Pair of vernier calipers having a protractor

Details Pair of vernier calipers having a protractor Pair of vernier calipers having a protractor

1990-11-07

1991-10-15

Shoap, Allan N.

Geometrical instruments

Distance measuring

Opposed contacts

33532, 33783, G01B 356

Patent

active

050562380

ABSTRACT:
A pair of vernier calipers includes a shaft. A vernier is slidable along the shaft. A protractor has a base coupled to the vernier. A follower is pivotally coupled on the base. A spring is biased between the follower and the base so as to bias the follower to rotate in one direction relative to the base. A graduation is provided on the follower. A mark is provided on the base. When the vernier is pushed toward an object, the follower is caused to rotate so that a relative movement between the mark and the graduation indicates an angular dimension of the object.

REFERENCES:
patent: 79032 (1868-06-01), Tierney
patent: 129349 (1872-07-01), Kellogg
patent: 501807 (1893-07-01), Peterson
patent: 735935 (1903-08-01), Bellings
patent: 1039901 (1912-10-01), Constantinesco

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