Abstract: A blade for a vibratory cutter having a plurality of serrated teeth. A plurality of first teeth provided on one side of the center line of the blade are angled in one direction, and a plurality of second teeth provided on the second side of the center line are equally angled to the first set of teeth in the opposite direction. When used in conjunction with a vibratory tool, the blade will sever material in two directions parallel to the surface endeavored to be cut.

Abstract: A foliage trimmer has a housing centered on an axis, rotatable thereabout in a direction, and formed with a radially open eye. A spool rotatable in the housing carries a supply of a cutting line having a free end extending from the housing through the eye thereof. The spool has an outer periphery formed with at least one radially outwardly open recess or notch. A latching pawl has one end pivoted in the housing adjacent the eye about an axis parallel to the housing axis and an opposite end radially engageable in the notch and angularly offset from the pivoted end relative to the housing rotation direction. This element is displaceable as described above between an inner position with the opposite end in the notch to inhibit rotation of the spool and an outer position with the opposite end clear of the notch and the spool being rotatable. The line passes radially outward around the opposite end and radially inwardly engages same.

Abstract: A trimmer having a pivotally adjustable handle tube for selectively changing the cutting angle of a trimming cord with respect to the handle tube, thereby permitting the trimming of grass, brush, weeds and the like from underneath normally inaccessible or difficult to access areas. The trimmer comprises an elongated handle tube having a handle at an upper end for grasping by an operator and pivotally mounted at a lower end to a motor housing for carrying a motor which rapidly rotates a trimming cord. The handle tube and motor housing support at least one locking pin for releasable engagement between selected teeth of a rack to releasably fix the angular position of the handle tube relative to the motor housing.

Abstract: A cutter blade device of a mowing machine including a casing, and an inertia shifter has at least one pawl member formed at one of the inertia shifter and casing, and at least one receiving portion formed at the other of the inertia shifter and casing. The pawl member is engageable with the receiving portion to restrict a rearward movement of the inertia shifter with respect to the rotary casing.

Abstract: A holder for releasably securing an elongated bar, e.g. a cutting blade, to a drive-means comprises: (a) a holder body adapted to be connected to the drive means and having a substantially flat outer face for guiding and holding the bar; (b) an engaging means biased outwardly from the flat outer face to engage a hole in the bar; and (c) a wall spaced apart from and opposing the flat outer face and connected thereto by a spacing means to form a guiding recess for the bar formed along a longitudinal side edge of the flat outer face and having openings at both longitudinal ends of that face. An elongated cutting blade can be adapted to fit in this holder and the blade-holder combination is especially useful on rotary lawn mowers. The blade is quickly and easily released from the holder for sharpening or replacement.

Abstract: Cutting filament metering apparatus for a flexible filament vegetation cutting device in which a flexible filament cutting element is coiled on a filament holder rotatably driven about a substantially vertical axis with a free end of the driven filament defining a cutting plane. The cutting filament metering apparatus includes a driver element rotatably driven about a substantially vertical axis and an engagement member carried by the filament holder for driving engagement with the driver element. An escapement device is also secured to the filament holder and allows limited rotational movement of the holder with respect to the driver element to release a predetermined length of cutting filament. The filament holder is axially biased into a first position in which the driver element engages the engagement device. In one embodiment, the engagement and escapement devices are annular each having teeth circumferentially disposed and projecting radially inward toward the driver axis of rotation.

Abstract: A cutting head (20) for a filament trimmer utilizing a fixed length of filament is shaped like an inverted bowl with a flange (2). A filament retainer cup (60) is attached to the concavity of head (20) and has two V-shaped slits (64) diametrically opposed. Apertures (6) in the sides of head (20) are aligned with slits (64). Bosses (36) extend outwardly from sides of bowl about half the width of flange (2) and terminate in planar faces (6). Faces (6) are inclined inwardly and upwardly and contain slots (26). Eyelets (24) are press fit into slots (26). Filament (4) is installed through eyelets and is pressed into slits (64) so free ends (5) are the same length on both sides of the head. Free ends (5) define a cutting plane when head (20) is rotating. Slits (64) impose a slight crimp in filament (4) and prevent filament (4) from moving axially when the device is in operation.

Abstract: This invention relates to a trimming cord for a cutter which cuts weeds or the like. In accordance with the invention, rotary discs provided on the output shaft of gearing are shaped like a reel and elongated wire-like trimming cords are wound onto it in the direction opposite to the direction of rotation of the reel-shaped rotary discs. A plurality of guide support rods are positioned equidistantly around an outer circumferential opening of the reel-shaped rotary discs so that the wire-like trimming cords wound onto the reel-shaped rotary disc are thrown outward from the outer circumferential opening of the rotary discs and are rotated by the centrifugal force of the rotation of the rotary discs. During repeated cutting of weeds and the like, the wire-like trimming cords gradually wear out and their ends become shorter so that each trimming cord gradually approaches the guide support rod supporting its base portion.

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 inertia shifter which is housed in the casing for vertical and angular movements relative to the casing.

Abstract: A set of two cutting units are located on the end of a tool to be rotated. The cutting units are radially aligned and on a bevel. Each blade on each cutting unit has a radial rake of at least 60 degrees, a clearance angle, and serrations cut at an angle normal to the cutting edge to provide a series of points extending along that cutting edge.

Abstract: A rotary lawn mower blade made of a plurality of relatively small cutter segments of greater hardness arranged in series end to end along the leading edges of both ends of an elongated metal cutter bar of lesser hardness. The cutter segments are fusibly bonded to the cutter bar and the adjoining ends of the cutter segments of each series are bonded together.

Abstract: A mowing rotary sawtoothed cutter adapted to be attached to a mower for mowing or cutting grass, shrubs or trees, which comprises a thin disk having a central hole, and a suitable number of triangular small cutting blades disposed around the outer periphery of the disk and having cutting edges extending from the apex of the triangle along the both lateral edges thereof, half of the small cutting blades facing in one direction and the residual half of the small cutting blades facing in the other direction. In a preferred embodiment, the cutter includes a plurality of large cutting blades in the form of a rectangle or the like having cutting edges on the opposite lateral edges thereof, and a series of the small cutting blades facing one direction and a series of the small cutting blades facing the other direction are disposed in opposed relation to each other between the large cutting blades.

Abstract: An electric powered can opener has a housing, a feed gear that is motor connected and rotatably mounted to drive and rotate a can by holding it by its rim. An operating lever is pivoted above the gear on the housing and carries a cutter mechanism to remove the can lid. To this conventional arrangement an improvement is added in the cutter mechanism of a non-round cutter wheel connected to and movable by the lever and having a lobed or flat portion within the periphery and oriented so that the cutter wheel is substantially stationary as it is pulled into the can lid such that the meeting edge of the periphery at the flat and round periphery provides a power pierce whereupon the cutter wheel then rotates for a clean severing of the can lid. The cutter is preferably a dish-shaped cutter with a hollow ground flat or lobe portion. The lever is preferably spring biased for rotation toward the can at all times and has a slidable switch actuator that is linkage-connected to the lever for manual operation.

Abstract: A side trimmer knife having a cylindrical body with a pair of exposed faces and a cutting edge at the periphery of at least one face, with the body being defined by a pair of juxtaposed cylindrical disks of hardened steel. The disks are held in rigidly aligned relation by a plurality of cap screws extended through aligned openings in each of the disks, with the openings tapering outwardly toward an exposed face of the knife body. The head and nut for each cap screw are also tapered to fit in the tapered openings to forcibly draw the disks toward each other and maintain their lock with the disks after repeated grinding of the faces of the body for the purpose of renewing the peripheral cutting edge.

Abstract: A foldable throwing knife having a plurality of blades pivotally connected together for movement between a folded stored position in which the blades are in overlaying stacked relationship, and an unfolded throwing position wherein the blades are coplanar and at a predetermined angular displacement relative to each other. The blades include nesting notches for holding the blades in the unfolded throwing position. The knife blades are resiliently biased toward each other for forcing the notches into nesting relationship when the blades are in the unfolded throwing position.

Abstract: The invention comprises an attachment for a portable hand-tool for the dressing of lumber to obtain roughened or saw-sized surfaces. The attachment comprises a circular disk having a hub to attach it to a portable rotary drive such as a rotary hand-grinder, and a rim on the side of the disk opposite the hub. The rim has a recessed groove to receive a portion of a band saw blade at a depth exposing only the gullet and teeth of the blade. The groove is spaced approximately 1/4 inch from the outer edge of the rim. The tool is used by making multiple passes across the surface to be roughened or saw-sized, permitting on-site saw-sizing of lumber.

Abstract: An improved cutting head for a string trimmer, wherein a spool holding a length of flexible line is located on and driven by a motor drive shaft, and a housing over the spool is located on the drive shaft and driven by the shaft through the spool, this arrangement reducing the vibration experienced as the string trimmer is operated. The housing is attached to the drive shaft independently of the spool, allowing the spool to be quickly and easily changed, without the need for special tools, by unlocking and removing a hub portion of the housing, slipping the old spool from the drive shaft, slipping on a new spool, and reinstalling the hub.

Abstract: An improved vegetation cutting device (2) comprises a rotatable cutting head (4) having a radially outwardly extending cutting line (14). Cutting line (14) extends through an exit aperture (12) in the cutting head (4) to define a free end portion (16) that serves as the vegetation cutting element. A line retaining member (20) is defined by a crimped tube (22) which distorts the cutting line (14) out of its straight line path as the cutting line (14) extends from the interior of the cutting head (4) to the exit aperture (12). This distortion causes the line (14) to rub against the tube (22) to exert a frictional retaining force sufficiently large to prevent the line (14) from sucking back into the cutting head (4) should it break off at the exit aperture (12).

Abstract: In an annular saw, that is to say a circular saw with an annular saw blade, the saw blade is adapted to rotate about an imaginary center axis by being driven via a drive shaft which is parallel to the center axis and has a fulcrum between the annular saw blade and its center. Mounted on the drive shaft (27) are two drive rollers (25, 26), of which the adjacent surfaces (41, 42) are bevelled at a certain bevel angle so that the rollers comprise drive surfaces which, between them, form a wedge-shaped groove (40). The two lateral surfaces of the saw blade (8) are bevelled in a corresponding manner within a region (13) close to the inner edge (15) of the saw blade, the bevel angle being the same as for the drive rollers, the bevelled edge portion of the annular saw blade being clamped between the bevelled drive surfaces of the drive rollers in the wedge-shaped groove.

Abstract: A cutter wheel for a brush chipper or the like has a support plate generally centered on, extending perpendicular to, and rotatable in a predetermined rotational sense about a central support axis. This plate is formed with a plurality of slots angularly equispaced about and radially equispaced from the support axis and with a plurality of screw holes each trailing a respective slot relative to the rotational sense. A plurality of blades each have an annular outer periphery formed as a succession of cutting edges. The outer peripheries of the blades are centered on respective blade axes and each blade has at the respective blade axis a throughgoing attachment hole. Respective attachment screws engage through the attachment holes with the screw holes, with one of the cutting edges directed forwardly in the rotational sense of the support plate. Thus with this system a new cutting edge can be brought up simply by loosening the respective screw and rotating the blade, then tightening the screw.

Abstract: The subject invention is a lawn mower blade hub member adapted for interconnecting a plurality of flexible blades, all affixed and disposed in a radial fashion from the centrally disposed hub member, which hub member is then mounted for concentric rotation on the lawn mower engine drive shaft; and wherein each such blade mounted to the hub member is comprised of a flexible, non-rigid, material. The hub member is a circular, plate-like member which has a plurality of insert openings which are adapted to receive and securely hold the radially inner ends of the respective flexible blade members. Disposed laterally adjacent to and just radially outwardly of the respective insert openings are vertically extending bosses, which bosses are disposed between the respective insert openings, thereby forming between adjacent bosses a channel area to securely hold a portion of the radially inner end of the flexible blade member in a radially outwardly rigid position.

Abstract: A saw blade is adapted for attachment to a power operated surgical saw having a blade element with teeth disposed along at least a portion of the periphery of same to define a cutting surface and having a saw connector receiving opening therein. A guard element is secured to the blade portion on at least one side thereof and extends outwardly therefrom in a direction transverse to the major axis of the blade. The guard portions are set at a predetermined distance from the cutting surface so as to define a depth of cut of the saw blade, whereby a surgeon may utilize the blade, either rotary type, or oscillatory type for sternal splitting incisions without the danger of too deep a cut to a point where injury to the heart and great vessels can occur. Likewise, blades according to the present invention can be utilized with greater safety for the patient in removal of casts and for orthopedic surgical purposes.

Abstract: A convenience improvement for rotary mowers, trimmers and edgers of vegetation that have a rotating body from which one or more flexible cord-like filamentous cutting blades or flails extend radially so that additional flail length can be fed from the device by merely bumping the rotating body on the ground. A pair of disc-shaped cams, preferably having square peripheries, are radially mounted on the centerline of the cutter, oriented at 45.degree. to each other. They interact with a cam follower so that when a first cam is moved axially out of contact with the follower, by bumping of the rotating body on the ground, the other moves axially into engagement with the follower after a 45.degree. rotation. Once the bump is over, the second cam moves axially in the reverse direction, disengaging the cam follower and allowing another 45.degree. of rotation before the first cam, repositioned by the axial movement comes into abutment contact with the cam follower. The 90.degree.

Abstract: A disposable cutting edge to be installed upon a lawn mower rotor and an audible tone generator to warn the operator when the disposable cutting edge is not properly installed. A disposable cutting edge providing a quick and safe snap-on/snap-off installation/removal upon a specially constructed rotor containing an edge positioning sensor, and capable of generating an audible alarm.

Abstract: A line metering apparatus (20) for use on a vegetation cutting device (22) includes a driving portion (40) and a driven portion (42). A pivotable pawl (58) selectively couples the driving and driven portions (40) and (42). Whenever the motor (28) is de-energized by turning it off, the driven portion (42) overruns the driving portion (40) causing the pawl (58) to disengage and allow filament line indexing to occur.

Abstract: A cutting head, especially grass cutting head for a free-cutting device having a main body which essentially comprises two discs spaced axially from each other and rigidly connected with each other; between and approximately parallel to the discs are arranged at least two pivotally mounted, blade-like cutting tools which, during rotation of the cutting head, project beyond the peripheral edge of the discs and, because of the arising centrifugal force, align themselves radially outwardly. A pivot pin is rigidly connected with the cutting tool; the pivot pin extends upwardly and downwardly beyond the cutting plane, and is held approximately parallel to the axis of rotation and is partially surrounded by bearing seats of the discs; these bearing seats are located axially across from each other and are open approximately toward the axis of rotation of the cutting head.

Abstract: A serrated blade to be mounted on a mowing machine has a plurality of fingers arranged at regular intervals along the circumference of an imaginary circle and a plurality of sawteeth are provided between adjacent fingers. The sharp-pointed ends of the sawteeth define points of a substantially circular arc which has a smaller radius of curvature than the imaginary circle and is eccentric thereto so that each of the fingers is radially recessed on one side thereof.

Abstract: A machine for cutting grass and the like having a flexible strip-like cutting member supported by a disc within a housing. The strip-like member is mounted vertically and the housing has a slope such that the strip-like member is rotated to have a horizontal leading cutting edge extending beyond the housing and an inclined trailing edge which creates a vortex effect within the housing when the strip is driven by a motor to cause grass to assume a more vertical position for cutting thereof. If the cutting edge of the strip strikes an obstacle, it will be deflected into a recess in the housing rather than propelling the obstacle which might have resulted if the blade were rigid. A bottom cover plate is removably secured to the housing to permit the disc carrying the cutting member to store the same therein. Indexing of the cutting member permits measured amounts thereof to be fed from storage.

Abstract: A rotary cutting or shearing wheel of one-piece configuration formed from sheet stock including an extruded hub section and a dome wheel section including a cold formed, feathered, cutting edge at the outer periphery.

Abstract: A filament-type vegetation trimmer has an electric motor, a head rotatable by the motor, and a supply of a filament in the head, with the filament extending from the head, whereby on rotation of the head by the motor the extending filament section can cut vegetation. The trimmer further comprises a circuit for detecting the current consumption of the motor and for generating an actual-value output corresponding thereto, an actual-value generator for generating a set-point output corresponding to the current consumption of the motor when the filament is extending from the head by less than a predetermined distance, and a comparator for comparing these outputs and generating a signal when the actual-value output is less than the set-point output.

Abstract: A rotary blade for a pruning machine which comprises a flexible disc made from a high molecular weight elastomeric material, said disc having a plurality of blades projecting radially from the periphery of said disc and a mounting hole disposed in the center of said disc.

Abstract: A cutting blade for brush and weed cutting machines and the like includes a unitary body with radially extending cutting arms molded from a durable high strength plastic material consisting of approximately 5% glass fiber embodied in nylon.

Abstract: A balanced mower head for carrying a plurality of monofilament lines. The mower head is suitable for being mounted on the shaft of conventional rotary mower and includes certain features which particularly adapt the head for universal fit and for replacing the conventional mower blade with monofilament cutting lines thereby substantially enhancing the safety of the cutting operation. The head defines a bore extending therethrough which is proportioned for receiving the shaft which normally carries the blade of a conventional rotary mower. A plurality of line holders extend outwardly from the head body and define at their outboard end portions an opening which is proportioned for receiving a line such that the line extends outwardly from the outboard end portion of each of the line holders to perform the cutting operation upon rapid rotation of the head. Means are provided for generating air currents in a vertical direction during the cutting operation to stand the vegetation up prior to its being cut.

Abstract: A scarifying tool is disclosed suitable for use in conjunction with disc floor maintenance machines. The scarifying tool includes a support plate with a plurality of resilient or flexible members attached thereto. The flexible member may be lightweight spring-steel strap material one end of which is secured to a disc plate. A cutter is then mounted on the strap at a point spaced from the disc support.

Abstract: A narrow profile power handle uniquely adapted for use as a flexible line trimmer having improved handling and safety features is disclosed. The power handle is also equipped with a quick connect and disconnect coupling and is useful for driving attachments to produce hand held rotary implements and tools such as brush cutters, edgers, cultivators, drills, etc., hand held reciprocating implements and tools such as hedge clippers, saws, etc., as well as portable water pumps, air compressors, generators, etc.The crankshaft of a two-stroke internal combustion engine is disposed along the longitudinal axis of a narrow profile housing which includes a rear handle having a hand grip portion disposed above and projecting rearwardly parallel to the axis of the housing. The cylinder extends upwardly from the crankcase, the carburetor is disposed below the crankcase, the flywheel, ignition system and starter to the rear, and the gas tank is disposed below the rear handle.

Abstract: A rotary cutter head mounted on the end of a handle to power rotate at high speed one or more centrifugally whirled free ends of a reserve of nylon line wound on a spool co-axially pivotally mounted within the head.A co-axially spring biased indexer is subject to inertia applied through the handle while the device is running to effect the feedfing of precise increments of line from the spool to the free line ends. The indexer is automatically self-inhibiting when the line ends reach a predetermined optimum length of approximately eight inches and continues to be self-inhibiting until the line ends wear down, in use, to less than a predetermined minimum length of approximately five inches.

Abstract: Clamp capable of mechanical clamping and optionally useful for providing especially high electrical conductivity having a pair of juxtaposed clamping jaws for gripping an object. One important use of the clamp is to grip an article through which high current is required to flow as, for example, in electric welding. At least one of the jaw blocks is of deep case-hardened cold rolled steel, and when used for high electrical conductivity, is copper coated. The face of this block is provided with concentric teeth which bite into the article. The outer faces of the teeth are perpendicular to the surface of the article being gripped. This inhibits skidding of the clamp and also provides good electrical contact where needed, even in the presence of rust or corrosion. The circular shape of teeth permits rotation or oscillation of the clamp during the clamping operation, which facilitates cleaning of the engaged surfaces and enhances electrical conductivity.

Abstract: A housing and cutting line assembly for a vegetation cutting apparatus of the type which cuts with rapidly moving lines extending from a rotating housing includes metallic line guides taking a configuration which addresses the effective guiding of the extending of the lines exteriorly of the housing and the dissipation of heat from the lines. The line guides each have a trailing side wall bearing surface for the associated line, which includes two linear surface portions angularly disposed with respect to one another, and a leading side wall bearing surface which includes a linear surface portion and a curvilinear surface portion. The linear leading side wall surface portion is substantially uniformly spaced from an inner, linear trailing side wall bearing surface portion, and the curvilinear surface portion of the leading side wall bearing surface curves away from this inner surface portion.

Abstract: A lawn mower comprising a plurality of flexible filament cutter elements carried on a continuous or endless driven belt. The lawn mower includes a plate-like frame having an arcuate front end formed as a portion of a perfect circle, on the underside of which is mounted a plurality of driven pulleys. A drive motor having a drive pulley is mounted on the frame, in a position to the rear of the driven pulleys. A drive belt is operatively mounted around the driven pulleys and around the drive pulley on the motor for driving the driven pulleys. The endless belt which carries the flexible filament cutter elements is mounted around the driven pulleys, whereby when the driven pulleys are rotated by the drive belt, the belt carrying the flexible cutter filaments is moved around the arcuate front end of the mower frame, and the filament cutter elements are moved outwardly by centrifugal force, for cutting engagement with grass and other vegetation, with a flail type cutting action.

Abstract: A cutting blade for agricultural equipment defined by a truncated diamond configuration in plan view, where the cutting blade is made from a high strength plastic material, and where the leading or cutting edges thereof are beveled in a downward and outward direction. In an alternative embodiment, the cutting blade is in a "double diamond" shape, i.e. similar to two truncated diamond shapes at a right angle to each other. In any event, with either invention form, the cutting blade is reversible for extended use.The invention affords particular adaptability to what is presently and commercially known as home trimming and/or edging equipment; however, more far-reaching end purposes are achieved as, for example, the effective cutting of heavy grass, brush and scrub trees because of the unique shape and the material of each cutting blade per se.

Abstract: An automatic development reel type cutter head for a filament trimmer comprises a circular base member having a circular array of post-like upstanding members and a filament coil disposed about selected of the post-like upstanding members and inside of the remaining post like members. The filament coil has a free end portion which is automatically deployed outwardly from the coil as the cutter head is rotated by a drive shaft upon which the cutter head is mounted against one of the post-like members so as to project radially outwardly therefrom. As one free end portion wears and breaks off as a result of frictional contact with the post-like member from which it projects, another free end portion is automatically deployed outwardly from another post-like member. In one embodiment of the invention a filament retainer plate is disposed over only those post-like members about which the filament is to be wound.

Abstract: A safety cutter blade for a rotary trimmer. The blade has a circular hub formed with a central opening for mounting the blade on the drive shaft of a rotary trimmer. An annulus is made integral with and coplanar with the hub. A plurality of cutting teeth are formed integrally with the annulus at its periphery. Each tooth is provided with a swept convex cutting edge and a straight cutting edge on opposite sides thereof. The convex cutting edges constitute a set of negative cutting edges which force severed foliage away from the center of the blade while the straight cutting edges constitute a second set of cutting edges which are adapted to cutting short grass. Each of these sets of cutting edges is adapted to be effective when they are the leading edges of the teeth of the cutter blade which is determined by the direction of rotation of the trimmer drive shaft and the position of the blade relative thereto.

Abstract: A safety cutter blade for a rotary trimmer. The blade has a hub formed with a central opening for mounting it on the drive shaft of a rotary trimmer. Three equally angularly spaced cutting blades are formed integrally with the hub and extend outwardly from said hub. Each blade is formed with a convex rearwardly swept cutting edge which is tangential to the hub on one side of the cutting blade and a short straight forwardly swept cutting edge on the other side of each cutting blade. Either of these cutting edges is adapted to be the leading, or effective edge depending on the orientation of the blade on the drive shaft and the direction of rotation of the trimmer shaft. The safety blade is made of an elastomer reinforced with plastic fibers. A layer of coarse fabric made of threads of an organic polymer is embedded in the elastomer and intersects the cutting edges of the cutting blades.

Abstract: A flail for a rotary vegetation cutter. The flail is attached to a rotor and is centrifugally swung around the axis of rotation of the rotor to strike vegetation such as grass and weeds to cut them down. The flail comprises a plurality of metal filaments braided into an elongated strand and an abradable jacket surrounding and embracing the strand. When rotated the flail strikes and cuts objects in its path, the jacekt near its free end abrading away to expose the filaments adjacent to the free end. The strand unravels where the jacket has been removed to form a group of loose metallic filament ends.

Abstract: Novel cutting heads are described for apparatus used to cut vegetation and the like. The cutting heads are each adapted to be removably affixed to a rotatable shaft and rotated about an axis generally perpendicular with a cutting plane. At least one non-metallic flexible cutting line is affixed to the novel cutting head, and ramp members are affixed to the head member which are adapted to protect the cutting line retaining means from hitting obstructions in the cutting plane.

Abstract: A filament-bearing plate or disk system for cutting grass and the like in which the filament is wound upon later-closed serrations in the disk periphery rather than passed through a succession of holes in the disk periphery; embodiments of the invention have respectively resilient, malleably deformable, and rotationally positionable aperture closing, and a ring closure.

Abstract: A rotary cutter head mounted on the end of a handle to power rotate at high speed one or more centrifugally whirled free ends of a reserve of nylon line wound on a spool co-axially pivotally mounted within the head.A co-axially spring biased indexer is subject to inertia applied through the handle while the device is running to effect the feeding of precise increments of line from the spool to the free line ends. The indexer is automatically self-inhibiting when the line ends reach a predetermined optimum length of approximately eight inches and continues to be self-inhibiting until the line ends wear down, in use, to less than a predetermined minimum length of approximately five inches.

Abstract: Rotary Vegetation Cutter is comprised of a housing, which is arranged for rotation about a central axis, having a plurality of cylindrical reel receiving cavities located in it with a line supply aperture passing between each cavity and the periphery of the housing. A supply reel is rotatably located in each cavity and a flexible non-metallic line has an inner portion which is wound around the reel and an outer portion which passes through the associated aperture and extends outwardly of the periphery of the housing. Wedge-shaped teeth located on one face of the reel are urged into engagement with like configured notches located in the cavity by a spring element, which is integral with the other face of the reel, to prevent rotation of the reel due to the centrifugal force on the line when the housing is rotated.

Abstract: A lawn edging tool to be mounted to a conventional rotating shaft on a lawn edging machine which is composed of a disc-shaped member having radially extending passageways and an inner opening spaced between the center of the disc and the periphery of the disc and in communication with the passageways and sized to nest an enlarged end of a strip of rubbery material, such as a strip cut from a tire carcass and wherein the strip extends radially outwardly through the passageway to serve as flailing members.

Abstract: The cutter ring finds especial utility in the trimming of printed circuit boards, the cutter ring being provided with a beveled cutting edge having a number of nonuniformly or unevenly spaced notches formed therein.