| 摘要 |
<p>The structure includes: four beams (30, 32, 34, 36) parallel to said axis and defining a right-angled parallelepiped-shaped space; a plurality of strut members (52, 54, 56) arranged in the four faces bounding said parallelipiped-shaped space and forming triangled structures; a second end-piece (60) fastened to a second end of the beams to define an inlet (64) into said drum; and means (62) constituting a circular raceway.</p> |
