Area comparison gage

Details Area comparison gage Area comparison gage

1980-09-10

1982-04-27

Little, Willis

Geometrical instruments

Area integrators

Electrical

33143R, 33174E, 33174L, 33DIG2, G01B 728

Patent

active

043263380

ABSTRACT:
A gage for directly measuring the deviation in cross sectional area of a passage from a nominal value employs a hydraulic system having pistons operatively engaged therewith. The pistons move in response to movement of passage contacting finger elements and the hydraulic system responds to piston movement to generate a measure of the passage area. At least one set of the finger elements has rotatable passage contacting members, each member having an elongated passage contacting surface. Each member rotates about a respective axis positioned to keep the center of each contact surface in a fixed position relative to the finger. Stop means are provided by fixed outboard finger elements, juxtaposed opposite movable finger elements, for providing improved stability for positioning the comparison gage.

REFERENCES:
patent: 2691827 (1954-10-01), Aller
patent: 4024646 (1977-05-01), Griggs
patent: 4112355 (1978-09-01), Gibson, Jr. et al.
patent: 4139947 (1979-02-01), Possati

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