| 摘要 |
A automatic air pump for car wheel tires, especially those without tubes, utilizes an air piston with a cylinder fixed on a rim which enables its piston plate to contact and be pushed by the interior tire surface successively by the wheel rotation compressing air into the tire chamber until the pressure grows sufficient and the piston rod no longer touches the interior tire surface. If a static wheel is also desired to be pumped full of air automatically, a compressor and a pressure-gauge piston can be added. When the tire pressure grows insufficient, the compressor can be started by detaching a metallic plate from two metallic projections caused by the interaction of the piston rod and the interior tire and air is sucked into the cylinder and flows into the tire chamber sufficiently. Then a piston plate of a pressure-gauge piston is lifted up making an electric connection to cut the electricity from the compressor and the piston rod recovers its original position.
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