US3877177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for machining spherical surfaces
Assignee: Canon Inc
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Filing: 1973-07-09
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Granted: 1975-04-15
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Expires: 1993-07-09
Abstract
Abstract A device for machining spherical surfaces of a workpiece, such as a lens, which can evenly grind the surface to be treated by placing the surface of the workpiece in contact with a tool, such as an abrasive wheel, at a constant rate. The tool is inclined with respect to the workpiece to form an angle between the rotating shaft of the workpiece and the rotating shaft of the tool. Both the tool and the workpiece are designed to be moved on the intersection of the rotating shaft of the workpiece and the rotating shaft of the tool.
Inventors
- 👤 Tadasu Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:14
CPC Classifications
B; B24; B24B; B24B13/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A device for machining a spherical surface on a workpiece comprising, workpiece holding means for rotatably holding the workpiece, workpiece rotating means for causing said workpiece to rotate normally in a predetermined direction at a preset rotational speed, tool holding means for rotatably holding a tool adapted to grind the workpiece, the rotating axis of said tool being inclined relative to the rotating axis of said workpiece, and tool rotating means for causing said tool to rotate in the same direction as that of said workpiece and at a rotational speed obtained by multiplying the inverse of the cosine of an angle formed by said inclination between said rotating axis of said workpiece and said rotating axis of the tool by the rotational speed of the workpiece.
Claim 2
Independent Claim
127 words
A device for machining a spherical surface on a workpiece comprising, workpiece holding means for rotatably holding the workpiece, workpiece rotating means for causing said workpiece to rotate normally in a predetermined direction at a preset rotational speed, tool holding means for rotatably holding a tool adapted to grind the workpiece, the rotating axis of said tool being inclined relative to the rotating axis of said workpiece, and tool rotating means for causing said tool to rotate in the same direction as that of said workpiece and at a rotational speed obtained by multiplying the inverse of the cosine of an angle formed by said inclination between said rotating axis of said workpiece and said rotating axis of the tool by the rotational speed of the workpiece.
Claim 3
Dependent Claim
33 words
A device for machining spherical surfaces as claimed in claim 1 further comprising means for Varying said angle formed between the rotating axis of said workpiece and the rotating axis of said tool.
Claim 4
Dependent Claim
35 words
A device for machining spherical surfaces as claimed in claim 1 further comprising means for moving said tool about the intersection of the rotating axis of said workpiece and the rotating axis of said tool.
Claim 5
Dependent Claim
35 words
A device for machining spherical surfaces as claimed in claim 1 further comprising means for moving said workpiece about the intersection of the rotating axis of said workpiece and the rotating axis of said tool.
Claim 6
Dependent Claim
72 words
A device for machining spherical surfaces as claimed in claim 1 further comprising means for setting said angle formed between the rotating axis of said workpiece and the rotating axis of said tool so that the distance from a position, in which said tool is in contact with said workpiece, to the rotating axis of said workpiece is within approximately 60 percent of the radius of the spherical surface for said workpiece.
Claim 7
Dependent Claim
40 words
A device for machining spherical surfaces as claimed in claim 1 further comprising means for setting said angle formed between the rotating axis of said workpiece and the rotating axis of said tool in the order between 90* and 55*.
Claim 8
Dependent Claim
29 words
A device for machining spherical surfaces as claimed in claim 6 wherein the radius of the spherical surface for said workpiece is larger than the radius of said tool.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |