| 摘要 |
A polygonal drum for controlling blind slats is pivotally connected with a control bar in a blind tilt mechanism for adjusting the angle of the blind slats or controlling opening/closing the blind slats. The polygonal drum includes an elongated equilateral polygonal drum body having multiple plane sidewalls with equal area. The plane sidewalls form the periphery of the elongated equilateral polygonal drum body for winding/unwinding a ladder string by equal length. Accordingly, the blind slats can be easily stably operated and adjusted without obstacle. The polygonal drum further includes multiple reinforcement ribs perpendicularly extending from inner faces of the plane sidewalls to integrally connect with a control bar passage. The reinforcement ribs serve to increase the strength of the polygonal drum so as to overcome the problem of deformation of the conventional control drum. |
