| 摘要 |
An overhead door system (310) including a sectional door (D") having top, bottom, and intermediate panels (321, 322, 323, 324) hinged for moving between a closed vertical position and an open horizontal position, top rollers (332) on the top panel, bottom rollers (341) on the bottom panel, intermediate rollers (337) positioned between the top rollers and the bottom rollers, inner vertical tracks (351) for engaging the intermediate rollers, transition tracks (353) commencing at the upper extremity of inner vertical tracks curving through an angle of approximately ninety degrees for directing the travel of the intermediate rollers, horizontal tracks (355) extending from the transition tracks for engaging the intermediate rollers to support the door in the open horizontal position, and outer vertical tracks (357) for guiding the bottom rollers in a substantially vertical path when moving between the open horizontal position and the closed vertical position of the door. |
