| 摘要 |
<p>A magnetically operable safety switch arrangement includes a safety switch 1 and an actuator 2. The safety switch 1 includes an array of at least four magnet sensors (H1-4, fig 4). At least two sensors are arranged to be triggered by a magnetic field with a first orientation, and those two sensors are separated by at least one sensor arranged to be triggered by a magnetic field with a second, opposite, orientation, the switch being arranged to change state when all four sensors have been triggered. The actuator includes an array at least four magnets 3 arranged to trigger all the sensors (H1-4, fig 4) of the switch when the actuator is brought within a predetermined distance of, and alignment with, the safety switch. The safety switch may include relays, preferably at least two normally open relays connected in series and/or at least two normally closed relays connected in parallel.</p> |
