JP5283039B2 - Cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool with a constitution capable of improving workability in fixing to and removing from an internal surface of a pipe and preventing poor rotation of a rotary shaft by swarf. <P>SOLUTION: The cutting tool includes: a tube axis 5 having a feed rotary shaft 8 of an edge supporting frame 10 with a CT inserted inside; a rotating operation member 7 comprising a nut member axially movable by engaging with a threaded part 5A formed on a falling part on an outer peripheral surface of the tube axis 5; an X-shaped link member 2 having respective extending ends attached to a sliding link support member 4A pushed to move by the rotating operation member and a fixed link support member 4B opposite thereto; a coil spring 6 provided between the pair of link support members for applying force to push back the sliding link support member 4A; and a fixed leg piece 3 attached to the other extending end of the X-shaped link member and capable of pushing the internal surface of the tube. The fixed leg piece 3 is equipped with a swarf receive 3C formed of a recess between a pair of end plates 3B butting with the end surface of the tube and capable of gathering the swarf. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cutting tool, and more particularly to a cutting tool for an outer peripheral surface of a polyethylene pipe.

  Conventionally, a synthetic resin pipe such as polyethylene is sometimes used instead of a cast iron pipe or a steel pipe for a gas pipe laid under a road. This is because corrosion is prevented due to deterioration over time and external force generated at the time of disasters such as earthquakes is allowed to some extent to make it difficult to damage.

When a polyethylene pipe is used, there is a method of using a joint by electrofusion as a method of providing a branching portion in a part of the polyethylene pipe or performing addition (for example, Patent Document 1).
In this construction method, if the joint joint position on the surface of the polyethylene pipe is fouled, defective heat fusion may occur. Therefore, prior to heat fusion, it is necessary to remove fouling substances and the like by scraping the outer peripheral surface of the tube.

A scraper for polyethylene pipes is known as one of apparatuses for scraping the outer peripheral surface of the pipe (for example, Patent Document 2).
In the above-mentioned patent document, a rotating blade provided on the scraper is applied to the outer peripheral surface of the scraper while rotating the scraper on the outer peripheral surface of the pipe while the scraper is fixed by a chain or the like wound around the outer peripheral surface of the pipe. A scraping configuration is disclosed.

Since the scraper disclosed in the above-mentioned patent document is circulated by an operator, the operator needs labor to push and move the scraper during the cutting operation, and there is a possibility that the labor burden becomes large.
In addition, when a scraper is installed on the outer peripheral surface of the pipe, the cutting work will be performed even if the pipe is deformed and the outer diameter changes in the circumferential direction. There is also a risk that it will not be made into a product.

Therefore, a configuration of a scraper body that includes a plurality of fixed leg portions extending in the radial direction on the inner peripheral surface of the pipe in the circumferential direction of the pipe has been proposed (for example, Patent Document 3).
The above-mentioned patent document discloses a configuration in which the cutting blade is rotated in the circumferential direction in a state where the deformation in the circumferential direction of the tube is eliminated by extending the fixed leg portion in the radial direction and pressing it against the inner surface of the tube. .

JP 11-344191 A JP 2003-42343 A JP 2007-268628 A

Here, the configuration disclosed in Patent Document 3 is shown in FIG. 7, and the case of cutting the outer peripheral surface of the tube by this configuration will be described as follows.
First, the configuration of the scraper disclosed in Patent Document 3 will be described. In FIG. 7, the scraper 100 includes a nut member 103 that meshes with a screw portion 102 </ b> A formed on a rotating shaft 102 that constitutes a feed portion of the cutting blade 101. The base portion meshes with the screw portions 103A and 103B having lead directions opposite to each other along the axial direction of the nut member 103, and the diameter is increased by moving back and forth on the screw portion according to the rotation direction of the nut member 103. A link member 104 that is displaced in the diameter-reducing direction, and a leg contact plate 105 that is provided at the distal end of the link member 104 and can contact the inner surface of the pipe. The link member 104 is provided at equal positions along the circumferential direction of the pipe PE.

  The cutting blade 101 is provided on a L-shaped frame 106 having a blade supporting arm portion 106A parallel to the axial direction of the pipe PE and a base end portion 106B that meshes with the screw portion 103A of the rotating shaft 103. Yes.

  In such a configuration, when the scraper 100 is attached to the pipe PE, the nut member 103 is rotated on the rotating shaft 102, and the base portion of the link member 104 engaged with the screw portions 103A and 103B of the nut portion 103 is reciprocally opposed. The leg contact plate 105 is moved in the direction of pressing against the inner surface of the pipe PE.

