GB641248A - Improvements in or relating to intermittently operated whistle signal units - Google Patents
Improvements in or relating to intermittently operated whistle signal unitsInfo
- Publication number
- GB641248A GB641248A GB1629447A GB1629447A GB641248A GB 641248 A GB641248 A GB 641248A GB 1629447 A GB1629447 A GB 1629447A GB 1629447 A GB1629447 A GB 1629447A GB 641248 A GB641248 A GB 641248A
- Authority
- GB
- United Kingdom
- Prior art keywords
- whistle
- inlet valve
- close
- pressure
- outlet valve
- 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
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K5/00—Whistles
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Fluid-Driven Valves (AREA)
Abstract
641,248. Audible and like signalling apparatus. SHIELDS, R. (Stangenberg Aktieselskabet, A. S.). June 20, 1947, No. 16294. [Class 118 (ii)] To operate a whistle intermittently compressed air is supplied to a control chamber until the rise in pressure opens an outlet valve to sound the whistle and close an interconnected inlet valve, the subsequent fall in pressure in the chamber allowing said outlet valve to close, and said inlet valve to open again. A whistle is mounted in an aperture 52 of the cover-plate 12 of a compressed air container 10. Air is admitted into a control chamber 18 by the inlet valve 46 until the pressure is sufficient to depress a spring- loaded outlet valve 24 and by a linkage 38 close the inlet valve 46. Air then flows into a whistle chamber 20 and sounds the whistle until the fall in pressure in the control chamber is sufficient to allow the spring 30 to close the outlet valve 24 and so open the inlet valve 46, when the process begins again. By suitable variation of the volume of the chambers and adjustment of the spring tension any desired relation between the duration of a whistle signal and the duration of the subsequent pause may be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1629447A GB641248A (en) | 1947-06-20 | 1947-06-20 | Improvements in or relating to intermittently operated whistle signal units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1629447A GB641248A (en) | 1947-06-20 | 1947-06-20 | Improvements in or relating to intermittently operated whistle signal units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB641248A true GB641248A (en) | 1950-08-09 |
Family
ID=10074726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1629447A Expired GB641248A (en) | 1947-06-20 | 1947-06-20 | Improvements in or relating to intermittently operated whistle signal units |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB641248A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024089596A1 (en) * | 2022-10-25 | 2024-05-02 | CMO S.r.l. | Intermittent pneumatic buzzer |
-
1947
- 1947-06-20 GB GB1629447A patent/GB641248A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024089596A1 (en) * | 2022-10-25 | 2024-05-02 | CMO S.r.l. | Intermittent pneumatic buzzer |
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