Patent ID: 8215863

Claim:
A locking mechanism for poles, comprising: a support rod inserted into a first unit shaft at a first end thereof and locked to a second unit shaft at a second end thereof, with threads formed around part of an outer circumferential surface of the support rod; and a pressure locking unit movably engaged with the threads of the support rod through screw-type engagement, with at least one pair of longitudinal slits formed in the pressure locking body such that the slits are open in one direction, and with two or more pressure parts formed in the pressure locking body in a longitudinal direction, wherein the pressure locking unit comprises: a first pressure locking body having both at least one pair of slits and an annular-shaped first pressure part formed around an edge of the first pressure locking body; and a second pressure locking body having both at least one pair of slits and an annular-shaped second pressure part formed around an edge of the second pressure locking body, wherein the support rod comprises: first threads formed around an outer circumferential surface of the support rod; a tapered shoulder part formed around the support rod at a location above the first threads; and second threads formed around the support rod at a location above the tapered shoulder part and having a diameter less than that of the first threads, wherein the first pressure locking body is movably engaged with the second threads of the support rod through screw-type engagement, the support rod is provided on the second threads with a wedge part having a tapered outer circumferential surface, the first pressure locking body is provided on an inner circumferetial surface thereof with a first tapered seat part so as to correspond to the tapered outer circumferential surface of the wedge part, and the second pressure locking body is movably engaged with the first threads of the support rod through a screw-type engagement, and is provided on an inner circumferential surface thereof with a second to tapered seat part so as to correspond to the tapered shoulder part of the support rod.