| 摘要 |
The invention relates to a security device for door locks having the effect of closing off the hole through which the key enters the pipe of the lock, and also the end of the said pipe so as to incorporate it into the external face of the door. The device according to the invention includes: a) a cylindrical ring (1), the internal diameter of which is greater than that of the pipe (2), fixed, particularly by welding (3), to the body (4) of the lock, coaxially surrounding the said pipe and also passing through the wall (5) of the door, from the inside to the outside, without extending beyond the external face (8) of this door; b) a plug (6) including a cylindrical part (7), the internal diameter of which is slightly greater than that of the pipe, and the external diameter of which is slightly less than the internal diameter of the cylindrical ring at the end of which the said cylindrical part is accommodated in order to close off the hole through which the key is inserted into the pipe. <IMAGE>
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