| 摘要 |
A pump assembly includes a cylinder, a piston, a rod, upper and lower end caps, all sharing a common central axis. The cylinder has internal and external surfaces. The piston has a cylindrical exterior surface with an annular groove. An O-ring within the groove is in sliding contact with the internal surface of the cylinder. The rod has a lower end coupled to the piston and an upper end above the cylinder. The lower end cap is over the bottom of the cylinder and the upper end cap is over the top of the cylinder. An aperture in one of the end caps allows air to escape as the piston moves. A handle has a cross piece with a central section attached to the rod. The handle has grips slidably received over end sections. A rigid base has an upper face having a central section. A pivot pin joins the base to the lower end cap for allowing the cylinder to oscillate during use of the system.
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