| 摘要 |
A door opener system for opening and closing a door relative to a structure includes a rack gear that is hinged on one end to the structure. The door opener system also includes a pinion drive mechanism that is fixed to the door. The door opener system further includes a pinion gear that is engaged with the rack gear and that is rotationally driven by the pinion drive mechanism. In addition, the door opener system includes a retention assembly supporting at least one guide bearing that is engaged with the rack gear. Additional embodiments are disclosed.
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