Geometrical instruments – Gauge – Screw thread
Patent
1984-01-06
1985-11-19
Little, Willis
Geometrical instruments
Gauge
Screw thread
33147M, G01B 340
Patent
active
045533377
ABSTRACT:
A thread gauge which attaches to a vernier caliper to measure the thread pitch diameter of both externally threaded and internally threaded parts. A pair of anvils are externally threaded with threads having the same pitch as those of the threaded part. Each anvil is mounted on a stem having a ball on which the anvil can rotate to properly mate with the parts to which the anvils are applied. The stems are detachably secured to the caliper blades by attachment collars having keyhole openings for receiving the stems and caliper blades. A set screw is used to secure each collar on its caliper blade.
REFERENCES:
patent: 2941304 (1960-06-01), Man
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