JP2013159044A - Boring drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust-collecting type boring drill in which a drill section can be attached to/detached from a drill body.SOLUTION: A boring drill includes a drill body, a drill section provided at the tip of the drill body, and a dust collection hole extending in a rotation axis direction of the drill body from the tip of the drill section. The drill body is equipped with a mounting part formed in a tapered shape where a diameter of the drill body decreases toward the tip where the drill section is provided. A mounting hole having a contact face aligning with a diameter of a tapered peripheral surface of the mounting part is formed on the drill section, and the drill section is provided to be detachable from the drill body.

Description

  The present invention relates to a drill for drilling concrete, stone, or the like, and more particularly, to a dust-absorbing drill for preventing the scattering of concrete dust or the like in a drilling operation.

  Examples of dust-absorbing drills for drilling include those disclosed in Patent Documents 1 and 2. In a conventional dust-absorbing drill, a dust-collecting hole is formed from a shank portion connected to an electric motor to a drill portion provided with a cutting blade portion, and a dust-collecting hole that is inserted into the dust-absorbing hole is provided at a tip portion. .

  The drill body has a discharge hole inserted through the dust suction hole, and a dust suction adapter that can be connected to a dust suction machine (aspirator) can be attached to the position of the discharge hole. Dust and the like shaved by the cutting blade portion are sucked into the dust collector through the dust collection hole, the dust suction hole, and the discharge hole, and scattering of the dust and the like during drilling is prevented. The dust suction adapter is attached in a stationary state with respect to the rotation of the drill body, and is connected to a dust suction machine (aspirator) via a hose or the like.

JP-A-9-272118 JP 2010-201733 A

  Since the drill part provided with the cutting edge part of the drill for drilling as in Patent Documents 1 and 2 is formed integrally with the drill body in which the shank part is formed, for example, the cutting edge part is damaged or different. When drilling with a hole diameter, the entire drill body must be removed from the motor. For this reason, while the effort of replacement | exchange takes, since the whole drill main body including a drill part was replaced | exchanged, the subject that cost became high occurred.

  On the other hand, it is conceivable that the drill part on which the cutting edge part is formed and the drill main body are configured to be detachable so that the drill part can be removed from the drill main body. Since the drill (vibration) is continuously applied in the direction of the rotation axis while rotating the drill for drilling by means, for example, if the drill part is attached to the drill body by screw fitting, the fit becomes strong It will pass and it will be difficult to remove the drill part from the drill body.

  In addition, when drilling into a concrete structure, it is necessary to drill a hole while avoiding a reinforcing bar or the like that is already provided inside the concrete structure, but the reinforcing bar or the like may interfere with the drilling to a predetermined depth. Conventionally, if drilling is obstructed in the middle by a reinforcing bar, etc., the hole in the middle of drilling is expanded (enlarged) and drilled again near the same position so as to avoid the reinforcing bar, In order to avoid rebars and the like by tilting, the drilling was performed obliquely rather than in a substantially vertical direction with respect to the drilling surface of the concrete structure.

  However, since the diameter of the hole is expanded by re-drilling, there is a problem that an extra volume of the hole in which the injection material injected into the hole is expanded is necessary. Also, when drilling diagonally on the drilling surface of a concrete structure so as to avoid reinforcing bars, conventional drilling drills have a diameter of approximately the same size from the drill body to the drill part where the cutting edge is formed. Therefore, by drilling at an angle with the drill body inclined, the diameter near the entrance of the hole is larger than the diameter of the drill part, and an extra injection material is required, and the anchor member provided in the hole drilled diagonally There was a problem that had to be fixed.

  An object of the present invention is to provide a dust-absorbing drill for drilling, in which a drill part and a drill body are individually configured, and the drill part can be easily attached to and detached from the drill body.

  Furthermore, as another object of the present invention, when drilling a concrete structure including a reinforcing bar or the like, even if the drilling operation is hindered by the reinforcing bar or the like during the drilling, the expansion of the unnecessary hole diameter is suppressed. It is another object of the present invention to provide a dust-absorbing drill for drilling capable of drilling while avoiding reinforcing bars.

  The drill for drilling according to the present invention includes a drill body, a drill portion provided at the tip of the drill body, and a dust suction hole extending from the tip of the drill portion in the rotation axis direction of the drill body. The drill body is provided with a mounting portion formed in a tapered shape with a small diameter of the drill body toward a tip where the drill portion is provided, and the drill portion is formed on a tapered peripheral surface of the mounting portion. A mounting hole having a contact surface that matches the diameter is formed, and is detachable from the drill body.

  Further, the drill body may have a dust suction / discharge hole that is inserted through the dust suction hole and opens in a radial direction, and the diameter of the drill body from the mounting part to the dust suction / discharge hole is set to a diameter of the drill part. It can comprise so that it may form smaller than.

  Further, when the drill body is positioned inside the hole of the drilled object to be drilled to a size corresponding to the diameter of the drill portion, the drill body and the hole of the drilled object to be drilled The diameter of the drill body can be configured to be smaller than the diameter of the drill portion so that a predetermined gap is formed between the wall surface and the wall surface.

  According to the present invention, since the drill main body and the drill portion are connected via the tapered contact surface, the drill portion can be easily attached to and detached from the drill main body, reducing the labor and cost of replacement. Can be made.

1 is an external perspective view of a dust-absorbing drill for drilling of Example 1. FIG. 1 is a cross-sectional view of a dust-absorbing drill for drilling of Example 1. FIG. FIG. 3 is a diagram illustrating a usage example of the dust-absorbing drill for drilling of Example 1. It is the figure which showed the connection structure of the drill part with which the front-end | tip of the drill main body of Example 1 is mounted | worn. It is a figure which shows an example of the drilling process with respect to the concrete structure using the dust absorption type drill for drilling of Example 1. FIG. It is a figure which shows an example of the drilling process with respect to the concrete structure using the conventional dust-absorbing type drill for drilling. It is a top view of the hole drilled in the concrete structure corresponding to the drilling process shown in FIG.5 and FIG.6, (a) is the hole using the dust-absorbing type drill for drilling of Example 1, (b) is This is a hole using a conventional dust-absorbing drill for drilling.

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

Example 1
1 to 7 are diagrams showing Embodiment 1 of the present invention. As shown in FIGS. 1 and 2, the drill 1 for drilling according to the present embodiment is attachable to and detachable from a drill body 3 having a shank portion 31 attached to a chuck portion 110 of a drill driving means 100 and a tip of the drill body 3. And a drill portion 4 to be mounted.

  The drill body 3 is formed in an elongated shape in the rotation axis direction (length direction), and a mounting portion 36 on which the drill portion 4 is mounted on a tip 35 opposite to the end portion where the shank portion 31 is formed. Is formed. The mounting portion 36 is provided at the distal end portion of the shaft portion 32 extending from the shank portion 31, and the diameter of the shaft portion 32 is tapered toward the distal end 35.

  In the drill body 3, a dust suction hole 37 extending from the tip 35 in the rotation axis direction of the drill body 3 is formed inside. A dust suction / discharge hole 33 is formed at a predetermined position between the shaft portion 32 and the shank portion 31 so as to pass through the dust suction hole 37 and open in the radial direction. The dust suction / discharge hole 33 is formed in the adapter mounting portion 34 in which the dust suction adapter 50 between the shaft portion 32 and the shank portion 31 is provided. The dust suction adapter 50 is formed in an annular shape, and is attached to the adapter mounting portion 34 in a state of being stationary with respect to the rotation of the drill main body 3, and the locking ring 51 prevents movement in the direction of the rotation axis.

  The dust suction hole 37 is a passage that guides dust or the like cut by the drill portion 4 to the dust suction discharge hole 33, and has the same diameter D3 from the opening 37a of the tip 35 to the adapter mounting portion 34 (dust suction discharge hole 33). Is formed.

  The drill portion 4 includes a cutting edge portion 41 at the tip, and a mounting hole 43 having a contact surface 42 that matches the diameter of the tapered peripheral surface of the mounting portion 36 of the drill body 3 is formed. The mounting hole 43 is inserted through a dust collection hole 44 that opens at the end face of the tip portion 41a of the drill portion 4 where the cutting blade portion 41 is provided. By inserting the mounting portion 36 of the drill body 3 into the mounting hole 43 inserted through the dust collection hole 44, the dust collection hole 44 and the dust collection hole 37 communicate with each other, and dust and the like are taken in from the dust collection hole 44, and the dust collection The dust is discharged from the dust suction hole 33 through the hole 37 to the outside of the hole. The dust suction hole 37 of the drill 1 for drilling of the present embodiment can include a mounting hole 43 of the drill portion 4 and a path between the mounting hole 43 and the dust collecting hole 44, and drills from the drill portion 4 to the dust suction discharge hole 33. The drill 1 extends in the rotation axis direction.

  FIG. 3 is a diagram illustrating a usage example of the drill 1 for drilling according to the present embodiment. The drill 1 for drilling according to the present embodiment is mounted on the chuck portion 110 of the drill driving means 100, and the dust suction adapter 50 is mounted on the adapter mounting portion 34. The dust suction adapter 50 is connected to the dust suction machine 52 via the hose 53. The drill driving means 100 is an electric or hydraulic drill driving device that rotates the drill 1 for drilling in the radial direction by an operator's operation and continuously applies impact (vibration) in the rotation axis direction. The dust etc. which arise from the concrete structure C by which the dust suction machine 52 is pierced are sucked.

  FIG. 4 is a diagram illustrating an example of a connection structure between the drill body 3 and the drill portion 4. As shown in FIG. 4, the mounting portion 36 has a tapered peripheral surface 36 a that is formed such that the diameter D <b> 1 of the tip 35 is smaller than the diameter D <b> 2 of the shaft portion 32 and is inclined toward the tip 35. . The mounting portion 36 is formed in the shaft portion 32 from the tip 35 toward the shank portion 31 up to a predetermined position. The length of the mounting portion 36 formed in the shaft portion 32 corresponds to the length of the mounting hole 43 of the drill portion 4.

  The mounting hole 43 is formed in a taper shape in which the diameter D6 on the front end side where the cutting edge portion 41 is provided is smaller than the diameter D5 of the opening into which the mounting portion 36 is inserted, and the taper circumferential surface 36a of the mounting portion 36 is formed. A contact surface 42 that matches the diameter is formed. The diameter D5 of the opening of the mounting hole 36 is larger than the diameter D1 of the tip 35 of the drill body 3, and is the same as or smaller than the diameter D2 of the shaft portion 32.

  The taper angle of the tapered peripheral surface 36 a of the mounting portion 36 and the taper angle of the tapered contact surface 42 of the mounting hole 43 of the drill portion 4 are the same, and the contact surface 42 of the mounting hole 43 is the tapered peripheral surface of the mounting portion 36. The drill portion 4 is mounted on the drill body 3 by making surface contact with 36a. For this reason, the drill part 4 is fixed to the mounting part 36 of the drill body 3 without the drill part 4 being detached during the drilling operation. Further, when removing the drill portion 4 from the drill body 3, the step due to the difference in diameter between the drill portion 4 and the drill body 3 is used to strike the drill portion 4 from the direction of the rotation axis of the drill 1 for drilling. Etc., the surface contact between the tapered peripheral surface 36a and the contact surface 42 is released, and the drill portion 4 can be easily removed from the drill body 3.

  The taper angle of the present embodiment is formed with a relatively gentle gradient. For example, when the diameter of the tip 35 of the mounting portion 36 is Amm, the gradient is such that the diameter at the position advanced 25 mm from the tip 35 is about A + 1 mm, in other words, the tip 35 is advanced 25 mm with respect to the diameter Amm of the tip 35. It can be formed in a gentle gradient in which the increase rate of the position diameter is 2 to 3%. By forming the taper angle at a gentle slope in this way, the drill part 4 can be easily detached from the drill body 3 by fitting with the taper while ensuring the connectivity between the drill body 3 and the drill part 4. Can do.

  In a state where the mounting portion 36 is inserted and mounted in the mounting hole 43 of the drill portion 43, the contact surface 42 of the mounting hole 43 is in surface contact with the tapered peripheral surface 36 a of the mounting portion 36, while the drill body 3 (the mounting portion 36 ) And a mounting hole 43 in the direction of the cutting edge portion 41 at the front end, and dust or the like flowing in from the dust collecting hole 44 is absorbed by the opening 37a located in the mounting hole 43. Guided to hole 37.

