JPS5924472Y2 - End cover for power tools such as electric hammers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an end cover for a power tool such as an electric hammer.

Generally, in a power tool, a cooling air intake hole for the motor and a bearing hole for the motor shaft are provided on the rear wall of the motor case, and a brush holder is interposed in a mounting hole formed on the rear side of the peripheral wall. This product is equipped with a carbon brush, but if the brush cap of the brush holder is exposed, it may break due to collision with other objects, or may become loose or come off due to vibration of the tool, so conventionally It is common to attach a protection plate to the brush cap.

In addition, power tools such as electric hammers that are often used to crush and process concrete are used in dusty environments, so the dust may be sucked in with the air from the cooling air intake holes, causing damage to commutators and amateurs. It hits and adheres to the windings, etc., and this causes damage to the armature.

Therefore, as a result of studies in view of the above-mentioned conventional circumstances, the present invention has resulted in an end cover that is suitable for also serving as a protection plate for the brush portion and holding a dust-proof porous member on the rear surface of the motor case. .

The following is a detailed description of the drawings showing the embodiments of the present invention. In FIG. 1, there is a rear wall 2 at the center of the motor case 1.
A motor shaft 8 equipped with an armature 5, an armature winding section 6, and a commutator 7 is supported by a ball bearing 4 interposed in a bearing hole 3 provided in a front wall (not shown), and is externally mounted on the armature 5. The carbon brush 10 is placed in contact with the field 9 and the commichitaf.
are arranged respectively.

The carbon brush 10 is attached to the peripheral wall 1 of the motor case 1.
Insert a set screw 13 into a mounting hole 12 formed through the rear side of 1.
The brush cap 1 is inserted into the brush holder 14 and is screwed onto the brush holder 14.
Supported by 5.

Further, the rear wall 2 of the motor case 1 is provided with a plurality of cooling air intake holes 16 for cooling the motor.

Thus, the end cover 17 has a disk portion that is wide enough to cover the rear wall 2 and the opening of the mounting hole 12, and covers the rear wall 2, as shown in FIGS. 2 and 3. 17 a and
It is integrally formed with a tongue-shaped plate part 17b curved on one side of a disc part 17a so as to cover the mounting hole 12,
A plurality of air holes 18... are formed in the disk portion 17a.

The end cover 17 covers the rear wall 2 of the motor case 1 and the opening of the carbon brush mounting hole 12, and is fixed to the motor case 1 with setscrews 19, as shown in FIG. A dustproof porous member 20 made of sponge rubber or the like is interposed and held between the motor case 1 and the rear wall 2.

As explained above, the end cover according to the present invention can protect the brush holder and the brush cap 15 and the dustproof porous member 2 in a power tool such as an electric hammer.
0 can be maintained with a single part, which is excellent in economy and installation workability.In addition, the cooling air intake holes 16 on the rear wall 2 of the motor case and the bearing holes 3 are made of porous material for dustproofing. Since it can be covered with the member 20, the dustproof porous member 20 can prevent dust and the like from being sucked into the motor case 1 along with air, and the effect of protecting the motor from dust is enormous.

In addition, the end cover 17 can be manufactured simply and easily by integrally molding a synthetic resin material or by pressing a metal plate, so it can not only be provided at a low cost, but also by simply providing a tapped hole at an appropriate location on the motor case 1. Since it can be attached using the setscrews 19..., it is extremely easy to attach and detach, and the dust-proof porous member 20 has excellent replaceability, and it also has the advantage of being able to be attached to a conventional motor case without any particular modification. .

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal cross-sectional view of a power tool with an end cover according to the present invention attached, FIG. 2 is a rear view of the power tool, and FIG. 3 is a side view of the power tool. 1... Motor case, 2... Motor case rear wall, 3... Bearing hole, 10... Carbon brush, 11... Motor peripheral wall of the case,
12...Mounting hole, 17...End cover, 18...Air hole, 20...Porous member for dustproofing.

Claims (1)

[Scope of utility model registration request] In power tools such as electric hammers, a disc part with an air hole and a tongue-shaped part are used to cover the rear wall of the motor case, which has a cooling air intake hole and a bearing hole, and a part of the peripheral wall where a carbon brush is attached. An end cover is formed from the plate,
A power tool such as an electric hammer, characterized in that the end cover covers a carbon brush attachment hole from the rear wall of the motor case, and a dustproof porous member is interposed and held at least between the end cover and the rear wall. end cover.