Static molds – Providing substitution of alternatively used parts
Patent
1973-08-20
1976-02-17
Lake, Roy
Static molds
Providing substitution of alternatively used parts
249160, 264 1, 264 26, 425808, B29D 1100
Patent
active
039387755
ABSTRACT:
A method of making mold assemblies in which are cast polymerized synthetic resin, single vision and multi-focal plastic ophthalmic lenses. Molds are used to produce optical surfaces on the cast resin lenses. These are of glass which is optically surfaced and then assembled within a resilient carrier and supported frictionally in sealed engagement with the tubular resilient walls of the mold assembly carrier. The carrier is designed to provide for positioning the mold elements dimensionally so as to control concentricity, thickness and prism of the finished casting with no portion of the body of the carrier interlying the glass mold elements. Unrestricted shrinkage therefore is allowed to take place in thickness so as to allow full curing of the lens without premature mold separation. The mold assembly is sealed to provide a hermetic closure against leakage of contents or intrusion of air into the mold assembly during curing.
REFERENCES:
patent: 1767163 (1930-06-01), Ackermann
patent: 2333051 (1943-10-01), Smith
patent: 3273204 (1966-09-01), Craddock
patent: 3555611 (1971-01-01), Reiterman
patent: 3605195 (1971-09-01), Campbell
patent: 3806079 (1974-04-01), Beattie
patent: 3836111 (1974-09-01), Binder
Abrams Neil
Lake Roy
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