Patent ID: 9057364
Filing Date: 2015-06-16
Classification: F04B

Abstract:
1. A bicycle air pump comprising: a cylinder portion including a first end, a second end and a chamber disposed between the first and second ends; an inner piston movably disposed in the chamber of the cylinder portion; a piston rod having a first end and a second end coupled to the inner piston, the piston rod being movable between a retracted position and an extended position with respect to the cylinder portion; a head portion coupled to the cylinder portion, the head portion including an outlet passage communicated with the chamber of the cylinder portion for supplying air to an object to be inflated; a handle coupled to the piston rod to move within the chamber; and a magnetic mechanism including first and second closure members for engaging together magnetically to hold the piston rod stationary with respect to the cylinder portion at the retracted position, the first closure member being attached to the inner piston such that the first closure member is exposed toward the head portion in the chamber of the cylinder portion, the second closure member being attached to the head portion such that the second closure member is exposed toward the inner piston in the chamber of the cylinder portion, the first and second closure members being directly in contact in the chamber of the cylinder portion when the piston rod is located at the retracted position, the second closure member including an air passage through which the outlet passage of the head portion fluidly communicates with the chamber of the cylinder portion, and the air in the chamber of the cylinder portion being discharged to the outlet passage of the head portion through the air passage of the second closure member when the piston rod moves from the extended position to the retracted position with respect to the cylinder portion.