| 摘要 |
<p>A device (1) for cutting vegetation comprises a housing (13) rotatable about an axis; a rotatable spool (9) within the housing (13) storing a supply of flexible line (10) having an end extending through an aperture (11) in the housing (13) into a cutting plane normal to said axis; and means for causing relative rotation between said spool (9) and said housing (13) whenever the length of line (10) extending into said cutting plane is less than a predetermined length, to cause additional line to be fed into said cutting plane. The means for causing relative rotation between the spool and the housing comprises a series of angularly-spaced locking faces C provided on the spool (9) (or on a member connected thereto) or on the housing (13); a balance bar (30) pivotally mounted on the housing (13) or on the spool (9), said balance bar (30) having a member (32) for engagement with said locking faces C; and means (23) for positively engaging said member (32) onto said locking faces C.</p> |
