| 摘要 |
A deck construction includes a movable, rigid, unitary platform with wheels mounted to its bottom and supporting tracks arranged on opposite sides of an open space below the platform. The wheels roll along the tracks, allowing horizontal movement of the platform. At least one drive mechanism is mounted on a side of the open space to engage a rack on the platform. One or more stationary sources of rotary power, such as electric motors, operate the drive mechanism to cause the platform to move horizontally in either direction along the tracks. The deck construction is particularly useful as a swimming pool cover or an extensible balcony or canopy.
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