| 摘要 |
In a sunshade device, a roller is journalled in an elongated housing and has a screen wound therearound. The roller is biased to rotate in a screen-winding direction for winding the screen thereon. A drive gear is fixed to the roller. A threaded rod parallel to the roller is fixed in the housing, and has a follower gear sleeved threadedly thereon. The follower gear is formed with grooves arranged around the rod axis and meshing with the drive gear. Each groove has a groove bottom, and first and second groove ends formed respectively at first and second end portions of the follower gear. The groove bottom at the first groove end is displaced from the rod axis by a distance smaller than that of the groove bottom at the second groove end.
|
