JPS6227019Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved automatic stop brush with a current cutoff mechanism.

As shown in Fig. 1, the conventional automatic stop brush has a structure in which a three-stage counterbore hole is formed in the head of the brush body 1, and a cutoff piece 6 of a current cutoff mechanism is inserted into the counterbore hole.
Then, the spring 5 was inserted, and with the spring 5 compressed, the receiver 4 was adhered to the brush main body 1 with a silver adhesive, and the lead wire 2 was fixed to the upper part thereof by the copper powder method. In addition, in FIG. 1, 3 is copper powder. However, in the conventional processing method, the receiver 4 must be glued inside the brush while the spring 5 is compressed, so it takes time to apply the adhesive and dry the receiver 4, and a silver-based adhesive is used. Therefore, the cost was high. Further, during assembly, there was a risk that the receiver 4 would peel off due to the repulsive force of the spring 5 and the lead wire 2 would fly out.

The object of the present invention is to provide a self-stopping brush that does not have the above-mentioned drawbacks.

In this invention, a receiver is arranged at the bottom of the first counterbore hole from the top of the three counterbore holes formed in the head of the brush body, the lead wire is fixed to the top of the receiver, and the second counterbore hole from the top is fixed to the top of the receiver. In an automatic stop brush in which a spring is inserted into the counterbore hole of , and shutoff pieces are inserted into the second and third counterbore holes from the top, immediately below the receiver and at the top of the second counterbore hole from the top. A through hole is formed in the thickness direction or width direction, a pin is inserted through the through hole, and the end of the pin is fixed in the through hole, and a spring of the current interrupting mechanism is installed in the counterbore hole at the bottom of the pin. The present invention relates to an automatic stop brush which is inserted in a compressed state and further inserted with a blocking piece pressed downward by a spring.

In the present invention, there are no particular restrictions on the shape and fixing method of the pin, but it is preferable that the pin be tapered so that it does not easily come out of the brush body, and that the end of the pin be fixed with an adhesive.

Further, the interrupting piece may be made of a material having high strength and high insulation properties without any particular limitation, but it is preferable to use, for example, polypropylene resin, polyacetal resin, polyethylene resin, or the like.

The present invention will be explained below with reference to the drawings.

FIG. 2 is a partially sectional front view of an automatic stop brush according to an embodiment of the present invention, FIG. 3 is a side view thereof, and FIG. 4 is a sectional front view showing a state in which the current interrupting mechanism is activated.

Three stages of counterbore holes are formed in the head of the brush body 1, and a through hole is formed in the thickness direction or width direction above the second counterbore hole from the top. Next, insert the interrupting piece 6 of the current interrupting mechanism into the second and third counterbore holes from the top, and then insert the spring 5, and then compress the spring 5.
The taper pin 7 is passed through the through hole while sliding a part of the upper surface and the upper surface of the blocking piece 6, and an adhesive is applied to the end of the taper pin 7 to prevent it from coming off, thereby fixing the taper pin 7. Next, the receiver 4 is press-fitted into the bottom of the first counterbore hole from the top, and the lead wire 2 is further fixed with copper powder 3 by the copper powder fixing method.

The automatic stop brush of the present invention is constructed as described above, and when the brush reaches its wear limit, the cutoff piece 6 pops out onto the commutator 8 surface as shown in FIG. 4, and the current is instantly cut off and the motor is stopped. Furthermore, the second
In the figure and FIG. 4, 3 is copper powder.

According to this invention, assembly time is reduced by about 2/3,
Furthermore, since no silver-based adhesive is used, the cost can be significantly reduced. Furthermore, since the current interrupting mechanism is locked by a pin, there is no danger of the lead wires popping out.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a conventional automatic stop brush, FIG. 2 is a partially sectional front view of an automatic stop brush according to an embodiment of the present invention, FIG. 3 is a side view thereof, and FIG.
The figure is a sectional front view showing a state in which the current interrupting mechanism is activated. Explanation of symbols, 1... Brush body, 2... Lead wire, 3... Copper powder, 4... Receiver, 5... Spring, 6... Shutoff piece, 7... Taper pin, 8
... Commutator.

Claims (1)

[Scope of utility model registration request] A receiver is arranged at the bottom of the first counterbore hole from the top of the three counterbore holes formed on the head of the brush body, the lead wire is fixed to the top of the receiver, and the second counterbore hole from the top is fixed to the top of the receiver. In an automatic stop brush in which a spring is inserted and a shutoff piece is inserted into the second and third counterbore holes from the top, a spring is inserted directly below the receiver and at the top of the second counterbore hole from the top in the thickness direction. Or form a through hole in the width direction,
A pin is inserted through this through hole, and the end of the pin is fixed in the through hole, and a spring of the current interrupting mechanism is inserted in a compressed state into the counterbore hole at the bottom of the pin, and the spring causes the interrupter to An automatic stop brush that is inserted while being pressed downward.