JP3870697B2 - Electric tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric tool including a protective cover made of an elastic material that abuts and fixes a gear cover that houses a speed reduction portion on the front surface of a housing that houses a motor, and covers the gear cover and the housing.
[0002]
[Prior art]
In the Hitachi Electronics Saver CR12V manufactured and sold by the present applicant, a protective cover made of an elastic material such as rubber is used to make it easy to grip the gear cover that is abutted and fixed to the front surface of the housing that houses the motor and that houses the speed reduction part. Covers the gear cover. The protective cover has almost the same shape as the gear cover, and the rear end is straight.
[0003]
[Problems to be solved by the invention]
When attaching the protective cover to the gear cover, it is necessary to widen the rear end of the protective cover, but since the rear end is straight, it is difficult to spread, requiring a large force to deform the protective cover, and the disadvantage of poor assembly there were.
[0004]
In addition, in Japanese Patent Application No. 2000-301411 filed earlier by the present applicant, a protective cover that covers the housing and the gear cover is mounted in substantially the same shape as the protective cover of the present invention, which will be described later. We proposed a saver saw with a space for cooling air to pass between it and the gear cover. This protective cover is made of a material that is not easily deformed, such as plastic, and is composed of two members and fastened with screws. For this reason, a boss for a screw is required, and the boss portion becomes large, and there are a number of components, resulting in an expensive saver saw.
[0005]
An object of the present invention is to provide an electric tool that eliminates the drawbacks of the prior art described above, improves the assembly of the protective cover, and makes it difficult to remove the protective cover.
[0006]
[Means for Solving the Problems]
The object is to provide a substantially V-shaped cutout whose apex extends from the rear end of the protective cover made of an elastic material to the vicinity of the wind window, and by providing an inclined portion having a smaller diameter toward the rear in the housing covered by the protective cover. Achieved.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment in which the power tool of the present invention is a saver saw.
[0008]
Reference numeral 1 denotes a protective cover made of an elastic material such as rubber. Reference numeral 2 denotes a decelerating portion that decelerates the output from the motor 3 and converts the rotation into a reciprocating motion. Reference numeral 7 denotes a gear cover that houses the speed reduction unit 2. Reference numeral 4 denotes a housing for housing the motor 3, and a gear cover 7 is abutted and fixed to the front surface. In the housing 4, the cross-sectional area of the abutting portion 8 with the gear cover 7 is maximized, and the inclined portion 4 a is formed so that the cross-sectional area gradually decreases from the abutting portion 8 toward the rear, that is, has a small diameter. Is further provided with a horizontal flat portion 4b. The housing 4 in the vicinity of the contact portion 8 is provided with a cooling window 9 for cooling the motor 3. Reference numeral 5 denotes a switch that supplies power of the battery 6 as a power source to the motor 3. The speed reducer 2, the motor 3 and the like have a well-known configuration in a saver saw and are not directly related to the present invention, so detailed description will be omitted.
[0009]
The protective cover 1 is formed in such a shape that its inner surface is in close contact with the gear cover 7 and the housing 4. A wind window 10 is provided at a location corresponding to the cooling window 9 on both sides of the protective cover 1, and a V-shaped notch 11 is provided so as to form a thin portion 16 from the opening end 12 side. The vertex 13 of the notch 11 extends to the vicinity of the wind window 10. The thin-walled portion 16 is thinner and easier to deform than the other portions of the protective cover 1, and when the opening end 12 of the protective cover 1 is expanded in the directions of arrows 14 and 15, the protective cover 1 has a vertex 13 as a fulcrum. As a result, the elastic cover is stretched within the elastic limit, and the opening range of the protective cover 1 becomes larger.
[0010]
Therefore, when the protective cover 1 is assembled, if the rear end of the protective cover 1 is widened in the direction of the arrow 14 and the arrow 15, the opening range of the protective cover 1 becomes larger, and the gear cover 7 and the housing 4 have fewer contact portions. Since the friction at the time of assembly can be reduced, the abutting portion 8 having the maximum cross-sectional area can be easily passed to the flat portion 4b of the housing 4 so that the assembly can be easily mounted. That is, the protective cover 1 can be deformed with a small force, and assembling becomes easy and the assembling property can be improved. After the assembly and mounting, the deformation of the protective cover 1 returns and the inner surface of the protective cover 1 comes into close contact with the gear cover 7 and the housing 4 and engages with the inclined portion 4a of the housing 4, so that the protective cover 1 is difficult to come off.
[0011]
According to the above-described embodiment, the mounting of the protective cover 1 eliminates the need for screws and bosses, which simplifies the configuration and improves the assemblability. As a result, an inexpensive electric tool can be provided. Become.
[0012]
【The invention's effect】
According to the present invention, since the protective cover is provided with the V-shaped notch, the protective cover can be deformed with a small force, and the assemblability can be improved. In addition, after the protective cover is attached, the protective cover can be engaged with the inclined portion of the housing, and the effects such as being difficult to be detached from the housing can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of an electric power tool of the present invention.
FIG. 2 is a side view of FIG.
[Explanation of symbols]
1 is a protective cover, 2 is a speed reduction part, 3 is a motor, 4 is a housing, 4a is an inclined part, 4b is a flat part, 5 is a switch, 6 is a battery, 7 is a gear cover, 9 is a cooling window, 10 is a wind window, 11 Is a notch and 16 is a thin portion.

Claims (2)

A housing that houses the motor, a gear cover that is abutted and fixed to the front surface of the housing and that houses the speed reduction unit, a cooling window provided near the abutting and fixing surface of the housing and the gear cover, and moving from the front of the gear cover toward the rear of the housing It is covered with a housing and a gear cover by elastic deformation , has a wind window at a location corresponding to the cooling window, and has a substantially V-shaped notch extending from the rear end to the vicinity of the wind window, and the top of the notch and the wind window electric power tool is characterized in that a protective cover made of rubber elastic material forming the Hosoniku portion between. Claim 1, characterized in that a slope portion of the same shape on the inner surface of the protective cover that covers the inclined portions of Rutotomoni motor housing is provided an inclined portion whose diameter toward the rear in the housing covered by the protective cover The electric tool described .

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