Geometrical instruments – Scriber – Curved line
Patent
1977-01-03
1978-07-04
Aegerter, Richard E.
Geometrical instruments
Scriber
Curved line
33113, 33120, B43L 700
Patent
active
040979997
ABSTRACT:
A device capable of gauging angles in the full range from 0.degree. to 360.degree.. The angle gauge has a pair of pivotally connected gauging arms. Each gauging arm is formed by a generally radially outwardly extending leg connected at one end to the pivot axis and a radially offset straight edge leg extending generally laterally from the opposite end of the radial leg. A full 360.degree. angle scale is fixed relative to one of the gauging arms coaxially with the pivot axis and extends radially outwardly a distance less than the offset of the straight edge. A pointer is fixed relative to the other gauging arm as a reading indicator operably associated with the scale. The arms may be clamped in selected angular positions and also may be used to lay out several angles about a common vertex.
One of the gauging arms has a pitch scale formed along it and the other arm has an indicator mark formed on it. The intersection of the pitch scale with the edge of the arm not having the pitch scale occurs at the tangent of the angle on the angle scale which is in registration with the indicator mark.
REFERENCES:
patent: 761272 (1904-05-01), Wagniere et al.
patent: 1128673 (1915-02-01), Foner
patent: 1975648 (1934-10-01), Poulsen
patent: 2023539 (1935-12-01), Packard
patent: 2735185 (1956-02-01), Naphtal
patent: 3173214 (1965-03-01), Daller
Aegerter Richard E.
Foster Frank H.
Shepperd John W.
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