| 摘要 |
PCT No. PCT/GB94/02306 Sec. 371 Date Oct. 21, 1996 Sec. 102(e) Date Oct. 21, 1996 PCT Filed Oct. 20, 1994 PCT Pub. No. WO95/18457 PCT Pub. Date Jul. 6, 1995A safety switch assembly for use with a machinery guard enclosing kinetic machinery, comprises a housing, an electrical contact arrangement and a rotatable actuator cam contained within the homing for operating the electrical contact arrangement and spaced from the electrical contact arrangement. Radial pockets are formed in the actuator cam and extend inwardly of the periphery of the latter. An axially-movable rod connects the electrical contact arrangement and the actuator cam to operate the former in accordance with rotational movement of the latter. The housing defines at least one entry adjacent the actuator cam for insertion of an actuator into the housing to engage the radial pockets to rotate the actuator cam. Anti-rotational locking means releasably engage the actuator cam to prevent rotation of the latter and consequent operation of the electrical contact arrangement until a separation of the actuator cam and the anti-rotational locking means is effected by the actuator. A solenoid-operated claw is disposed alongside the actuator cam for engaging a locking formation of the actuator to secure the actuator in engagement with the actuator cam to maintain the electrical contact arrangement in a power supply ON condition. The actuator has lateraly-spaced limbs insertible between the actuator cam and the anti-rotational locking means axially to space same apart, and (ii) engageable with the actuator cam to rotate same axially to move the rod to operate the electrical contact arrangement. It also has a locking formation engageable by the solenoid-operated claw to secure the actuator in engagement with the actuator cam to maintain the electrical contact arrangement in the power supply ON condition. |
