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US Patent: 5,535,638
Antifriction Screw Drive
Patentee:
Robert H. Willison (exact or similar names) - Cincinnati, Hamilton County, OH

USPTO Classifications:
74/424.84

Tool Categories:
metalworking machines : metalworking machine mechanisms : metalworking power transmission

Assignees:
Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Nov. 10, 1994
Granted: Jul. 16, 1996

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Joel Havens
"Vintage Machinery" entry for Cincinnati Milling Machine Co.
Description:
Abstract:

A screw and nut have intermeshed helical threads which may be of a form selected from a variety of shapes; for example, a buttress thread. A ball track is formed by cooperating grooves in opposing flanks of the screw and nut threads, and a circuit of balls are disposed within the ball track. The result is a screw system with improved thrust load-carrying capability.

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