US Patent: 4,080,009 - Servostatic Bearing System With Variable Stiffness


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US Patent: 4,080,009

Servostatic Bearing System With Variable Stiffness

Patentees:

Sharad M. Marathe (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

Bruce C. Cuppan (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

Orville W. Ehrhardt (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

Joseph C. Scherer (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI

USPTO Classifications:

108/143, 108/20, 384/12, 384/15

Tool Categories:

metalworking machines : metalworking machine mechanisms : metalworking machine bearings

Assignees:

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

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Sep. 29, 1976
Granted:	Mar. 21, 1978

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:

The invention provides a hydraulically sealed, variable stiffness servostatic bearing system for use in machine tools and between any other loaded surfaces. Bearing pads operate between two relatively movable surfaces. A pilot valve senses changes in the bearing surface spacing and communicates by pressure variations with a diaphragm controlled restrictor valve. The diaphragm controlled restrictor valve apportions proper amounts of hydraulic fluid at proper pressure to the bearing pads. The combination results in a bearing system the stiffness of which is adjustable from positive to infinite to negative by the source hydraulic pressure to the diaphragm restrictor valve. A lift bladder and a modular bearing pad assembly to facilitate easy and quick installation and removal of bearing pads are also described.