Masonry drill bit

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 51/00 (2006.01)

Patent

CA 2642319

A masonry drill bit includes a cutting insert (3) which is substantially roof- shaped in sideview and has on each side of its "roof" one lip (6). Each lip (6) includes a leading cutting surface (7) and a trailing free surface (8), wherein the mutually abutting free surfaces (8) at the roof ridge (9) define a chisel edge (10). Each free surface (8) is concave in a sub-zone (8a) adjacent to the chisel edge (10) in a manner that the radially outer ends (11 ) of the chisel edge (10) axially protrude at the end face (12) of the insert (3) relative to the in-between center of the chisel edge (10). Each lip (6) includes at least one recess (13) and to that extent deviates from the substantially roof-shaped geometry.

Foret pour maçonnerie comprenant une plaquette (3) de coupe présentant sensiblement la forme d'un toit en vue de côté et dotée d'une lèvre (6) de chaque côté dudit toit. Chaque lèvre (6) comprend une face avant (7) de coupe et une face (8) de dépouille dégagée, tandis que les surfaces (8) dégagées en appui mutuel au faîte (9) du toit définissent une arête (10) de ciseau. Chaque surface (8) dégagée est concave dans une sous-zone (8a) adjacente à l'arête (10) de ciseau de telle manière que les extrémités extérieures (11) dans le sens radial de l'arête (10) de ciseau dépassent axialement au niveau de la face terminale (12) de la plaquette (3) par rapport au centre de l'arête (10) de ciseau situé entre celles-ci. Chaque lèvre (6) comprend au moins un renfoncement (13), s'écartant en cela de la géométrie sensiblement en forme de toit.

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