JP2002254356A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool capable of absorbing vibrations and ensuring sealing performance, by an elastic element such as a rubber member molded on a surface of a housing in two-layers. SOLUTION: In a two-divided housing of an impact electric tool actuated by a storage battery, elastic rubber is two-layer molded on a surface 15 abutting on the two-divided housing, and the elastic rubber is provided on a part of a motor 6, a speed-reducing mechanism portion 7, and a striking mechanism portion 8 abutting on the housing.

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 power tool.

[0002]

2. Description of the Related Art FIG.
This will be described with reference to FIG. 7 is a side view showing a split housing of the conventional power tool, and FIG. 8 is a front view showing one of the split housings shown in FIG. FIG.
In FIG. 8, abutments 21, 22, and 23 made of a soft material are provided on the surface of the split housing.
The abutment serves to prevent the operator from gripping the power tool reliably, or to improve the grip and improve the operability and workability. It also prevents the power tool from being damaged by absorbing the impact when dropped on the ground, and prevents the power tool from sliding down along the slope when the power tool is placed on an inclined surface. is there. Therefore, the contact portion is provided mainly on the handle grip portion 21 of the split housing, the rear surface 22 of the body portion, and the periphery 23 of the storage battery accommodating portion.

[0003]

The soft material is provided for the purpose of operability of the electric tool and protection of the tool grounding surface. However, the soft material is not provided in consideration of the vibration proof or sealing property of the electric tool. Did not. Therefore, it is necessary to separately provide components such as a damper and a packing in order to secure the vibration proof and the sealing property, and there has been a problem that the cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric power tool which solves the above-mentioned problems and which can absorb vibrations and secure sealing performance by an elastic body such as a rubber member formed on a surface of a housing by two-layer molding. It is.

[0005]

The object of the present invention is to provide a storage battery,
A motor rotatably driven by the storage battery, a reduction mechanism for transmitting the rotation power of the motor, a percussion mechanism for converting the rotation power of the reduction mechanism into a percussion force, a hammer case for accommodating the percussion mechanism, and a hammer case. In a power tool having an adjacent two-piece housing for housing a motor and an elastic rubber formed by two-layer molding on the surface of the two-piece housing, an elastic rubber is provided at a portion abutting on the two-piece housing. This is achieved by:

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power tool according to the present embodiment will be described below with reference to FIGS. FIG. 1 is a sectional view showing a battery-powered rotary impact tool according to the present embodiment. The battery-powered rotary impact tool includes a housing 1 serving as an outer frame, a hammer case 2, a rechargeable battery 3 serving as a power supply, and a switch for driving a main body. 4. A switch terminal unit 5 serving as a contact point with the rechargeable battery 3, a motor unit 6 serving as a driving source, a reduction mechanism 7 for reducing the rotation output from the motor unit 6, and a rotation output from the reduction mechanism 7 is converted into a rotary impact. It has a rotary impact mechanism 8.

FIG. 2 is a front view of FIG. 1 showing a housing 1 which has been subjected to a two-layer molding process using an elastic body (elastic rubber) such as a rubber member, and FIG. 3 is a side view of FIG. Note that the hatched portions in the drawing indicate portions subjected to a two-layer molding process using an elastic body such as a rubber member. 2 and 3, a contact surface 11 between the housing 1 and the hammer case 2 has been subjected to a two-layer forming process, and the elastic member has been used to apply an axial force generated when the rotary impact mechanism 7 is hit. Vibration can be reduced. Further, by ensuring the airtightness between the housing 1 and the hammer case 2, it is possible to prevent the lubricant such as grease filled in the speed reduction mechanism 6 and the rotary impact mechanism 7 from leaking out of the housing 1. Can be.

A battery insertion portion 12, a switch holding portion 13, a fitting portion 14 for the speed reduction mechanism 6, and a fitting portion 15 for joining the housing 1 to the other half of the housing 1.
Is subjected to a two-layer forming process, thereby causing abrasion between the housing 1 and the rechargeable battery 3 due to vibration generated at the time of impact, and vibration between the switch terminal 5 and the terminal of the rechargeable battery 3. This can prevent conduction failure due to generation of oxide due to chattering, and can improve the life of the housing 1 and the rechargeable battery 3.

Further, as shown in FIGS. 4 and 5, the two-layer forming process for the fitting portion 14 with the speed reduction mechanism 7 in the housing 1 is performed by pushing the inner cover peripheral stopper 16 and the housing 1 in the speed reduction mechanism 7 together. The contact portion 17 and the side surface portion 18 are provided. Thus, a vibration damping effect can be obtained with respect to vibration in both the axial direction and the radial direction generated at the time of impact by the rotary impact mechanism 7.

The switch holding portion 13 of the housing 1
The two-layer forming process prevents the conduction failure caused by the displacement of the contact portion of the switch 4 due to the wear due to the vibration generated at the time of hitting by the rotary hitting mechanism 7, thereby improving the life of the switch. I can do it.

FIG. 6 is a side view of the mating portion of the housing 1.
An elastic body such as a rubber member having been subjected to a two-layer molding process in the mating portion has a convex flange 19 on one side and a concave groove 20 for engaging with the convex flange on the other, thereby providing contact. By increasing the area, it is possible to reduce vibration and prevent grease leakage at the joining portion.

[0012]

According to the present invention, when a two-layer molding process is performed on a housing of a power tool with an elastic body such as a rubber member, a contact surface between a housing and a component such as a hammer case and a rechargeable battery to be joined to the housing is formed. By performing the two-layer molding process, a damper and a sealing property can be added without using a new part, and the life and operability of the product body can be improved.

Further, by performing a two-layer molding process on the concave groove which is fitted with the convex flange provided in the housing mating portion, further damper and sealing properties are caused due to an increase in the contact area between the two. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a battery-powered rotary impact tool according to the present invention.

FIG. 2 is a front view showing a split housing of the battery-powered rotary impact tool shown in FIG.

FIG. 3 is a side view of the split housing shown in FIG. 2;

FIG. 4 is a longitudinal sectional side view showing a mating surface of a speed reduction mechanism and a split housing according to the present invention.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is an enlarged view of a main part showing a mating surface of a split housing according to the present invention.

FIG. 7 is a side view showing a split housing of a conventional battery-powered rotary impact tool.

FIG. 8 is a front view of the split housing shown in FIG. 7;

[Explanation of symbols]

1 is a housing, 2 is a hammer case, 3 is a rechargeable battery, 4
Is a switch, 5 is a switch terminal, 6 is a motor, 7
Is a speed reducing mechanism portion, 8 is a rotation hitting portion, 11 is a joint portion between the housing and the hammer case, 12 is a rechargeable battery insertion portion of the housing, 13 is a joint portion between the housing and a switch, 14 is a fitting portion between the housing and the speed reducing mechanism, 15 is a mating portion of the split housing, 16 is a deceleration mechanism detent portion, 17 is a deceleration mechanism abutting portion, 18 is a side portion of the deceleration mechanism, 19 is a convex flange, 20 is a concave groove, and 21 is a handle grip. Reference numeral 22 denotes a rear surface of the body, and 23 denotes a side contact surface.

Claims (6)

[Claims] 1. A storage battery, a motor rotationally driven by the storage battery, a speed reduction mechanism for transmitting the rotation power of the motor, a striking mechanism for converting the rotation power of the speed reduction mechanism into a striking force, A power tool including a hammer case for housing a mechanism, a split housing adjacent to the hammer case and housing the motor, and an elastic rubber formed on a surface of the split housing by two-layer molding. The power tool according to claim 1, wherein the elastic rubber is provided in a portion abutting on the split housing. 2. The power tool according to claim 1, wherein the elastic rubber is provided at a contact portion between the split housings. 3. The power tool according to claim 1, wherein the contact portion has an uneven shape. 4. The power tool according to claim 1, wherein the elastic rubber is provided at a contact portion between the split housing and the hammer case. 5. The power tool according to claim 1, wherein the elastic rubber is provided at a contact portion between the split housing and the storage battery. 6. The power tool according to claim 1, wherein the elastic rubber is provided at a contact portion between the split housing and the speed reduction mechanism.