JPH09285907A - Multistage type drill and electric drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely bore holes with a plural kinds of diameters by means of a signal drill by forming a multistage type drill so that its diameter is minimized in the tip part and is steppedly increased toward the base end side. SOLUTION: A drill part 1A serving as a center drill in the tip part is provided with a minimum diameter, and toward the base, the diameters of respective drill parts are steppedly increased. For boring a hole AS with a diameter of 10mm in a metallic plate ST, a stopper 5 with a scale is adjusted in a scale position for 10mm so as to be fixed by means of a fastening screw 4A, and then, a multistage type drill 1 is rotated so as to carry out drilling. When drilling progresses to a drill part 1C in the third stage of a diameter for 10mm, a tip part 5A of the stopper 5 collides against the metallic plate ST so as to stop the drill 1 from advancing. In this way, rationalization and labor saving in drilling can be accomplished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill which is attached to an electric drill, a drilling machine or the like to make holes in various metal plates,
The present invention relates to an electric drill using this drill.

[0002]

2. Description of the Related Art When an electric drill having a small motor output is used to make a relatively large hole of, for example, about 10 mm to 13 mm, suddenly when a drill for 10 mm to 13 mm is used, the cutting resistance becomes large. Since the work becomes difficult, first use a small-diameter center drill to drill a center hole in the center of the part to be drilled first, then
The finished main hole is made at the center hole with a large diameter drill.

[0003]

Therefore, when drilling a hole having a large diameter as described above, at least two kinds of drills, a center drill and a drill having a predetermined diameter, are required. Since it is necessary to open the center hole and the main hole in order while exchanging one by one, there is a problem that the work is very troublesome and it takes time to open the hole.

In addition, when drilling holes of different sizes, such as at the work site, in addition to the above center drill, prepare drills of multiple diameters in advance and use them while exchanging them appropriately. Since it was indispensable, drilling work became more and more troublesome.

On the other hand, the hole of about 10 mm to 13 mm described above can be easily drilled without using a troublesome drill replacement by using a small-sized dedicated drilling machine, but in the case of drilling a hole having a size larger than a predetermined size. However, since the drilling machine itself must be replaced each time, there is a problem that the work becomes more complicated.In addition, the drilling machine itself is large and heavy, so there is also a problem that it cannot be easily used by bringing it to the work site. there were.

Although it is possible to make a large hole having a diameter of 13 mm or more by using a large electric drill equipped with a large motor, increasing the size of the motor increases the weight and the reaction force, which increases the workforce. Since it becomes unbearable to hold the electric drill itself, drilling with the electric drill is limited to about φ13 mm, and it has not been used for drilling any more.

Therefore, the technical problem of the present invention is that it is possible to easily make a relatively large hole with a small cutting resistance by using one drill, and without using a plurality of drills having different diameters. However, it is to be able to freely drill holes of plural kinds of diameters with one drill.

[0008]

[Means for Solving the Problems] Means taken in the present invention for solving the above technical problems are as follows.

(1) The tip of the drill has the smallest diameter,
Form in multiple stages so that the thickness gradually increases as it goes to the root end side.

(2) Each step of the multi-stage drill is formed in a tapered surface.

(3) In the electric drill equipped with the multi-stage drill described in (1) or (2) above, a stopper with a scale for determining the diameter of the drill is provided in parallel with the multi-stage drill, and slide adjustment is performed. Install freely.

According to the means described in the above (1), the thinnest cutting edge functions in the same manner as the center drill, firstly making a hole of a small diameter, and then at each of the multi-staged drill parts. Since it is possible to make a large hole gradually with the same cutting resistance as when making a small hole, even with a large diameter hole that could not be drilled with a handy type electric drill or a small dedicated drilling machine, it is relatively easy with a small motor output In addition, it is possible to open in a short time.

According to the means described in the above (2), since the stepped portions of each drill formed in multiple stages are formed on the tapered surfaces respectively, unnecessary load at the stepped portions is reduced,
With a relatively small cutting resistance, it is possible to transfer the drilling to the next stage drill part, and even with a large hole that could not be drilled with a handy type electric drill or a small dedicated drilling machine, it is easy with a small motor output In addition, it is possible to open in a short time.

According to the means (electrical drill) described in the above (3), it is possible to stop the drilling by the multistage drill at the drill portion having the determined diameter by slidingly adjusting the graduated stopper. By using the multi-stage drill, it is possible to freely drill holes of different sizes, and greatly improve the efficiency of drilling work compared to conventional electric drills that perform drilling while exchanging multiple drills. Can be fulfilled.

As described above, the above (1) to (1)
The technical problem described above can be solved by the means described in (3), and the problem of the conventional technology can be solved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a multistage drill and an electric drill according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view illustrating the configurations of a multi-stage drill and an electric drill according to the present invention, and FIG. 2 is a configuration diagram illustrating the multi-stage drill and the shape of shavings according to the present invention. As shown in FIG. 2, the drill 1 has a cutting edge portion 1A, which plays the role of a center drill, having the smallest diameter, and then 1B, 1C, 1D, 1E, 1
F, 1G, 1H, 1I, 1J, 1K are formed in a multi-stage manner in which the diameter of each drill portion gradually increases as it goes to the root.

Further, S ... Represents a tapered surface formed on the step portion of each drill portion 1A to 1K, and in FIG.
A, 2B, 2C, 2D, 2E, 2F, 2G, 2H, 2
I, 2J, and 2K indicate the shapes of the cutting areas cut by the above-described drill portions 1A to 1K,
From the shapes 2A to 2K of these cutting areas, each drill part 1
It can be easily understood that the cutting resistances in A to 1K are substantially the same.

By the way, the diameter φ of each of the drill portions 1A to 1K is 1A = 6 mm, 1B = 8 mm, 1C = 10 m.
m, 1D = 12 mm, 1E = 14 mm, 1F = 16 m
m, 1G = 18 mm, 1H = 20 mm, 1I = 22 m
m, 1J = 24 mm, 1K = 25 mm, and according to the illustrated multi-stage drill 1, it is possible to drill holes up to φ25 mm.
It is needless to say that the number of steps up to 1K and the diameter dimension thereof are merely examples, and the scope of rights of the present invention is not limited to these number of steps and dimension.

FIG. 1 shows a structure of a handy type electric drill using the multi-stage type drill 1 having the above-mentioned structure, and this electric drill generally indicated by reference numeral 3 has a body 3A and a grasping portion. 3T, handle 3E, and operation switch 3S are provided, and when the operation switch 3S is turned on,
The electric motor (not shown) in the body 3A is rotated by the rotary shaft 3B.
Is rotated to rotate the multi-stage drill 1 mounted on the chuck 3C to make a hole SA in a required metal plate ST or the like.

The chuck 3C shown in FIG. 1 is equipped with a multi-stage drill 1 having five stages of drill portions 1A, 1B, 1C, 1D and 1E, but this is an example of implementation. The multi-stage drill 1 of various types including the 11-stage type as shown in FIG. 2 is mounted according to the purpose.

Reference numeral 5 is a stopper with a scale which is slender and adjustable in parallel to the multi-stage drill 1 on a holder 4 provided on the upper surface of the body 3A, and is slidably adjustable in the axial direction. For example, when it is desired to make a hole SA of φ10 mm in the metal plate ST, the stopper 5 with scale is aligned with the scale position of 10 mm and fixed with the tightening screw 4A, and then the multistage drill 1 is rotated. If you drill a hole, the drill section 1C will be the third step with a diameter of 10 mm
Since the tip portion 5A of the stopper 5 hits the metal plate ST to stop the movement of the drill 1 when moving to, it is inevitable to make a hole of φ10 mm.

Since the multistage drill according to the present invention has the structure as described above, each of the drill parts 1A to 1A formed in multistage form.
Because 1K cuts small holes into larger ones,
The cutting resistance in each of the drill portions 1A to 1K can be made almost the same, so that a relatively large hole can be drilled with a small amount of force in a short time in one operation. Since the step portion of each drill portion 1A to 1K is formed on the tapered surface S, the transition to the next step can be smoothly advanced with a small resistance, and in combination with the point of the above cutting resistance, a large hole is formed. However, it can be easily opened with a small motor output, and therefore even an electric drill or a small drilling machine can easily make a large hole of about φ25 mm.

Further, according to the electric drill of the present invention, by slidingly adjusting the stopper 5 with scale,
Since the hole SA having a desired diameter can be accurately drilled by using one multistage drill 1, it is possible to save the trouble of selecting and exchanging the drill each time the diameter of the drilled hole changes.

[0025]

As described above, according to the multi-stage drill according to the present invention, even a relatively large hole can be easily drilled with a small motor output. Therefore, a small drilling machine or an electric drill is used. In addition to the advantage of being able to easily drill a large hole that has not been drilled in the past, in a short time, the electric drill according to the present invention also uses the multi-stage drill described above. Therefore, it is possible to freely drill holes of multiple diameters with one drill,
For example, when it is used when performing drilling work at the site of various constructions, etc., it is possible to greatly streamline the drilling work and save labor.

[Brief description of drawings]

FIG. 1 is a side view illustrating the configuration of an electric drill according to the present invention equipped with a multistage drill.

FIG. 2 is a structural diagram showing the relationship between the multistage drill according to the present invention and the cutting area thereof in contrast.

[Explanation of symbols]

 1 Multi-stage drill 1A-1K Drill part S Tapered surface 3 Electric drill 5 Stopper with scale

Claims (3)

[Claims] 1. A multi-stage drill, characterized in that the diameter of the drill is thinnest at the tip and is gradually increased toward the root end. 2. The multi-stage drill according to claim 1, wherein each step portion of the multi-stage drill is formed in a tapered surface. 3. An electric drill equipped with the multi-stage drill according to claim 1 or 2, wherein a stopper with a scale for determining the diameter of the drill is attached in parallel to the multi-stage drill and slidably adjusted. An electric drill characterized by that.