Geometrical instruments – Area integrators – Electrical
Patent
1982-09-15
1984-11-20
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
33178R, G01B 512
Patent
active
044830785
ABSTRACT:
A simple and inexpensive apparatus for rapidly measuring the inside diameter of a bore includes an elongated cylindrical tube which has a first pair of diametrically opposed tapered slots formed in one end thereof. A second pair of diametrically opposed slots of uniform width are formed in the other end of the tube, oriented perpendicularly to the first pair of tapered slots. A linear translation indicating device such as a dial indicator is provided to measure the distance between the opposing sides of the one end of the tube. A pair of extension arms are secured to the other end of the tube. By pressing the opposing sides of the one end of the tube together, the opposing sides of the other end of the tube will move inwardly such that the bore gauge and particularly the extension arms can be inserted into a bore to be measured. When released, the opposing sides of both ends of the tube will expand outwardly until the outer faces of the extension arms contact the inside wall of the bore to be measured. When calibrated to the known diameter of a master ring, the dial indicator will indicate the deviation from the diameter of the master ring.
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patent: 3995374 (1976-12-01), Fisk
patent: 4397092 (1983-08-01), Marcyan
Cooper Industries Inc.
Martin, Jr. William D.
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