Insert for molding convex surfaces of progressive lenses and ret

Details Insert for molding convex surfaces of progressive lenses and ret Insert for molding convex surfaces of progressive lenses and ret

1994-04-25

1995-08-15

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

Plural wear or shaping surfaces mounted for alternative use

425186, 425192R, 425195, 425808, 249102, B29C 3330, B29D 1100

Patent

active

054413982

ABSTRACT:
An insert for molding the convex surface of a progressive lens, the insert having an annular shoulder or flat disposed to the rear of the front edge of the concave surface of the insert. The periphery of the insert includes a first cylindrical surface axially extending rearwardly from the front surface of the insert and a second cylindrical surface of larger diameter axially extending forwardly from the rear surface of the insert. The two cylindrical surfaces are joined by the radially extending shoulder. A retainer for the insert is provided with two axially displaced bores of respective diameters slightly greater than those of the two cylindrical surfaces of the insert. Positioned between the bores is a radially extending annular shoulder or flat.

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patent: 5180595 (1993-01-01), Kinoshita
patent: 5188650 (1993-02-01), Nomura

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