Static molds – Container-type molding device – Including means securing molding device to detachable,...
Patent
1990-03-26
1991-12-10
Housel, James C.
Static molds
Container-type molding device
Including means securing molding device to detachable,...
51216LP, 51217L, 249 61, 264 27, 279 16, 409903, 425808, B29D 1100
Patent
active
050711016
ABSTRACT:
A casting mold for use in the manufacture of intraocular/contact lenses. The casting mold comprises a base and a cup-like feature attached to the base. The base has a frusto-conical configuration defined by a first planar circular cross-sectional area taken adjacent to the cup-like feature and a second planar circular cross-sectional area taken at a distance remote from the cup-like feature. The circumferences of the first and second cross-sectional areas respectively form lips. The first cross-sectional area is substantially less than the second cross-sectional area, and the portion of the base defining its side walls extends between the respective lips of the first and second cross-sectional areas and lies substantially within the generatrix of a line connecting the respective lips of the first and second cross-sectional areas rotated about the axis connecting the centers of the first and second cross-sectional areas. A segment of the base along a chord cutting the circumference of the base has been removed. The defined configuration of the casting mold facilitates location of the mold in a collet of a lens generating lathe.
REFERENCES:
patent: 3258879 (1966-07-01), Edelstein
patent: 3330331 (1967-07-01), Duckwall et al.
patent: 4517140 (1985-05-01), Rawlings
patent: 4686798 (1987-08-01), Petty et al.
patent: 4749530 (1988-06-01), Kunzler
patent: 4924739 (1990-05-01), Ademovic
Housel James C.
Kessler Lawrence P.
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