Patent ID: 6945301

Claim:
A telescopic tube assembly for a vertical Venetian blind comprising: a) a telescopic beam having two grooved guide tracks and an opening located between the two grooved guide tracks; b) two guide straps, each of the two guide straps is located in one of the two grooved guide tracks; c) two rows of sliding clamp blocks, each of the two rows of sliding clamp blocks having: i) a plurality of sliding clamp blocks, each of the plurality of sliding clamp blocks having two adjusting holes, a protruded part located on a top thereof and having two cord passages, and a clamping part located on a bottom thereof; ii) a plurality of linking bars, each of the plurality of linking bars being located between two adjacent sliding clamp blocks of the plurality of sliding clamp blocks; iii) two telescopic adjusting rods, one of the two telescopic adjusting rods slidably inserted through each of the two adjusting holes of each of the plurality of sliding clamp blocks; iv) a rotary gearing rod and a helical gear being connected to the clamping part and controlling a rotation of a blade of the vertical Venetian blind connected to each clamping part; d) two pull cords controlling a movement of the plurality of sliding clamp blocks and the plurality of linking bars, one pull cord inserted through each of the two cord passages of each of the plurality of sliding clamp blocks; and e) two linkage actuated members slidable located in the two grooved guide tracks, each of the two linkage actuated members having: i) a movement slot, each clamping part of a predetermined number of the plurality of sliding clamp blocks is slidably inserted into the movement slot; ii) a plurality of pairs of holes located on opposing sides of the movement slot; and iii) an adjustment block having two coupling poles and a retaining hole located between the two coupling poles, a selected clamping part being inserted into each retaining hole, the two poles being inserted into a selected pair of the plurality of pairs of holes.