US Patent: 3,417,639 - Planetary Speed Change Transmission for Machine Tool Feed Drives


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US Patent: 3,417,639

Planetary Speed Change Transmission for Machine Tool Feed Drives

Patentees:

Earl E. Johnson (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

Walter L. McCann (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

USPTO Classifications:

475/279, 475/282

Tool Categories:

metalworking machines : metalworking machine mechanisms : metalworking power transmission

Assignees:

Giddings & Lewis, Inc. - Fond Du Lac, Fond Du Lac County, WI

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Apr. 06, 1966
Granted:	Dec. 24, 1968

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.

Description:

Abstract:

A machine tool feed drive transmission is described in which three modular planetary transmission units are stacked in series to effect a large number of closely spaced output speed steps in an upper range, and a plurality of more widely spaced steps in a lower range, and in which a differential planetary gear set is employed to achieve both up-drive and down-drive output speed ratios in the first transmission unit.