| 摘要 |
A cleaning device includes a first expansion unit in which a first expansion member is received and the first expansion unit is connected to a cylinder which has a piston received therein and the piston defines a first room and a second room in the cylinder. The piston has a first magnetic member which magnetically drives a movable member with a second magnetic member connected thereto. The movable member moves along the cylinder. A cleaning unit is co-movably connected with the movable member. By expansion of the first expansion unit by the sun, the movable member is moved and the cleaning unit is moved along the glass surface. The action consumes no electric power.
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