Patent ID: 7001156

Claim:
An improved structure of a mini-sized air-inflation device having a motor, a mini-sized button-type air filter, a front mounting seat, a muffling pad, a muffling board seat, an air cylinder mounting, a piston, a cylinder body, an cylinder cover and a pressure gauze, characterized in that: the motor has a sealing mounting seat provided with one or more than one through hole disposed with the air filter, the front mounting seat is locked with a covering cap, and a cylinder seat mounting plate of the motor is also provided with a through hole to lead air into the cylinder body, and the piston within the cylinder body is connected to the main shaft of the motor so that reciprocation movement is obtained, the piston is provided with an air-inlet hole and the top of the air-inlet hole is provided with an air-sealing pad, and an air discharge hole is provided within the interior of a through slot of the cylinder cover and the top face of the air discharge hole is also provided with a sealing pad, thereby when the reciprocating movement is initiated, an inflation is obtained and the motor and the cylinder body are provided with cooling air, wherein the air filter is positioned within the through hole of the sealing mounting seat for leading air from the outside for dissipation, the air filter includes a top cover and a cup body and the face of the top cover is provided with air holes and the outer circumferential edge is provided with a water sealing edge and the cup body is provided with an insertion section and an air communication slot for filling of air filtering material.