US3659183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarity control system
Assignee: AVIS INDUSTRIAL Corp
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Filing: 1970-12-04
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Granted: 1972-04-25
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Expires: 1990-12-04
Abstract
Abstract A system for controlling the transmission of electrical power between a D.C. power source and a load. The system includes a circuit having indicator lamps for visually indicating the polarity of the power source and of the load. Relays are utilized to prevent power transmission when the source and the load are improperly connected to the circuit. The circuit includes normally closed contacts of one relay in series with the coil thereof and a resistor in parallel with the normally closed contacts so that when the coil is energized, the voltage applied to the coil is automatically reduced during operation.
Inventors
- 👤 Arthur E Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:49
CPC Classifications
H; H02; H02H; H02H11/00; H02H11/002; Y; Y10; Y10S; Y10S320/00; Y10S320/18; Y10S320/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
375 words
A circuit for controlling the of electrical energy from a D.C. power source to an electrical load comprising, in combination: an input port adapted for electrical connection to said D.C. power source having a first input terminal and a second input terminal; an output port adapted for electrical connection to said load, having a first output terminal and a second output terminal; a first relay having a relay coil in series with a first diode, said series connected first relay coil and first diode being connected across said input port between said first input terminal and said second input terminal, said first diode being poled to conduct current only from said first input terminal to said second input terminal, said first relay also having a pair of normally open contacts connected between said first input terminal and said first output terminal; a second relay having a coil connected in series with a second diode, said series connected coil of said second relay and said second diode being connected in parallel across said output part between said first output terminal and said second output terminal, said second diode being poled to conduct current only from said first output terminal toward said second output terminal, said second relay also having a first pair of normally open contacts in series with the coil of said first relay, and a second pair of normally closed contacts connected in series with the coil of said second relay; and at least one resistor connected in parallel across the second pair of normally closed contacts of said second relay such that when said load and said D.C. power source are correctly connected to said circuit, the coil of said second relay is energized and said second pair of normally closed contacts in series with said coil of said second relay open to reduce the voltage applied to the coil of said second relay and the pair of normally open contacts of said second relay are closed to allow flow of current through the coil of said first relay to thereby energize the coil of said first relay and close the normally open contacts of said first relay connected between said first input terminAl and said first output terminal for conducting power therethrough.
Claim 2
Dependent Claim
375 words
A circuit for controlling the of electrical energy from a D.C. power source to an electrical load comprising, in combination: an input port adapted for electrical connection to said D.C. power source having a first input terminal and a second input terminal; an output port adapted for electrical connection to said load, having a first output terminal and a second output terminal; a first relay having a relay coil in series with a first diode, said series connected first relay coil and first diode being connected across said input port between said first input terminal and said second input terminal, said first diode being poled to conduct current only from said first input terminal to said second input terminal, said first relay also having a pair of normally open contacts connected between said first input terminal and said first output terminal; a second relay having a coil connected in series with a second diode, said series connected coil of said second relay and said second diode being connected in parallel across said output part between said first output terminal and said second output terminal, said second diode being poled to conduct current only from said first output terminal toward said second output terminal, said second relay also having a first pair of normally open contacts in series with the coil of said first relay, and a second pair of normally closed contacts connected in series with the coil of said second relay; and at least one resistor connected in parallel across the second pair of normally closed contacts of said second relay such that when said load and said D.C. power source are correctly connected to said circuit, the coil of said second relay is energized and said second pair of normally closed contacts in series with said coil of said second relay open to reduce the voltage applied to the coil of said second relay and the pair of normally open contacts of said second relay are closed to allow flow of current through the coil of said first relay to thereby energize the coil of said first relay and close the normally open contacts of said first relay connected between said first input terminAl and said first output terminal for conducting power therethrough.
Claim 3
Dependent Claim
27 words
The circuit as set forth in claim 1 including means for indicating the polarity of said power source when said source is connected across said input port.
Claim 4
Dependent Claim
26 words
The circuit as set forth in claim 1 including means for indicating the polarity of said load when said load is connected to said output port.
Claim 5
Dependent Claim
37 words
A circuit as set forth in claim 1 including manually operable means for circumventing the coil of said second relay such that power may be conducted to said load when said load has no detectable voltage thereacross.
Claim 6
Dependent Claim
31 words
The circuit as set forth in claim 1 including a switch biased to prevent conducting the transmission of power from said source to said load until said biased switch is actuated.
Claim 7
Dependent Claim
26 words
The combination as set forth in claim 5 including a toggle switch for conducting power between said source and said load when said switch is actuated.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |