second arc-shaped frames 10 and 20, and a support pin inserted through the feed guide chain 80 is inserted into the through-hole. , And can be fixed by caulking in that state. With such a configuration, there is no need to perform a welding operation for attaching the feed guide chain to the first and second arc-shaped frames 10 and 20, so that the manufacturing process can be simplified and the feed guide chain 80 Can be effectively prevented from falling off, and a pipe cutter with higher working efficiency can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, since the cutting | disconnection operation | work of the pipe to be cut can be performed efficiently, industrial utility in the field of a pipe cutter is high.

Reference Signs List 1 pipe cutter 10 first arc-shaped frame 11 frame 11a fitting recess 11b engaging rail 11c inner surface 11d outer surface 11e fitting recess 12 frame 12b engaging rail 12c inner surface 12d outer surface 13 connecting pin 20 second Frame 21 21 frame 21a fitting recess 21b engaging rail 21c inner surface 21d outer surface 21e fitting recess 22 frame 22b engaging rail 22c inner surface 22d outer surface 23 connecting pin 30 cutting blade 31 cutting blade 31a shaft 32 Cutting Blade Holder 32a Main Body 32b Support Pin 32c Nut Nipping Piece 33 Movement and Fixing Mechanism 33a Nut 33b Bolt 33c Movement Restriction Section 33d Shaft 40 Pivot 41 Main Body 42 Support Pin 50 Connection 51 Connection 51a Main Body 51b Neck Part 51c Head for gripping 52 Connector receiving part 52a Notch 53 Supporting Pin 60 Contact Roller 61 Roller 62 Supporting Pin 70 Rotating Jig 71 Gripping Part 72 Engaging Part 80 Feed Guide Chain 100 Pipe C Posture Angle D Posture Angle E Inclination Angle F Frame Body G Fitting Depression H Fitting recess K1 Through hole K2 Through hole K3 Through hole K4 Through hole K5 Through hole L1 Notch L2 Notch N1 Nut N2 Nut P Width Q Width R Rotation Track S1 Side S2 Side T Width

In order to achieve the above object, a pipe cutter of the present invention is rotatably mounted on an outer periphery of a pipe to be cut, and cuts the pipe to be cut from an outer diameter side thereof by a cutting blade abutting on an outer peripheral surface of the pipe to be cut. a pipe cutter was first, a second arcuate frame member, said first arcuate frame and front Stories second arcuate made by opposed frame member of the pair of semicircular A cutting blade portion having a cutting blade attached to at least one of the arc-shaped frame bodies and one end side of the first arc-shaped frame body and the second arc-shaped frame body; a pivot portion, said a first arcuate frame and the connecting portion connecting releasably connecting the other end of said second arcuate frame, the first arc-shaped frame and before Symbol first And the outer peripheral surface of the pipe to be cut attached to at least one of the two arc-shaped frames and Contact and a contact roller,
The cutting blade section includes a cutting blade, a cutting blade holder that rotatably holds the cutting blade and is rotatably mounted between the pair of semicircular frame bodies, and a cutting blade holder. Rutotomoni and a moving securing mechanism which can be fixed at a desired position one 且movable freely back and forth to the arc center of the arc frame,
A main body rotatably mounted between the pair of semicircular frames in a state in which the cutting blade holder is in contact with each inner surface of the pair of semicircular frames arranged to face each other; A pair of holding pieces arranged to face each other via a notch provided in a part of the main body,
The movement fixing mechanism includes a nut held between the pair of holding pieces in the notch, a bolt screwed to the nut, and a movement restricting portion that restricts movement of the bolt in the longitudinal direction, In addition, the movement restricting portion is provided on a pair of semicircular frames in a state where the movement restricting portions are arranged so as to extend from one frame to the other frame on a radially outer side of the pair of semicircular frames. A frame body that is fixed and has a through hole through which the bolt is inserted, and is fixed to the bolt in a state of being screwed to the bolt at a position sandwiching the frame body between the upper side and the lower side of the through hole. And a diameter of the through hole is slightly larger than a diameter of a bolt shaft,
The pair of clamping pieces have a fitting recess on each inner surface, and the nut has a fitting recess on an outer surface facing the inner surface of the pair of clamping pieces, and the nut for fitting the pair of clamping pieces. The nut is clamped by a pair of clamping pieces in a state where the shaft is fitted in the recess and the fitting recess of the nut,
By rotating the bolt forward or negative, the nut is moved forward and backward in the longitudinal direction of the bolt, thereby enabling the cutting blade holder to be movable forward and backward in the direction of the arc center of the arc-shaped frame, And while enabling the nut to rotate in the circumferential direction of the pair of arc-shaped frames independent of the main body, the tilt angle of the bolt with respect to the nut can be adjusted through the rotation of the nut,
The movement restricting portion can fix the cutting blade holder at a desired position, and the movement fixing mechanism can adjust the amount of advance of the cutting blade toward the center of the arc of the arc-shaped frame. This is one of the features.
The pipe cutter of the present invention, in addition to the first feature, the contact roller is in that it comprises a retractable and retractable mechanism to the arc center of the arc-shaped frame to the second feature.
Further, in addition to the first or second feature, the pipe cutter according to the present invention further includes an engaging portion that engages with a first and second arc-shaped frame bodies with a rotating jig for rotating the pipe cutter. Is a third feature.
Further, the pipe cutter of the present invention can rotate the pipe cutter by receiving the rotating force of the rotary driving machine on the first and second arc-shaped frames in addition to any one of the above-described first to third features. The fourth feature is that a rotational force passive member is provided.

According to the pipe cutter according to the first aspect, the pipe to be cut is rotatably mounted on the outer circumference of the pipe to be cut, and the pipe to be cut is cut from the outer diameter side by a cutting blade that comes into contact with the outer peripheral surface of the pipe to be cut. a pipe cutter, first, and second arcuate frame member, said first arcuate frame and front Stories second arcuate frame body formed by opposed frame member of the pair of semicircular A cutting edge portion having a cutting blade attached to at least one of the arc-shaped frames; and a pivotal connection for pivotally connecting one end side of the first arc-shaped frame and the second arc-shaped frame. parts and said a first connecting portion connecting releasably connecting the other end of the arc-shaped frame and said second arcuate frame, the first arc-shaped frame and front Stories second Attached to at least one of the arc-shaped frame members and the outer peripheral surface of the pipe to be cut And a contact roller,
The cutting blade section includes a cutting blade, a cutting blade holder that rotatably holds the cutting blade and is rotatably mounted between the pair of semicircular frame bodies, and a cutting blade holder. Rutotomoni and a moving securing mechanism which can be fixed at a desired position one 且movable freely back and forth to the arc center of the arc frame,
A main body rotatably mounted between the pair of semicircular frames in a state in which the cutting blade holder is in contact with each inner surface of the pair of semicircular frames arranged to face each other; A pair of holding pieces arranged to face each other via a notch provided in a part of the main body,
The movement fixing mechanism includes a nut held between the pair of holding pieces in the notch, a bolt screwed to the nut, and a movement restricting portion that restricts movement of the bolt in the longitudinal direction, In addition, the movement restricting portion is provided on a pair of semicircular frames in a state where the movement restricting portions are arranged so as to extend from one frame to the other frame on a radially outer side of the pair of semicircular frames. A frame body that is fixed and has a through hole through which the bolt is inserted, and is fixed to the bolt in a state of being screwed to the bolt at a position sandwiching the frame body between the upper side and the lower side of the through hole. And a diameter of the through hole is slightly larger than a diameter of a bolt shaft,
The pair of clamping pieces have a fitting recess on each inner surface, and the nut has a fitting recess on an outer surface facing the inner surface of the pair of clamping pieces, and the nut for fitting the pair of clamping pieces. The nut is clamped by a pair of clamping pieces in a state where the shaft is fitted in the recess and the fitting recess of the nut,
The nut is moved forward and backward in the longitudinal direction of the bolt by positively or negatively rotating the bolt, thereby enabling the cutting blade holder to be movable forward and backward in the direction of the arc center of the arc-shaped frame, And while enabling the nut to rotate in the circumferential direction of the pair of arc-shaped frames independent of the main body, the tilt angle of the bolt with respect to the nut can be adjusted through the rotation of the nut,
In addition, the cutting blade holder can be fixed at a desired position by the movement restricting portion, and the amount of advance of the cutting blade toward the center of the arc of the arc-shaped frame can be adjusted by the movement fixing mechanism.
By providing the moving and fixing mechanism, it is possible to provide a pipe cutter capable of appropriately adjusting the amount of advance of the cutting blade to a desired amount. Also, it can be easily attached to and detached from the outer periphery of the pipe to be cut via the connecting portion. Therefore, a pipe cutter having good work efficiency and good operability can be obtained.

Also moving the fixing mechanism consists of a nut which is held between the cutting blade holder, and a bolt screwed into the nut, and the movement restricting portion for restricting the movement in the longitudinal direction of the bolt, the forward rotation of the bolt Alternatively, by rotating the nut in a negative direction, the nut can be moved forward and backward in the longitudinal direction of the bolt, whereby the cutting blade holder can be moved forward and backward in the direction of the center of the arc of the arc-shaped frame, and the movement restriction can be performed. By the part, it is possible to fix the cutting blade holder at a desired position,
The amount of advance of the cutting blade in the direction of the center of the arc of the arc-shaped frame can be appropriately adjusted only by the rotation operation of the bolt, so that a pipe cutter with higher working efficiency and better operability can be obtained.

