Patent US4304155A successfully refreshed from Google Patents.
US4304155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power shift transmissions
Assignee: Brockhouse Transmissions Ltd
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Filing: 1979-09-24
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Granted: 1981-12-08
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Expires: 1999-09-24
Abstract
Abstract A transmission comprising a torque convertor and a power shift gear box having rotatable input and output shafts, multi-ratio drive means to produce different speeds of rotation of the output shaft relative to the input shaft, said drive means including gears which are in constant mesh and clutches, which are engageable and disengageable under load, to connect the gears in a desired drive path, control means for operating the clutches of the multi-ratio drive means to change the ratio of the gear box in dependence upon an electrical signal derived from rotation of a first element associated with the torque convertor input shaft and of a second element associated with an intermediate shaft upstream of the multi-ratio drive means and downstream of a variable torque capacity clutch located between the torque convertor output shaft and the multi-ratio drive means.
Inventors
- 👤 Denis V. J. Want
- 👤 Norman Schofield
- 👤 Richard Gibbens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:17
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W10/00; B60W10/02; B60W10/10; B60W2710/00; B60W2710/02; B60W2710/021; B60W2710/10; B60W2710/1005; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19153; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926; Y10T74/19377; Y10T74/19386; Y10T74/19405; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19437
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A transmission comprising a torque convertor having an input shaft and an output shaft, a power shift gear box having rotatable input and output shafts and multi-ratio drive means to produce different speeds of rotation of the output shaft relative to the input shaft, said drive means including gears which are in constant mesh and clutches, which are engageable and disengageable under load, to connect the gears in a desired drive path, a variable torque capacity clutch located between the torque convertor output shaft and the multi-ratio drive means, means under the manual control of an operator for controlling the instantaneous torque transmittal capacity of said clutch, and control means for operating the clutches of the multi-ratio drive means to change the ratio of the gear box in dependence upon an electrical signal derived from rotation of a first element associated with the torque convertor input shaft and of a second element associated with an intermediate shaft upstream of the multi-ratio drive means and downstream of said variable torque capacity clutch.
Claim 2
Dependent Claim
171 words
A transmission comprising a torque convertor having an input shaft and an output shaft, a power shift gear box having rotatable input and output shafts and multi-ratio drive means to produce different speeds of rotation of the output shaft relative to the input shaft, said drive means including gears which are in constant mesh and clutches, which are engageable and disengageable under load, to connect the gears in a desired drive path, a variable torque capacity clutch located between the torque convertor output shaft and the multi-ratio drive means, means under the manual control of an operator for controlling the instantaneous torque transmittal capacity of said clutch, and control means for operating the clutches of the multi-ratio drive means to change the ratio of the gear box in dependence upon an electrical signal derived from rotation of a first element associated with the torque convertor input shaft and of a second element associated with an intermediate shaft upstream of the multi-ratio drive means and downstream of said variable torque capacity clutch.
Claim 3
Dependent Claim
21 words
A transmission according to claim 1 wherein the variable torque capacity clutch is associated with a forward and reverse drive means.
Claim 4
Dependent Claim
33 words
A transmission according to claim 2 wherein the forward and reverse drive means provides the same speed of rotation of the output shaft relative to the input shaft in forward and in reverse.
Claim 5
Dependent Claim
20 words
A transmission according to claim 1 wherein the control means operates the clutches solely in dependence upon said electrical signal.
Claim 6
Dependent Claim
23 words
A transmission according to claim 1 further including transducers adapted to sense directly the speed of rotation of the input and intermediate shafts.
Claim 7
Dependent Claim
26 words
A transmission according to claim 5 wherein said transducers produce pulses the frequency of which is proportional to the speed of rotation of the associated elements.
Claim 8
Dependent Claim
11 words
A fork lift truck incorporating a transmission according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |