US3114871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor truck control
Assignee: Doosan Bobcat North America Inc
•
Filing: 1958-05-21
•
Granted: 1963-12-17
•
Expires: 1978-05-21
Abstract
No abstract record available.
Inventors
- 👤 Frank J Schenkelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:12
CPC Classifications
F; F15; F15B; F15B7/00; F15B7/005; B; B60; B60K; B60K1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN CONTROL MEANS FOR A VEHICLE HAVING AN ELECTRIC DRIVE MOTOR, A CARBON PILE REGULATOR FOR STEPLESSLY ADJUSTING THE ROTATIONAL SPEED OF THE MOTOR, A HYDRAULIC CONTROL CIRCUIT COMPRISING A CONTINUOUSLY OPERATING ACTUATOR OPERABLE INDEPENDENTLY OF THE SPEED OF ROTATION OF SAID MOTOR AND EFFECTIVE FOR AXIALLY AND CONTINUOUSLY COMPRESSING SAID REGULATOR TO VARIABLE EXTENT EFFECTIVE FOR ADJUSTING ITS RESISTANCE AND THE ROTATIONAL SPEED OF SAID MOTOR, AN ACCELERATOR PEDAL OPERABLE INDEPENDENTLY OF THE SPEED OF ROTATION OF SAID MOTOR FOR VARYING HYDRAULIC PRESSURE IN SAID CONTROL CIRCUIT THEREBY TO CONTROL THE ROTATIONAL SPEED OF SAID MOTOR, ELECTRIC CIRCUIT MEANS FOR SHUNTING SAID REGULATOR FOR HIGH SPEED OPERATION OF SAID MOTOR, SWITCH MEANS OPERABLE RESPONSIVE TO OPERATION OF SAID ACCELERATOR PEDAL FOR CONTROLLING SAID ELECTRIC CIRCUIT MEANS, AND MEANS FOR DELAYING ENERGIZATION OF SAID ELECTRIC CIRCUIT MEANS SUBSEQUENT TO ACTUATION OF SAID SWITCH MEANS.
Claim 2
Dependent Claim
144 words
IN CONTROL MEANS FOR A VEHICLE HAVING AN ELECTRIC DRIVE MOTOR, A CARBON PILE REGULATOR FOR STEPLESSLY ADJUSTING THE ROTATIONAL SPEED OF THE MOTOR, A HYDRAULIC CONTROL CIRCUIT COMPRISING A CONTINUOUSLY OPERATING ACTUATOR OPERABLE INDEPENDENTLY OF THE SPEED OF ROTATION OF SAID MOTOR AND EFFECTIVE FOR AXIALLY AND CONTINUOUSLY COMPRESSING SAID REGULATOR TO VARIABLE EXTENT EFFECTIVE FOR ADJUSTING ITS RESISTANCE AND THE ROTATIONAL SPEED OF SAID MOTOR, AN ACCELERATOR PEDAL OPERABLE INDEPENDENTLY OF THE SPEED OF ROTATION OF SAID MOTOR FOR VARYING HYDRAULIC PRESSURE IN SAID CONTROL CIRCUIT THEREBY TO CONTROL THE ROTATIONAL SPEED OF SAID MOTOR, ELECTRIC CIRCUIT MEANS FOR SHUNTING SAID REGULATOR FOR HIGH SPEED OPERATION OF SAID MOTOR, SWITCH MEANS OPERABLE RESPONSIVE TO OPERATION OF SAID ACCELERATOR PEDAL FOR CONTROLLING SAID ELECTRIC CIRCUIT MEANS, AND MEANS FOR DELAYING ENERGIZATION OF SAID ELECTRIC CIRCUIT MEANS SUBSEQUENT TO ACTUATION OF SAID SWITCH MEANS.
References Cited (Backward Citations)
US2134900A
Cited
US2267381A
Cited
GB512724A
Cited
US2386304A
Cited
US2397213A
Cited
US2454291A
Cited
US2890683A
Cited
US2911053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-16 | 1967-06-17 | 1967-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-16 | 1971-06-17 | 1971-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-16 | 1975-06-17 | 1975-12-17 | $7700.00 | Window Closed / Lapsed |