Abstract: A durable one-piece vegetation trimmer head molded from a polymeric material provides ease in attachment and removal from standard vegetation trimmers. The trimmer head is fitted with three rotatable, rigid blades which extend during use. The trimmer head has a spool-like shape and includes a central channel having a conically-shaped opening along the bottom surface to assist the operator in attachment and removal of the trimmer head from the trimmer drive shaft. The preferred embodiment provides for threaded attachment to the trimmer drive shaft and in one alternate embodiment the trimmer head includes a pair of opposing spring grooves. In another alternate embodiment, various flexible trimmer line configurations can be fitted into a two-piece trimmer head which is threadably joined. A rigid trimmer blade is also disclosed which is formed from stainless steel.

Abstract: Apparatus for trimming grass around a sprinkler head. The apparatus comprises a body rotatable about a vertical axis and having a bore for fitting over a sprinkler head during rotation thereof and a peripheral portion surrounding the bore. At least one cutter attached to the peripheral portion and comprising a wire having an end portion defining a cutting blade and preferably an intermediate portion formed into a coil defining a spring which allows protective movement of the cutting blade when an obstacle is encountered. The cutting blade extends downwardly at an angle relative to the rotational axis, preferably radially inwardly.

Abstract: A rotating spool with walls (10t and 10b) so close together that the cutting filament (18) cannot wrap over on top of itself. The spool has flail anchors (14) at the spool walls' (10t and 10b) periphery. A spacer (20) between spool walls has the filament (18) wound on to it and is so shaped that the filament (18) has a larger distance from center of rotation between flail anchors (14) than it has nearest the flail anchors (14). The filament (18) is loaded onto the spool by inserting one end of the filament (18) into the loading hole (18h) until it emerges from between spool walls (10t and 10b), then drawn taut, then laced inside flail anchors (14) until the filament (18) is wound up on the spacer (20). And the flail (16) is ready to cut vegetation.

Abstract: An apparatus for cutting vegetation that includes a fixed gearhead from which a rotating driveshaft extends. A spool, including a spool housing and a spool element, are located below the gearhead and are coupled to the drive shaft to rotate in unison with the drive shaft. A cylindrically shaped deflecting ring extends between the top of the spool housing and the adjacent rotating protective disk. The deflecting ring prevents cut vegetation from winding around the portion of the driveshaft that extends between the gearhead and the spool.

Abstract: An elongated flexible cutting string, or substantially self-supporting strut cutting element, is connectable to a rotating device for use in a method of cutting vegetation. The cutting string has numerous advantages over conventional cutting strings, having a drag coefficient which is at least about 5% (e.g. 10-300%) less than the drag coefficient of a string having a substantially round and smooth cross-section. The drag coefficient of aerodynamic line 10 is 1.0 or less, e.g. about 0.35 or less. The cross-sectional configuration preferably simulates a tear drop (with or without an extension nose), and can have a textured (e.g. with golf ball simulating dimples, saw toothed or a wavy configuration) exterior surface. The pitch of the line is positively maintained while it is rotated in a cutting plane, e.g. controlled with an eyelet and/or a compound taper. Other cross-sectional configurations are an ellipse of at least 1.

Abstract: A string trimmer head and head assembly include a plurality of arms which connect the head to a hub member. One or more flails are captured between the head and the hub member and extend outwardly into a cutting plane.

Abstract: A string trimmer head having a frame and a flexible cutting member attached to the frame. The frame is a one-piece member with two hook sections on opposite sides of the frame. The hook sections each have a receiving slot with an entrance facing towards a substantially closed bottom side of the frame and a closed end at a substantially open top side of the frame. In one embodiment the receiving slots have different widths to accommodate attachment of different diameter flexible cutting members to the frame. In another embodiment, the frame is adapted to have either one flexible cutting member attached to it or two flexible cutting members attached to it with the flexible cutting member(s) extending from the frame in uniform patterns in either arrangement.

Abstract: A rotary knife having a blade with an annular body rotatable about a central axis and an annular blade section projecting away from the body. The blade section comprises a first radially inner surface, a second radially outer surface and, a cutting edge defined along the projecting end of the blade section and extending about the central axis. The cutting edge defines a sinuous line extending about the central axis forming first curved segments having radii of curvature centered radially inwardly from the edge, second curved segments interposed between adjacent first segments and having radii of curvature centered radially outwardly from the edge, and a blade edge curvature inflection location between each adjacent first and second segments.

Abstract: A ground guide system for a trimming head of a powered vegetation trimmer, which may be of the type having a rotatable drum enclosing a spooled trimming cord and a bump feed mechanism on the bottom of the drum, comprises a housing above the drum, a hollow hub mounted within the housing and coupled to the drum for driven rotation therewith, an elongated mounting shaft slidably received within an axially extending sleeve fixed within the housing for upward and downward axially-directed motion, a spring for resiliently biasing the mounting shaft in a downward axial direction, and a ground guide threadably attached to the mounting shaft below the bump feed mechanism for adjusting trimming height. The mounting shaft includes an actuating ring arranged to operatively engage the bump feed mechanism incident to bumping the ground guide against a rigid environmental surface to restore a free end of the trimming cord.

Abstract: A rotary cutting blade including an elongated body made of steel and having opposite ends, a leading edge extending from each opposite end, an upper surface, a lower surface and a cutting surface extending between the upper and lower surfaces along a portion of the leading edge, and a laser hardened portion extending from an opposite end of the body along the lower surface and the leading edge, the laser hardened portion having a thickness extending toward the upper surface and to the cutting edge.

Abstract: A string cutter head for weed trimmers comprises a solid seamless hub having an upper disk and a lower disk. The lower disk comprises at least two pairs of vertically drilled holes for installation of a monofilament cutting string. The upper disk acts as a spacer from the trimmer housing to allow installation and removal of cutting string without removal of the cutting head from the weed trimmer. Several holes of different diameters may be used for different diameter strings. The hub comprises a threaded connection for attachment to the shaft end of the trimmer. In the preferred embodiment, the hub is machined from aluminum alloy.

Abstract: A cutting head for a string trimmer is provided which accommodates any string gauge thickness and may be easily and quickly re-threaded upon failure of a string previously disposed therein. Clamping members are provided to clamp the strings within the cutter head, with the clamping force being provided by springs and centrifugally generated moments. The clamping members are capable of generating two degrees of clamping force. The lesser degree of clamping force can be overcome by a string forcibly inserted into the cutting head.

Abstract: A cutting head for a string trimmer is provided which accommodates any string gauge thickness and may be easily and quickly re-threaded upon failure of a string previously disposed therein. Clamping members are provided to clamp the strings within the cutter head, with the clamping force being provided by springs and centrifugally generated moments. The clamping members are capable of generating two degrees of clamping force. The lesser degree of clamping force can be overcome by a string forcibly inserted into the cutting head. Alternatively, the clamping members can be formed to pinch the string, with a constant degree of pinching force being applied to the string.

Abstract: A cutting attachment for a rotary cutting apparatus wherein the cutting attachment has a substantially rigid body and a plurality of cutting members. Each cutting member has a blade portion and a head portion. An aperture extends through the head portion of the cutting member for connecting the cutting members to the substantially rigid body of the cutting attachment such that, in a connected position, the blade portion of the cutting member extends outwardly from the substantially rigid body of the cutting attachment. The cutting attachment further includes a brake assembly for reducing the speed of rotation of the cutting members when the cutting members are rotated in response to actuation of the rotary cutting apparatus.

Abstract: A circular brush cutting blade with peripheral cutting teeth. Segments are bent or deflected out of the blade body at an angle to the plane of the blade less than normal. The segments are configured to provide an inclined leading edge for each segment that cuts a laterally extended path with movement of the blade laterally or axially. The segments produced by folding the segments around a base line or juncture with the blade body whereby the opening through the blade created thereby is radially outward of the juncture.

Abstract: This is a grass remover to remove grass from the surface of an area in a circular path about the top of a guide hole in which a termite bait station may be inserted. This includes a circular skirt with a hub in the middle and a plurality of cutting blades sharpened at the lower end and carried between the hub and the skirt. A guide cylinder is fixed to the hub and extends downwardly into the guide hole. A stem extends upwardly from the hub and is of a character to fit into the chuck of a hand drill. Operation of the hand drill when the guide cylinder is in the guide hole causes the grass to be removed from the circular area about the top of the guide hole.

Abstract: A cutting attachment for use with a vegetation cutting device. The cutting attachment has a body with a generally planar coupling portion and a central axis of rotation. In one embodiment, the body further includes a conical central wall portion extending radially outwardly and in a first direction from the coupling portion and the axis and a circular outer wall portion adjoining the central wall portion and extending generally radially outwardly therefrom. The central wall portion defines a conically-shaped self-cleaning inner cavity disposed symmetrically about the axis. The outer wall portion has a generally smooth outer surface which serves as a skid plate. An outer self-cleaning cavity is formed by an outer surface of the central wall portion and an inner surface of the outer wall portion. A coupling assembly, which can include an adapter having first and second clamping elements, is carried by the coupling portion for coupling the body to the cutting device to cause rotation about the axis.

Abstract: A durable one-piece vegetation trimmer head molded from a polymeric material provides ease in attachment and removal from standard vegetation trimmers. The trimmer head is fitted with three rotatable, rigid blades which extend during use. The trimmer head has a spool-like shape and includes a central channel having a conically-shaped opening along the bottom surface to assist the operator in attachment and removal of the trimmer head from the trimmer drive shaft. The preferred embodiment provides for threaded attachment to the trimmer drive shaft and in one alternate embodiment the trimmer head includes a pair of opposing spring grooves. In another alternate embodiment, various flexible trimmer line configurations can be fitted into a two-piece trimmer head which is threadably joined. A rigid trimmer blade is also disclosed which is formed from stainless steel.

Abstract: A cutting tool for use with a brush cutter, trimmer or like device (1) for cutting thicket, grass and like vegetation, wherein the device includes a rotary shaft (3) for receiving a cutting tool which includes a rotatable center disc (6) which can be fitted to the tool and which includes cutting blades (9) having a cutting edge (10) along the front side of the blade as seen in the direction of rotation, wherein each individual cutting blade (9) is bent down through a first angle (v) such that the rear edge of the cutting blade (9) will be located closer to the ground than the edge-provided front side (10) of the blade when the center disc is held parallel with the ground, so that as the centre disc (6) rotates air will be pressed down towards the ground and therewith causes the tool to hover or lift slightly above the ground surface.

Abstract: A head suitable for use on any weed cutter, regardless of whether it has a left-hand or right-hand threaded shaft. The head includes, in order from top to bottom, an arbor enclosing an elongated hexagonal nut with internal threads to engage the shaft of a weed cutter, a line holding plate, two cutting lines, a tension plate, a tightening knob and a bolt held by the knob and threaded into the hexagonal nut.

Abstract: A trimmer (10) has a power source (12) and a tabular drive shaft housing (32) for coupling the power source (12) to a rotating working element. The drive shaft housing (32) is rotatable with respect to the power source (12) and a handle (26) which is fixed to the power source, such that rotation of the drive shaft (32) allows the plane of the working element to be re-oriented. Rotation of the drive shaft housing is fixed by a coupling latch (38) disposed within the handle. An external trigger (46) located on the handle is provided for manually decoupling the coupling latch for allowing rotation of the handle.

Abstract: A process for forming flexible cutting line for use in rotary vegetation trimmers of the type having two or more monofilament lines mounted on a common spool. The line produced by the process of the present invention defines two monofilament strands joined together in a side by side relationship by a severable bond. The process includes the steps of extruding one or more pairs of molten monofilament strands in proximate disposition, directing the strands together in a cooling quench bath, pulling the strands in an adjacent abutting disposition through the quench bath to initiate the crystallization and bonding together of the two strands, concurrently stretching and heating the bonded strands to effect parallel alignment of the molecular chain in the strands, heating the strands in a relaxed disposition, wetting the strands and spooling the wetted strands for storage and transportation.

Abstract: The apparatus for cutting plants includes a rotatable spool (18) having a central hub (29) and a plurality of axially spaced-apart disks (23,24,25) extending from the central hub so as to define at least one winding chamber (26,27); at least one winding (19,20) around the central hub in the at least one winding chamber (26,27) including at least one cutting filament with a free end extending radially outward through at least one radial opening (13,15) in the cup; a cup (16) nonrotatably connected with a drive shaft (14) in which the spool (18) is rotatably mounted; and a device for readjusting the cutting filament to a predetermined length when the cutting filament has been shortened due to wear including an elastic ring (30,40) for each winding, which encompasses and presses together the winding during cutting at normal rotational speed and a device for rotating the drive shaft and cup at an elevated rotational speed relative to a normal rotational speed used during cutting.

Abstract: A line trimmer head is provided including a rotatable drive shaft and a housing mounted to the drive shaft for rotation therewith. The housing has an open end and at least one peripheral aperture formed through the housing. A spool subassembly is positioned at least partially within the housing adjacent the open end of the housing. The subassembly includes a spool having at least one flange extending radially outwardly from the periphery thereof, a cog ring secured to the spool, and a ratchet and pawl assembly formed between the cog ring and spool. The ratchet and pawl assembly allows rotation of the spool in a first direction with respect to the cog ring for winding line around the spool while preventing spool rotation in a second direction opposite the first direction to facilitate line feed bumping and line trimming operations. In an alternative embodiment, the pawl is integrally molded with the spool to eliminate the separate spring-pawl assembly.

Abstract: A rotary cutter head assembly comprises a cutting element including a substantially spherical enlarged retaining portion, a filamentary flexible elongate cutting portion, and a substantially cylindrical intermediate strengthening portion, which is integral with and between the retaining portion and the filamentary portion and is of smaller cross-sectional area than that of the retaining portion, and a head including a first flange which is substantially planar, a second flange which is substantially planar and which extends substantially parallel to and is spaced from the first flange so as to define a channel between the first and second flanges, in which channel the retaining portion of the cutting element is releasably and pivotally retain.

Abstract: A hand-held working tool has a motor housing and a motor with output shaft positioned in the motor housing. A clutch housing is connected to the motor housing. A centrifugal clutch is positioned in the clutch housing. A drive shaft with a first and a second end is provided. The centrifugal clutch detachably connects the output shaft to the first end of the drive shaft. The centrifugal clutch has fly weights connected to the output shaft and a clutch drum connected to the first end of the drive shaft. This clutch drum surrounds the output shaft and the fly weights. A cutting element is connected to the second end of the drive shaft. A protective tube having a proximal end connected to the clutch housing and a distal end connected to the cutting element is provided. The drive shaft is enclosed in the protective tube. A bearing element is positioned at the first end of the drive shaft. Radial play is provided between the bearing element and the first end of the drive shaft.

Abstract: A hand knife is disclosed comprising a handle assembly, a ring-like blade housing carried by and projecting from the handle assembly, a ring blade carried by the housing, a blade drive transmission, and a blade retention assembly. The housing defines an annular blade receiving groove opening in an axially facing side. The ring blade is supported in the housing with a cutting edge projecting from the groove. The blade retention assembly comprises a flexible blade keeper extending along the axially facing housing side and about the blade and a connector for securing the blade keeper to the housing and handle assembly. The keeper is disposed in supporting relationship with the blade along the housing face diametrically opposite the handle assembly. The keeper flexes to facilitate ring blade removal and replacement.

Abstract: An aerodynamic cutting string for use with such devices as flexible line trimmers and the like. The string incorporates a number of embodiments which eliminates or greatly reduces the drag, fluttering and force imbalances which are created as a result of the pressure differential and wake which are formed behind the flexible line as it moves. This accomplishment is achieved by employing an aerodynamic profile for the line which lowers the coefficient of drag and reduces the forces created by the air foil.

Abstract: A cutting head for a string trimmer is provided which accommodates any string gauge thickness and may be easily and quickly re-threaded upon failure of a string previously disposed therein. Clamping members are provided to clamp the strings within the cutter head, with the clamping force being provided by springs and centrifugally generated moments. The clamping members are capable of generating two degrees of clamping force. The lesser degree of clamping force can be overcome by a string forcibly inserted into the cutting head.

Abstract: In a mowing nylon cutter comprising a nylon cord, the nylon cord holds agricultural chemicals. The nylon cord is formed, for example, in such a manner that a nylon and a crystal technical product of agricultural chemicals are mixed and the mixture is extruded. When this nylon cutter is used, the agricultural chemicals held in the nylon cutter directly contact with and adhere to stalks remaining after the weeds are mowed simultaneously with the mowing of weed. Namely, the agricultural chemicals can be applied effectively simultaneously with mowing.

Abstract: A cutting attachment is provided having a first body member, a second body member and a plurality of pins spaced an equi-distance apart for connecting the first body member to the second body member to form a rigid body wherein at least a portion of the first and second body members are spatially disposed a distance apart, each of the pins having a bearing surface substantially corresponding in length to the distance between the first and second body members.

Abstract: A high speed hand tool includes a saw disc having less than ten teeth, preferably four. Each tooth has a radial flank, which preferably inclines forward in the cutting direction, and a tangential flank, which has a small clearance angle. The teeth may have a greater thickness than the disc itself which thickness, in that case, diminishes in a direction opposite to the direction of rotation. Alternatively, the teeth may be offset alternately to the right and the left. The invention also comprises an adjustable protective device which enables setting the depth of a perpendicular saw cut.

Abstract: A TDMA system with a TDMA frame format that requires no guard time, or with a maximum guard time of one clock cycle of the high timing base is applied to a network with a fixed central base, or headend, and remote units, called Premises Interface Devices (PIDs), which have a fixed communication media, such as a cable, between the headend and PID. This TDMA system is particularly useful for increasing system efficiency for CATV applications. The system method works as follows: a remote PID attempting to access the system sends a short data burst to the headend. By measuring the time difference between the time reference and the beginning of the uplink signal received, the headend will send timing correction/adjustment information to the PID. The PID then adjusts the timing of its data bursts, optionally sends a trial message and, once a verified correct transmission is acknowledged by the headend, sends regular data.

Abstract: A coated monofilament comprising a polymeric monofilament and a coating of an amide melamine wax. The coated monofilament exhibits excellent lubricative and wear characteristics and can be reprocessed without adversely affecting the physical properties of the polymeric monofilament. A process for producing the said coated monofilament is also disclosed.

Abstract: Multifunctional blade designs for rotational oscillating cutting include, in one aspect, different cutting teeth segments and cutting agent segments arranged along separate portions of a common cutting edge to carry out various cutting tasks. In another aspect, non-circular cutting blades have separate cutting edge segments, each segment having different cutting teeth or cutting agents. The blade edge may include one portion having grit bonded to the cutting edge to cut hard objects, and another portion having cutting teeth for cutting softer objects. Likewise, the blade edge may include two portions, each having cutting teeth of differing size and pitch to cut differing materials. Another embodiment comprises a triangular blade, the sides of the triangle provided with cutting grit bonded to the edges. Alternatively, at least one side of the triangle may include cutting teeth, so that each side of the triangle is adapted to cut different types of materials.

Abstract: A rotary knife blade comprising an annular body rotatable about a central axis, gear teeth projecting away from the body to form a ring gear, and an annular blade section projecting away from the body. The blade section comprises a first frustoconical, radially inner surface, a second frustoconical, radially outer surface, a third annular surface extending between the first and second surfaces remote from the body and an array of shallow flutes formed in the blade section. The flutes are disposed circumferentially about the blade section, extending from the projecting blade section end toward the body and opening in the first and third surfaces. The junctures of the third surface with the first surface and the flutes define a cutting edge.

Abstract: In order to provide a rotating trimming line (10) for brush cutters (100) equipped with a driving motor (119) which sets the rotating trimming line (10) that is clampingly secured with one end (13) into rotational movement, in which case the rotating trimming line (10), by virtue of the centrifugal force, extends essentially toward the outside and the rotating trimming device (10) is constructed in such a way that, in relation to its longitudinal axis (L), it possesses a varying position of the cross-section, with which, even at a high speed of rotation or at a high number of revolutions per unit time of the rotating trimming line, a substantial noise reduction can be achieved in comparison with the known rotating trimming line embodiments, which is simple to manufacture and which possesses a great stability, it is proposed that the rotating trimming line (10) possesses a radially symmetrical, viz.

Abstract: A line trimmer head includes a line feed configuration which facilitates reloading the head with new line without requiring removal of the spool from the housing. Line is sequentially fed first into the housing through a peripheral opening in the housing, through a guide channel in the spool, and then out of the housing beyond a lower flange of the spool through an opening in the hub of spool. Finally, the line is fed into a small opening in a spool flange to secure the line with respect to the spool. Rotation of the spool inside the housing then causes line to be drawn into the housing through the peripheral opening and wrapped around the spool. The spool provides separate storage compartments for different lines. Additional payout of line is provided when a bump knob is bumped on a ground surface.

Abstract: A cutting head member for a vegetation trimmer such as a lawn edger or hedge trimmer has a rotatable blade holding jig journalled between two disc-like members clamped by a bolt onto a rotary shaft drive mechanism. The rotatable blade in one embodiment comprises a quick change removably mounted nail. The preferred embodiments provide an option of mounting either a rigid steel cutting blade or a string cutting blade.

Abstract: A line trimmer head is provided including a rotatable drive shaft and a housing mounted to the drive shaft for rotation therewith. The housing has an open end and at least one peripheral aperture formed through the housing. A spool subassembly is positioned at least partially within the housing adjacent the open end of the housing. The subassembly includes a spool having at least one flange extending radially outwardly from the periphery thereof, a cog ring secured to the spool, and a ratchet and pawl assembly formed between the cog ring and spool. The ratchet and pawl assembly allows rotation of the spool in a first direction with respect to the cog ring for winding line around the spool while preventing spool rotation in a second direction opposite the first direction to facilitate line feed bumping and line trimming operations.

Abstract: A filament trimmer comprises a lower housing, an upper handle and a single handle tube connecting the two together to form a completed trimmer. The handle tube has approximately the same length as the length of the lower housing, and the upper handle has approximately the same width as the lower housing, to allow the three-part construction of the trimmer to be packaged in a box of minimum size. The upper end of the lower housing has an S-shaped cord channel, with an adjacent open chamber or space next to and below the cord channel, such that the electrical cord passing downwardly into the lower housing from the handle tube will naturally form a downwardly protruding loop that is easily received in the lower housing when the handle tube is pushed down into the lower housing during assembly.

Abstract: An improved flail release mechanism in rotary mowers heads, to be used for all kinds of vegetation, has a head of which has a flattened part to improve the engagement with the ground, and a release mechanism which comprises a ring member so designed to enable the release of different lengths of flail.

Abstract: The instant device consists of a circular top plate made of ALMAG 35 aluminum and magnesium alloy material with a centerhole and three through holes near its rim and 120.degree. apart from one another into which three cylindrically shaped pins have been tightly pressed. Three identical beveled metallic blades with rounded holes in them are swivably received one each by the pins. A circular bottom plate also made of such ALMAG 35 material has a centerhole and three broken holes for receipt of the bottoms of the pins when the device is fully assembled plate to plate and held with a bolt and nut from below the bottom plate via the centerholes and adapter means to the rotatory head of a motorized brush cutting unit.

Abstract: A rotary cutting head adapted for attachment to a conventional line trimmer including a cutting disk having a circular plate and a peripheral side wall integral with the circular plate. The peripheral side wall has a pair of integral gussets, each having a pair of radial bores passing therethrough. A flexible cutting filament is frictionally engaged within each pair of radial bores such that one end of the cutting filament extends outwardly from the peripheral side wall.

Abstract: A blade assembly for a lawn edging machine. The blade assembly includes a hub, at least two spaced-apart blade members having two or more blade arms extending radially therefrom, and a horizontal blade member connecting the two blade members at their radially extended arm ends.

Abstract: A cutting head for a cord-type mower driven by an engine is disclosed. The cutting head includes a rotor capable of rotating about an axis and a bobbin with a cord wound on it. The bobbin can rotate relatively to the rotor about the axis in the rotor. The cutting head includes two types of cord feeding systems. The first cord feeding system automatically feeds a cord in response to cord wear. The second cord feeding system feeds a cord in response to a manual tapping operation executed during driving of the cutting head. The second cord feeding system disconnects one of the bobbin and rotor from the engine in response to the tapping operation.

Abstract: A cutting line for grass trimmers, lawn mowers, and edgers of the type having a rotating head. The cutting line includes a carrier formed from a polymeric material and an inorganic grit material impregnated within the carrier. Preferably, the grit material makes up between about 6-15% by weight of the cutting line and has an average size of between about 120 to 240 mesh. The grit material may be silicon carbide, aluminum oxide, or silica. The polymeric material is preferably nylon. The carrier may also include a coupling agent and/or a heat stabilizer.

Abstract: A cutting head for a cord-type mower driven by an engine is disclosed. The cutting head includes a rotor capable of rotating about an axis and a bobbin with a cord wound on it. The bobbin can rotate relatively to the rotor about the axis in the rotor. The cutting head includes two types of cord feeding systems. The first cord feeding system automatically feeds a cord in response to cord wear. The second cord feeding system feeds a cord in response to a manual tapping operation executed during driving of the cutting head. The second cord feeding system disconnects one of the bobbin and rotor from the engine in response to the tapping operation.

Abstract: A cutting head for a cord-type mower driven by an engine is disclosed. The cutting head includes a rotor capable of rotating about an axis and a bobbin with a cord wound on it. The bobbin can rotate relatively to the rotor about the axis in the rotor. The cutting head includes two types of cord feeding systems. The first cord feeding system automatically feeds a cord in response to cord wear. The second cord feeding system feeds a cord in response to a manual tapping operation executed during driving of the cutting head. The second cord feeding system disconnects one of the bobbin and rotor from the engine in response to the tapping operation.

Abstract: A blade cover for a rotary blade weed or grass cutter is formed with a body adjustably fixed to a bracket provided on the operating shaft. Either the bracket or the attachment part is provided with long holes extending slantingly downwards to the main body and bolts are inserted into these long holes and fastened so that the position of the attachment part on the bracket is changeable.