Patent ID: 7040832

Claim:
A locking device in combination with a telescopic tube assembly, wherein the telescopic tube assembly comprises: an outer tube; and an inner tube slidably received in the outer tube and having multiple adjusting recesses defined in an outer periphery of the inner tube; the locking device comprises: an enclosure partially securely mounted on a peripheral edge of the outer tube and having a lever pivotally connected to the enclosure and having a distal end, a proximal end, a pivot extending from the lever and a through hole defined through the lever close to the distal end; a first space defined in a side face of the enclosure to receive the lever and having a bottom surface abutting the pivot of the lever to allow the lever to pivot in the first space; and a second space defined in the enclosure to be opposite to the first space to receive therein an abutting block to engage with the outer periphery of the inner tube; a first hole in communication with the first space; a second hole in communication with the second space; a bolt screwed through the second hole in the enclosure to abut an outer periphery of the abutting block to force the abutting block to engage the outer periphery of the inner tube so as to secure position of the inner tube relative to the outer tube; and a positioning rod mounted pivotally in the through hole in the lever to be driven by the lever and having a first distal end mounted pivotally in the through hole in the lever; a second distal end; a pivot pin extending through the lever ( 25 ) and first distal end of the positioning rod to allow the positioning rod ( 26 ) to pivot on the lever; a head formed on the second distal end of the positioning rod to correspond to one of the adjusting recesses of the inner tube such that pivotal movement of the lever is able to drive the head of the positioning rod to selectively move away from the corresponding adjusting recess to allow the inner tube to move relative to the outer tube; and a spring mounted around the positioning rod to provide a recoil force to the positioning rod to return the positioning rod to its original position after being driven by the lever to leave the corresponding adjusting recess.