| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a drum which solves the problems that: a size after disassembly of a fastening drum which can be disassembled is almost the same size of that after assembly; almost all man power of assembly is strapping work to a skin; assembly/disassembly work of a body is not easy, as large force is applied to a hoop; it is impossible to make a diameter of the skin small in a drum diameter direction; it takes long to assemble the skin and the body, as straps must be inserted into holes; it takes long to fasten straps to fix the skin to the body; and it requires skill to give the skin optimum tension. <P>SOLUTION: By using a plurality of board materials in which a groove is curved in an outer peripheral side, a navel shape is formed in both short faces crossing to a peripheral direction, and they are combined to form the body which can be disassembled. A state that straps are fastened is held by inserting a hollow stick into a slack portion by strapping a ring shape strap to the groove of the body. A plurality of ring structures which matches an outline of the skin are fixed, and one side of S-shaped metal piece of a plate form is attached to the structure from a cut section of the skin, and the strap is strapped to the other side. A U-shaped metal piece is attached to the strap between upper and lower skins, and the strap is fastened to give optimum tension to the upper and lower skins. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
