JP5982660B2 - Pipe punching device - Google Patents

Description

  The present invention relates to a pipe punching device that can open a hole in an existing pipe buried in the ground or a pipe before being buried, and in particular, whether or not a cable is inserted into an existing pipe buried in the ground. In order to confirm, the present invention relates to a pipe punching device suitable for forming a confirmation hole in the existing pipe.

  In expansion work and switching work such as telephone lines, it is necessary to check whether cables or the like are inserted into existing pipes buried in the ground. This confirmation operation is performed by making a hole with a diameter of about 17 mm in an existing pipe. 2. Description of the Related Art Conventionally, as a device for drilling a hole in an existing pipe (pipe drilling device), a drilling tool (Patent Document 1) is known that rotates a blade by rotating a drill to open a hole in a pipe.

Utility Model Registration No. 3095561

  In the drilling tool described in Patent Document 1, the rotary shaft is difficult to rotate due to frictional heat generated by the rotation of the rotary shaft of the cutter, or the cutter rotates due to clogging in the gap between the hole and the cutter during drilling. It was difficult to do. Increasing the clearance will eliminate clogging of chips, but the hole dimensions will be inaccurate.

  The problem to be solved by the present invention is that the rotation is smoother than that of a conventional pipe drilling device, chips are less likely to be clogged during drilling, and a hole of a desired dimension can be drilled at a predetermined location of the pipe. In the case of opening, it is intended to provide a pipe punching device in which a cutter does not penetrate too deeply into a pipe after drilling, and a cable or the like (laying object) in the pipe is not damaged or cut. .

The pipe drilling device of the present invention is a pipe drilling device for making a hole in a pipe, a pipe holder that can hold the pipe from the outside, a blade support provided on the pipe holder, and a screw hole of the blade support. A lifting and lowering body that is screw-engaged so as to be able to rotate, a blade holder that is rotatably set on the lifting body, and a blade that is held by the blade holder. The blade holder is referred to as a rotary driving body (hereinafter referred to as “drill”). The same is true in the detailed description and claims.) A rotary shaft that can be attached and detached is provided, the rotary shaft is rotated by a drill to rotate the cutter, and the lifting body is manually operated to a screw hole of the cutter support base. screwed in, the pressing to the knives during rotation is lowered by passing through the insertion hole of the pipe holding body pipe is capable perforated pipe by the cutter, insertion of the pipe holding member The blade is inserted into the shaft hole of the bearing, can be rotated in the shaft hole of the bearing, and the lifting and lowering body is lowered in the rotation state so that the blade is held by the pipe holder. The sleeve is provided with a sleeve on the outer periphery of the cutter, and the sleeve has a small-diameter cylindrical portion having an outer diameter that can be inserted into the shaft hole of the bearing, and a large diameter having an outer diameter that cannot be inserted into the shaft hole of the bearing. A cylindrical portion, wherein the large-diameter cylindrical portion is provided closer to the cutter holder than the small-diameter cylindrical portion, and a step portion (locking portion) between the small-diameter cylindrical portion and the large-diameter cylindrical portion is provided in the pipe holder or the pipe holder. The blade is prevented from dropping further when it comes into contact with the bearing.

  A spacer capable of setting the lower limit of the lowering / lowering body is arranged on the outer periphery of the lifting body, and the outer diameter of the spacer is larger than the screw hole of the blade support base. It is also possible not to descend further.

  The spacer or the blade support is provided with an alarm (for example, LED, buzzer, vibrator, etc.), and the alarm is activated when the spacer contacts or approaches the blade support, and the drilling of the pipe with the blade is completed. This can be notified.

  The stop function by the step part of the small-diameter cylindrical part and the large-diameter cylindrical part of the sleeve and the stop function by the spacer are provided side by side to reliably prevent excessive descent of the blade after completion of drilling. Damage can be prevented.

  The spacer can be replaced with a spacer having a different height, and the lower limit position of the blade can be adjusted according to the thickness of the pipe.

The pipe punching device of the present invention has the following effects.
(1) Since the pipe can be drilled by manually screwing the lifting body and lowering the rotating blade, the pipe can be easily drilled.
(2) Since a bearing is provided on the pipe holder, and the blade is inserted into the shaft hole of the bearing and held by the bearing, the blade holder rotates smoothly, making it difficult for the blade to run out of the shaft. It is possible to reliably drill holes of a desired size.
(3) Since the cutter is held by the bearing, the cutter holder rotates smoothly even if the gap between the cutter and the inner peripheral surface of the insertion hole of the pipe holder is widened, and it is difficult for chips to clog the gap. , Can drill smoothly.
(4) When a spacer having an outer diameter larger than the screw hole of the blade support base is provided on the outer periphery of the rotating body, the blade does not enter the pipe more deeply than necessary because the spacer contacts the blade support. The laying in the pipe will not be damaged.
(5) When a sleeve having an outer diameter small diameter cylindrical portion that can be inserted into the shaft hole of the bearing and an outer diameter large diameter cylindrical portion that cannot be inserted into the shaft hole of the bearing is provided on the outer periphery of the cutter, When the stepped part of the large-diameter cylindrical part comes into contact with the pipe holder or the bearing of the pipe holder, the blade does not fall any further, preventing over-cutting of the pipe and laying cables etc. laid in the pipe Things will not be damaged.
(6) If the stop function by the step part of the sleeve and the stop function by the spacer are provided together, the lowering of the blade can be surely restricted, so that damage to the laying object due to overcutting of the pipe can be prevented.
(7) If the end of drilling is reported, the completion of drilling can be confirmed during drilling.
(8) If the lower limit of the lowering / lowering body can be adjusted by exchanging the spacer, the lowering dimension of the blade can be adjusted according to the thickness of the pipe, and pipes with different thickness can be drilled.
(9) Since the elevating body and the blade holder are supported by the blade support provided on the pipe holding body that holds the pipe, a hole having a predetermined size can be drilled at a predetermined portion of the pipe.

The perspective view which shows an example of the pipe punching apparatus of this invention. The exploded view of the pipe punching apparatus shown in FIG. It is a longitudinal cross-sectional view of the pipe punching apparatus shown in FIG. 1, (a) shows the state before screwing the lifting body into the blade support base, (b) shows the blade with the lifting body screwed into the blade support base. Shows a state where the pipe is lowered toward the pipe. It is the longitudinal cross-sectional view of the raising / lowering body of the pipe drilling apparatus shown in FIG. 1, a blade support stand, and a blade, (a) is sectional drawing of the state which decomposed | disassembled these, (b) is a cross section of the state which assembled (a) Figure. 1 shows an example of a cutter and a sleeve according to the present invention, wherein (a) is a front view of the cutter, (b) is a front view of the sleeve, and (c) is a sleeve of (b) on the outer periphery of the cutter of (a). The front view at the time of attaching. Fig. 4 shows another example of a sleeve according to the present invention, wherein (a) is a front view of a PS tube having an inner diameter of 50 mm and a sleeve for a V tube, (b) is a front view of a sleeve for a PS tube having an inner diameter of 75 mm, and (c). Is a front view of a sleeve for a V tube having an inner diameter of 75 mm. The example of a combination of a sleeve and a spacer in the present invention is shown, (a) shows an example of a combination of a sleeve and a spacer when the pipe is PS50 or V50, and (b) is a case where the pipe is PS75. An example of a combination of a sleeve and a spacer. (C) shows an example of a combination of a sleeve and a spacer when the pipe is V75. Explanatory drawing which shows the relationship between the dimension from the bottom face position of the spacer in this invention to the front-end | tip of the blade of a cutter, and the dimension from the upper surface position of a cutter support stand to the vertex of the upper inner peripheral surface of a pipe. BRIEF DESCRIPTION OF THE DRAWINGS It is dimension explanatory drawing from the front-end | tip of the blade of the cutter in this invention to the latching | locking part of a sleeve, Comprising: (a) is dimension explanatory drawing of the cutter provided with the sleeve for PS pipes with an internal diameter of 75 mm, (b) The dimension explanatory drawing of the cutter provided with the sleeve for V pipes.

(Embodiment)
An example of a pipe drilling device (hereinafter simply referred to as “punching device”) 1 of the present invention will be described with reference to the drawings. The perforating apparatus 1 can perforate various pipes P such as pipes buried in the ground and pipes laid on a railing of a bridge. When drilling into a pipe P buried in the ground, various cables (laying objects) such as telephone lines and optical communication cables laid in the pipe P are confirmed from the hole, and the situation inside the pipe P is confirmed. You can do it. Pipes P of various sizes are used as underground pipes P, but mainly steel pipes for cable protection (called PS pipes, V pipes, etc.) with inner diameters of 75 mm, 50 mm, and 25 mm are used. . Although the thickness of these pipes P varies depending on the outer diameter and application of the pipe P, for example, the thickness of a PS pipe having an inner diameter of 75 mm is about 4.2 mm, and the thickness of a V pipe having an inner diameter of 75 mm is about 7.0 mm. Hereinafter, the perforating apparatus 1 of the present invention will be described in detail.

[Outline of operation of punching device]
1 to 4 as an example, as shown in FIGS. 1 and 3, the pipe P is sandwiched from above and below by the pipe holding body 2 (the lower holding body 3 and the upper holding body 4). As shown in FIG. 3 (a), the lifting / lowering body 6 fitted in the screw hole 5a (FIG. 2) of the blade support base 5 fixed on the upper holding body 4 is turned by hand. As shown in FIG. 3 (b), the blade 8 held by the blade holder 7 (FIG. 2) attached to the lifting / lowering body 6 is lowered and the pipe P is moved by the rotating blade 8 along with the lowering. Can be drilled while cutting.

  As the elevating body 6 is lowered, the perforating apparatus 1 also descends the spacer 9 attached to the outer periphery of the elevating body 6 and hits the switch SW protruding above the blade support 5 when the perforation is completed, thereby completing the perforation. In addition to the notification, the elevating body 6-the blade holder 7-the blade 8 is prevented from further descending (the first stop function is provided). By this first stop function, the blade 8 does not enter the pipe P any more, and the laying material laid in the pipe P is not damaged or cut.

  The punching device 1 supports the blade holder 7 in the shaft hole of the bearing 23 (FIGS. 4A and 4B) of the lifting body 6 so that the blade holder 7 and the blade 8 attached thereto can rotate smoothly. It is like that.

  The punching device 1 covers the outer periphery of the cutter 8 by covering a sleeve 10 (FIGS. 2, 5B, and 5C) in which a small-diameter cylindrical portion 10a and a large-diameter cylindrical portion 10b are provided in two stages. When the blade holder 7 and the blade 8 attached thereto are lowered due to the lowering, the sleeve 10 is also lowered. (Hereinafter referred to as “locking portion”) 10c hits the pipe holding body 2 so that the elevating body 6-the blade holder 7-the blade 8 is not lowered any further (the second stop function is provided). ). This second stop function also prevents the blade 8 from entering the pipe P any further and prevents the laying object laid in the pipe P from being damaged or cut.

[Configuration of punching device]
As shown in FIG. 1, the drilling device 1 of the present invention includes a pipe holder 2 that can hold the pipe P from the outside thereof, a blade support 5 provided on the pipe holder 2, and the blade support 5. The lifting / lowering body 6 screwed in the screw hole 5a (FIG. 2), the blade holder 7 (FIG. 2) set rotatably on the lifting body 6, and the blade 8 (FIG. 2) held by the blade holder 7 2).

[Pipe holder]
As shown in FIG. 1, the pipe holding body 2 includes a lower holding body 3 addressing the lower side of the pipe P and an upper holding body 4 addressing the upper side. Both the lower holding body 3 and the upper holding body 4 are flat rectangular plates in plan view, and are provided with curved portions 3a, 4a (FIG. 2) along the outer shape of the pipe P on their inner surfaces. An insertion hole 11 (FIGS. 2, 3 (a) and (b)) is penetrated through the central portion of the upper holding body 4, and a bearing 11a (FIGS. 2, 3 (a) and (b)) is provided therein. It is fixed. The upper holding body 4 and the lower holding body 3 are connected by bolts 12 so that the pipe P is clamped and held, and can be fixed to the pipe P.

  The pipe holder 2 may have any other structure as long as it can hold the pipe P. For example, the upper holder 4 uses a plate-like member shown in FIG. 2, and the lower holder 3 has an elongated shape such as a wire or a chain. Using a material (not shown), winding it around the lower half of the outer periphery of the pipe P, pulling it upward, and fixing both ends to the upper holder 4 with fasteners (screws, hooks, etc.) The pipe P can be clamped and held between the body 3 and the upper holding body 4, and the pipe holding body 2 can be fixed to the pipe P.

  The pusher 13 shown in FIG. 2 is unnecessary when drilling in the pipe P before being buried, but is suitable for use when the pipe P is buried in the ground. In some cases, a plurality of pipes P are closely buried in the ground. In this case, it may be difficult to make a hole under the pipe P, and it may be difficult to dispose the lower holding body 3 under the pipe P. In such a case, as shown in FIG. 2, the pusher 13 is attached to one side surface in the longitudinal direction of the lower holding body 3 and can be pushed under the pipe P by the pusher 13.

  As an example, the pressing tool 13 shown in FIG. 2 includes an addressing surface 13a that can be addressed to the side surface of the lower holding body 3, and a gripping bar 13b that protrudes outward from the addressing surface 13a. . The pressing tool 13 can be attached to and detached from the lower holding body 3, and the addressing surface 13 a is applied to the side surface of the lower holding body 3 so that it can be fixed with screws. The pressing tool 13 may have a shape other than this.

[Cutter support stand]
The blade support base 5 fixed on the upper holding body 4 is a downward U-shaped gate type, the upper plate 14 has a screw hole 5a at the center, and the lower end 16 of the leg 15 is a stopper (for example, Screws 17 are fixed to the upper holding body 4 (FIGS. 3A and 3B).

  A switch SW (FIG. 2) is disposed on the side surface of the blade support 5. As the switch SW, a limit switch, a proximity switch, or the like can be used. In the case of these limit switches SW, they are mounted so as to protrude slightly above the upper surface of the blade support 5, and in the case of a proximity switch, they are arranged in the vicinity of the blade support 5. An alarm device X is connected to these switches SW. The alarm and the power supply circuit necessary for its operation are accommodated in the power supply box 18 on the side surface of the blade support 5.

  The switch SW moves the blade holder 7 -the blade 8 -the spacer 9 as shown in FIG. 3 (b) as the elevating body 6 is lowered to complete the drilling of the pipe P by the blade 8 (immediately before and after the completion). And the alarm device X is operated (LED is caused to emit light, the buzzer is sounded, the vibrator is vibrated, etc.), and the completion of the drilling is notified (the notification function is provided). Further, the spacer 9 is in contact with the blade support 5 so that the elevating body 6 -the blade holder 7 -the blade 8 -the spacer 9 is not further lowered (the first stop function is provided).

[Elevator]
1-4 includes a cylindrical portion 19 and a flange 20 having an outer diameter larger than that, a hole 21 is opened at the center of the flange 20, and a bearing 23 is provided in an internal space 22 of the cylindrical portion 19. (FIGS. 4A and 4B) are arranged and fixed in two upper and lower stages, and a screw 24 is cut on the outer peripheral surface of the cylindrical portion 19. This screw 24 is screwed into the screw on the inner surface of the screw hole 5a of the blade support base 5, and when the rod 20 is turned clockwise by hand, the elevating body 6 is screwed into the screw hole 5a and lowered. When reversely rotated, the elevating body 6 rises.

[Cut tool holder]
The blade holder 7 is inserted into the shaft hole of the bearing 23 (FIGS. 4A and 4B). The blade holder 7 can be attached to and detached from the lower portion thereof. As an example, the blade holder 7 shown in FIGS. 2 and 4 (a) has a rotating shaft 25, a shaft support portion 26, and a fitting portion 27 connected in sequence from top to bottom. The rotary shaft 25 can attach and detach the socket S (FIGS. 3A and 3B) of the rotary drive body (drill), and is attached to the blade holder 7 when rotated by the drill (FIGS. 3A and 3B). The cutting tool 8 is rotated.

  As shown in FIGS. 4A and 4B, the fitting portion 27 includes an inner spring 29 and a ball 30, and when the blade 8 is pushed into the fitting hole 28 of the fitting portion 27 from the tip 8a side, The inner spring 29 is pressed and contracted by the tip 8 a of the blade 8, the ball 30 is fitted in the fitting groove 31 of the blade 8, and the blade 5 is held by the blade holder 7. In the mounted state of FIG. 4B, the cutter 8 is strongly pulled downward, the ball 30 is removed from the fitting groove 31, and the cutter 8 is further pulled down in this state so that the cutter 8 can be detached from the cutter holder 7. .

[Cutter]
The cutter 8 that is attached to and detached from the cutter holder 7 is used to punch a pipe P, and a general-purpose hole saw can be used. As an example, what is shown in FIG. 5 (a) is cylindrical, the fitting groove 31 is formed in a ring shape on the outer peripheral surface of the upper end portion, and the blade 32 is formed in a ring shape on the lower end portion. The diameter of the blade 32 can be appropriately selected according to the size of the hole drilled in the pipe P.

[sleeve]
A sleeve 10 is put on the outer periphery of the cutter 8, and is fixed to the cutter 8 with a stopper (for example, a hexagon socket bolt) 33 (FIG. 5C). The sleeve 10 prevents the blade 8 from further entering the pipe P after completion of the drilling of the pipe P, and prevents damage to the laying material in the pipe P, breakage, cutting, etc. of the laying material. is there.

  In the sleeve 10 shown in FIGS. 5B and 6A to 6C, a large-diameter cylindrical portion 10b is continuously provided on a small-diameter cylindrical portion 10a. The outer diameter of the small diameter cylindrical portion 10a is a size that can be inserted into the shaft hole of the bearing 11a (FIGS. 3A and 3B) provided in the upper holding body 4, and the outer diameter of the large diameter cylindrical portion 10b. Is a size that cannot be inserted into the shaft hole of the bearing 11a. The locking portion 10c between the small diameter cylindrical portion 10a and the large diameter cylindrical portion 10b is as shown in FIG. 3 (b) when the elevating body 6-the blade holder 7-the blade 8 is lowered and drilling with the blade 8 is completed. By striking the upper surface of the bearing 11a, the elevating body 6-the blade holder 7-the blade 8 is not lowered any further, and the blade 8 can be prevented from entering the pipe P (the second stop function is provided). It ’s also available.)

  The size of the sleeve 10 is also selected and used according to the size of the blade 8.

[Spacer]
The spacer 9 is a ring shape having an inner diameter that is slightly larger than the outer diameter of the elevating body 6, and covers the outer periphery of the elevating body 6 as shown in FIGS. 3 (a), 3 (b), and 4 (b). The lifting body 6 is held so as not to fall from the lifting body 6. As an example, the spacer 9 shown in FIGS. 7A to 7C includes a cylindrical portion 9 a that covers the outer periphery of the elevating body 6 and a flange portion 9 b that has a larger outer diameter than the cylindrical portion 9 a. The flange 9b has a diameter larger than the diameter of the screw hole 5a of the blade support 5 and the spacer 9 is placed on the surface of the upper plate 14 of the blade support 5 in a state where the lifting body 6 is screwed to the blade support 5. It is made to contact. On the surface side of the upper plate 14, a switch SW as a restricting means protrudes, and when the elevating body 6 is rotated and pushed down, the flange portion 9b of the spacer 9 abuts (contacts) the switch SW. The alarm device X operates.

The spacer 9 is preferably prepared in various sizes corresponding to the vertical dimension of the large-diameter cylindrical portion 10b of the sleeve 10. 7 (a) shows shows a combination example of the sleeve 10 and the spacer 9 when the pipe P is drilled is PS50 or V50, 28.0 mm the longitudinal dimension _{S 1} of the large-diameter cylindrical portion 10b of the sleeve 10 (longitudinal dimension _{L 1} of the small diameter cylinder portion 10a is 14.0 mm: see FIG. 6 (a)), certain longitudinal dimension _{T 1} of the cylindrical portion 9a of the spacer 9 as 11.0 mm. FIG. 7 (b) are those showing an example of a combination of the sleeve 10 and the spacer 9 when the pipe P is drilled is PS75, longitudinal dimension _{S 2} to 26.1 mm (diameter of the large-diameter cylindrical portion 10b of the sleeve 10 longitudinal dimension _{L 2} of the cylindrical portion 10a is 15.9 mm: see FIG. 6 (b)), certain longitudinal dimension _{T 2} of the cylindrical portion 9a of the spacer 9 as 9.0 mm. FIG. 7 (c) is indicative of the combination of the sleeve 10 and the spacer 9 when the pipe P is drilled is V75, the vertical dimension S ₃ to 22.2 mm (small diameter cylinder of a large diameter cylindrical portion 10b of the sleeve 10 longitudinal dimension _{L 3} parts 10a is 19.8 mm: see FIG. 6 (c)), certain longitudinal dimension _{T 3} of the cylindrical portion 9a of the spacer 9 as 6.0 mm. The combination is an example, and the sleeve 10 and the spacer 9 may be other combinations.

[Attaching the blade holder to the lifting body]
The blade holder 7 is inserted into the shaft hole of the bearing 23 (FIGS. 4A and 4B) in the internal space 22 of the lifting body 6 so that the blade holder 7 can rotate together with the bearing 23. In this case, the rotary shaft 25 of the blade holder 7 protrudes upward from the hole 21, and a disc-shaped stop plate 34 disposed outside the rotary shaft 25 is disposed in the hole 21, and the stop plate 34 is inserted into the hole 21. The blade holder 7 is fixed to the elevating body 6 by the inserted lock bolt 35 so that the cutter holder 7 does not fall out of the elevating body 6 inadvertently.

(Example of use)
The usage example of the punching apparatus 1 of this invention is demonstrated with reference to Fig.3 (a) (b).
(1) As shown in FIG. 3A, the lower holding body 3 is arranged under the pipe P, the upper holding body 4 is arranged on the pipe P, and the lower holding body 3 and the upper holding body 4 are connected. It connects with the volt | bolt 12, the pipe P is hold | maintained between both the holders 3 and 4, and the blade support stand 5 currently fixed to the upper holding body 4 is fixed to the pipe P. FIG.
(2) As shown in FIG. 3A, the elevating body 6 is set in the screw hole 5a of the blade support 5 and the power of the drill is turned on to rotate the blade 8. In this state, the lifting / lowering body 6 in the screw hole 5a is manually rotated and lowered along the screw of the screw hole 5a (FIG. 3B).
(3) The blade holder 7 -the blade 8 -the spacer 9 is lowered by the lowering, and screwed in until the spacer 9 comes into contact with the upper surface of the blade support 5. Even if the cutter 8 hits the pipe P due to this descending, it continues to rotate, and the pipe P is drilled while being cut. Due to the lowering, the switch SW (FIG. 3B) is pushed by the spacer 9, the alarm X is activated, and the completion of drilling is notified.

  At the time of the notification, the spacer 9 comes into contact with the upper surface of the blade support 5 and the elevating body 6 cannot be lowered any more, so that the lowering of the blade 8 is stopped (first stop function works), The lowering of the blade 8 is stopped. At this time, the locking portion 10c of the sleeve 10 comes into contact with the bearing 11a (FIG. 3 (b)), and the lowering of the blade 8 is stopped (second stop function works), and the lowering of the blade 8 after completion of drilling is stopped. Stopped (stop function works in two steps).

The first stop function will be described with reference to FIG. As shown in FIG. 8, perforating device 1 of the present invention, the distance X from the bottom position X ₁ of the spacer 9 to the tip X ₂ of the tool 8, in the above the upper surface position Y ₁ of the tool support base 5 of the pipe P since the distance Y to the vertex Y ₂ of the peripheral faces are designed to have the same or substantially the same, the lifting body 6, the flange portion 9b of the spacer 9 lowers until it abuts against the upper surface of the tool support base 5 The blade 8 does not fall any further.

A 2nd stop function is demonstrated with reference to Fig.9 (a) (b). FIG. 9A shows a case where the pipe P is a PS pipe having a thickness of about 4.2 mm, and FIG. 9B shows a case where the pipe P is a V pipe having a thickness of about 7.0 mm. As shown in FIGS. 9A and 9B, the sleeve 10 includes an outer diameter small diameter cylindrical portion 10a that can be inserted into the shaft hole of the bearing 11a and an outer diameter large diameter cylindrical portion 10b that cannot be inserted into the shaft hole of the bearing 11a. It has. Perforating device 1 of the present invention, the distance A from the surface position A ₁ of the upper holding member 4 to the apex A ₂ in the upper inner peripheral surface of the pipe P, from a position B ₁ of the engaging portion 10c of the sleeve 10 of the tool 8 Since the distance B to the tip B ₂ is designed to be the same or substantially the same, the blade 8 is connected to the inner peripheral surface of the pipe P (the inner peripheral surface is completely cut or a thin skin is connected). The locking portion 10c of the sleeve 10 is locked to the surface of the upper holding body 4 (bearing 11a: see FIG. 3B), and the downward movement of the blade 8 is prevented.

