Patent ID: 7568500

Claim:
A co-axial pressure relief device for an air inflator, the co-axial pressure relief device at least comprising a pressure relief control ring, a pipe connector, a seal member, a check valve mounting ring, a check valve, an air inlet hole, a stop ball and an air cell connector, wherein the pressure relief control ring is jammed with the pipe connector, a rear end of the pipe connector passes through the seal member, and the check valve is mounted into the check valve mounting ring and screwed to the air cell connector, a front section of the air cell connector is formed with the air inlet hole, in which the stop ball is disposed, the pressure relief device is formed by threads of an inner side of the pressure relief control ring and the front section of the air cell connector, which are rotated relative to and fit with each other, and wherein: controlling and rotating in the pressure relief control ring enables the check valve mounting ring and the pipe connector to combine together tightly to inflate the air inflator, and controlling and rotating out the pressure relief control ring enables gas in the air inflator to be deflated out of a gap between the check valve mounting ring and the pipe connector, such that a co-axial inflating and pressure relief mechanism is formed.