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US Patent: 4,509X
Mode of turning any number of augers
Mortising machine
Harden Branch - New York, NY

USPTO Classifications:

Tool Categories:
woodworking machines : wood drilling and boring : mortising machines
woodworking machines : joint making machines : mortising machines
woodworking tools : hand drills : drill bits


Not known to have been produced


Patent Dates:
Granted: Aug. 07, 1826

Patent Pictures: [ 1 | 2 ]
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This is the first patent for a hollow-chisel mortiser, although the patent title suggests that the hollow chisels were not covered by the claims. (As is the case for many X-series patents, only a drawing survives; in fact, most of the drawings were made from the patent models after the 1836 patent-office fire.) The drawing shows multiple chisel-and-bit sets mounted horizontally and driven by a crank through gearing. As the mortising bits are cranked around, the workpiece advances towards the bits. It seems that this invention was not successful, and Greenlee Brothers & Co. can rightly claim (as they do in a 1942 mortiser brochure) that "in 1876 the first successful mortiser was developed by Greenlee Bros. & Co." Nonetheless, this machine is often listed as the genesis of the hollow-chisel mortiser. For example, "Important Events of the Century" by the United States Central Publishing Co., 1876, says, "Square Hole Auger.---Invented by Branch in 1826." A similar mention is made in "Knight's American Mechanical Dictionary" of 1874, which also says, "Hancock's Square Hole Borer (English) was in operation about the same time in London, and operated in a substantially similar manner."

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