  The diameter D2 of the drill body 3 from the mounting portion 36 to the dust suction / discharge hole 33, that is, the diameter D2 of the shaft portion 32 is formed smaller than the diameter D4 of the drill portion 4. That is, the diameter D2 of the drill body 3 (shaft portion 32) located inside the drilled hole is smaller than the hole diameter corresponding to the diameter D4 of the drill portion 4 drilled in the drilled object such as a concrete structure. It is formed to become. For this reason, between the inner wall surface of the hole to be drilled according to the diameter D4 of the drill part 4 and the drill body 3 positioned inside the hole to be drilled, the diameter D4 of the drill part and the drill body part 3 A gap corresponding to the difference (difference) from the diameter D2 is formed.

  For example, when the diameter D2 of the drill body 3 (shaft part 32) is 19 mm and the diameter D4 of the drill part 4 is 35 mm, the inner wall surface of the hole to be drilled according to the diameter D4 of the drill part 4 and the drill body 3 A gap of 8 mm is formed between the outer peripheral surface.

  5 to 7 are diagrams for explaining the punching process of the present embodiment. As shown in FIG. 5 (a), a reinforcing bar or the like is already installed in the concrete structure C to be drilled, and the drilling surface 1 of the concrete structure C is used to drill the concrete structure C. On the other hand, in the middle of drilling vertically, there are cases where the reinforcing bars inside the concrete structure C get in the way, and drilling to a predetermined depth may not be possible.

  In this case, in the drill 1 for drilling according to the present embodiment, the diameter D2 of the shaft portion 32 located inside the drilled hole is narrower than the diameter D4 (diameter of the drilled hole) of the drill part 4, and thus the drill is drilled. A gap is formed between the inner wall surface of the hole and the outer peripheral surface of the shaft portion 32. From the state shown in FIG. 5 (a), the operator tilts the drill 1 for drilling back and forth, left and right (or up and down, left and right) so as to avoid the reinforcing bars by the gap formed in the drilled hole and resumes drilling again. (FIG. 5B). At this time, the end near the hole entrance of the drilling surface is not scraped by tilting the drill 1 for drilling, but drilled in the same diameter as the diameter of the hole before reaching the reinforcing bar (the diameter D4 of the drill part 4). The drill 1 can be tilted so as to avoid the reinforcing bars.

  Then, the operator tilts and drills the drill 1 for drilling in the state shown in FIG. 5B, so that the bottom of the hole drilled with respect to the diameter D4 of the drill part 4 is expanded. Thereafter, the drill 1 for drilling is slid in the direction opposite to the direction in which the shaft portion 32 is inclined, and the drill is drilled in the vertical direction without being refracted from the middle while maintaining the same diameter as that before reaching the reinforcing bar. can do.

  Thus, in the drill 1 for drilling of this embodiment, the diameter D2 of the shaft portion 32 located inside the drilled hole is narrower than the diameter D4 (drilled hole diameter) of the drill portion 4, so that the drilled hole A gap is formed between the shaft portion 32 and the shaft portion 32. Therefore, drilling can be performed while avoiding the reinforcing bars by tilting the drilling drill 1 without shaving the end portion near the hole entrance of the drilling surface, and the hole diameter is adjusted from the end portion near the hole entrance of the drilling surface to the bottom of the hole. The concrete structure C can be drilled straight without spreading larger than the diameter D4.

  On the other hand, when the diameter D4 of the drill portion 4 and the diameter D2 of the shaft portion 32 located inside the drilled hole are the same as in the prior art, the inner wall surface of the drilled hole and the shaft portion 32 No gap is formed between the outer peripheral surface. For this reason, in order to incline the drill 1 for drilling so as to avoid the reinforcing bars, the end of the drilling surface near the hole entrance must be cut. FIG. 6A is a diagram showing a conventional drilling process, in which the end portion near the hole entrance of the concrete structure C indicated by diagonal lines is shaved, and the hole diameter increases. Further, as shown in FIG. 6B, if the hole is not formed obliquely while avoiding the reinforcing bar, the drilling drill cannot be slid in the direction opposite to the inclined side. The hole diameter corresponding to D4 must be cut again to extend from the end near the hole entrance to the bottom.

  FIG. 7 is a view of a hole drilled in the concrete structure C from above. FIG. 7A shows a case where the drill 1 for drilling of this embodiment is used, and FIG. Each of the drills for drilling is shown.

