| 摘要 |
A blind includes tension means in a bottom rail and including an output drum, a storage drum, and two cord reels at both sides all being meshed together in gears, an S-shaped tape spring interconnected the output drum and the storage drum, two lines interconnected a head rail and the bottom rail by passing a sheet of drapery material, a portion of the line being wound on the cord reels, and a trigger mechanism including a push button and a spring biased lock member adapted to move either lockingly engage with both the output drum and the storage drum by pressing the push button or not for winding or unwinding the lines to raise or lower the sheet of drapery material. The sheet of drapery material may stay at any desired position after stopping pressing the push button.
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