Patent US3818293A successfully refreshed from Google Patents.
US3818293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control device for battery powered electric vehicles
Assignee: Individual
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Filing: 1973-03-06
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Granted: 1974-06-18
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Expires: 1993-03-06
Abstract
Abstract A resistance speed control for a battery driven electric vehicle, such as a golf cart. A combination of solenoid switching and a direct mechanical switching is employed to vary the total resistance in series with the electric motor of the vehicle. When the vehicle is placed in reverse and the accelerator pedal is fully depressed, the control automatically produces a slow backward speed to avoid the safety hazard of unexpectedly lurching backwards.
Inventors
- 👤 P Wood
- 👤 G Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:12
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; B; B60; B60L; B60L50/00; B60L50/50; B60L50/52; B60L2200/00; B60L2200/22; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
A speed control device for an electric motor driven vehicle comprising a plurality of resistors, a solenoid, a control switch connected to energize said solenoid, and circuit means for electrically connecting said resistors between a source of DC power and the motor of said vehicle, said circuit means including contact switch means having at least first, second and final positions, said switch means in said first position actuating said control switch to energize said solenoid, said circuit means connecting a first resistor circuit with said motor and power source when said solenoid is energized, said switch means in said second position connecting a second resistor in parallel with said first resistor, said switch means in said final position shunting said resistors to conNect said motor directly via a shunt line to said power source and actuating said control switch to de-energize said solenoid whereby the motor receives full power in said final position without current being drained off by said solenoid, and said switch means actuatable to a third position between said second and final positions, and including a third resistor and a reverse switch, said circuit means connecting said third resistor in parallel with said first and second resistors when said switch means is in said third position, said circuit means reversing the direction of rotation of said motor and breaking the circuit to said shunt line whenever said reverse switch is actuated whereby said motor will be operated at a speed determined by said second and third resistors connected in parallel when said reverse switch is actuated and said switch means is in said final position.
Claim 2
Dependent Claim
268 words
A speed control device for an electric motor driven vehicle comprising a plurality of resistors, a solenoid, a control switch connected to energize said solenoid, and circuit means for electrically connecting said resistors between a source of DC power and the motor of said vehicle, said circuit means including contact switch means having at least first, second and final positions, said switch means in said first position actuating said control switch to energize said solenoid, said circuit means connecting a first resistor circuit with said motor and power source when said solenoid is energized, said switch means in said second position connecting a second resistor in parallel with said first resistor, said switch means in said final position shunting said resistors to conNect said motor directly via a shunt line to said power source and actuating said control switch to de-energize said solenoid whereby the motor receives full power in said final position without current being drained off by said solenoid, and said switch means actuatable to a third position between said second and final positions, and including a third resistor and a reverse switch, said circuit means connecting said third resistor in parallel with said first and second resistors when said switch means is in said third position, said circuit means reversing the direction of rotation of said motor and breaking the circuit to said shunt line whenever said reverse switch is actuated whereby said motor will be operated at a speed determined by said second and third resistors connected in parallel when said reverse switch is actuated and said switch means is in said final position.
Claim 3
Dependent Claim
27 words
The invention as defined in claim 1 including an override switch for shunting the break in the circuit to said shunt line produced by said reverse switch.
Claim 4
Dependent Claim
37 words
The invention as defined in claim 1 including an operator driven vehicle having said DC power source, motor and speed control device mounted thereon for propelling the vehicle at a speed determined by said speed control device.
Claim 5
Dependent Claim
254 words
A speed control device for an electric motor driven vehicle comprising a plurality of resistors, a solenoid, a control switch connected to energize said solenoid, and circuit means for electrically connecting said resistors between a source of DC power and the motor of said vehicle, said circuit means including contact switch means having at least first, second and final positions, said switch means in said first position actuating said control switch to energize said solenoid, said circuit means connecting a first resistor circuit with said motor and power source when said solenoid is energized, said switch means in said second position connecting a second resistor in parallel with said first resistor, said switch means in said final position shunting said resistors to connect said motor directly to said power source and actuating said control switch to de-energize said solenoid whereby the motor receives full power in said final position without current being drained off by said solenoid, and a third resistor, a second solenoid, and a second control switch connected to energize said second solenoid, and wherein said switch means is actuatable to a third position between said first and second positions, said switch means in said third position actuating said second control switch to energize said second solenoid, said circuit means connecting said third resistor in parallel with said first resistor when said second solenoid is energized, said first and second control switches being electrically interlocked so that actuation of said first control switch in said final position de-energizes both of said solenoids.
Claim 6
Dependent Claim
254 words
A speed control device for an electric motor driven vehicle comprising a plurality of resistors, a solenoid, a control switch connected to energize said solenoid, and circuit means for electrically connecting said resistors between a source of DC power and the motor of said vehicle, said circuit means including contact switch means having at least first, second and final positions, said switch means in said first position actuating said control switch to energize said solenoid, said circuit means connecting a first resistor circuit with said motor and power source when said solenoid is energized, said switch means in said second position connecting a second resistor in parallel with said first resistor, said switch means in said final position shunting said resistors to connect said motor directly to said power source and actuating said control switch to de-energize said solenoid whereby the motor receives full power in said final position without current being drained off by said solenoid, and a third resistor, a second solenoid, and a second control switch connected to energize said second solenoid, and wherein said switch means is actuatable to a third position between said first and second positions, said switch means in said third position actuating said second control switch to energize said second solenoid, said circuit means connecting said third resistor in parallel with said first resistor when said second solenoid is energized, said first and second control switches being electrically interlocked so that actuation of said first control switch in said final position de-energizes both of said solenoids.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |