US3593033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for energizing sequentially plural loads
Assignee: Tokai Rika Co Ltd
•
Filing: 1968-08-27
•
Granted: 1971-07-13
•
Expires: 1988-08-27
Abstract
Abstract A device for energizing sequentially and at a given time interval plural loads, such as an electric lamps relays, or a solenoids and deenergizing simultaneously all loads, at a lapse of a certain time after the final load has been energized, does not use any mechanical switching elements. The device comprises an electric circuit consisting of plural stages connected in parallel to a source of electric potential and each including a load and an SCR connected in series. Each stage includes a pair of series-connected variable resistors connected between the cathode of the SCR of one stage and the gate of the SCR of the next succeeding stage, and a condenser connected between the source and the junction point between the pair of seriesconnected variable resistors.
Inventors
- 👤 Tetsuji Shimizu
- 👤 Sinichi Ueno
- 👤 Susumu Usami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:31
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/725; H05; H05B; H05B47/00; H05B47/10; H05B47/155
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A device for energizing plural loads sequentially comprising, in combination, an electric circuit including plural stages connected in parallel to a source of electric potential, with each stage including a load and an SCR connected in series; each stage including a respective pair of variable resistors interconnected between a cathode of the SCR of the preceding stage and the gate circuit of the SCR of the respective stage; respective condensers, each connected between the source of electric potential and a respective junction point of a respective pair of variable resistors, whereby said plural loads are energized sequentially at predetermined time intervals; and a further SCR connected in parallel with said condensers to complete a discharge circuit therefor, whereby all said loads are deenergized responsive to conduction of said further SCR.
Claim 2
Independent Claim
130 words
A device for energizing plural loads sequentially comprising, in combination, an electric circuit including plural stages connected in parallel to a source of electric potential, with each stage including a load and an SCR connected in series; each stage including a respective pair of variable resistors interconnected between a cathode of the SCR of the preceding stage and the gate circuit of the SCR of the respective stage; respective condensers, each connected between the source of electric potential and a respective junction point of a respective pair of variable resistors, whereby said plural loads are energized sequentially at predetermined time intervals; and a further SCR connected in parallel with said condensers to complete a discharge circuit therefor, whereby all said loads are deenergized responsive to conduction of said further SCR.
Claim 3
Independent Claim
274 words
A device for energizing plural loads sequentially comprising, in combination, an electric circuit including plural stages connected in parallel to a source of electrical potential, with each stage including a load and an SCR connected in series; each stage including a respective pair of variable resistors interconnected between a cathode of the SCR of the preceding stage and the gate circuit of the SCR of the preceding stage and the gate circuit of the SCR of the respective stage; respective condensers, each connected between the source of electric potential and a respective junction point of a respective pair of variable resistors, whereby said plural loads are energized sequentially at predetermined time intervals, said device further comprising a first series circuit including a fist diode, a first resistor and a further condenser, and a second series circuit including a second diode and a further SCR; said first and second series circuits being connected in parallel to the source of electric potential, thereby completing a closed circuit; a further variable resistor connected between the anode of said further SCR and the junction point of said first resistor and said further condenser; respective third diodes each connected in series with a respective one of said first mentioned condensers, the anode of said further SCR being connected to the cathodes of each of said third diodes; and a second resistor connected between the anode of said further SCR and the gate circuit of the SCR of the first stage of said plural circuits; whereby said plural loads are energized sequentially and at a predetermined time interval, and are deenergized simultaneously after all of said loads have been energized.
Claim 4
Independent Claim
274 words
A device for energizing plural loads sequentially comprising, in combination, an electric circuit including plural stages connected in parallel to a source of electrical potential, with each stage including a load and an SCR connected in series; each stage including a respective pair of variable resistors interconnected between a cathode of the SCR of the preceding stage and the gate circuit of the SCR of the preceding stage and the gate circuit of the SCR of the respective stage; respective condensers, each connected between the source of electric potential and a respective junction point of a respective pair of variable resistors, whereby said plural loads are energized sequentially at predetermined time intervals, said device further comprising a first series circuit including a fist diode, a first resistor and a further condenser, and a second series circuit including a second diode and a further SCR; said first and second series circuits being connected in parallel to the source of electric potential, thereby completing a closed circuit; a further variable resistor connected between the anode of said further SCR and the junction point of said first resistor and said further condenser; respective third diodes each connected in series with a respective one of said first mentioned condensers, the anode of said further SCR being connected to the cathodes of each of said third diodes; and a second resistor connected between the anode of said further SCR and the gate circuit of the SCR of the first stage of said plural circuits; whereby said plural loads are energized sequentially and at a predetermined time interval, and are deenergized simultaneously after all of said loads have been energized.
Claim 5
Dependent Claim
112 words
A device for energizing plural loads sequentially, as claimed in claim 2, further comprising a third series circuit including a fourth diode, a third resistor and an additional condenser, and connected in parallel to the potential source; a fourth series circuit including an additional variable resistor, connected in parallel with said additional condenser, a fifth diode and a photoconductive element connected to the gate circuit of the SCR of the first stage of said plural stages; said third and fourth series circuits constituting an illumination reference circuit; said illumination reference circuit automatically initiating and interrupting operation of said device in accordance with the intensity of ambient illumination effective on said photoconductive element.
References Cited (Backward Citations)
US3450901A
Cited
US3456131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |