Geometrical instruments – Area integrators – Electrical
Patent
1978-10-10
1980-05-06
Little, Willis
Geometrical instruments
Area integrators
Electrical
33149R, 33174Q, G01B 342, G01B 346, G01B 508
Patent
active
042009871
ABSTRACT:
A gauge for determining whether a hole is within tolerances is disclosed. Such gauge includes a cylindrical portion proportioned to fit within a hole with a relatively close fit. A paddle is pivotally mounted within the cylindrical portion for rotation in opposite directions from a neutral position. The paddle is formed so that when it is in the neutral position it has end faces which are aligned with the cylindrical portion of the gauge and which fit into the hole with a relatively close fit. One diagonal dimension of the paddle is equal to the minimum diameter of an in-tolerance hole and the other diagonal is equal to the maximum diameter of an in-tolerance hole. Once the gauge is positioned within the hole the paddle is tipped one way to determine if the hole has a diameter at least equal to the minimum diameter of an in-tolerance hole and the other way to determine if the hole has a diameter less than the maximum in-tolerance diameter. The gauge is manufactured by assembling the paddle within the cylindrical portion and grinding the paddle ends and the cylindrical portion to a predetermined diameter smaller than the diameter of the hole to be measured while holding the paddle in a predetermined angular relationship to a plane perpendicular to the axis of the cylindrical portion.
REFERENCES:
patent: 1810710 (1931-06-01), Johansson
patent: 1845359 (1932-02-01), Stein
patent: 2134262 (1938-10-01), Phillips
patent: 2377679 (1945-06-01), Eckstein
patent: 2472139 (1949-06-01), Aldeborgh et al.
patent: 2546154 (1951-03-01), Gardner
patent: 2577262 (1951-12-01), Mueller et al.
patent: 2714256 (1955-08-01), Watson
patent: 2733516 (1956-02-01), Tornebohm
patent: 3100349 (1963-08-01), Stresau
patent: 3267580 (1966-08-01), Hohwart et al.
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