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US Patent: 2,168,282
Circular saw
Patentee:
Herbert E. Tautz - Milwaukee, WI

USPTO Classifications:
83/102.1, 83/473

Tool Categories:
woodworking machines : circular saws : tablesaws

Assignees:
Delta Manufacturing Co. - Milwaukee, WI

Manufacturer:
Delta Manufacturing Co. - Milwaukee, WI

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 18, 1936
Granted: Aug. 01, 1939

Patent Pictures:
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"Vintage Machinery" entry for Delta Manufacturing Co.
Description:
This patent is quite interesting because it shows what is believed to be a proto-Unisaw. This patent covers a tilting-arbor mechanism that is somewhat similar to the mechanism ultimately used in the Unisaw. The actual Unisaw mechanicals were covered in patents 2,265,407 and 2,265,408.

"It has been usual in circular saws of the tilting arbor type to place the saw arbor and driving motor therefor on the same tiltable support, which has subjected the support and its pivotal mounting to a relatively heavy load. In other cases, the saw has been belt-driven from a counter-shaft or non-tilting motor, necessitating twisting of the driving belt when the arbor is tilted. An object of the invention is to provide a circular saw of the like in which the cutter arbor and a driving motor therefor are carried on separate tiltable supports, so as to relieve the arbor mounting of excessive weight and torsional stresses, both supports being tiltable together to maintain the same relative position of arbor and motor." Other objectives were to mount the motor at the rear of the saw, to keep belt tension constant, and provide a trunnion which is of "strong but inexpensive construction."

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