Liftable scaffold
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 1, 2012
Grant Date -
Jul 16, 2009
app pub date -
Jan 15, 2008
filing date -
Jan 15, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A system for lifting a platform includes a frame attached to the platform. The invention has at least one upright member having equally spaced holes longitudinally aligned, with each of the holes having an upper surface and a lower surface. A motor is attached to the frame, and a pinion is driven by the motor. The frame carries the motor and pinion. The pinion has a plurality of equally spaced teeth that radially extend from the pinion. Each tooth has a roller that is freely rotatable about its axis. The rollers roll over the lower surface of the holes when the motor rotates the pinion in a direction to raise or lower the frame and platform. A safety dog is attached to the frame to prevent the platform from falling if a motor were to fail.
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