Tool and method for forming a lens

Details Tool and method for forming a lens Tool and method for forming a lens

1990-10-29

1992-08-25

Swann, J. J.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51129, 51209R, B24B 4100

Patent

active

051407825

ABSTRACT:
Lens for eye glasses are formed by a method in which a lens is selected having a finished front face and a rear face to be finished to provide a required curvature. The rear face is firstly cut on a Generator machine and is then polished on a cylinder machine. In the invention the conventional metal tool of the cylinder machine is replaced by a tool formed from a plastics material. The tool is mounted on a tool holder by a cooperating shape of the tool holder and a contact surface of the tool including wedge-shaped members and side shoulders which locate the tool without the necessity for a clamping action. The tool is formed by selection of a tool having a curvature approximating to the required curvature following which the approximate tool is cut on the Generator machine to form the required curvature.

REFERENCES:
patent: 908677 (1909-01-01), Jones
patent: 1737159 (1929-11-01), Johannessen
patent: 4148160 (1979-04-01), Prunier
patent: 4165584 (1979-08-01), Scherrer
patent: 4229911 (1980-10-01), Bicskei
patent: 4274232 (1981-06-01), Wylde
patent: 4739589 (1988-04-01), Brehm et al.

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