US Patent: 4,326,338 - Area Comparison Gage


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US Patent: 4,326,338

Area Comparison Gage

Patentee:

Robert A. Plante (exact or similar names) - Erving, Franklin County, MA

USPTO Classifications:

33/121, 33/560, 33/DIG.2

Tool Categories:

metalworking tools : machinist tools : measuring tools : limit gages

Assignees:

L. S. Starrett Co. - Athol, Worcester County, MA

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Sep. 10, 1980
Granted:	Apr. 27, 1982

Patent Pictures:

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"Vintage Machinery" entry for L. S. Starrett Co.
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The Starrett Story
History of the L. S. Starrett Co.

Description:

Note: This patent lists the patentee's location as Irving, MA. Earlier patents for this patentee lists it as Erving, MA.

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.