JPH07276120A - Drilling depth setting tool for drill - Google Patents

Abstract

PURPOSE:To structure a setting tool to set drilling depth of a concrete drill so that the setting tool does not move in the shaft direction because of oscilla tion of a drill blade, etc. CONSTITUTION:This tool is furnished with a main body 3 made of a cylindrical body, an elastic deformable cylindrical wedge 4 the outer periphery of which interfaces with a tapered internal surface 1 of the main body 3 and a screwing body 5 to press fit the cylindrical wedge 4 in the shaft direction in the main body 3. Consequently, it is possible to fasten and fix the main body 3 on the outer periphery of a drill blade 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling depth setting tool which is mainly attached to a drill blade of a concrete drill, and the setting tool is to be moved by an impact or the like applied in the axial direction of the drill blade during drilling. Regarding what was prevented.

[0002]

2. Description of the Related Art The applicant of the present invention has already disclosed in Japanese Utility Model Laid-Open No. Sho 63-1692
No. 05 concrete drilling hole depth setting jig is proposed. This is provided with a fitting portion for elastically fitting to the outer peripheral portion of the drill, and a flexible dust removing portion extending in the radial direction from the fitting portion.

[0003]

The drill blade of the concrete drill vibrates in the axial direction, and
It rotates around its axis. Therefore, since the axial impact is constantly applied to the drill blade, the drilling depth setting jig held by the drill blade easily moves in the axial direction. Furthermore, when the final depth of the drilling is reached, the jig abuts the concrete surface, which tends to move axially upward. Then, there is a drawback that the set value of the perforation depth tends to become gradually longer. Therefore, an object of the present invention is to solve such a problem, and for that purpose, the following configuration is adopted.

[0004]

A drilling depth setting tool of a drill according to the present invention has a tapered inner surface 1 whose cross section is gradually reduced toward one end side in the axial direction, and a thread 2 is formed at the other end. A main body 3 formed of a tubular body, a tubular wedge 4 that is inserted into and removed from the main body 3 and has an outer periphery that matches the tapered inner surface 1, and is elastically deformed in a radial direction; A hollow threaded body 5 that is detachably screwed to the thread 2 and that presses the cylindrical wedge 4 axially in the main body 3 in accordance with the amount of threading in the axial direction. The main body 3, the tubular wedge 4, and the screw body 5 are configured so that the drill blades 8 pass through them, respectively. Further, preferably, the threaded body 5 is a nut having an inner collar 6, and the threaded body 5 is the main body 3
It is configured to be screwed to the thread 2 formed on the outer circumference of the cylindrical wedge 4 so that the axial end surface of the cylindrical wedge 4 contacts the inner flange 6. Alternatively, the threaded body 5 is formed in a tubular shape having an external thread 7 on the outer periphery, and the tubular wedge 4 is integrally projectingly provided at one end thereof, and the external thread 7 is attached to the main body 3. It is configured to be screwed to the screw thread 2 formed of an inner screw formed on the inner surface.

[0005]

The drill depth setting tool of the present invention is formed so that the drill blade 8 penetrates through the main body 3, the cylindrical wedge 4 and the screw body 5, respectively. Since the cylindrical wedge 4 is configured to be press-fitted in the axial direction in the main body 3 by being screwed to the main body 3, the main body 3 should be securely fastened and fixed to the outer periphery of the drill blade 8 through the cylindrical wedge 4. You can Thereby, the main body 3 can be prevented from moving axially upward during perforation, and a highly reliable setting tool can be provided. That is, according to the present setting tool, it is possible to accurately set the drilling depth.
Moreover, it is possible to freely change the setting position.

