| 摘要 |
A fixed line trimmer head for string trimmer machines is made to accommodate trimmer lines of a range of line sizes, from a relatively small diameter line to a maximum diameter line, typically from 0.080'' to 0.160''. To accomplish this, the trimmer head consists of a generally cylindrically-shaped hollow main housing member having a central axis through it. Exit openings for the line are formed on diametrically opposite sides of the main housing member in a plane which is perpendicular to the axis of the housing member. A first set of string entry holes is formed through the housing member in a plane which is offset from the plane of the exit openings; and these holes are located on opposite sides of a line which is perpendicular to the projection of a line passing through the exit openings. A second set of string entry holes is located on the opposite side of the hollow main housing member from the first entry holes; and these second holes have a diameter which is greater than the diameter of the first and second entry holes. Typically, the diameter of the first and second entry holes is selected to accommodate the smallest size line which may be used with the trimmer head; and the diameter of the entry holes for the third and fourth entry holes is selected to accommodate the largest size line which may be used with the trimmer head. The exit openings are selected to accommodate the largest size line which may be passed through the third and fourth entry holes.
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