Patent ID: 6935033
Filing Date: 2005-08-30
Classification: G02C

Abstract:
1. Measuring instrument for establishing an angle by which each lens-mounting rim of a spectacles frame having two lens-mounting rims joined by a spectacles bridge is tilted in a horizontal plane, said instrument comprising: a flat supporting plate of a transparent material, having an upper surface on which said spectacles frame may be placed with upper or lower outside edges of said lens-mounting rims downward; a marking line on the upper surface of said supporting plate, along which the two lens-mounting rims and the spectacles bridge of said spectacles frame may be aligned; a bottom plate having a flat upper surface on which said supporting plate may be placed and positioned by sliding; said upper surface of said bottom plate bearing as markings: an elongate spectacles bridge mark having two ends and marking a position above which a spectacles bridge of the spectacles frame positioned on the upper supporting plate may be approximately disposed; a line of zero deviation extending outwards along from close to each end of the spectacles bridge mark for a length greater than a length of a lens-mounting rim of said spectacles frame, two fans of angles each originating close to one end of said spectacles-bridge mark and extending outwards in opposite directions for a length greater than that of a lens-mounting rim of said spectacles frame, each fan of angles including said line of zero deviation and covering a range of angles of deviation from said line of zero deviation, numerals indicating values of said angles of deviation, said marking line bearing a numeral indicating zero deviation.