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 Title: |
US4429656:
Toroidal shaped closed chamber whistle
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Weisenberger, Richard J.; Erlanger, KY 41018
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| Assignee: |
None
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| Published / Filed: |
1984-02-07
/ 1982-02-01
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| Application Number: |
US1982000344364
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| IPC Code: |
Advanced:
G10K 5/00;
Core:
more...
IPC-7:
B06B 1/18;
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| U.S. Class: |
Current:
116/137.R;
116/DIG.019;
Original:
116/137.R;
116/DIG.19;
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| Field of Search: |
116/137 R,137 A,DIG. 19
340/406
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| Priority Number: |
| 1982-02-01 |
US1982000344364 |
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| Abstract: |
A toroidal shaped closed chamber whistle produces a warning signal capable of being easily heard at relatively great distances from the whistle. The toroidal whistle emits a bidirectional sound which is phase-locked to a particular pitch. The toroidal whistle has a circular plate positioned within a hollow cylinder to form an air passage leading to an annular air slit. Incoming air under pressure flows through the air passage and out of the annular air slit into a toroidal chamber. Within the toroidal chamber, a sound wave is formed which passes out of the toroidal chamber through a chamber mouth. Optionally, two toroidal chambers can be used in combination to produce a dual-tone sound. Additionally, a tremulant device can be used to produce a warbling effect in the emitted sound.
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| Attorney, Agent or Firm: |
Frost & Jacobs ;
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| Primary / Asst. Examiners: |
Stephan, Steven L.; Corr, Denis E.
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| Family: |
None
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First Claim:
Show all 27 claims |
What is claimed is:
1. A single-tone toroidal whistle for producing a directional output comprising:
- (a) a hollow cylinder having a closed continuous bottom end and having an open top end;
- (b) the bottom end of said cylinder having a central aperture for the passage of air under pressure into the hollow portion of said hollow cylinder;
- (c) a circular plate positioned within said hollow cylinder parallel to the bottom end of said hollow cylinder to form an air passage between said circular plate and the bottom end of said hollow cylinder, said circular plate positioned within said hollow cylinder to form an annular air slit between said circular plate and the inner wall of said hollow cylinder;
- (d) a torus positioned on top of said circular plate, said torus having an interior cavity;
- (e) a circular cover affixed to the top of said torus;
- (f) a lip descending perpendicularly from said circular cover, said lip being tapered to form a point on said lip above said inner wall of said hollow cylinder;
- (g) said torus, said lip, and said circular cover together forming between them a chamber, air under pressure from said annular air slit being adapted to pass to form a sound wave within said chamber, said chamber having a width in a 1 to 3 ratio to the length of said chamber, the outer diameter of said chamber being about 0.625 times the fundamental wavelength of said sound wave.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 2 U.S. patent(s) that reference this one
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