US Patent: 199,285 - Improvement in mortising and boring machines


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US Patent: 199,285

Improvement in mortising and boring machines

Patentees:

Ralph S. Greenlee (exact or similar names) - Chicago, IL

Robert L. Greenlee (exact or similar names) - Chicago, IL

USPTO Classifications:

144/78

Tool Categories:

metalworking machines : drilling and boring

woodworking machines : wood drilling and boring : mortising machines

woodworking machines : joint making machines : mortising machines

Assignees:

None

Manufacturer:

Greenlee Brothers & Co. - Rockford, IL

Witnesses:

William M. Goggin

G. L. Chapin

Patent Dates:
Applied:	May 18, 1877
Granted:	Jan. 15, 1878

Patent Pictures:

USPTO (New site tip)
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Vintage Machinery entry for Greenlee Brothers & Co.

Description:

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.