Whistle |
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| 申请号 | EP00300273.0 | 申请日 | 2000-01-17 | 公开(公告)号 | EP1020844A3 | 公开(公告)日 | 2004-04-28 |
| 申请人 | J. Hudson & Co. (Whistles) Ltd; | 发明人 | Topman, Simon Manville; Sharp, Michael Colin; | ||||
| 摘要 | A whistle (1), particularly a sports whistle, which is generally in the shape of a mandolin and has two whistle element sound chambers (2,3) arranged side-by-side and each having a cross section which is asymmetrical, preferably part-circular and part square. The sound chambers (2,3) are arranged so that the blowing pressure required to generate a sound pressure level of 90DbA and a maximum frequency of about 3.9KHz is only 0.5 p.s.i. The sound chambers (2,3) are separated from one another at each air vent (4,5) by a fin (F) of generally narrow width, and the entrance to each sound chamber is defined in part by a respective inclined inner wall (10,11) near the central longitudinal axis of the whistle. | ||||||
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