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US3867868A
Expired / Lapsed
US
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Apparatus for the machining of cycloidal surfaces
Assignee: Orszagos Koeolaj es Gazipari Troeszt
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Filing: 1973-05-14
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Granted: 1975-02-25
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Expires: 1993-05-14
Abstract
Abstract Cycloidal surfaces can be machined in a workpiece by displacing the latter relative to a chip-removal tool having a stationary axis, by mounting the workpiece upon the rotatable shaft of a tool holder, the shaft axis being displaced on a pivotal arm which is articulated to a crank centered on the tool axis. A gear train rotates the workpiece about the holder axis at a rate determined by the angular displacement of the arm, one end of which is guided along a linear path aligned with the tool axis. As a result high-precision single or multicuspid cycloidal configurations can be formed in the workpiece without the use of a template or master.
Inventors
- 👤 Lajos Natkai
- 👤 Janos Lenkefi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:11
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/08; B23; B23Q; B23Q27/00; B23Q27/006; Y; Y10; Y10S; Y10S451/00; Y10S451/919; Y10T; Y10T409/00; Y10T409/30; Y10T409/304368
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
An apparatus for the machining of a cycloidal workpiece to impart thereto the configuration of a cycloid defined by rotating an osculating circle in contact with a base circle, said circles having respective axes and different radii and together defining a center of moments, the smaller raduis circle lying within the larger radius circle, said apparatus comprising: a tool engageable with said workpiece at a machining location; a pivotal member having a pivot at said center; means for guiding said pivot in a linear path fixed with respect to said location and aligned therewith; a crank centered on said location and articulated to said member at one of said axes; means mounting said workpiece for rotation about the other of said axes; meshing gear means for rotating said mounting means about said other of said axes at a fixed ratio to the pivotal displacement of said crank, drive means operatively connected to said crank for rotating same about an axis aligned with said location, said tool being rotatable and having a radius less than the smallest radius of curvature of the cycloidal surface to be generated in said workpiece and smaller than either of said radii, and said tool being rotatable about an axis disposed upon a line connecting said path and said location but offset from said one of said axes.
Claim 2
Independent Claim
222 words
An apparatus for the machining of a cycloidal workpiece to impart thereto the configuration of a cycloid defined by rotating an osculating circle in contact with a base circle, said circles having respective axes and different radii and together defining a center of moments, the smaller raduis circle lying within the larger radius circle, said apparatus comprising: a tool engageable with said workpiece at a machining location; a pivotal member having a pivot at said center; means for guiding said pivot in a linear path fixed with respect to said location and aligned therewith; a crank centered on said location and articulated to said member at one of said axes; means mounting said workpiece for rotation about the other of said axes; meshing gear means for rotating said mounting means about said other of said axes at a fixed ratio to the pivotal displacement of said crank, drive means operatively connected to said crank for rotating same about an axis aligned with said location, said tool being rotatable and having a radius less than the smallest radius of curvature of the cycloidal surface to be generated in said workpiece and smaller than either of said radii, and said tool being rotatable about an axis disposed upon a line connecting said path and said location but offset from said one of said axes.
Claim 3
Dependent Claim
16 words
The apparatus defined in claim 1, further comprising means for synchronously connecting both said drive means.
Claim 4
Dependent Claim
30 words
The apparatus defined in claim 1 wherein said rotating means includes a gear operatively connected to said mounting means, and at least one further gear rotatably mounted on said member.
Claim 5
Dependent Claim
18 words
The apparatus defined in claim 3 wherein said rotating means includes a further gear keyed to said crank.
References Cited (Backward Citations)
DE1239213B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |