| 摘要 |
A micro-switch comprises at least one coil (22) of elongate electrically conductive material mounted on the support means (16). A movable actuator portion (20) of electrically conductive material is attached to the support means (16) so as to be movable against resilient means (10) of the micro- switch and so as to be adjacent to the coil (22). Pulse inductive circuitry (30, 32, 34, 36, 43a, 52, 54) is connected to the said at least one coil (22 ), and constructed to switch from one condition to another when the actuator portion (20) is moved against the force of the resilient means (10) beyond a predetermined threshold point as indicated by pulsoinductive monitoring effected by the pulse inductive circuitry (30, 32, 34, 36, 43a, 52, 54). As a result of this construction, there are no physical contacts which are brough t into and out of contact with one another to effect the change in the electrical condition of the micro-switch.
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