Geometrical instruments – Gauge – Screw thread
Patent
1989-02-10
1990-08-14
Will, Thomas B.
Geometrical instruments
Gauge
Screw thread
33829, G01B 340
Patent
active
049475550
ABSTRACT:
A pitch diameter gauge is disclosed which includes a gauge body and a first arm attached to the body and extending perpendicular outward therefrom. A second arm is attached to the body and extends perpendicular outward therefrom along the same side as the first arm and the second arm is spaced from and substantially parallel to the first arm. One of the arms is adjustable along the body and is lockable to the body in a desired location. A single ball contact is connected to one of the arms in a manner which permits movement thereof with respect to the other of the arms along a line perpendicular to both arms. The gauge also includes a base pivotally mounted near an end of the other of the arms and has a pair of spaced ball contacts mounted thereto along the surface opposite the associated arm. The single ball contact and pair of ball contacts are oriented either both toward or both away from each other. The pair of ball contacts is positioned along a line parallel to a longitudinal axis of the associated arm and the base is pivotable about an axis perpendicular to a plane parallel to the first and second arms. The pivot axis of the base is located in a line extending perpendicular to the first and second arms through the single ball contact and passes between the pair of ball contacts. Finally, the gauge includes an indicator mounted thereto and a moveable mechanism connecting the single ball contact to the indicator, whereby movement of the single ball contact is detected by the indicator.
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Allen Gauge & Tool Company brochure-Catalog 85 (Date Unknown).
Allen Gauge & Tool Company
Will Thomas B.
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