JP2002200580A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power tool improved in the assembling property of a protecting cover for covering a housing and a gear cover and capable of preventing a fall-out of the protecting cover. SOLUTION: The gear cover 7 for housing a speed reduction part is made to abut on a front surface of the housing 4 for housing a motor 3, and fixed. The inner surface of the protecting cover 1 for covering the housing 4 and the gear cover 7 is tightly adhered to the housing 4 and the gear cover 7 having an inclined part 4a, and a side surface of the protecting cover 1 is provided with a V-shape notch 11 directed from an opening end part 12 toward an air window 10 and having a vertex 13 extended to a position ear the air window 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power tool having a protective cover made of an elastic material for covering a gear cover and a housing by fixing a gear cover for accommodating a speed reducer to a front surface of a housing for accommodating a motor. is there.

[0002]

2. Description of the Related Art In the Hitachi Electronics Saver Saw CR12V manufactured and sold by the present applicant, an elastic material such as rubber is used to make it easy to hold a gear cover which is fixed in contact with a front surface of a housing housing a motor and houses a speed reduction portion. The gear cover is covered with a protective cover consisting of The protective cover has almost the same shape as the gear cover, and the rear end is straight.

[0003]

When the protective cover is mounted on the gear cover, the rear end of the protective cover needs to be widened. However, since the rear end is straight, it is difficult to spread and a large force is required to deform the protective cover. However, there is a disadvantage that the assemblability is poor.

[0004] Further, Japanese Patent Application No. 2000
-301411, a protective cover for covering the housing and the gear cover is attached in substantially the same shape as the protective cover of the present invention described later, so that the gear cover is easily gripped and a space for cooling air to pass between the protective cover, the housing and the gear cover is provided. Suggested saver saw. This protective cover is made of a material that is difficult to deform, such as plastic,
It consisted of two members and was fixed with screws. For this reason, a boss for a screw is required, and the boss portion becomes large, and there are many components, resulting in an expensive saver saw.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power tool which eliminates the above-mentioned drawbacks of the prior art, improves the assemblability of the protective cover, and makes it difficult for the protective cover to come off.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide a substantially V-shaped notch extending from the rear end of a protective cover made of an elastic material to the vicinity of a wind window and to the rear of a housing covered by the protective cover. This is achieved by providing an inclined portion having a small diameter.

[0007]

1 and 2 show an embodiment of the present invention in which a power tool is a saver saw.

Reference numeral 1 denotes a protective cover made of an elastic material such as rubber. Reference numeral 2 denotes a speed reduction unit that reduces the output from the motor 3 and converts the rotation into reciprocating motion. Reference numeral 7 denotes a gear cover that houses the reduction unit 2. Reference numeral 4 denotes a housing for housing the motor 3, and a gear cover 7 is fixedly abutted on the front surface. The housing 4 is formed with an inclined portion 4a such that the cross-sectional area of the contact portion 8 with the gear cover 7 is maximized, and the cross-sectional area gradually decreases toward the rear from the contact portion 8, that is, becomes smaller in diameter. Is further provided with a horizontal flat portion 4b. The housing 4 near the contact portion 8 is provided with a cooling window 9 for cooling the motor 3. 5
Is a switch that supplies the electric power of the battery 6 as a power supply to the motor 3. The deceleration unit 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 that detailed description is omitted.

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.
An air window 10 is provided at a position corresponding to the cooling window 9 on both side surfaces 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 apex 13 of the notch 11 extends to the vicinity of the wind window 10. The thin portion 16 is thinner and more easily deformed than the other portions of the protective cover 1.
When 2 is extended in the directions of arrows 14 and 15, the protective cover 1 opens with the vertex 13 as a fulcrum, and expands within the elastic limit, and the opening range of the protective cover 1 becomes larger.

Therefore, if the rear end of the protective cover 1 is widened in the directions of arrows 14 and 15 when the protective cover 1 is assembled, the opening range of the protective cover 1 becomes larger and the gear cover 7 and the housing 4 come into close contact with each other. Since the number of parts is small and friction during assembly can be reduced, the contact portion 8 having the maximum cross-sectional area can be easily passed to the flat portion 4b of the housing 4 and assembly and mounting can be facilitated. That is, the protective cover 1 can be deformed with a small force, so that the assembling is facilitated and the assembling property can be improved. After the assembling 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 while the housing 4 is closed.
The protective cover 1 is hard to be detached.

According to the above embodiment, the protective cover 1
No screws or bosses are required to mount the, and the structure is simplified and the assemblability can be improved. As a result, an inexpensive power tool can be provided.

[0012]

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 assembling property can be improved. After the protective cover is mounted, the protective cover engages with the inclined portion of the housing, so that the housing can be prevented from coming off easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a 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 deceleration 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 part.

Claims (4)

[Claims] 1. A housing housing a motor and having a cooling window in front thereof, a gear cover abutting and fixed to the front surface of the housing, and housing a reduction unit, and moving from the front surface of the gear cover to the rear of the housing by elastic deformation. A power cover comprising a housing, a gear cover, and a protective cover made of an elastic material provided with a wind window at a location corresponding to the cooling window, wherein a vertex extends from the rear end of the protective cover to near the wind window. A power tool comprising: a substantially V-shaped notch; and an inclined portion having a diameter decreasing toward the rear of a housing covered by a protective cover. 2. The housing according to claim 1, wherein a cross-sectional area of the housing is maximized at a contact portion with a gear cover.
The described power tool. 3. The power tool according to claim 1, wherein a horizontal flat portion is provided behind the inclined portion of the housing. 4. The power tool according to claim 1, wherein said elastic material is rubber.