| 摘要 |
The present invention relates to a protecting device for the lock of doors being constituted of a housing made of a strong material, e.g. reinforced steel mounted in a rigid, tight manner on said lock and being provided with a bore located opposite the cylinder and fitting the size of the key, protecting means, e.g. plates, arms, etc. covering the the cylinder and actuated by d spring for the cylinder located between the housing and the cylinder, said protecting means being coupled to alarm actuating means, e.g. a micro-sensor. The protecting device may be provided with additional parts as a time, a des-activating device, e.g. a micro-sensor, sensitive sensors. The alarm device of said protecting device may be an integral part thereof or be far-distanced.
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