Patent US3769857A successfully refreshed from Google Patents.
US3769857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Change-speed gearing
Assignee: David Brown Corp PLC
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Filing: 1971-09-16
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Granted: 1973-11-06
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Expires: 1991-09-16
Abstract
Abstract A semi-automatic torque transmitting gearbox for a vehicle comprises an input member, first and second shafts co-axial with that member, a layshaft, gearing interposed between the input member and the layshaft and including freewheel means for permitting the layshaft to rotate faster than it can be driven by the input member through that gearing, gearing interposed between the first co-axial shaft and the layshaft which is of lower ratio than the first mentioned gearing, gearing interposed between the second co-axial shaft and the layshaft and including a disengagable clutch for positively connecting those shafts together via that gearing, a disengagable clutch for positively connecting together the first and second co-axial shafts, freewheel means for permitting the input member to rotate faster than the first co-axial shaft, and a disengagable clutch for positively connecting together the input member and the first coaxial shaft.
Inventors
- 👤 E Whateley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:35
CPC Classifications
F; F16; F16H; F16H3/00; F16H3/02; F16H3/08; F16H3/10; F16H3/087; F16H3/091; F16H3/0915; F16H2200/00; F16H2200/003; F16H2200/006; F16H47/00; F16H47/06; F16H61/00; F16H61/68; F16H61/684; F16H61/688; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19219; Y10T74/19228; Y10T74/19377; Y10T74/19386; Y10T74/194
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A gearbox comprising an input member, first and second shafts co-axial with said member, a layshaft, gearing interposed between the input member and the layshaft and including freewheel means for permitting the layshaft to rotate faster than it can be driven by the input member through said gearing, gearing interposed between the first co-axial shaft and the layshaft which is of lower ratio than the first mentioned gearing, gearing interposed between the second co-axial shaft and the layshaft and including a disengagable clutch for positively connecting said shafts together via said gearing, a disengagable clutch for positively connecting together the first and second co-axial shafts, freewheel means for permitting the input member to rotate faster than the first co-axial shaft, and a disengagable clutch for positively connecting together said member and said shaft.
Claim 2
Dependent Claim
133 words
A gearbox comprising an input member, first and second shafts co-axial with said member, a layshaft, gearing interposed between the input member and the layshaft and including freewheel means for permitting the layshaft to rotate faster than it can be driven by the input member through said gearing, gearing interposed between the first co-axial shaft and the layshaft which is of lower ratio than the first mentioned gearing, gearing interposed between the second co-axial shaft and the layshaft and including a disengagable clutch for positively connecting said shafts together via said gearing, a disengagable clutch for positively connecting together the first and second co-axial shafts, freewheel means for permitting the input member to rotate faster than the first co-axial shaft, and a disengagable clutch for positively connecting together said member and said shaft.
Claim 3
Dependent Claim
172 words
A gearbox comprising an input member, first and second shafts co-axial with said member, a layshaft, gearing interposed between the input member and the layshaft and including freewheel means for permitting the layshaft to rotate faster than it can be driven by the input member through said gearing, gearing interposed between the first co-axial shaft and the layshaft and including freewheel means for permitting the first co-axial shaft to rotate faster than it can be driven by the layshaft through said gearing and also including a disengagable clutch for positively connecting said shafts together via said gearing which is of lower ratio than the first mentioned gearing, gearing interposed between the second co-axial shaft and the layshaft and including a disengagable clutch for positively connecting said shafts together via said gearing, a disengagable clutch for positively connecting together the first and second co-axial shafts, freewheel means for permitting the input member to rotate faster than the first co-axial shaft, and a disengagable clutch for positively connecting together said member and said shaft.
Claim 4
Dependent Claim
172 words
A gearbox comprising an input member, first and second shafts co-axial with said member, a layshaft, gearing interposed between the input member and the layshaft and including freewheel means for permitting the layshaft to rotate faster than it can be driven by the input member through said gearing, gearing interposed between the first co-axial shaft and the layshaft and including freewheel means for permitting the first co-axial shaft to rotate faster than it can be driven by the layshaft through said gearing and also including a disengagable clutch for positively connecting said shafts together via said gearing which is of lower ratio than the first mentioned gearing, gearing interposed between the second co-axial shaft and the layshaft and including a disengagable clutch for positively connecting said shafts together via said gearing, a disengagable clutch for positively connecting together the first and second co-axial shafts, freewheel means for permitting the input member to rotate faster than the first co-axial shaft, and a disengagable clutch for positively connecting together said member and said shaft.
Claim 5
Dependent Claim
21 words
A gearbox according to claim 1, wherein the input member is drivably connected to the output member of a fluid coupling.
Claim 6
Dependent Claim
41 words
A gearbox according to claim 1, wherein the gearing interposed between the second co-axial shaft and the lay-shaft includes a sleeve surrounding the layshaft and carrying the driven half of the associated clutch and a gear forming part of said gearing.
Claim 7
Dependent Claim
65 words
A gearbox according to claim 4, comprising a third shaft co-axial with the input member, a further gear on the sleeve having a different pitch circle diameter to the first mentioned gear thereon and meshing with a gear rotatable on the third co-axial shaft, and a clutch for selectively connecting the third co-axial shaft either to the gear thereon or to the second co-axial shaft.
Claim 8
Dependent Claim
50 words
A gearbox according to claim 1, having reverse mechanism comprising a reverse shaft; gearing interposed between the first co-axial shaft, the reverse shaft and a gear on the layshaft forming part of the gearing interposed between the second co-axial shaft and the layshaft; and a disengagable clutch in said mechanism.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |