US3865178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for casting a holding block on an ophthalmic lens
Assignee: EssilorLuxottica SA
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Filing: 1973-05-21
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Granted: 1975-02-11
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Expires: 1993-05-21
Abstract
Abstract The ophthalmic lens blank finished on one face is covered with a mounting member of which the wall covering the finished face of the blank is shaped to act as a bearing means for positioning the lower contour of the mould of the holding-block casting device and permitting the penetration, between said finished face of the blank and the mounting member, of the low-melting alloy cast by the holding-block casting device. After the casting operation, the mounting member remains incorporated in the block-supported blank except for a centering strip surrounding the cylindrical edge of the blank, said strip being removed by pulling a gripping member and tearing circumferentially a circular bridge portion of moderate thickness, before fitting the block-supported blank on the machine for surfacing, grinding or shaping the unfinished face of the blank.
Inventors
- 👤 Serge Legendre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:35
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; B24B13/0052
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
Mounting member for use in casting a holding block on an ophthalmic lens blank finished on one face only, and adapted for fitting to the blank through centering means, means for fixing the mounting member on said blank in the angular direction, and means for engaging the finished face of said blank, said mounting member having a substantially annular configuration with an annular portion adapted to engage the finished face of the blank, said centering means comprising a cylindrical skirt forming a downward extension of said annular portion and adapted to engaGe with a slightly clamping force the outer cylindrical edge of the blank, and said means for fixing the blank in the proper angular direction comprising a projection carried by said skirt and engageable in a matching notch formed in the edge of said blank.
Claim 2
Dependent Claim
136 words
Mounting member for use in casting a holding block on an ophthalmic lens blank finished on one face only, and adapted for fitting to the blank through centering means, means for fixing the mounting member on said blank in the angular direction, and means for engaging the finished face of said blank, said mounting member having a substantially annular configuration with an annular portion adapted to engage the finished face of the blank, said centering means comprising a cylindrical skirt forming a downward extension of said annular portion and adapted to engaGe with a slightly clamping force the outer cylindrical edge of the blank, and said means for fixing the blank in the proper angular direction comprising a projection carried by said skirt and engageable in a matching notch formed in the edge of said blank.
Claim 3
Dependent Claim
31 words
Mounting member according to claim 1, wherein said means for engaging the finished face of said blank comprises at least one bearing element projecting from the underside of said annular portion.
Claim 4
Dependent Claim
35 words
Mounting member according to claim 2, wherein the upper surface of said annular portion is shaped to constitute a spherical seat adapted to be engaged by a corresponding clamping surface of a block casting mold.
Claim 5
Dependent Claim
35 words
Mounting member according to claim 2, wherein the upper surface of said annular portion is shaped to constitute a tapered seat adapted to be engaged by a corresponding clamping surface of a block casting mold.
Claim 6
Dependent Claim
14 words
Mounting member according to claim 2, wherein said member is made of plastic material.
Claim 7
Dependent Claim
15 words
Mounting member according to claim 5, wherein said plastic material is a transparent plastic material.
Claim 8
Dependent Claim
34 words
Mounting member according to claim 6, wherein for positioning said member in proper angular relationship in a block casting mold it comprises a circular graduated scale visible on said annular portion through said blank.
Claim 9
Dependent Claim
52 words
Mounting member according to claim 7, wherein the skirt is connected to said annular portion through a thin bridge portion and has formed therein a transverse starting of tear having a gripping lug extension adapted, when pulled by an operator after completing the casting operation, to strip the edge of the blank.
Claim 10
Dependent Claim
26 words
Mounting member according to claim 8, wherein said member is adapted to act as a packing for protecting an ophthalmic lens blank finished on one face.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |