Frame coupling structure of windshield wiper

A windshield wiper, comprising:

• a primary frame member formed in an inverted U-shape, comprising a middle portion forming an opening in which a positioning bar adapted to be coupled to a wiper arm is mounted and end portions each forming first mounting holes and second mounting holes;
• and
• secondary frame members each of which comprises symmetrically arranged wall plates and having two opposite ends respectively forming a pawl for mounting a rubber blade, a positioning section being formed between the wall plates and slightly projecting beyond the wall plates to define therewith symmetrically arranged receiving slots, each of the wall plates having a middle portion having an inside surface forming a boss;
• wherein the primary frame member has vertical side plates that are fit into the receiving slots defined between the positioning section and the wall plates of each of the secondary frame members, the primary and secondary frame members being capped and covered by a main cover and side covers, whereby the wall plates of the secondary frame member cover and clamp the vertical side plates of the primary frame member and whereby with the bosses of the wall plates fit into the first mounting holes defined in the primary frame member, coupling tightness between the primary and secondary frame members is enhanced to make the wiping operation of the wiper smooth and eliminate noises that are possibly generated during the wiping operation of the wiper.