| 摘要 |
<p>The base or tracker has a rectangular or square plate (1) drilled with a hole at its center. The plate is provided with ball bearings positioned horizontally in order to maintain perfect centering of the plate around a fixed central mast (3). A rack with bent U section is installed on the bearings to assure physical link between a fixed base and a pinion (8) fitted into the rack. A damper (13) covering a motor or pinion assembly on the rack absorbs rotational defects, and secures a person. (Incomplete specification, abstract based on available information published by the patent office).</p> |
