US Patent: 4,133,204 - Roughness Diagnostic Tool


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US Patent: 4,133,204

Roughness Diagnostic Tool

Patentee:

John Mittleman (exact or similar names) - Panama City, FL

USPTO Classifications:

73/105

Tool Categories:

layout tools : special purpose gauges

Assignees:

The United States of America as represented by the Secretary of the Navy - Washington, DC

Manufacturer:

Not known to have been produced

Witnesses:

none listed

Patent Dates:
Applied:	May 15, 1978
Granted:	Jan. 09, 1979

Patent Pictures:

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Description:

Richard S. Sciascia & Harvey A. David - patent attorneys

Abstract

A roughness measuring tool wherein a pair of discs are mounted in spaced allel relation for rotation by a motor about a common axis with a face of only one of the discs being exposed to a layer of fluid contacting a surface to be tested. A torsionally resilient coupling beteen the discs permits rotational displacement due to a difference in hydrodynamic drag thereon. The displacement is sensed as a phase difference between signals generated by rotation of the discs and a phase signal is applied to a function generator the output of which is displayed as a figure of merit of test surface condition.