Abstract: An adjustable walking cane includes an inner tube, an outer tube, a connecting rod, a pushing unit and an extending unit. A spring compresses the connecting rod against the extending unit and the pushing unit, a resilient sleeve bears against the inner threaded segment on the outer tube, and then the length of the outer tube and inner tube can be fixed. In the extending process, the inner tube and the outer tube extend outwardly by pulling the cane from two ends thereof, and the inner tube and the outer tube are released from compression while the resilient sleeve is detached from the inner threaded segment. In the retracting process, the inner tube and the outer tube are released from compression while the extending pieces on the extending unit driven by controlling unit is detached from the taper surface of the pushing unit.

Abstract: A key selector device which comprises a switch means to be secured in the vicinity of the lock to be opened, and having an inners protrusion formed for pushing one of the actuating rods movably secured in alignment on the upper wall of a box, in order to enable one of the key hangers pivotably secured in alignment on a lateral axis supported by the opposing side walls of said box, to be angularly moved to a suitable position in which an enlarged triangular protrusion of said one of the key hangers which generally rests on one of the spring leaves, slides over a triangular curved portion of said one of the spring leaves secured in alignment on the rear wall of said box, while a foot portion of said one of the key hangers carrying a desired key projects upward.