US3623154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flasher circuit for vehicles
Assignee: Denso Corp
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Filing: 1968-08-07
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Granted: 1971-11-23
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Expires: 1988-08-07
Abstract
Abstract A flasher for vehicles, wherein detection of current is effected by the steady state current of load lamps such as turn signal lamps so that said apparatus may be capable of detecting a burnout of the turn signal lamps when used as a turn signal flasher and capable of flashing the front and rear or left and right turn signal lamps in a stable manner at an adequate frequency when used as a hazard warning flasher.
Inventors
- 👤 Hisashi Yonezu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:16
CPC Classifications
B; B60; B60Q; B60Q11/00; B60Q11/005; B60Q1/00; B60Q1/26; B60Q1/34; B60Q1/38; B60Q1/381
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
446 words
A flasher circuit for vehicles comprising: a lamp load, a source terminal adapted to be connected to a power source, an output terminal connected to said lamp load, an intermittent circuit, including first switch means having a switch output, for periodically switching said first switch means between a first condition in which said switch output is at a first voltage and a second condition in which said switch output is at a second voltage, means for connecting said first switch means to said source terminal and to ground, a relay including a voltage coil connected at one end to said switch output of said first switch means so that a forward current from said power source flows through said voltage coil when said first switch means is in said first condition and accordingly said switch output is at said first voltage and a reverse current flows through said voltage coil when said first switch means is in said second condition and accordingly said switch output is at said second voltage, a current coil connected at one end to the other end of said voltage coil and at the other end to said output terminal and second switch means controlled by said voltage and current coils for switching between an open and closed condition and connected between said source terminal and said one end of said current coil, said current coil and second switch means being connected in series between said source terminal and said output terminal for carrying a load current from said power source to said lamp load, said current coil being connected to said voltage coil and said second switch means so that the voltage at said other end of said voltage coil is less than said first voltage when said second switch means is in said open condition and said first switch means is in said first condition so that said forward current flows through said voltage coil and to said output terminal via said current coil and so that the voltage at said other end of said voltage coil is greater than said second voltage when said second switch means is in said closed condition and said first switch means is in said second condition so that said reverse current flows through said voltage coil, said second switch means being closed by the flow of forward current through said voltage coil and being held in said closed condition thereafter by the flow of said load current through said current coil and said second switch means when said second switch means is in said closed condition, said second switch means being further opened by the flow of reverse current through said voltage coil.
Claim 2
Dependent Claim
446 words
A flasher circuit for vehicles comprising: a lamp load, a source terminal adapted to be connected to a power source, an output terminal connected to said lamp load, an intermittent circuit, including first switch means having a switch output, for periodically switching said first switch means between a first condition in which said switch output is at a first voltage and a second condition in which said switch output is at a second voltage, means for connecting said first switch means to said source terminal and to ground, a relay including a voltage coil connected at one end to said switch output of said first switch means so that a forward current from said power source flows through said voltage coil when said first switch means is in said first condition and accordingly said switch output is at said first voltage and a reverse current flows through said voltage coil when said first switch means is in said second condition and accordingly said switch output is at said second voltage, a current coil connected at one end to the other end of said voltage coil and at the other end to said output terminal and second switch means controlled by said voltage and current coils for switching between an open and closed condition and connected between said source terminal and said one end of said current coil, said current coil and second switch means being connected in series between said source terminal and said output terminal for carrying a load current from said power source to said lamp load, said current coil being connected to said voltage coil and said second switch means so that the voltage at said other end of said voltage coil is less than said first voltage when said second switch means is in said open condition and said first switch means is in said first condition so that said forward current flows through said voltage coil and to said output terminal via said current coil and so that the voltage at said other end of said voltage coil is greater than said second voltage when said second switch means is in said closed condition and said first switch means is in said second condition so that said reverse current flows through said voltage coil, said second switch means being closed by the flow of forward current through said voltage coil and being held in said closed condition thereafter by the flow of said load current through said current coil and said second switch means when said second switch means is in said closed condition, said second switch means being further opened by the flow of reverse current through said voltage coil.
Claim 3
Dependent Claim
44 words
A flasher for vehicles according to claim 1 wherein said current coil is arranged such that said second switch means is held in said closed condition by force of said current coil only when said load current is not less than a predetermined value.
Claim 4
Dependent Claim
52 words
A flasher for vehicles according to claim 1, wherein said voltage coil is connected in parallel with said second switch means in the first condition of said first switch means and connected between said sourse terminal and ground through said first switch means in the second condition of said first switch means.
Claim 5
Dependent Claim
53 words
A flasher for vehicles according to claim 1 wherein said voltage coil is fixedly connected in parallel with said second switch means through a resistance and connected between said source terminal and ground through said second switch means and said first switch means when said first switch means is in said second condition.
Claim 6
Dependent Claim
21 words
A flasher for vehicles according to claim 4, wherein said intermittent circuit and said first switch means comprise a transistorized circuit.
Claim 7
Dependent Claim
52 words
A flasher for vehicles according to claim 5, wherein said transistorized circuit includes two transistors, the base of the one transistor being directly connected with the collector of the other transistor, the base of which is connected with the junctiOn of said current coil and said second switch means through a capacitor.
Claim 8
Dependent Claim
48 words
A flasher for vehicles according to claim 1, wherein said voltage coil is connected in parallel with said second switch means when said first switch means is in said first condition and the junction of said voltage coil and said first switch means is fixedly connected with ground.
Claim 9
Dependent Claim
21 words
A flasher for vehicles according to claim 7, wherein said intermittent circuit and said first switch means comprise a transistorized circuit.
Claim 10
Dependent Claim
74 words
A flasher for vehicles according to claim 1, further comprising a turn signal switch, and a hazard warning switch which are both connected between said output terminal and said lamp load, and said lamp load including two groups of lamps, said output terminal being selectively connected to either one of said two groups of lamps through said turn signal switch and being connectable to both said two groups simultaneously through said hazard warning switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |