| 摘要 |
A manual air pump includes an outer cylinder comprising a chamber therein, a head provided to an end of the outer cylinder, the head including an outlet passage communicated with the chamber for supplying air to an object to be inflated, and an inner cylinder reciprocatingly mounted in the outer cylinder. An outer piston is attached to an end of the inner cylinder to move therewith and includes a passage for communicating a longitudinal bore of the inner cylinder with one of the outlet passage of the head and the chamber of the outer cylinder. A piston rod is reciprocatingly mounted in longitudinal bore of the inner cylinder and an inner piston is attached to an end of the piston rod to move therewith. A handle is secured to the other end of the piston rod to move therewith. The inner cylinder is rotatable relative to the outer cylinder. When the inner cylinder is in a first angular position relative to the outer cylinder for high-volume inflation, the inner cylinder is reciprocatingly and longitudinally movable relative to the outer cylinder. When the inner cylinder is in a second angular position relative to the outer cylinder for high-pressure inflation, the inner cylinder is immobile in a longitudinal direction relative to the outer cylinder.
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