Geometrical instruments – Gauge – Collocating
Patent
1992-06-29
1993-02-23
Will, Thomas B.
Geometrical instruments
Gauge
Collocating
33465, 33471, 33538, B27G 2300
Patent
active
051878771
ABSTRACT:
An adjustable angle instrument for high precision craftsmanship is configured from a pair of similar metal sector parts, each having a sector shape with a wide double flange along a straight edge. The two sector parts are accurately pivoted together in an apex region. Each flange is made to have accurate surfaces on its outer surfaces on which the instrument may be stood in a vertical position or laid horizontally on a flat surface such as a saw table. The flanges may be set to any angle between 45 and 90 degrees as indicated by a calibratable hairline cursor, and the angle may be captured by locking the two sector parts together by tightening a knurled brass knob. One of the sector parts is also provided with an edge which is accurately machined at 90 degrees relative to the flange and thus may be set to any angle between 0 to 45 degrees relative to the other flange, providing the instrument with a total range of 0 to 90 degrees. The scale, made as separate part and attached to one of the sector parts, extends along an arc of about seven inches at a nine inch radius and is machine marked to provide 0-45 and 45-90 degree ranges with accuracy better than .+-.0.05 degrees. The instrument may be used to set up various types of power saws and other machinery, to act as a workpiece guide and to mark angles on workpieces. It is also useful as a drafting aid and as a highly accurate instrument for general measurement of angles. Each of the instruments's two flanges is provided with four mounting holes which may be utilized for adding extensions in either width or length.
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Fay Lawrence W.
Jory John
McTaggart J. E.
Will Thomas B.
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