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US Patent: 45,483
Improvement in Tools for Boring Holes
Bit for Undercut Holes
Augustus Eliaers - Boston, MA

USPTO Classifications:
408/26, 82/1.5

Tool Categories:
woodworking tools : hand drills : drill bits


Not known to have been produced

Joseph Gavett
Thomas J. Mayall

Patent Dates:
Granted: Dec. 20, 1864

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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By means of a pivoting cutter with two cams and a threaded sleeve and nut/handle arrangement, this bit is designed to be able to produce an undercut hole. I. e. the hole is larger at the bottom than the top - ..."especially desirable for the insertion of rubber or other elastic studs or buttons, which are firmly held therein."

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