GB448786A - Improvements relating to electrically operated horns - Google Patents
Improvements relating to electrically operated hornsInfo
- Publication number
- GB448786A GB448786A GB3578734A GB3578734A GB448786A GB 448786 A GB448786 A GB 448786A GB 3578734 A GB3578734 A GB 3578734A GB 3578734 A GB3578734 A GB 3578734A GB 448786 A GB448786 A GB 448786A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- operated
- switch
- circuit
- resistance
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Keying Circuit Devices (AREA)
Abstract
448,786. Audible signalling-apparatus. LUCAS, Ltd., J., and HARRIS, T. A., Great King Street, Birmingham. Dec. 13, 1934, No. 35787. [Class 118 (ii)] A circuit fo: enabling one o: more horns to be sounded loudly o: softly comprises a two-position hand switch and an elec tromagnetically operated switch which normally short - circuits a resistance, the elec tromagnetically operated switch being operated to switch the resistance into the horn circuit when the hand switch is operated to the soft position. The electromagnetically operated switch has a slight delay to allow the full current to pass initially to the horn mechanism. As shown in Fig. 1, when the hand switch a is moved to make contacts l the current passes to the horns over contacts d, e, but when contacts s are closed relay g opens contacts d, e and the resistance c is included in the horn circuit. In the embodiment shown in Fig. 4, the horn circuit is always closed by magnet armature j. When the loud contacts l are operated, winding i is energized and armature j makes contacts m, k to close the horn circuit. When the soft contacts s are closed, however, winding g attracts armature so that contacts m, k are closed and contacts d, e opened to bring resistance c into circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3578734A GB448786A (en) | 1934-12-13 | 1934-12-13 | Improvements relating to electrically operated horns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3578734A GB448786A (en) | 1934-12-13 | 1934-12-13 | Improvements relating to electrically operated horns |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB448786A true GB448786A (en) | 1936-06-15 |
Family
ID=10381546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3578734A Expired GB448786A (en) | 1934-12-13 | 1934-12-13 | Improvements relating to electrically operated horns |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB448786A (en) |
-
1934
- 1934-12-13 GB GB3578734A patent/GB448786A/en not_active Expired
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