US3249841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic brake system
Assignee: Motors Liquidation Co
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Filing: 1963-07-11
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Granted: 1966-05-03
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Expires: 1983-07-11
Abstract
No abstract record available.
Inventors
- 👤 Benjamin C Liebenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:51
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/02; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A DYNAMIC BRAKE SYSTEM COMPRISING AN ELECTRICAL MACHINE INCLUDING A VARIABLY DRIVEN ARMATURE AND A FIELD WINDING, MEANS FOR ENERGIZING SAID WINDING, A DYNAMIC BRAKE RESISTANCE CONNECTED ACROSS THE ARMATURE OF SAID MACHINE FOR DISSIPATING IN THE FORM OF HEAT THE ENERGY GENERATED THEREBY, MANUALLY OPERABLE MEANS TO SELECT A PREDETERMINED VALUE OF DYNAMIC BRAKING CURRENT FLOW THROUGH SAID ARMATURE, AND MEANS RESPONSIVE TO THE CURRENT FLOW THROUGH SAID ARMATURE TO VARY THE MAGNITUDE OF SAID RESISTANCE AND AUTOMATICALLY MAINTAIN SAID CURRENT SUBSTANTIALLY CONSTANT FOR A PREDETERMINED RANGE OF ARMATURE SPEEDS, SAID LAST MENTIONED MEANS INCLUDING A PAIR OF OPPOSITELY POLARIZED RELAYS, A POTENTIOMETER CIRCUIT CONTROLLED BY SAID MANUALLY OPERABLE MEANS TO APPLY A VOLTAGE TO SAID POLARIZED RELAYS, AND A TRANSDUCTOR IN CIRCUIT WITH SAID MOTOR ARMATURE TO APPLY A VOLTAGE REFLECTIVE OF MOTOR ARMATURE CURRENT TO SAID RELAYS IN OPPOSITION TO THE VOLTAGE APPLIED THERETO BY SAID POTENTIOMETER CIRCUIT, ONE SAID RELAYS BEING RESPNSIVE TO A PREDETERMINED VOLTAGE DIFFERENTIAL BETWEEN THE VOLTAGES APPLIED THERETO WHEREIN SAID POTENTIOMETER VOLTAGE IS THE DOMINANT VOLTAGE TO DECREASE THE MAGNTITUDE OF SAID RESISTANCE,
Claim 2
Dependent Claim
181 words
A DYNAMIC BRAKE SYSTEM COMPRISING AN ELECTRICAL MACHINE INCLUDING A VARIABLY DRIVEN ARMATURE AND A FIELD WINDING, MEANS FOR ENERGIZING SAID WINDING, A DYNAMIC BRAKE RESISTANCE CONNECTED ACROSS THE ARMATURE OF SAID MACHINE FOR DISSIPATING IN THE FORM OF HEAT THE ENERGY GENERATED THEREBY, MANUALLY OPERABLE MEANS TO SELECT A PREDETERMINED VALUE OF DYNAMIC BRAKING CURRENT FLOW THROUGH SAID ARMATURE, AND MEANS RESPONSIVE TO THE CURRENT FLOW THROUGH SAID ARMATURE TO VARY THE MAGNITUDE OF SAID RESISTANCE AND AUTOMATICALLY MAINTAIN SAID CURRENT SUBSTANTIALLY CONSTANT FOR A PREDETERMINED RANGE OF ARMATURE SPEEDS, SAID LAST MENTIONED MEANS INCLUDING A PAIR OF OPPOSITELY POLARIZED RELAYS, A POTENTIOMETER CIRCUIT CONTROLLED BY SAID MANUALLY OPERABLE MEANS TO APPLY A VOLTAGE TO SAID POLARIZED RELAYS, AND A TRANSDUCTOR IN CIRCUIT WITH SAID MOTOR ARMATURE TO APPLY A VOLTAGE REFLECTIVE OF MOTOR ARMATURE CURRENT TO SAID RELAYS IN OPPOSITION TO THE VOLTAGE APPLIED THERETO BY SAID POTENTIOMETER CIRCUIT, ONE SAID RELAYS BEING RESPNSIVE TO A PREDETERMINED VOLTAGE DIFFERENTIAL BETWEEN THE VOLTAGES APPLIED THERETO WHEREIN SAID POTENTIOMETER VOLTAGE IS THE DOMINANT VOLTAGE TO DECREASE THE MAGNTITUDE OF SAID RESISTANCE,
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |