초록 ▼

The present invention is a one-piece fixed line vegetation cutting head with several advantages. It is easily adaptable to virtually any vegetation trimmer and it will accommodate a variety of types and gauges of both cutting filament line and wire. The preferred embodiment has an upper portion with

The present invention is a one-piece fixed line vegetation cutting head with several advantages. It is easily adaptable to virtually any vegetation trimmer and it will accommodate a variety of types and gauges of both cutting filament line and wire. The preferred embodiment has an upper portion with the shape of an inverted truncated cone which gives the head an advantage in deep vegetation by hindering the advance and entanglement of long pieces of vegetation around the vegetation trimmer's drive shaft. The preferred embodiment also has a disc-shaped lower portion with two pairs of cutting filament line passage holes in opposed positions near the circumference of the disc which are oriented at oblique angles to both the diameter and the central bore of the disc. When a discrete length of cutting filament line is inserted through the adjacent passage holes in each pair, it is subjected to less bending and wear during high speed rotation than would be experienced with the use of non-angular passage holes. Further, in the preferred embodiment, the lower portion has a tapered edge allowing a closer cutting angle when the cutting filament line becomes shortened due to wear. The simplified and improved design of the present invention reduces the need to replace cutting filament line as often and further enables a user to replace the cutting filament line within seconds when it becomes worn since no knotting of cutting filament line is required and there is no need for any disassembly of parts.

대표청구항 ▼

[ What is claimed is:] [1.] A one-piece cutting head for attachment to the drive shaft of a vegetation trimmer, said cutting head comprisingan upper portion having the shape of an inverted truncated cone, said upper portion also having a longitudinal axial bore with a diameter dimension sufficient f

[ What is claimed is:] [1.] A one-piece cutting head for attachment to the drive shaft of a vegetation trimmer, said cutting head comprisingan upper portion having the shape of an inverted truncated cone, said upper portion also having a longitudinal axial bore with a diameter dimension sufficient for insertion therethrough of the drive shaft of the vegetation trimmer; anda disc-shaped lower portion downwardly depending from said upper portion, said lower portion having a circumference and a central bore, said central bore communicating with said axial bore of said upper portion so as to also allow insertion therethrough of the vegetation trimmer's drive shaft, said lower portion having a plurality of pairs of cutting filament line passage holes therethrough, each of said cutting filament line passage holes within each of said pairs are approximately parallel to one another, said pairs of cutting filament line passage holes being evenly spaced from one another, each of said cutting filament line passage holes being downwardly angled through said lower portion toward said circumference, said cutting filament line passage holes each also being positioned through said lower portion so that upon rotation of said cutting head one of said cutting filament line passage holes in each of said pairs becomes a leading hole and the other of said cutting filament line passage holes becomes a trailing hole each of said leading holes being oriented toward said central bore and each of said trailing holes being oriented toward said circumference so that when individual lengths of cutting filament line are inserted downwardly through each of said pairs of cutting filament line passage holes said cutting filament line is subjected to less bending at high rotational speeds for less wear.