JP4114827B2 - 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.
[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 cylindrical fluid pipe is drilled from the outside toward the central axis. Therefore, at the initial stage of drilling, the entire circumference of the hole saw is not in contact with the fluid pipe, but only two locations in the pipe axis direction. In contact. Therefore, especially when the hole saw is drilled only by pressing without rotation, as the drilling progresses, the two portions of the hole saw that have been in contact with the hole are expanded and deflected, and the hole saw is long in the tube axis direction of the fluid pipe. It has a problem that it is deformed into an ellipse, and when the deflection reaches its limit, it is broken and cannot be perforated.
[0004]
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 is not deformed and broken when a fluid pipe is drilled.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is a cylindrical tube hole drilling hole in which a tapered cutting edge is formed on the periphery of the opening,
An arcuate portion mounted on the inside of the hole saw and provided so as to be relatively movable in the axial direction with respect to the hole saw, and having an inner diameter of the cutting blade as a string and having substantially the same curvature as the outer peripheral surface of the tubular body, It has a deformation prevention guide formed on the cutting edge side of the hole saw,
The deformation prevention guide is in contact with the inner surface of the hole saw when it is bent, and remains in place when the direction perpendicular to the tube axis of the cutting blade comes into contact with the outer peripheral surface of the tube body .
[0006]
The invention of claim 2 is a cylindrical tube hole drilling hole in which a tapered cutting edge is formed on the periphery of the opening,
Two arcuate portions mounted on the inside of the hole saw and provided so as to be relatively movable in the axial direction with respect to the hole saw and having substantially the same curvature as the inner peripheral surface of the hole saw main body A deformation prevention guide having a substantially rectangular shape formed so as to contact the inner peripheral surface of the hole saw body, wherein the arc-shaped portion protrudes toward the cutting edge with a predetermined width, and the cross section is formed in a U shape. Has
The deformation prevention guide is in contact with the inner surface of the hole saw when it is bent, and remains in place when the direction perpendicular to the tube axis of the cutting blade comes into contact with the outer peripheral surface of the tube body .
[0007]
Because of this feature, a deformation prevention guide is provided to prevent the hole saw from being deformed. Therefore, when the hole saw starts to bend when the tube is drilled, the deformation prevention guide is in contact with the inner surface of the hole saw. Is suppressed and deformation is prevented. Therefore, the hole saw is prevented from being damaged because the deformation amount is minimized, and the fluid pipe can be perforated.
[0008]
Moreover, the deformation prevention guide is provided to be relatively movable in the axial direction with respect to the hole saw, with the efficiency of preventing deformation because it established the deformation prevention guide at effective control of the deflection of the hole saw is improved hole saw An anti-deformation guide can be provided so as not to interfere with the perforation of.
[0010]
In addition, since the deformation prevention guide is provided in a non-contact manner on the outer peripheral surface of the fluid pipe in the initial stage of drilling, the deformation prevention guide is not in contact with the outer peripheral surface of the fluid pipe. Excess resistance is not generated, and the drilling operation can be performed efficiently.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0016]
1 to 3 show a first embodiment in which a hole pipe made of polyethylene is drilled by using the hole saw device 1 of the present invention, in which 2 is a hole saw body, 3 is a deformation prevention guide, Is a support bar that supports the deformation prevention guide 3, 5 is a connecting bolt that connects the deformation prevention guide 3 to the hole saw body 2, 6 is a coil spring that biases the deformation prevention guide 3 in the direction of the cutting edge 2a of the hole saw body 2, and 7 is A drilling machine spindle 8 (not shown) is a fixing bolt for fastening the hole saw body 2 to the spindle 7.
[0017]
The hole saw body 2 has a cylindrical shape provided with an open end on one side and closed by a closed portion 2b on the other side, and a tapered cutting edge 2a is formed at the open end. Is provided with a boss 2c protruding outward. An opening 2d into which the connecting bolt 5 cannot be rotated and is slidable in the axial direction is inserted into the center of the boss 2c, and a fixing bolt 8 is screwed into a concentric circle outside the boss 2c. Four through-holes 2f through which the support bar 4 passes are provided on one female screw portion 2e and on the outer concentric circle.
[0018]
The deformation prevention guide 3 is formed in a circular shape having an outer diameter substantially the same as the inner diameter of the hole saw main body 2 and is mounted inside the hole saw main body 2. The flat portion 3a is provided on the closing portion 2b side, and the cutting blade 2a side is provided. Is formed with an arcuate portion 3b having substantially the same curvature as the outer peripheral surface of the fluid pipe P. A female screw portion 3c into which the connecting bolt 5 is screwed is provided at the center of the deformation prevention guide 3, and four female screw portions 3d into which the support bar 4 is screwed are provided on the outer concentric circle.
[0019]
The deformation prevention guide 3 in which the central connection bolt 5 and the four support bars 4 around it are screwed is externally fitted to the connection bolt 5 and compressed between the inner surface of the closed portion 2b of the hole saw body 2 and the flat portion 3a. The hole saw device 1 mounted inside the hole saw body 2 in a state in which the coil spring 6 is biased in the direction of the cutting edge 2 a and cannot rotate and slide is fixed to a fixing seat 7 a at the end of the spindle 7 with a fixing bolt 8 is concluded.
[0020]
In order to pierce the fluid pipe P with the hole saw device 1 of the present invention, first, a half joint 9 having a branch pipe portion 9a facing sideways on one side of the fluid pipe P is watertight through a packing 10. Installing. The flange of the branch pipe portion 9a is bolted to the left flange of the gate valve device 11 having a valve body that is lifted and lowered by a screw rod (not shown).
[0021]
Next, a punch (not shown) is attached to the right flange of the gate valve device 11. The hole saw device 1 is attached to the end of the spindle 7 of the drilling machine in the state described above. The punching machine uses a machine that only advances and retreats without rotating the hole saw device 1.
[0022]
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.
[0023]
At the initial stage where the cutting edge 2a moves in the direction of the tube center axis and is drilled, the deformation prevention guide 3 is formed with the arc-shaped portion 3b, so that it does not come into contact with the fluid pipe P and is drilled by the coil spring 6. There is no resistance to the pressing force of the machine.
[0024]
When the drilling progresses, the direction perpendicular to the tube axis of the cutting edge 2a comes into contact with the outer peripheral surface of the fluid tube P, and when the portion starts to be cut, the deformation prevention guide 3 stays in place and the coil spring 6 is compressed and only the hole saw body 2 is compressed. Come on.
[0025]
The section cut from the fluid pipe P is accommodated in the hole saw body 2 when the drilling is completed.
[0026]
During drilling, the hole saw body 2 tries to deform into an elliptical shape that is long in the direction of the flexible tube axis. However, since it contacts the inner surface of the deformation prevention guide 3 at least in the direction perpendicular to the axis, the deflection is controlled and the deformation is prevented. The main body 2 is not damaged.
[0027]
4 and 5 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 deformation prevention guide, 6 is a deformation prevention guide 3 and the hole saw body 2 is cut. A coil spring urging in the direction of the blade 2 a, 7 is a spindle of a drilling machine not shown, and 8 is a fixing bolt for fastening the hole saw body 2 to the spindle 7.
[0028]
As in the first embodiment, the hole saw body 2 has a cylindrical shape provided with an open end on one side and closed by a closing portion 2b on the other side, and a tapered cutting edge 2a is formed at the open end. The closing part 2b is provided with a boss 2c projecting outward at the center thereof. A fixed seat 2g for fastening the spindle 7 is detachably provided at the tip of the boss 2c.
[0029]
The deformation prevention guide 3 has a cylindrical shape that is open on one side and closed on the other side, is formed to have an inner diameter that is substantially the same as the outer diameter of the hole saw body 2, and a boss 2c is inserted into the center of the closed surface. Is provided.
[0030]
The deformation prevention guide 3 is urged in the direction of the cutting edge 2a by a coil spring 6 which is externally fitted to the boss 2c and compressed between the outside of the closed surface of the deformation prevention guide 3 and the fixed seat 2g. Further, it is fitted on the outer peripheral surface of the hole saw body 2 so as to be slidable.
[0031]
The hole saw device 1 is fastened by a fixing seat 2 a of the hole saw body 2 and a fixing seat 7 a at the end of the spindle 7 and a fixing bolt 8.
[0032]
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.
[0033]
When the hole saw device 1 is sent out toward the outer peripheral surface of the fluid pipe P by the spindle 7, the deformation prevention guide 3 first comes into contact with the outer peripheral surface of the fluid pipe P and stops moving, and when further fed out, the coil spring 6 is compressed and the hole saw body 2 is compressed. Only moves, and the cutting edge 2a contacts the outer peripheral surface of the fluid pipe P. When further pressed, the cutting edge 2a bites into the fluid pipe P and advances so as to push it out to make a hole.
[0034]
At this time, the hole saw body 2 bends and tends to be deformed into an ellipse that is long in the tube axis direction. However, since the deformation prevention guide 3 is provided so as to contact the outer surface, the deflection is controlled and the deformation is prevented. The hole saw body 2 is not damaged.
[0035]
Further, since the deformation prevention guide 3 is protruded before the cutting edge 2a during non-drilling, the cutting edge 2a is not damaged by hitting an object during handling of the hole saw device 1, and The worker is not injured by the cutting edge 2a.
[0036]
6 and 7 show a third embodiment of the hole saw device 1 according to the present invention, in which 2 is a hole saw body, 3 is a deformation prevention guide, 4 is a support bar for supporting the deformation prevention guide 3, 5 is a connecting bolt for connecting the deformation prevention guide 3 to the hole saw body 2, 6 is a coil spring for urging the deformation prevention guide 3 in the direction of the cutting edge 2a of the hole saw body 2, 7 is a spindle of a drilling machine not shown, and 8 is A fixing bolt for fastening the hole saw body 2 to the spindle 7 is shown.
[0037]
The hole saw body 2 has a cylindrical shape provided with an open end on one side and closed by a closed portion 2b on the other side, and a tapered cutting edge 2a is formed at the open end. Is provided with a boss 2c protruding outward. An opening 2d into which the connecting bolt 5 cannot be rotated and is slidable in the axial direction is inserted into the center of the boss 2c, and a fixing bolt 8 is screwed into a concentric circle outside the boss 2c. Two through-holes 2f through which the support bar 4 penetrates at an equal distance from the two female screw portions 2e and the outer boss 2c are provided.
[0038]
The deformation prevention guide 3 has a substantially rectangular shape formed so that arc-shaped portions 3f having substantially the same curvature as the inner peripheral surface 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. The arc-shaped portion 3f protrudes toward the cutting edge 2a with a predetermined width and has a U-shaped cross section. The inside of the tip of the projecting arc-shaped portion 3f is chamfered so as not to contact the outer peripheral surface of the fluid pipe P at the initial stage of drilling. A female screw portion 3c into which the connecting bolt 5 is screwed is provided at the center of the deformation prevention guide 3, and two female screw portions 3d into which the support bar 4 is screwed are provided at equal distances on both sides thereof.
[0039]
A deformation prevention guide 3 in which a central connecting bolt 5 and two support bars 4 at both ends thereof are screwed is externally fitted to the connecting bolt 5 and compressed between the inner surface of the closed portion 2b of the hole saw body 2 and the flat portion 3a. The hole saw device 1 mounted inside the hole saw body 2 in a state in which the coil spring 6 is biased in the direction of the cutting edge 2 a and cannot rotate and slide is fixed to a fixing seat 7 a at the end of the spindle 7 with a fixing bolt 8 is concluded.
[0040]
The drilling of the fluid pipe P by the hole saw device 1 of the third embodiment is performed in the same manner as in the first embodiment.
[0041]
When the cutting edge 2a moves in the direction of the tube center axis and is punched, the deformation prevention guide 3 is formed in a U-shaped cross section, so that it does not come into contact with the fluid pipe P. No resistance to pressing force is generated.
[0042]
When the drilling progresses, the direction perpendicular to the tube axis of the cutting edge 2a comes into contact with the outer peripheral surface of the fluid tube P, and when the portion starts to be cut, the deformation prevention guide 3 stays in place and the coil spring 6 is compressed and only the hole saw body 2 is compressed. Come on.
[0043]
The section cut out from the fluid pipe P is accommodated in the hole saw body 2 when the drilling is completed.
