Patent ID: 7992513

Claim:
A whistle, comprising: a body, having a resonance chamber wall and a resonance chamber formed by the resonance chamber wall, the resonance chamber having one open face, the resonance chamber wall being formed with a protrusion or a depression; and a side plate formed separately from the body, and can be attached to and removed from the body, the side plate having a first portion that blocks the one face of the resonance chamber when the side plate is attached to the body, and a first flange provided on the first portion, the first flange having a depression or a protrusion that is engageable with the protrusion or depression of the resonance chamber wall and that causes a latching of the first flange to the resonance chamber wall, wherein at least one of the resonance chamber wall and the first flange is elastically deformable, an air passageway, the resonance chamber, an air opening which is opened in the air passageway, and a sound-emitting opening which is opened in the resonance chamber, are formed by means of the body and the side plate, and the resonance chamber wall has, at an end portion on the side of the one face of the resonance chamber, a flange seat portion thinner than other portions of the resonance chamber wall, and the protrusion or depression of the resonance chamber wall is provided on the flange seat portion.