Head of a countersunk screw

Details Head of a countersunk screw Head of a countersunk screw

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 35/06 (2006.01)

Patent

CA 2677270

The invention relates to the head of a countersunk screw with a lower side which has at least one supporting surface (2), which forms part of a rotational surface about the screw axis (7) and can nestle against a correspondingly contoured countersunk surface (11) of an add-on part (10), and has at least one depression (6) which is delimited by a cutting edge (4) at its end which runs downwards, as seen in the screwing-in direction (e) of the countersunk screw. The invention is distinguished in that in front of the supporting surface (2), as seen in the screwing-in direction (e), there is an approach surface (3) which butts against said supporting surface, is inclined radially inwards and, at its upwardly running, free end, has the cutting edge (4) which, over its length, maintains a radial distance (a) from the rotational surface to the inside.

La présente invention concerne une tête de vis à tête fraisée présentant un côté inférieur qui présente au moins une surface d'appui (2) qui forme une partie d'une surface de rotation autour de l'axe (7) de la vis et peut s'adapter à une surface chanfreinée (11) de contours correspondants d'une pièce rapportée (10); et au moins un retrait (6) qui est délimité par une arête coupante (4) à son extrémité descendante lorsque l'on considère la vis dans son sens de vissage (e). L'invention se caractérise en ce que, lorsque l'on considère la vis dans son sens de vissage (e), une surface d'avancement (3) inclinée radialement vers l'intérieur, contiguë à la surface d'appui (z), se trouve en amont de ladite surface d'appui, la surface d'avancement présentant à son extrémité montante libre l'arête coupante (4) qui garantit la préservation d'un espace radial (a) vers l'intérieur sur sa longueur par rapport à la surface de rotation.

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