  When the leg contact plate 105 is pressed against the inner surface of the pipe PE, the rotating shaft 102 is rotated by driving a motor or handle (not shown) attached to the shaft end of the rotating shaft 102, and within the nut portion 103. As the rotating shaft 102 advances while rotating, the cutting blade 101 moves while rotating from the end face side of the pipe PE to cut the outer peripheral surface of the pipe PE.

The above configuration has the following problems.
The diameter expanding and contracting operations of the link portion 104 are performed by rotating the nut member 103.
When the diameter is reduced, the base portion of the link portion 104 moves on the screw portions 103 </ b> A and 103 </ b> B of the nut member 103 by rotation in the opposite direction to that when the diameter is increased.
However, since the base part of the link part 104 engages with the screw parts 103A and 103B, respectively, is a precondition for performing each operation of the diameter expansion and the diameter reduction, so that it moves to a predetermined diameter reduction amount as in the case of the diameter expansion. Until then, the nut member 103 must be operated. Thereby, there is a possibility that the operation time at the time of diameter reduction as well as at the time of diameter expansion becomes long.

  In addition, since the base portion of the link portion 104 is engaged with the nut portion 103 at a plurality of positions in the axial direction, when the nut portion 103 is rotated, sliding resistance at the screw portions 103A and 103B is increased, and the rotation is performed. The operating force increases. For this reason, there exists a possibility that the work burden of rotation operation may become large.

By the way, the frame 106 whose side view is L-shaped is integrated with the rotary shaft 102 by inserting a base end portion 106B of the frame 106 through the rotary shaft 102.
In such a configuration, it is important for the base end portion 106B to be held in a state perpendicular to the axis of the rotating shaft 102 in order to properly determine the facing relationship between the cutting blade 101 and the outer peripheral surface of the pipe PE. It becomes.

However, if the base end portion 106B and the insertion portion of the rotating shaft 102 are not sufficiently fixed, the base end portion 106B tends to fall toward the axis of the rotating shaft 102 (the direction indicated by the arrow in FIG. 7).
Therefore, in the configuration disclosed in Patent Document 3, the base end portion 106B of the frame 106 is sandwiched in the axial direction of the rotary shaft 102 using the wing nut 107 and the flange 102B facing each other with the base end portion 106B interposed therebetween. Configuration is used.

However, in this configuration, if the tightening state of the wing nut 107 is not perfect, there is a possibility that the base portion will easily fall down.
As described above, the scraper support structure disclosed in Patent Document 3 has a problem that not only the burden of the diameter expansion and diameter reduction work increases, but also the cutting blade 101 cannot be accurately held.

On the other hand, at the time of cutting, cutting waste such as swarf is generated.
Since the scraper 100 described above starts cutting from the end face side of the pipe PE, cutting waste generated at the start of cutting tends to sag toward the center of the cross section of the pipe end face.
Since the rotary shaft 102 and the nut member 103 into which the rotary shaft 102 is inserted are located at the center of the cross section of the pipe end surface, the dripping cutting waste may enter the rotary shaft insertion portion of the nut portion 103.

  When cutting waste enters the rotary shaft insertion portion, it becomes entangled with the rotary shaft 102, which may cause rotation failure. In addition, if the entering cutting waste is clogged with the rotary shaft 102, frictional heat may be generated when the rotary shaft 102 rotates, and the cutting waste may be softened. When the cutting waste is softened, it may be wound around the outer peripheral surface of the rotating shaft 102. As a result, a rotation failure or an increase in rotation load occurs.

  As disclosed in Patent Document 3, in the conventional scraper, the flange 105 </ b> A for preventing the leg fixing plate 105 from inadvertently entering the pipe is only provided on the fixing leg 105. It is impossible to prevent the cutting waste that has passed over 105A from entering the rotating shaft insertion portion described above.

In view of the problems in the conventional cutting tool, the object of the present invention is to improve the workability at the time of fixing and removing from the inner surface of the pipe, and to prevent the occurrence of rotation failure of the rotating shaft due to cutting waste. It is to provide a cutting tool.
In particular, the double action of the cutting blade to the cutting work start position can be performed quickly with a simple structure, and harmful effects caused by cutting waste can be prevented with a simple structure without preparing a special structure. Attention is focused on reliably preventing the alignment between the cutting blade and the outer peripheral surface of the pipe from changing due to the falling of the support frame.

In order to achieve this object, the present invention has the following configuration.
(1) A cutting tool used for cutting the outer peripheral surface of a pipe,
A fixed leg piece that is attached to the X-shaped link member, and that can be contacted and separated from the inner surface of the tube in conjunction with an operation in which the X-shaped link member expands and contracts in the radial direction of the tube;
A pair of link support members that support an end of the X-shaped link member opposite to the installation end of the fixed leg piece;
A tube shaft that is supported so that one of the link support members can move in a direction in which the link support member is in contact with or separated from the other;
Rotation that is fastened to a screw formed on the outer peripheral surface of the tube shaft and moves in the axial direction of the tube shaft to move one of the link support members in a direction to contact or separate from the other An operation member;
A coil spring loaded on the tube shaft and biasing one of the link support members away from the other;
A rotary shaft reverse operation member that is provided adjacent to the rotary operation member and can be engaged and disengaged by external operation with respect to a screw formed on the cutting blade feed rotary shaft;
A blade support frame that is integrated with the cutting blade feed rotation shaft and is movable in the axial direction of the cutting blade feed rotation shaft while rotating the cutting blade along the circumferential direction of the tube;
The rotational operation member moves in a direction against the biasing force of the coil spring, thereby pushing one of the link support members interlocked therewith to extend the X-shaped link member in the radial direction of the tube. The fixed leg piece can be pressed against the inner surface of the pipe,
The rotary shaft return operation member can be moved in the axial direction without rotating the cutting blade feed rotary shaft when the fastening with the screw of the cutting blade feed rotary shaft is released by an external operation. And
The fixed leg piece is provided with a non-slip portion on the surface facing the inner surface of the tube and between a pair of dam plates including one that can contact the end surface of the tube and the dam plate A cutting tool characterized in that a cutting waste receiving portion including a concave portion is provided.

(2) In the cutting tool according to (1),
As a mechanism for fastening and unfastening the screw formed on the rotary shaft for cutting blade feeding, the rotary shaft return operation member,
A piece having a long hole formed with a female screw that partially meshes with the screw,
A frame support member that slidably supports the frame along the long axis direction of the elongated hole;
A spring that is disposed between the frame body support member and the frame body and that imparts a habit of engaging a screw formed in the elongated hole on the frame body side with a screw of the cutting blade feed rotation shaft. ,
A cutting tool, wherein the engagement with the screw of the cutting blade feed rotating shaft can be released by moving the frame against the behavior of the spring.

(3) In the cutting tool according to (1) or (2),
A cutting tool, wherein the pair of link support members are provided with link attachment portions projecting in radial directions at equal positions along the circumferential direction.

(4) In the cutting tool according to any one of (1) to (3),
One of the pair of link support members is used as a slide side link support member that is slidable on the tube axis, and the other one of the link support members is a fixed side fixed to the tube axis. Used as a link support member,
When the rotational operation member moves in a direction against the bias of the coil spring, the sliding side link support member is pushed by the rotational operation member and moves in a direction approaching the fixed side link support member. A cutting tool characterized in that when the rotational operation member moves in the urging direction of the coil spring, it is pushed by the urging force of the coil spring to follow and move to a position where the movement of the rotational operation member is stopped. .

(5) In the cutting tool according to (1),
The blade support frame has a L-shaped side view when a support member with a flange fixed to the rotating shaft for feeding the cutting blade is inserted into a base portion and has a blade support arm extending from the base portion in the axial direction of the tube. It is composed of a member
The base is provided with a detachable locking plate with respect to the base at a position facing the flange of the support member across the base of the blade support frame.
The locking plate is fixed to the base portion in a state where it enters a cut portion formed in the support member, so that the base portion is sandwiched with the flange of the support member so that the base portion faces the axial center of the tube. A cutting tool characterized in that it is prevented from falling in the opposite direction.

  According to the present invention, in the expansion and contraction operation of the X-shaped link member in the radial direction of the tube, the X-shaped link member is moved in the radial direction of the tube by pushing and moving one of the link support members in the operation direction of the rotation operation member. When the X-shaped link member is contracted in the radial direction of the tube, it can be forcibly moved backward using the bias of the coil spring. Therefore, unlike the case of sliding the link support member on a plurality of screws, the configuration can be simplified and the link support member can be quickly returned to the initial position. Thereby, the working time required for cleaning up at the end of the cutting work can be shortened.

Further, by providing a cutting waste receiving portion on the fixed leg piece, when cutting waste generated when cutting the outer peripheral surface of the pipe by the rotation of the cutting blade hangs down from the pipe end face, the cutting waste holder located near the pipe end face is provided. Entangled in the part.
Thereby, since the cutting waste entangled with the cutting waste receiving portion is entangled in a pincushion shape by the rotation of the cutting blade, the cutting waste is caught in the meshing portion with the threaded portion of the pipe shaft exposed from the pipe end surface. Intrusion can be reliably prevented.
As a result, it is possible to prevent a rotation failure of the rotation shaft and an increase in the rotation load due to the cutting waste that has entered the rotation shaft insertion portion.

In addition, the cutting blade that has finished cutting the outer peripheral surface of the tube has a rotating shaft that can be engaged with and released from the screw formed on the rotating shaft for the cutting blade with which the blade support frame is integrated. By using the moving operation member, the rotating shaft released from the fastening can be moved in the axial direction without rotating.
In particular, since the rotary shaft return operation member is located at a position adjacent to the rotation operation member, in other words, in the vicinity of the pipe end face, it can be easily operated from the outside of the pipe end face. It is possible to quickly perform the backward operation to the start position.

  In the present invention, the base of the blade support frame is sandwiched between the flange of the support member integrated with the rotary shaft for the cutting blade and the locking plate that can be attached to and detached from the base. Can be maintained. Thus, unlike clamping by fastening, the blade support frame can be reliably prevented from falling over time without being displaced even when subjected to vibration during rotation of the rotating shaft.

It is a perspective view which shows the tool for cutting by this invention. It is a side view of the cutting tool shown in FIG. It is a disassembled perspective view for demonstrating the principal part structure of the tool for cutting shown in FIG. It is a front view for demonstrating the structure of the rotating shaft reverse operation member used for the principal part structure shown in FIG. It is a typical perspective view for demonstrating the structure which inserts | pinches the blade support frame used for the principal part structure shown in FIG. It is a figure for demonstrating the partial modification of the principal part structure shown in FIG. It is a schematic diagram for demonstrating the conventional structure of the tool for cutting.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
1 and 2 are a perspective view and a side view showing an overall configuration of a grinding tool according to the present invention.

  1 and 2, the cutting tool 1 includes a pair of fixed leg pieces 3 attached to one end portion in the extending direction of the X-shaped link member 2 and a pair of other ends supporting the other end in the extending direction of the X-shaped link member 2. The link support members 4A and 4B, the tube shaft 5 in which the link members 4A and 4B are arranged along the axial direction and formed with a screw portion 5A on a part of the outer periphery, and the pair of link support members 4A and 4B in the tube shaft 5 A coil spring 6 inserted between them, a rotation operating member 7 for moving one of the link support members in the axial direction of the tube shaft 5 by meshing with the threaded portion 5A of the tube shaft 5, and the tube shaft 5 A mechanism for fastening and releasing the fastening with respect to a screw formed on the cutting blade feed rotary shaft 8 inserted into the cutting blade feed rotary shaft 8 is provided. Rotating shaft return operation member 9 for moving the shaft in the axial direction, and cutting While rotating the cutting blade is integrated in the shaft end of the feed rotary shaft 8 and a blade support frame 10 movable in the axial direction of the 該切 Kezuha feeding rotary shaft 8. Hereinafter, each member will be described.

FIG. 3 is an exploded perspective view of each member described above.
In the same figure, the fixed leg piece 3 is composed of a piece member having a curvature that can be contacted and separated from the inner surface of the resin pipe PE, and a non-slip portion 3A having a high friction coefficient on the surface facing the inner surface of the pipe. Is provided.
The anti-slip portion 3A is configured by attaching a tape provided with a material having a high friction coefficient on the surface or roughening the surface.
The anti-slip portion 3A serves to prevent inadvertent rotation due to torque generated when the cutting blade described later is rotated when the fixed leg piece 3 is pressed against the inner surface of the resin pipe PE. It is like that.

On one side in the axial direction of the resin pipe PE in the fixed leg piece 3, there is provided a cutting waste receiving part 3 </ b> C configured by a recess formed between a pair of weir plates 3 </ b> B including one that abuts against the end surface of the resin pipe PE. It has been.
The cutting waste receiving part 3C is exposed to the outside from the end surface of the resin pipe PE by one of the barrier plates 3B abutting against the end surface of the inter-resin PE, and the outer periphery of the inter-resin PE when cut by a cutting blade described later. It is used as a part that prevents cutting chips that hang from the surface from getting tangled and dropping to the axial side.

  One of the link support members 4A, 4B provided as a pair is used as a slide-side link support member that can be pushed and moved in the axial direction of the tube shaft 5 by a rotation operation member 7 described later. The other one is used as a fixed-side link member fixed to the tube shaft 5.

  The pair of link support members 4A and 4B are provided with link mounting portions 4A1 and 4B1 that project radially in the circumferential direction, and in the illustrated embodiment, in the equally divided position in the illustrated embodiment, the X-shaped link member 2 The end of the fixed leg 3 opposite to the installation end is attached and supported.

The tube shaft 5 is a member capable of arranging a pair of link support members 4A and 4B along the axial direction, and a threaded portion 5A is formed on the outer peripheral surface on the side where the slide-side link member 4A is located. .
A cutting blade feed rotary shaft 8 having a screw formed on the outer peripheral surface is inserted into the tube shaft 5, and a female screw 7 </ b> A that engages with the screw is formed on the inner surface of the screw forming portion. The rotating operation member 7 is loaded.

  Between the pair of link support members 4A and 4B in the axial direction of the tube shaft 5, a sliding side link support member 4A corresponding to one of the link members is connected to a fixed side corresponding to the other one of the link members. A coil spring 6 that is biased in a direction away from the link support member 4B is inserted.

The state in which the sliding link support member 4A is separated from the fixed link member 4B by the coil spring 6 is the folded state of the X-shaped link member 2, in other words, the fixed leg piece 3 is separated from the inner surface of the resin pipe PE. This state corresponds to the initial state of the pair of link support members 4A and 4B.
When the sliding-side link support member 4A is pushed from the initial state in the direction approaching the fixed-side link support member 4B against the bias of the coil spring 6, the X-shaped link member 2 becomes the resin pipe PE. The fixed leg piece 3 can be pressed against the inner surface of the pipe by extending in the radial direction.

The rotation operation member 7 is a nut member formed on the inner surface with a female screw 7A that meshes with a screw of the tube shaft 5, and the rotation operation arm 7B is provided on the outer peripheral surface at a position facing the center of the cross section.
When the rotation operation member 7 is rotated by using the rotation operation arm 7B, the rotation operation member 7 can move on the screw of the tube shaft 5 according to the rotation direction.

  For this reason, the rotation operation member 7 moves the link support member 4A on the adjacent sliding side against the bias of the coil spring 6 to move it toward the link support member 4B on the fixed side, thereby causing the X-shaped link member to move. 2 is extended in the radial direction of the resin pipe PE, and the link support member 4A on the sliding side is moved away from the link member 4B on the fixed side by the bias of the coil spring 6 so that the X-shaped link member 2 is made of resin. It is a member that can set the case of contracting in the radial direction of the pipe PE.

  By using such a rotation operation member 7 to move the link support member 4A on the tube axis, the link support members 4A and 4B are moved using a plurality of screws having opposite lead directions set. Unlike the case, the movement in both directions can be made with only a single screw.

  Moreover, when returning to the initial position, the biasing force of the coil spring 6 is used to automatically move the sliding side in response to the rotation operation member 7 moving away from the fixed side link support member 4B. The link support member 4A can be double-actuated. As a result, the number of screws used in the moving mechanism of the link support member can be reduced to simplify the structure, and a quick double-action operation is possible.

  On the other hand, the cutting blade feed rotary shaft 8 inserted into the tube shaft 5 has an end portion where a screw portion is formed in the axial direction, that is, an end portion adjacent to the rotation operation member 7. A rotary shaft reverse operation member 9 is provided so as to be fastened by a screw.

  The rotary shaft return movement operating member 9 can be moved in the axial direction without being rotated by rotating the cutting rotary shaft 8 when it is fastened to the screw formed on the cutting blade feed rotary shaft 8. It is a member that can be selected when possible.

  The case where the cutting blade feed rotary shaft 8 is moved in the axial direction without rotating corresponds to the case where the cutting blade is pulled back to the end face side of the resin pipe PE from the position where cutting by the cutting blade described later is completed. In this case, as will be described later, the blade support frame 10 having a cutting blade and integrated with the cutting blade feed rotating shaft 8 moves in the axial direction without requiring a rotating operation, thereby cutting. It can move to the end face side of the resin pipe PE corresponding to the start position.

The rotary shaft return operation member 9 includes the following members as a mechanism for fastening and releasing the screw with respect to the cutting rotary shaft 8.
4, a long hole 9A1 having a screw portion 9A1A that meshes with a screw formed on the cutting rotary shaft 8 is formed, and a piece body 9A that can slide in the radial direction of the tube shaft 5 in FIG. The frame body supporting member 9B, which is slidably supported along the radial direction of the tube shaft 5 by fitting the frame body 9A, and the screw portion 9A1A of the frame body 9A are always meshed with the thread portion of the cutting rotary shaft 8. And a spring 9C biasing in the direction.

  The rotary shaft reverse operation member 9 has the habit of engaging the screw portion 9A1A of the frame body 9A with the screw portion of the cutting rotary shaft 8 by the biasing of the spring 9C (indicated as the biasing direction in FIG. 4). Behavior), when the frame body 9A is pushed down against the bias of the spring 9C (indicated as the pressing direction in FIG. 4), the screw portion 9A1A is separated from the screw of the rotary shaft 8 for cutting, and the elongated hole 9A1 is formed. The meshing can be released by facing each other.

Since the rotary shaft reverse operation member 9 is provided so as to be exposed to the outside from the end surface of the resin pipe PE, like the rotation operation member 7, the operation position can be easily visually recognized from the outside of the end surface of the resin tube PE. it can.
Thereby, even when the fixed leg piece 3 enters the pipe PE, the X-shaped link member 2 can be contracted to move the cutting blade CT toward the end surface of the resin pipe PE, and the cutting blade CT can be quickly moved. It is possible to return to the initial position.
When such an action is performed after the fixed leg piece 3 is taken out from the inside of the pipe, in other words, compared with the case where the rotary shaft double-action operating member 9 is not provided near the end face of the resin pipe PE, the visual recognition is good. As a result, the time until the cutting blade is returned to the cutting start position can be shortened because there is no need to search for the position of the rotary shaft reverse operation member.

On the other hand, a support member 11 made of a boss member that supports the blade support frame 10 is integrated with an end portion of the cutting blade rotating shaft 8, specifically, an end portion on the side where the screw portion is formed.
The support member 11 is used as a member for sandwiching a base portion 10A of a blade support frame 10 described later in cooperation with a locking plate 12 described later, and a handle 13 for rotational driving at the shaft end or a motor connecting portion (not shown). It is a member provided with.

FIG. 5 is a view for explaining a configuration for sandwiching the base portion 10 </ b> A of the blade support frame 10 using the support member 11 and the locking plate 12 engageable with the support member 11.
In the drawing, a part of the support member 11 in the axial direction is provided with a flange 11A that abuts a base 10A of a blade support frame 10 described later, and an insertion formed in a base 10A of a blade support frame 10 described later. A flat portion 11B matching the shape of the hole 10A1 is formed at a position facing the center of the cross section.
Further, as shown in FIG. 5, a cut 11B1 is formed in one of the flat portions 11B, and a locking plate 12 fastened to a base portion of a blade support frame 10 described later can enter the cut 11B1. It has become.

As shown in FIG. 3, the blade support frame 10 is bent at a right angle from the base 10 </ b> A having an insertion hole 10 </ b> A <b> 1 constituted by a long hole having a longitudinal long axis through which the support member 11 is inserted, and the base 10 </ b> A. And a blade support arm 10B that is parallel to the axial direction of the tube shaft 5, and is configured by a frame having an L-shaped shape in a side view.
At the tip of the blade support arm 10B of the blade support frame 10, a cutting blade CT attached to the blade block 10B1 is mounted.

In the base portion 10A of the blade support frame 10, a plurality of tube diameter positioning holes 10A2 are formed on an end surface in a direction perpendicular to the penetration direction of the insertion hole 10A1 of the support member 11.
Either one of the tube diameter positioning holes 10A2 is selected and inserted into the screw holes formed in the flat portion 11B of the support member 11 through the fixing bolts 14, so that the blade support frame 10 is attached to the outside of the resin tube PE. It is used to maintain a state where the cutting blade is positioned at a position corresponding to the diameter.

The base plate 10A of the blade support frame 10 is provided with a locking plate 12 detachably through fastening at a position adjacent to the insertion hole 10A1 described above.
When the locking plate 12 is fixed by being partially inserted into the notch 11B1 provided in the flat surface portion 11B protruding from the insertion hole 10A1 of the blade support frame 10, the locking plate 12 and the flange 11A on the support member 11 side are fixed. It is used as a member that can sandwich the base 10A.

In this way, when the base portion 10A is sandwiched between the flange 11A on the support member 11 side and the locking plate 12, the base portion 10A can be prevented from falling toward the axis of the tube shaft 5.
In the flange 11 </ b> A and the locking plate 12, the facing distance corresponds to the thickness of the base portion 10 </ b> A of the blade support frame 10.
For this reason, unlike the case where the base portion is sandwiched by fastening with screws, for example, the screws are not loosened, so that it is possible to prevent a strong fall.
As a result, it is possible to maintain a state in which there is no deviation in the facing relationship between the cutting blade CT and the outer peripheral surface of the resin pipe PE, which may occur when the collapse occurs.

The characteristics of the cutting tool 1 configured as described above will be described as follows.
The cutting tool 1 according to the present invention is characterized by a cutting waste receiving portion 3 </ b> C provided on the fixed leg piece 3.
That is, when cutting is started from the end face side of the resin pipe PE, the cutting waste generated by the cutting drips down to the end face side of the resin pipe PE.
For this reason, since the cutting waste receiving portion 3C is a recess provided at a position exposed from the end face of the resin pipe PE in the fixed leg piece 3, the cutting waste generated when being cut by the cutting blade CT is the cutting waste. It gets entangled in the recess of the receiving part 3C.
Thereafter, when the cutting blade CT is continued, the fixed cutting waste receiving portion 3C is entangled in a bobbin shape.

As a result, it is possible to prevent cutting waste from entering the rotational operation member 7 exposed from the end face of the resin pipe PE and the meshing position of the threaded portion between the rotation operating member 7 and the pipe shaft 5.
Accordingly, since the cutting waste does not enter the screw engagement position, it is possible to prevent a rotation failure and an increase in rotational load that occur when the cutting waste enters.

  According to the present embodiment, the cutting waste that hangs down toward the center of the cross section of the resin pipe PE is provided on the fixed leg piece 3 and is used to prevent the fixed leg piece 3 from entering the pipe. Therefore, it is not necessary to prepare a special structure for preventing invasion of cutting chips. As a result, it is only necessary to use a part of the existing components, so that it is possible to prevent a rotation failure of the rotating member and an increase in rotation load with a simple configuration.

Next, a partial modification of the configuration used in the above embodiment will be described.
FIG. 6 is a view showing a deformed portion, and shows the blade block 10B1 having the cutting blade CT.

  The deformable portion shown in FIG. 6 is characterized by facilitating the extraction work when the cutting scraps entangled in a state of being wound around the resin pipe PE after the cutting is started from the end face side of the resin pipe PE after the cutting is completed. is there.

In FIG. 6, the blade block 10B1 has a receiving portion 10B2 for the cutting blade CT formed in the lower portion, and the cutting blade CT fitted in the receiving portion 10B2 is fixed by fastening a holding plate 10B3 made of an angle piece. .
The holding plate 10B3 is provided with a cutting waste relief portion 20 having a gradient surface 20A in a direction away from the outer peripheral surface of the resin pipe PE along the moving direction of the cutting waste CP.

  When cutting is started from the end face side of the resin pipe PE, the cutting waste generated at the starting position is wound around the cutting waste receiving portion 3C and wound around in a pincushion shape, but the end face in the axial direction of the resin pipe PE At a position away from the side, the cutting waste tends to be wound in a state of sticking to the outer peripheral surface of the resin pipe PE.

  Therefore, in the configuration shown in FIG. 6, the cutting waste relief portion 20 moves the cutting waste CP generated when being cut by the cutting blade CT in a direction away from the outer peripheral surface of the resin pipe PE according to the angle of the inclined surface. Let

Thereby, the cutting waste CP to be wound around the outer peripheral surface of the resin pipe PE does not move in accordance with the clearance angle of the cutting blade CT as shown in FIG. Then, it moves along the gradient surface 20 </ b> A of the cutting punch escape portion 20.
At this time, the cutting waste CP moves in a direction away from the outer peripheral surface of the resin pipe PE, whereby the tension when winding the resin pipe PE is applied to the gradient surface 20A. As a result, the cutting waste CP is elongated due to the tension acting on the inclined surface, and this elongation is generated as slack when wound around the resin pipe PE.

  The cutting scrap CP wound around the outer peripheral surface of the resin pipe PE after passing through the cutting punch escape portion 20 is not attached to the outer peripheral surface of the resin pipe PE, but is wound in a loose state, so that the cutting is completed. At this time, when the resin pipe PE is pulled out, unlike the case of sticking, it is easily pulled out in the axial direction due to the slack.