Also nuts, since it is held in an arc-shaped frame body in the circumferential direction in the cutting blade holder in a rotatable state,
When the cutting blade holder rotates toward the center of the circular arc of the arc-shaped frame, the posture angle of the nut can effectively follow the posture angle of the cutting blade holder. Accordingly, the inclination angle of the bolt with respect to the nut can be adjusted to an appropriate angle, and the moving range of the nut in the longitudinal direction of the bolt can be effectively widened. Therefore, the amount of advance of the cutting blade can be effectively increased, and a pipe cutter capable of further adjusting the amount of advance of the cutting blade to a desired amount can be obtained. Therefore, it is possible to obtain a pipe cutter with higher working efficiency and better operability.

According to the pipe cutter according to the second feature, in addition to the operation and effect according to the first feature, since the contact roller has a mechanism that can move forward and backward in the direction of the center of the arc of the arc-shaped frame,
The pipe cutter can easily follow the outer peripheral surface of the pipe to be cut even when the outer peripheral surface of the pipe to be cut has irregularities. Therefore, a pipe cutter with higher cutting accuracy can be obtained.

According to the pipe cutter according to the third aspect, in addition to the operation and effect according to the first or second aspect, a rotation jig for rotating the pipe cutter is provided on the first and second arc-shaped frames. Since it has an engaging portion that engages with the tool,
When rotating the pipe cutter, a rotating jig can be used, and a pipe cutter capable of simultaneously improving work efficiency and reducing work load can be provided.

According to the pipe cutter according to the fourth aspect, in addition to the operation and effect according to any one of the first to third aspects, the rotational force of the rotary driving machine is added to the first and second arc-shaped frames. Since it has a rotational force passive member that can rotate the pipe cutter in response to
The pipe cutter can be rotated by using the rotary driving device, so that the pipe cutter can be further improved in work efficiency and work load can be reduced.

Claims (6)

  A pipe cutter rotatably mounted on the outer periphery of the pipe to be cut, and configured to cut the pipe to be cut from the outer diameter side thereof by a cutting blade abutting on the outer peripheral surface of the pipe to be cut, and a pair of semi-circular shapes. First and second arc-shaped frames each having a frame disposed opposite to each other, and at least one of the first arc-shaped frame and the second arc-shaped frame. A cutting blade portion having a cutting blade to be attached, a pivot portion for pivotally connecting one end of the first arc-shaped frame member and the second arc-shaped frame member, and the first arc-shaped frame member. A connecting portion for releasably connecting the other end of the second arc-shaped frame, and a circle of at least one of the first arc-shaped frame and the second arc-shaped frame; A contact roller attached to the arc-shaped frame body and abutting against the outer peripheral surface of the pipe to be cut, wherein the cutting blade portion is A cutting blade holder that rotatably holds the cutting blade and that is rotatably mounted between the pair of semicircular frame members, and moves the cutting blade holder member toward the center of the arc of the arc-shaped frame member. And a movable fixing mechanism capable of moving forward and backward, and capable of being fixed at a desired position, wherein the moving amount of the cutting blade in the direction of the center of the arc of the arc-shaped frame can be adjusted by the moving and fixing mechanism. Characterized pipe cutter.   The moving and fixing mechanism includes a nut sandwiched between the cutting blade holders, a bolt screwed to the nut, and a movement restricting portion that restricts the movement of the bolt in the longitudinal direction. By moving the nut forward and backward in the longitudinal direction of the bolt, the cutting blade holder can be moved forward and backward in the direction of the center of the circular arc of the arc-shaped frame, and the movement restricting portion allows The pipe cutter according to claim 1, wherein the cutting blade holder can be fixed at a desired position.   3. The pipe cutter according to claim 2, wherein the nut is held by the cutting blade holder so as to be rotatable in a circumferential direction of the arc-shaped frame. 4.   The pipe cutter according to any one of claims 1 to 3, wherein the contact roller includes a mechanism that can move forward and backward in the direction of the center of the arc of the arc-shaped frame.   The first and second arc-shaped frame bodies are provided with an engagement portion that engages with a rotation jig for rotating the pipe cutter. The method according to any one of claims 1 to 4, wherein Pipe cutter.   The first and second arc-shaped frames are provided with a rotational force passive member that receives a rotational force of a rotary driving device and enables the pipe cutter to rotate. The described pipe cutter.

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