A - Human Necessities – 01 – G
Patent
A - Human Necessities
01
G
A01G 3/06 (2006.01) A01D 34/416 (2006.01)
Patent
CA 2121810
2121810 9308959 PCTABS00021 A line trimmer head (10) for a vegetation cutter having an automatic line feed mechanism which replenishes the line (19) as a result of changes in centrifugal force. The line trimmer head (10) comprises a reel housing (14) which rotates with a shaft (12). A spool (18) containing a supply of line (19) is located within the housing (14). An indexer cam (16) is journaled on the shaft (12) and is axially and rotatably shiftable with respect to the shaft (12). The indexer cam (16) is periodically axially shifted and rotated by a reduction in the centrifugal force applied by the line (19) to the spool (18). A spring (20) is provided to bias the indexer cam (16) axially relative to the housing (14) away from an interlocked position. In the interlocked position, the indexer cam (16) and housing (14) are interlocked together so that the spool (18), indexer cam (16), housing (14) and shaft (12) rotate together. The indexer cam (16) is shifted axially to cause the indexer cam (16) to be disengaged from the housing (14) allowing the spool (18) and indexer cam (16) to rotate relative to the housing (14). As the spool rotates a predetermined incremental amount relative to the housing, an increment of line (19) is fed from the spool (18). Centrifugal force applied by the line (19) may be reduced by either a reduction in the length of the line (19) or by a reduction in the speed of rotation of the shaft (12).
Macrae & Co.
Ryobi Outdoor Products Inc.
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