| 摘要 |
The vacuum cleaner for smoothly passing over a doorsill higher than floor level, comprises a driving means having dust suction inlet (24), castor (24), driving wheels (28); object passing means having a big-size to other gear (36) engaged with the driving means for passing over the object when meeting with the object in front of body frame (22); body-frame driving means having an endless track (50) combined with transmission of motor (30) for driving the frame (22) when contacting with the object and passing over the object.
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