JP2000117661A - Hammer clutch structure of motor-driven impact tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change the performance as an impact tool, particularly the power by making the parts of a divided type hammer clutch mounted on an impact part, out of various materials of different specific gravities, and changing the combination of these parts. SOLUTION: A hammer clutch 1 is formed by a first member 2 and a second member 3 screwed on an outer peripheral surface side of the first member 2. The first member 2 is formed in such manner that it strikes an anvil by its hammering part 21 mounted on its side part, so that a material having the strength to some extent, for example, iron or the like is used for the same. On the other hand, the second member 3 is screwed on an outer peripheral surface of the first member 2 in a fitting state, so that the second member made of lead and copper heavier than the first member 2, and that made of aluminum, titanium or the like lighter than the first member 2 are respectively prepared to be used corresponding to the use. Whereby the motor-driven impact tool of different performance can be provided while using the common main body part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric impact tool for driving an impact portion by a motor and rotatingly driving a driver bit or a socket connected to the impact portion, and more particularly to a hammer clutch structure of the electric impact tool. It is.

[0002]

2. Description of the Related Art An electric impact tool is provided with an impact mechanism 100 as shown in FIG.
The impact mechanism 100 includes a hammer clutch 1
01 is attached.

[0003]

In this electric impact tool, the rotational speed of the motor, the mass of the hammer clutch (force is proportional to the mass by Newton's law), the spring force of the clutch spring, etc. It is the main factor that determines the magnitude of force). However, the rotation speed of the motor is constant depending on the applied voltage, and the clutch spring cannot be easily replaced. Also, as shown in FIG. 4, the hammer clutch 101 is usually formed integrally using one type of material, and it is difficult to change the mass.

[0004] Under such circumstances, the maximum impact force obtained by each electric impact tool is fixed at a constant value. By changing the material of the hammer clutch and increasing its mass, it is conceivable that a higher impact force can be obtained.However, for example, when lead having a high specific gravity is used, there is a problem in that the contact portion with the anvil has a strong strength. It is not realistic, such as the occurrence of.

Accordingly, the present invention has been made in view of the above circumstances, and has as its object to provide an electric impact tool in which the performance as an impact tool, in particular, the power (impact force) can be easily changed at low cost. It is the purpose.

[0006]

According to a first aspect of the present invention, there is provided an electric impact tool in which an impact portion is operated by a motor and a driver bit or a socket connected to the impact portion is rotationally driven. The hammer clutch attached to the part is formed so that it can be divided, and each part of the divided hammer clutch is made of various materials having different specific gravities, and the mass of the hammer clutch is changed by changing the combination of these parts. It is configured as follows.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an electric impact tool according to the present invention. The electric impact tool includes an impact unit 100 (see FIG. 3).
Is formed so that the hammer clutch 1 to be attached to the vehicle can be divided.

The hammer clutch 1 includes a first member 2 and a second member 3 screwed to the outer peripheral surface of the first member 2. Further, the first member 2 includes a hitting portion 2 provided on a side portion.
In FIG. 1, an anvil (not shown) is struck. For this purpose, a material having a certain strength, for example, iron is used. On the other hand, the second member 3 is screwed in a state of being fitted to the outer peripheral surface of the first member 2. In this embodiment, the second member 3 is formed of, for example, lead or copper which is heavier than the first member 2 (weight member). In addition, a member (lightweight member) formed of aluminum, titanium, plastic, or the like, which is lighter than the first member 2, may be prepared, and may be replaced according to the application.

Therefore, according to this embodiment, the second member 3 made of a plurality of materials having various specific gravities prepared in advance is selected according to the application of the tool, and is used, for example, as an electric impact tool having a large power (impact force). In this case, a member made of a material having a high specific gravity may be selected and fixed to the outer peripheral surface of the first member 2 by a screwing means 5 such as a bolt or a screw.

When used as an electric impact tool having a relatively small power (impact force), the second member 3
What is necessary is just to select what was formed with the material of low specific gravity, and to fix to the outer peripheral surface of the 1st member 2.

[0011] This makes it possible to form electric impact tools having different performances by using the same main body portion, which is much more economical than preparing various types of tools separately.

Further, in addition to that of this embodiment, as shown in FIG. 2, for example, another member (third member 4) is screwed and mounted on the second member 3 to improve the performance (impact). Since the range of force can be further expanded, it is possible to meet more detailed needs at low cost. In particular, it is effective because a large power (impact force) can be formed even with a small size.

[0013]

As described above, according to the present invention, in an electric impact tool in which an impact portion is operated by a motor and a driver bit or a socket connected to the impact portion is rotated, a hammer clutch attached to the impact portion is provided. Is formed so that it can be divided, each part of the divided hammer clutch is formed of various materials having different specific gravities, and the configuration is such that the mass of the hammer clutch is changed by changing the combination of parts.
Impact force (power) that affects the performance of electric impact tools
Can be adjusted by changing the mass, so that it is easy to change and adjust the power at low cost simply by replacing the parts with different masses that make up the hammer clutch. Can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a hammer clutch according to the present invention.

FIG. 2 is a sectional view showing a modified example of the hammer clutch according to the present invention.

FIG. 3 is a sectional view showing a conventional electric impact tool.

FIG. 4 is a sectional view showing a conventional hammer clutch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hammer clutch 2 1st member (parts) 3 2nd member (parts) 4 3rd member (parts)

Claims (1)

[Claims] An impact unit is operated by a motor,
In an electric impact tool for rotating a driver bit or a socket connected to the impact portion, a hammer clutch attached to the impact portion is formed so as to be dividable, and each part of the divided hammer clutch is made of various materials having different specific gravities. A hammer clutch structure for an electric impact tool, wherein the mass of the hammer clutch is changed by changing the combination of these parts.