| 摘要 |
PCT No. PCT/EP88/00970 Sec. 371 Date Apr. 27, 1990 Sec. 102(e) Date Apr. 27, 1990 PCT Filed Oct. 27, 1988 PCT Pub. No. WO89/04073 PCT Pub. Date May 5, 1989.A spring carbon brush which can be slid into a holder is blocked in the corresponding feed position on the holder when acted on by forces opposed to the direction of feed by a catch or expansion device in such a way that it can only move in the direction opposed to the direction of feed by overcoming an additional, preferably gradual, elastic force.
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