Static molds – Including static filling means in contact with mold cavity
Patent
1977-01-27
1978-09-12
Flint, Jr., J. Howard
Static molds
Including static filling means in contact with mold cavity
249117, 249 53R, 425808, 425410, 264 1, B29C 500, B29D 1100
Patent
active
041132246
ABSTRACT:
Apparatus for and method of forming ophthalmic lenses and/or semi-finished lens blanks including those of the eye contact type. The apparatus includes molds having cooperating first and second members each of which includes a longitudinal axis and a mold surface which is symmetrical with respect to such axis. In one embodiment these mold members or halves also include cooperating surfaces which, in operation and in cooperation with the selected lens material, both align the respective mold axes and axially position the mold surface of the first member with respect to the mold surface of the second member to thereby form the desired lens mold cavity. Further, each of the assembled molds also includes an annular reservoir which surrounds the mold cavity and is defined by surfaces provided on the first and second mold members. This reservoir is connected to the mold cavity via an annular restriction. In one embodiment this restriction is defined by the cooperating aligning surfaces provided on the first and second mold members.
In operation, the reservoir holds a volume of lens material which, during the polymer forming reaction, is kept in a flowable state longer than the lens material in the mold cavity. This arrangement permits the transfer of lens material between the reservoir and the mold cavity during curing. Apparatus is also provided for removing selected portions of the cast lens in those instances where removal is either necessary or expedient.
REFERENCES:
patent: 2266169 (1941-12-01), Crumrine
patent: 2424235 (1947-07-01), Hoffer
patent: 3304586 (1967-02-01), Buckminster et al.
patent: 3902693 (1975-09-01), Crandon et al.
Clark James A.
Livesey Donald V.
Wrue Richard J.
Bausch & Lomb Incorporated
Flint, Jr. J. Howard
Morgan DeWitt M.
Parker Frank C.
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