Patent ID: 8858193

Claim:
An air pump installed on a frame of a bicycle, comprising: a cylinder member for pumping and delivering air; a transmission member connected to the cylinder member, the transmission member comprising a shaft and a gear, the shaft having a first end connected to the gear and a second end to the cylinder member for driving the cylinder member; a positioning member connected to the cylinder member, the positioning member comprising a locking ring wrapping around the frame of the bicycle; and a pipe connected to the cylinder member; and wherein the gear and a sprocket not on a roller chain of the bicycle directly engage each other by have their teeth clenched together; the cylinder member comprises a base, a piston shaft, an eccentric crank, a cylinder, an outlet valve, a cover, and a plurality of fastening elements; the base has a first axial hole on a lateral side; the piston shaft and the eccentric crank are axially connected and housed inside the base; a piston is positioned at a top end of the piston shaft; a piston ring is configured around the circumference of the piston; an inlet valve is positioned on a top side of the piston; the eccentric crank is axially connected to a bottom end of the piston shaft, and has a second axial hole corresponding to the first axial hole of the base; the cylinder is joined to the base and has a hollow chamber inside for accommodating the inlet valve, the piston, and the piston ring; a top side of the cylinder is configured with a plurality of outlets; the outlet valve is positioned on the top side of the cylinder; the cover is laid over the outlet valve and joined to the base; the cover is fastened to the base by the plurality of fastening elements; and the cover is configured with at least an outlet connector.