Abstract: The invention relates to a rotatably driven cutterhead for a vegetation cutter apparatus. The cutterhead includes a housing in which a spool for the cutting filament is rotatably journalled so as to be rotatable relative to the housing. Switching stops are provided which coact with the spool. Latching levers are pivotally mounted in the housing which each have a latching arm which coacts with the switching stops in dependence upon centrifugal force in such a manner that the spool is first in a latched condition and is then in a freely rotatably condition with correspondingly higher centrifugal force. A predetermined length of filament is unwound in the freely rotatably condition of the spool. The latching arm pivots between an outer release position and an inner latching position and is resiliently biased by a spring in the direction of its latching position.

Abstract: A hand-held cordless grass/weed trimmer having a plurality of detachable hub assemblies holding the cutting element by compression, and a rake-like guard member for the rotating cutting element which prevents large size obstacles from entering into the cutting path.

Abstract: A cutting saw includes a cutting saw plate formed by bonding two thin plates having an orbicular shape together. The thin plates are bonded together by bracing or silver-alloy brazing. In fact the cutting saw plate is formed as an assemblage of two thin plates. A sinter including abrasive is formed around the periphery of the cutting saw plate. The sinter is formed in zigzag fashion in the direction of its thickness.

Abstract: An improvement for flail cutter heads so that additional flail can be fed from the device by merely bumping its rotating body on the ground. A pair of disc-shaped cams are readily mounted on the centerline of the body on the opposite radial sides of a spool around which the flails are wound. The disc-shaped cams interact with facing cam followers on the inner surfaces of spool covers forming the major portions of the body so that when the lower cam is moved axially out of contact with the lower follower, by bouncing a downwardly biased, axially mounted bumper member on the ground, the other has already moved axially upwardly in position for engagement with the upper follower. This engagement occurs after a predetermined rotation of the spool. Once the bounce is over, the upper cam moves axially in the reverse direction, disengaging the upper cam follower after the lower cam is in position the contact the lower cam followers after another predetermined of rotation.

Abstract: A meat trimming knife for removing meat from carcasses and an ON/OFF control switch therefor wherein the knife is suspended above a work table by a power supply line which is connected to the knife through an elongated handle that extends generally vertically from the knife and generally parallel to the rotational axis of a ring-shaped cutting blade. In a first embodiment, an electric drive motor is suspended above the work station and the knife blade is rotated by a flexible drive cable connected to the motor by a drive belt and pulleys located within a horizontal housing. Downward vertical movement of the knife will pivot the housing through the connected drive cable to actuate a control switch to operatively connect the drive motor to the cable for rotating the blade. Upon release of the downward pull on the knife a spring or counterweight will pivot the belt housing upwardly to automatically actuate the switch to deenergize the drive motor.

Abstract: A string trimmer with automatic feed including a cap member, a body member and a spool within the body member which has the line wound thereon. When the cap member is contacted with the ground, the cap member is temporarily restrained thereby rotating relative to the body member. The relative rotation of the cap member actuates a mechanism which releases the body member from the spool allowing the body member to rotate relative to the spool thereby releasing a length of line.

Abstract: A cutting device is provided to replace a conventional lawnmower blade which offers improved safety, outstanding grass cutting ability, improved grass bagging suction, and a reduction in the strain on the engine. The device includes an elongated, downwardly curved rigid thermoplastic member having an upstanding airfoil at each distal end. Several elongated flexible tines extend outwardly away and downwardly from the member. The tips of these tines operate to effectively cut the grass while flexing for safety if an object is encountered, such as a rock or toe. The airfoils increase the suction within the mowing cavity to increase the grass bagging efficiency. The downwardly curved configuration presents the tips of the tines for grass cutting while reducing or eliminating the drag of the member on the grass.

Abstract: A string trimmer providing an incremental indexing of line when the head is stopped and started. The preferred embodiment of the string trimmer head includes a spool member within the body member, the spool member being coaxially positioned within the body member and being rotatable therewith. The spool member includes a grooved end face with a cam channel having at least one switchback and one arcuate segment. A connecting means attached to the body member includes a connector which runs within the cam channel. Upon starting the rotation, the connector runs along an arcuate segment of the cam channel (permitting relative rotation between the spool member and the body member thereby indexing a length of line) until contacting a switchback stopping point. The connector is biased to move along the switchback and resets along the switchback upon stopping of rotation.

Abstract: A flexible line trimmer is provided with an automatic line feeding cutting head portion which utilizes a generally U-shaped, centrifugally actuated balancing arm member to maintain the free end cutting length of the line at a predetermined length during trimmer operation. The balancing arm is rotatably mounted within the head by means of a coil spring element which is installed on one of the leg portions of the balancing arm and press-fitted into a plastic pocket portion of the head to serve as a bearing for the balancing arm. The outer end of the spring-carrying leg has a transverse pigtail portion which may be selectively sized to predeterminably vary the controlled cutting length of the line. The opposite leg of the balancing arm, which is engaged by the line during trimmer operation, is received within spool flange notches when the arm is in its line locking position to prevent undesirable bending of the arm due to cutting line forces thereon.

Abstract: A guard for a power trimming device of the type having a rotating cutting element partially enclosed about a short arcuate extent by a housing is formed from a rigid bar having a generally circular configuration with an open front portion formed by outwardly flared ends. A plurality of transverse apertures extend through the bar opposite the open front portion and receive threaded fasteners which secure the guard to the housing. The front portion of the guard allows trimming of brush and other vegetation, but protects fence posts, tree trunks and the like from damage through contact with the cutting element. The guard also provides an additional protection against injury to an operator. In a second embodiment, a compound adjustable bracket is utilized to secure the guard to the trimming device.

Abstract: Powered rotary scalpel structure including a circular scalpel blade secured at one end of a blade support arm connected to a handle having a drive motor secured to the other end thereof and means extending through the handle and the blade support arm for rotating the circular scalpel blade on energization of the motor. The automatic rotary scalpel includes structure for releaseably securing the blade support arm to the handle and a remote switch for connecting the motor to an electrical power supply at the back of the handle from an actuating member from the front of the handle as well as an electric light and an electrical circuit which provides for the light always being on when power is supplied to the rotary scalpel. A circular scalpel blade is also disclosed along with blade protection structure, a support stand for the blade support arm and structure for controlling the depth of an incision made by the rotary scalpel structure along with modifications of the powered rotary scalpel structure.

Abstract: A brushcutter has a guide wand with a drive head rotatably mounted thereon. A motor rotatably drives the drive head and a cutting head for cutting vegetation is mounted on the drive head and defines a rotational plane. A protective arrangement partially overlaps the cutting tool in the region of the rotational plane and has a downwardly extending wall. A detachable skirt extends from the wall downwardly so as to terminate at an elevation beneath the rotational plane and deflects stones and other hard objects caught by the cutting tool thereby protecting an operator of the brushcutter against injury.

Abstract: A deburring tool is provided having two sets of blades for use in simultaneously deburring the inner and outer edges of a piece of tubing, further including adjustment capability allowing the use of the tool in deburring tubing of different sizes, further including a cap recess cleaning tool, a cleaning brush and a base for mounting the deburring tool on a bench, table or the like.

Abstract: A stripping device for wall coverings such as wallpaper comprising a hand-held casing (1) housing an electric motor, a gearbox (2) driving an output boss (3) on which is mounted a concave cutting blade (4) having a peripheral cutting edge. The gearbox (2) is such as to cause the blade (4) to execute an orbital motion in the general plane of the disc. The device is used by pressing the blade (4) gently against the surface to be stripped whereupon the orbital motion in the plane of the surface causes the covering to be stripped.

Abstract: The invention relates to a knife insert for tools with an oscillating head, preferably of the type used for cutting open rubber or adhesive beading strips around windscreens and having a cutting face bounded by one or a plurality of cutting edges. When producing such a knife, in order to be able to use less expensive material and in order to be able considerably to reduce the reciprocating movements of the shank when driven by a tool which performs oscillatory rotary movements, it is according to the invention proposed that the knife be angled over in an L-shape at right-angles to its cutting face, the cutting face forming a first leg of the L, and the second leg of the L which extends substantially at a right-angle from the cutting face comprising a connecting element for connection to an actuating tool.

Abstract: Apparatus for cutting vegetation with a rotatable head carrying a non-metallic cutting line extended into a cutting plane. Additional line is extended from a supply line coil within the head into the cutting plane without independent operation action. A mechanism in the head feeds a certain incremental length of line whenever the free end of the cutting line is reduced to this length by wear, or otherwise. After the cutting line length is extended to its original preset length, the cutting line is secured automatically against further extension from the head. The incremental line feeder mechanism is actuated by sensing an operating condition of the head, e.g., angular velocity of rotation.

Abstract: A portable power tool comprising a support tube connected to an engine by means of an intervening clutch casing, a slider tube slidably fitted to the support tube and spring-biased forward relative to the support tube, a connecting rod connected to a front end of the slider tube and pivotally supporting a cutter holder, a rotary cutter rotatably supported by the holder, a flexible shaft for transmitting a drive force of the engine to the cutter for rotation, a lever mounted on a rear portion of the slider tube, and a wire extending rearward from the lever for connection to the clutch casing, whereby when the lever is pivoted to slide the slider tube relative to the support tube, the holder is pivotally moved to change the orientation of the cutter.

Abstract: A slicing saw blade comprising a substrate disc and a blade edge consisting essentially of a ultra-hard material deposited along a peripheral edge of said substrate disc, said substrate disc being made of a steel consisting essentially of, by weight, not more than 0.10% of C, more than 1.0% but not more than 3.0% of Si, less than 0.5% of Mn, from 4.0% to 8.0% of Ni, from 12.0% of 18.0% of Cr, from 0.5% to 3.5% of Cu, not more than 0.15% of N and not more than 0.004% of S, the sum of C and N being at least 0.10%, the balance being Fe and inavoidable impurities. The saw blade is useful for the production of wafers of a semiconductive material, and has a long service life.

Abstract: Apparatus for cutting vegetation with a rotatable head carrying a non-metallic cutting line extended into a cutting plane. As the line extension decreases from an established preset length an actuator in the head permits additional line to be extended automatically from a supply source within the head. The actuator imposes a back pressure against the line of magnitude correlated to the sensed pull tension wanting to extend the line outward of the head. After the cutting line length is extended to its restored original preset length, the actuator in response to the operational forces imposed thereon secures the cutting line against further extension until a subsequent decrease in line extension is incurred. In one embodiment an inertial drag brake is activated during the course of line feedout and is deactivated after the length of cutting line has been fully restored.

Abstract: A shield for a string trimmer using a rotating flexible cutting element defining a circular perimeter including:a base wall generally parallel to the plane of the rotating cutting element and having a rear portion; andan arcuate rim member extending downwardly from a portion of the base wall, the rim member and the perimeter defining a pair of oppositely directed volute pathways each terminating in an opening, each of said pathways having a minimum width adjacent to the rear portion of the base wall which gradually increases in width from the rear portion to the opening.

Abstract: A cutter head for a grass trimmer is disclosed which has a hole formed in a disc portion for guiding a distal end of a cord from a cord winding portion toward a boss portion and an annular flange portion formed integrally with a circumferential portion of a disc portion on the side of the boss portion. The annular flange portion has a hole through which the distal end of the cord is fed radially outwardly of the disc portion.

Abstract: A cutting head for a cord type mower which severs grass and weeds with cords unwound from a cord spool provided within a bowl-shaped rotary casing and radially projected from the rotary casing by rotating the rotary casing at a high rotating speed. A speed change control mechanism is provided within the rotary casing to control the rotating speed of the rotary casing so as to vary it according to the length of the projecting portions of the cords. When the cords wear and shorten, the moment of inertia of the cutting head decreases; consequently the rotating speed of the rotary casing increases and thereby the cords are fed out automatically by the increased centrifugal force acting on the cords. Then, the engaging members members engaging the speed change control plate are moved radially outward by the centrifugal force to reduce the rotating speed of the rotary casing. Thus, the cords are always projected by a predetermined length from the rotary casing for stable mowing operation.

Abstract: A cord cutter head for use in, for example, a cord cutter type grass trimmer has a housing having which is provided with a downwardly directed opening, and a spool carrying a flexible cutter cord wound thereon. The spool is formed integrally with the housing such that its lower end portion is projected under the housing through the downward opening. The housing has an aperture formed in the wall thereof and adapted to allow the unwound cutter cord to be extracted outside therethrough. The user can rewind the cutter cord from the exposed portion of the spool by his fingers without difficulty.

Abstract: A lawn and bush cutting device comprises a housing mounted for rotation about an axis with a drive shaft fixed to the housing and drivable by a motor for rotating the housing. A wire cylinder is coaxially mounted in the housing and can be held fixed with respect to the housing for rotation therewith. A supply of cutting wire is wound on the wire cylinder, or on a reel rotatably fixed to the wire cylinder. A length of the wire extends out of the housing to act as a cutting tool when the housing rotates. A sleeve member is axially movable in the housing and has helical coupling piece which are coupled to helical piece in the cylinder. Axial movement of the sleeve thus causes relative rotation between the wire cylinder and housing, thus paying out additional lengths of wire from the housing. A ring is axially moveable but rotationally fixed to the sleeve and can be moved downwardly by cable operated member.

Abstract: A cord cutter head for use in, for example, a cord cutter type grass trimmer has a housing having a downward opening, a spool mounted substantially in the center of the housing and carrying a flexible cutter cord wound thereon. An aperture is formed in the wall of the housing so as to allow the portion of the cutter cord unwound from the spool to pass therethrough. The axis of the aperture is offset with respect to the central axis of the housing to the trailing side as viewed in the direction of rotation, thus imparting a bend to the cutter cord.

Abstract: A manually portable rotary debris remover, particularly adapted for clearing tree planting sites, has a remotely mounted, power driven, rotating hub on an extended support, such as a chain saw blade. The rotationally driven hub has a plurality of pairs of coiled tine members, each pair radiating out from a respective tine shaft mounted in the hub equidistantly from the hub axis. The tine shafts are each inclined from 3 to 10 degrees from perpendicular to the plane of rotation of the hub, so that, in rotating, the tines of each pair do not simultaneously strike objects in the path of rotation of the tines when clearing debris.

Abstract: The invention relates to an annular circular saw blade (8) with imaginary center axis and with a plane of symmetry (19) which is perpendicular to the imaginary center axis, an inner rim section (14) with a first drive surfaces (22) provided to work in conjunction, through friction coupling, with second drive surfaces (38) on a rotating drive unit (30); an outer rim section (15) with cutting devices and between them a web portion (16) with an underside (17) and a topside (18), with at least one of the said sides (17, 18) exhibiting at least a first annular bearing surface (25) provided to work in conjunction with a second annular bearing surface (45) on a support element (40, 41) for holding the saw blade in position. According to the invention the said first drive surfaces (22) are provided in a groove (20) in the inner rim of the saw blade.

Abstract: An improvement is provided in a motor drive rotary herbage trimmer whereby a spool that carries a supply of a flexible cord is easily inserted into the trimmer or removed therefrom. The improvement involves a receptacle mounted to the drive shaft of the motor and adapted to hold the spool, a closure member adapted to seal the open bottom of the receptacle, coupling devices which cause the closure member to interlock with the receptacle by turning movement, and a holding bar which can be used to hold the receptacle motionless while the closure member is turned.

Abstract: The invention is a honeycomb core cutting tool wherein a primary cutter is used to cut the core to shape and secondary cutters are used to immediately shred that portion of the core being removed. The primary cutter is typically a commercially available circular saw blade modified by the machining of a plurality of peripherally located, radially inward directed slots dividing the primary cutter into segments which can be formed into a concave shape. A retainer threadably engages the end of the shaft and is used to force the primary cutter against a concave surface of a flange mounted to the shank of the tool, causing the primary cutter to deform into the concave shape. Mounted behind the flange and primary cutter are two "slot" cutters for shredding the portion of the core being removed.

Abstract: In an annular saw force-exerting mechanism (56, 57) is provided so as to act on flange-equipped support rollers (40, 41) for the saw blade (8). The support rollers have at least one flange (44) engaging a groove in the web portion of the saw blade. The force-exerting mechanism acts essentially only in the axial direction of the support rollers essentially parallel to the plane of symmetry of the saw blade towards the centre of the saw blade. Alternatively, force-exerting mechanism is provided so as to act on a drive pulley for the saw blade essentially only in a direction perpendicular to the axis of rotation of the drive pulley, parallel to the plane of symmetry of the saw blade outwards from the centre of the saw blade. In both cases the drive surfaces (22, 38) of the drive pulley and the saw blade are pressed against each other, and the inner edge of the flange on the support rollers is pressed against the inner edge of the groove in the web portion of the saw blade.

Abstract: A flexible line trimmer for cutting vegetation can be converted to a blade cutting device. The trimmer has a motor driven rotatable head with a cavity defined by a wall of the head. The cavity receives a spool wrapped with line. The line has a free end extending through an aperture in the wall of the head. Drive lugs located in the cavity couple the spool to the drive head for rotation. The blade carrier replaces the spool and line. The blade carrier has a central portion that locates within the cavity while the spool is removed. The central portion has at least one drive member that is positioned to engage the drive lugs to rotate the blade carrier with the head. A plurality of blades are mounted to the periphery of the carrier. The carrier is fastened to the head.

Abstract: A cord cutter head for use in, for example, a cord cutter type grass trimmer has a housing having a downward opening, a spool mounted substantially in the center of the housing and carrying a flexible cutter cord wound thereon. An aperture is formed in the wall of the housing so as to allow the portion of the cutter cord unwound from the spool to pass therethrough. The cross-sectional shape of said spool has a longer axis and a shorter axis.

Abstract: A fixed line string trimmer head includes a pair of overlying sheet steel circular plates welded together to form two or more pairs of partially circular passages between the plates opening at each end into a recess extending continuously at and between the periphery of the plates. The passages are formed by recesses formed in the plates in registry with each other while the peripheral recess is formed by outwardly flared portions of the plates. The lower plate is also formed with an integral bulbous or ball portion to guide the trimmer head on the ground during use. The upper plate is provided with a connector sleeve centered with respect to the axes of rotation of the head for attaching the head to a drive shaft. The sleeve has internal threads for this purpose and also to permit an adapter to be utilized to allow the head to be attached to various sized drive shafts.

Abstract: A pair of equal diameter circular plates with a free peripheral edge have aligned apertures for mounting them on the threaded end of an arbor. A chain saw chain rests on the peripheral edge of the plates and tang portions thereof which project between the plates secure the saw chain securely in place when the two plates are clamped together by a nut on the threaded end of the arbor. The blade of the invention which is formed thereby may be used in any application requiring a circular cutter blade and finds particular usefulness as a blade for hand held brush cutters.

Abstract: According to the invention, a pizza cutting device is provided comprising an elongate handle, a cutting wheel with a peripheral cutting edge and a hub having a bore with a central axis and structure for removably assembling the handle with the cutting wheel so that the cutting wheel is guidingly rotatable relative to the handle about the hub central axis. The handle has spaced bearing surfaces which stabilize the device during use.

Abstract: Improved guard and blade assemblies for a rotary cutting machine; wherein the guard has a full rear skirt, and an apertured front skirt of three designs of guard element mounted in cantilever; and wherein the cutter blade is of the swivel type but with retention means for the cutter blade designed to warn the operator of swivel blade pivot failure and with the blade being replaceable without need to disassemble the cutter head; the cutter blade has apertures for adjustable weighting of the swivel blade to provide a variable moment arm; an improved design of replaceable blade tip is also proposed for propeller-type and swivel-type blades.

Abstract: This invention provides a can opener blade wherein the two primary sides forming the bevelled cutting edge have a certain angular relationship with the centerline of said blade; the blade of this invention has certain advantages over known can opener blades.

Abstract: A light weight portable hand-held apparatus for cutting and trimming vegetation, hedges, trees and the like and which is provided with a rotatable blade housing having a plurality of cutting blades, said blades being square-shaped or U-shaped in configuration and each blade having a plurality of cutting edges. A shroud designed for efficient entrainment of cuttings to a storage area and for providing protection from flying debris which may result by the cutting action of the blades. The cutting apparatus is provided with a self-contained receptacle for collecting the cut vegetation and branches, said receptacle being designed for easy emptying. The unique cutting blades used herein result in the cuttings being transformed into a fine residue which increases the collecting volume capacity of a self contained collection receptacle. The cutting apparatus is provided with a safety switch which requires both of the user's hands to be on the apparatus for safety during operation.

Abstract: A lawn mower having a housing and a cutter unit positioned below the housing. The cutter unit comprises an upper rotating cutting unit and a lower stationary cutting unit that is concentric with the upper cutting unit and which have a plurality of upper and lower blades at their borders. Each blade has a cutting surface with a near end close to the border, and a far end away from the border. The blades of the upper cutting unit extend in front of a line passing through the concentric axis and the near end, in the direction of rotation of the upper cutting unit.The upper blades rotate and slide over stationary lower blades, thereby cutting the lawn in a manner similar to a pair of scissors. The angle between the upper and lower blades is preferably 16-20 degrees.

Abstract: A vegetation cutting apparatus of the filament type comprising a cutter head including a spindle adapted to be rotatably driven, a keyway in the spindle extending axially of the spindle, and a key member carried by the spindle and slidably movable in the keyway. A clutch means is coaxially mounted on the spindle, and a filament storage spool is mounted on the spindle, the spool being carried by and lying radially outwardly of the clutch means, whereby the clutch means and the spool rotatably move as a unit. A spring means normally biases the key member into driving relation with the clutch means whereby normally the spindle rotatably drives the clutch means through the key member to rotatably drive the spool.

Abstract: An apparatus for simultaneously cutting and beveling plastic pipe such as water or sewer pipe is described. This apparatus includes a rotatable cutting head on which inclined and protruding cutting edges are provided to cut and bevel the pipe. The cutting head is mounted in a housing the lower surfaces of which include two convex pipe engaging regions positioned on either side of the cutting head which are contoured to contact the pipe and maintain the cutting head in proper cutting and beveling relation to the pipe when the housing is moved laterally or angularly relative to the pipe. Concave pipe engaging regions flank the convex regions to maintain the housing in contact with the pipe. The cutting bits are tapered to aid in retaining them in position in the cutting head.

Abstract: In a cutting head for an electric-motor-driven filament-type cutter the automatic adjustment of the length of the filament is effected in that intermittently a rotational movement occurs between a filament spool (36) and a sleeve (24) mounting said spool for axial displacement. The sleeve (24) is provided on the outside with locking cams and the filament spool on the inside with cams cooperating therewith. The sleeve (24) can be pushed in by hand against spring pressure to cancel the intermittent locking. For automatic filament adjustment a centrifugal adjustment is provided. For this purpose at least two radial ball slots (40) are provided between the housing portion (14) and a radial extension (48) of the sleeve (24) and in the ball slots balls (44) are guided which are adapted to be urged outwardly by centrifugal force.

Abstract: A guard for a grass and weed trimmer of the line-cutting type, the guard having a body attached to a handle. A rotatable head mounted to said handle flailing the line in a plane of rotation around an axis of rotation. The body has a skirt extending partway around the axis, a cut-off blade in the path of the flailing line to cut-off excess line, and a deflector downstream from the blade to deflect the cut-off segments away from the plane of rotation, toward the ground.

Abstract: A cutterhead is disclosed for a motor-driven vegetation cutter and has a rotating housing and a spool journalled therein on which a cutting filament is wound. The spool has a plurality of cams, which coact with at least two spring-loaded coupling members pivotally mounted on the housing for paying out the cutting filament in incremental lengths. Each of the coupling members is pivotally journalled on its own pivot mount on the housing such that it is pivotable in dependence upon centrifugal force. The pivotable coupling members are synchronously displaceable and are coupled to one another for this purpose via an intermediate ring which is supported on the housing so as to be freely rotatable with respect thereto.

Abstract: A cutting head for a lawn trimmer is provided and consists of a cylindrical housing block bolted to a lower portion of the lawn trimmer so that the housing block is rotatably mounted thereto. A flexible cord with a knot at center of the cord is placed within an opening of the housing block with ends of the cord extending outwardly through each of a pair of opposed holes at side of the housing block. When the lawn trimmer is turned on the knot will retain the cord within the block. In another form a sleeve is mounted securely on the cord to retain the cord in the block.

Abstract: A bump-actuable filament feed for vegetation trimmers; when the cutting length of filament breaks or wears short, the user without interrupting cutting simply bumps the cutting head on the ground deploying a fresh cutting-length of filament. Bumping causes a spring-restored spool latch to yield an increment of spool rotation, feeding a corresponding increment of filament from the spool. For replenishing the filament supply when exhausted, the spool snaps out in one embodiment on pressing a button, and a fresh spool as easily snaps into place.For applications in which bumping the cutting head against the ground is not desired an analogous operation is provided by adaptation of the basic structure.

Abstract: An improved cutting member for a rotary trimmer. The cutting member is formed of a flat link chain, so the cutting member is flexible throughout its length. Alternate links are somewhat wider, and may be sharpened on their edges for better cutting. A hardened wear member is at the ends of the cutting member both to receive the hard wear of cutting against hard surfaces and to provide a more massive end to assist in holding the cutting member out during operation.

Abstract: A radially short upstanding sleeve member is provided and includes an upper end releasably mounted from a rounded base portion of a sector-shaped debris shield of a line trimmer. The lower end of the sleeve member is loosely telescoped downwardly over the upper end of the line reel head of the line trimmer and an intermediate length portion of the sleeve member includes an inwardly projecting corrugation functioning to stiffen the sleeve member against radial deformity. In addition, the corrugation serves to allow lateral deflection of the lower end of the sleeve member relative to the upper end thereof and the corrugation projects closely inwardly over the upper end of the associated line reel head. Further, the upper end of the sleeve member is mounted from a depending flange portion of the base portion of a sector-shaped debris shield of the line trimmer through the utilization of a resilient spacing member.

Abstract: Disclosed is an improved cutter that finds principal utility in, but is not limited to, lawn mowers of the type in which a cutter blade is rotated about an upright axis by a power source such as an electric motor, internal-combustion engine, etc. The disclosed improvement involves a blade that produces a slicing rather than a shearing action, accomplished by a blade design having diametrically opposed end portions, each sharpened to provide a slicing edge that is directed from a leading edge portion to a trailing edge portion, thus providing a blade of increased efficiency and requiring lower consumption of horsepower. The slicing edges may also be combined with conventional impact cutting edges.

Abstract: A mowing machine is provided with its cutting head employing one or more flexible cutting lines such as Nylon cords which serve to cut grasses during rotation of the cutting head. The free end portions of the cutting lines extend radially outwardly from a casing through openings in an annular inertai shifter which is housed in the casing for vertical and angular movements relative to the casing.