JP2016132143A - Improvement in hole saw structure of drill for reinforced concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved hole saw structure of a drill for a reinforced concrete.SOLUTION: A hole saw has: a shank which extends in an axial direction; an insertion step which is formed at a rear end of the shank; a first thread ridge part and a second thread ridge part which are sequentially formed at a tip of the shank at different lead angles; a chip collection chamber which is formed along an axial direction of the second thread ridge part and is opened toward the tip of the shank; plural holes through which the second thread ridge part penetrates in a radial direction and which are communicated with the chip collection chamber; and plural cutting parts which fitted to a tip edge of the second thread ridge part. By a structural design such that concrete chips are guided by use of the lead angle of the second thread ridge part on the basis of a configuration of the above-said components, different drilling efficiencies are generated, whereby a user is warned to perform exchanging with a drill chuck and the drill chick is prevented from abrasion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hole saw structure that warns a user to replace a drill chuck in a timely manner by accumulating chips.

  As shown in FIG. 4, when the conventional concrete wall 20 hits the reinforcing bar 21 in the drilling process in the drilling process, the reinforcing bar 21 cannot be drilled unless it is replaced with a drill chuck for drilling the reinforcing bar 21. After the cutting of 21, the drilling is continued again by exchanging with a drill chuck for drilling the concrete wall 20, thereby completing the drilling of the concrete wall 20.

  However, in the above-described conventional technology, the drill chuck for drilling metal drills the concrete wall 20 before the user notices after cutting the rebar 21, and wears the drill chuck for drilling metal. Service life may be shortened.

  In order to eliminate the above-mentioned drawbacks, the user frequently interrupts the drilling operation, removes the drill chuck for metal drilling, inspects whether the rebar 21 is cut, and then replaces it with another drill chuck as appropriate. . However, repeating inspection and interruption in this way has a great influence on work efficiency and speed.

  Further, the present invention has been made in consideration of the above circumstances, and in order to solve the above problems, the present invention mainly aims to provide an improved hole saw structure for a reinforced concrete drill.

  Therefore, the present inventor considered that the above-mentioned drawbacks can be improved, and as a result of intensive studies, the present inventor has arrived at a proposal of the present invention that effectively improves the above-described problems by rational design.

In order to solve the above-mentioned problems and achieve the object, the improvement of the hole saw structure of the reinforced concrete drill according to the present invention includes an axially extending shank,
A first screw thread portion and a second screw thread portion that are formed in order at the tip of the shank and are formed in order to expand outward in the radial direction;
A chip collection chamber formed in the axial direction along the second thread portion and opened toward the tip of the shank;
A plurality of holes that penetrate the second threaded portion in the radial direction and communicate with the chip collection chamber;
Improvement of the hole saw structure of a drill for reinforced concrete having a blade portion fitted to the tip of the plurality of second thread portions,
Here, the first threaded portion is formed along the outer surface of the first threaded portion and is recessed with a lead angle smaller than 45 degrees with respect to the tip surface of the first threaded portion. It has a waste guide groove,
The second threaded portion is a second plurality of scraps that are recessed along the outer surface of the second threaded portion and at a lead angle greater than 45 degrees with reference to the tip surface of the second threaded portion. Having a guide groove, and one end of each of the second chip guide grooves communicated with the first chip guide groove;
Each of the holes is arranged corresponding to the position of each of the second chip guide grooves.

  According to the present invention, the user does not need to interrupt the drilling operation frequently, and warns the user in a timely manner to change to another drill chuck according to the difference in drilling speed in the operation process.

It is an external appearance perspective view explaining the hole saw which concerns on this invention. FIG. 2 is a schematic diagram of an operation according to the embodiment shown in FIG. 1. It is a partial cross section schematic diagram which shows embodiment shown in FIG. It is the schematic which shows the conventional drill operation | work.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

First embodiment

  Hereinafter, the first embodiment will be described with reference to FIGS. A hole saw 100 according to the present invention has a shank 10 extending in the axial direction, a fitting insertion step 11 formed at the rear end of the shank 10 and connected to a driving tool (not shown), and radially outward. And is formed along the axial direction of the first thread portion 12, the second thread portion 13, and the second thread portion 13 that are sequentially formed at the tip of the shank 10 and toward the tip of the shank 10. The chip collection chamber 14 and the second screw thread portion 13 that are opened are penetrated in the radial direction, and the plurality of holes 131 that communicate with the chip collection chamber 14 and the second screw thread portion 13 are penetrated in the radial direction. A tool hole 132 communicating with the chip collecting chamber 14 is also provided. A plurality of blade portions 15 are fitted on the leading edge of the second thread portion 13.

  The first threaded portion 12 described above has a first chip guiding groove 121 that is spirally recessed along the outer surface of the first threaded portion 12. The first chip guiding groove 121 is disposed with a lead angle smaller than 45 degrees with respect to the tip surface. By arranging at this angle, the concrete chips in the hole 22 are guided and discharged.

  The second threaded portion 13 described above has a plurality of second chip guiding grooves 133 that are spirally recessed along the outer surface of the second threaded portion 13 in parallel. Each of the second chip guiding grooves 133 is arranged with a lead angle larger than 45 degrees with respect to the tip surface. One end of each second chip guide groove 133 is communicated with the first chip guide groove 121. The arrangement at this angle guides and discharges the reinforcing bar chips in the hole 22 but is disadvantageous for guiding and discharging the concrete chips.

  The above-described blade portion 15 is disposed at a position corresponding to each second chip guide groove 133 of the second thread portion 13.

  Moreover, the above-mentioned hole part 131 respond | corresponds to the adjacent location of the outer surface of the 2nd screw thread part 13, and the 2nd chip guide groove | channel 133. FIG.

  Thus, the above is the introduction of each member of the hole saw according to the preferred embodiment of the present invention. Next, the installation method and use features of the present invention will be introduced.

  Further, when the user hits the reinforcing bar 21 in the drilling process of the concrete wall 20, the drilling is continued after replacing the hole saw 100 according to the present invention in a timely manner. In this process, the outer peripheral edges of the first screw thread portion 12 and the second screw thread portion 13 and the inner diameter surface of the hole portion 22 of the concrete wall 20 are bonded together to assist the drilling of the hole saw 100. Moreover, the 1st thread part 12 is arrange | positioned with a lead angle smaller than 45 degree | times, and can discharge | emit the concrete chip in the hole part 22 smoothly. When the blade portion 15 of the second thread portion 13 cuts the rebar 21, the cut reinforcing bar block 211 and the rebar chips (concrete chips) are stored in the chip collecting chamber 14 of the second thread portion 13. The Reinforcing bar chips (concrete chips) generated when the blade portion 15 of the second thread portion 13 cuts the reinforcing bar 21 (or the concrete wall 20) are compressed into each second chip guiding groove. 133 and the first chip guide groove 121 are sequentially discharged from the hole 22. Reinforcing bar swarf (concrete swarf) in the swarf collecting chamber 14 overflows from each hole 131 or tool hole 132 to each second swarf guiding groove 133, and the first swarf of the first thread portion 12. The material is discharged from the hole 22 along the guide groove 121 in order.

  The reinforcing bar chips generated in the cutting process of the reinforcing bar 21 are guided to the first chip guiding groove 121 by the structural design of the lead angle of the second chip guiding groove 133, and the reinforcing bar chips are the second thread portion. 13 and the blade portion 15 are difficult to accumulate. Therefore, the user operates to match the efficiency in the drilling process and there is no clear change.

  If the cutting of the concrete wall 20 is started after cutting the reinforcing bar 21 with the blade portion 15, the structure design of the lead angle of the second chip guide groove 133 is disadvantageous for the guidance of the concrete chip, Debris accumulates at the tips of the second thread portion 13 and the blade portion 15. In the drilling operation process, the user saw a phenomenon in which the hole saw 100 according to the present invention slips and slides or stagnates (decrease in drilling efficiency), so that the drill chuck can be replaced with the user in a timely manner. Warning and ensure that the drill chuck is not worn unnecessarily.

  Further, the reinforcing bar block 211 collected in the chip collecting chamber 14 achieves the purpose of cleaning the reinforcing bar block 211 by allowing the user to insert the tool 3 (a rod having an appropriate diameter) into the tool hole 132. .

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

100: Hole saw 10: Shank 11: Insertion step 12: First thread part 121: First chip guide groove 13: Second thread part 131: Hole 132: Tool hole 133: Second chip guide Groove 14: Chip collection chamber 15: Blade 20: Concrete wall 21: Reinforcing bar 211: Reinforcing bar block 22: Hole part 3: Tool

Claims (2)

A shank stretched in the axial direction;
A first thread portion and a second thread portion that are formed in order at the tip of the shank and that are formed in order to expand radially outward.
A chip collection chamber formed in the axial direction along the second thread portion and opened toward the tip of the shank;
A plurality of holes that penetrate the second threaded portion in the radial direction and communicate with the chip collection chamber;
A blade portion fitted at the tip of the plurality of second thread portions;
Improvement of the hole saw structure of a drill for reinforced concrete having
Here, the first threaded portion is formed along the outer surface of the first threaded portion and recessed with a lead angle of less than 45 degrees with respect to the tip surface of the first threaded portion. It has a scrap chute,
The second threaded portion extends along the outer surface of the second threaded portion and includes a plurality of second cuts recessed at a lead angle greater than 45 degrees with respect to the tip surface of the second threaded portion. Having a scrap guide groove, and one end of each of the second chip guide grooves communicated with the first chip guide groove;
Each said hole part is arrange | positioned corresponding to the position of each said 2nd chip guide groove | channel, respectively, The improvement of the hole saw structure of the drill for reinforced concrete characterized by the above-mentioned.   The hole for a reinforced concrete drill according to claim 1, wherein the second thread portion further has a tool hole that penetrates the second thread portion in the radial direction and communicates with the chip collecting chamber. Improved saw structure.