Patent US3594776A successfully refreshed from Google Patents.
US3594776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual position indicating circuit for switching equipment
Assignee: Siemens AG
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Filing: 1969-11-04
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Granted: 1971-07-20
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Expires: 1989-11-04
Abstract
Abstract In one condition of switching equipment a pair of relays closes a circuit for intermittent energization of a colored pilot lamp. In another condition of switching equipment, the pair of relays closes a circuit for continuous energization of another pilot lamp of a different color.
Inventors
- 👤 Otto Wildgruber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:52
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/16; H01H9/167
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
342 words
A visuAl position indicating circuit for switching equipment, said position indicating circuit comprising a source of DC energizing voltage having a positive polarity terminal and a negative polarity terminal; a first relay having a pair of windings and a first relay switch contact controlled in position by said windings, said first relay switch contact having two closed positions, said first relay having two stable conditions; a second relay having winding means connected in series with said first relay and having a second relay switch contact controlled in position by said winding means, said second relay switch contact having two closed positions; a pilot switch having two closed positions connected between said source of DC energizing voltage and the series-connected first and second relays; a source of intermittent energizing voltage; a source of constant energizing voltage; a first pilot lamp of a first color having a pair of terminals; a second pilot lamp of a second color having a pair of terminals; a common terminal connected in common to a corresponding terminal of each of said first and second lamps; and circuit means connecting the relay switch contact of said first relay and the relay switch contact of said second relay in series between said sources of intermittent and constant energizing voltage and the other terminal of each of said first and second lamps in a manner whereby when the relay switch contact of said first relay is in a first closed position and the relay switch contact of said second relay is in a first closed position said relay switch contacts provide a current path from said source of intermittent energizing voltage to said second pilot lamp thereby intermittently energizing said second pilot lamp and when the relay switch contact of said first relay is in a second closed position and the relay switch contact of said second relay is in a second closed position said relay switch contacts provide a current path from said source of constant energizing voltage to said first pilot lamp thereby continuously energizing said first pilot lamp.
Claim 2
Dependent Claim
342 words
A visuAl position indicating circuit for switching equipment, said position indicating circuit comprising a source of DC energizing voltage having a positive polarity terminal and a negative polarity terminal; a first relay having a pair of windings and a first relay switch contact controlled in position by said windings, said first relay switch contact having two closed positions, said first relay having two stable conditions; a second relay having winding means connected in series with said first relay and having a second relay switch contact controlled in position by said winding means, said second relay switch contact having two closed positions; a pilot switch having two closed positions connected between said source of DC energizing voltage and the series-connected first and second relays; a source of intermittent energizing voltage; a source of constant energizing voltage; a first pilot lamp of a first color having a pair of terminals; a second pilot lamp of a second color having a pair of terminals; a common terminal connected in common to a corresponding terminal of each of said first and second lamps; and circuit means connecting the relay switch contact of said first relay and the relay switch contact of said second relay in series between said sources of intermittent and constant energizing voltage and the other terminal of each of said first and second lamps in a manner whereby when the relay switch contact of said first relay is in a first closed position and the relay switch contact of said second relay is in a first closed position said relay switch contacts provide a current path from said source of intermittent energizing voltage to said second pilot lamp thereby intermittently energizing said second pilot lamp and when the relay switch contact of said first relay is in a second closed position and the relay switch contact of said second relay is in a second closed position said relay switch contacts provide a current path from said source of constant energizing voltage to said first pilot lamp thereby continuously energizing said first pilot lamp.
Claim 3
Dependent Claim
114 words
A position indicating circuit as claimed in claim 1, wherein said pilot switch has a fixed contact connected in common to a corresponding end of each winding of said first relay, and when said pilot switch is in a first closed position it connects said first relay to the negative polarity terminal of said source of DC energizing voltage and when said pilot switch is in a first closed position it connects said second relay to the positive polarity terminal of said source of DC energizing voltage, the other ends of the winding means of said second relay being connected to the negative and positive polarity terminals of said source of DC energizing voltage.
Claim 4
Dependent Claim
117 words
A position indicating circuit as claimed in claim 1, wherein said pilot switch has a fixed contact connected to the positive polarity terminal of said source of DC energizing voltage, and when said pilot switch is in a first closed position it connects said positive polarity terminal to one end of one of the windings of said first relay and when said pilot switch is in a second closed position it connects said positive polarity terminal to a corresponding end of the other of the windings of said first relay, the other ends of the winding means of said second relay being connected in common to the negative polarity terminal of said source of DC energizing voltage.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |