Extensible rod locking device

The utility model discloses an extensible rod locking device which comprises an outer tube and a positioning plunger which can be sheathed in an inner tube and is connected and fixed to the inner tube, wherein the side of the top surface of the positioning plunger is provided with a blocking edge of which the outside diameter is slightly smaller than the inside diameter of the outer tube, the outer part of the blocking edge is provided with an eccentric post of which the cross section is circular, and the eccentric post is sheathed with a C-shaped elastic expansion ring of which the opening is positioned on the side with a thinner wall. The utility model is characterized in that a constraining groove is arranged in the middle section of the outer tube; a spacing batten is arranged on the joint of the top margin of the blocking edge and the eccentric post; the outer end of the eccentric post is also provided with an outer blocking edge of which the outside diameter is slightly smaller than the inside diameter of the outer tube. The utility model has the advantages of simple structure, convenient operation and accurate positioning, and simultaneously, the utility model has the functions of water discharge, sealing and convenient locking. The utility model is a better choice of structure for cleaning poles, etc., and the utility model has good value of popularization and application.