Telescopic rod for advertisement support

摘要

The rod has mutually adjustable tubes, arrestable by a lock. Between each two telescopic tubes (2,4), a lock with two cylinders (8,10) of different dia. are fitted , rotatably interconnected by an eccentric screw (12). The small dia. cylinder (10) is firmly fixed to the end of the thinner tube (4). The large dia. cylinder (8) fits into the thicker telescopic tube (2), where it is clamped by twisting w.r.t. the other cylinder, when extension to the required length has been carried out. The dia. of the large cylinder equals the outer dia. of the inner telescopic tube.