Patent ID: 9545714
Date: 2017-01-17
CPC Classifications: B25G

Claim:
1. A rotary extension rod, comprising: an outer tube; an inner tube, received in the outer tube in an axially movable manner; a rotatable assembly, having a knob, a fixing seat, and a link; the knob being deposited at one end of the outer tube and rotatable between a locking position and a releasing position; the fixing seat being received in the outer tube and fixed to one end of the inner tube, the fixing seat having an axial hole for the link to extend therethrough and two axial rods defining a hollowed-out portion communicated with the axial hole; and the link having one end fixed to the knob and an opposite end rotatably received in the fixing seat and located between the two axial rods, and including two opposite first radially raised portions formed on an outer periphery thereof; and a positioning ring, being mounted around the fixing seat and having the link passing therethrough, and the positioning ring further having two opposite second radially raised portions formed on an inner annular surface thereof, the positioning ring having a C-shaped sectional profile and being adapted to clamp the two axial rods of the fixing seat therein; wherein, when the knob is at the locking position, the first radially raised portions of the link abut against the second radially raised portions of the positioning ring, so that an outer annular surface of the positioning ring presses against an inner wall of the outer tube, and when the knob is at the releasing position, the first radially raised portions of the link depart from the second radially raised portions of the positioning ring, so as to make the outer annular surface of the positioning ring separate from the inner wall of the outer tube.