Geometrical instruments – Gauge – Screw thread
Patent
1994-02-01
1996-02-13
Wirthlin, Alvin
Geometrical instruments
Gauge
Screw thread
335011, 335552, 33DIG11, G01B 348
Patent
active
054903335
ABSTRACT:
A device to measure round objects, especially threaded objects is shown where three cam surfaces located on the interior of an annular ring are contacted by rollers which are advanced or retracted as a cam surface is traversed. The traverse of the cam surface allows change in diameter formed by the rollers and by locking the cam position, a fixed gauge is formed. The rollers directly contact the part to be measured. As applied to thread measurement, the three point gauge uses annular rollers to measure properties of thread fit and use when the rollers have the threads slightly offset from each other to make a pitch test set. The device allows a single gauge to handle at least 12 normal go and no-go gauging functions with just change of rollers for various fit and pitch classes. The gauge also is settable at special sizes near a standard size due to a range of adjustment.
REFERENCES:
patent: 1908253 (1933-05-01), Johnson
patent: 2218111 (1940-10-01), Johnson
patent: 2249954 (1941-07-01), Hellberg et al.
patent: 2355007 (1944-08-01), Mitchell
patent: 3388476 (1968-06-01), Johnson
patent: 4965936 (1990-10-01), Sentman
LeBlanc John
Nelson Russell
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