A tie-down device includes a frame, a strap, a reeling unit (40), a driving unit and a gear box. The frame includes two walls (24) extending from a base. The reeling unit includes a reel (44) rotationally supported on the walls for reeling the strap. The d...

An automatic extensible telescopic apparatus includes an internal tube inserted in an external tube. A positioning unit includes a ferrule, two fins, an axle, a toothed wheel and a first detent. The ferrule is provided on the external tube. The fins extend...