[0006]

EXAMPLES Next, examples of the drilling depth setting tool of the present invention will be described. FIG. 1 is an exploded perspective view of a first embodiment of a drilling depth setting tool of the present invention, FIG. 2 is a perspective view showing its usage state, and FIG. 3 is a longitudinal sectional view thereof. The setting tool of this embodiment includes a main body 3 made of a tubular body, a tubular wedge 4 and a screw body 5. The main body 3 has a dust removing portion 11 protruding from the outer periphery of one end thereof. Although only one dust removing part 11 is projected in the radial direction in this embodiment, a plurality of dust removing parts 11 may be provided so as to be separated from each other in the circumferential direction. Further, the dust removing unit 11 may be integrated with the main body 3 or may be manufactured separately and combined. On the other end of the outer periphery of the main body 3, a screw thread 2 made of an external screw is formed. Further, as shown in FIGS. 1 and 3, the inner surface of the main body 3 is formed with a tapered inner surface 1 whose cross section is gradually reduced toward one end side in the axial direction.

Next, the cylindrical wedge 4 provided with an outer periphery that matches the tapered inner surface 1 is formed in a truncated cone shape as a whole, and a slit 9 and a notch 10 are formed in the radial direction thereof. The slit 9 is provided over the entire thickness of the cylindrical wedge 4, and the wedge has a C-shaped cross section. Further, the cutout portion 10 is formed on the outer periphery while leaving a part of the wall thickness. As a result, the cylindrical wedge 4
Is elastically deformable in a radial direction. Further, the cylindrical wedge 4 is formed such that, when it is fitted in the tapered inner surface 1 of the main body 3, the upper end of the cylindrical wedge 4 projects from the main body 3. Next, the threaded body 5 has an inner screw threaded to the thread 2 that forms an outer thread of the main body 3, and is formed in a tubular shape having an inner collar 6 at the upper end. The lower surface of the inner collar 6 has a cylindrical wedge 4
Abut the upper surface of.

The perforation depth setting tool of the first embodiment thus constructed is, as shown in FIGS. 2 and 3, a main body 3, a cylindrical wedge 4,
The screw body 5 is inserted from the rear end of the drill blade 8. And
The lower edge position of the main body 3 is adjusted so that the drilling depth of the drill blade 8 becomes a desired value. Then, the cylindrical wedge 4 is attached to the taper inner surface 1 of the main body 3, and the threaded body 5 is screwed and fastened to the thread 2 of the body 3. Then, as the screw body 5 moves in the axial direction, the cylindrical wedge 4 moves to the tip of the drill blade 8 via the inner flange 6. Then, the inner diameter of the tubular wedge 4 is reduced, and the tubular wedge 4 is
And the drill blade 8 is securely fastened. As a result, the main body 3 is fastened and fixed to the drill blade 8 via the tubular wedge 4 and the screw-attaching body 5, and the state is reliably maintained. This drill blade 8 is for a concrete drill, and its upper end is attached to a concrete drill, that is, a vibration drill. This vibrating drill normally rotates while vibrating in the vertical direction, and is subjected to a strong axial impact.

However, the perforation depth setting tool of the present invention is
The presence of the tubular wedge 4 ensures that the main body 3 is bitten on the outer periphery of the drill blade 8 so that it does not move axially during use. When the depth of perforation on the concrete surface reaches a predetermined value, the lower surface of the main body 3 contacts the concrete surface. At this time, the dust removing part 11 removes the perforated waste discharged on the concrete surface to the outer periphery to facilitate the perforation work. Next, FIGS. 4 to 6 show a second embodiment of the present invention, in which the screw attachment body 5 and the cylindrical wedge 4 are integrally formed. The thread 2 of the main body 3 is formed as an inner thread. At the same time, the outer screw 7 is attached to the outer circumference of the intermediate portion of the screw body 5.
Is provided. That is, the main body 3 is formed in a tubular shape, the thread 2 formed of an internal screw is formed on the inner surface of the upper end portion thereof, and the tapered inner surface 1 is provided on the rear end portion thereof as shown in FIG. Further, the threaded body 5 has a hexagonal cross-section outer periphery so that the upper end thereof can be rotated by a spanner or the like.

