Abstract: A mulching deck particularly designed to handle tall, thick grasses and weeds (dry or wet), and a kit for converting an existing mowing deck into such a mulching deck. The deck features the combination of a closed discharge chute in a multi-bladed rotary mower having a plurality of stationary cutting blades positioned within the rotary blade housing. Deflectors may be provided in the housing for helping to redirect the clippings back into the path of the rotary and stationary blades for further comminution.

Abstract: A lawn mower blade includes support flanges projecting orthogonally relative to the first and second ends of the lawn mower blade arranged to mount blade inserts below each support flange, wherein each blade insert is arranged to project beyond a side wall spaced from the support flange.

Abstract: A mulching blade for rotary lawn mowers having a centrally-disposed mounting point and two cutting arms extending outwardly therefrom, each cutting arm having a leading edge and a trailing edge, the leading edge being sharpened to form a cutting edge for severing grass, at least one of the arms being angled downwardly from said trailing edge to said leading edge to induce grass clipping upwardly for subsequent engagement with the cutting edge of the second cutting arm in order to finely mulch the grass clippings. Each cutting arm is generally horizontally planar proximate to the cutting edge to allow for ease in resharpening.

Abstract: A rotary lawn mower blade has a plurality of shredders with cutting edges affixed to the blade. The shredders provide additional cutting edges for fine shredding of vegetation. These shredders may be bolted, welded or cut out of the blade. A ridge is provided for aiding the grass clippings to drop to the ground.

Abstract: An improved blade member is shown for the type of rotary lawn mower that includes a shroud supported on wheels for horizontally traversing the surface of a lawn, a rotatably driven shaft extending downwardly at the horizontal center of the shroud for rotatably driving a blade assembly, and an opening in the upper part of the shroud for the exit of cuttings from the lawn. The blade member has a central section of circular configuration whose periphery is concentric to a center balance point, means for securing the driving shaft to the member at the center balance point, and three blade arms which are symmetrically circumferentially spaced about the central section and extend radially outwardly therefrom. Each blade arm has its forward side sharpened to form a cutting edge and has a portion of its width adjacent its rearward side inclined upwardly to create an air lift for lifting cuttings toward the exit port.

Abstract: A mulching and shredding attachment for use on lawn mowers or lawn vacuums held in place by a bracket which uses a lever (44) and a clevis pin (54) so that the mulcher can easily be removed or lifted up while remaining attached to said lawn equipment. The mulcher is made of rigid material and shaped into a chute (10) and uses a bottom plate (24) and an adjustable deflector (20) which allows lawn debris to be directed into the lawn. Inside the mulcher chute (10) is a cutter grid with sharpened blades (16) positioned parallel with the natural travel of exiting lawn debris as it passes through the mulcher chute (10). The cutter grid is fastened by a rod (34) which permits up and down movement of said cutter grid. This movement is limited by means of a lever (32) attached to the upper end of the cutter grid as it comes in contact with the upper inside surface of the mulcher chute (10). The horizonal position of the sharpened blades (30) allows a variety of materials, including leaves, pine needles, twigs, ect.

Abstract: A mower blade suitable for bagging, side discharge and mulching is provided. A laterally upswept outboard cutting portion cuts the grass and sucks the clippings upwardly. The clippings are forced by the combined effects of the upswept outboard cutting portion and an upswept inboard cutting portion into an intermediate cutting portion where they are further comminuted and are then sucked back into both the outboard cutting portion and the inboard cutting portion. These double circulation paths result in excellent comminution and superior hiding of the clippings.

Abstract: A manual powered lawn mower comprises a pair of large diameter drive wheels on an axle, two clutch and roller bearing mechanisms on the axle coupling the drive wheels thereto, a gear mechanism coupled to the axle for translating rotation of the drive wheels to rotation of a gear around a vertical axis, and a rotary type blade which is coupled to the gear mechanism via a vertical axle and another clutch and roller bearing mechanism. When the lawn mower is pushed forward, the clutch and roller bearing mechanisms on the wheel axle causes the axle to drive the gear mechanism, which in turn drives the vertical axle and the blade. When a drive wheel is not turning the axle faster than the speed that the axle is turning, that drive wheel is decoupled by the clutch and roller bearing mechanism and no longer adds either power or drag to the system. With clutch and roller bearing mechanisms on each wheel, a "differential" is provided which permits maneuverability without adversely affecting blade speed.

Abstract: A lawnmower blade includes a center blade section having an opening for mounting and fastening the blade to the lower end of a mower drive shaft and a pair of opposite outer blade sections containing cutting edges. The outer blade sections are substantially equal in length to one another. Also, the blade includes a pair of assemblies defining yieldable articulating joints attaching one end portion of each outer blade section to one of the opposite end portions of the center blade section such that each outer blade section can both pivot upwardly and rotate backwardly relative to the forward direction of blade rotation and to the respective one opposite end portion of the center blade section so as to yield upon striking an object and thereby prevent damage to the engine crankshaft or the cutting edges.

