JP5657625B2 - Perforated blade - Google Patents

Description

  The present invention relates to a perforating blade used for perforating a synthetic resin pipe to form a branching hole, and for lifting the blade body from the synthetic resin pipe after perforating.

Synthetic resin pipes are widely used in various fields as piping for sending fluids such as water and gas. When the fluid flowing through the synthetic resin pipe is branched, a through hole is formed in the synthetic resin pipe, and a branch pipe is attached to the through hole.
As a means for drilling a through-hole in a synthetic resin tube, conventionally, it is screwed into a female threaded support member attached to the outer periphery of the synthetic resin tube, and rotates and advances and retreats in a direction crossing the synthetic resin tube. Attach a drilling blade having a cylindrical blade that drills into the tube wall of the synthetic resin tube to the tip of the operation shaft, and rotate the operation shaft by applying the blade to the tube wall of the synthetic resin tube. Means are known in which the tube wall of the synthetic resin tube is pushed and perforated by a cylindrical blade body of a perforating blade that advances and advances while rotating integrally with the operation shaft.
However, in this punching means, the cylindrical blade body of the drilling blade that moves forward pushes the tube wall of the synthetic resin tube while rotating, so that the resin around the blade body is in close contact with the periphery of the blade body and the periphery of the rotating blade body is rotated. Since the resin corresponding to the direction and the depth of drilling acts as a large frictional resistance, a large torque is required to rotate the drilling blade. In particular, when the diameter of the drilling hole is large, a larger torque is required for the rotation of the drilling blade, making the drilling operation difficult.

In order to solve such a problem, a feed screw portion that has an engaging portion that engages with the rotary handle at the upper portion and rotates to apply thrust to the cutter portion, and a friction reducing member is provided on the lower surface of the feed screw portion. There has been proposed a tapping cutter including the cutter portion that is mounted and rotatably attached with a C-shaped retaining ring for preventing dropping (see, for example, Patent Document 1).
In the tapping cutter described in Patent Document 1, since the feed screw part and the cutter part are rotatable, the cutter part does not rotate even if the feed screw part is rotated, and only the thrust is applied to the cutter part. The cutting blade is pressed against the surface of the synthetic resin tube to perform perforation. In this case, since the cutter portion does not rotate, the frictional resistance of the resin that is in close contact with the cutting blade is small, and the rotational torque of the feed screw portion is small.

JP-A-7-68497

  The tapping cutter described in the above-mentioned patent document 1 is provided with a friction reducing member on the lower surface of the feed screw portion, and the cutter portion is rotatably attached with a C-shaped retaining ring for preventing falling off. Even if the screw part is rotated, the cutter part does not rotate and only thrust is applied to the cutter part. However, when pulling up after drilling, when the feed screw part is reversely rotated backward, the cutter part becomes a C-shaped retaining ring. Since the cutter part is pulled up by contact, a frictional resistance is generated between the cutter part and the C-shaped retaining ring, the rotation of the feed screw part is transmitted to the cutter part via the C-shaped retaining ring, and the cutter part is pulled up while rotating. It will be. As a result, the circumferential direction of the rotating cutter part and the perforated thickness of resin act as a large frictional resistance, so the rotational torque of the feed screw part increases, and the cutter part and C-shaped stopper are used during the lifting operation of the cutter part. When a large frictional resistance acts between the ring and the ring, the C-shaped retaining ring is broken or detached from the feed screw part, and the cutter part may fall off from the feed screw part and remain in the synthetic resin tube. .

  An object of the present invention is to reduce the frictional resistance acting on the blade body when pulling up the drilling blade from the synthetic resin tube after drilling, making it easy to pull up the drilling blade and preventing the blade body from falling off. To provide a blade.

  In order to achieve the above object, the invention described in claim 1 is screwed into a female threaded support member attached to the outer periphery of the synthetic resin pipe, and rotates in a direction crossing the synthetic resin pipe. A drilling blade attached to the tip of the operating shaft that moves forward and backward, and drilled in the tube wall of the synthetic resin pipe, comprising a cylindrical blade body and an adapter that attaches the blade body to the tip of the operation shaft The adapter includes an operation shaft mounting member that is detachably attached to a tip of the operation shaft, and a blade body mounting rotation member that is rotatably supported by the operation shaft mounting member and attaches the blade body, The operation shaft mounting member is provided with a mounting portion to be attached to the supporting member with the female thread on one end side in the axial direction of the operation shaft mounting member main body, and the operation shaft mounting member is provided on the other end side. A support shaft portion that is smaller in diameter than the shaft mounting member main body and rotatably supports the blade body mounting rotation member is provided on the same axis, and an outer casing is provided at a lower portion of the support shaft portion. Further, the blade body mounting rotary member is formed of a cylindrical body having an outer diameter of the upper portion larger than the outer diameter of the outer casing, and is fitted to the outer periphery of the support shaft portion, and both ends thereof are The operation shaft mounting member main body and the outer casing are rotatably supported via a friction reducing member, and the upper portion of the blade body is screwed onto the outer periphery of the blade body mounting rotation member. And

  According to a second aspect of the present invention, the outer casing provided at the lower portion of the support shaft portion according to the first aspect is configured separately from the support shaft portion, and is attached to and detached from a lower outer periphery of the support shaft portion. It is characterized by being screwed together.

  According to a third aspect of the present invention, the support shaft portion provided on the other end side in the axial direction of the operation shaft mounting member main body according to the first aspect is configured separately from the operation shaft mounting member main body. The other end of the operation shaft mounting member main body is provided with a female screw portion on the same axis, and an upper portion of the support shaft portion is provided with a male screw portion that is screwed to the female screw portion, and the support shaft portion is The operation shaft mounting member main body is fixed by being screwed into the female thread portion.

  The invention according to claim 4 is characterized in that the outer casing provided in the lower part of the support shaft portion according to claim 3 is configured integrally with the support shaft portion.

  According to a fifth aspect of the present invention, the outer casing provided at the lower portion of the support shaft portion according to the third aspect is configured separately from the support shaft portion, and is attached to and detached from the lower outer periphery of the support shaft portion. It is characterized by being screwed together.

  The invention according to claim 6 is the blade according to any one of claims 1 to 5, wherein the blade body is at least 1 along the circumferential direction on the inner peripheral surface on the receding side from the blade part formed at the tip. Two circumferential grooves are formed.

  According to a seventh aspect of the present invention, in the blade according to any one of the first to sixth aspects, the blade body extends from a tip of the blade portion to a position where the blade portion passes through a tube wall of the synthetic resin tube. The outer periphery on the receding side from the dimension is formed with a small diameter.

  According to the perforated blade of claim 1, it is provided with a cylindrical blade body and an adapter for attaching the blade body to the tip of the operation shaft, and the adapter can be attached to and detached from the tip of the operation shaft. An operation shaft attachment member to be attached, and a blade body attachment rotation member that is rotatably supported by the operation shaft attachment member and attaches the blade body. The operation shaft attachment member is an axial direction of the operation shaft attachment member body. A support portion that is attached to the female threaded support member is provided at one end of the support shaft, and a support shaft portion that is formed to have a smaller diameter than the operation shaft attachment member main body and rotatably supports the blade body attachment rotation member at the other end. Are provided on the same axis, and the outer shaft is provided at the lower portion of the support shaft portion. It is formed of a cylindrical body having a diameter larger than the outer diameter of the outer rod, and is fitted to the outer periphery of the support shaft portion, and both ends thereof are interposed between the operation shaft mounting member main body and the outer rod via a friction reducing member. Since the upper part of the blade body is screwed onto the outer periphery of the blade body mounting rotation member, the operation shaft can be rotated even when the operation shaft is rotated at the time of drilling and pulling up after drilling. Since the blade body screwed onto the outer periphery of the blade body mounting rotation member that is rotatably supported by the support shaft portion of the mounting member does not rotate, there is little frictional resistance of the resin closely contacting the blade body, and the operation shaft Therefore, the drilling work and the pulling-up work after drilling can be easily performed.

In addition, since the blade body mounting rotating member in which the blade body is screwed to the outer periphery is supported by an outer casing provided at the lower portion of the support shaft portion, sufficient mechanical strength is obtained, and When pulling up, the blade body attaching rotary member is removed from the support shaft portion due to the frictional resistance of the resin that is in close contact with the blade body, thereby preventing the blade body attaching rotating member and the blade body from remaining in the synthetic resin tube. be able to.
Moreover, since the upper part of the blade body is screwed onto the outer periphery of the blade body mounting rotary member, only the blade body which is a consumable item can be easily replaced.

  According to the drilling blade of claim 2, the outer casing provided at the lower portion of the support shaft portion according to claim 1 is configured separately from the support shaft portion, and is formed at a lower portion of the support shaft portion. Since it is detachably screwed to the outer periphery, the blade body mounting rotary member is fitted to the outer periphery of the support shaft portion from the lower side of the support shaft portion provided on the other end side of the operation shaft mounting member main body. Then, by screwing an outer casing onto the outer periphery of the lower portion of the support shaft portion, the blade body attaching rotary member can be easily supported rotatably on the outer periphery of the support shaft portion.

  According to the drilling blade of claim 3, the support shaft portion provided on the other end side in the axial direction of the operation shaft mounting member main body according to claim 1 is separate from the operation shaft mounting member main body. Since the female screw portion is provided on the same axis on the other end side of the operation shaft mounting member main body, and the male screw portion that is screwed to the female screw portion is provided on the upper portion of the support shaft portion, The blade attachment rotating member is fitted to the outer periphery of the support shaft portion from above the support shaft portion, and the male screw portion on the upper portion of the support shaft portion is screwed into the female screw portion of the operation shaft attachment member main body. By fixing, the blade body attaching rotary member can be easily rotatably supported on the outer periphery of the support shaft portion.

  According to the drilling blade of claim 4, since the outer casing provided in the lower portion of the support shaft portion according to claim 3 is configured integrally with the support shaft portion, the number of parts is small. Assembling can be easily performed.

  According to the drilling blade of claim 5, the outer casing provided at the lower portion of the support shaft portion according to claim 3 is configured separately from the support shaft portion, and is formed at a lower portion of the support shaft portion. Since the external thread part is detachably screwed to the outer periphery, the male screw part on the upper part of the support shaft part is screwed and fixed to the female thread part of the operation shaft attachment member body, and the support is fixed to the operation shaft attachment member body. The blade attachment rotating member is firmly fitted to the outer periphery of the support shaft portion from the lower side of the shaft portion, and the outer periphery is screwed to the outer periphery of the lower portion of the support shaft portion. And can be supported on the outer periphery of the support shaft.

  According to the drilling blade of claim 6, the blade body according to any one of claims 1 to 5, wherein the blade body has at least one circumference on the inner circumferential surface on the receding side from the blade portion formed at the tip. Since the circumferential groove along the direction is formed, the section cut by the perforation of the tube wall of the synthetic resin tube by the blade body and entered into the cylindrical blade body in a compressed state is a portion of the circumferential groove. Thus, it is restored and engaged in the circumferential groove, so that it is possible to prevent the section of the resin cut into the blade body from falling off the blade body.

  According to the drilling blade of claim 6, in the blade body according to any one of claims 1 to 6, the blade passes through the tube wall of the synthetic resin tube from the tip of the blade. Since the outer periphery on the receding side is smaller than the dimension up to the position, the frictional resistance applied to the blade body soon after the blade portion passes through the tube wall of the synthetic resin tube is reduced, and the operation shaft is rotated. By sensing the applied force, it can be confirmed that the blade has passed through the tube wall of the synthetic resin tube, that is, the drilling of the synthetic resin tube has been completed.

It is a side view which shows the 1st example of embodiment of the drilling blade which concerns on this invention. It is a longitudinal cross-sectional view of FIG. FIG. 2 is an enlarged longitudinal sectional view of a blade body of the drilling blade shown in FIG. 1. It is sectional drawing which shows the state drilled to a synthetic resin pipe | tube with the piercing blade which concerns on this invention using a piercing machine. It is an expanded longitudinal cross-sectional view which shows the process in which a blade cuts off a synthetic resin pipe | tube. It is an enlarged longitudinal cross-sectional view which shows the state which the blade body pushed the synthetic resin pipe | tube and the drilling was completed. It is a longitudinal cross-sectional view which shows the 2nd example of embodiment of the drilling blade which concerns on this invention. It is a longitudinal cross-sectional view which shows the 3rd example of embodiment of the drilling blade which concerns on this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a drilling blade according to the present invention will be described in detail with reference to the drawings.
1 to 6 show a first example of an embodiment of a drilling blade according to the present invention, FIG. 1 is a side view showing an example of an embodiment of a drilling blade according to the present invention, and FIG. FIG. 3 is an enlarged longitudinal sectional view of the blade body of the drilling blade shown in FIG. 1, and FIG. 4 is a sectional view showing a state in which a synthetic resin pipe is drilled with the drilling blade according to the present invention using a drilling machine. 5 is an enlarged longitudinal sectional view showing a process in which the blade body pushes through the synthetic resin tube, and FIG. 6 is an enlarged longitudinal sectional view showing a state in which the blade body pushes through the synthetic resin tube and drilling is completed.

The perforating blade 1 of this example is screwed into a female threaded support member 3 attached to the outer periphery of a synthetic resin tube 2, and is rotated by an operation shaft 4 that moves forward and backward in a direction crossing the synthetic resin tube 2. It has a cylindrical blade body 5 that is rotatably attached to the tip and pierces the tube wall of the synthetic resin tube 2.
In this example, the drilling blade 1 is configured by a blade body 5 and an adapter 6 that is provided on the blade body 5 and that rotatably attaches the blade body 5 to the tip of the operation shaft 4.

  In the adapter 6 that rotatably attaches the blade body 5 to the distal end of the operation shaft 4, the operation shaft attachment member 7 that is detachably attached to the distal end of the operation shaft 4, and is rotatably supported by the operation shaft attachment member 7. The blade body attaching rotary member 8 to which the blade body 5 is attached is constituted.

The operation shaft attachment member 7 is provided with an attachment portion 10 attached to the support member 3 with the internal thread on one end side in the axial direction of the operation shaft attachment member main body 9 and on the other end side from the operation shaft attachment member main body 9. A support shaft portion 11 that is formed in a small diameter and rotatably supports the blade body mounting rotary member 8 is provided on the same axis, and is fitted on the outer periphery of the support shaft portion 11 at the lower portion of the support shaft portion 11 as will be described later. The outer blade 12 for supporting the combined blade body attaching rotary member 8 is provided.
In this example, the support shaft portion 11 and the outer flange 12 are configured separately, a male screw portion 13 is provided on the outer periphery of the lower portion of the support shaft portion 11, and a female screw portion 14 is provided on the outer flange 12. An outer collar 12 is detachably screwed to the portion 11. A male screw part 13 provided on the support shaft part 11 and a female screw part 14 provided on the outer casing 12 are provided with a set screw 15 for preventing loosening between the male screw part 13 and the female screw part 14 to be screwed together, thereby preventing rotation. ing.

The blade attachment rotating member 8 is formed of a cylindrical body having an outer diameter larger than the outer diameter of the outer casing 12, and is rotatably fitted to the outer periphery of the support shaft portion 11, and both ends thereof are attached to the operation shaft. The member main body 9 and the outer casing 12 are rotatably supported via a friction reducing member 16.
The blade body attaching / rotating member 8 is supported by fitting the blade body attaching / rotating member 8 to the outer periphery of the supporting shaft portion 11 from the lower side of the supporting shaft portion 11 provided on the operation shaft attaching member main body 9. The blade attachment rotating member 8 is supported by screwing the outer casing 12 into the outer periphery of the lower portion of the blade 11.
In this example, a fluororesin sheet is used as the friction reducing member 16 interposed between both ends of the blade body attaching / rotating member 8 and the operation shaft attaching member main body 9 and the outer casing 12. However, other synthetic resin sheets or bearings are used. May be used.

A male screw portion 17 is provided on the outer periphery of the blade body attaching rotary member 8, and a female screw portion 18 is provided on the upper portion of the blade body 5, and a male screw portion 17 provided on the outer periphery of the blade body attaching rotary member 8 is provided. The blade body 5 is detachably fixed to the blade body mounting rotary member 8 by screwing a female screw portion 18 provided on the upper portion of the blade body 5.
Further, in the blade body 5, at least one circumferential groove 20 is formed on the inner peripheral surface along the circumferential direction on the retreat side from the blade portion 19 at the tip. In this example, the three circumferential grooves 20 are formed at predetermined intervals in the axial direction. However, the present invention is not limited to this, and the circumferential grooves 20 may be spiral.
The blade body 5 has a small-diameter portion 5 a whose outer periphery on the receding side is smaller than the outer diameter of the blade portion 19 from the dimension from the tip of the blade portion 19 to the position where the blade portion 19 passes through the tube wall of the synthetic resin tube 2. It has become.

Next, the drilling of the synthetic resin tube 2 by the drilling blade 1 according to the present invention will be described.
Perforation of the synthetic resin tube 2 by the perforating blade 1 is performed by using a cylindrical female threaded support member 3 provided with a female threaded portion 21 on the inner circumference attached to the outer circumference of the synthetic resin pipe 2 and a female threaded support member 3 on the outer circumference. A drilling machine 23 having an operating shaft 4 that is provided with a male threaded portion 22 that is screwed into the female threaded portion 21 and that moves forward and backward in the axial direction when rotated is used.

In this example, the female threaded support member 3 is attached to the outer periphery of the synthetic resin tube 2 via a water faucet 24 attached to the drilling position of the synthetic resin tube 2. Specifically, the water faucet 24 includes a clamp portion 25 and a cylindrical plug portion 26. The cylindrical plug portion 26 has a through hole 27 inside, and the through hole 27 coincides with the drilling position of the synthetic resin tube 2. The cylindrical plug portion 26 is provided with a plug 28 that opens and closes the through hole 27. Further, a male screw portion 29 is provided at a side end portion on the opposite side of the synthetic resin tube 2 in the cylindrical plug portion 26.
A female screw portion 30 that is screwed into a male screw portion 29 provided in the cylindrical plug portion 26 is provided on the distal end side of the female screw supporting member 3 constituting the punching machine 23, and the female screw portion 30 is screwed into the male screw portion 29. By doing so, the supporting member 3 with an internal thread is attached to the cylindrical plug part 26.

  In this way, the female threaded support member 3 is attached to the cylindrical plug portion 26, and the drilling blade 1 is rotatably attached to the tip of the operation shaft 4 screwed into the female threaded support member 3. In this example, an internal thread portion 31 is provided at the tip of the operation shaft 4, and an external thread portion 32 is provided in the attachment portion 10 of the operation shaft attachment member 7 that is a part of the configuration of the adapter 6 in the drilling blade 1. The drilling blade 1 is rotatably attached to the tip of the operation shaft 4 by screwing the male screw part 32 to the part 31 (see FIG. 5). The mounting portion 10 of the operation shaft mounting member 7 which is a part of the configuration of the adapter 6 in the blade 1 may be provided with a female thread portion that is screwed into the male thread portion at the tip of the operation shaft 4.

  The operating shaft 4 screwed into the female threaded support member 3 and having the drilling blade 1 attached to the tip thereof is rotated by operating the handle 33 to cross the female threaded support member 3 in the axial direction, that is, the synthetic resin tube 2. The drilling blade 1 moves in and out of the through hole 27 of the cylindrical plug portion 26 as the operation shaft 4 advances and retreats.

  At the time of drilling, when the operation shaft 4 is rotated and advanced, the tip of the blade portion 19 of the blade body 5 of the drilling blade 1 is pressed against the surface of the synthetic resin tube 2 to perform drilling. At this time, the blade body 5 of the drilling blade 1 receives a frictional resistance in the rotational direction by the synthetic resin tube 2, but the blade body 5 is a support shaft portion 11 of the operation shaft mounting member main body 9 which is a part of the configuration of the adapter 6. Since the blade body 5 does not rotate even when the adapter 6 rotates, only the thrust is applied to the blade body 5 and the blade portion 19 is moved. It is pressed against the surface of the synthetic resin tube 2 and drilled by pressing.

  At this time, the blade body 5 is formed with at least one circumferential groove 20 along the circumferential direction on the inner circumferential surface on the receding side from the blade portion 19, so that the tube wall of the synthetic resin tube 2 by the blade body 5 is formed. The slice 2a cut by drilling and entered into the cylindrical blade body 5 in a compressed state is restored at the portion of the circumferential groove 20 and engaged with the circumferential groove 20, which is cut and cut into the blade body. It is possible to prevent the resin piece 2 a entering the inside 5 from falling off the blade body 5.

  The blade body 5 has a small-diameter portion 5 a whose outer periphery on the receding side is smaller than the outer diameter of the blade portion 19 from the dimension from the tip of the blade portion 19 to the position where the blade portion 19 passes through the tube wall of the synthetic resin tube 2. Therefore, the frictional resistance applied to the blade body 5 is reduced shortly after the blade portion 19 passes through the tube wall of the synthetic resin tube 2, and the force applied to the rotation of the operation shaft 4 becomes lighter. Thus, it can be confirmed that the blade portion 19 has passed through the tube wall of the synthetic resin tube 2, that is, that the drilling of the synthetic resin tube 2 has been completed.

  When the synthetic resin pipe 2 is pulled up after being drilled, the operation shaft 4 is rotated in the reverse direction and retracted. However, the blade body 5 does not rotate even when the operation shaft 4 rotates. The friction resistance of the resin of the synthetic resin tube 2 that is in close contact with the shaft is small, and the rotational torque of the operation shaft 4 can be small.

  Further, the blade body attaching / rotating member 8 in which the blade body 5 is screwed to the outer periphery is supported by the outer flange 12 provided at the lower portion of the support shaft portion 11 in the operation shaft attaching member main body 9, so that sufficient machinery is provided. The blade body attaching / rotating member 8 is detached from the support shaft portion 11 due to the frictional resistance of the resin of the synthetic resin tube 2 that is in close contact with the blade body 5 when the blade body is pulled up after the drilling. The situation where the body 5 remains in the synthetic resin tube 2 can be prevented.

FIG. 7 is a longitudinal sectional view showing a second example of the embodiment of the drilling blade according to the present invention.
The punching blade of this example is not different from the first example in its basic configuration, and the same configuration as in the first example will be described with the same reference numerals.

  As in the first example, the drilling blade 1 of this example is screwed into a support member 3 with a female thread attached to the outer periphery of the synthetic resin tube 2 and rotates to advance and retract in a direction intersecting the synthetic resin tube 2. It has a cylindrical blade body 5 that is rotatably attached to the tip of the operation shaft 4 and pierces the tube wall of the synthetic resin tube 2. The blade body 5 and the blade body 5 are provided with the blade body 5. It is comprised with the adapter 6 attached to the front-end | tip of the operation shaft 4 rotatably.

As in the first example, the operation shaft attachment member 7 is provided with an attachment portion 10 attached to the female threaded support member 3 on one end side in the axial direction of the operation shaft attachment member main body 9, and on the other end side. A support shaft portion 11 that is smaller in diameter than the operation shaft mounting member main body 9 and rotatably supports the blade body mounting rotation member 8 is provided on the same axis, but in this example, the support shaft portion 11 is operated The shaft mounting member main body 9 is configured separately.
An internal thread portion 34 is provided on the same axis on the other end side of the operation shaft mounting member main body 9, and an external thread portion 35 that is screwed into the internal thread portion 34 is provided on the upper portion of the support shaft portion 11. 11 is screwed and fixed to the female thread portion 34 of the operation shaft mounting member main body 9. The internal thread portion 34 provided on the other end side of the operation shaft mounting member body 9 and the external thread portion 35 provided on the upper portion of the support shaft portion 11 are prevented from loosening with the internal thread portion 34 and the external thread portion 35 to be screwed together. A set screw 15 is provided to prevent rotation. Further, an outer casing 12 that integrally supports the blade body attaching rotary member 8 fitted to the outer periphery of the support shaft portion 11 is integrally provided at the lower portion of the support shaft portion 11.
Since the other configuration is the same as that of the first example, the description of the first example is cited.

According to the drilling blade 1 of the second example configured as described above, the blade attachment rotating member 8 in this example is supported from the upper side of the support shaft 11 by the blade attachment rotation member 8 of the support shaft 11. The blade body attaching rotary member 8 can be easily supported by engaging the outer periphery and fixing the male screw portion 35 on the upper portion of the support shaft portion 11 to the female screw portion 34 of the operation shaft attachment member main body 9. 11 can be rotatably supported on the outer periphery of 11.
Since the other effects are the same as those of the first example, the description of the first example is cited. .

FIG. 8 is a longitudinal sectional view showing a third example of the embodiment of the drilling blade according to the present invention.
The punching blade of this example is the same as the first and second examples and the basic configuration thereof, and the same configurations as those of the first and second examples will be described with the same reference numerals.

  As in the first example, the drilling blade 1 of this example is screwed into a support member 3 with a female thread attached to the outer periphery of the synthetic resin tube 2 and rotates to advance and retract in a direction intersecting the synthetic resin tube 2. It has a cylindrical blade body 5 that is rotatably attached to the tip of the operation shaft 4 and pierces the tube wall of the synthetic resin tube 2. The blade body 5 and the blade body 5 are provided with the blade body 5. It is comprised with the adapter 6 attached to the front-end | tip of the operation shaft 4 rotatably.

  As in the first example, the operation shaft attachment member 7 is provided with an attachment portion 10 attached to the female threaded support member 3 on one end side in the axial direction of the operation shaft attachment member main body 9, and on the other end side. A support shaft portion 11 that is smaller in diameter than the operation shaft attachment member main body 9 and rotatably supports the blade body attachment rotation member 8 is provided on the same axis, but in this example, as in the second example, The support shaft portion 11 is configured separately from the operation shaft mounting member main body 9.

Further, in this example, similarly to the first example, the support shaft portion 11 and the outer flange 12 are configured separately, and a male screw portion 13 is provided on the outer periphery of the lower portion of the support shaft portion 11, and the outer screw 12 has a female screw portion. 14 is provided, and the outer collar 12 is detachably screwed to the support shaft portion 11.
Since the other configuration is the same as that of the first example, the description of the first example is cited.

According to the drilling blade 1 of the third example configured as described above, the blade attachment rotating member 8 in this example is supported by using the male screw portion 35 at the upper portion of the support shaft portion 11 as the female screw of the operation shaft attaching member main body 9. The blade attachment rotating member 8 is fitted to the outer periphery of the support shaft 11 from the lower side of the support shaft 11 fixed to the operation shaft attachment member main body 9 by screwing to the portion 34, and the support shaft 11 The blade attachment rotating member 8 can be firmly supported on the outer periphery of the support shaft 11 by screwing the outer casing 12 onto the lower outer periphery of the support shaft 11.
Since the other effects are the same as those of the first example, the description of the first example is cited. .

DESCRIPTION OF SYMBOLS 1 Perforated blade 2 Synthetic resin tube 2a Section 3 Support member with internal thread 4 Operation shaft 5 Blade body 5a Small diameter part 6 Adapter 7 Operation shaft attachment member 8 Blade body attachment rotation member 9 Operation shaft attachment member main body 10 Attachment part 11 Support shaft part 12 Outer cage 13 Male thread 14 Female thread 15 Set screw 16 Friction reducing member 17 Male thread 18 Female thread 19 Blade 20 Circumferential groove 21 Female thread 22 Male thread 23 Punching machine 24 Water faucet 25 Clamp part 26 Cylindrical plug part 27 Through hole 28 Plug 29 Male thread part 30 Female thread part 31 Female thread part 32 Male thread part 33 Handle 34 Female thread part 35 Male thread part

Claims (7)

It is screwed into a female threaded support member attached to the outer periphery of the synthetic resin pipe, and is attached to the tip of an operation shaft that rotates and advances and retracts in a direction crossing the synthetic resin pipe, and the pipe wall of the synthetic resin pipe A perforating blade for perforating,
A cylindrical blade body and an adapter for attaching the blade body to the tip of the operation shaft are provided, and the adapter is detachably attached to the tip of the operation shaft, and the operation shaft attachment member And is configured to be supported by a blade body attaching rotation member for attaching the blade body,
The operation shaft attachment member is provided with an attachment portion attached to the female threaded support member on one end side in the axial direction of the operation shaft attachment member main body, and formed on the other end side with a smaller diameter than the operation shaft attachment member main body. A support shaft portion that rotatably supports the blade body mounting rotation member is provided on the same axis, and a lower shell of the support shaft portion is provided with an outer casing.
Further, the blade body mounting rotating member is formed of a cylindrical body having an outer diameter at the upper portion larger than the outer diameter of the outer casing, and is fitted to the outer periphery of the support shaft portion, and both ends thereof are mounted on the operation shaft. It is rotatably supported through a friction reducing member between the member main body and the outer casing,
A perforating blade, wherein an upper portion of the blade body is screwed onto an outer periphery of the blade body attaching rotary member.   The outer casing provided at the lower portion of the support shaft portion is configured separately from the support shaft portion, and is detachably screwed to the outer periphery of the lower portion of the support shaft portion. The drilling blade as described. The support shaft provided on the other end side in the axial direction of the operation shaft mounting member main body is configured separately from the operation shaft mounting member main body,
A female screw portion is provided on the same axis on the other end side of the operation shaft mounting member main body, and a male screw portion that is screwed to the female screw portion is provided at an upper portion of the support shaft portion, and the support shaft portion is provided with the operation shaft. The perforating blade according to claim 1, wherein the perforating blade is fixed by being screwed into a female thread portion of the shaft mounting member main body.   The perforation blade according to claim 3, wherein an outer casing provided at a lower portion of the support shaft portion is formed integrally with the support shaft portion.   The outer casing provided at the lower portion of the support shaft portion is configured separately from the support shaft portion, and is detachably screwed to the outer periphery of the lower portion of the support shaft portion. The drilling blade as described.   6. The blade according to claim 1, wherein at least one circumferential groove is formed along the circumferential direction on the inner peripheral surface on the receding side from the blade portion formed at the tip. The drilling blade according to 1.   2. The outer periphery on the receding side of the blade body is formed to have a smaller diameter than the dimension from the tip of the blade portion to the position where the blade portion passes through the tube wall of the synthetic resin pipe. 6. The drilling blade according to any one of 6 above.

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