| 摘要 |
An improved cutting head for rotary mowers and trimmers for vegetation, having major components that are interchangeable and reversible, comprises a pair of housing members having cylindrical side portions and radially extending portions. The housing members are coaxial and enclose a pair of coaxial flail spools, each spool having at least one flail and preferably a pair of flails, wound thereon. Flail may be extended from both spools to provide four cutting flails or from only one spool to provide two cutting flails. The spools are stressed apart axially toward confronting inner surfaces of the housing members by a compressed spring therebetween, thus to cause ribs on the spools and stop lugs on the inner surfaces of the housing members to cooperate in providing ratchet arrangements to allow portions of flails to be fed through the housing member cylindrical side portion upon release of a manual knob. With the knob tightened, the housing members are secured against the spools so that the ratchet arrangements secure the spools against turning, while the housing members are seated together to define an enclosure for the spools.
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