| 摘要 |
A drum for a roll-up closure, the closure having a door of hinged together slats, one end of the door adapted to be mounted on the drum, the door adapted to be wound on the drum as the drum is rotated. The drum has a wall defining its shape with a depression in the wall extending both inwardly and across the width of the drum. The cross-section of the wall defines an increasing spiral from one side of the depression to the other side of the depression. An extension of the wall extends from the one side of the depression towards the other side to partially close the depression. The partially closed depression is shaped to receive the one end of the door to mount the door on the drum.
|
