GB976412A - Improvements in flashing light warning devices - Google Patents
Improvements in flashing light warning devicesInfo
- Publication number
- GB976412A GB976412A GB2044362A GB2044362A GB976412A GB 976412 A GB976412 A GB 976412A GB 2044362 A GB2044362 A GB 2044362A GB 2044362 A GB2044362 A GB 2044362A GB 976412 A GB976412 A GB 976412A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamps
- unit
- light
- transistors
- amplifiers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
- F21V23/0414—Arrangement of electric circuit elements in or on lighting devices the elements being switches specially adapted to be used with portable lighting devices
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
- G08B5/38—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources using flashing light
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
976,412. Controlling lamps photo-electric. BENJAMIN ELECTRIC Ltd., and G. D. SKINNER. Aug. 28, 1963 [May 28, 1962], No. 20443/62. Heading G1A. [Also in Divisions G4 and H3] SKINNER. Aug. 28, A light device comprises a number of associated light sources operated intermittently so that in the event of failure of one lamp, the device continues to operate with a different visual pattern of light. As described, the unit comprises a transistor multivibrator 40, 41, Fig. 4, the output of which is fed via amplifiers 44, 46 and 43, 45 to lamps 17 and 16 respectively. The amplifiers are gated on and off by a bi-stable circuit 50, 51 which is switched from one state to the other by pulses produced at the outputs of the amplifiers. The resulting gated signals have waveforms 16a, 16b, 16c, 17a, 17b, 17c, Fig. 3 which cause the lamps to flash alternatively. Should one lamp fail, the other continues to flash giving a visual signal at half the previous rate. Transistors 58, 59 may be provided in parallel with transistors 41, 42 so that the circuit will continue to operate in the event of a failure of one of these transistors. The unit is housed in a casing provided with a photosensitive element which switches it on when the ambient light falls below a predetermined level, a removable stop being provided for controlling the amount of light falling on the photosensitive element. The two lamps 16, 17 are arranged behind a common filter or lens and the unit is fitted with a switch which is automatically operated when the unit is mounted on a support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2044362A GB976412A (en) | 1962-05-28 | 1962-05-28 | Improvements in flashing light warning devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2044362A GB976412A (en) | 1962-05-28 | 1962-05-28 | Improvements in flashing light warning devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB976412A true GB976412A (en) | 1964-11-25 |
Family
ID=10146037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2044362A Expired GB976412A (en) | 1962-05-28 | 1962-05-28 | Improvements in flashing light warning devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB976412A (en) |
-
1962
- 1962-05-28 GB GB2044362A patent/GB976412A/en not_active Expired
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