Spade bits with angled sides

Details Spade bits with angled sides Spade bits with angled sides

B - Operations, Transporting

23

B

B23B 51/00 (2006.01)

Patent

CA 2372675

A spade drill bit has a shaft and a spade head portion arranged on the shaft. The head portion has a rearward facing bottom edge, two longitudinal sides and a forward facing cutting edge. The cutting edge has a pointed, generally triangularly shaped tip and outer ends. The longitudinal sides of the head portion are bent along a bend in a direction of rotation of the drill bit during operation, so that the outer ends are bent forwards in the rotating direction. The bend runs from a first position at one of the longitudinal sides, closer to the bottom edge than to the cutting edge, and to a second position at the cutting edge between the outer end and the tip.

Foret à trois pointes comprenant un arbre et une tête à trois pointes placée sur l'arbre. La tête comprend un bord inférieur arrière, deux bords longitudinaux et un bord avant coupant. Le bord coupant comprend une pointe généralement triangulaire et des extrémités extérieures. Les bords longitudinaux de la tête suivent une courbe orientée dans le sens de rotation du foret, de façon à ce qu'ils s'inclinent vers l'avant dans le sens de la rotation. La courbe s'étend d'une première position sur l'un des bords longitudinaux, plus près du bord inférieur que du bord coupant, à une seconde position sur le bord coupant, entre l'extrémité extérieure et la pointe.

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