Patent ID: 9724764
Date: 2017-08-08
CPC Classifications: B23B,B27G,Y10T

Claim:
1. A spade bit, comprising: a shaft defining an axis about which the spade bit is configured to be rotated; and a blade operably connected to the shaft and extending forwardly from the shaft, the blade having a first paddle portion and a second paddle portion, wherein the first paddle portion includes (i) a first leading end portion defining a first cutting edge portion which extends to an outermost portion of the first leading end portion at a first maximum distance directly radially outward from the axis, and (ii) a first lateral extension portion defining a first sloping surface which slopes forwardly from a first outer portion to a first inner portion closer to the axis, the first inner portion at a first minimum distance directly radially outward from the axis, wherein the first paddle portion defines a first relief space positioned adjacent to both the first sloping portion and the first leading end portion, wherein the first minimum distance is less than the first maximum distance, wherein the second paddle portion includes (i) a second leading end portion defining a second cutting edge portion, and (ii) a second lateral extension portion defining a second sloping surface which slopes forwardly from a second outer portion to a second inner portion closer to the axis, and wherein the second paddle portion defines a second relief space positioned adjacent to both the second sloping portion and the second leading end portion.