| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive and easily assembled drum. SOLUTION: A drum 1 is composed of a body 3 consisting of many body pieces 2 divided along its circumference, sheet type drum bodies 4 provided at both the ends of the body 3 opposite to each other, fixed plates 5 which are arranged outside the drum bodies 4 opposite to each other to press and fix the drum bodies 4, and a fixing cord 8 which is inserted into many through holes of the drum bodies 4 and many fixation holes of the fixed plates 5 and is tightened to press and fix the drum bodies 4 to the body 3. Thus, the drum 1 has a specific constitution and the drum body 4 can be formed of an inexpensive material such as a recycled article; and the body 3 can be formed of an inexpensive woody material except one mortised plate (mortised timber) of tree, the drum is inexpensive, easily assembled and suitable for school teaching materials, and the drum and its assembling method are obtained in consideration of environment by making good use of recycled materials.</p> |
