Geometrical instruments – Area integrators – Electrical
Patent
1983-04-18
1985-09-10
Little, Willis
Geometrical instruments
Area integrators
Electrical
33180R, 33185R, G01B 525
Patent
active
045397538
ABSTRACT:
An inspection tool for determining the location of a hole in a surface, having: a shaft sized for insertion in the hole and holding the tool in fixed relative relation thereto during tool usage, the shaft having a longitudinal axis in alignment with the center line of the hole when inserted therein; a first member having a substantially spherical surface portion, the first member being attached to the shaft, with the center point of the spherical portion of the first member aligned along the shaft axis; and a second member having a substantially spherical surface portion, the second member being attached to the first member remote from the shaft, with the center point of the spherical portion of the second member aligned along the shaft axis, the spherical portion of the second member having a smaller radius of curvature than the spherical portion of the first member; and a collar attached to the shaft between the shaft and the first member, the collar having an engagement surface extending radially outward from the shaft axis for engaging the surface in which the hole is located and holding the first and second members at predetermined distances above the surface. The spherical portions of the first and second members are made optically discernible, such as by use of contrasting colors. In an alternative disclosed embodiment, the spherical portions of the first and second members have substantially equal radii of curvature, and the second member is removably attached to the first member. The second member has a concave portion facing toward the first member for nesting of a portion of the first member therein.
REFERENCES:
patent: 1157389 (1915-10-01), Hess
patent: 2556067 (1957-06-01), Coffer, Jr.
patent: 2657470 (1953-11-01), Allen et al.
patent: 3518769 (1970-07-01), Bullard et al.
patent: 4320580 (1982-03-01), Williams
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