Patent US3737238A successfully refreshed from Google Patents.
US3737238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for centering spectacle lenses
Assignee: Wernicke and Co GmbH
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Filing: 1971-11-19
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Granted: 1973-06-05
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Expires: 1991-11-19
Abstract
Abstract This invention is concerned with devices for centering spectacle lenses, in which the lens is located on a support or mount by means of a rubber cap or the like, so that by copying a template or pattern in a grinding machine the lens is given its desired peripheral shape, the de-centering of the lens vis-a-vis the central rotation point of the template or the mount is transmitted onto a reference plate with a graded scale at the edge and a center cross or other index mark.
Inventors
- 👤 J Reiner
- 👤 G Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:01
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; B24B13/0055
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
Apparatus for centering untrimmed spectacle lenses in relationship to a template in preparation for grinding the lens periphery to match the template size and shape comprising; optical means for observation of an untrimmed spectacle lens mounted on an adjustable support, said means including an eye lens; a partially reflecting mirror mounted between the spectacle lens and the eye lens, set at an angle for reflecting light fron another direction into the eye lens; a template having a desired shape and size to insure subsequent mounting in a mounting frame, said template mounted adjacent to said mirror so that light from the template is reflected from the mirror into the eye lens, thereby forming a virtual image superposed on that of the spectacle lens; and adjusting means for moving the template toward or away from the mirror to eliminate parallax.
Claim 2
Dependent Claim
139 words
Apparatus for centering untrimmed spectacle lenses in relationship to a template in preparation for grinding the lens periphery to match the template size and shape comprising; optical means for observation of an untrimmed spectacle lens mounted on an adjustable support, said means including an eye lens; a partially reflecting mirror mounted between the spectacle lens and the eye lens, set at an angle for reflecting light fron another direction into the eye lens; a template having a desired shape and size to insure subsequent mounting in a mounting frame, said template mounted adjacent to said mirror so that light from the template is reflected from the mirror into the eye lens, thereby forming a virtual image superposed on that of the spectacle lens; and adjusting means for moving the template toward or away from the mirror to eliminate parallax.
Claim 3
Dependent Claim
36 words
Apparatus according to claim 1 wherein a transparent reference plate is mounted adjacent to the template substantially parallel thereto and between the template and said mirror, said reference plate formed with a symbol designating its center.
Claim 4
Dependent Claim
32 words
Apparatus according to claim 2 wherein the reference plate is adjustable in its own plane to move the virtual image of its center symbol relative to the center of the spectacle lens.
Claim 5
Dependent Claim
36 words
Apparatus according to claim 1 wherein said partially reflecting mirror is positioned at an angle of 45* with the line of sight between the center of the eye lens and the center of the spectacle lens.
Claim 6
Dependent Claim
26 words
Apparatus according to claim 1 wherein a source of illumination is positioned above the partially reflecting mirror for illuminating both the spectacle lens and the template.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |