| 摘要 |
An extension rod includes a body having an axial passage and a restriction hole and a positioning hole are respectively defined radially in the body and communicate with the axial passage. A shaft of a control member is rotatably inserted into the positioning hole and includes a recess defined in radially which is located within the axial passage. An operation rod is axially movably inserted into the axial passage and a spring is biased between the operation rod and an end piece which seals the axial passage. The operation rod is engaged with the recess and includes first and second dents in different depths. When rotating the shaft, the first and second dents are movable to receive a bead in the restriction hole such that the bead is control to protrude out from the restriction hole to position or release a socket mounted to the body. |
