Patent US6862501B2 successfully refreshed from Google Patents.
US3851184A
Expired / Lapsed
US
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Self-holding unit having a reset delay circuit
Assignee: Ricoh Co Ltd
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Filing: 1973-05-22
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Granted: 1974-11-26
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Expires: 1993-05-22
Abstract
Abstract A self-holding unit having a reset delay circuit is provided, which comprises a first capacitor charged by a reset signal that is applied when restoring or resetting self-held relay contacts. An RC time constant circuit including a second capacitor and a resistor is operative in response to the discharge of the first capacitor to activate a switching element, which operates to energize the reset coil upon lapse of a preset time interval determined by the RC time constant after the application of the reset signal, thereby achieving a time delay in resetting the relay contacts.
Inventors
- 👤 T Ukai
- 👤 K Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6517; G03G15/6523; G03G15/02; G03G15/0275; G03G15/6588; G03G15/6594; G03G15/6597; H; H01; H01H; H01H47/00; H01H47/02; H01H47/18; G03G2215/00; G03G2215/00362; G03G2215/00443; G03G2215/00518
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A self-holding unit having a delay circuit comprising relay means operative upon application of an operation pulse for holding itself in its two setting positions selectively, a first capacitor adapted to be charged by a signal pulse, a resistor and a second capacitor connected in series with the first capacitor to form an RC time constant circuit, and switch means adapted to be rendered conductive when said second capacitor is charged to a predetermined voltage upon discharge said first capacitor for permitting application of the operation pulse from both said capacitors to said relay means for setting said relay means to one of its said positions.
Claim 2
Dependent Claim
106 words
A self-holding unit having a delay circuit comprising relay means operative upon application of an operation pulse for holding itself in its two setting positions selectively, a first capacitor adapted to be charged by a signal pulse, a resistor and a second capacitor connected in series with the first capacitor to form an RC time constant circuit, and switch means adapted to be rendered conductive when said second capacitor is charged to a predetermined voltage upon discharge said first capacitor for permitting application of the operation pulse from both said capacitors to said relay means for setting said relay means to one of its said positions.
Claim 3
Dependent Claim
40 words
A self-holding unit according to claim 1 in which the switching element is constituted by a silicon controlled rectifier which is adapted to be supplied with a firing gate voltage through a constant voltage element having a bidirectional voltage characteristic.
Claim 4
Dependent Claim
39 words
A self-holding unit according to claim 1 further including diode means adapted to permit discharge of said second capacitor therethrough upon the conductive condition of said switch means but normally not to permit charge of said second capacitor therethrough.
References Cited (Backward Citations)
US3154725A
Cited
US3582716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |