Self-drilling and thread-forming connecting element

Details Self-drilling and thread-forming connecting element Self-drilling and thread-forming connecting element

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/10 (2006.01) F16B 33/02 (2006.01) F16B 35/04 (2006.01)

Patent

CA 2365947

The invention relates to a self-drilling and thread-forming connecting element, especially a screw (1), comprising a threaded shaft (2) that consists of a cylindrical core (8) and of a thread (10) that is formed as a protuberance on said core (8). The inventive connecting element also comprises a drilling tip (4) at one end for drilling a core hole for the thread (10). In order to enable a problem-free use for, in particular, frontal screwed connections in MDF boards (MDF = medium density fiber board), the drilling tip (4) defines a core hole drilling diameter (DB) which is larger than the diameter (DK) of the cylindrical core (8) of the threaded shaft (2) and is smaller than a diameter (DG) of the thread defined by an outer thread edge (12) of the threaded shaft (2).

L'invention concerne un élément de liaison auto-foreur et taraudeur, notamment une vis (1), comprenant une tige filetée (2) constituée d'un noyau cylindrique (8) et d'un filet (10) en saillie sur le noyau (8). L'extrémité de la tige (2) est dotée d'une pointe (4) permettant de percer un prétrou destiné au filet (10). Pour une utilisation sans problème notamment pour des vissages sur la face frontale de panneaux de fibres moyenne densité, la pointe de perçage (4) définit le diamètre de perçage d'un prétrou (DB), qui est supérieur au diamètre (DK) du noyau cylindrique (8) de la tige filetée (2) et inférieur à un diamètre de filet (DG) défini à partir d'un bord de filet extérieur (12) de la tige filetée (2).

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