JP4114829B2 - Hole saw device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hole saw device that opens a through hole in a fluid pipe such as a synthetic resin pipe or a metal pipe, and can discharge a section accommodated therein.
[0002]
[Prior art]
When removing a branch pipe from a piping line that transports fluid such as water or gas, the flow of the fluid in the pipe is not interrupted, that is, the wall surface of the main pipe is taken out from the main pipe while water or gas is supplied. A technique for perforating a metal with a hole saw is known. The hole saw is not limited to this method, and the hole saw has a cylindrical shape, and various blades are formed on the periphery of the opening, and the fluid pipe is perforated by being pushed in the axial direction with rotation or without rotation. Is.
[0003]
[Problems to be solved by the invention]
In this type of hole saw, a section obtained by cutting a wall surface of a fluid pipe generated when drilling is accommodated in the hole saw and collected.
[0004]
To remove the slices contained in the hole saw, insert a screwdriver or a suitable thin plate from the hole saw opening direction, or insert a screwdriver or the like from a hole drilled in the peripheral wall of the hole saw. It was. The work to pry out the section required a certain level of skill because the section was tilted and the gap for inserting a screwdriver or the like was narrow. In addition, there was a problem that it was easy to be injured by the cutting blade during the work.
[0005]
The problem to be solved by the present invention is to solve the above-mentioned problems, and is to provide a hole saw device that can easily discharge a section in a perforation of a fluid pipe to the outside of the hole saw.
[0006]
[Means for Solving the Problems]
The hole saw device of the present invention is a cylindrical hole saw that is detachably fixed to a spindle of a drilling machine and has a cutting edge formed on the periphery of the opening.
A case body attached to the drilling machine, containing the hole saw, and having a closed surface facing the bottom surface of the hole saw;
A section abutting member disposed so as to be relatively movable in the axial direction inside the hole saw;
Is secured to the sections abutting member, the end portion penetrates the bottom surface of the hole saw, in contact with the closing surface of the case body by pulling back the spindle after drilling completion, the relative movement of the sections abutting member with respect to the hole saw And an extruding member that stops the operation.
Due to this feature, when the spindle is moved backward after the drilling operation is completed and the hole saw is pulled back to the drilling machine, the section abutting member is pulled back together with the hole saw in the initial stage, and the end of the extrusion member is the case body. The section abutting member fixed to the pushing member stops moving, and the section abutting member relatively moves toward the opening end inside the hole saw. Therefore, the section cut by drilling and accommodated in the hole saw is pushed out by the section abutting member and easily discharged out 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.
[0007]
The section contact member is preferably a circular plate having an outer diameter substantially equal to the inner diameter of the hole saw.
By doing so, the section contact member is arranged inside the hole saw without any gap, so that the section contact member can be contacted regardless of the direction in which the section is inclined inside the hole saw, and the section is reliably discharged. can do.
[0008]
It is preferable that the section abutting member is provided with a plurality of the pushing members.
By doing in this way, when the extruding member abuts against the closing surface, the section abutting member fixed to the extruding member does not tilt inside the hole saw, and the section abutting member is in the axial direction of the hole saw. Since it can move in parallel, the section can be reliably discharged.
[0009]
The section abutting member is preferably formed in a substantially cylindrical shape so as to prevent deformation of the hole saw by contacting the inner surface of the hole saw when it is bent.
By doing so, when the hole saw starts to bend during the drilling of the tubular body, the cylindrical section contact member comes into contact with the inner surface of the hole saw and suppresses the deflection. Therefore, the hole saw is not deformed and is not damaged.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
1 to 3 show a first embodiment in which a polyethylene fluid pipe P is perforated using the hole saw device 1 of the present invention. In the figure, 2 is a hole saw body, 3 is a section abutting member, 4 is a pushing member that supports and extrudes the section abutting member 3, 5 is a connecting bolt that connects the section abutting member 3 to the hole saw main body 2, and 6 is a force that urges the section abutting member 3 toward the cutting edge 2 a of the hole saw main body 2. A coil spring 7, a spindle of a drilling machine (not shown), 8 a fixing bolt for fastening the hole saw body 2 to the spindle 7, and 9 a case body which is attached to the tip of the drilling machine and accommodates the hole saw body 2. Yes.
[0012]
The hole saw body 2 has a cylindrical shape provided with an open end on one side and closed by a bottom surface 2b on the other side, a tapered cutting edge 2a is formed at the open end, and the bottom surface 2b has an outer side at the center. A boss 2c projecting toward is provided. The bottom surface 2b has an opening 2d into which the connecting bolt 5 cannot be rotated and is slidable in the axial direction at the center of the boss 2c, and four fixing bolts 8 are screwed into concentric circles outside the boss 2c. Four through holes 2f through which the pushing member 4 passes are provided on the female screw portion 2e and a concentric circle on the outer side thereof.
[0013]
The section abutting member 3 is formed in a circular shape having an outer diameter substantially the same as the inner diameter of the hole saw body 2 and is mounted inside the hole saw body 2, and a flat surface portion 3 a is provided on the bottom surface 2 b side, and the cutting blade 2 a side is provided. Is formed with an arcuate portion 3b substantially the same as the outer diameter of the fluid pipe P.
[0014]
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 circles. Yes.
[0015]
A section abutting member 3 into which the central connecting bolt 5 and the four extruding members 4 around it are screwed is externally fitted to the connecting bolt 5 and between the inside of the opening 2d of the hole saw body 2 and the flat surface portion 3a. The coil spring 6 is compressed in the direction of the cutting edge 2a and is mounted in the hole saw body 2 in a non-rotatable and slidable state. I saw body 2 which intercept contact member 3 is mounted is fastened to the fixing seat 7a of the end of the spindle 7 in fixing bolts 8.
[0016]
The case body 9 accommodates the hole saw body 2 and is attached to the tip of the drilling machine. A closing surface 9a is formed on the drilling machine side, the spindle 7 passes through the center, and the other is described later. A flange portion 9b fixed to the gate valve device 12 is provided.
[0017]
In order to perforate 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 sideways on one side of the fluid pipe P is made watertight via a packing 11. Installing. The flange of the branch pipe portion 10a is bolted to the left flange of the gate valve device 12 having a valve body that is lifted and lowered by a screw rod (not shown).
[0018]
Next, a punching 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 the hole saw body 2 is accommodated therein is attached. The hole saw device 1 is attached to the end of the spindle 7 of the drilling machine in the state described above.
[0019]
The punching machine uses a machine that only advances and retreats without rotating the hole saw device 1.
[0020]
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 further punched by pressing.
[0021]
When the cutting blade 2a moves in the direction of the tube center axis and punctures, the section abutting member 3 does not come into contact with the fluid pipe P because the arcuate portion 3b is formed, and the punching machine of the coil spring 6 is used. No resistance to pressing force is generated.
[0022]
When the drilling progresses, the direction perpendicular to the tube axis of the cutting edge 2a contacts the outer peripheral surface of the fluid tube P, and when the cutting of the portion starts, the section contact member 3 stays in place and the coil spring 6 is compressed and only the hole saw body 2 is compressed. Will go on.
[0023]
When the cutting edge 2a of the hole saw body 2 penetrates the fluid pipe P, the drilling is finished, and the section 13 cut out from the fluid pipe P is accommodated in the hole saw body 2.
[0024]
While drilling, the hole saw body 2 bends and tends to deform into an elliptical shape that is long 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 deformation is prevented. Therefore, the hole saw body 2 is not damaged.
[0025]
When the drilling is completed and the spindle 7 is pulled back, the hole saw body 2 is returned to the inside of the case body 9 and accommodated.
[0026]
At this time, as shown in FIG. 4A, the section 13 is accommodated in the hole saw body 2 and is pulled back together with the section abutting member 3 to the perforator. The pushing member 4 extends toward the punching machine from a through hole 2f formed in the bottom surface 2b of the hole saw body 2.
[0027]
Next, as shown in FIG. 4B, when the end of the pushing member 4 that has moved to the punching machine comes into contact with the closing surface 9 a of the case body 9, the section abutting member fixed to the pushing member 4. The movement of 3 stops. Since the hole saw body 2 is further moved to the perforator by the spindle 7, the section contact member 3 is relatively moved to the opening end side inside the hole saw body 2 (FIG. 4C). Therefore, the slice 13 cut out by drilling and accommodated in the inside of the hole saw body 2 is easily pushed out by the section abutting member 3 by a normal operation process of pulling the hole saw body 2 back to the drilling machine after the drilling is completed. It is discharged outside the hole saw body 2.
[0028]
5 and 6 show a second embodiment of the hole saw device 1 according to the present invention, in which 2 is a hole saw body, 3 is a section abutting member, and 4 is a section abutting member 3 which is supported and pushed out. Extruding member, 7 is a spindle of a drilling machine not shown, 8 is a fixing bolt for fastening the hole saw body 2 to the spindle 7, and 9 is a case body that is attached to the tip of the drilling machine and accommodates the hole saw body 2 Yes.
[0029]
The hole saw body 2 has a cylindrical shape provided with an opening end on one side and closed by a bottom surface 2b on the other side, and a tapered cutting edge 2a is formed at the opening end. The bottom surface 2b is provided with four female screw portions 2e into which the fixing bolts 8 are screwed on concentric circles, and two through holes 2f through which the pushing member 4 passes.
[0030]
The section abutting member 3 has a substantially rectangular shape formed so that arc-shaped portions 3f having substantially the same curvature as the inner diameter of the hole saw body 2 are in contact with the inner peripheral surface of the hole saw body 2 at two positions perpendicular to the tube axis. Yes. The section contact member 3 is provided with two female screw portions 3d into which the pushing member 4 is screwed.
[0031]
The pushing member 4 has a male screw portion 4a that is screwed into the female screw portion 3d of the section contact member 3 on one side, and a groove portion that attaches a C ring 4c that prevents the section contact member 3 from falling from the hole saw body 2 on the other side. 4b is formed.
[0032]
The section abutting member 3 into which the two extruding members 4 are screwed is mounted inside the hole saw body 2 in a non-rotatable and slidable state, and the groove 4b of the extruding member 4 protrudes from the bottom surface 2b of the hole saw body 2. The C-ring 4c is fitted to. The hole saw body 2 in which the section abutting member 3 is mounted is fastened with a fixing bolt 8 to a fixed seat 7 a at the end of the spindle 7.
[0033]
The case body 9 accommodates the hole saw body 2 and is attached to the tip of the drilling machine. A closed surface 9a is formed on the drilling machine side, the spindle 7 passes through the center, and the other is described later. A flange portion 9b fixed to the gate valve device 12 is provided.
[0034]
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.
[0035]
The section 13 cut out from the fluid pipe P is accommodated in the hole saw body 2 when the drilling is completed, and when the drilling is completed and the spindle 7 is pulled back, the hole saw body 2 is returned and accommodated in the case body 9. .
[0036]
The movement of discharging the section is the same as in the first embodiment. First, the section 13 is accommodated in the hole saw body 2, and the section abutting member 3 and the hole saw body are pulled back together to the perforator. At this time, the pushing member 4 protrudes toward the punching machine from the through hole 2f formed in the bottom surface 2b of the hole saw body 2.
[0037]
Next, when the end portion of the pushing member 4 that has moved to the punching machine comes into contact with the closing surface 9a of the case body 9, the movement of the section abutting member 3 fixed to the pushing member 4 stops. Since the hole saw body 2 is further moved to the punching machine side by the spindle 7, the section abutting member 3 is relatively moved to the opening end side inside the hole saw body 2.
[0038]
Therefore, the slice 13 cut out by drilling and accommodated in the inside of the hole saw body 2 is easily pushed out by the section abutting member 3 by a normal operation process of pulling the hole saw body 2 back to the drilling machine after the drilling is completed. It is discharged outside the hole saw body 2.
[0039]
The present invention is not limited to the above embodiments.
[0040]
In the embodiment, the extruding member is fixed to the section abutting member. However, the extruding member is fixed to the closing surface of the case body and inserted into the through hole in the bottom surface of the hole saw body to push out the section abutting member. Good.
[0041]
In order to prevent the section abutting member from tilting inside the hole saw body, the end of the section abutting member may be thickened or a rib may be provided.
[0042]
In order to prevent the section abutting member from falling in the second embodiment, a C-ring is provided at the end of the pushing member, but a split pin, a bolt, or the like may be provided.
[0043]
【The invention's effect】
According to the present invention, when the spindle is moved backward after the drilling operation is finished and the hole saw is pulled back to the drilling machine side, the section abutting member is initially pulled back together with the hole saw, and the end of the extrusion member is By abutting against the closed surface of the case body, the movement of the segment abutting member fixed to the pushing member stops, and the segment abutting member relatively moves toward the opening end in the hole saw. Therefore, the section cut by drilling and accommodated in the hole saw is pushed out by the section abutting member and easily discharged out 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.
[0044]
According to the invention of claim 2, since the section abutting member is arranged in the hole saw with almost no gap, the section abutting member can be abutted regardless of which direction the section is inclined inside the hole saw. Can be reliably discharged.
[0045]
According to the invention of claim 3, when the extruding member abuts against the closing surface, the section abutting member fixed to the extruding member does not tilt inside the hole saw. Since it can move evenly in the axial direction, the section can be reliably discharged.
[0046]
According to the fourth aspect of the present invention, when the hole saw begins to bend when the tubular body is drilled, the cylindrical section contact member comes into contact with the inner surface of the hole saw and suppresses the deflection. Therefore, the hole saw is not deformed and is not damaged.
[0047]
[Brief description of the drawings]
FIG. 1 is a cross-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 diagram 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 edge 2b Bottom face 2c Boss 2d Opening part 2e Female thread part 2f Through-hole 2g Fixing seat 3 Section contact member 3a Plane part 3b Arc-shaped part 3c Female thread part 3d Female thread part 3e Through-hole 3f Arc-shaped part 4 Extruding member 4a Male thread portion 4b Groove portion 4c C ring 5 Connection 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 Gate valve device 13 Section

Claims (4)

A cylindrical hole saw that is detachably fixed to a spindle of a drilling machine and has a cutting edge formed at the periphery of the opening,
A case body attached to the drilling machine, containing the hole saw, and having a closed surface facing the bottom surface of the hole saw;
A section abutting member disposed so as to be relatively movable in the axial direction inside the hole saw;
Is secured to the sections abutting member, the end portion penetrates the bottom surface of the hole saw, in contact with the closing surface of the case body by pulling back the spindle after drilling completion, the relative movement of the sections abutting member with respect to the hole saw A hole saw device comprising: an extruding member that stops the operation .   The hole saw device according to claim 1, wherein the section contact member is a circular plate having an outer diameter substantially equal to an inner diameter of the hole saw.   The hole saw device according to claim 1, wherein the section abutting member is provided with a plurality of the extruding members.   The hole saw device according to claim 2 or 3, wherein the section abutting member is formed in a substantially cylindrical shape so as to prevent deformation of the hole saw by contacting the inner surface of the hole saw when it is bent.

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