| 摘要 |
<p>The roller blind, with a tube driven by a spring, has a cam (63) and a braking mechanism between the tube (12) and fixed shaft (20) in place of a centrifugal clutch. The braking mechanism comprises a drum (30) on the fixed shaft, with a spring (31) and a cam sleeve (33) contg. a shaped recess for the cam. - The cam is operated by a relative movement of the sleeve recess. This locks the brake spring when the blind is pulled down and left in a given position and releases when it is pulled to its full extent.</p> |
