Patent ID: 8636481

Claim:
An automatic inflation pump, comprising a housing, an air inlet, an air outlet provided on the housing, an air pump provided inside the housing and a motor for driving the air pump, wherein the automatic inflation pump further comprises a manual rotary switch and a sealing device provided at the air outlet, the manual rotary switch is provided thereon with a dovetail groove having a first groove and two second grooves located at both sides of the first groove, and the first groove has a maximum depth larger than a maximum depth of the second grooves, the sealing device comprises a driving stem and an air sealing plate for sealing the air outlet, one end of the driving stem is connected with the air sealing plate and the other end of the driving stem contacts the dovetail groove, and when the other end of the driving stem is located in the first groove of the dovetail groove, the air sealing plate closes the air outlet; when the other end of the driving stem is located in either second groove of the dovetail groove, the air outlet is opened; a spring is provided on the driving stem, and one end of the spring is fixed on a free end of the driving stem and the other end of the spring is supported at the air outlet; and the manual rotary switch comprises a knob lid and a ventilation cylinder located at a lower end of the knob lid and connected with the knob lid, the ventilation cylinder has a vent hole, and the air inlet is disposed in an upper surface of the knob lid and communicates with the air pump via the vent hole of the ventilation cylinder.