JPS6241571Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended for use in brush devices, especially small motors, in which a terminal part that is integrated with the brush part and has reinforcing ribs is bent outside the motor case, and the bent part is broken. The present invention relates to a brush device in which a cutout hole is provided in advance in the bent portion in order to prevent damage.

As shown in the exploded view of the brush device in FIG. 1, the brush device in a small motor is made of an elastic flat conductive material such as a copper-beryllium alloy, and is formed into the shape shown in FIG. 1 by punching. It is then bent at the dashed line in the figure to form the desired shape. The brush device has a brush portion formed by a brush 2 and a brush arm 3, and a terminal portion 1 shown in the figure, which are integrated into one body, and are attached to a motor case having a support portion. It should be noted that the brush device described above is relatively thin, with a plate thickness of about 0.08 mm, in order to maintain good contact between the brush 2 and the commutator of the motor, so it is necessary to increase the mechanical strength. As described with reference to FIG. 1, the reinforcing ribs 4 were formed by bending both sides of the terminal portion 1 along the chain lines shown in FIG.

As shown in FIG. 2, such a terminal part 1 is made to protrude from a terminal outlet 6 of a motor case 5 and is connected to a lead wire, but due to problems in connection direction and space, the terminal part 1 is It is often better to use the connector 1 by bending it from the chain line shown in FIG. 2 to a right angle position at the terminal outlet 6 as shown by the solid line in FIG.

When the terminal portion 1 is bent in this way, the reinforcing rib 4 becomes ruptured as shown in FIG. The action is concentrated on the bent portion 7 of the terminal portion 1, so that the bent portion 7 of the terminal portion 1 is bent linearly as shown in FIG. For this reason, bending stress is concentrated here, causing undesired cracks, increasing electrical resistance undesirably, and possibly causing breakage at the bent portion 7.

Although the rupture of only the reinforcing rib 4 does not particularly affect the function of the terminal section, cracks and cracks in the bent portion 7 of the terminal section 1 undesirably increase the electrical resistance and may cause the reinforcing rib 4 to rupture. A disconnection accident will occur. Furthermore, when the terminal portion 1 is bent, the reinforcing rib 4 is bent from the ruptured location (position), so another problem arises in that the terminal portion 1 cannot be bent correctly from the desired position.

The present invention aims to eliminate the above-mentioned drawbacks, and includes forming reinforcing ribs on both side edges or one side edge of the terminal portion, and providing cut holes in advance at desired positions of the reinforcing ribs. The aim is to solve the above problems. The present invention will be explained below with reference to the drawings.

FIG. 4 is a developed view of the first embodiment of the present invention, FIG. 5 is a perspective view of the same, and FIG. 6 is a perspective view of the folded portion.
FIG. 7 shows a partially exploded view of the terminal section in the second embodiment of the present invention, and FIG. 8 shows a partially developed view of the terminal section in the third embodiment of the present invention.

In FIGS. 4 to 8, the same reference numerals as in FIGS. 1 to 3 correspond to the same parts, 8 represents the cutout hole, and 9 represents the folded portion of the present invention. Fourth
As shown in Figures to Figures 6, in the present invention,
For example, a flat plate of copper-beryllium alloy with a thickness of 0.08 mm is punched into a substantially L shape, and the brush part consisting of the brush 2 and brush arm 3 and the terminal part 1 are integrally formed, and the chain line shown in FIG. The reinforcing ribs 4 are formed by bending from the point , and the brush device is formed into a desired shape as shown in FIG. These matters are basically the same as in the conventional case explained with reference to FIG. However, in the case of the present invention, as shown in FIGS. 4 and 5, cutout holes 8, 8 are provided in advance at the positions of the reinforcing ribs 4.

This brush device is connected to a motor as shown in Figure 2.
It is installed inside the motor case 5, and the terminal part 1 is projected out of the motor case 5 from the terminal projection opening 6. Needless to say, when the terminal section 1 is used with the terminal section 1 straight (indicated by the chain line), the lead wire is attached to the terminal section 1 as is. If it is desired to use the terminal part 1 by bending it as shown by the solid line in the figure, the terminal part 1 is bent as shown by the arrow in FIG. 5 at the position where the notch hole 8 is present. At this time, the reinforcing rib 4 is ruptured as shown in FIG. 6, but since the cutout hole 8 is present, the reinforcing rib 4 becomes more easily bent at that part, as shown in FIG. 6, compared to the case shown in FIG. 3. A bent portion 9 having a predetermined radius of curvature is formed.

Therefore, the folded portion 7 of the conventional brush device
As shown in FIG. 3, the bending stress is not concentrated linearly but is dispersed. That is, the terminal portion 1 will not be undesirably cracked or cut. Of course, in this case as well, the reinforcing rib 4 ruptures as in the conventional case, but this does not pose any particular problem in terms of its function as a terminal. In addition, in the case of the device of the present invention, the shape is curved with a relatively large radius of curvature, as shown in the folded portion 9 shown in FIG. If the terminal part is returned to its original state, it will almost return to its flat shape.

In the case of the first embodiment shown in FIG. 4, the cutout hole 8 is provided astride the main body of the terminal part 1 and the reinforcing rib 4, but as in the second embodiment shown in FIG. The notch hole 8 may be provided only on the main body side of the terminal portion 1, or may be provided only on the reinforcing rib 4 side as in the third embodiment shown in FIG.
In this case, that is, in the case of FIGS. 7 and 8, it goes without saying that the notch hole 8 is formed so as to contact or straddle the bent portion of the reinforcing rib 4.

It goes without saying that the shape of the notch hole 8 is not limited to a rectangular shape, and that its size and shape can be determined in various ways without impairing its function as a terminal.

As described in detail above, according to the present invention, the brush part and the terminal part are integrally formed and have a reinforcing rib structure, and a notch hole is preliminarily formed at a desired position in the terminal part. Since the terminal portion is bent at the notch hole, it is possible to prevent undesired cracks or cuts from occurring at the bent portion. Moreover, even if it is repeatedly bent, it can be essentially restored to its original state.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of a conventional brush device, Fig. 2 is a partial perspective view of the brush device attached to a small motor, Fig. 3 is a perspective view showing the folded portion of the conventional brush device, and Fig. 4 The figure is a developed view of the first embodiment of the present invention, Figure 5 is a perspective view of the brush device of the present invention, Figure 6 is a perspective view showing the folded portion of the brush device of the present invention, and Figure 7 8 shows a partially exploded view of the terminal portion in the second embodiment of the present invention, and FIG. 8 shows a partially developed view of the terminal portion in the third embodiment of the present invention. 1 is a terminal portion, 2 is a brush, 3 is a brush arm, 4 is a reinforcing rib, 8 is a cutout hole, and 9 is a bent portion in the brush device of the present invention.

Claims (1)

[Scope of utility model registration request] A brush portion and a terminal portion are integrally connected, and the brush portion is located inside the motor and the terminal portion is configured to protrude from a terminal outlet of a motor case,
In a brush device in which reinforcing ribs are provided by folding both end sides or one side end in a direction perpendicular to the longitudinal direction of the terminal part, the reinforcing ribs are provided in accordance with the position where the terminal part is bent. A brush device characterized in that a notch hole having a longitudinal direction in a direction along the longitudinal direction is formed in advance so as to be in contact with a bent portion of a rib or to straddle the bent portion.