| 摘要 |
An additional security device for cylinderlocks and similar ones, does not allow the activation of the lock to perform its functions, if the key is not completely inserted into the keyhole. This is accomplished by a little cylindrical (3) kept in its position by a spring (8) and carrying an anchoring pin (4) which does not allow the rotating body (2) of the lock to rotate, if the tip of the key does not make it possible to push out the anchoring pin from an appropriate housing (5) made on the fixed body (1) of the lock.
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