The invention relates to a cutting monofilament (1) for a vegetation cutting machine such as a brush cutter or an edge trimmer, having a cross-section comprising at least two portions (10, 11, 12) made of thermoplastic materials having different mechanical properties, said cross-section being constant along a longitudinal axis (X) of the monofilament, wherein each of said portions (10, 11, 12) has a continuously varying position along said longitudinal axis of the monofilament and the arrangement of each portion relative to the cross-section is constant along said longitudinal axis.

The invention also relates to a process of manufacturing monofilament, comprising drawing the monofilament from a rotating extrusion head.

Utilizing embodiments comprised of atomic structures with superior tensile strength and compressibility such as carbon fiber; wrapped, molded, fused, or applied to a flexible embodiment; provides an embodiment that can still flex, but with superior reliability and safety. Plastic/nylon and similar embodiments rotating around an axis have little tensile strength and break apart as they hit objects. Carbon fibers or like materials; fused, molded, or applied to a rotating flexible embodiment add strength, while allowing it to still flex. Fusing, molding, wrapping, or applying intertwined fibers asymmetrically cancel torques as centrifugal forces try to straighten these flexible embodiments, leaving it a stronger embodiment. Intertwined fibers fused, molded, wrapped or applied asymmetrically to a flexible tube type embodiment create natural incremental weak/break points, automatically balancing around a rotating head, as well as to increase safety as the crossover points compress air, limiting flight of a broken off object.

Systems and methods for cutting grass and other materials using a disk-shaped cutting web. The cutting web has a center portion that is attachable to a rotating shaft adapter. The center portion may be a solid annular disk having a keyed aperture that allows it to be mounted on a spindle of a rotating shaft adapter. The cutting web has multiple strings that are connected to the center portion and extend outward from it in a generally radial direction (away from the center of the disk). The strings intersect with each other to form junctions at which they are joined, thereby forming a web that can be rotated at high speed to perform a cutting function. The strings of the web can have sharp or serrated edges and may be colored to increase the visibility of the web.

Systems and methods for using interchangeable tool attachments in multi-use tools. In one embodiment, a multi-use tool includes a motor, a shaft and a shaft adapter at the end of the shaft. The motor has user controls (e.g., on/off switch or throttle) that control the motor to drive the shaft and cause it to rotate. The shaft may include a rigid tubular outer member with a flexible inner shaft. The shaft adapter is coupled to the end of the rotating portion of the shaft. The shaft adapter has a mounting flange that rotates with the adapter at the end of the shaft. An interchangeable tool attachment is secured to the mounting flange, and rotation of the shaft adapter and mounting flange causes the tool attachment to rotate as well. Many different tool attachments can be interchangeably secured to the mounting flange to provide corresponding, different functions to the tool.

A line blade for a rotating trimmer includes a loading section securable for rotation on a cutting plane with a head of the rotating trimmer. A living hinge extends from the loading section. A transition section extends from the living hinge and has a first cross-sectional shape. The first cross-sectional shape is configured and oriented to reduce drag. A cutting segment extending from the transition section has a second cross-sectional shape that is different from the first cross-sectional shape of the transition section, where the second cross-sectional shape is configured and oriented for cutting vegetation. The multi-zone line blade improves cutting at lower speeds, thereby requiring less power.

A trimmer line for use with a trimmer head having an outer diameter and defining an axis of rotation. The trimmer line may include an elongated body having a first end, an opposite second end, and a center between the first end and the second end. The trimmer line also may also include indicia formed on the elongated body and spaced from the center point a distance greater than or equal to about half the outer diameter.

The present invention relates to a manufacturing method for a mower cord and includes pressing a resin wire rod and plastically deforming at least part of the wire rod in an axis perpendicular direction. Work-hardening of a surface of the plastically deformed portion allows dramatic enhancement of mowing efficiency.

The invention relates to a coil (2) of cutting wire for a vegetation cutting machine, wherein the wire (20) is coiled on itself so as to form at least two temporarily bonded turns (21) and a central void (22), characterized in that at least a part of the innermost turn of the coil (2) is welded to the most adjacent turn.

The invention also relates to a cutting assembly for a vegetation cutting machine such as a border trimmer or a brush cutter, said assembly including at least one coil (20) as described above and a cutting head (1) comprising: a body (10) defining an inner recess for the coil (2) and provided with a peripheral opening (12a, 12b) for the emergence of a length of cutting wire separated from the coil, and capable of being driven in rotation by a motor, and a central mandrel (13) for supporting said at least one coil (2), said mandrel comprising at least one arrangement (135) adapted to cooperate with the coil (2) so as to ensure rotational engagement between the mandrel and the coil, the mandrel (13) being able to selectively rotate relative to the body (10).

A grass trimmer head has a trimmer head assembly and a metal-rod blade assembly. The blade assembly is characterized by a length of solid metal-rod, and a spherical portion, attached to one end. The head assembly is made of an inverted metal cup with a plurality of spherical cavities or sockets, placed equidistantly around the internal vertical wall and penetrating the outside wall, creating a predominantly circular opening. The blade assemblies are inserted into the cavities, snapping into place and held loosely by a spring-loaded retainer, for easy removal or replacement. The ball joint formed allows the blade assembly to rotate freely in all directions. Each external opening is extended on the trailing side with a cavity allowing the blade assembly to rotate at higher angles in the trailing and upward directions.

A reversible line blade for a rotating trimmer includes a loading section configured to be securable for rotation with a head of the rotating trimmer, a living hinge extending from the loading section, a transition section extending from the living hinge, and a cutting segment extending from the transition section. At least one of the transition section and the cutting segment has a cross-sectional shape that is configured to generate an updraft when the line blade is rotated clockwise and when the line blade is rotated counter-clockwise.