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US Patent: 1,264,370
Lloyd Groff - Flint, MI

USPTO Classifications:
279/103, 408/226, 408/231

Tool Categories:
metalworking machines : drilling and boring : drill bits : metalworking twist drills

Dean F. Carscadden - Flint, MI

Not known to have been produced

none listed

Patent Dates:
Applied: Mar. 08, 1917
Granted: Apr. 30, 1918

Patent Pictures:
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Ralzemond A. Parker - patent attorney

This invention relates to drills and has for its object a drill that is associated with a supplemental tang constructed to give way under unusual loads to protect the more expensive drill. Inasmuch as some of the drills now used are made of expensive high speed tool steel, it is a great advantage to have means for protecting these drills from destruction in case of an over-load.

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