US Patent 7395577 Universal connection device for windshield wiper blade

A universal connection device mainly contains a cover member having two opposing and parallel walls. The height of each wall decreases gradually towards a front end in a front section and decreases more sharply towards a back end in a back section. Within a middle section between the front and back sections, each wall has a number of through holes of different apertures and a number of protrusions on the inner surface. On top of and between the front sections of the two walls, a liftable tab is provided. The connection device further contains an elongated piece attached to one of the walls of the cover member. The piece has a curved outer surface and a rod on an inner surface for embedding into one of the holes of the cover member.