Damaged bolt and screw removing devices
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United States of America Patent
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Jun 3, 2014
Grant Date -
Nov 15, 2012
app pub date -
May 23, 2012
filing date -
Apr 25, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by traction or biting surfaces formed from two-sided frusto-conically-shaped regions. The surfaces are bounded on one side by a nonlinear cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis, where the biting surfaces comprise a plurality of serrations, and where the cutting edges are separated by flutes which spiral along a longitudinally extending periphery of the bit.
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