| 摘要 |
PURPOSE:To form lugs, ribs or the like easily and eliminate the generation of recessed hollow sections or the like inside the lugs and ribs by providing a gentle arc recessed section on the lower surface of a central band-shaped body of an unvulcanized rubber sheet, making the sheet round inwardly to form a hole in the center, also inserting wheel rims in open sections formed on arc recessed sections of fin sections, right and right, and heat pressurizing. CONSTITUTION:A projection 1c is formed on an upper surface (e) of a central band-shaped body 1a, and a lower surface (f) is made a gentle arc recessed section, while both lower surfaces of fin sections 1b, 1b are made gentle arc recessed sections (g), and fin sections 1b, 1b are made round inwardly with the arc recessed sections (f) as the center, and a central band-shaped body 1a and crests (k) of left and right fin sections 1b, 1b are bonded together to form a hollow 2 in the center, and a surface treated wheel rim 4 is inserted into an open section 3 formed with arc recessed sections (g), (g) of the left and right fin sections 1b, 1b facing each other below the hollow, and stuck directly with the recessed sections (g), (g) or through a thin unvulcanized rubber sheet. Pressure heating is carried out in a mold, and vulcanization and bonding with rubber are carried out simultaneously. |
