Geometrical instruments – Gauge – Target – weapon – or weapon projectile
Patent
1992-09-14
1994-04-12
Tudor, Harold J.
Geometrical instruments
Gauge
Target, weapon, or weapon projectile
33551, 335553, 86 11, G01B 100
Patent
active
053014367
ABSTRACT:
A fixture for measuring runout in firearm cartridges, casings and bullets is provided. The fixture holds the cartridge at the tip and forward of the rim for rotation. A self centering tip bearing holds the tip of the cartridge, casing or bullet for rotation about an axis of rotation. The exterior surface of the cartridge, casing or bullet is supported in a V-shaped knife edge bearing. The distance from the knife edge bearing to the tip bearing is adjustable to accommodate various cartridge sizes. Interchangeable tip bearing tools are provided for rotatably holding bullets and casings, and for locating areas of variation in the thickness of the casing wall. The thickness indicating tool has a flat surface offset from the cartridge axis, which rests against the curved interior surface of a casing, forming a chord which supports the interior surface at two points. The gauge arm, placed on the outside of the casing between the two points, can then measure the relative thickness of the casing wall.
REFERENCES:
patent: 1364534 (1921-01-01), Walter
patent: 3398456 (1968-08-01), Cooper
patent: 4285132 (1981-08-01), Kloster
patent: 4637144 (1987-01-01), Schemel
patent: 4674193 (1987-06-01), Wertepny et al.
patent: 4679330 (1987-07-01), Williams
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Tudor Harold J.
Wittenberg Malcolm B.
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