| 摘要 |
<p>The drum has a cylindrical wall section over which skin is stretched. Plastics tubes (1) are longitudinal joined by welding or glueing. Plastics tubes are circumferential covered e.g. by sheet metal strip (4). The cylindrical drum wall is formed by glued plastics tubes which are chamfered at both ends, over which drum skins (2,3) are stretched. Inside the drum wall circumference and drum skins, a curved damping element (5) is fitted with a pretensioned adjustable spring arrangement.</p> |
