GB695655A - - Google Patents
Info
- Publication number
- GB695655A GB695655A GB695655DA GB695655A GB 695655 A GB695655 A GB 695655A GB 695655D A GB695655D A GB 695655DA GB 695655 A GB695655 A GB 695655A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- contact
- armature
- lamp
- contacts
- 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.)
- Active
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- Emergency Alarm Devices (AREA)
Abstract
695,655. Detecting approach of overtaking vehicles. BRITISH THOMSON-HOUSTON'CO., Ltd. March 21, 1951 [March 28, 1950], No. 6769/51. Class 118 (ii). In warning devices for detecting approach of overtaking vehicles of the type wherein a relay 6 operates contacts 7 to give an alarm when a warning sound signal e.g., a hooter signal, is received a further relay 10 in series with the contents of armature 7 and a main switch 11 has an armature 12 with double contacts 13, 14 arranged to produce "winking" of the alarm device 9, e.g. a lamp. The contact 13 is normally made, but when the contacts of armature 7 are closed the relay 10 opens contact 13 and closes contact 14 to short-circuit a resistance 15 in series with the lamp 9 which thereon brightens. The opening of contact 13 causes relay 10 to release and repeat the cycle. The steady feeble glow of lamp 9 when relay 6 is not energized serves to indicate to the driver that the system is switched on. Fig. 1 (not shown) illustrates a receiver circuit that may be used in combination with the invention and comprises a microphone, band-pass filter, rectifier and alarm relay.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB695655A true GB695655A (en) |
Family
ID=1750686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB695655D Active GB695655A (en) |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB695655A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3182288A (en) * | 1961-09-12 | 1965-05-04 | Harvey G Smith | Electronic warning device |
| US3412378A (en) * | 1962-04-27 | 1968-11-19 | James R. Thomas | Electronic warning device |
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0
- GB GB695655D patent/GB695655A/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3182288A (en) * | 1961-09-12 | 1965-05-04 | Harvey G Smith | Electronic warning device |
| US3412378A (en) * | 1962-04-27 | 1968-11-19 | James R. Thomas | Electronic warning device |
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