| 摘要 |
<p>An operating mechanism for an up-and-over door comprises a rotary guide member (16) pivotally mounted at or upon a side of the door (10), a linear trackway (18) positively engaging the rotary guide member (16), and drive means (19) mounted upon the door (10) to rotate the rotary guide member (16) and thereby move it along the trackway (18). In an illustrated embodiment, two rotary guide members in the form of pinions (16) are located at opposite ends of a shaft (15) rotated by an electric motor (19) on the door and engage two linear racks (18).</p> |
