Inflation device capable of periodic inflation and deflation

Details Inflation device capable of periodic inflation and deflation Inflation device capable of periodic inflation and deflation

2000-09-18

2002-07-02

Grosz, Alexander (Department: 3628)

Beds

Mattress

Having confined gas

C005S710000

Reexamination Certificate

active

06412129

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to an inflation device, and more particularly to an inflation device capable of inflating and deflating periodically.
BACKGROUND OF THE INVENTION
The U.S. Pat. No. 5,117,518 discloses an inflatable mattress which comprises a pump, a rotary valve, and two sets of mattress air sacs. The compressed air is alternately sent from the pump to the mattress air sacs via the rotary valve. The air pressure of the mattress air sacs is controlled by two sensor air sacs, which are connected with the mattress air sacs. Whenever the air pressure of the mattress air sacs is excessively high, a deflation valve is triggered by the sensor air sacs to deflate the mattress air sacs. Such a prior art disclosure as described above is defective in design in that the pump must be kept constantly in operation, thereby resulting in an additional cost for electric consumption as well as a reduction in service life span of the inflatable mattress.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an inflation device capable of temporary interruption of power supply to the inflation device at such time when the air pressure of the air sac is excessively high.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by the inflation device comprising a pump, a rotary valve, two sets of air sacs, and a pressure control unit. The pump is used to provide compressed air. The rotary valve has one inlet in communication with the pump, and two outlets which are connected with the two sets of air sacs so as to enable the air sacs to be inflated and deflated periodically and alternately. The pressure control unit comprises a fixed electrode member, a pliable electrode member, and a pressure detecting air sac. The fixed electrode member and the pliable electrode members are respectively connected to a power source and the pump. The pressure detecting air sac is connected with a pipeline between the rotary valve and the pump. When the pressure of the pipeline is greater than a predetermined value, the pliable electrode member is pushed by the pressure detecting air sac to separate from the fixed electrode member, thereby resulting in an interruption of power supply to the pump. When the pressure of the pipeline is smaller than the predetermined value, the pliable electrode member resumes in contact with the fixed electrode member so as to resume the power supply to the pump.


REFERENCES:
patent: 5117518 (1992-06-01), Schild
patent: 5189742 (1993-03-01), Schild
patent: 5676639 (1997-10-01), Schild

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