| 摘要 |
A indexing wheel mounted in the head assembly of a safety switch has an axis of rotation extending at right angles to the longitudinal axis of the plunger, and against whose lateral surface the plunger bears. A key channel in the head assembly is adapted for receiving a key and into which the indexing wheel projects. A key, upon being inserted into and upon being withdrawn from the key channel positively rotates a cam plate about its axis of rotation and switches over the switch. The switch and key is maintained in locked status by action of the locking hole on the cam pin and by action of the plunger when a key is inserted into the head assembly where the plunger becomes inserted in the locking hole of the indexing wheel and/or the flank on the cam pin after rotation by the key causing the key and switch to become locked.
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