Gasket and mold assembly for producing plastic lenses
First Claim
Patent Images
1. A gasket configured to engage a first mold set for forming a first lens of a first power, the first mold set defining a mold cavity for receiving a lens forming composition, the gasket comprising at least four discrete projections for spacing mold members of the first mold set, wherein the projections are arranged on an interior surface of the gasket;
- wherein the projections form an oblique angle with a steep axis and a flat axis of a mold member of the first mold set; and
wherein the gasket further comprises a fifth projection positioned such that the fifth projection contacts a mold member of the first mold set, and wherein the fifth projection extends into the mold cavity when the gasket engages the first mold set.
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Accused Products
Abstract
An annular gasket may be configured to engage a mold set for forming a mold assembly. The gasket includes at least four discrete projections. The projections are preferably arranged upon inner surface such that they are substantially coplanar. The projections may be evenly spaced around the interior surface of the gasket.
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Citations
24 Claims
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1. A gasket configured to engage a first mold set for forming a first lens of a first power, the first mold set defining a mold cavity for receiving a lens forming composition, the gasket comprising at least four discrete projections for spacing mold members of the first mold set, wherein the projections are arranged on an interior surface of the gasket;
- wherein the projections form an oblique angle with a steep axis and a flat axis of a mold member of the first mold set; and
wherein the gasket further comprises a fifth projection positioned such that the fifth projection contacts a mold member of the first mold set, and wherein the fifth projection extends into the mold cavity when the gasket engages the first mold set. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- wherein the projections form an oblique angle with a steep axis and a flat axis of a mold member of the first mold set; and
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8. An assembly for making plastic prescription lenses, comprising:
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a first mold set for forming a first lens of a first power, the first mold set comprising a first mold member and a second mold member;
a gasket for engaging the first mold set, the gasket comprising at least four discrete projections for spacing the front mold member from the back mold member and a fifth projection positioned such that the fifth projection contacts a mold member of the first mold set, wherein the fifth projection extends into the mold cavity when the gasket engages the first mold set;
wherein the second mold member comprises a steep axis and a flat axis, and wherein each of the at least four discrete projections forms an oblique angle with the steep axis and the flat axis of the second mold member; and
wherein the first mold member, the second mold member, and the gasket at least partially define a mold cavity for retaining a lens forming composition. - View Dependent Claims (9, 10, 11, 12)
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13. A gasket configured to engage a first mold set for forming a first lens of a first power, the gasket comprising four discrete projections for spacing mold members of a mold set, wherein the projections form an oblique angle with a steep axis and a flat axis of a mold member of the first mold set;
- and wherein the projections are arranged on an interior surface of the gasket and further comprising a fifth projection positioned such that the fifth projection contacts a mold member of the first mold set, wherein the fifth projection forms a groove in the lens during use; and
wherein the groove facilitates separation of the mold set. - View Dependent Claims (14, 15, 16, 17, 18, 19)
- and wherein the projections are arranged on an interior surface of the gasket and further comprising a fifth projection positioned such that the fifth projection contacts a mold member of the first mold set, wherein the fifth projection forms a groove in the lens during use; and
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20. An assembly for making plastic prescription lenses, comprising:
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a first mold set for forming a first lens of a first power, the first mold set comprising a first mold member and a second mold member;
a gasket for engaging the first mold set, the gasket comprising four discrete projections for spacing the front mold member from the back mold member and further comprising a fifth projection positioned such that the fifth projection contacts a mold member of the first mold set, wherein the fifth projection forms a groove in the lens during use, and wherein the groove facilitates separation of the mold assembly during use;
wherein the second mold member comprises a steep axis and a flat axis, and wherein each of the at least four discrete projections forms an oblique angle with the steep axis and the flat axis of the second mold member; and
wherein the first mold member, the second mold member, and the gasket at least partially define a mold cavity for retaining a lens forming composition. - View Dependent Claims (21, 22, 23, 24)
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Specification