Geometrical instruments – Gauge – Taper
Patent
1987-11-30
1988-10-18
Haroian, Harry N.
Geometrical instruments
Gauge
Taper
33168R, G01B 524
Patent
active
047777311
ABSTRACT:
The measuring bar consists of an elongated rigid sectional shaft to the ends of which are secured two identical diametrically larger spherical bodies. Adjacent and inwardly of each body, there is provided a pair of stabilizer discs eccentrically connected to the shaft about a transverse axis. These stabilizer discs impart lateral stability to the measuring bar when both spherical bodies rest on a curved or flat surface. The spherical bodies are of precisely-known diameter d and the distance L.sub.a between their centers is also precisely known. The method of measuring, for instance, the taper of a conical shaft includes the following steps: (a) positioning the measuring bar on the shaft with its longitudinal axis co-planar with the shaft axis; (b) measuring at a first spherical body the shortest distance S.sub.a between a point of the shaft opposite the body and co-planar with the axes of the measuring bar and of the shaft and a tangent of the first body whereby the latter distance is measured along a line which is normal to the cone generatrix containing this point; (c) repeating the measuring step (b) at the second body to obtain the distance Sb; and (d) computing the tapering angle .theta. from L.sub.a, S.sub.a and S.sub.b by resolving the following equation: ##EQU1##
REFERENCES:
patent: 1179551 (1916-04-01), Muller
patent: 1225315 (1917-05-01), Conrad
patent: 2494715 (1950-01-01), Mathews
patent: 2635346 (1953-04-01), Muench
patent: 2645026 (1953-07-01), Trbojevich
patent: 4389785 (1983-06-01), Goldsmith et al.
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