Bed having a warming device
 A bed with a cushion having an enclosed space formed in the inner portion, a heating element disposed in the enclosed space for generating warm air and a fan for circulating the warm air within the enclosed space in order to warm up the cushion. The cushion may either be an air cushion or a spring cushion. The cushion includes an air passage formed in the space, with the heating device disposed in the air passage for circulating the warm air in the air passage. The heating element may be a positive-temperature-coefficient thermistor heating element. 
A
A47C
inventional
Chung-Tai
Chang