| 摘要 |
<p>A drum (10) is formed by producing a cylindrical shell (11), establishing a pair of spaced annular rings (12) near but not at respective ends of the shell (11), positioning sleeve nuts (13) in apertures at circumferentially spaced intervals around each of the rings (12), positioning skins (15) over each respective end, and clamping each skin (15) in place and stretching it by tuning bolts (21) which extend through a retaining hoop (19) and engage the nuts (13) to urge the hoop (19) in an axial direction towards the centre of the drum (10).</p> |
