| 摘要 |
A clutch mechanism for a roller blind, comprises a housing, a drive member journalled for rotation within the housing, a hub portion projecting from the front of the housing, a C-shaped leaf spring, which has in-turned ends, mounted in the hub portion for frictional engagement with the internal wall of the hub portion, a boss rotatable with the drive member and extending within the C-shaped spring so that rotation of the boss by the drive member causes the spring to close slightly thereby reducing the frictional engagement between the spring and the hub, and a driven member rotatably mounted on the hub for operating the roller blind. The driven member has a lug which projects into the space between the ends of the C-shaped spring so that any tendency to rotate the driven member by the weight of a partly lowered blind causes the C-shaped spring to open slightly and increase its frictional engagement with the hub.
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