| 摘要 |
A bellcrank lever has a locking cut-out with an oblique edge towards the end of one leg and a second leg which engages a notch in a switch. A blocking lever has a blocking lug at its free end which engages the locking cut-out. Insertion of the key swivels the blocking lever clockwise and swivels the bellcrank lever counter-clockwise out of engagement with the switch notch. Withdrawing of the key causes the levers to swivel in the opposite directions. The blocking lug then engages an extension in the locking cut-out and blocks the counter-clockwise swivel of the bellcrank.
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