| 摘要 |
A cutter head for a suction dredger which includes a central boss (11) mountable upon a power drive shaft (12) and suction head or the dredger, wherein the boss (11) carries at least one spiral-helical web (13) upon which is mounted an array of cutter bits (19) spaced at intervals along the web (13) and projecting therefrom so that their tips define a generally part-ellipsoidal envelope (15), the working direction of the bits (19) and the "hand" of the spiral-helix of the web (13) being such that in use the cuts made by successive bits (19) on the same web (13) are staggered relatively to one another, each succeeding cut being nearer to the larger diameter end of the cutter head.
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