Geometrical instruments – Gauge – Screw thread
Patent
1988-09-23
1990-10-30
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
Screw thread
335551, 33794, 33827, 33829, G01B 348
Patent
active
049659367
ABSTRACT:
A thread pitch cylinder gage for an internally threaded bore in a workpiece, according to one embodiment, includes a gage post having a bearing surface extending through an externally threaded sleeve. The sleeve is trapped on the bearing surface by a retaining cap at the end of the gage post. A finger on the bearing surface engages a notch in the sleeve to prevent rotation of the sleeve relative to the bearing surface, while permitting relative axial motion. The sleeve includes two collections of retaining cavities with balls trapped therein, one at each end of the sleeve. The cavities, and therefore the balls, are centered between the flanks of a thread on the sleeve, and the balls are radially slidable between a retracted and a locked position. The bearing surface includes a plurality of sloped cam surfaces radially aligned with the balls in the sleeve. The cam surfaces are adapted to urge the balls radially outward when the gage post is pulled axially relative to the sleeve, until the balls contact, and are locked against, the threads in the workpiece bore. The two collections of balls, when in the locked position, establish the pitch cylinder and pitch axis of the threaded bore.
REFERENCES:
patent: 890394 (1908-06-01), Ahrens
patent: 2249954 (1941-07-01), Hellberg et al.
patent: 2434535 (1948-01-01), Anders
patent: 2595917 (1951-05-01), Bath et al.
patent: 2782521 (1957-02-01), Parker et al.
patent: 2841877 (1958-07-01), Coley
patent: 3516166 (1970-06-01), Moore
patent: 3827154 (1974-08-01), Kaifesh
patent: 4480388 (1984-11-01), O'Brien
patent: 4590678 (1986-05-01), Arredondo
Cuchlinski Jr. William A.
Wirthlin Alvin
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