Improved hole cutting tool

Details Improved hole cutting tool Improved hole cutting tool

B - Operations, Transporting

23

D

B23D 51/04 (2006.01) B23B 51/04 (2006.01) B23D 61/12 (2006.01)

Patent

CA 2223613

An improved hole (8) saw for cutting holes having a cylindrical shape that includes, along its cutting edge (12), a plurality of repetitive groups of saw teeth having at least four radially displaced trailing teeth (22-25). The displacement of each trailing tooth (e.g. 24, 25) is such that it has a substantially greater displacement than for any other tooth (e.g. 22, 23) of said group preceding said trailing tooth. The displacement of each tooth being such that the cutting edge thereof is characterized as being movable along a cutting path different from the cutting paths of the other teeth of the group as the hole saw is rotated whereby each tooth cuts chips of uniform size. Each group of teeth may include a raker tooth (21) having no substantial displacement with respect to the side surfaces of (11, 15) the hole saw (8). The raker tooth (21) may be the same height or of greater height than the trailing teeth (22-25).

L'invention concerne une scie (8) améliorée pour le découpage d'orifices de forme cylindrique, qui comprend le long de son bord tranchant (12), plusieurs groupes répétitifs de dents de scie ayant au moins quatre dents arrière (22-25) se déplaçant radialement. Le déplacement de chaque dent arrière (par ex. 24, 25) est conçu de telle manière qu'il soit sensiblement plus grand que celui de n'importe quelle autre dent (par ex. 22, 23) du groupe précédent ladite dent arrière. Le déplacement de chaque dent s'effectue de sorte que la partie de cette dernière puisse se déplacer le long d'un chemin de coupe différent de ceux des autres dents du groupe lorsque la scie à couper des trous tourne chaque dent coupant des fragments de taille uniforme. Chaque groupe de dents peut comprendre une dent-rabot (21) ne se déplaçant sensiblement pas par rapport aux surfaces latérales (11, 15) de la scie à couper des trous (8). La hauteur de la dent-rabot (21) peut être identique ou supérieure à celle des dents arrière.

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