US3712153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incremental gear drive
Assignee: Combined Engineered Products Ltd
•
Filing: 1970-12-28
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Granted: 1973-01-23
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Expires: 1990-12-28
Abstract
Abstract An incremental gear drive comprises input and output shafts journalled for rotation about a common axis, the shafts being drivingly connected through a multiple reduction gear train in a rotatable housing, the gears of which are caused to rotate at a controlled speed either the same as the housing or different therefrom to effect a controlled difference of speed between the input and output shafts. The unit includes a control shaft which is driven by a control motor, connected to the first pinion of the gear train.
Inventors
- 👤 F East
- 👤 F Bichard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:45
CPC Classifications
B; B21; B21B; B21B35/00; B21B35/12; B21B35/02; F; F16; F16H; F16H3/00; F16H3/44; F16H3/72; F16H47/00; F16H47/02; F16H47/04; B21B2035/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
273 words
An incremental gear drive comprising: an input shaft and an output shaft, said shafts being journalled for rotation about a common axis, a first externally toothed gear rigidly connected to one of said shafts for rotation therewith, a rotatable housing rigidly connected to the other one of said shafts for rotation therewith, an intermediate shaft journalled for rotation about said common axis, a control shaft, a first double speed reduction gear train for transmitting torQue from the intermediate shaft to said one shaft, said first double speed reduction gear train comprising: a. a first set of countershaft gears journalled in said housing and meshing with the first externally toothed gear, b. a second externally toothed gear rigidly connected to the intermediate shaft for rotation therewith, and c. a second set of countershaft gears rotatable with the first set of countershaft gears and meshing with said second externally toothed gear; a second double speed reduction gear train for transmitting torque from the control shaft to the intermediate shaft, said second double speed reduction gear train comprising: a. a third externally toothed gear rigidly connected to the intermediate shaft for rotation therewith, b. a fourth externally toothed gear rigidly connected to the control shaft for rotation therewith, c. a third set of countershaft gears journalled in the housing and meshing with the third externally toothed gear, and d. a fourth set of countershaft gears rotatable with the third set of countershaft gears and meshing with the fourth externally toothed gear; and variable speed drive means connected to the control shaft whereby to produce a controlled variable difference of speed between said input and output shafts.
Claim 2
Dependent Claim
273 words
An incremental gear drive comprising: an input shaft and an output shaft, said shafts being journalled for rotation about a common axis, a first externally toothed gear rigidly connected to one of said shafts for rotation therewith, a rotatable housing rigidly connected to the other one of said shafts for rotation therewith, an intermediate shaft journalled for rotation about said common axis, a control shaft, a first double speed reduction gear train for transmitting torQue from the intermediate shaft to said one shaft, said first double speed reduction gear train comprising: a. a first set of countershaft gears journalled in said housing and meshing with the first externally toothed gear, b. a second externally toothed gear rigidly connected to the intermediate shaft for rotation therewith, and c. a second set of countershaft gears rotatable with the first set of countershaft gears and meshing with said second externally toothed gear; a second double speed reduction gear train for transmitting torque from the control shaft to the intermediate shaft, said second double speed reduction gear train comprising: a. a third externally toothed gear rigidly connected to the intermediate shaft for rotation therewith, b. a fourth externally toothed gear rigidly connected to the control shaft for rotation therewith, c. a third set of countershaft gears journalled in the housing and meshing with the third externally toothed gear, and d. a fourth set of countershaft gears rotatable with the third set of countershaft gears and meshing with the fourth externally toothed gear; and variable speed drive means connected to the control shaft whereby to produce a controlled variable difference of speed between said input and output shafts.
Claim 3
Dependent Claim
20 words
An incremental gear drive according to claim 1, wherein the control shaft is journalled for rotation about said common axis.
Claim 4
Dependent Claim
33 words
An incremental gear drive according to claim 2 wherein one of said input and output shafts is a hollow sleeve, the other of said input and output shafts extending along the hollow sleeve.
Claim 5
Dependent Claim
31 words
An incremental gear drive according to claim 3, wherein the variable speed drive means comprises a motor having a casing which is rigidly connected to the input shaft for rotation therewith.
Claim 6
Dependent Claim
18 words
An incremental gear drive according to claim 3, wherein the variable speed drive means is a hydraulic motor.
Claim 7
Dependent Claim
57 words
An incremental gear drive according to claim 5, including an auxiliary shaft journalled for rotation about an axis which is parallel to and spaced from said common axis, a gear train operatively connecting the auxiliary shaft with said input shaft, and a hydraulic pump for supplying the motor, the hydraulic pump being driven from said auxiliary shaft.
Claim 8
Dependent Claim
84 words
An incremental gear drive according to claim 6, further comprising a stationary housing wherein said input and output shafts, and said intermediate, control and auxiliary shafts are journalled, the input and output shafts extending from one end of the stationary housing, the auxiliary shaft and the control shaft extending from the other end of the stationary housing, and the hydraulic pump and motor being mounted on said other end of the stationary housing and operatively connected to said auxiliary shaft and control shaft respectively.
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |