JPH074773B2 - Cordless power tools - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an arrangement of a handle portion for operating a cordless power tool body and a drive battery power source portion.

[Background of the Invention]

When drilling and tightening screws, it is necessary to work straight on the work material. Therefore, in the case of electric tools, the handle part is arranged in the rear of the main body in a direction substantially perpendicular to the shaft, and the handle part is formed in a substantially D-shape, in order to extend the axis of the holder that grasps the tip tool such as a drill or a driver bit. (Hereinafter D
Shaped handle), which has a structure that can push the tip tool vertically against the work material without shifting the core.

The D-handle type cordless power tool of the present invention is
Compared to the D-type handle type power tool with a cord, the power source is added, so the weight of the main body is heavy and the main body is large, and there is a power supply in the handle grip during sideways and upward work. Since the moment of the weight of the part is further applied, it becomes difficult for the operator to operate.

[Object of the Invention]

An object of the present invention is to solve the drawbacks of the D-type handle type cordless power tool and improve the operability in accordance with the above object.

[Outline of Invention]

The present invention focuses on the fact that the moment applied to the operator's hand can be reduced by disposing the power supply unit substantially immediately below the handle grip for operating the main body and at a position close to the grip,
The relationship between the power supply and the handle grip is devised.

Example of Invention

An embodiment according to the present invention is shown in FIGS. In the figure, 1 is a motor unit of a drive source, and rotation of the motor unit 1 is decelerated by a gear unit 2. It is transmitted to a holder that holds a tip tool such as a drill or a driver bit. The handle 5 is disposed on the axis (Y-Y) of the holder, behind the motor section, in a direction perpendicular to the axis, and is formed into a substantially D-shape at the outer frame portion that is supported above and below the motor section 1. Is forming. The power supply unit 4 for accommodating and fixing the battery for supplying electric power to the motor unit 1 is arranged such that the battery is arranged so that a thin portion can be accommodated in the grip portion of the handle 5 and a thick portion under the handle 5, and Part 4
Is arranged so that the position of its center of gravity is almost directly below the handle grip portion.

The features of the cordless D-type handle type power tool according to the present invention having the above structure will be described. Cordless D according to the present invention
The type handle type power tool has drawbacks that the weight of the main body is increased and the size of the main body is increased as compared with the conventional D-type handle type power tool with a cord because the power source unit 4 is added. However, the present invention is characterized by improving the operability by devising the relationship between the position of the power supply unit 4 and the battery arrangement in the power supply unit in order to solve the above-mentioned drawbacks. That is, when the main body is used horizontally for lateral work, the weight of the main body and the moment from the center of gravity are applied to the hand of the operator who holds the handle 5. This moment is
Center of gravity position A of the body of the main body composed of the motor unit 1, the gear unit 2 and the holder 3, the weight WA to the handle 5 The distance lA of the gripping center D, the power source unit 4 center of gravity position B, and the weight WB to the handle 5
It is the sum of the grip center D and the distance 1B. In other words, the moment M ₁ = WAlA + WBlB, but 1B = 0, so M = MAlA and the moment applied to the grip portion of the power source unit 4 is zero. In other words, the distance from the center of gravity C weight WC of the entire main body to the center D of the grip 5 of the handle 5 is shortened by lC, so that the moment applied to the grip of the handle is reduced.

Also, when the main body is used for improvement work, moments from the center of gravity of the body of the main body and the center of gravity of the power source unit 4 are applied to the handle 5 grip portion. Since the part is thin and the lower part of the handle is thick, the distance l between the center of gravity B of the power source unit 4 and the weight WA from the handle grip center D is shortened, so the moment M ₂ = WBl applied to the handle grip is reduced. .

〔The invention's effect〕

According to the present invention, the moment applied to the handle grip portion is reduced by placing the power supply unit directly under the grip portion during lateral work. Further, during the upward work, it can be reduced by devising the battery arrangement of the power supply unit, and accordingly, the operability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a cordless power tool according to the present invention, and FIG. 2 is a side view of FIG. 1 viewed from P. 1 is a motor part, 2 is a gear part, 3 is a holder, 4 is a power supply part, and 5 is a handle part.

Claims (1)

[Claims] 1. A main body portion including a motor portion of a drive source, a gear portion for reducing the rotation of the motor, a holder for grasping a drill, a driver bit, etc., and an axial extension of the holder behind the main body portion. A cross-sectional area that can be housed in the grip portion of the handle in an electric tool having a handle portion arranged in a direction substantially perpendicular to the shaft and connecting the handle portion and the main body portion in a substantially D shape. The power source unit arranged in a stepped shape having a small exposed portion and a large exposed cross-sectional area other than the handle is housed under the handle, and the center of gravity of the power source unit is operated to open and close the power source. A cordless power tool that is installed almost directly under the handle grip.