JPH10329134A - Dust collecting shank for dust collecting type drilling machine and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a dust collecting type drilling machine capable of efficiently sucking chips. SOLUTION: The first dust suction passage 4a communicating with the second dust suction passage 4b has a first end close to the rotary tool 1 such that an end of the first dust suction passage 4a is closer to the core bit 2 than an inner periphery of the second dust suction passage 4b on the rotary tool 1 side.
A dust suction passage 4a and a second dust suction passage 4b are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting shank used in drilling a concrete or the like in a dust collecting type drilling machine and a method of manufacturing the same.

[0002]

2. Description of the Related Art A conventional dust collecting type punch will be described with reference to FIGS. FIG. 8 shows the dust collecting shank adapter 13.
FIG. 9 is a flow diagram showing the flow of air in the dust collecting shank 14.

[0003] A dust collecting shank adapter 13 is provided between the rotary tool 1 and the core bit 2. The dust collecting shank adapter 13 has one end held by a chuck 1a rotated by the rotary tool 1 and the other end provided with a core bit 2.
Dust shank 14 provided with
And a dust collecting shank cover 6 rotatably provided with a plurality of bearings 5 with respect to 4 and having a connection port 6a with a dust collecting hose 7. Inside the dust collecting shank 14, there is provided a dust suction passage through which dust generated during drilling work is sucked by the dust collector 8 via the dust collecting hose 7, and the dust suction passage is formed in the axial direction of the dust collecting shank 14. A first dust suction passage 14a penetrating partway,
A second dust suction passage 14b crossing and communicating with the dust suction passage 14a.

Here, a conventional method for forming the first and second dust suction passages 14a and 14b will be described. First,
A thread groove 14c for screwing with the core bit 2 is formed in the strongly fixed dust collecting shank 14, and then a first dust suction passage 14a is formed by drilling from the same direction to halfway in the axial direction of the dust collecting shank 14. I have. Thereafter, the first dust suction passage 1
The second dust suction passage 14b is formed by drilling from the radial direction of the dust collecting shank 14 so as to cross the second dust suction passage 4a. In the above method, the first
The tip end 14 of the dust suction passage 14a on the side opposite to the core bit 2
d is formed to protrude from the side surface of the second dust suction passage 14b. This is the end 1 of the first dust suction passage 14a.
If the second dust suction passage 14b is formed so as to pass through the 4d, the cutting edge of the drill will have a portion that is cut by the cutting edge and a portion that is not cut when passing through the first dust suction passage. This is to prevent the cutting edge from being damaged early due to the uneven load.

[0005] The rotation preventing member 10 provided on the handle 1 b of the rotary tool 1 is attached to the dust collecting shank cover 6 using the screw 11, thereby preventing the dust collecting shank 14 from rotating with respect to the dust collecting shank 14. I have.

[0006]

In the conventional dust collecting shank, since the first dust suction passage and the second dust suction passage are formed by the above-described method, the tip of the first dust suction passage on the side opposite to the core bit is the second dust suction passage. It protruded from the side surface of the dust suction passage. For this reason, as shown in FIG. 9, when dust is collected by the dust collector, a corner portion that is a connecting portion between the first dust collection passage and the second dust collection passage, or a tip portion formed by the first dust collection passage and the second dust collection passage. When air as indicated by an arrow flows into the dust collecting passage, a turbulent flow is generated in the dust collecting passage, so that there is a problem that windage is lost and the dust collecting efficiency is reduced.

[0007] An object of the present invention is to provide a dust-collecting type punch capable of solving the above-mentioned problems and improving the dust-absorbing efficiency of chips.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method in which an end of a first dust suction passage communicating with a second dust suction passage on the rotary tool side is located closer to the core bit than an inner periphery of the second dust suction passage on the rotary tool side. This is achieved by providing a first dust suction passage and a second dust suction passage.

Further, the present invention is achieved by forming a first dust suction passage and a second dust suction passage by providing a dust collection shank base material made of plastic or aluminum or the like which can be injection-molded in the dust collection shank.

Further, a first step of piercing the second dust suction passage from the radial direction of the dust collecting shank provided on the rotary tool for rotating the core bit, and a step of penetrating the second dust suction passage from the axial direction of the dust collecting shank to the inside. (1) a second step of perforating the dust suction passage.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dry dust collecting type punch according to the present invention will be described with reference to FIGS. 1 is an overall configuration diagram showing an appearance of a dust collecting type punch, FIG. 2 is a partially longitudinal side view showing a state where a dust collecting shank adapter 3 is attached to a rotary tool 1, and FIG.
FIG. 3 is a vertical sectional side view showing the dust collecting shank adapter 3, and FIG.
Is a flow diagram showing the flow of air in the dust collecting shank 4,
FIG. 5 is a vertical sectional side view showing a state in which a second dust suction passage 4b is provided in the radial direction of the dust collecting shank 4, and FIG. 6 is a vertical side view showing a state in which the first dust collecting passage 4a is provided in the axial direction of the dust collecting shank 4. FIG.

A dust collecting shank adapter 3 is provided between the rotary tool 1 and the core bit 2. The dust collecting shank adapter 3 has one end gripped by the chuck 1a of the rotary tool 1 and the other end provided with the core bit 2 and the dust collecting shank 14 through a plurality of bearings 5. A dust collection shank cover 6 rotatably provided and having a connection port 6a for a dust collection hose 7. The dust collecting shank cover 6 is prevented from rotating with respect to the dust collecting shank 4 by attaching the detent member 10 provided on the handle 1b of the rotary tool 1 to the dust collecting shank cover 6 using screws 11. Inside the dust collecting shank 4, there is provided a dust suction passage through which dust generated during drilling work is sucked by a dust collector 8 via a dust collecting hose 7. The first dust suction passage 4a extending in the axial direction of the dust collecting shank 4 as shown in FIGS.
And a second dust suction passage 4b extending in the radial direction of the dust collecting shank 4 so as to communicate with the first dust suction passage 4a.

Here, a method of forming the first dust suction passage 4a and the second dust suction passage 4b will be described with reference to FIGS. First, a screw groove 4c for screwing with the core bit 2 is formed in the dust collection shank 4 which is firmly fixed, and then a second dust suction passage 4b penetrating in the radial direction of the dust collection shank 4 is drilled as a first step. It is formed by processing. Then the second
As a step, the first dust suction passage 4a is formed by drilling from the axial direction of the dust collecting shank 4 so as to communicate with the second dust suction passage 4b. According to the above method, the tip of the first dust suction passage 4a on the side opposite to the core bit 2 does not protrude beyond the inside of the second dust suction passage 4b. By providing the first dust suction passage 4a and the second dust suction passage 4b so as to be located closer to the core bit 2 than the inner periphery of the rotary tool 1 side of the second dust suction passage 4b, the dust collector as shown in FIGS. Since the turbulence does not occur in the dust collecting shank 4 when the dust is absorbed, the dust generated from the concrete 15 or the like as the cutting material can be efficiently absorbed. Further, since the first dust suction passage 4a is formed after the formation of the second dust suction passage 4b, an uneven cutting load is not applied to the cutting edge of the drill 9, so that the life of the drill 9 can be improved.

Further, as shown in FIG. 7, even if the dust collecting shank 14 has the first dust suction passage 14a and the second dust suction passage 14b formed by the method shown in the related art, the protrusion 14d and the first dust suction passage 14a have the same shape. The problem of turbulence can be solved by providing the dust collecting shank base material 12 made of plastic or aluminum or the like that can be injection-molded on the inner periphery. That is, the above problem can be solved with a cheap and simple configuration. Also, a curvature is provided at an end of the dust collecting shank base material 12 provided on the inner periphery of the first dust suction passage 14a, that is, a portion corresponding to a corner formed by intersecting the first dust suction passage 14a and the second dust suction passage 14b. , And the second dust suction passage 14b
By providing the dust collecting shank base material 12 on the inner periphery of the first dust suction passage 14a so as to have substantially the same diameter as the inner diameter of the dust collecting shank base material, generation of turbulence in the dust collecting shank base material can be suppressed, and Can be reduced, so that chips can be efficiently absorbed.

[0015]

According to the present invention, it is possible to provide a dust collecting type drilling machine capable of improving the dust collecting efficiency.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an external appearance of a dust collecting type punch according to the present invention.

FIG. 2 is a partially longitudinal side view showing a state where a dust collecting shank adapter according to the present invention is attached to a rotary tool.

FIG. 3 is a vertical sectional side view showing a dust collecting shank adapter according to the present invention.

FIG. 4 is a flow chart showing the flow of air in the dust collecting shank according to the present invention.

FIG. 5 is a longitudinal sectional side view showing a state in which a second dust suction passage is provided in a radial direction of the dust collecting shank according to the present invention.

FIG. 6 is a longitudinal sectional side view showing a state in which a first dust suction passage is provided in an axial direction of the dust collecting shank according to the present invention.

FIG. 7 is a vertical sectional side view showing a state in which a dust collecting shank base material is provided in the dust collecting shank according to the present invention.

FIG. 8 is a partially longitudinal side view showing a conventional dust collecting shank adapter.

FIG. 9 is a flow chart showing the flow of air in a conventional dust collecting shank.

[Explanation of symbols]

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takayoshi Kuchiki 1060 Takeda, Hitachinaka-shi, Ibaraki Prefecture Within Hitachi Koki Co., Ltd.

Claims (3)

[Claims] 1. A dust collecting shank rotated by the rotating tool, a core bit rotating integrally with the dust collecting shank, and a first dust suction passage provided in an axial direction of the dust collecting shank. A dust collecting drilling machine having a second dust suction passage communicating with the first dust suction passage and provided in a radial direction of the dust collecting shank, wherein the rotation of the first dust suction passage communicating with the second dust suction passage is performed. The dust collecting type punching machine, wherein the first dust suction passage and the second dust suction passage are provided such that a tool side end is located on the core bit side with respect to the inner periphery of the rotary tool side of the second dust suction passage. Dust shank. 2. The first dust collection passage and the second dust collection passage are provided by providing a dust collection shank base material made of plastic or aluminum or the like that can be injection-molded in the dust collection shank. The dust collecting shank of the dust collecting punch according to claim 1. 3. A first step of piercing a second dust suction passage from a radial direction of a dust collecting shank provided on a rotary tool for rotating a core bit, and penetrating into the second dust suction passage from an axial direction of the dust collecting shank. And a second step of perforating the first dust suction passage.