| 摘要 |
PCT No. PCT/JP94/02226 Sec. 371 Date Nov. 21, 1996 Sec. 102(e) Date Nov. 21, 1996 PCT Filed Dec. 27, 1994 PCT Pub. No. WO95/32514 PCT Pub. Date Nov. 30, 1995An oscillation switch consists of a pair of ring-shaped electrodes each having an inner surface coaxially provided with a projection and spaced apart at a predetermined distance, and balls arranged in a space formed between the electrodes so that the balls engage the projections to electrically connect the electrodes together when oscillation or lateral sliding occur. A portable electrically driven machine provided with the oscillation switch has the oscillation switch provided on a frame and has a structure which stops a tool rotating motor and a feed motor by interrupting the electric power supply to a control unit of the electric tool. The use of the oscillation switch allows the tool rotating motor or the feed motor to stop as soon as lateral sliding or oscillation starts to occur or when the portable electrically driven machine starts to fall down even if the portable electrically driven tool takes any posture.
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