However, instead of the hexagonal outer circumference, another polygonal shape or a circular shape and knurling for slip prevention may be provided on the outer circumference. In any case, the main body 3 and the screwed body 5
It suffices that the space between and is formed so as to be rotatable relative to each other. An external screw 7 is provided at an intermediate portion of the screw body 5, and the external screw 7 is screwed in alignment with the thread 2 formed on the inner surface of the upper end portion of the main body 3. A cylindrical wedge 4 is provided at the lower end of the screw body 5, and four slits 9 are formed on the outer circumference thereof, whereby the cross-sectional outer circumference of the cylindrical wedge 4 is formed to be expandable and contractible. In this embodiment, as shown in FIG. 6, the threaded body 5 is screwed onto the body 3 so that the cylindrical wedge 4 integrated with the threaded body 5 is pressed against the tapered inner surface 1 of the body 3 and the tube The inner circumference of the cross section of the shaped wedge 4 is reduced, and the outer circumference of the drill blade 8 inserted inside is wedged. Thereby,
The body 3 and the drill blade 8 are positioned via the screw body 5.

Next, in FIG. 7, in the first and second embodiments, when the outer circumference of the drill blade 8 is significantly smaller than the through hole of the setting tool, the setting tool is drilled through the spacer 13. It can be attached to 8. That is, the inner circumference of the spacer 13 substantially matches the outer circumference of the drill blade 8 and the outer circumference of the spacer 13 substantially matches the through hole of the setting tool. Then, the spacer 13 is mounted by mounting the setting tool of the present invention in a state as shown in FIG. 7 and screwing the screw body 5 to the main body 3.
This setting tool is fixed to the drill blade 8 via.
With this configuration, spacers 13 with various inner diameters
Can be provided, it is possible to provide a drilling depth setting tool for the drill blade 8 according to each inner diameter. Although each component of the present setting tool can be formed of a plastic material or a metal material, it is preferable that the material of the cylindrical wedge 4 be softer than the material of the outer circumference of the shaft portion of the drill blade 8. When the spacer 13 is used, it is sufficient if only the spacer 13 is made of a material softer than the drill blade 8.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a drilling depth setting tool of the present invention.

FIG. 2 is a perspective view showing a usage state of the setting tool.

FIG. 3 is a vertical cross-sectional view showing the same usage state.

FIG. 4 is an explanatory view of a second embodiment of the punch depth setting tool of the present invention.

FIG. 5 is a perspective view showing a usage state of the embodiment.

FIG. 6 is a vertical cross-sectional view showing the same usage state.

FIG. 7 is an explanatory view showing another example of use of the perforation depth setting tool of the present invention.

[Explanation of symbols]

 1 Taper inner surface 2 Screw thread 3 Main body 4 Cylindrical wedge 5 Threaded body 6 Inner collar 7 Outer screw 8 Drill blade 9 Slit 10 Notch portion 11 Dust removal portion 12 Blade edge 13 Spacer

Claims (3)

[Claims] 1. A main body 3 comprising a cylindrical body having a tapered inner surface 1 whose cross-section is gradually reduced toward one end side in the axial direction, and a thread 2 being formed at the other end thereof, and detachable from the main body 3. A cylindrical wedge 4 that is internally mounted, has an outer periphery that matches the tapered inner surface 1, and elastically deforms in the radial direction, and is detachably screwed to the thread 2 of the main body 3 and is screwed in the axial direction. A hollow threaded body 5 for press-fitting the cylindrical wedge 4 in the main body 3 in the axial direction according to the amount of wear, and drilling into the main body 3, the cylindrical wedge 4 and the threaded body 5, respectively. A drilling depth setting tool for a drill configured so that the blade 8 penetrates. 2. The screw attachment body 5 according to claim 1, wherein the screw attachment body 5 is a nut having an inner collar 6, and the screw attachment body 5 is the main body 3
A setting tool configured to be screwed onto the thread 2 formed on the outer circumference of the cylindrical wedge 4 so that the axial end surface of the cylindrical wedge 4 contacts the inner flange 6. 3. The threaded body 5 according to claim 1, wherein the threaded body 5 is formed in a tubular shape having an outer thread 7 on an outer periphery thereof, and the tubular wedge 4 is integrally provided at one end of the threaded body 5. A setting tool configured such that the outer screw 7 is screwed to the thread 2 made of an inner screw formed on the inner surface of the main body 3.