US3373316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical control system for an industrial truck
Assignee: Eaton Corp
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Filing: 1965-10-26
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Granted: 1968-03-12
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Expires: 1985-10-26
Abstract
No abstract record available.
Inventors
- 👤 Palmer Norman Harold George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/0833; H02H7/0844; B; B60; B60L; B60L50/00; B60L50/50; B60L50/52; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
AN ELECTRICAL CONTROL SYSTEM FOR AN INDUSTRIAL TRUCK, COMPRISING AN ELECTRIC MOTOR FOR DRIVING THE TRUCK, THE MOTOR INCORPORATION A FIELD COIL ASSEMBLY, A FIRST PAIR OF CONTACTORS WHICH WHEN CLOSED PERMIT CURRENT FLOW THROUGH THE FIELD COIL ASSEMBLY IN ONE DIRECTION, A SECOND PAIR OF CONTACTORS WHICH WHEN CLOSED PERMIT CURRENT FLOW THROUGH THE FIELD COIL ASSEMBLY IN THE OPPOSITE DIRECTION, A PAIR OF TERMINALS WHICH IN USE ARE CONNECTED TO THE TRUCK BATTERY, AT LEAST ONE SWITCHING DEVICE CONTROLLING CURRENT FLOW FROM SAID PAIR OF TERMINALS THROUGH THE CONTACTORS TO THE FIELD COIL ASSEMBLY, MEANS FOR SWITCHING SAID DEVICE ON AND OFF TO PROVIDE A PULSATING CURRENT FLOW FROM TERMINALS, A SAFETY CIRCUIT FOR OPENING THE CONTACTORS WHENEVER A SWITCHING DEVICE IS ON FOR LONGER THAN A PREDETERMINED PERIOD OF TIME, A TESTING CIRCUIT OPERABLE BEFORE THE TRUCK IS MOVED TEST THE SAFETY CIRCUIT, AND MEANS PREVENTING CLOSING OF THE CONTACTORS UNLESS THE SAFETY CIRCUIT IS FIRST TESTED AND IS OPERATIVE.
Claim 2
Dependent Claim
163 words
AN ELECTRICAL CONTROL SYSTEM FOR AN INDUSTRIAL TRUCK, COMPRISING AN ELECTRIC MOTOR FOR DRIVING THE TRUCK, THE MOTOR INCORPORATION A FIELD COIL ASSEMBLY, A FIRST PAIR OF CONTACTORS WHICH WHEN CLOSED PERMIT CURRENT FLOW THROUGH THE FIELD COIL ASSEMBLY IN ONE DIRECTION, A SECOND PAIR OF CONTACTORS WHICH WHEN CLOSED PERMIT CURRENT FLOW THROUGH THE FIELD COIL ASSEMBLY IN THE OPPOSITE DIRECTION, A PAIR OF TERMINALS WHICH IN USE ARE CONNECTED TO THE TRUCK BATTERY, AT LEAST ONE SWITCHING DEVICE CONTROLLING CURRENT FLOW FROM SAID PAIR OF TERMINALS THROUGH THE CONTACTORS TO THE FIELD COIL ASSEMBLY, MEANS FOR SWITCHING SAID DEVICE ON AND OFF TO PROVIDE A PULSATING CURRENT FLOW FROM TERMINALS, A SAFETY CIRCUIT FOR OPENING THE CONTACTORS WHENEVER A SWITCHING DEVICE IS ON FOR LONGER THAN A PREDETERMINED PERIOD OF TIME, A TESTING CIRCUIT OPERABLE BEFORE THE TRUCK IS MOVED TEST THE SAFETY CIRCUIT, AND MEANS PREVENTING CLOSING OF THE CONTACTORS UNLESS THE SAFETY CIRCUIT IS FIRST TESTED AND IS OPERATIVE.
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) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |