| 摘要 |
PURPOSE:To eliminate damaging a rectifier and simplify the construction of an apparatus by using an electric discontinuity through dissipation of a conductive powder. CONSTITUTION:A notch 2 is provided in the top surface of a power tool brush 1 and a tap 3 is cut on the inner surface of aid notch 2. The lowermost part of said notch 2 is filled with graphite powder 4 processed into granules. A lead wire 6 is passed through and fixed in the central part made of resin, the other end of said lead wire 6 is caused to support a stop for preventing the wire from coming off, and the lead wire 6 is inserted into the graphite powder 4. After that, the cap 5 is screwed into said tap 3 to constitute the whole apparatus. |
