Patent ID: 8033797

Claim:
A pump with an automatic deactivation mechanism comprising: a motor for inflation of an air bladder by pumping air through an air valve, wherein the motor may also deflate the air bladder; an impeller driven by the motor for moving the air; a casing for retention of the motor and the impeller and through which is connected the air valve, the casing containing an amount of air and with respect to the air inside of the casing, a first aperture defined through the casing providing fluid communication for said air inside the casing with the atmosphere, and a second aperture defined through the casing providing fluid communication for said air inside the casing with the air inside the bladder; an automatic deactivation mechanism comprising: a housing having defined therethrough a third aperture in fluid communication with the first aperture and a fourth aperture in fluid communication with the second aperture; at least two switches comprising a deflation switch and an inflation switch, the deflation switch being positioned at a first end of the housing proximate the fourth aperture and the inflation switch being positioned at a second end of the housing proximate the third aperture; a diaphragm positioned between the switches, wherein the diaphragm is concave and has a diameter and a width, the housing being sealed so that when a threshold pressure is reached therein, at least one of the at least two switches is triggered by deflection of the diaphragm to automatically deactivate the pump by de-energizing the motor; wherein the diaphragm is deflected alternately between the two switches to effect deactivation of the pump when the bladder is fully inflated or deflated to the threshold pressure; a first cover positioned between the deflation switch and the diaphragm within the housing; a second cover positioned between the inflation switch and the diaphragm within the housing; and wherein the length of each of the first and second covers is at least as long as the width of the diaphragm.