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US Patent: 199,285
Improvement in mortising and boring machines
Robert L. Greenlee - Chicago, IL
Ralph S. Greenlee - Chicago, IL

USPTO Classifications:

Tool Categories:
metalworking machines : drilling and boring
woodworking machines : wood drilling and boring
woodworking machines : wood drilling and boring : mortising machines
woodworking machines : joint making machines : mortising machines


Greenlee Brothers & Co. - Rockford, IL

G. L. Chapin
William M. Goggin

Patent Dates:
Granted: Jan. 15, 1878

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"Vintage Machinery" entry for Greenlee Brothers & Co.
The machine in this patent is considered the first successful hollow chisel mortiser design. This machine has two major differences from the typical American-designed hollow-chisel mortiser. First, it's a horizontal machine rather than vertical. Second, the drill and chisel enter the work from opposite sides. This is mechanically simpler but is limited to through-mortises only, plus bad things could happen if either drill or chisel gets deflected.

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