US3685210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for lens generation
Assignee: Individual
•
Filing: 1970-09-09
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Granted: 1972-08-22
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Expires: 1990-09-09
Abstract
Abstract Apparatus for generating lenses is intended to overcome the problem of the lens breaking as the cutter tool is traversed across the lens. Drive means for moving the lens towards and away from the cutter tool during a cutting operation, is controlled so that, during the initial traverse of the cutter tool, the lens is backed off from the cutter. Before the return traverse the lens is moved back towards the cutter tool so that the tool removes the remaining thickness from the lens. The drive means takes the form of a double-acting piston and cylinder device including two pistons.
Inventors
- 👤 Gilbert John Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:44
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/04; B24B13/043
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
Apparatus for lens generation comprising, a lens holder, a cutter tool holder, fluid-operated drive means for moving the lens holder towards and away from the cutter tool holder, and control means for controlling the operation of the drive means during generation of a lens, so that the lens holder is backedoff from the cutting tool holder towards the end of a first cutting traverse of the cutting tool holder and the lens holder is moved towards the cutting tool holder prior to a return cutting traverse of the cutting tool holder, thereby obviating fracture of the edge of the lens.
Claim 2
Dependent Claim
100 words
Apparatus for lens generation comprising, a lens holder, a cutter tool holder, fluid-operated drive means for moving the lens holder towards and away from the cutter tool holder, and control means for controlling the operation of the drive means during generation of a lens, so that the lens holder is backedoff from the cutting tool holder towards the end of a first cutting traverse of the cutting tool holder and the lens holder is moved towards the cutting tool holder prior to a return cutting traverse of the cutting tool holder, thereby obviating fracture of the edge of the lens.
Claim 3
Dependent Claim
39 words
Apparatus according to claim 1 wherein the drive means includes a piston and cylinder device, a feed of pressure fluid to and from the device causing the lens holder to move towards or away from the cutter tool holder.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 1 wherein the drive means is urged by resilient means towards the backed-off position, movement of the lens holder towards the cutting tool holder being effected by the introduction of pressure fluid into the drive means.
Claim 5
Dependent Claim
33 words
Apparatus according to claim 1, wherein the control means includes a restrictor in an outlet for fluid from the drive means whereby the backing-off movement is at a rate determined by the restrictor.
Claim 6
Dependent Claim
70 words
Apparatus according to claim 1 wherein the drive means includes a piston and cylinder device which comprises two pistons one of which is arranged to restrict the movement of the other piston during the first cutting traverse so that the lens holder cannot move towards the cutting tool holder to the Full extent of its travel during said first cutting traverse, the lens holder being connected to said other piston.
Claim 7
Dependent Claim
37 words
Apparatus according to claim 5 wherein the two pistons are coaxially arranged, said other piston being located between axially spaced abutments formed on said one piston and the pistons each having a separate pressure fluid supply inlet.
Claim 8
Dependent Claim
38 words
Apparatus according to claim 5 wherein the fluid supply to the piston and cylinder device is controlled by electrically-operated valves providing for flow of fluid to and from the pistons along a fluid supply inlet for each piston.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |