Self perforating and thread forming connecting element

Details Self perforating and thread forming connecting element Self perforating and thread forming connecting element

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/00 (2006.01)

Patent

CA 2234092

A self-perforating thread-forming screw has a single or multiple thread which is designed for screwing into soft materials such as wood, plywood or composite materials without predrilling. The screw has a low tightening moment and a high loosening and pull-out moment. The thread of the screw at the screw tip is shaped to provide good radial displacement of the material with low moments while also contributing to a high retaining force. Efficient radial displacement of the material at the screw tip as opposed to efficient cutting of the material produces this desired result.

Une vis autoperceuse et taraudeuse a un filetage simple ou multiple conçu pour pénétrer des matériaux tendres, tels que le bois, le contreplaqué et les matériaux composites, sans perçage préalable. La vis a un faible moment de serrage et un moment élevé de desserrage et d'extraction. Sur la pointe de la vis, le filet est formé de façon à assurer un bon déplacement radial du matériau avec de faibles moments, tout en contribuant à une force de retenue élevée. Ce résultat recherché est obtenu grâce au déplacement radial efficace du matériau à la pointe de la vis par opposition à une coupe efficace du matériau.

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