| 摘要 |
Two magnetic stops (4) are used, each comprising an iron plate, whilst the magnetic body is a permanent magnet (5). For a switch function, a half-effect indicator is fitted to at least one of the stops, and a permanent magnet is fitted in the rocker arm for each of the stops. Alternatively, only one permanent magnet is provided for one of the stops. The rotary axis (3) of the rocker arm (2) is arranged displaceably in a plane running at right-angles to the arm with the stops flat in formation. The arm is fitted rockably around a shaft running through a hole in it, the hole being oblong in shape and of a length so that the arm, apart from its two rocking positions, may also adopt a third position, in which it simultaneously rests against both stops. |
