Abstract: A wiper blade includes a lever assembly that has several types of levers. The levers of each type are efficiently manufactured in the following manner. First, a lever unit, which has a frame bar and several levers integrated with the frame bar, is pressed. Each lever has a hole. Then, a wire is fed through the holes of the levers. The frame bar is separated from the levers to form a hanging unit, which includes the wire and the levers hanging from the wire. In this state, the lever is coated with paint. After the paint is dried, the wire is removed form the levers.

Abstract: A bearing device for a rotary shaft is comprised of a porous sliding bearing and a felt ring fit around the sliding bearing. The sliding bearing and the felt ring are filled with lubricant oil. The felt ring is made of needle-punching polypropylene fibers of 0.4-20 micrometers in diameter. The felt ring is manufactured by shaping the polypropylene fibers into a felt sheet, heat-treating the felt sheet to eliminate fuzz from the sheet surfaces, and punching the felt sheet in a ring shape. The sliding bearing has a plurality of grooves on its outer peripheral surface with which the felt ring contacts. Each groove is formed to extend in a horizontal direction to restrict the lubricant oil from flowing downward.

Abstract: A wiper blade includes a lever assembly that has several types of levers. The levers of each type are efficiently manufactured in the following manner. First, a lever unit, which has a frame bar and several levers integrated with the frame bar, is pressed. Each lever has a hole. Then, a wire is fed through the holes of the levers. The frame bar is separated from the levers to form a hanging unit, which includes the wire and the levers hanging from the wire. In this state, the lever is coated with paint. After the paint is dried, the wire is removed form the levers.