Spade bits with angled sides
AssigneeMaxtech Manufacturing Inc.
InventorKailash C. Vasudeva
Life of this patent
Estimating the term…
Abstract
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.
Claims14
A spade drill bit comprising:
- a shaft;
- a spade head portion arranged on said shaft, said head portion having a rearward facing bottom edge, two longitudinal sides and a forward facing cutting edge having a pointed, generally triangularly shaped tip and outer ends,
- wherein said longitudinal sides of said head portion are bent along a bend in a direction of rotation of said drill bit during operation, so that said outer ends are bent forwards in said rotating direction, and wherein said bend runs from a first position at one of said longitudinal sides or said bottom edge, to a second position at said cutting edge between said outer end and said tip,
- wherein said cutting edge comprises arced cutting portions arranged between said outer ends and said tip, said arced cutting portions being generally U-shaped.
Dependencies are inferred from the claim text.