Abstract: A rotary mulching mower has a rotating impeller or rake mounted anteriorly of a shredder rotor assembly. The latter comprises a motor driven rotatable member or rotor supporting circumferentially spaced rows of radially extending shredding pins extending below and above the disk. The upwardly extending pins mesh with complimentary stator pins mounted on the mower housing above the shredding rotor. Leaves or other lawn debris are passed by the impeller into a manifold and then directed via a suitable baffle to the meshing pins to be shredded thereby into mulch whereas the downwardly directed pins function effectively to remove thatch from the lawn being mulch mowed.

Abstract: A lawn mower has a cutter device which includes lower and upper cutter blades coupled to a rotatable shaft drivable by an engine and substantially horizontally rotatable in a direction. The lower cutter blade has a distal end region including a cutting edge facing in the direction of rotation. The upper cutter blade extends substantially parallel to the lower cutter blade, and has a distal end region including a cutting edge facing in the direction of rotation and positioned forwardly of the cutting edge of the lower cutter blade. The width of the distal end region of the lower cutter blade is larger than the width of the distal end region of the upper cutter blade. The distal end regions of the lower and upper cutter blades extend substantially parallel to each other and are vertically spaced from each other, with an air passage defined therebetween.

Abstract: A cutter and housing assembly for a lawn mower has a cutter having a plurality of blades disposed dispersely as viewed in plan, and a cutter housing accommodating the cutter therein and having at least an upper panel and a side grass clipping discharge outlet. The upper panel has an elevated panel portion which defines a grass clipping discharge passage. The elevated panel portion is spaced from lower ends of the blades by a distance ranging from 120 mm to 140 mm, and is higher than the upper panel by a distance ranging from 0 mm to 20 mm.

Abstract: A lawnmower blade which is characterized by an elongated, flat blade bar having a slight twist and fitted with a blower element at each end, along with pivotally or rotatably-mounted cutter discs. Each blower element includes a base plate secured to the blade bar and terminating in an extending blower top plate having top plate serrations on the end thereof. In a first preferred embodiment a perforated cutter disc is secured to each end of the blade bar beneath the blower element by means of a shoulder bolt which extends through one of six perforations to facilitate pivotally and eccentrically mounting the perforated cutter discs to the blade bar. In a second preferred embodiment a two-piece cutter disc is rotatably mounted on each end of the blade bar through an enlarged center opening.

Abstract: A mulching mower has at least one generally enclosed cutting chamber in which a rotatable cutting blade is carried for rotation in a generally horizontal cutting plane. The side wall which defines the circumferential boundary of the cutting chamber is not perfectly circular with respect to the axis of blade rotation. Instead, the chamber is stretched or elongated with respect to the blade tips over the rear half of the chamber to be obround to the rear of the chamber. This enhances use of the mower as a mulcher. In addition, grass deflecting members are desirably used in the rear half of the chamber to further enhance the mulching action provided by the chamber.

Abstract: A lawn mower has a cutter blade rotatable in a substantially horizontal plane, and a cutter housing with the cutter blade being rotatably accommodated therein, the cutter housing comprising an upper wall having a raised scroll, and a circumferential wall having a discharge duct contiguous to the scroll and defining a discharge port. A first inner member is detachably disposed along inner surfaces of the upper and circumferential walls of the cutter housing, the first inner member having an inner surface of arcuate cross section. A second inner member is detachably disposed in the discharge duct contiguously to the first inner member in closing relationship to the discharge port, the second inner member being separate from the first inner member and having an inner surface of arcuate cross section.

Abstract: A cutting and mulching blade assembly for a rotary type lawn mower or similar device that can be installed as an original part or as an after market application by an owner or other operator. Consisting of a two bladed design, it will cut grass, leaves and other similar materials (medium) then re-cut it several times to reduce these medium to a size much less than a conventional mower (considered mulch). It can be used as strictly a mulcher dispensing cuttings below the deck onto the ground or may be used to disperse the cuttings out of a chute onto the ground away from the device or into a bag. This can all be done without changing the blade in any way.

Abstract: A locking bolt apparatus includes a bolt having a fastening end with a circumferential channel around the fastening end, a bolt lock assembly including a cylindrical sleeve for receiving the fastening end of the bolt, the cylindrical sleeve having a pin slot angled with respect to the cylindrical sleeve longitudinal axis, a locking pin in the slot oriented perpendicular to the longitudinal axis of the cylindrical sleeve and having two ends extending beyond the slot, the pin positioned to laterally enter the circumferential channel, and an annular release member, slidably encircling the cylindrical sleeve, for engaging the two ends of the pin and pushing the pin out of the slot and out of the channel to release the bolt.

