US Patent: 30,672 - Method of hanging circular saws


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US Patent: 30,672

Method of hanging circular saws

Patentee:

David Eldridge (exact or similar names) - Philadelphia, PA

USPTO Classifications:

83/473

Tool Categories:

woodworking machines : circular saws : tablesaws

woodworking machines : human powered machines

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Samuel Chubb, Jr.

Benjamin Kellogg

Patent Dates:
Granted:	Nov. 20, 1860

Patent Pictures:

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Description:

This is the very first patent for a tilting-arbor table saw—at least, it is the very first patent where the arbor-tilting mechanism is claimed. Patent 37,816 is another early tilting-arbor saw. Patent 210,100 introduces trunnions rather than a physical hinge-pin in the tilting mechanism, which was the key innovation required to make a tilting-arbor design wholly practical.

The inventor mentions both "mills driven by steam and water power, for heavy work" and "portable machines working by a treadle" as possible applications of his invention. We have found no evidence that this saw was ever manufactured.