| 摘要 |
The anti-theft device with bolt, according to the invention, is intended for protection against access by burglary to locked enclosures , and consists of a metallic body [1] having a parallelepipedal window [b] for two ear-type elements [4] fixed with two straps [5], each with a pair of countersunk screws [6], a tubular key [3] provided with two keyways [j], the bolt being arched by a spiral spring [7] and provided with two grooves [e] corresponding to the keyways [j], the angular position (α) of the two grooves, the length of each groove, the internal diameter and the external diameter of the key being the variable parameters of the device which assure the uniqueness of the device.
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