  As shown in FIG. 7 (a), the drill 1 for drilling of the present embodiment has a gap between the outer periphery of the shaft portion 32 and the inner wall of the drilled hole with respect to the hole diameter corresponding to the diameter D4 of the drill portion 4. Therefore, for example, after the shaft portion 32 is tilted and drilled, the drill 1 for drilling can be slid in the direction opposite to the tilted distance d1 and drilled again.

  On the other hand, in the conventional drill for drilling, as shown in FIG. 7B, when the same angle is tilted upward, the end R1 near the entrance of the drilled hole is cut and the drill for drilling is performed. Since it cannot be slid and moved in the direction opposite to the inclined side, it is necessary to drill again so as to widen the hole diameter corresponding to the diameter D4 of the drill part 4. For example, when the slide drill 1 for drilling (FIG. 7A) of the present embodiment is slid by the distance d1, it is necessary to cut the region R2 excessively in FIG. 7B.

  For this reason, the diameter of the hole drilled from the end near the hole entrance of the drilling surface to the bottom becomes larger than the diameter D4 of the drill section 4. As described above, in the conventional drill for drilling, when it is obstructed by a reinforcing bar or the like in the middle of drilling, it is not possible to prevent the drilled hole from becoming large, and the drilled hole is inclined so as not to widen. In the case of drilling, it is necessary to make a repair. However, in this embodiment, the diameter of the hole drilled from the end near the hole entrance to the bottom is not larger than the diameter D4 of the drill part 4, and the concrete structure. The body C can be drilled straight.

  According to the present embodiment, since the drill body 3 and the drill part 4 are connected via the tapered contact surface, the drill part 4 can be easily attached to and detached from the drill body 3, and replacement is possible. Time and cost can be reduced.

  Furthermore, since the diameter D2 of the shaft portion 32 located inside the hole drilled is smaller than the diameter D4 of the drill portion 4, the end near the hole entrance to be drilled even when it is obstructed by a reinforcing bar or the like during drilling. Drilling straight can be performed without expanding or expanding from the end portion near the hole entrance to the bottom portion to be larger than the diameter D4 of the drill portion 4. For this reason, it is possible to suppress an increase in the filling amount of the injection material injected into the drilled hole, and to avoid the reinforcing bar etc. without refracting the drilled hole from the middle, the same as the hole before reaching the reinforcing bar etc. While maintaining the diameter, the concrete structure C can be perforated in the vertical direction, and the work of repairing the anchor member becomes unnecessary.

  Further, even when the drilling operation is obstructed by a reinforcing bar or the like during drilling, the drilling drill 1 is continued without being pulled out of the drilled hole, and the drilling drill 1 is tilted as it is so as to avoid the reinforcing bar or the like. Therefore, a smooth drilling operation can be performed, and the efficiency of the drilling operation can be improved.

  Although the present invention has been described with reference to the preferred embodiments, various modifications can be made in light of the technology in the technical field without departing from the gist of the present invention. Therefore, the technical scope of the present invention is not limited to the above-described embodiments, but is defined based on the description of the scope of claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Drill for drill 3 Drill main body 31 Shank part 32 Shaft part 33 Dust collection discharge hole 34 Adapter mounting part 35 Tip 36 Mounting part 37 Dust collection hole 4 Drill part 41 Cutting edge part 42 Contact surface 43 Mounting hole 44 Dust collection hole 50 Dust collection adapter C Concrete structure P Rebar

Claims (3)

A drill body;
A drill portion provided at a tip of the drill body;
A dust suction hole extending in the direction of the rotation axis of the drill body from the tip of the drill part,
The drill body is provided with a mounting portion formed in a tapered shape with a small diameter of the drill body toward the tip where the drill portion is provided,
The drill portion is provided with a mounting hole having a contact surface that matches a diameter of the tapered peripheral surface of the mounting portion, and is detachable from the drill body. The drill body is formed with a dust suction discharge hole that is inserted in the dust suction hole and opened in a radial direction,
2. The drill for drilling according to claim 1, wherein a diameter of the drill main body from the mounting portion to the dust suction discharge hole is smaller than a diameter of the drill portion.   When the drill body is positioned inside the hole of the drilled object to be drilled to a size corresponding to the diameter of the drill portion, the drill body and the inner wall surface of the hole of the drilled object to be drilled 2. The drill for drilling according to claim 1, wherein a diameter of the drill main body is formed smaller than a diameter of the drill portion so that a predetermined gap is formed therebetween.

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