JP3075793U - Drilling tool - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When making a relatively large hole in a soft board made of foamed polystyrene or the like, using a cylindrical cutter makes it easy for the cut cylindrical scrap to be clogged in the cylinder, and the cutting edge is saw-shaped. With the hole saw, there was a problem that the surface of the soft board was easily peeled, and it was difficult to make a clean hole. SOLUTION: A side surface of a steel pipe is cut out between a cutting blade portion 1a having a flat blade edge and a head 4 provided at an opposite end thereof, and a support beam 1 is provided between the cutting blade portion 1a and the head 4.
b, drilling tools connected by 1b.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a drilling tool used to make a relatively large hole in a soft board such as expanded polystyrene.

[0002]

[Prior art]

 When making relatively large holes in a soft board such as expanded polystyrene, a cylindrical hole saw with a saw-shaped edge or a drill with a hand-held handle attached to a cylindrical cutter with a sharpened edge and a cutting edge is generally used. Is used regularly.

[0003]

[Problems to be solved by the invention]

 However, with the conventional hole saws and cutters described above, it is difficult to remove cylindrical scraps cut out when drilling holes in the cylinder and it is difficult to remove them.In the case of a hole saw, a soft board with a saw-shaped blade is used. Since holes were drilled so that they could be stripped, there was a problem that holes could not be made cleanly and chips increased.

The present invention has been made in order to solve the above-mentioned problem, and an object of the present invention is to make it easy and reliable to make a hole in a soft board, and to make the hole clear and cut out. The purpose is to facilitate scrap removal.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the drilling tool according to the present invention includes: (1) The tip of a cylindrical steel pipe is flattened, and the outer diameter of a steel pipe adjacent to the tip is tapered so that the cutting edge portion 1a is formed. The other end of the steel pipe is used as a head 4. A screw hole 1c is provided at the center of the head 4 toward the tip of the steel pipe. The section 1a and the head 4 are connected by two support beams 1b and 1b, and the width of the support beams 1b and 1b is made smaller by making the cutting edge 1a narrower than the head 4. The crap can be easily removed from the drilling tool 1. In drilling, the head 4 receives a larger torque than the cutting edge 1a. Therefore, the width of the support beams 1b and 1b of the head 4 should be wider than that of the cutting edge 1a. Thus, the strength of the drill 1 can be increased. Cutting out a part of the side surface of the steel pipe has the effect of reducing frictional resistance during drilling. (2) When the cone 2 is attached to the screw hole 1c provided at the center of the side surface of the head 4, a hole is simultaneously formed in a soft member such as expanded polystyrene and a slightly hard member such as a plywood. This is convenient when drilling assembly holes in a formwork with an insulating material such as expanded polystyrene interposed. (3) When the guide rod 5 is attached to the screw hole 1c provided on the side surface of the head 4, misalignment can be prevented when a hole is made in polystyrene foam or the like.

[0006]

[Embodiment of the invention]

 An embodiment of the invention will be described with reference to the drawings. In FIG. 1, a drilling tool 1 according to the present invention has a sharp cutting edge formed by flattening the tip of a cutting edge 1a at one end of a cylindrical steel pipe and tapering the outer diameter thereof. The cylindrical side surface of the steel pipe is largely cut out and removed, leaving the cutting edge portion 1a and the head 4 at the other end of the steel pipe, so that the cutting edge portion 1a and the head 4 are connected to two support beams 1b, 1b. In a state where they are connected with each other.

The supporting beams 1b and 1b are formed by cutting out the side surface of a steel pipe so that the width of the cutting edge portion 1a is slightly smaller than that of the head 4, thereby reducing frictional resistance when drilling. The cut-out cylindrical scrap can be easily removed from the drilling tool 1. In drilling, the head 4 receives a larger torque than the cutting edge 1a, so that the width of the support beams 1b and 1b of the head 4 is larger than that of the cutting edge 1a. This has the effect of increasing the strength of the drill 1.

The shank 3 is attached to the head 4. The shank 3 is of a hexagonal pit type, and can be used not only for a collet chuck but also for an impact wrench. The drill 1 can be mounted on a chuck of an electric tool (not shown) such as the above.

FIG. 2 shows a state in which the cone 2 is attached to a screw hole 1 c provided at the center of the head 4. When drilling holes simultaneously with foamed polystyrene and plywood, such as when assembling a formwork with a plywood with a heat insulating material such as foamed polystyrene, etc., when the drill 2 is attached to the drilling tool 1 and drilled, for example, This is convenient when drilling assembly holes in a formwork with thermal insulation interposed.

FIG. 3 is a perspective view of the cone 2. A part of the handle of the cone 2 was cut off and made flat next to the blade part of the cone 2, and a spanner hook 2a was provided. The cone 2 is provided for convenience when attaching and detaching the screw portion 2b to and from the screw hole 1c.

FIG. 4 is a side view of the guide rod 5. When the guide rod 5 is attached to the screw hole 1c and the drilling operation is performed with the drilling tool 1, the misalignment hardly occurs.

[0012]

[Effect of the invention]

 (1) With the drilling tool 1 of the present invention, in addition to foamed polystyrene or foamed polyurethane, a soft board made of foamed polyurethane or the like is not peeled off by the cutting edge, and no chips (saw chips) are generated. You can open it. (2) The cut-out scrap can be easily removed from the drilling tool 1 without being clogged in the cylinder of the drilling tool 1. (3) Since drilling work is performed by attaching to a power tool, fatigue is reduced and work speed is increased. (4) Abrasion resistance can be significantly reduced by cutting out and removing the side of the steel pipe from both sides. (5) The drill 2 and the soft board can be simultaneously drilled by mounting the cone 2. (6) By mounting the guide rod 5, misalignment when drilling holes can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of the drilling tool of the present invention.

FIG. 2 is a perspective view of a drilling tool equipped with a cone.

FIG. 3 is a perspective view of a cone.

FIG. 4 is a side view of a guide rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling tool 1a Cutting blade part 1b Support beam 1c Screw hole 2 Cone 2a, 5a Spanner hook 2b, 5b Screw part 3 Shank 4 Head 5 Guide rod

Claims (3)

[Utility model registration claims] 1. A cutting edge 1a is formed by flattening the tip of a cylindrical steel pipe and tapering the outer diameter of a portion adjacent to the tip, and the other end of the steel pipe is used as a head 4. At the center of 4, a screw hole 1c is provided toward the tip, and the side of the steel pipe is cut out largely from both sides and removed, and the cutting blade 1a and the head 4 are connected by two support beams 1b, 1b. A drilling tool characterized in that the width of the support beams 1b and 1b is smaller in the cutting blade 1a than in the head 4. 2. The drilling tool according to claim 1, wherein the cone 2 is screwed into the screw hole 1c. 3. The drilling tool according to claim 1, wherein the guide rod 5 is screwed into the screw hole 1c.