Security screw

Details Security screw Security screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 39/02 (2006.01)

Patent

CA 2686080

Safety screw, having a cylindrical body (3) at least partly divided into two portions, (1a, 1b), in the threaded section (4) thereof with a partition line which runs at least partly along the axial axis (7) thereof, or proximate thereto. In one of said parts (1a, 1b) a coaxial cylindrical sector (8) has been removed (maximum eccentricity: 1% of the radius of the thread), due to which both parts can have an oscillatory movement with each other, aligning or dealigning their respective screw threads depending on the relative angular position thereof. Depending of the position of the eliminated sector (8), the nut (5) can screw but not unscrew, or vice-versa. Additionally, means are provided for unlocking the nut (5), by immobilizing said parts (la, Ib) in the relative angular position in which their screw threads are aligned.

L'invention concerne un boulon de sécurité (1) constitué d'un corps cylindrique (3) divisé en deux parties (1a, 1b) au niveau de sa zone filetée (4), avec une ligne de séparation (6) suivant au moins partiellement son axe axial (7) ou proche de ce dernier. Ce boulon se caractérise par le fait qu'une des deux parties (1a, 1b) a été amputée d'un secteur cylindrique (8) coaxial (excentricité maximale: 1% du rayon du filet), ce qui signifie que les deux parties peuvent avoir un mouvement oscillatoire entre elles, les filets des filetages respectifs étant alignés ou non en fonction de leur position angulaire relative. Selon la position du secteur (8) amputé, l'écrou (5) peut être vissé, mais pas dévissé, ou inversement. En outre, l'invention comprend également des moyens permettant de débloquer l'écrou (5), immobilisant lesdites parties (1a, 1b) dans la position angulaire relative dans laquelle les filets du filetage sont alignés.

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