Trimmer Line for String Trimmers
AssigneeShakespeare Company
InventorDavid B Skinner
Life of this patent
Estimating the term…
Abstract
A novel monofilament trimmer line is provided for reducing noise, reducing air drag and increasing durability by having a non-round cross-sectional shape defined as a polygon with three to six sides wherein the vertices between adjacent sides have been replaced with generous circular arcs, the arcs of a parabola, or even other arc shapes so long as the arc is convex and contains no sharp edges and wherein each arc is tangent to the two adjacent sides with a smooth and continuous transition, and the sides of the polygon are either straight or slightly convex, but not concave.
Claims13
A trimmer line for use with a powered rotary trimmer device, comprising:
- a filament body having a non-circular cross-sectional shape comprising at least three distinct sides wherein each of the sides is straight or convex, the filament body having a longitudinal axis,
- wherein the filament body further comprises vertices equal in number to the number of the at least three distinct sides, the vertices being located where adjacent ones of the at least three distinct sides converge, each of the vertices comprising a convex arc contour, and
- wherein the filament body is fixedly twisted about its longitudinal axis.
A string trimmer line comprising:
- a monofilament body having a non-circular cross-sectional shape comprising three, four, five, or six distinct sides wherein each of the sides is straight or convex, the filament body having a longitudinal axis,
- wherein the filament body further comprises vertices equal in number to the number of the distinct sides, the vertices being located where adjacent ones of the distinct sides converge, each of the vertices and comprising a convex arc contour,
- wherein the filament body is fixedly twisted about its longitudinal axis at a rate of from 1.6 inches to 1.7 inches of the filament body per full 360 degree revolution of the filament body, and
- wherein the string trimmer line is configured for use with a powered rotary trimmer device for cutting grass, weeds, and vegetation.
Dependencies are inferred from the claim text.