US4437428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for generating sound waves at relatively high frequencies
Assignee: Individual
•
Filing: 1982-03-19
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Granted: 1984-03-20
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Expires: 2002-03-19
Abstract
Abstract A device for generating warning signals consisting of sound waves at frequencies between 14 and 26 kHz, preferably intended to be mounted on a motor vehicle so that the device will be actuated by the wind. The device operates similar to a flue pipe and generates a subatmospheric pressure behind the sharp edge of the flue pipe. The subatmospheric pressure is created by a passage continuing to a resonant chamber, open at its rear end, the passage being larger in cross-section than the resonant chamber. The passage is formed in a body which has substantially the shape of a frustum of a cone and is formed with longitudinal through slots which extend from the passage. With this design, a subatmospheric pressure is generated which excites the pipe to vibrate even in a relatively slow wind.
Inventors
- 👤 Volkwin Hoffelner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:17
CPC Classifications
A; A01; A01M; A01M29/00; A01M29/16; A01M29/18; B; B60; B60Q; B60Q5/00; G; G10; G10K; G10K5/00; G10K5/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A device for generating sound waves for use with a motor vehicle, said device comprising: a frustoconical body; means for mounting said body on said motor vehicle; and a flue pipe within said body adapted for channelling an air stream to generate sound waves, said flue pipe comprising: an inlet funnel for initially receiving said air stream; a blowing passage for receiving air from said inlet funnel; a resonant chamber for receiving air from said blowing passage; a sharp edge in said resonant chamber for interrupting the flow of said air stream; a horn for receiving air from said resonant chamber for producing sound waves; and a passage for receiving air from said resonant chamber, said passage being larger in cross-section than said resonant chamber.
Claim 2
Independent Claim
125 words
A device for generating sound waves for use with a motor vehicle, said device comprising: a frustoconical body; means for mounting said body on said motor vehicle; and a flue pipe within said body adapted for channelling an air stream to generate sound waves, said flue pipe comprising: an inlet funnel for initially receiving said air stream; a blowing passage for receiving air from said inlet funnel; a resonant chamber for receiving air from said blowing passage; a sharp edge in said resonant chamber for interrupting the flow of said air stream; a horn for receiving air from said resonant chamber for producing sound waves; and a passage for receiving air from said resonant chamber, said passage being larger in cross-section than said resonant chamber.
Claim 3
Dependent Claim
17 words
A device as claimed in claim 1, wherein said passage contains longitudinal slots extending through said body.
Claim 4
Dependent Claim
21 words
A device as claimed in claim 1, wherein said generated sound waves are in the frequency of 14 to 26 kHz.
Claim 5
Dependent Claim
20 words
A device as claimed in claim 1, wherein said horn extends in a generally perpendicular direction from said resonant chamber.
Claim 6
Dependent Claim
33 words
A device as claimed in claim 4, wherein said horn extends through said body and an apron extends from said body adapted for blocking oncoming air from entering a mouth of said horn.
Claim 7
Dependent Claim
32 words
A device as claimed in claim 5, wherein said means for mounting comprises a bracket with a beveled surface adapted for deflecting the sound waves emitted from said mouth of said opening.
Claim 8
Dependent Claim
42 words
A device as claimed in claim 5, wherein said means for mounting comprises a bracket with an arm adapted for carrying said body, said arm containing a rectangular window adapted for deflecting the sound waves emitted from said mouth of said horn.
Claim 9
Dependent Claim
47 words
A device as claimed in claim 5, wherein said means for mounting comprises a bracket with a beveled surface and an arm with a rectangular window, said beveled surface and said rectangular window are adapted for deflecting the sound waves emitted from said mouth of said horn.
Claim 10
Dependent Claim
17 words
A device as claimed in claim 1, wherein said body forms a unit in a torpedo shape.
References Cited (Backward Citations)
US1540023A
Cited
US2570081A
Cited
US2678625A
Cited
US3103911A
Cited
US3186999A
Cited
US3156212A
Cited
CH560617A5
Cited
US4150637A
Cited
FR2394090A1
Cited
US4215646A
Cited
US4215646B1
Cited
US4252076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |