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US 3,940,214 AGranted
Drill bit with deburring device
OwnerDaryl E. Waschekinventor
Life of this patent
Estimating the term…
Abstract
A twist drill bit for drilling through metal and having a cutter recessed in the spiral portion of the drill auger and spring tensioned to be biased outwardly beyond the peripheral surface of the drill to remove burrs raised by the drill bit as it passes through the metal in either direction.
Claims5
In a drill bit for drilling a hole through a piece of metal whereby burrs are formed on the edges of the hole, said bit having a shank for connection to a power source and a boring body comprising spiral auger portions separated by spiral grooves,
- a. one of said spiral auger portions having an outwardly opening recess therein,
- b. a deburring attachment disposed in said recess for radial sliding movement between outwardly extended and retracted positions,
- c. stop means on the auger portion engaging said attachment to limit outward sliding movement thereof,
- d. spring means disposed between the bit and the attachment yieldably biasing the attachment toward its outwardly extended position, and
- e. said attachment including a cutter having a sharp outer cutting edge projecting beyond the peripheral surface of the auger portion to remove said burrs from the metal portions surrounding the hole.
2 more elements
Dependencies are inferred from the claim text.