JP2586550Y2 - Anti-vibration structure of hammer drill - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration structure for a cordless hammer drill having a speed change switch in which an element is connected to the outside of a switch body.

[0002]

2. Description of the Related Art FIGS.
This will be described with reference to FIG. The element 2 connected to the switch body (not shown) is fixed to the heat radiator 3 with screws. Further, a part of the heat radiator 3 is fixed to the heat radiator 3 with the terminal 2a of the element sandwiched by bending a holding plate 3a. Therefore, a gap always occurs between the terminals 2a of the element. The terminal 2a of the element is always bent by pressing the terminal 2a of the element from above.

[0003]

Conventionally, since the terminals of the element are fixed by a plate-shaped metal, a gap always occurs between the terminals of the element. Further, since the terminal of the element is fixed by bending a part of the heat radiator, the terminal of the element cannot be fixed properly due to a variation due to work. Further, since the terminals of the element are pressed from above with a plate-like metal, stress is always applied to the terminals. Therefore, when vibration is applied to the cordless hammer drill, there occurs a problem that the switch body and the element cause relative movement, stress is applied to the terminals of the element, and the element may be damaged. An object of the present invention is to solve the above problems and to extend the life of the device.

[0004]

In order to achieve the above object, in the present invention, the terminals of the element are fixed to the radiator with an elastic material so as to fill the gaps between the terminals of the element and between the terminals of the element. Is achieved by

[0005]

[Function] When a cordless hammer drill is operated, vibration is applied. The vibration causes the switch body and the element to move relative to each other, so that stress is applied to the terminals of the element, but the switch operates to be absorbed by the elastic material around the terminals.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a longitudinal sectional side view showing an embodiment of a cordless rotary hammer drill according to the present invention, and FIG. 2 is a cross-sectional side view of a terminal portion of the present invention.

The element 2 connected to the switch body 1 by the lead wire 5 is fixed to the radiator 3 by screws 6. Elastic material 4
Is initially fluid or semi-fluid, so that the heat radiator 3 is provided with a concave portion so as not to flow out from the heat radiator 3, and fills the gap between the terminals 2a of the element and then cures. The terminal 2a of the element is fixed to the heat radiator 3 by using a rubber-based or silicon-based elastic material 4.

[0008]

According to the present invention, the terminal of the element is fixed to the heat radiator while the gap around the element is filled with the elastic material, so that the stress applied to the terminal of the element is absorbed and the terminal of the element is prevented from being damaged. You can do it. Further, when the terminal of the element is pressed, since the terminal is not bent, it is possible to prevent stress from being applied to the terminal of the element from the beginning. Therefore, the life of the elements connected to the switch body can be extended.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of a power tool according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional side view showing an example around a device according to the related art.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

2 is an element, 2a is a terminal of the element, 3 is a radiator, and 4 is an elastic material.

Claims (2)

(57) [Scope of request for utility model registration] 1. A speed change switch of a hammer drill comprising a switch body, an element connected to the switch body, and a radiator to which the element is fixed, wherein the terminal of the element is formed of an elastic material by an elastic material. An anti-vibration structure for hammer drills, characterized by being fixed so as to fill gaps between terminals. 2. The heat dissipating body according to claim 2, wherein the elastic material has fluidity or semi-fluidity at first, has a property of hardening thereafter, and has a concave portion provided on the heat dissipating member so as not to flow out from the heat dissipating member. The vibration damping structure for a hammer drill according to claim 1.