| 摘要 |
<p>A tyne assembly (16) is rotatable about an axis (15) and comprises multiple sets (28) of tyne elements (22). The tyne elements are carried by support means (18) which are angularly spaced about and extend generally parallel to the axis. The support means may be in the form of multiple rods, bars or pins. Each tyne element comprises a pair of elongate projecting tynes (24, 25) with sharp tips (23) and bridged by a curved or bent centre portion (26). The tyne elements are retained by the support means in one or more of the co-planar sets (28), each such set comprising two or more tyne elements which are arranged so that they do not overlap but have their centre portions angularly spaced about the axis so that the tynes project at variable angles with respect to the axis.</p> |
