US3842288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blower motor control circuit
Assignee: FARMERS & MERCHANTS NATIONAL BANK
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Filing: 1973-10-25
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Granted: 1974-10-15
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Expires: 1993-10-25
Abstract
Abstract A control circuit for the blower motor of a cold-plate refrigeration system in a vehicle providing continuous operation from the vehicle battery system and means for automatically charging the vehicle battery that connects to a standard AC voltage supply.
Inventors
- 👤 D Bradshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:06
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/90; H02J7/96; H02J7/971; H02J7/975
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
In a control circuit for operating a DC blower motor in a refrigerated vehicle or the like having a vehicle battery as a DC source for the blower motor, blower energizing means for controlling the application of the vehicle battery to the blower motor, charging control means for rectifying and applying an external AC supply voltage to the vehicle battery to maintain a predetermined charging condition, and vehicle ignition switch means, said blower energizing means including control switch means and a relay, said relay including a coil and a pair of relay contacts, said relay contacts being connected to control the application of the vehicle battery to the blower motor, said relay coil being connected in series combination with said ignition switch means, the vehicle battery and said control switch means, said relay contacts energizing the blower motor when said ignition switch means and said control switch means are closed.
Claim 2
Dependent Claim
150 words
In a control circuit for operating a DC blower motor in a refrigerated vehicle or the like having a vehicle battery as a DC source for the blower motor, blower energizing means for controlling the application of the vehicle battery to the blower motor, charging control means for rectifying and applying an external AC supply voltage to the vehicle battery to maintain a predetermined charging condition, and vehicle ignition switch means, said blower energizing means including control switch means and a relay, said relay including a coil and a pair of relay contacts, said relay contacts being connected to control the application of the vehicle battery to the blower motor, said relay coil being connected in series combination with said ignition switch means, the vehicle battery and said control switch means, said relay contacts energizing the blower motor when said ignition switch means and said control switch means are closed.
Claim 3
Dependent Claim
62 words
The control circuit of claim 1 further characterized in that said charging control means includes a charging supply output, said charging supply output being connected across the series connection of said relay coil, and said control switch means to energize said relay coil when said control switch means are closed, thereby providing closure of said relay contacts to energize the blower motor.
Claim 4
Dependent Claim
40 words
The control circuit of claim 2 further characterized in that said control switch means includes thermostatic switch means for providing a closure indication when the temperature is above a predetermined desired operating temperature in the refrigerated section of the vehicle.
Claim 5
Dependent Claim
37 words
The control circuit of claim 3 further characterized in that said control switch means includes door closure switch means that provide a closure indication only when all doors of the refrigerated section of the vehicle are closed.
Claim 6
Dependent Claim
52 words
The control circuit of claim 2 further characterized in that said ignition switch means includes an ignition switch and diode protection means, said diode protection means operably connected in series with said ignition switch to prevent current flow from the charging supply output through the ignition switch means to the vehicle battery.
Claim 7
Dependent Claim
71 words
The control circuit of claim 5 further characterized in that said charging control means includes control SCR means and charging SCR means, said control SCR means being operably connected to monitor the vehicle battery voltage and to control conduction of said charging SCR means, said charging SCR means including a charging SCR operably connected with its anode lead and cathode lead connected between the vehicle battery and the charging supply output.
Claim 8
Dependent Claim
51 words
The control circuit of claim 6 further characterized in that said control SCR means is connected to control the gate lead of said charging SCR, said anode of said charging SCR being connected to the charging supply output, and said cathode being connected to the positive side of the vehicle battery.
References Cited (Backward Citations)
US2972057A
Cited
US3753072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |