Self-locking threaded fastening assembly

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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Details

F16B 39/34 (2006.01)

Patent

CA 2397631

A bolt (10) with a partially threaded shank has a plurality of locking grooves located on the shank between the thread and its head (11). The bolt (10) is inserted through a component stack and spacing washers and a stepped reaction washer such that at least half of the locking grooves (13) are left exposed. A deformable frusto-conical locking ring (17) is positioned on a nut (15) having a circular receiving cavity on one end. The nut (15) and locking ring (17) are positioned on the thread (14) of the bolt (10) and tightened so that the locking ring (17) is deformed from a frusto-conical shape to a substantially flat disc such that its bore diameter is reduced, thereby retaining it within one of the locking grooves (13). The outer diameter of the receiving cavity (16) abuts the stepped reaction washer (18).

La présente invention concerne un boulon (10) doté d'une tige partiellement filetée, présentant une pluralité d'encoches de verrouillage se trouvant sur la tige entre le filet et la tête (11). Le boulon (10) est inséré à travers un ensemble d'éléments superposés, des rondelles d'espacement et une rondelle de réaction segmentée, de sorte qu'au moins la moitié des encoches de verrouillage (13) reste exposée. Un anneau de verrouillage frusto-conique déformable (17) est placé sur un écrou (15) présentant une cavité de réception circulaire à l'une de ses extrémités. L'écrou (15) et l'anneau de verrouillage (17) sont placés sur le filet (14) du boulon (10) et serrés de sorte que l'anneau de verrouillage (17) se trouve déformé à partir d'une forme frusto-conique pour donner un disque sensiblement plat, le diamètre d'alésage se trouvant ainsi réduit de manière à retenir le boulon dans les encoches de verrouillage (13). Le diamètre extérieur de la cavité de réception (16) est adjacent à la rondelle de réaction segmentée (18).

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