US2074266A - Acoustic warning device - Google Patents
Acoustic warning device Download PDFInfo
- Publication number
- US2074266A US2074266A US685271A US68527133A US2074266A US 2074266 A US2074266 A US 2074266A US 685271 A US685271 A US 685271A US 68527133 A US68527133 A US 68527133A US 2074266 A US2074266 A US 2074266A
- Authority
- US
- United States
- Prior art keywords
- acoustic
- conduit
- casing
- warning device
- diaphragm
- 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 - Lifetime
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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
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
Definitions
- this period of proper plicable not only to warning apparatus having an oscillations may change, for example, under the electromagnetic action, but also to those which influence of atmospheric conditions, such a warnare operated in any other manner, where there is ing apparatus easily gets out oftune by an atmosco-ordinated action of a vibrating diaphragm and .pheric change; similarly, the adjustment of the an amplifying acoustic conduit.
- An acoustic horn comprising a casing, a diaby their reciprocal influence. phragm in said casing, means for vibrating said These defects are eliminated by the provision diaphragm, and an acoustic conduit fastened to of an opening in the commencement of, or at the said casing by means producing an opening which base of, the acoustic air conduit, which opening opens directly into the atmosphere between said communicates with the exterior. casing and said conduit. According to the invention the said opening is 2.
- An acoustic horn comprising a casing, a diaproduced by the means for fastening the acoustic phragm in said casing, means for vibrating said air conduit to the casing of the warning device.
- diaphragm, and an acoustic conduit fastened to Warning devices constructed in accordance but spaced from said casing to provide a ringwith the invention are shown by way of example like opening which opens directly into the atmos in the accompanying drawing, in which:.- phere at the place where the conduit communi- 35 Figure 1 is a longitudinal axial section of'a cates with said casing. warningapparatus. 3.
- An acoustic horn comprising a casing, a dia- Figure 2 is a transverse section of the apparatus phragm in said casing, means for vibrating said O the line AB of Figure 1.
- diaphr an acoustic conduit, and means in- 40
- a eluding, distance pieces for fastening said conduit 40 indicates the diaphragm, which is set in vibration to said casing and spacing it therefrom whereby by means of the armature b of an electromagnet c an annular gap-which opens directly into the atand an interrupter, which is not shown.
- the mosphere is formed between said casing and armature b and the diaphragm ,a are connected by conduit which is interrupted by said distance a pin d. Furthermore, in this construction, a pieces. 45
- the present invention relates to acoustic warning devices, more particularly intended for vehicles, in which the sound is produced by a diaphragm set in rapid vibration and then amplified plate e vibrating in unison with the armature and diaphragm is placed on an extension of the pin it.
Description
March 16,1937. F. KO CH 25 19 ACOUSTIC WARNING DEVICE F'iled Aug; 15, 19:53
v I I I UNITED STATES PATENT OFFICE 7 2,074,266 ACOUSTIC WARNING DEVICE Fritz Koch, St. Ouen-sur-Seine, France, assignor to Robert Bosch Aktiit, Stuttgart, Germany Application August 15, 1933, Serial No. 685,271 In Germany September 30, 1932 3 Claims. (01. 177-7) 5 by an amplifying acoustic conduit such as a horn, electromagnet, is screwed the base of the acoustic .5
trumpet or the like situated in front of this diaconduit 9, distance-pieces I being interposed. In- Phragm. this manner an annular gap sis formed, which is In such warning apparatus sometimes the osinterrupted only by the distance-pieces f, and cillations arising on ,the one hand from the diawhich puts the chamber situated between the phragm and on the other hand from the column diaphragm and the neck of the acoustic conduit g 10 of air in movement in the acoustic conduit recipinto communication with the exterior. rocally influence each other. This takes place This construction has the advantage that the more especially in an undesirable manner when same means are employed both to fasten the the acoustic conduit is of such proportions that acoustic air conduit to the casing of the device and its volume of air assumes a very marked proper or to provide the opening communicating with the natural period of vibration, for example, when its exterior. length and its diameter are in a definite propor- It will be understood that this invention is aption. Owing to the fact that this period of proper plicable not only to warning apparatus having an oscillations may change, for example, under the electromagnetic action, but also to those which influence of atmospheric conditions, such a warnare operated in any other manner, where there is ing apparatus easily gets out oftune by an atmosco-ordinated action of a vibrating diaphragm and .pheric change; similarly, the adjustment of the an amplifying acoustic conduit.
tuning of the diaphragm in relation to the acous- I declare, that what I claim is: tic conduit and inversely is rendered more difiicult 1. An acoustic horn comprising a casing, a diaby their reciprocal influence. phragm in said casing, means for vibrating said These defects are eliminated by the provision diaphragm, and an acoustic conduit fastened to of an opening in the commencement of, or at the said casing by means producing an opening which base of, the acoustic air conduit, which opening opens directly into the atmosphere between said communicates with the exterior. casing and said conduit. According to the invention the said opening is 2. An acoustic horn comprising a casing, a diaproduced by the means for fastening the acoustic phragm in said casing, means for vibrating said air conduit to the casing of the warning device. diaphragm, and an acoustic conduit fastened to Warning devices constructed in accordance but spaced from said casing to provide a ringwith the invention are shown by way of example like opening which opens directly into the atmos in the accompanying drawing, in which:.- phere at the place where the conduit communi- 35 Figure 1 is a longitudinal axial section of'a cates with said casing. warningapparatus. 3. An acoustic horn comprising a casing, a dia- Figure 2 is a transverse section of the apparatus phragm in said casing, means for vibrating said O the line AB of Figure 1. diaphr an acoustic conduit, and means in- 40 In the construction shown in Figs. 1 and 2, a eluding, distance pieces for fastening said conduit 40 indicates the diaphragm, which is set in vibration to said casing and spacing it therefrom whereby by means of the armature b of an electromagnet c an annular gap-which opens directly into the atand an interrupter, which is not shown. The mosphere is formed between said casing and armature b and the diaphragm ,a are connected by conduit which is interrupted by said distance a pin d. Furthermore, in this construction, a pieces. 45
The present invention relates to acoustic warning devices, more particularly intended for vehicles, in which the sound is produced by a diaphragm set in rapid vibration and then amplified plate e vibrating in unison with the armature and diaphragm is placed on an extension of the pin it.
This well-known method renders the sound of the warning device more penetrating.
To the wall p of the warning apparatus which, in relation to the diaphragm, is remote from the FRI'IZ KOCH.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2074266X | 1932-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2074266A true US2074266A (en) | 1937-03-16 |
Family
ID=7983690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US685271A Expired - Lifetime US2074266A (en) | 1932-09-30 | 1933-08-15 | Acoustic warning device |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2074266A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2541944A (en) * | 1946-06-13 | 1951-02-13 | Stromberg Carlson Co | Diaphragm mounting |
-
1933
- 1933-08-15 US US685271A patent/US2074266A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2541944A (en) * | 1946-06-13 | 1951-02-13 | Stromberg Carlson Co | Diaphragm mounting |
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