Patent US3837233A successfully refreshed from Google Patents.
US3837233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously variable friction drive having intermediate member engaged on both sides for increased torque transmission
Assignee: Individual
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Filing: 1973-07-17
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Granted: 1974-09-24
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Expires: 1993-07-17
Abstract
Abstract The invention provides a continuously variable friction drive comprising first and second members rotatable about a first axis and having convex and concave driving surfaces respectively, a third member rotatable about a second axis intersecting the first axis and having concave and convex driving surfaces arranged respectively to engage the convex and concave driving surfaces on the first and second members respectively, a pivotal mounting for the third member arranged so that the third member may pivot about a third axis, clamping means for causing relative movement between the first and second members thus to force parts of the driving surfaces on the first and second members into close proximity with adjacent parts of the driving surfaces on the third member, said parts providing drive areas through which drive takes place between the first and second members on the one hand and the third member on the other hand and actuating means for pivoting the third member about the third axis thus to vary the distances of said drive areas from at least one of the first and second axes thus to vary the ratio of the drive, the drive areas being substantially symmetrically disposed about a line passing through the intersection of said first and second axes.
Inventors
- 👤 M French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:38
CPC Classifications
F; F16; F16H; F16H15/00; F16H15/02; F16H15/04; F16H15/44; F16H15/06; F16H15/26; F16H15/28
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
206 words
A continuously variable friction drive comprising co-axial first and second members rotatable about a first axis and having convex and concave driving surfaces respectively, a third member rotatable about a second axis intersecting the first axis and having concave and convex driving surfaces arranged respectively to engage the convex and concave driving surfaces on the first and second members respectively, a pivotal mounting for the third member arranged so that the third member may pivot about a third axis, clamping means for causing relative movement between the first and second members thus to force parts of the driving surfaces on the first and second members into close proximity with adjacent parts of the driving surfaces on the third member, said parts providing drive areas through which drive takes place between the first and second members on the one hand and the third member on the other hand and actuating means for pivoting the third member about the third axis thus to vary the distances of said drive areas from at least one of the first and second axes thus to vary the ratio of the drive, the drive areas being substantially symmetrically disposed about a line passing through the intersection of said first and second axes.
Claim 2
Dependent Claim
206 words
A continuously variable friction drive comprising co-axial first and second members rotatable about a first axis and having convex and concave driving surfaces respectively, a third member rotatable about a second axis intersecting the first axis and having concave and convex driving surfaces arranged respectively to engage the convex and concave driving surfaces on the first and second members respectively, a pivotal mounting for the third member arranged so that the third member may pivot about a third axis, clamping means for causing relative movement between the first and second members thus to force parts of the driving surfaces on the first and second members into close proximity with adjacent parts of the driving surfaces on the third member, said parts providing drive areas through which drive takes place between the first and second members on the one hand and the third member on the other hand and actuating means for pivoting the third member about the third axis thus to vary the distances of said drive areas from at least one of the first and second axes thus to vary the ratio of the drive, the drive areas being substantially symmetrically disposed about a line passing through the intersection of said first and second axes.
Claim 3
Dependent Claim
41 words
A friction drive according to claim 1 in which two third members are provided, the third members each being pivotable in synchronism about a third axis and rotatable about a second axis, both said second axes and said first axis intersecting.
Claim 4
Dependent Claim
41 words
A friction drive according to claim 2 in which there are two sets of first and second members rotatable about a common first axis and the two third members are in engagement with the first and second members of each set.
Claim 5
Dependent Claim
18 words
A friction drive according to claim 1 in which the first, second and third members are generally bowl-shaped.
Claim 6
Dependent Claim
36 words
A friction drive according to claim 1 in which three of the four driving surfaces provided on the or each third member and the co-operating first and second members are toroidal and defined by circular arcs.
Claim 7
Dependent Claim
49 words
A friction drive according to claim 1 in which the driving surfaces are so shaped that, during the pivoting of the or each third member, as the distances of the contact areas from the first axis decrease the distances from the second axis or axes increase and vice versa.
Claim 8
Dependent Claim
48 words
A friction drive according to claim 1 in which the driving surfaces are so shaped that, during the pivoting of the or each third member, the distances of the contact areas from the second axis or axes remain the same and the distances from the first axis vary.
Claim 9
Dependent Claim
45 words
A friction drive according to claim 1 in which the driving surfaces are so shaped that, during the pivoting of the or each third member, the drive areas sweep through a larger angle about the third axis or axes than the third member or members.
Claim 10
Dependent Claim
19 words
A friction drive according to claim 1 in which the clamping means comprises an hydraulic piston and cylinder arrangement.
Claim 11
Dependent Claim
19 words
A friction drive according to claim 1 in which the clamping means comprises a ball or roller cam arrangement.
Claim 12
Dependent Claim
15 words
A friction drive according to claim 1 in which the clamping means comprises a spring.
References Cited (Backward Citations)
US2660073A
Cited
US2850911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |