US3633196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal lamp monitoring circuit
Assignee: Hasler AG
•
Filing: 1969-11-25
•
Granted: 1972-01-04
•
Expires: 1989-11-25
Abstract
Abstract A circuit for monitoring the readiness for functioning of at least one DC operated signal lamp, the circuit comprising a pulse generator for supplying test pulses through a logic system to a switching transistor; the signal lamp being operated by the switching transistor when a signal voltage is applied to the transistor through the logic system. An indicating circuit is connected to the pulse generator and the transistor to provide a fault indication if a voltage, which does not correspond to the switching state of the transistor determined by the test pulse, occurs on the connection between the lamp and the transistor during each test pulse.
Inventors
- 👤 Erhard Winkler
- 👤 Adrian Allemann
- 👤 Max Oberholzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:31
CPC Classifications
H; H05; H05B; H05B39/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a signal lamp (1), a control transistor (5) having a control input and a switching path connected in series circuit with said signal lamp and direct current source, a control voltage input (E), a pulse generator (20) for generating a stream of test pulses (A), gating means (3) connecting said control voltage input (E) to the control input of said transistor (5) and connected to said pulse generator to receive said test pulses (A) for driving said transistor (5) to its cutoff state with each of said test pulses, sensing means (23) connected to said pulse generator (20) to be actuated by said stream of test pulses and connected to said transistor for response to the no-voltage condition across the switching path of said transistor (5), and indicating means (22, 26) connected to be actuated by said sensing means (23).
Claim 2
Dependent Claim
152 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a signal lamp (1), a control transistor (5) having a control input and a switching path connected in series circuit with said signal lamp and direct current source, a control voltage input (E), a pulse generator (20) for generating a stream of test pulses (A), gating means (3) connecting said control voltage input (E) to the control input of said transistor (5) and connected to said pulse generator to receive said test pulses (A) for driving said transistor (5) to its cutoff state with each of said test pulses, sensing means (23) connected to said pulse generator (20) to be actuated by said stream of test pulses and connected to said transistor for response to the no-voltage condition across the switching path of said transistor (5), and indicating means (22, 26) connected to be actuated by said sensing means (23).
Claim 3
Dependent Claim
40 words
An electric lamp monitoring circuit as set forth in claim 1 in which said pulse generator (20) is adjustable to vary the pulse ratio of said stream of test pulse (A) to adjust the brightness of said signal lamp (1).
Claim 4
Dependent Claim
239 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a signal lamp (1), a control transistor (5) having a control input and a switching path connected in series circuit with said signal lamp and direct current source, a control voltage input (E), a pulse generator (20) operative to deliver a first (A) and a second stream (B) of interleaving pulses, gating means (3, 4) connecting said control voltage input (E) to the control input of said transistor (5) and connected to said pulse generator for control by said first and second pulse streams (A, B) for driving said transistor (5) to its cutoff state with each pulse of said first pulse stream (A) and to its conducting state with each pulse of said second pulse stream (B), first sensing means (23) connected to said pulse generator (20) to be actuated by each pulse of said first pulse stream (A) and connected to said transistor for response to the no-voltage condition across said switching path of said transistor (5), second sensing means (33) connected to said pulse generator (20) to be actuated by each pulse of said second pulse stream (B) and connected to said transistor for response to the presence of a voltage across said switching path of said transistor (5), and first (22, 26) and second (32, 36) indicating means connected to be actuated by said first (23) and said second (33) sensing means respectively.
Claim 5
Dependent Claim
239 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a signal lamp (1), a control transistor (5) having a control input and a switching path connected in series circuit with said signal lamp and direct current source, a control voltage input (E), a pulse generator (20) operative to deliver a first (A) and a second stream (B) of interleaving pulses, gating means (3, 4) connecting said control voltage input (E) to the control input of said transistor (5) and connected to said pulse generator for control by said first and second pulse streams (A, B) for driving said transistor (5) to its cutoff state with each pulse of said first pulse stream (A) and to its conducting state with each pulse of said second pulse stream (B), first sensing means (23) connected to said pulse generator (20) to be actuated by each pulse of said first pulse stream (A) and connected to said transistor for response to the no-voltage condition across said switching path of said transistor (5), second sensing means (33) connected to said pulse generator (20) to be actuated by each pulse of said second pulse stream (B) and connected to said transistor for response to the presence of a voltage across said switching path of said transistor (5), and first (22, 26) and second (32, 36) indicating means connected to be actuated by said first (23) and said second (33) sensing means respectively.
Claim 6
Dependent Claim
222 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a plurality of signal lamps (1, 11), a plurality of control transistors (5, 15) each having a control input and each having a switching path connected in series circuit with a respective one of said plurality of signal lamps (1, 11) and said direct current source (+, 0), a plurality of control voltage inputs (E) each assigned to one of said plurality of signal lamps (1, 11), a pulse generator (20) for generating a stream of test pulses (A), a plurality of gating means (3, 13) each connecting a respective one of said plurality of control voltage inputs (E) to the control input of a respective one of said plurality of control transistors (5, 15) and each of said plurality of gating means connected to said pulse generator to receive said stream of test pulses (A) for driving said transistors to their cutoff state with each of said test pulses, sensing means (23) connected to said pulse generator (20) to be actuated by said stream of test pulses (A) and connected to said plurality of control transistors (5, 15) for reSponse to the no-voltage condition across the switching path of any of said transistors (5, 15), and indicating means (22, 26) connected to be actuated by said sensing means (23).
Claim 7
Dependent Claim
222 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a plurality of signal lamps (1, 11), a plurality of control transistors (5, 15) each having a control input and each having a switching path connected in series circuit with a respective one of said plurality of signal lamps (1, 11) and said direct current source (+, 0), a plurality of control voltage inputs (E) each assigned to one of said plurality of signal lamps (1, 11), a pulse generator (20) for generating a stream of test pulses (A), a plurality of gating means (3, 13) each connecting a respective one of said plurality of control voltage inputs (E) to the control input of a respective one of said plurality of control transistors (5, 15) and each of said plurality of gating means connected to said pulse generator to receive said stream of test pulses (A) for driving said transistors to their cutoff state with each of said test pulses, sensing means (23) connected to said pulse generator (20) to be actuated by said stream of test pulses (A) and connected to said plurality of control transistors (5, 15) for reSponse to the no-voltage condition across the switching path of any of said transistors (5, 15), and indicating means (22, 26) connected to be actuated by said sensing means (23).
Claim 8
Dependent Claim
320 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a plurality of signal lamps (1,11), a plurality of control transistors (5, 15), each having a control input and each having a switching path connected in series circuit with a respective one of said plurality of signal lamps (1, 11) and said direct current source (+, 0), a plurality of control voltage inputs (E) each assigned to one of said plurality of signal lamps (1, 11), a pulse generator (20) operative to deliver a first (A) and a second stream (B) of interleaving pulses, a plurality of gating means (3, 4; 13, 14) each connecting a respective one of said plurality of control voltage inputs (E) to the control input of a respective one of said plurality of control transistors (5, 15) and connected to said pulse generator for control by said first and second pulse streams (A, B) for driving said plurality of transistors (5, 15) to their cutoff state with each pulse of said first pulse stream (A) and to their conducting state with each pulse of said second pulse stream (B), first sensing means (7, 17, 40, 23) connected to said pulse generator (20) to be actuated by each pulse of said first pulse stream (A) and connected to said plurality of control transistors (5, 15) for response to the no-voltage condition across the switching path of any of said transistors (5, 15), second sensing means (8, 18, 33) connected to said pulse generator (20) to be actuated by each pulse of said second pulse stream (B) and connected to said plurality of control transistors (5, 15) for response to the presence of a voltage across the switching path of any of said transistors (5, 15), and first (22, 26) and second (32, 36) indicating means connected to be actuated by said first (7, 17, 40, 23) and second (8, 18, 33) sensing means respectively.
Claim 9
Dependent Claim
320 words
An electric lamp monitoring circuit comprising, a direct current source (+, 0), a plurality of signal lamps (1,11), a plurality of control transistors (5, 15), each having a control input and each having a switching path connected in series circuit with a respective one of said plurality of signal lamps (1, 11) and said direct current source (+, 0), a plurality of control voltage inputs (E) each assigned to one of said plurality of signal lamps (1, 11), a pulse generator (20) operative to deliver a first (A) and a second stream (B) of interleaving pulses, a plurality of gating means (3, 4; 13, 14) each connecting a respective one of said plurality of control voltage inputs (E) to the control input of a respective one of said plurality of control transistors (5, 15) and connected to said pulse generator for control by said first and second pulse streams (A, B) for driving said plurality of transistors (5, 15) to their cutoff state with each pulse of said first pulse stream (A) and to their conducting state with each pulse of said second pulse stream (B), first sensing means (7, 17, 40, 23) connected to said pulse generator (20) to be actuated by each pulse of said first pulse stream (A) and connected to said plurality of control transistors (5, 15) for response to the no-voltage condition across the switching path of any of said transistors (5, 15), second sensing means (8, 18, 33) connected to said pulse generator (20) to be actuated by each pulse of said second pulse stream (B) and connected to said plurality of control transistors (5, 15) for response to the presence of a voltage across the switching path of any of said transistors (5, 15), and first (22, 26) and second (32, 36) indicating means connected to be actuated by said first (7, 17, 40, 23) and second (8, 18, 33) sensing means respectively.
References Cited (Backward Citations)
US3421157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |