JP2000024818A - Hole saw device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily discharge a cutting chips in boring a fluid pipe to the outside of a hole saw. SOLUTION: When a spindle is moved backward to pull a hole saw back to the boring machine side after the completion of boring work, a cutting chip abutting member 3 is pulled back together with the hole saw in an initial stage, and the end of a push-out member abuts a closed face 9a of a case body 9 to stop the motion of the cutting chip abutting member 3 fixed to the push-out member 4. As a result, the cutting chip abutting member 3 relatively moves onto the opening end side inside the hole saw. A cutting chip 13 cut off by boring and stored inside the hole saw is therefore pushed out by the cutting chip abutting member 3 and easily discharged to the outside of the hole saw by a normal work process of pulling the hole saw back to the boring machine side after the completion of boring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole saw for opening a through-hole in a fluid pipe such as a synthetic resin pipe or a metal pipe, and to a hole saw apparatus capable of discharging pieces stored therein.

[0002]

2. Description of the Related Art When taking out a branch pipe from a piping line for transporting a fluid such as water or gas, a state in which the flow of fluid in the pipe is not interrupted, that is, to take out the branch pipe from the main pipe while supplying water or gas. A technique for piercing the wall surface of a main pipe with a hole saw is known. Not limited to this method, the hole saw is cylindrical, and various blades are formed on the periphery of the opening, and drills the fluid pipe by digging while applying rotation or pressing in the axial direction without rotation. Things.

[0003]

In a hole saw of this type, a cut-out section of a wall surface of a fluid pipe generated at the time of piercing is collected and stored inside the hole saw.

[0004] In order to take out the section housed in the hole saw, a driver or a suitable thin plate is inserted from the opening direction of the hole saw, or a driver or the like is inserted from a hole formed in a peripheral wall of the hole saw. I was prying out. The work of prying out the sections requires some skill and also requires a considerable amount of work time, because the sections are inclined and the gap for inserting a driver or the like is narrow. In addition, there is also a problem that injuries are easily caused by the cutting blade during the operation.

An object of the present invention is to solve the above-mentioned problem, and to provide a hole saw device which can easily discharge a section in a hole of a fluid pipe to the outside of a hole saw. is there.

[0006]

A hole saw device according to the present invention is a cylindrical hole saw having a cutting blade formed on a periphery of an opening portion so as to be detachably fixed to a spindle of a drilling machine.
A case body having a closed surface facing the bottom surface of the hole saw, a section contact member disposed so as to be relatively movable in the axial direction inside the hole saw, and fixed to the section contact member,
An extruding member that can extend from the bottom surface of the hole saw to the outside of the drilling machine side. With this feature, when the spindle is moved backward after the drilling operation is completed and the hole saw is returned to the drilling machine side,
Initially, the section contact member is pulled back together with the hole saw, and the end of the extruded member abuts against the closed surface of the case body, so that the movement of the section contact member fixed to the extruded member stops, The section contact member relatively moves toward the open end inside the hole saw. Therefore, the slice cut out by the drilling and housed in the inside of the hole saw is pushed out by the slice contact member and easily discharged to the outside of the hole saw by a normal operation process of pulling the hole saw back to the drilling machine after the drilling is completed. be able to.

Preferably, the section contact member is a circular plate having an outer diameter substantially equal to the inner diameter of the hole saw. By doing so, the section abutment member is arranged without a gap inside the hole saw, so that the section abutment member can abut in any direction inside the hole saw, and the section is reliably discharged. can do.

[0008] In the section contact member, the pushing member includes:
It is preferable that a plurality of these are provided symmetrically. With this configuration, when the pushing member comes into contact with the closing surface, the section contact member fixed to the pushing member does not tilt inside the hole saw, and the section contact member moves in the axial direction of the hole saw. Since the sections can be moved in parallel, the sections can be reliably discharged.

Preferably, the section contact member is formed in a substantially columnar shape so as to prevent deformation of the hole saw by contacting the inner surface of the hole saw when the hole saw is bent. In this way, when the hole saw begins to bend when the tube is pierced, the column-shaped section contact member comes into contact with the inner surface of the hole saw to suppress the deflection. Therefore, the hole saw is not deformed nor damaged.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first example of drilling a fluid pipe P made of polyethylene using a hole saw device 1 of the present invention.
In the figure, 2 is a hole saw main body, 3 is a section contact member, 4 is an extruding member that supports and pushes out the section contact member 3, and 5 is a section contact member 3 connected to the hole saw body 2. A coupling spring 6 for urging the section contact member 3 in the direction of the cutting blade 2a of the hole saw body 2;
Denotes a spindle of the drilling machine (not shown), 8 denotes a fixing bolt for fastening the hole saw main body 2 to the spindle 7, and 9 denotes a case body attached to the tip of the drilling machine and housing the hole saw main body 2.

The hole saw body 2 has a cylindrical shape closed at one end with an open end and at the other end with a bottom surface 2b, and has a tapered cutting edge 2a formed at the open end. Boss 2 projecting outward at the center
c is provided. The bottom surface 2b has an opening 2d into which the connecting bolt 5 is inserted in the center of the boss 2c so as to be non-rotatable and slidable in the axial direction, and four fixing bolts 8 into which the fixing bolt 8 is screwed on a concentric circle outside the boss 2c. The female screw portion 2e and four concentric holes outside the female screw portion 2e are provided with four through holes 2f through which the pushing member 4 penetrates.

The section contact member 3 is formed in a circular shape having an outer diameter substantially equal to the inner diameter of the hole saw main body 2 and is mounted inside the hole saw main body 2, and the bottom surface 2b side is a flat portion 3a.
And an arc-shaped portion 3b substantially the same as the outer diameter of the fluid pipe P is formed on the cutting blade 2a side.

A female screw portion 3c into which the connecting bolt 5 is screwed is provided at the center of the section contact member 3, and four female screw portions 3d into which the pushing member 4 is screwed are provided on the outer concentric circle. Is provided.

The section contact member 3 into which the center connecting bolt 5 and the four pushing members 4 around it are screwed is fitted onto the connecting bolt 5 and the inside of the opening 2d of the hole saw body 2 and the flat portion 3a. And is urged in the direction of the cutting blade 2a by the coil spring 6 compressed between the main body 2 and the hole saw main body 2 in a non-rotatable and slidable state. The hole saw main body 2 on which the section isolating member 3 is mounted is a spindle 7
Are fixed with fixing bolts 8 to the fixing seat 7a at the end.

The case body 9 has a hole saw body 2 inside.
Is housed and attached to the tip of the drilling machine. A closing surface 9a is formed on the side of the drilling machine, and the spindle 7 penetrates the center of the closing surface 9a. The other side has a flange portion fixed to a gate valve device 12 described later. 9b is provided.

In order to pierce the fluid pipe P with the hole saw device 1 of the present invention, first, a half joint 10 having a branch pipe portion 10a facing one side at a predetermined position of the fluid pipe P is inserted through a packing 11. Water tight. A left flange of the gate valve device 12 having a valve body that is moved up and down by a screw rod (not shown) is bolted to the flange of the branch pipe portion 10a.

Next, a piercing machine (not shown) in which a case body 9 is provided at the tip of the right flange of the gate valve device 12 and in which the hole saw body 2 is accommodated is mounted. The hole saw device 1 is attached to the end of the spindle 7 of the drilling machine in the state described above.

As the drilling machine, one that only moves forward and backward without rotating the hole saw device 1 is used.

Next, the spindle 7 of the drilling machine is sent out, the cutting blade 2a of the hole saw device 1 is brought into contact with the outer peripheral surface of the fluid pipe P, and the drilling is performed by further pressing.

When the cutting blade 2a moves in the direction of the center axis of the pipe and is pierced, the section contact member 3 does not come into contact with the fluid pipe P because the arc-shaped part 3b is formed. There is no resistance to the pressing force of the drilling machine.

As the drilling proceeds, the direction perpendicular to the pipe axis of the cutting blade 2a abuts on the outer peripheral surface of the fluid pipe P, and when the cutting of that part starts, the section abutting member 3 stays in place and the coil spring 6 is compressed and the hole saw Only the main body 2 will advance.

When the cutting blade 2a of the hole saw main body 2 penetrates the fluid pipe P, the drilling is completed, and the section 13 cut from the fluid pipe P is stored in the hole saw main body 2.

During drilling, the hole saw body 2 bends and tends to be deformed into an elliptical shape elongated in the tube axis direction. However, since the section contact member 3 is provided so as to contact the inner surface, the deflection is controlled, and the deformation is prevented. Since it is prevented, the hole saw main body 2 is not damaged.

When drilling is completed and the spindle 7 is pulled back,
The hole saw main body 2 is returned and housed inside the case body 9.

At this time, as shown in FIG. 4A, the section 13 is housed inside the hole saw main body 2 and is pulled back to the drilling machine together with the section contact member 3. The pushing member 4 extends from the through hole 2f formed in the bottom surface 2b of the hole saw main body 2 to the drilling machine side.

Next, as shown in FIG. 4 (b), when the end of the pushing member 4 which has moved to the drilling machine comes into contact with the closing surface 9a of the case body 9, the section fixed to the pushing member 4 is formed. The movement of the contact member 3 stops. Since the hole saw main body 2 is further moved to the drilling machine side by the spindle 7, the section contact member 3 relatively moves to the opening end side inside the hole saw main body 2 (FIG. 4C). Therefore, the slice 13 cut out by the drilling and accommodated in the inside of the hole saw main body 2 is easily pushed out by the slice contact member 3 by a normal operation process of pulling the hole saw main body 2 back to the drilling machine after the completion of the drilling. It is discharged outside the hole saw main body 2.

FIGS. 5 and 6 show a second embodiment of the hole saw apparatus 1 according to the present invention. In FIG. 5, reference numeral 2 denotes a hole saw body, 3 denotes a section contact member, and 4 denotes a section contact member 3.
An extruding member for supporting and extruding, a spindle 7 of a drilling machine (not shown),
A fixing bolt 9 is attached to the tip of the drilling machine to indicate a case body in which the hole saw main body 2 is housed.

The hole saw body 2 has a cylindrical shape closed on one side with an open end and on the other side with a bottom surface 2b, and has a tapered cutting edge 2a formed on the open end. The bottom surface 2b is provided with four female screw portions 2e into which the fixing bolts 8 are screwed concentrically, and two through holes 2f through which the pushing member 4 passes.

The section contact member 3 has a substantially rectangular shape in which an arc-shaped portion 3f having substantially the same curvature as the inner diameter of the hole saw main body 2 contacts the inner peripheral surface of the hole saw main body 2 at two locations in the direction perpendicular to the tube axis. You are. The section contact member 3 is provided with two female threads 3d into which the pushing member 4 is screwed.

The pushing member 4 has a male thread 4a which is screwed into the female thread 3d of the section contact member 3 on one side, and a C-ring 4c for preventing the section contact member 3 from dropping from the hole saw body 2 on the other side. Is formed.

The section contact member 3 into which the two pushing members 4 are screwed is mounted inside the hole saw body 2 in a non-rotatable and slidable manner, and the pushing member 4 protrudes from the bottom surface 2b of the hole saw body 2. The C-ring 4c is fitted in the groove 4b. The hole saw main body 2 in which the section contact member 3 is mounted is fastened to a fixing seat 7 a at the end of the spindle 7 with fixing bolts 8.

The case body 9 has a hole saw body 2 inside.
Is housed and attached to the tip of the drilling machine. A closing surface 9a is formed on the side of the drilling machine, and the spindle 7 penetrates the center of the closing surface 9a. The other side has a flange portion fixed to a gate valve device 12 described later. 9b is provided.

The drilling of the fluid pipe P by the hole saw device 1 of the second embodiment is performed in the same manner as in the first embodiment.

The section 13 cut from the fluid pipe P is stored in the hole saw main body 2 when the drilling is completed. When the drilling is completed and the spindle 7 is pulled back, the hole saw main body 2 is returned to the inside of the case body 9. Will be accommodated.

The operation of discharging the section is the same as that of the first embodiment. First, the section 13 is accommodated in the hole saw main body 2 and the section contact member 3 and the hole saw main body are pulled back together to the drilling machine side. It is. At this time, the pushing member 4 protrudes from the through hole 2f formed in the bottom surface 2b of the hole saw main body 2 toward the drilling machine.

Next, when the end of the extruding member 4 that has moved toward the drilling machine comes into contact with the closing surface 9a of the case body 9, the movement of the segment contact member 3 fixed to the extruding member 4 stops. Since the hole saw main body 2 is further moved to the drilling machine side by the spindle 7, the section contact member 3 relatively moves to the opening end side inside the hole saw main body 2.

Therefore, the cut piece 13 cut out by the perforation and accommodated in the inside of the hole saw main body 2 is pushed out by the cut contact member 3 by a normal work process of pulling the hole saw main body 2 back to the drilling machine after the completion of the perforation. And is easily discharged outside the hole saw main body 2.

The present invention is not limited to the above embodiment.

In the embodiment, the pushing member is fixed to the section contact member. However, the pushing member is fixed to the closed surface of the case body and inserted into the through hole in the bottom surface of the hole saw main body to push out the section contact member. It may be.

In order to prevent the section contact member from tilting inside the hole saw body, the end of the section contact member may be thickened or ribs may be provided.

Although the C-ring is provided at the end of the pushing member to prevent the section contact member from dropping in the second embodiment, a split pin or a bolt may be provided.

[0043]

According to the present invention, when the spindle is moved backward after the drilling operation is completed and the hole saw is returned to the drilling machine side, the section contact member is initially pulled back together with the hole saw, and the extrusion is performed. When the end of the member comes into contact with the closed surface of the case body, the movement of the section contact member fixed to the pushing member stops, and the section contact member relatively moves toward the open end inside the hole saw. Will do. Therefore, the slice cut out by the drilling and housed in the inside of the hole saw is pushed out by the slice contact member and easily discharged to the outside of the hole saw by a normal operation process of pulling the hole saw back to the drilling machine after the drilling is completed. be able to.

According to the second aspect of the present invention, since the section contact member is disposed within the hole saw with almost no gap,
The section contact member can contact the section in any direction inside the hole saw, and the section can be reliably discharged.

According to the third aspect of the present invention, when the pushing member comes into contact with the closing surface, the section contact member fixed to the pushing member does not tilt inside the hole saw. Can be evenly moved in the axial direction of the hole saw, so that the section can be reliably discharged.

According to the fourth aspect of the present invention, when the hole saw starts to bend when the tube is pierced, the cylindrical section contact member comes into contact with the inner surface of the hole saw to suppress the bending. Therefore, the hole saw is not deformed nor damaged.

[0047]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view of the hole saw device.

FIG. 3 is a side view of the hole saw device.

FIG. 4 is also an explanatory view of section discharge.

FIG. 5 is a sectional view of a hole saw device according to a second embodiment of the present invention.

FIG. 6 is a side view of the hole saw device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hole saw apparatus 2 Hole saw main body 2a Cutting blade 2b Bottom surface 2c Boss 2d Opening 2e Female screw part 2f Through hole 2g Fixed seat 3 Section contact member 3a Flat surface part 3b Arc-shaped part 3c Female screw part 3d Female screw part 3e Through hole 3f Arc-shaped part Reference Signs List 4 extrusion member 4a external thread portion 4b groove portion 4c C ring 5 connecting bolt 6 coil spring 7 spindle 7a fixing seat 8 fixing bolt 9 case body 9a closing surface 9b flange 10 half joint 10a branch pipe portion 11 packing 12 partition valve device 13 cut piece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C021 FD08 3C037 AA00 DD00 FF08 3C060 AA04 AA16 AB02 BA01 BA05 BB12 BD01 BG20

Claims (4)

[Claims] 1. A cylindrical hole saw, which is detachably fixed to a spindle of a drilling machine and has a cutting edge formed on an opening peripheral edge, wherein a case body having a closed surface facing a bottom surface of the hole saw, A section abutting member arranged to be relatively movable in the axial direction inside the hole saw, and an extruded member fixed to the section abutting member and capable of extending from the bottom of the hole saw to the outside of the drilling machine side, A hole saw device. 2. The hole saw device according to claim 1, wherein the section contact member is a circular plate having an outer diameter substantially equal to the inner diameter of the hole saw. 3. The hole saw device according to claim 1, wherein a plurality of the pushing members are symmetrically provided on the section contact member. 4. The hole saw device according to claim 2, wherein the section contact member is formed in a substantially columnar shape so as to prevent deformation of the hole saw by contacting an inner surface of the hole saw when the hole saw is bent. .