Balloon pump

摘要

A balloon pump includes a cylinder having an outlet end and a piston adapted to reciprocate within the cylinder. One-way outlet and inlet valves are associated with the pump for allowing air to exit the cylinder outlet end only when the piston moves toward the outlet end and enter the cylinder only when the piston reciprocates away from the cylinder outlet end. An elongated piston drive member or base is connected at one end to the piston with the other end extending out of the cylinder at the end opposite the cylinder outlet end. A biasing arrangement acts between the cylinder and the piston to bias the piston away from the outlet end of the cylinder. With the pump positioned vertically and supported on the elongated piston drive member, the biasing arrangement raises the cylinder to perform a return stroke so that the pump may be operated simply by pushing down on the cylinder.