JPH0929523A - Drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill capable of drilling a hole in a concrete wall, and continuously cutting a through hole of the diameter larger than that of a hole in wood. SOLUTION: A cutting blade 13 and a chip discharging groove 14 following the blade are provided on one end of a circular shaft body 12, a holding part 15 for a tool, etc., is provided on the other end of the body 12, and a projected cutting part 16 is provided at the position close to the terminal of the chip discharging groove 14 on the outer surface of the circular shaft body 12 to drill a hole in a concrete wall by the cutting blade 13 and achieve the continuous cutting of a through hole of large diameter in wood.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill, and more specifically, a drill for continuously drilling holes in wood, etc. and a concrete wall surface for inserting the fastener when the wood etc. are attached to the concrete wall surface by a fastener. Regarding

[0002]

2. Description of the Related Art As shown in FIG. 8 (A), a plug 1 and a screw 2 are used in a method of attaching a wood B to a concrete wall surface A.
There is known a mounting method using the fastener 3 composed of a combination of.

The plug 1 is formed of a synthetic resin in a circular shaft shape and has a structure having a center hole 4 which is eccentric along the axial direction. Further, as shown in FIG.
Is the diameter of the thread 2a is larger than that of the central hole 4 and the plug 1
It is slightly smaller than the outer diameter of.

In order to attach the wood B to the concrete wall surface A by using the fastener 3, first of all, a conventionally known circular axis drill is used for the concrete wall surface A,
A hole 5 having an inner diameter into which the plug 1 is fitted is bored, and a through hole 6 is bored in a wood B to be attached next by using a drill having a diameter larger than that used for concrete. The wood B is applied to the concrete wall surface A, the plug 1 of the fastener 3 is inserted into the hole 5 of the concrete wall surface A through the through hole 6 of the wood B, and then the center hole 4 of the plug 1 is inserted.
The screw 2 is screwed in and the screw thread 2a is bitten over both the plug 1 and the concrete A, whereby pull-out strength is obtained and the wood B is fixed by pressing the wood B by the head 7.

[0005]

In the conventional mounting method using the plug 1 as described above, since the holes 5 and the through holes 6 in the concrete wall surface A and the wood B have different diameters, two types of drills are required. Since it must be used, the work efficiency is poor because the drilling work is performed twice, and the fastener cannot be inserted unless the positions of the hole 5 of the concrete wall surface A and the through hole 6 of the wood B are accurately aligned. There's a problem.

[0006] In addition, if the fastener is to be used by making a through hole with one type of drill, there is a problem that a plug having a length including the thickness of the wood B must be prepared.

By the way, in this type of fastener 3, since the axial centers of the plug 1 and the screw 2 which are first inserted into the concrete wall are deviated, the maximum diameter X of the two parts is as shown in FIG. 8B. Will exceed the diameter Y of the plug. Therefore, the concrete wall B where the plug 1 is inserted first
When a hole is continuously drilled from the top of the wood B toward the concrete wall surface using only one type of drill having a diameter suitable for the hole 5, the wood hole diameter is larger than the maximum diameter X part. Due to its small size, there is a problem that the plug 1 part can be inserted, but the screw 2 part cannot be inserted into the hole of the wood. The same problem also occurs when the plug 1 has a structure having a flange at the upper end. Therefore, the through hole 6 of the wood B must be formed with a larger diameter than the hole 5 provided in the concrete wall surface A.

Therefore, an object of the present invention is to continuously perforate a hole having a large diameter on the side of wood or the like in a wall of concrete or the like on a piece of wood or the like piled up on a wall surface of concrete or the like. To provide a drill.

[0009]

In order to solve the above problems, the invention of claim 1 provides a cutting blade and a chip discharge groove following it at one end of a circular shaft-shaped main body, and a tool etc. at the other end. Is provided and a projecting cutting portion is provided near the end of the chip discharge groove.

According to a second aspect of the present invention, in the first aspect of the present invention, the cutting blade has a structure in which the outer diameter has a large-diameter portion and a small-diameter portion located on the tip side of the large-diameter portion.

According to a third aspect of the present invention, in the first aspect of the present invention, the cutting blade is formed of a chip made of a plate-shaped hard material having a wide width portion and a sharp narrow width portion located on the tip side thereof,
The chip is fixed to one end of a circular body.

According to a fourth aspect of the present invention, in the first to third aspects of the invention, the protruding cutting portion is composed of two wing-shaped protrusions.

According to a fifth aspect of the invention, in the fourth aspect of the invention, the wing-shaped projection has a tapered portion that gradually increases from the front end toward the rear end.

According to a sixth aspect of the present invention, in the first to third aspects of the invention, the protruding cutting portion is composed of a plurality of protrusions that are long in the axial direction of the circular shaft-shaped main body.

According to a seventh aspect of the invention, in the fourth to sixth aspects of the invention, the protruding cutting portion is inclined with respect to the axial direction of the circular shaft-shaped main body.

According to the present invention of claim 8, the chip discharge groove is extended to the protruding cutting portion.

According to a ninth aspect of the present invention, in the first to eighth aspects of the invention, the holding portion for the tool is a hexagonal column.

A tenth aspect of the present invention is the invention of the first to eighth aspects, in which a mechanism for adjusting the depth of perforation is provided between the protruding cutting portion and the holding portion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described together with illustrated examples.

As shown in FIGS. 1 and 2, the drill 11 is provided with a cutting blade 13 and a chip discharge groove 14 following it at one end of a circular shaft-shaped body 12 and a holding portion 15 for a tool or the like at the other end. At the same time, a protruding cutting portion 16 is provided near the end of the chip discharge groove 14.

The chip discharge groove 14 has a circular shaft-shaped body 12
Is formed by providing a spiral groove in the outer peripheral surface of the drill 11 in a range from one end side to a position of a substantially middle portion of the entire length of the drill 11, and a holding portion 15 for holding a tool or the like at the other end of the circular shaft-shaped main body 12. Are formed in a cylindrical shape in addition to the hexagonal pillar shown in FIG.

The cutting blade 13 is made of a plate-shaped hard material,
Wide part 17 having a width substantially equal to the diameter of the circular shaft-shaped main body 12
It is formed in a two-stage chip having a sharp narrow width portion 18 at the tip thereof, and the wide width portion 17 is inserted into a cut provided at one end of the circular shaft-shaped main body 12 and fixed by welding.

The cutting blade 13 has, in addition to the tip as shown in the drawing, a circular shaft-shaped two-step shape having a large diameter portion corresponding to the wide width portion 17 and a small diameter portion corresponding to the narrow width portion 18, and is provided on the outer surface thereof. It is also possible to employ a structure in which a cutting blade is formed at the peripheral edge of the concave groove, and such a circular shaft-shaped two-stage cutting blade has a circular shaft-shaped main body 12
Even if a separate member is fixed to the tip of the, the tip of the circular shaft-shaped main body 12 can be directly formed by cutting.

The protruding cutting portion 16 is shown in FIGS. 1 and 2 (B).
In the case of the example shown in FIG. 6 (A), two wing-shaped projections 16a are provided on the outer peripheral surface of the circular shaft-shaped main body 12 near the end of the chip discharge groove 14 on both sides of the axial center of the main body 12. The wing-shaped projection 16a is formed by welding and fixing it to the rear end of the wing-shaped projection 16a.

In the example shown in FIG. 6B, the protruding cutting portion 16 is formed by a plurality of protrusions 16b having a length in the axial direction of the circular shaft-shaped main body 12, and the protrusions 16b are circular shafts. Although it may be linear in the axial direction of the cylindrical main body 12, it may be inclined with respect to the axial direction of the circular main body 12 as shown in FIG.

The cutting blade 13 is for drilling the concrete wall surface A, and the distance from the tip of the cutting blade 13 to the tip of the protruding cutting portion 16 is the same as that of the plug 1 of the fastener 3 shown in FIG. It is set so as to correspond to the length, has a perforation depth for the concrete wall surface A, and the width of the wide portion 17 of the cutting blade 13 is set so as to correspond to the diameter of the plug 1.

The protruding cutting portion 16 is a cutting portion for boring the through hole 6 in the wood B, and is a hole drilled in the concrete wall surface A by the height amount protruding from the outer surface of the circular shaft-shaped main body 12. The through hole 6 having a diameter larger than 5 is formed.

FIG. 3 shows the protruding cutting portion 16 of the circular shaft-shaped main body 12.
It shows the one using the depth adjusting mechanism 20 mounted between the holding portion 15 and the holding portion 15. The adjusting mechanism 20 includes a ring-shaped main body 21 that is externally fitted to the circular main body 12 so as to be movable in the axial direction, and a set screw 22 for fixing the main body 21 at a desired position. It is configured. Circular shaft body 12
A flat surface 23 for preventing rotation, against which the tip of the set screw 22 abuts, may be provided on the outer surface of the. Can be adopted.

By setting the distance between the tip surface of the ring-shaped body 21 and the tip of the protruding cutting portion 16 to match the plate thickness of the wood B, the amount of penetration of the drill 11 when drilling is limited.

That is, from the top of the wood B to the concrete wall A
When the large-diameter through-hole 6 is formed in the wood B by the protruding cutting portion 16 when the drill 11 is drilled toward, the ring-shaped main body 21 contacts the surface of the wood B and stops the drill 11 from entering. As a result, it is possible to prevent the protruding cutting portion 16 from being strongly pressed by the concrete wall surface A and being worn.

FIG. 7 shows a further different example of the protruding cutting portion 16. This protruding cutting portion 16 is closer to the end of the chip discharge groove 14 in the circular shaft-shaped main body 12 than the portion where the discharge groove 14 is provided. Also has a large diameter, and this large diameter portion has a chip discharge groove 14
It is formed by extending. The holding portion 15 has a circular shaft shape in FIG. 7.

The drill of the present invention has the above-mentioned structure, and is used for drilling when fixing the wood B to the concrete wall surface A by using the fastener 3 shown in FIG. 8 (A).

The drill 11 is attached to the rotary tool at the holding portion 15, the concrete wall A is overlapped with the wood B, and the drill 11 rotated from above the wood B is used to start drilling.

In the rotating drill 11, first, the wood B is perforated by the cutting blade 13 at the tip with a diameter corresponding to the width of the wide portion 17, and the chip discharge groove 14 discharges the cutting waste to the outside.

Next, the cutting blade 13 reaches the concrete wall surface A when penetrating the wood B, pierces the concrete wall surface A, and the protruding cutting portion 16 reaches the wood B as the drill 11 enters and cuts the wood wall B. A hole having an inner diameter corresponding to the maximum rotation diameter of the portion 16 is bored in the wood B.

As described above, when the hole 5 is formed in the concrete wall surface A by the cutting blade 13, the protruding cutting portion 16 simultaneously forms the through hole 6 having a larger diameter than the hole 5 in the wood B.

As shown in FIG. 3, when the depth of the drill 11 progresses and the depth adjusting mechanism 20 comes into contact with the surface of the wood B, the protruding cutting portion 16 inserts the through hole 6 through the wood B in the plate thickness direction. At the same time as cutting, the concrete wall surface A is provided with a hole 5 having a diameter and a length in which the plug 1 is fitted.

After removing the drill 11 from the hole 5 and the through hole 6, the plug 1 is inserted into the hole 5 through the through hole 6 as shown in FIG.
When the screw 2 is inserted into the center hole 4 of the plug 1 and the screw thread 2a of the screw 2 is inserted into the plug 1 and screwed into the plug 1 and the concrete wall surface A, a strong anchor effect is obtained. As shown in FIG. 5, the wood B is clamped and fixed to the concrete wall surface A by the head portion 7, as shown in FIG.

[0039]

As described above, according to the present invention, the drilling of a hole in a concrete wall surface and the cutting of a through hole having a diameter larger than that of a hole in wood etc. are carried out in one step using one type of drill. With this, the work efficiency can be greatly improved, and since the hole and the through hole are coaxial with each other and no positional deviation occurs, the fastener can be inserted without any trouble.

[Brief description of drawings]

1A is a front view of a drill, FIG. 1B is a side view of the same, FIG.
(C) is a perspective view of the drill, (D) is a plan view, and (E) is a bottom view.

2A is a sectional view taken along the line aa in FIG. 1A,
(B) is a cross-sectional view of the arrow bb, (C) is a cross-sectional view of the arrow cc, and (D) is a cross-sectional view of the arrow dd.

FIG. 3 is a vertical cross-sectional view showing a state during drilling with a drill.

FIG. 4 is a vertical sectional view showing a state in which a fastener is inserted into a hole.

FIG. 5 is a vertical sectional view showing fixing of wood to a concrete wall surface with a fastener.

6A is an enlarged front view showing a protruding cutting portion of a drill, and FIG. 6B is an enlarged front view showing another example of the same.

FIG. 7 is a front view of a drill showing still another example of the protruding cutting portion.

FIG. 8A is a vertical cross-sectional view showing a conventional construction example using a fastener, and FIG. 8B is a plan view showing a relationship between a plug and a screw.

[Explanation of symbols]

 1 Plug 2 Screw 3 Fastener 4 Center Hole 5 Hole 6 Through Hole 11 Drill 12 Circular Shaft Body 13 Cutting Blade 14 Chip Discharge Groove 15 Holding Part 16 Projection Cutting Part 17 Wide Part 18 Narrow Part 19 Tapered Part 20 Depth Adjustment Mechanism 21 Ring-shaped body 22 Set screw A Concrete wall surface B Wood

Claims (10)

[Claims] 1. A cutting blade and a swarf discharge groove following it are provided at one end of a circular shaft-shaped body, a holding portion for a tool is provided at the other end, and a protruding cutting portion is provided near the end of the swarf discharge groove. Drill. 2. The drill according to claim 1, wherein the cutting blade has an outer diameter of a large diameter portion and a small diameter portion located on the tip side of the large diameter portion. 3. The cutting blade is formed of a chip made of a plate-shaped hard material having a wide width portion and a sharp narrow width portion located on the tip side thereof, and the tip is fixed to one end of a circular shaft-shaped main body. The drill according to Item 1. 4. The drill according to claim 1, wherein the protruding cutting portion is composed of two wing-shaped projections. 5. The drill according to claim 4, wherein the wing-shaped projection has a tapered portion that gradually increases from the front end toward the rear end. 6. The drill according to claim 1, wherein the protruding cutting portion is composed of a plurality of protrusions that are long in the axial direction of the circular shaft-shaped main body. 7. The drill according to claim 4, wherein the protruding cutting portion is inclined with respect to the axial direction of the circular shaft-shaped main body. 8. The drill according to claim 1, wherein the chip discharge groove extends to the protruding cutting portion. 9. The drill according to claim 1, wherein a holding portion for a tool or the like has a hexagonal column shape. 10. The drill according to claim 1, further comprising a mechanism for adjusting a depth of drilling provided between the protruding cutting portion and the holding portion.