Air mattress with audible pressure relief valve

An air mattress accommodating air under pressure for providing a body support comprising:

• wall means of flexible air impervious members forming a chamber to accommodate air under pressure, means mounted on said wall means useable to supply air to said chamber, and audible air pressure relief valve means operable to limit the air pressure in said chamber by venting air from said chamber when the pressure of air in said chamber exceeds a selected maximum pressure, said valve means having a tube having an outer end and a passage open to the chamber and atmosphere, an audio means projected into the outer end of the tube for producing a signal when air is vented from said chamber, said audio device comprising a plug member having a generally flat head that engages the outer end of said tube to retain the plug member within the passage, a one way valve located within said passage of the tube inwardly of the audio means, said valve being selectively movable between open and closed positions to allow air to flow through said passage or block the flow of air through said passage, and biasing means within said passage to bias the valve to its closed position, and means mounting the valve means on said wall means.

An audio fluid pressure relief valve comprising:

• a cylindrical tube having a passage, one-way valving member located within said passage movable between open and closed positions to control the flow of fluid through said passage, biasing means engageable with the tube and valving member to bias the valving member to its closed position, an audio means mounted on said tube operable to produce an audio signal when said valving member is in an open position and fluid is flowing through said passage in the tube, said tube having an inner end, an outer end, and an annular flange projected into the passage between said ends, said flange having an annular seat for the valving member, said biasing means operable to bias the valving member into engagement with said seat to close the passage, said audio means comprising a plug member extended into the passage from the outer end thereof, said plug member having a generally flat head engaging the outer end of the tube to retain the plug member wholly within the passage, said plug member having a passage open externally to the valve and the passage of the tube, and vibrating reed means located in said passage of the plug member operable to generate an audible sound when fluid flows through said passages.