Whistle

Details Whistle Whistle

G - Physics

10

K

46/26, 84/44

G10K 5/00 (2006.01)

Patent

CA 1276822

ABSTRACT The invention provides a new whistle, intended for sports referees, and for small boat emergency use, where a loud piercing sound is required without the possibility of loss of sound by "over-blowing" or by sticking of the freely-moving ball used in conventional whistles. The profile of the new whistle preferably is of flat-topped "mandolin" shape in side elevation, so that it is familiar and readily acceptable by established users, and yet includes three separate fipple-type whistle elements in a single whistle body, each with its own air column chamber and vibration-producing knife edge, at least two of which chambers are of slightly different lengths, so as to produce complex harmonics and beats that increase the piercing quality and audibility of the sound. This is done by providing two elements side-by-side and parallel to one another, with the third also parallel and below (or above in an inverted shape) the other two protruding into the space between them. The body is provided with a rearwardly-protruding boss into which the third column extends, so that its knife edge can be set back from the others to retain the desired side profile, and yet it can be the longest of the three. The whistle is made as a three-part moulding, two of which fit within the third, the moulding parts providing different parts of the three element chambers, their knife edges, air-directing passages and the boss, so that all three parts can be moulded without the use of complex moulds and the whistle is complete when the three are assembled together.

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