Locking device for pole

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), the upper and lower pressing parts (224, 234) formed on each of both left and right sides thereof having through-holes (226, 236) formed to be passed in an up and down direction therethrough;
• operating pins (300) each adapted to be inserted in an up and down direction into the through-holes (226, 236) of the upper and lower pressing parts (224, 234);
• and
• an axial lever (400) having a pressing plate (410) extended in the lengthwise direction of the pole and a cam type hinge part (420) extended from 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).