Abstract: A fixed line top-loading trimmer head for string trimmer machines, uses line segments of a predetermined length. The head has a central hub designed for attachment to the drive shaft of a string trimmer machine. A circular flange is attached to, and extends outwardly from, the central hub. This circular flange has one or more trimmer line exit openings on the circumference. The hub, located above the upper surface of the circular flange, is provided with either line termination apertures in the form of holes or channels which are angularly offset from the exit openings in the circular flange; or it is provided with an offset guide channel through which a trimmer line is passed between the exit openings. A line guide channel is located in the flange between the line exit openings and the line termination apertures, or the offset channel on the hub, for guiding line between the exit openings and the offset channel or termination apertures.

Abstract: A method and apparatus for packaging coiled nylon copolymer trimmer line comprises making the package of plastic material which is capable of melt bonding, either by the application of heat and pressure, radio frequency (RF) or by ultrasonic welding. The container comprises a backing sheet and a pre-formed bubble having an opening in it, with a flange extending outwardly around the opening. The flange is placed on the backing sheet; and the two sheets are heat-melt bonded together by a suitable technique, to produce a strong, integral package which significantly resists separation of the flange from the backing sheet. After the package has been formed, nylon or nylon copolymer, or other plastic, trimmer line is wound into the package, and the bond between the flange and the backing sheet is greater than the compression spring force exerted by the wound trimmer line against the package, preventing separation of the package parts from one another.

Abstract: An improved package and method for manufacturing extruded monofilament string trimmer line incorporates preconditioning of the line to provide a high moisture content. Straight line segments are produced by feeding the extruded line through a straight guide after surface cooling or quenching and cutting the line segments as the line exits the guide. The line then is packaged in a sealed package with a removable cap to permit withdrawal of line from the package. A moisture-laden sponge may be placed within the bottom of the package to maintain a high humidity within the package. Copper chloride or cobalt chloride salts also may be coated on the line, or added to the plastic forming the line to provide a color indication of the relative moisture content of the line.

Abstract: 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.

Abstract: An improved package and method for manufacturing extruded monofilament string trimmer line incorporates preconditioning of the line to provide a high moisture content. The line then is packaged in a sealed package with a removable cap to permit withdrawal of line from the package. A moisture-laden sponge may be placed within the bottom of the package to maintain a high humidity within the package. Copper chloride or cobalt chloride salts also may be coated on the line, or added to the plastic forming the line to provide a color indication of the relative moisture content of the line.

Abstract: A line for a rotating trimmer has a plurality of longitudinal outwardly-extending cutting edges, spaced circumferentially about the main body portion of the line. A cross-sectional area of the main body portion is selected to be between 70 percent and 90 percent of the area of the space circumscribing the cutting edges to provide substantial bulk to the line to increase its wear, while retaining the advantages of the cutting edges for facilitating cutting of grass and the like.

Abstract: A line for a rotating trimmer has a plurality of longitudinal outwardly-extending cutting edges, spaced circumferentially about the main body portion of the line. A cross-sectional area of the main body portion is selected to be between 70 percent and 90 percent of the area of the space circumscribing the cutting edges to provide substantial bulk to the line to increase its wear, while retaining the advantages of the cutting edges for facilitating cutting of grass and the like.