| 摘要 |
<p>Reusable security screw (or nut), provided to be exclusively tightened with a specific wrench, and to be exclusively loosened with another different specific wrench. It has a head divided into three sets of angular sectors: a) sectors for tightening support (2, 5) which receive the force from the first wrench in order to rotate the screw in a rotational direction; b) sectors for loosening support (3, 6) which receive the force from the second wrench in order to rotate it in the opposite direction; and c) sectors for tightening or loosening (1, 4) which receive the forces from both wrenches. The angles of the different sectors can be modified from one production batch to another in order to increase their inviolability.</p> |