[0044]
In addition, the hole saw body 2 bends during drilling and tends to deform into an elliptical shape that is long in the tube axis direction, but a deformation prevention guide 3 is provided so as to come into contact with the inner surface of the hole saw at two points perpendicular to the tube axis. Therefore, since the deflection is controlled and the deformation is prevented, the hole saw body 2 is not damaged.
[0045]
The present invention is not limited to the above embodiments.
[0046]
In the embodiment, the deformation prevention guide is provided so as to move together with the hole saw body. However, the deformation prevention guide is set so as to be able to move separately, and the deformation prevention guide is first brought into contact with the outer peripheral surface of the fluid pipe at the time of drilling. And then drilling with a hole saw body.
[0047]
The deformation prevention guide in the second embodiment is formed in a cylindrical shape so as to be able to contact the hole saw main body on the entire circumference, but is formed so as to be in contact with the outer circumferential surface of the hole saw on two surfaces in the tube axis direction. May be.
[0048]
【The invention's effect】
According to the present invention, since the deformation prevention guide for preventing the deformation of the hole saw is provided, when the hole saw starts to bend during drilling of the tubular body, the deformation prevention guide comes into contact with the inner surface or the outer surface of the hole saw. Therefore, the deflection is suppressed and deformation is prevented. Therefore, the hole saw is prevented from being damaged because the deformation amount is minimized, and the fluid pipe can be perforated.
[0049]
According to the second aspect of the present invention, since the deformation prevention guide can be installed at a position effective for controlling the deflection of the hole saw, the deformation prevention guide is improved and the deformation prevention guide is provided so as not to hinder the drilling of the hole saw. be able to.
[0050]
According to the invention of claim 3, since the deformation prevention guide is not in contact with the outer peripheral surface of the fluid pipe, no excessive resistance to the axial pressing force of the drilling machine is generated, and the drilling work can be performed efficiently. .
[0051]
According to the fourth aspect of the present invention, since the deformation preventing guide that causes the deflection of the hole saw can be disposed, the deformation of the hole saw can be effectively prevented up to the tip of the hole saw.
[0052]
According to the invention of claim 5, it is possible to prevent breakage of the hole saw blade and injury of the operator.
[0053]
[Brief description of the drawings]
FIG. 1 is a partially cutaway front 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 a sectional view of a hole saw device showing a second embodiment of the present invention.
FIG. 5 is a side view of the hole saw device.
FIG. 6 is a sectional view of a hole saw device showing a third embodiment of the present invention.
FIG. 7 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 Closure part 2c Boss 2d Opening part 2e Female thread part 2f Through hole 2g Fixing seat 3 Deformation prevention guide 3a Plane part 3b Arc-shaped part 3c Female thread part 3d Female thread part 3e Through hole 4 Support bar 5 Connecting bolt 6 Coil spring 7 Spindle 7a Fixing seat 8 Fixing bolt 9 Split joint 9a Branch pipe part 10 Packing 11 Gate valve device

Claims (2)

A cylindrical tube drilling hole saw with a tapered cutting edge formed at the periphery of the opening,
An arcuate portion mounted inside the hole saw and provided so as to be relatively movable in the axial direction with respect to the hole saw and having an inner diameter of the cutting blade as a string and having substantially the same curvature of the outer peripheral surface of the tubular body It has a deformation prevention guide formed on the cutting edge side of the hole saw,
A hole drilling device for drilling a tube body, wherein the deformation prevention guide contacts the inner surface of the hole saw when it is bent, and stays in place when the direction perpendicular to the tube axis of the cutting blade abuts on the outer peripheral surface of the tube body. . A cylindrical tube drilling hole saw with a tapered cutting edge formed at the periphery of the opening,
Two arcuate portions mounted on the inside of the hole saw and provided so as to be relatively movable in the axial direction with respect to the hole saw and having substantially the same curvature as the inner peripheral surface of the hole saw main body A deformation prevention guide having a substantially rectangular shape formed so as to contact the inner peripheral surface of the hole saw body, wherein the arc-shaped portion protrudes toward the cutting edge with a predetermined width, and the cross section is formed in a U shape. Has
The hole drilling device for drilling a tube body, wherein the deformation prevention guide contacts the inner surface of the hole saw when it is bent, and stays in place when the direction perpendicular to the tube axis of the cutting blade comes into contact with the outer peripheral surface of the tube body.

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