Disposable pad Patent #: 3939502
ApplicationNo. 522833 filed on 11/08/1990
US Classes:5/654, Fluent material containing (e.g., air, water, gel)4/456, Cushioned5/655.3Inflatable (e.g., air containing)
ExaminersPrimary: Phillips, Charles E.
Attorney, Agent or Firm
Foreign Patent References
International ClassA47C 020/00
AbstractThis is an improvement in the way to inflate and deflate a doughnut-shape cushion device by doing it automatically. The electronic circuits of the device are activated by a user through a normally open momentary switch. This action turns on an electrical pump to start blowing air to the cushion and at the same time a solenold exhaust valve shuts off. This rubber cushion, attached to the underwear of a person, is inflated to a pressure pre-established in the microcomputer. The pressure sensing element monitors the changes in pressure inside the cushion. As long as the person wearing the cushion is seated, the computer maintains the solenoid exhaust valve closed. Once the person stands up, the pressure inside the cushion drops below the pre-established valve and then the microcomputer output voltage decreases to 0; the exhaust valve opens and consequently the cusion deflates. Later on, the cycle can be repeated by pressing the switch again to initiate the sequence of operations.
Field of SearchCushioned