Patent ID: 8832910

Claim:
A locking device for use with a pole, the pole having a plurality of connection tubes slidably coupled to each other in the lengthwise direction thereof, wherein a lower connection tube ( 4 ) having a relatively smaller diameter than an upper connection tube in two neighboring connection tubes is slidably inserted into the upper connection tube ( 2 ) in such a manner as to be locked to the upper connection tube ( 2 ) or released from the locked state, the locking device comprising: a grasping tube ( 200 ) having a body ( 210 ) coupled to an end periphery of the upper connection tube ( 2 ), incision portions ( 222 ) formed at a left side and a right side in the radial direction in such a manner as to provide an upper arch-shaped grasping piece ( 220 ) and a lower arch-shaped grasping piece ( 230 ) formed independently on an upper portion and a lower portion thereof, and upper and lower pressing parts ( 224 , 234 ) extended outwardly from both sides of each of the upper arch-shaped grasping piece ( 220 ) and the lower arch-shaped grasping piece ( 230 ); operating pins ( 300 ) adapted to be inserted in an up and down direction into through-holes ( 226 , 236 ) formed on the upper and lower pressing parts ( 224 , 234 ) formed on both left and right sides of the upper arch-shaped grasping piece ( 220 ) and the lower arch-shaped grasping piece ( 230 ); an axial lever ( 400 ) having a pressing plate ( 410 ) extended in the lengthwise direction of the pole and a cam type hinge part ( 420 ) formed on an end portion of the pressing plate ( 410 ) in such a manner as to be hinge-coupled to upper protruded end portions of the operating pins ( 300 ) to a state of being rotated in the lengthwise direction of the pole, and wherein each operating pin ( 300 ) comprises an upper pin ( 310 ) adapted to be slidably inserted into the through-holes ( 226 , 236 ) of the upper and lower pressing parts ( 224 , 234 ) of the grasping tube ( 200 ) in an up and down direction and having upper end portions hinge-coupled to the axial lever ( 400 ), and an adjusting screw ( 320 ) adapted to be inserted upwardly into the through-holes ( 226 , 236 ) of the upper and lower pressing parts ( 224 , 234 ) in such a manner as to be screw-coupled to the upper pin ( 310 ), the adjusting screw ( 320 ) having a head ( 324 ) locked to the lower pressing part ( 234 ).