Geometrical instruments – Area integrators – Electrical
Patent
1984-08-03
1985-10-22
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
33199R, G01B 318, G01B 512
Patent
active
045479704
ABSTRACT:
A thread gauge which attaches to an inside micrometer to measure the thread pitch diameter of internally threaded parts. A pair of anvils have external threads which match in pitch with the threads of the part. Each anvil has a bore which receives a ball and a slot which receives a stem projecting from the ball. Mounting sleeves connect the stems with the opposite ends of the micrometer. Each anvil can rotate on its ball about the stem axis so that the micrometer can be adjusted to position the anvils against the threaded part. The anvils can also move linearly on the balls to properly align with the threads of the part.
REFERENCES:
patent: 1797122 (1931-03-01), Bohn
patent: 2249611 (1941-07-01), Johnson
patent: 2410571 (1946-11-01), Easton et al.
patent: 2556580 (1951-06-01), Fox et al.
patent: 2937452 (1960-05-01), Man
patent: 3111766 (1963-11-01), Bryant
patent: 4453316 (1984-06-01), Marveggio
Rowell, "Using a Ball-Pointed Mike for Internal Thread Measurement", American Machinist, Jul. 1931, p. 179.
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