US3587798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time and speed modulated clutch and brake
Assignee: REED-CHATWOOD Inc
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Filing: 1968-09-18
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Granted: 1971-06-28
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Expires: 1988-09-18
Abstract
Abstract DRIVE SYSTEM FOR A ROTATABLE, VARIABLE INERTIA LOAD COMPRISING A CONSTANT SPEED INPUT DRIVE, A VARIABLE-TORQUE, ELECTRICALLY OPERATED FRACTION CLUTCH FOR CONNECTING THE INPUT DRIVE TO THE LOAD, AND A VARIABLE-TORQUE, ELECTRICALLY OPERATED FRICTION BRAKE FOR THE LOAD. WHEN STARTING THE LOAD, A FIRST RAMP GENERATOR PRODUCES AN INCREASING RAMP VOLTAGE WHICH IS COMPARED TO A LOAD VELOCITY SIGNAL TO PROVIDE AN ERROR SIGNAL FOR ENERGIZING THE CLUTCH. WHEN STOPPING THE LOAD, A SECOND RAMP GENERATOR PRODUCES A DECREASING RAMP VOLTAGE WHICH IS COMPARED TO A LOAD VELOCITY SIGNAL TO PROVIDE AN ERROR SIGNAL FOR ENERGIZING THE BRAKE.
Inventors
- 👤 Ralph H Schuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:52
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |