Abstract: A trimmer head for use with a handheld lawn maintenance tool is shaped in a hub-and-spoke manner, wherein the trimmer head includes a housing formed of a hub, a circular rim, and a plurality of spokes extending therebetween. A spool is positioned within the hub, and a pair of pieces of trimmer line are inserted into opposing sides of the circular rim through the spokes for winding onto the spool. The trimmer line extends outwardly from the housing at a location spaced away from the hub.

Abstract: The invention provides a grass trimmer and a cord delivering method for a grass trimmer, the grass trimmer includes an extending rod, an housing, a grass trimming head, a handle, a main motor and a main switch, wherein the grass trimming head includes a base, a cap and a spool having a first state relative static with the base, and the grass trimmer further includes a cord delivering mechanism; the cord delivering mechanism includes a cord delivering electronic switch independent of the main switch and a control device; and the cord delivering electronic switch operably electrically controls the control device to enable the spool to be in a second state capable of generating a rotary speed difference with the base. An operator does not need to interrupt work of the grass trimmer and can timely pay off required and the cord delivering operation is simple and convenient.

Abstract: A blade housing assembly for a power operated rotary knife including a split blade housing and a cam mechanism for changing a blade housing diameter between blade supporting and blade changing positions. The split blade housing includes an annular blade support section, a mounting section and a split extending through the mounting section and an inner wall of the blade support section and defining a split distance between first and second circumferential ends of the inner wall. The split includes a radial split section and an angled split section adjacent the inner wall. The mounting section includes first and second body portions on opposite sides of the split. The cam mechanism includes a cam plate bridging the first and second body portions and a cam member rotatably supported by the cam plate. The cam member is rotatable between closed and open positions to change the blade housing diameter.

Abstract: A trimmer head arranged to be driven to rotate a trimmer line, where the trimmer head includes a housing and an inner body connected to a trimmer line spool. The inner body is arranged to be movable relative the housing so that a trimmer line spooled around the trimmer line spool is released and pulled out by a centrifugal force caused by the rotation of the trimmer head, thereby allowing feed of the trimmer line. The trimmer further includes drive means for driving the trimmer head to rotate, and the trimmer is arranged to cause a relative movement of the inner body relative the housing by changing the rotation speed of the trimmer head.

Abstract: A rotary knife includes a rotatable annular blade. The blade includes a blade wall presenting an annular inner surface terminating at a cutting edge. The annular inner surface includes a first section and a second section, with the first section extending from the cutting edge and the second section being located further from the cutting edge than the first section. The first and second sections define first and second angles, respectively, relative to an imaginary plane transverse to the axis about which blade rotates. The second angle is greater than the first angle.

Abstract: A hand-held cutting device (10) including an elongated member (45), a trimmer head (25), and a power unit operably coupled to the trimmer head (25) to selectively cause rotation of the trimmer head (25). The trimmer head (25) includes a line holding assembly (110, 310) to hold and selectively release trimmer line (70), and a housing to house the line holding assembly (110, 310), wherein the line holding assembly (110, 310) includes a core (140, 340), a line-release knob (160, 350), and a spool (130) configured to hold the trimmer line (70). The knob (160, 350) is axially movable with respect to the core (140, 340) between an extended first position and a retracted second position, the knob (160, 350) extending outwardly from the housing and being non-rotatably fixed to the core (140, 340) when the knob (160, 350) is in the first position.

Abstract: A trimmer can be converted from an existing cutting medium to an alternative tool without requiring removal of the trimmer head. A common upper receiver head, as sold by an original equipment trimmer manufacturer, incorporates design provisions to snugly allow an easy/comfortable fit for a series of uniquely adaptable and convertible cap attachments such as, monofilament systems, unique molded or shaped flexible line blades with optional cutting swath diameters, as well as other helpful devices that perform different functions beyond just cutting grass.

Abstract: A grass trimming head includes a housing assembly and a spool. The housing assembly is formed with a housing cavity and an outer aperture for allowing a cutting line to be inserted from an outside of the housing assembly into the housing cavity. At least a portion of the spool is arranged inside the housing cavity, and the spool is rotatable with respect to the housing assembly about a central axis. The spool is formed with an inner aperture for allowing the cutting line to be inserted into the spool or a clamping portion configured to fix the cutting line.

Abstract: A grass trimmer includes a trimming head, a driving device for driving the trimming head to rotate so as to cut vegetation, and an operating device for use in controlling the driving device. The trimming head includes a spool and a line holding element formed with a line holding structure. The driving device includes a motor. The grass trimmer has an auto-winding mode. In the auto-winding mode, the motor drives at least one of the spool and the line holding element to make the spool and the line holding element rotate relatively so that a trimming line is wound on the spool automatically.

Abstract: A mowing head for a trimmer is rotated about an axis of rotation when operated and has a housing with a circumferential wall. A fastening device with a trimmer line guide with a trimmer line channel is provided for the trimmer line. The trimmer line channel has a clamping section with a longitudinal direction. The clamping section has a wide longitudinal side and a narrow longitudinal side, both extending in the longitudinal direction. The clamping section has an inner width tapering from the wide longitudinal side toward the narrow longitudinal side. The trimmer line guide has a deflection edge adjoining the clamping section. The deflection edge is slanted relative to the longitudinal direction such that the deflection edge generates a force component acting on the trimmer line directed toward the narrow longitudinal side when a pulling force is acting on the trimmer line guided through the fastening device.

Abstract: A rotary knife includes a frame, an annular blade, and a blade housing mounted to the frame. The housing presents a circumferential mounting surface in contact with the frame. The housing supports the blade on the frame for rotation about a central axis. The housing includes a blade-supporting race defined along a circle centered on the central axis. The mounting surface is defined along a circular arc with a center point spaced from the central axis, such that the blade-supporting race and mounting surface are eccentric relative to one another. The housing presents opposite inner and outer annular faces. At least one of the faces presents a proximal-most end in contact with the frame and a distal-most end spaced from the frame. The proximal-most end is spaced from the central axis a first distance. The distal-most end is spaced from the central axis a second distance. The distances are different.

Abstract: A cutter head for a brushcutter has a base member with top and bottom base member parts and rotates about an axis of rotation in operation. The top base member part is fixed to the brushcutter shaft end. The bottom base member part is screwed by a screw element to the shaft end. A bearing element is arranged in the base member radially spaced to the axis of rotation. A cutting tool is secured by the bearing element to the base member between top and bottom base member parts. The bearing element is secured either to bottom or top base member part and arranged relative to the other one such that the bearing element is constructively unhindered to move relative to the other base member part at least circumferentially and such that the bottom base member part for mounting or demounting is rotatable relative to the top base member part.

Abstract: Provided is a portable brush cutter with reduced weight and size due to its simple structure with a small number of components that is capable of improving durability and the like as well as effectively suppressing torsional vibration of a transmission shaft. In the portable brush cutter, a one-way clutch to prevent generation of torsional vibration in a rotation transmission path is interposed between an output shaft and a transmission shaft, and bearings are adjacently mounted on the opposite sides of the one-way clutch.

Abstract: A flexible line trimmer head has a housing with first and second parts and a spool for a supply of line. The first and second housing parts are configured to be moved from a spaced relationship towards each other along an operating axis whereupon cooperating connectors engage to block movement of the first and second housing parts away from each other along the axis. The cooperating connectors are provided in pairs at at least three different locations each spaced radially from the operating axis and in a circumferential direction from the other locations.

Abstract: The temperature of exhaust gas discharged from a compact air-cooled engine used as a power source for an engine-driven working machine is reduced. An engine has a muffler mounted directly to the exhaust opening of the cylinder, and a resin muffler cover covering the muffler. An exhaust gas restriction member is provided to a wall surface of the muffler, and two exhaust passages serving as outlets for exhaust gas are formed in the exhaust gas restriction member. The exhaust passages are arranged independent of each other, and the streams of discharged exhaust gas are discharged to be slightly separated from each other as the streams flow away from the exhaust openings. The separated streams of discharged exhaust gas form a negative pressure space between the streams promoting the introduction of a cooling air stream into the negative pressure portion. Thus, the temperature of the exhaust gas can be reduced.

Abstract: The invention is a multi-tiered line trimmer and shredder apparatus using a number of individual pre-molded or pre-cut nail head string lines. Whenever the engine or motor is running, the apparatus rotates the nail head string lines generating cutting power designed to utilize multiple functions, such as trimming grass or weeds, clearing vegetation by shredding or mulching it, or removing snow. The apparatus consists of a base, cylindrical body, nail head string lines, and cover. The base attaches to a drive shaft or directly to an engine or motor. The cylindrical body is hollow, has holes throughout its wall that may be the same or variable sizes. The nail head string lines are inserted into the holes. The cover is used to cover the cylinder body, and to secure the “nail head” portion of the nail head string lines within the cylindrical body while the apparatus is in use.

Abstract: The grass cutting head (1), configured for rotation around a rotation axis, comprises a housing (3) for a cutting line (F); a space (5) inside the housing for winding a stock of cutting line; at least one hole (3B) in a side wall (3A) of the housing (3), through which the cutting line (F) passes from the inner space (5) towards the outside of the housing; At least one cutting blade (21) with at least one cutting edge (23) is associated with the housing (3) of the grass cutting head (1).

Abstract: A drain cleaner including a carrier configured to be carried by a user, a cable configured to be inserted into a drain, a drum positioned and rotatable within the carrier, the drum supporting the cable, a motor positioned within the carrier and operable to rotate the drum, and a cable feed control mechanism coupled to the motor to control operation of the motor. The cable feed control mechanism is configured to feed the cable out of the drum and is positioned at a distance from carrier so a length of the cable extends from the drum to the cable feed control mechanism. The cable feed control mechanism is configured to be carried by the user separately from the carrier.

Abstract: A fixed-line trimmer head for a rotary trimmer device includes the upper portion having a periphery, wherein the upper portion has a plurality of openings spaced from the periphery; and a plurality of mechanisms. Each mechanism can hold a strip of line and includes a post portion disposed through one of the openings in the upper portion, and a flange disposed at one end of the post portion and sandwiched between the upper portion and lower portion of the trimmer head to prevent vertical movement of the mechanism. The post portion includes two line channels, each line channel defining a passageway to receive the same strip of line, wherein at least one of the line channels is curved such that any portion of the strip of line being received through the passageway of that line channel is bent at that portion of the strip of line away from the second line channel while passing through that at least one line channel that is curved.

Abstract: A rotary knife includes a rotatable annular blade. The blade includes a blade wall presenting an annular inner surface terminating at a cutting edge. The annular inner surface includes a first section and a second section, with the first section extending from the cutting edge and the second section being located further from the cutting edge than the first section. The first and second sections define first and second angles, respectively, relative to an imaginary plane transverse to the axis about which blade rotates. The second angle is greater than the first angle.

Abstract: A trimmer head housing having a first part and a second part. The first and second housing parts are configured to be changed between: a) a first state wherein the first and second housing parts are separated from each other; and b) a second state wherein the housing parts are operatively connected to be movable together around an operating axis. The operatively connected housing parts are configured to support at least one cutting component that is configured to effect cutting as the operatively connected housing parts are turned around the operating axis. The trimmer head housing has interacting parts cooperating between the first and second housing parts and configured to allow the first and second housing parts to be operatively connected with the first and second housing parts in only a single angular relationship with respect to the operating axis.

Abstract: A vacuum rotary knife is fluidly connectable to a vacuum source conduit. The rotary knife includes an annular blade and a knife head. The knife head supports the blade for rotation about a rotational axis. The knife head presents a vacuum port fluidly connectable to the conduit. The vacuum port is spaced from the blade such that the knife head defines a suction pathway extending between the blade and the vacuum port.

Abstract: A strand trimmer and method of use thereof. The strand trimmer includes a pair of pivotable arms each having a motor, a follower wheel, and a cutter-spindle assembly disposed thereon. The arms are biased toward one another and are guided by the follower wheels to pivot around obstacles passing between the arms. The motor rotates the cutter-spindle assembly to move cutting strands extending therefrom through a cutting path with sufficient rotational velocity to cut vegetation. The cutter-spindle assembly includes a spool and a strand-feed mechanism. The spool is oriented to rotate about a horizontal axis. The strand-feed mechanism includes a solenoid actuated plunger within a shaft of the cutter-spindle assembly. The plunger engages the spool to control rotation of the spool and thereby feeding out of incremental lengths of the strand.

Abstract: An apparatus including a rotary head assembly, which is configured to allow replacement of at least one cutting member. The rotary head assembly includes at least one spring biased cutting member receptacle sized and configured to receive at least one cutting member.

Abstract: A power operated rotary knife including an annular rotary knife blade supported for rotation in a blade housing. The rotary knife blade including a body and a blade section extending from the body. The body section including an outer wall including an upper, middle and lower portions. The upper portion of the outer wall including a bearing race extending radially inwardly into the outer wall. The lower portion of the outer wall including the driven gear. In one embodiment, the intermediate portion includes an annular land having an outer surface defining a radially outermost portion of the outer wall of the body, the outer surface of the annular land being radially outward of the driven gear and the bearing race. In another embodiment, the intermediate portion includes an annular channel having an inner surface being radially inward of first and second ends of the bearing race and the driven gear.

Abstract: A power operated rotary knife including an annular rotary knife blade supported for rotation in a blade housing. The rotary knife blade including a body and a blade section extending from the body. The body includes an outer wall including an arcuate surface having an upper region extending from a first upper end portion to a second intermediate portion and a lower region extending from the second intermediate portion to a third lower end portion. A plurality of gear teeth extend downwardly from the upper end of the body, each of the plurality of gear teeth including an outer peripheral face forming a portion of the upper region of the arcuate surface of the outer wall. The body outer wall includes a bearing surface having a lower bearing face in the lower region of the arcuate surface and an upper hearing face in the upper region of the arcuate surface.

Abstract: A device for removing an implanted object from a body vessel includes an actuator having an elongated sheath extending therefrom, the elongated sheath including a proximal portion and a distal portion. A tubular outer member has a proximal end attached to the distal portion of the elongated sheath, with a ramped surface at a distal end of the tubular outer member which constricts a diameter of a bore formed in the tubular outer member. A tubular inner member is located within the tubular outer member, the tubular inner member including a proximal end operably connected to the actuator and a distal end opposite the proximal end, the distal end of the tubular inner member including a plurality of resiliently flexible blades positioned to interact with the ramped surface of the tubular outer member such that the ramped surface is operable to deflect the resiliently flexible blades radially inwardly as the tubular inner member is advanced distally within the tubular outer member.

Abstract: A multi-mode trimmer head for use with an outdoor handheld tool such as a string trimmer, brush cutter, or the like is provided. The trimmer head includes an upper housing, lower housing, bump head, spool, and a spring. The spool includes a first pair of apertures configured to receive a pair of flexible trimmer lines to provide a bump-feed operating mode for the trimmer head. The spool also includes a separate, second pair of apertures configured to receive a single fixed-line trimmer line to provide a fixed-line operating mode for the trimmer head. The trimmer head is switchable between the fixed-line operating mode and the bump-feed operating mode without the need to disassemble the trimmer head.

Abstract: A trimmer head for a hand-held cutting device may include a first housing portion, a line holding assembly to hold and selectively release trimmer line, and a second housing portion operably coupled to the first housing portion to house the line holding assembly. The line holding assembly may include a spool configured to hold the trimmer line and a core operably coupled to the spool. The line holding assembly may be configured such that rotational movement of the core causes corresponding movement of the spool, but movement of the core in an axial direction does not cause corresponding movement of the spool.

Abstract: A grass trimmer includes a cutting head for mounting a cutting member, a drive head having a output shaft for driving the cutting head to rotate, and an anti-winding member for preventing the output shaft from being wound to by grass. The drive head includes a drive device to drive the output shaft and a head housing for accommodating the drive device. The output shaft connects to the cutting head and passes through the anti-winding member and the anti-winding member is mounted to the cutting head so as to rotate with the cutting head and is disposed between the cutting head and the head housing so as to fill the space between the cutting head and the head housing.

Abstract: A powered rotary knife includes a handle, a blade housing, an annular blade, and a blade bushing for rotatably mounting the blade within the housing. The blade housing includes an inner groove that is operable to receive the blade bushing therein. The blade housing and blade bushing are split in order to expand and receive the blade. The blade includes an outer groove that is also operable to receive the blade bushing. Thus, the blade bushing is spaced between the blade housing and blade and rotatably secures the blade within the blade housing.

Abstract: Systems and methods for cutting grass and other materials using a disk-shaped cutting web are disclosed. 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.

Abstract: A trimmer can be converted from an existing cutting medium to an alternative tool without requiring removal of the trimmer head. A common upper receiver head, as sold by an original equipment trimmer manufacturer, incorporates design provisions to snugly allow an easy/comfortable fit for a series of uniquely adaptable and convertible cap attachments such as, monofilament systems, unique molded or shaped flexible line blades with optional cutting swath diameters, as well as other helpful devices that perform different functions beyond just cutting grass.

Abstract: A grass trimmer includes a trimming head, a driving device for driving the trimming head to rotate so as to cut vegetation and an operating device for a user to operate so as to control the driving device. The trimming head includes a spool and a line holding member, the spool is used to wind a cutting line, and the line holding member is formed with a line holding structure. The driving device includes a motor. The grass trimmer has an auto-winding mode. In the auto-winding mode, the motor drives at least one of the spool and the line holding member to make the spool and the line holding member rotate relatively so that the cutting line is wound on the spool automatically.

Abstract: A protective glider assembly for a handheld trimmer apparatus includes a glider plate operatively connected to a glider shaft. A bearing acts between the glider plate and glider shaft. The protective glider is configured to rotate or remain stationary independent of and relative to rotation of a rotary head of the handheld trimmer. The glider plate is positionable relative to the rotating head to adjust cutting height of trimmer members. A first series of trimmer members are connected to the head in a first plane which is generally parallel to a second series of trimmer members connected to the head in a second plane. The rotary head forms a trimmer member passage therethrough and includes a fastening mechanism having a pivotally moveable engaging member configured to clear the passage and to extend through a mount aperture of a trimmer member when positioned in the passage.

Abstract: A flexible line trimmer head has a housing with an operating axis and is made up of first and second parts configured to be placed in: a) a first state wherein the first and second housing parts are separated from each other; and b) a second state wherein the housing parts are operatively connected. The first and second housing parts configured so that in the second state a space is defined between the first and second housing parts within which an operatively positioned spool can be captively maintained. The flexible line trimmer head further has a unitary shaft that extends axially between, and connects to, each of the first and second housing parts to maintain a desired aligned relationship between the first and second housing parts.

Abstract: A trimmer head having at least two pivoting line holders for holding multiple folded strips of trimming line is presented wherein said pivoting line holders are retained within said housing between said housing and said cover and extend upward through apertures in said cover, said line holders being capable of movement around a vertical axis of rotation, at least three embodiments are disclosed which provide a rounded landing for supporting the inner radius of a folded strip of trimming line, the rounded geometry of the landing prevents line stress and breakage, the various embodiments include a pivot post having two parallel straight through holes with a rounded vertical wall between the through holes, a single open passageway having a center metal post, and a single open passageway having a series of at least two metal pins through the center of the passageway.

Abstract: A glider assembly for a handheld trimmer includes a glider shaft coupleable at one end with a rotating head of the handheld trimmer, and a glider plate connected to an opposite end of the glider shaft. The glider plate is part-spherical or saucer shaped and includes a concave side and a convex side. A bearing acts between the glider plate and the glider shaft. The assembly enables an operator to rest the weight of the trimmer on the ground during use while controlling a cutting height.

Abstract: A hand-held cutting device (10) may include an elongated member (45) graspable along a portion thereof by an operator, a trimmer head (25) disposed at one end of the elongated member (45) and configured to be rotatable to perform a cutting function using trimmer line (70) held at a portion of the trimmer head (25), a power unit operably coupled to the trimmer head (25) to selectively cause rotation of the trimmer head, and a trim shield (65) disposed to extend away from the elongate member (45) to a position radially outward relative to the trimmer head (25) proximate to at least a portion of a path traced by a distal end of the trimmer line (70) when the trimmer head is rotated.

Abstract: A hand-held cutting device (10) including an elongated member (45) graspable along a portion thereof by an operator, a trimmer head (25) disposed at one end of the elongated member, and a power unit operably coupled to the trimmer head to selectively cause rotation of the trimmer head, wherein the trimmer head comprises a line holding assembly (110) to hold and selectively release the trimmer line (70) and a housing to house the line holding assembly, wherein the line holding assembly includes a core (340) having a first portion (342) and a second portion (350), and a spool (130) configured to hold trimmer line that is operably coupled to the core, and wherein the second portion of the core is non-rotatably fixed to the first portion of the core when the trimmer head is in an at-rest state, and is rotatable with respect to the first position of the core when the trimmer head is in an in-use state and rotating.

Abstract: The grass cutting head (1) comprises a housing (3), inside which a spool (11) is provided to wind the cutting line (F). The housing has holes (9) for the passage of the cutting line (F) towards the outside of the housing. The spool (11) has at least a flange (15) with openings (31) allowing to insert the cutting line (F) into a passage defined between the flange (15) and a transverse wall (3B) of the housing.

Abstract: The invention provides a grass trimmer and a cord delivering method for a grass trimmer, the grass trimmer comprises an extending rod, an housing, a grass trimming head, a handle, a main motor and a main switch, wherein the grass trimming head comprises a base, a cap and a spool having a first state relative static with the base, and the grass trimmer further comprises a cord delivering mechanism; the cord delivering mechanism comprises a cord delivering electronic switch independent of the main switch and a control device; and the cord delivering electronic switch operably electrically controls the control device to enable the spool to be in a second state capable of generating a rotary speed difference with the base. An operator does not need to interrupt work of the grass trimmer and can timely pay off required and the cord delivering operation is simple and convenient.

Abstract: An adjustable guard assembly is connected to a head assembly of a string trimmer. The adjustable guard assembly includes a housing. The housing includes a mounting portion, which connects to a motor case. The housing further includes a deck portion, which extends from the mounting portion. The deck portion has a proximal end and a distal end. A first skirt member extends along and downward from the distal end of the deck portion in a generally radially outward direction. A first blade assembly includes a first blade member, provided in the interior of the first skirt member, to engage a rotating string member.

Abstract: An orthopedic reamer cutting tool is disclosed that incorporates a second material such as graphene having an increased coefficient of thermal conductivity to remove heat generated at the tissue cutting surface during use. The reamer is constructed having a hemispherical cutting shell that extends from an equatorial base to an apex at a distal end. A plurality of cutting teeth, each having a tissue cutting surface, extend from the exterior of the cutting shell. A reamer driver interface may be positioned spanning the diameter of the reamer base. The second material, having increased thermal conductivity, may be applied to the interior and/or exterior shell surfaces. In addition, the second material may be incorporated within the shell or the driver interface.

Abstract: In order to obtain favorable cutting quality throughout a long-term, a rotating body has a brace that rotates integrally with a drive shaft of a mower, and a main body made of synthetic resin that is joined to the brace. The main body includes an upper body that is joined to the brace, a flange portion having a diameter larger than that of the upper body, a lower body having a diameter smaller than that of the flange portion, and an engaging structure with which the linear cutter is engaged. The upper body has, on the outer circumferential surface thereof, a plurality of outlets, from each of which one end of the linear cutter is pulled out. With the upper body integrally joined to the lower body with the flange portion therebetween, the linear cutter that is pulled out of each of the outlets is positioned above the flange portion.

Abstract: The battery housing assembly, connected to a support shaft assembly of a string trimmer, includes a base housing member defining a chamber configured to receive a battery therein. The base housing member includes a frontal member configured to engage a front of the battery, a top member extending from the frontal member, configured to engage the top portion of the battery, and a bottom member, configured to engage a bottom portion of the battery. A first side member is configured to be removably connected to a first side of the base housing member; and a second side member configured to be removably connected to a second side of the base housing member.

Abstract: A high-efficiency cutting system for an autonomous mower provides a multiple blade tip cutting radius for a cleaner cut, and more complete mow. The system includes a spinning blade disk provided within a housing including a vertical standoff. The blade disk includes a first pair of cutting blades located between the center of the blade disk and the circumference of the blade disk, and a second pair of cutting blades located radially inward from the first pair of cutting blades. The cutting blades extend downward and away from the blade disk at an angle.

Abstract: The cutting knife has a base member with first and second faces. One face has a topographic disturbance element arranged between knife edge and longitudinal center axis and shaping the elevation profile of the face. On the opposite face relative to the center plane an opposite elevation profile with contour line is formed. The contour line points of the contour line of the first elevation profile are positioned opposite the contour line points of the opposite contour line on perpendiculars to the center plane. The contour line of the first elevation profile and the opposite contour line are noncongruent. The contour line of the first elevation profile extends transversely to the longitudinal center axis of the base member across the disturbance element and has an ascending line section and a descending line section. A turning point positioned between these line sections is a component of the disturbance element.

Abstract: A fixed-line rotary trimmer head is provided having pivoting posts (line holding mechanisms) which allow folded strips of trimmer line to pivot out of the way when impacting stones, metal posts and the like to reduce wear and tear on the line and reduce line breakage, the trimmer line is loaded from the underside of the trimmer head and follows an approximate 90 degree curvilinear channel so that the distal ends of the line extend out the side of the trimmer head for use, the trimmer head also comprises means for pushing the trimmer line partially out of the channel for ease of use and for removal of unused trimmer line.

Abstract: Fixed-line trimmer heads for rotary trimmer devices and associated methods are provided. A fixed-line trimmer head for a rotary trimmer device includes a housing operatively attachable to the rotary trimmer device. The housing is rotatable when in use around a central axis of rotation and has a top surface extending outwardly from the central axis and facing upward when in use, a bottom surface extending outwardly from the central axis and facing the ground when in use, and a periphery connecting the top surface to the bottom surface. At least one line channel is defined within the housing of the trimmer head having an entrance recessed within the periphery and an exit disposed on one of the top and bottom surfaces, wherein the entrance and exit are each located an equal distance from the axis of rotation.