  In such a deformed portion configuration, the cutting blade CP moves in the axial direction of the resin pipe PE while rotating, and therefore, as the cutting blade CT moves away from the vicinity of the end portion, the cutting waste CP is transferred to the resin tube. Since it can relieve winding in the state stuck on the outer peripheral surface of PE, the effort which removes cutting waste from the outer peripheral surface of resin pipe PE after a cutting operation will be reduced.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 X-shaped link member 3 Fixed leg piece 3A Non-slip part 3B Weir plate 3C Cutting waste receptacle part 4A Link support member on the sliding side 4B Link support member on the fixed side 5 Tube shaft 5A Screw part 6 Coil spring 7 Rotating operation member 7A Female screw 8 Rotating shaft for cutting blade feeding 9 Rotating shaft returning operation member 9A Frame body 9A1 Long hole 9A1A Screw portion 9B Frame body supporting member 10 Blade supporting frame 10A Base 10B Blade supporting arm 10B1 Blade block 11 Supporting member 11A Flange 11B Flat surface 11B1 Cut 12 Locking plate

Claims (5)

A cutting tool used for cutting the outer peripheral surface of a pipe,
A fixed leg piece that is attached to the X-shaped link member, and that can be contacted and separated from the inner surface of the tube in conjunction with an operation in which the X-shaped link member expands and contracts in the radial direction of the tube;
A pair of link support members that support an end of the X-shaped link member opposite to the installation end of the fixed leg piece;
A tube shaft that is supported so that one of the link support members can move in a direction in which the link support member is in contact with or separated from the other;
Rotation that is fastened to a screw formed on the outer peripheral surface of the tube shaft and moves in the axial direction of the tube shaft to move one of the link support members in a direction to contact or separate from the other An operation member;
A coil spring loaded on the tube shaft and biasing one of the link support members away from the other;
A rotary shaft reverse operation member that is provided adjacent to the rotary operation member and can be engaged and disengaged by external operation with respect to a screw formed on the cutting blade feed rotary shaft;
A blade support frame that is integrated with the cutting blade feed rotation shaft and is movable in the axial direction of the cutting blade feed rotation shaft while rotating the cutting blade along the circumferential direction of the tube;
The rotational operation member moves in a direction against the biasing force of the coil spring, thereby pushing one of the link support members interlocked therewith to extend the X-shaped link member in the radial direction of the tube. The fixed leg piece can be pressed against the inner surface of the pipe,
The rotary shaft return operation member can be moved in the axial direction without rotating the cutting blade feed rotary shaft when the fastening with the screw of the cutting blade feed rotary shaft is released by an external operation. And
The fixed leg piece is provided with a non-slip portion on the surface facing the inner surface of the tube and between a pair of dam plates including one that can contact the end surface of the tube and the dam plate A cutting tool characterized in that a cutting waste receiving portion including a concave portion is provided. The cutting tool according to claim 1, wherein
As a mechanism for fastening and unfastening the screw formed on the rotary shaft for cutting blade feeding, the rotary shaft return operation member,
A piece having a long hole formed with a female screw that partially meshes with the screw,
A frame support member that slidably supports the frame along the long axis direction of the elongated hole;
A spring that is disposed between the frame body support member and the frame body and that imparts a habit of engaging a screw formed in the elongated hole on the frame body side with a screw of the cutting blade feed rotation shaft. ,
A cutting tool, wherein the engagement with the screw of the cutting blade feed rotating shaft can be released by moving the frame against the behavior of the spring. The cutting tool according to claim 1 or 2,
A cutting tool, wherein the pair of link support members are provided with link attachment portions protruding radially at equal positions in the circumferential direction. The cutting tool according to any one of claims 1 to 3,
One of the pair of link support members is used as a slide side link support member that is slidable on the tube axis, and the other one of the link support members is a fixed side fixed to the tube axis. Used as a link support member,
When the rotational operation member moves in a direction against the bias of the coil spring, the sliding side link support member is pushed by the rotational operation member and moves in a direction approaching the fixed side link support member. A cutting tool characterized in that when the rotational operation member moves in the urging direction of the coil spring, it is pushed by the urging force of the coil spring to follow and move to a position where the movement of the rotational operation member is stopped. . The cutting tool according to claim 1, wherein
The blade support frame has a L-shaped side view when a support member with a flange fixed to the rotating shaft for feeding the cutting blade is inserted into a base portion and has a blade support arm extending from the base portion in the axial direction of the tube. It is composed of a member
The base is provided with a detachable locking plate with respect to the base at a position facing the flange of the support member across the base of the blade support frame.
The locking plate is fixed to the base portion in a state where it enters a cut portion formed in the support member, so that the base portion is sandwiched with the flange of the support member so that the base portion faces the axial center of the tube. A cutting tool characterized in that it is prevented from falling in the opposite direction.

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