Geometrical instruments – Gauge – Center – point – distance between centers – or centerline location
Patent
1987-06-08
1988-09-27
Martin, Jr., William D.
Geometrical instruments
Gauge
Center, point, distance between centers, or centerline location
33234, 33286, 33533, 33644, 356153, G01C 2100
Patent
active
047731648
ABSTRACT:
A caliber bar for locating the centerline of the bore at the muzzle of a gun including a frame, first and second trunnion housings axially mounted on the frame, each of the trunnion housings pivotally mounting three centering arms circumferentially spaced at 120.degree. from each other for contacting the side of a bore at axially spaced locations, and first and second liquid springs mounted on the first and second trunnion housings, respectively, for biasing the centering arms associated with each trunnion housing simultaneously outwardly equal amounts into engagement with the side of the bore, and detents for removably holding the first and second trunnion housings in the frame.
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Frost John J.
Lee David A.
Taylor Douglas P.
Gastel Joseph P.
Martin, Jr. William D.
Tayco Developments, Inc.
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