Patent ID: 6412129
Filing Date: 2002-07-02
Classification: A61G,F16K

Abstract:
An inflation device comprising:a pump driven electrically to provide compressed air; a rotary valve provided with an inlet, at least two outlets, and a discharge port in communication with atmospheric air, said inlet being in communication with said outlets in an alternate fashion such that the rest of said outlets is in communication with said discharge port at the time when one of said outlets is in communication with said inlet whereby said inlet serves to let in the compressed air from said pump; at least two sets of air sacs in communication with said outlets of said rotary valve such that said two sets of air sacs are kept in the state of periodic and alternate inflation and deflation; and a pressure control unit comprising a fixed electrode member, a pliable electrode member in contact with said fixed electrode member, and a pressure detecting air sac connected with a pipeline between said pump and said rotary valve, said fixed electrode member and said pliable electrode being connected with a power source and a power source input end of said pump such that said pliable electrode member is pushed by said pressure detecting air sac to separate from said fixed electrode member so as to interrupt the power supply to said pump at such time when air pressure value in said pressure detecting air sac exceeds a predetermined value whereby said pliable electrode member comes in contact again with said fixed electrode member so as to resume the power supply to said pump at the time when the air pressure value in said pressure detecting air sac is smaller than the predetermined value.