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US Patent: 780,642
Speed-changing mechanism
Patentee:
William W. Earl - Worcester, MA

USPTO Classifications:
74/353

Tool Categories:
metalworking machines : metal planers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Penelope Comberbach
Rufus B. Fowler

Patent Dates:
Applied: Oct. 17, 1904
Granted: Jan. 24, 1905

Patent Pictures:
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Description:
"My present invention relates to a speed-changing mechanism especially designed to be employed with the reciprocating table of a metal-planing machine, whereby the speed of the table on its cutting stroke may be varied at will, which the speed of the table on its return stroke remains constant..."

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