Hole-drilling device for drilling hole with expanded diameter hole portion
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United States of America Patent
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Apr 24, 2018
Issued Date -
N/A
app pub date -
Aug 6, 2014
filing date -
Aug 23, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A device for drilling a hole with an expanded diameter includes: a body, a shank; a sleeve; a compression spring; a drill bit body; an expanded diameter hole portion forming member attached to a side surface of the drill bit body and configured such that a cutting bit protrudes laterally from the drill bit body when the expanded diameter hole portion forming member moves forward on the side surface; a compression spring, which urges the expanded diameter hole portion forming member rearward relative to the drill bit body; and a cam. The expanded diameter hole portion forming member is configured to move forward on the side surface of the drill bit body owing to rotation of the cam when the body moves forward relative to the sleeve.
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