Geometrical instruments – Gauge – Spectacle
Patent
1980-06-16
1982-01-12
Stearns, Richard R.
Geometrical instruments
Gauge
Spectacle
33174A, 351 5, 356393, A61B 310, G01B 908
Patent
active
043098266
ABSTRACT:
Apparatus for determining the diameter of corrective lenses adaptable to spectacle frames. The apparatus comprises at least a stand or structure provided with (a) a symmetrical linear measuring scale, (b) guiding means parallel to the said measuring scale, and (c) an underlying surface, a resting support and centering means all cooperating to hold a spectacle frame in a predetermined position. The apparatus further comprises at least one carriage sliding on the said guiding means and comprising a first part provided with a planar receiving surface adapted to receive removable plates provided with reference marks and lines representing at least the outline of one or more types of uncut corrective lenses, and a second part equipped with a semi-reflecting mirror placed in the bisecting plane of the dihedron angle defined by the said receiving surface and the said reference plane.
REFERENCES:
patent: 3586448 (1971-06-01), Beasse
patent: 3804528 (1974-04-01), Kilmer et al.
patent: 4098002 (1978-07-01), Campbell et al.
patent: 4099881 (1978-07-01), Vanden Broek et al.
patent: 4196978 (1980-04-01), Johnson
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