Rotatable captivated nut

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

Patent

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Details

F16B 37/04 (2006.01)

Patent

CA 2584315

A captive clinch nut may be rotatably attached to an apertured sheet. The nut includes a body having an axial threaded bore and a flange forming a base of the nut body. The flange includes a surface on a bottom side thereof preferably unitary therewith for providing a bearing surface of reduced friction against the sheet. A displacer unitary with the nut body is located directly below the flange and has an outside diameter less than an outside diameter of the flange. A tubular flared shank unitary with the nut body extends coaxially from the displacer, and includes a neck immediately adjacent the displacer with an outside diameter less than the outside diameter of the displacer forming an undercut area between the outside of the shank and an underside of the displacer for receiving the cold flow of metal of the sheet.

Un écrou-rivet captif peut être fixé rotatif sur une tôle trouée. L'écrou est composé d'un corps pourvu d'un trou fileté axial et d'une collerette formant la base du corps de l'écrou. De préférence, une surface solidaire de la collerette, présente sur le côté inférieure de cette dernière, sert de surface portante à frottement réduit contre la tôle. Un piston auxiliaire, solidaire du corps de l'écrou, se situe directement en dessous de la collerette et présente un diamètre extérieur inférieur à celui de la collerette. Une tige évasée tubulaire solidaire du corps de l'écrou, s'étendant coaxialement du piston auxiliaire, comprend un collet immédiatement adjacent au piston auxiliaire dont le diamètre extérieur est inférieur à celui du piston auxiliaire, qui forme une zone de dégagement entre l'extérieur de la tige et la face antérieure du piston auxiliaire pour recevoir l'écoulement de métal froid de la tôle.

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