Schneidkopf für Trimmer mit Flexiblem Schneidfaden

摘要

A "bump-feed" type line head (108) and replaceable spool (116) for a flexible line trimmer are specially adapted for removing and mounting the spool (116) in a single manual movement to the line head (108) to facilitate spool (116) and line replacement. The line head (108) includes a "U" shaped retention spring (118) mounted within a hub (114) in the line head (108) on with the spool (116) is journalled. The spring (118) includes knob-shaped sections protruding through the hub (114), beneath the spool (116), for retaining the spool (116) on the hub (114) without interfering with a bump-feed indexing means. Pulling the spool (116) from or pushing the spool (116) onto the hub (114) tends to deflect the knobs (122) inwardly, allowing axially movement of the spool (116) on the hub (114). The compression force of the spring (118) is set to be sufficient to retain the spool (116) on the hub (114) during normal operation but not to withstand force manually applied in an axial direction to the spool (116). The spool (116) includes an integrally formed reel and an integrally formed button (130) connected in a single movement to the bottom of the spool (116) using undercut surfaces (136,138), forming a cavity having a radius sufficient to accommodate extension of the knobs (122) beneath the spool (116).