EP 1020844 A2 20000719 - Whistle
Title (en)
Whistle
Title (de)
Pfeife
Title (fr)
Sifflet
Publication
Application
Priority
GB 9900868 A 19990116
Abstract (en)
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. <IMAGE>
IPC 1-7
IPC 8 full level
G10K 5/00 (2006.01)
CPC (source: EP)
G10K 5/00 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 00300273 A 20000117