US3853499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming progressive power lens blanks
Assignee: Individual
•
Filing: 1973-02-23
•
Granted: 1974-12-10
•
Expires: 1993-02-23
Abstract
Abstract The present disclosure is directed to a machine and method for grinding lens blanks of progressive power in which an annular abrasive grinding ring having its internal diameter radiused is mounted for pivotal movement relative to a static frame which supports a gear driven pivotally linked lens carrier which is connected to be rocked proportional to the relative movement between the ringing ring and static frame to provide a progressive power lens measured from its bottom to top or vice versa.
Inventors
- 👤 L Larson
- 👤 D Tindall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:49
CPC Classifications
B; B24; B24B; B24B13/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
A progressive power lens blank forming machine comprising: a. a static frame, b. a movable frame pivoted for movement relative to said static frame, c. lens grinding abrasive means mounted for rotation upon said movable frame, d. a first control means connected between said static and movable frame for regulating the amount of pivotal movement between said frames, e. lens holding means having a base, a pair of arms one end of each of which is pivoted to said base, one of said arms being a short arm and the other of said arms being a long arm, said long arm being connected at its upper end to be gear driven from said static support and a complemental gear in mesh therewith and connected to be rotated by said movable frame at a rate proportional to the rocking movement of said movable frame relative to said static frame to cause wiping of said lens holder across said lens grinding abrasive to grind a lens blank of progressive thickness f. a second control means connected between said movable frame and said lens holding means regulating the rate of movement of said lens holding means across said abrasive means as said movable frame is moved by said first control means relative to said static frame to cut a lens blank of progressive thickness from one extremity to the other.
Claim 2
Dependent Claim
227 words
A progressive power lens blank forming machine comprising: a. a static frame, b. a movable frame pivoted for movement relative to said static frame, c. lens grinding abrasive means mounted for rotation upon said movable frame, d. a first control means connected between said static and movable frame for regulating the amount of pivotal movement between said frames, e. lens holding means having a base, a pair of arms one end of each of which is pivoted to said base, one of said arms being a short arm and the other of said arms being a long arm, said long arm being connected at its upper end to be gear driven from said static support and a complemental gear in mesh therewith and connected to be rotated by said movable frame at a rate proportional to the rocking movement of said movable frame relative to said static frame to cause wiping of said lens holder across said lens grinding abrasive to grind a lens blank of progressive thickness f. a second control means connected between said movable frame and said lens holding means regulating the rate of movement of said lens holding means across said abrasive means as said movable frame is moved by said first control means relative to said static frame to cut a lens blank of progressive thickness from one extremity to the other.
Claim 3
Dependent Claim
26 words
A machine as claimed in claim 1 wherein said lens grinding abrasive is an annular abrasive ring having its internal diameter rounded on a true radius.
Claim 4
Dependent Claim
41 words
A machine as claimed in claim 2 wherein the movable frame is pivoted to the static frame at the plane of the center of the circle upon which the radius of the internal diameter of the annular abrasive ring is struck.
Claim 5
Dependent Claim
49 words
A machine as claimed in claim 1 wherein said first control means is a motor driven screw shaft mounted on said static frame and a complementally threaded follower secured to said movable frame for causing rocking movement of said movable frame about its pivotal connection to said static frame.
Claim 6
Dependent Claim
66 words
A machine as claimed in claim 1 wherein said second control means comprises a first gear drive pivoted to said static frame and connected to be rocked proportional to relative movement between said static and movable frames, a second gear in mesh with said first gear and connected to rock said lens holding means in its direction of movement toward and away from the abrasive means.
Claim 7
Dependent Claim
41 words
A machine as defined in claim 5 further comprising a template and guide means connected between said movable frame and said first gear drive means to vary the rate and angle of wipe of said lens carrier across said Abrasive means.
References Cited (Backward Citations)
US2885832A
Cited
US3012379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |