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US Patent: 42,863
Improvement in machines for boring angular holes
Benjamin Merritt, Jr. - Newton, MA

USPTO Classifications:
144/104, 408/111, 408/214, 408/3

Tool Categories:
metalworking machines : drilling and boring
woodworking machines : joint making machines : portable timber mortisers
woodworking machines : wood drilling and boring : portable timber mortisers
woodworking machines : wood drilling and boring


Not known to have been produced

L. L. Tower
F. B. Webster

Patent Dates:
Granted: May 24, 1864

Patent Pictures: [ 1 | 2 ]
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This patent is mentioned in "Knight's American Mechanical Dictionary" of 1874: "MERRITT'S Machine for boring Angular Holes, May 24, 1864. The holes are bored by rotary cutters; fixed, and reciprocating in a plane at right angles to the axis of the hole. The relatively fixed auger makes a round hole, as usual; certain cutters which partake of the circular motion have also a reciprocation towards and from their axis of rotation, being projected outward and again retracted four times in a rotation, to cut out the angles left by the round auger, thus making a square hole."

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