  The two stop functions can be both provided or only one of them can be provided.

  The perforation apparatus 1 of the present invention can be used for perforation of various pipe materials such as a gas pipe and a water pipe in addition to perforation of a telephone pipe buried in the ground.

1 Pipe punching device (Punching device)
DESCRIPTION OF SYMBOLS 2 Pipe holding body 3 Lower holding body 3a Curved part 4 Upper holding body 4a Curved part 5 Blade support stand 5a Screw hole 6 Lifting body 7 Blade holder 8 Cutlery 8a Tip 9 Spacer 9a Tube part 9b Gripper part 10 Sleeve 10a Small diameter cylinder part 10b Large diameter cylinder part 10c Bottom surface of large diameter cylinder part (locking part)
DESCRIPTION OF SYMBOLS 11 Insertion hole 11a Bearing 12 Bolt 13 Pusher 13a Addressing surface 13b Holding rod 14 Upper plate 15 Leg part 16 Lower end part 17 Stopper 18 Power supply box 19 Cylindrical part 20 ２１ 21 hole 22 Internal space 23 Bearing 24 Screw 25 Rotating shaft 26 Shaft support portion 27 Fitting portion 28 Fitting hole 29 Inner spring 30 Ball 31 Fitting groove 32 Blade 33 Stopper 34 Stop plate 35 Lock bolt P Pipe S Socket SW Switch X Alarm

Claims (5)

In a pipe punching device that opens a hole in a pipe,
A pipe holder that can hold the pipe from the outside, a blade support provided on the pipe holder, a lift that is screwed up and down in a screw hole of the blade support, and a set that is rotatable on the lift A blade holder and a blade held by the blade holder,
The blade holder includes a rotary shaft to which a drill can be attached and detached,
The rotary shaft is rotated with a drill to rotate the cutter, and the lifting body is screwed into the screw hole of the cutter support base by manual operation, and the rotating cutter is lowered to pass through the insertion hole of the pipe holder. When pressed by the pipe, Ri pierceable der the pipe by the tool,
A bearing is provided in the insertion hole of the pipe holder,
The blade is inserted into the shaft hole of the bearing and can be rotated in the shaft hole of the bearing, and the elevating body is lowered in the rotation state, so that the pipe held by the pipe holder can be drilled. Yes,
A sleeve is provided on the outer periphery of the cutter,
The sleeve includes a small-diameter cylindrical portion having an outer diameter that can be inserted into the shaft hole of the bearing, and a large-diameter cylindrical portion having an outer diameter that cannot be inserted into the shaft hole of the bearing.
The large diameter cylindrical portion is provided on the blade holder side than the small diameter cylindrical portion,
When the step portion (locking portion) between the small diameter cylindrical portion and the large diameter cylindrical portion abuts on the pipe holder or a bearing provided on the pipe holder, the blade does not fall any further.
A pipe drilling device characterized by that. In the pipe perforation device according to claim 1 Symbol placement,
A spacer that can set the lower limit of lowering of the lifting body is arranged on the outer periphery of the lifting body,
The outer diameter of the spacer is larger than the screw hole of the blade support,
When the spacer comes into contact with the blade support, the blade does not fall any further.
A pipe drilling device characterized by that. In the pipe perforation device according to claim 2 Symbol placement,
The spacer or blade support is equipped with an alarm,
The alarm operates when the spacer comes into contact with or approaches the blade support, and can notify that the drilling of the pipe with the blade has been completed.
A pipe drilling device characterized by that. In the pipe drilling device according to any one of claims 1 to 3 ,
The stop function by the step part of the small diameter cylinder part and the large diameter cylinder part of the sleeve and the stop function by the spacer are provided side by side.
A pipe drilling device characterized by that. In the pipe drilling device according to any one of claims 2 to 4 ,
The spacer can be replaced with a spacer of different height, and the lower limit position of the blade can be adjusted according to the thickness of the pipe.
A pipe drilling device characterized by that.

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