Extension arm for windscreen wiper

The extension arm for the windscreen wiper comprises an extension rod and a hinge seat which are integrally formed, the hinge seat comprises two hinge plates which are symmetrically distributed on the two sides of the extension rod, each hinge plate is provided with a hinge hole in a penetrating mode, the two hinge holes are coaxially arranged, and the extension rod is connected with the hinge holes in a sleeved mode. Mounting grooves are formed in the opposite positions of the two hinged plates, a wear-resisting piece is embedded in each mounting groove, and the end of each wear-resisting piece protrudes out of the corresponding mounting groove. And compared with the hinged plate, the wear-resistant sheet has higher wear resistance and is not easy to wear. And the end part of the wear-resistant sheet protrudes out of the mounting groove and is in direct contact with the arm seat to separate the hinged plate from the arm seat, so that the hinged plate is not easy to wear, and the normal use of the windscreen