| 摘要 |
A rotary cutter head assembly comprises a cutting element including a substantially spherical enlarged retaining portion, a filamentary flexible elongate cutting portion, and a substantially cylindrical intermediate strengthening portion, which is integral with and between the retaining portion and the filamentary portion and is of smaller cross-sectional area than that of the retaining portion, and a head including a first flange which is substantially planar, a second flange which is substantially planar and which extends substantially parallel to and is spaced from the first flange so as to define a channel between the first and second flanges, in which channel the retaining portion of the cutting element is releasably and pivotally retain. The first flange has an aperture therethrough having a first aperture portion which is sized such that the enlarged retaining portion of the cutting element is able to pass therethrough, and a second aperture portion which is sized such that the enlarged retaining portion is unable to pass therethrough and such that the strengthening and cutting portions are able to pass therethrough. The second flange has a similar aperture therethrough, including aperture portions similar to and opposite those in the first flange. The first and second flanges are spaced apart by a dimension which is smaller than the diameter of the retaining portion whereby the retaining portion extends into the first aperture portions in the flanges to retain the retaining portion within the channel.
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