Abstract: A knob for a cooking vessel is a whistle which gives an audible signal that cooking temperature has been reached, and has a valve slide assembly including a separate leaf spring for shutting off the whistle. Inside and outside knob parts incorporate halves of a resonance chamber which makes the knob extremely simple to mold, assemble, clean, and disassemble. The inner knob is comprised of two parts: a top having a whistle orifice and a base which has two arc segments portions which extend through the lid of a cooking vessel and allow the top to be snapped into place abutting the cooking vessel lid. Because the inner knob is comprised of two parts in this fashion, the central opening in the cooking vessel top can be made small enough so that it will be difficult for a user to catch his or her fingers in the opening when the knob is dissasembled for cleaning. The valve slide rests in guides and is overlaid by a knob cover.

Abstract: A knob for a cooking vessel is a whistle which gives an audible signal that cooking temperature has been reached, and has a valve slide assembly including a separate leaf spring for shutting off the whistle. Supporting inside and outside knob parts incorporate halves of a resonance chamber, which makes the knob extremely simple to mold, assemble, clean, and disassemble. The valve slide rests in guides which make it impossible to assemble incorrectly, and is overlaid by a knob cover. The leaf spring biases the valve slide against the top wall of the resonance chamber so that when the slide valve is closed the passage from the resonance chamber to the ambient air is effectively blocked.

Abstract: A knob for a cooking vessel is a whistle which gives an audible signal that cooking temperature has been reached, and has a valve slide for shutting off the whistle. Supporting inside and outside knob parts incorporate halves of a resonance chamber, which makes the knob extremely simple to mold, assemble, clean, and disassemble. The valve slide rests in guides which make it impossible to assemble incorrectly, and overlaid by a knob cover.