Measuring and testing – Surface and cutting edge testing – Roughness
Patent
1987-08-10
1990-05-29
Levy, Stewart J.
Measuring and testing
Surface and cutting edge testing
Roughness
G01B 528
Patent
active
049285173
ABSTRACT:
An improved link arm assembly which couples a surface finish measuring instrument housing to an associated probe which is moved across a workpiece surface to evaluate surface finish characteristics. The link arm assembly enables a probe mounting arm to be rotated from an inoperative, generally vertical position to a rotated generally horizontal operating position in which the probe is positioned in contact with a workpiece surface. In accordance with the present invention, a clutching arrangement is provided which enables the probe mounting arm to be rotated freely from the operating to the normal position but which imposes fluid damping in the opposite direction of rotation which limits the angular velocity of the probe mounting arm and the impact forces which are imposed on the probe when it is being moved into contact with the workpiece. Accordingly, damaging high impact between the probe and workpiece is avoided.
REFERENCES:
patent: 2471009 (1949-05-01), Reason
patent: 3937903 (1976-02-01), Osann, Jr.
patent: 4415072 (1983-11-01), Shoji et al.
patent: 4462162 (1984-07-01), McMurtry
patent: 4549638 (1985-10-01), Johnston
patent: 4665739 (1987-05-01), Mizuno
Levy Stewart J.
Precision Devices Inc.
Raevis Robert R.
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