| 摘要 |
PROBLEM TO BE SOLVED: To provide a drum assembly formed of waste plastics, inexpensive to manufacture because it is strong, waste plastic usable and mass-productive. SOLUTION: A drum assembly comprises a pair of disc collar members 1 having cylindrical protrusions 3 formed at the centers on the single sides and tapered body forming pieces 4 with protruding portions 5 protruding at six places so as to encircle the cylindrical protrusions 3 and a cylindrical connecting member 7 having a second hole portion 8 and recessing portions 9 carved in the outer periphery. The pair of collar members 1 are opposed to each other, one body forming pieces 4 are inserted between the other body forming pieces 4, the cylindrical protrusions 3 are fitted in the second hole portion 8 of the connecting member 7 at its ends and the protruding portions 5 of the body forming piece 4 engaged with the recessing portions 9 of the connecting member 7, thus producing the drum assembly formed of waste plastics.
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