Abstract: A hinged safety shield for a crop cutting apparatus having a frame for attachment to a tractor. A transversely extended cutter bar is supported on the frame for pivotal movement between a lower, operating position and a raised, transport position. The safety shield is pivotally mounted at one end portion thereof to the frame. A hydraulic cylinder for pivotally moving the cutter bar also acts to raise the shield from a lower, shielding position to an upper position. The safety shield is held in the upper position while the cutter bar is lowered whereupon unrestricted access is gained to the cutter bar for repair and maintenance procedures.

Abstract: A grass or vegetation cutting blade is provided, which includes multiple cutting edges, including a leading cutting edge positioned below a trailing cutting edge. An upturned foil is provided behind the leading edge, such that grass initially cut by the leading edge is directed upwardly by the foil toward the trailing edge, to be cut in midair. An inturned spur is provided, which provides inward air and clipping flow toward the rotational axis of the blade. The blade is contemplated for use in conventional side- or rear-discharging housings, as well as mulching or recycling housings. The blade is resistant to clogging, and includes power efficient properties.

Abstract: A mulching blade for a mower is described herein. In one embodiment shredding teeth are arranged about a bulging central portion of the blade (or a separate disk mounted with the blade). During mowing these teeth shred grass and leaves trapped within the mower housing, thereby using the housing and air flow generated by the blade to bring the debris into mulching contact with the teeth rotating at high speed within the housing.

Abstract: A grass line mowing apparatus for cutting boundary lines in the grass of a playing field is provided with a carriage apparatus having a housing with a deck spaced above the ground, a vertical rotary shaft mounted for rotation relative to the housing deck and extending below the deck, and power drive source mounted on the housing deck and drivingly coupled to the rotary shaft to cause rotation thereof. The grass line mowing apparatus includes a line cutting blade assembly fastened to a mounting flange on a lower end of the rotary shaft and capable of cutting a swath of grass of narrow width to define the desired boundary line.

Abstract: A motor-powered mulching mower and edger apparatus (20) with dual rotary mower blades (33,35), a mower deck (21) and a side-mounted edger attachment (75) adapted by a clutch mechanism (110,111) for simultaneous operation therewith. An adjustable mulching control valve (60) mounted at the inlet of a discharge chute (39) from the deck (21) allows variation of the proportions of mulching to clippings bagging in the range of zero to one hundred percent during mower operation. The dual rotary blades (33,35) are mounted in vertically spaced relation and select leading-angle trailing-angle relationship and are cooperable with an internal deck-mounted air stream deflector (68) for deflecting multiple cuttings of grass clippings in an inwardly directed spiral path such that after the initial cutting, each of the clippings is disposed to at least two more cuttings to produce a finer mulch.

Abstract: A mower with a power-transmission mechanism made up with an outer ring gear and an annular gear set inside the outer ring gear with the outer teeth meshed with inner teeth of the outer ring gear. Inner teeth of the annular gear are meshed with the teeth of a central gear installed inside the annular gear. The number of teeth of the three gears are slightly different, and the gears are arranged so that the outer ring gear and the central gear are on a same center axis with the annular gear off the center axis. By driving the annular gear, the outer ring gear and the central gear are rotated in the opposite direction. Accordingly, blade wheels mounted on these two gears are turned in the opposite direction, thus cutting the grass efficiently.

Abstract: The multi-purpose attachments for power lawn mower blades are designed to increase the efficiency and usefulness of the mower both to cut lawns and blow snow, leaves or debris from areas. The serrated cutter attachments allow replacement with ease, have longer lasting sharpness and the cutting surface is protected from foreign objects. In addition, the serrated cutters may be manufactured economically enough to allow used cutter attachments to be discarded. The blower attachments are designed to create adequate air pressure to remove snow, leaves and debris from select areas. The blower attachments are also designed to be resilient to assure safe use if foreign objects are struck during such use.

Abstract: A mower deck within which a blade coupled with a vertical shaft rotates for cutting vegetation. The deck includes a generally horizontal central portion, and side walls downwardly extending from the central portion. The central portion and side walls form a compartment within which the blade rotates to cut vegetation. A vertically extending and generally cylindrical portion is formed integral with the central portion for operatively supporting the vertical shaft for rotation during mowing operation. Two bearings are positioned within the cylindrical portion for rotatably supporting the vertical shaft. A radially inwardly extending portion is formed within the cylindrical portion and is positioned between the bearings for vertically locating the bearings within the cylinder. The inwardly extending portion is formed integral with the cylindrical portion. The radially inwardly extending portion includes a plurality of vertically extending support ribs for vertically locating the bearings within the cylinder.

Abstract: The invention relates to a blade-protecting device (13, 14) for cleaning units (1) being provided with a rotary cutter or blade (3) which is supported on a shaft (6) and which can be rotated by means of a motor (11). The shaft (6) is mounted in a body (8). The blade-protecting device (13, 14) comprises a hub part (13) having a diameter being smaller than the diameter or the largest dimension of the rotatable blade (3). This hub part (13) is arranged substantially coaxially with the shaft (6) adjacent the blade (3) and is freely rotatable relatively to the body (8). A number of fixed, substantially radially oriented arms (14) are rigidly attached to the hub part and extend past the periphery of the blade or of the circle described by the rotating blade, said arms (14) preferably being arranged in locations spaced equiangularly around the hub part.

Abstract: A landscape care tool can take the form of a vegetation-cutting tool incorporating circular-shaped blades having teeth or an earth-working tool incorporating hoeing tines. Drive linkage for such tool forms, as well as other tool forms, imparts linear movement in response to rotation of a shaft. The drive linkage includes a worm element which rotates with the shaft and a tooth carrier which moves linearly in response to rotation of the worm element. The worm element has one set of threads angled in one direction and a second set of threads angled in the opposite direction. The tooth carrier carries one tooth which engages threads of the first set of threads in order to move the carrier in one linear direction and a second tooth which engages threads of the second set of threads to move the carrier in the opposite linear direction.

Abstract: A base cutter assembly (16) of a sugarcane harvester (10) in which the accumulation of trash around the drive shaft (32) of the base cutter assembly (16) is prevented. The base cutter assembly (16) is provided with a shaped drive shaft (32) which causes the trash which in use is wrapped around the shaft, to migrate towards an intermediate portion (40) of the drive shaft (32); and a cleaning means (34) positioned adjacent the intermediate portion (40) and adapted to remove the trash which builds up at the intermediate portion (40). The cleaning means may be in the form of a rotatable wheel (42) which is angled with respect to the longitudinal axis of the drive shaft (32).

Abstract: A mulching blade for a lawn mower having a housing which is mounted on the shaft of the lawn mower motor below the deck of the housing. The housing has a skirt with a opening. The opening may be closed by mulching door having holes therein which contains the grass clippings in the housing while releasing air pressure during mulching operations. The blade has outer and inner sections which extend radially inward from the tips thereof. The outer section is pitched upwardly with respect to the ground so as to lift the clipping as they are cut by a cutting edge extending along one edge of the sections. The inner section is pitched downwardly so as to push clippings which are recut by the cutting edge along the inner section towards the ground.

Abstract: A rotor cutter comprises a cutting member (1) adapted to be driven into rotation about an axis of rotation (3). The cutting member comprises a knife holder (6) connected with a knife (12). The knife (12) comprises a blade, which during the rotation of the cutting member (1) rotates in a plane substantially perpendicular to the axis of rotation (3) of the cutting member (1). The knife (12) comprises furthermore a shank (13) rotatably journalled relative to the knife holder (6) about a swivel axis (11), said swivel axis forming an acute angle (.alpha.) with the axis of rotation (3) of the cutting member (1), the angle space of said angle facing upwards.

Abstract: The invention relates to a cutter blade for mowers of harvesting machines the cutter bevel of which comprises two zones of different inclination relative to the blade leaf plane wherein between the zone molded to the cutting edge and the zone extending to the upper blade plane a gradation is provided. It relates furtheron to a method for the production of said cutter bevels on cutting blades of mowers which comprise two zones having different blade angles relative to the blade leaf plane wherein in a first embossing process the zone of the cutter bevel extending to the upper blade plane is pressed into the blade blank in parallel to the cutting edge provided and in a subsequent embossing process, the zone extending to the cutting edge is molded on and the embosssing portion extending beyond the lower blade leaf plane is ground away.

Abstract: A brush and tree cutter blade adapted for mounting on a power-driven vehicle, the improvement being a spring loaded tooth mounted on each of three mounting plates with the mounting plates being hinged to the three sides of a triangular mounting plate. This arrangement allows the mounting plates to deflect upward or downward and the tooth to deflect inward when the tooth strikes an object such as a boulder or rock.

Abstract: A grass mowing or cutting machine suitable for towing by general application vehicles is disclosed. The machine is operated by its advance and comprises a wheeled frame having a horizontal cutting disc which rotates about a vertical axis. A drive mechanism connects the cutting disc to the wheel(s) of the wheeled frame so that when the mowing apparatus is pulled or pushed, the cutting disc will be rotated by the rotation of the wheel(s). A gearing mechanism is typically provided between the cutting disc and the wheel(s). The cutting disc is preferably of web-like construction and includes aerodynamics portions to exert a downward force on the disc as it rotates through the air. The moving apparatus is designed for relatively high speed towing.

Abstract: A rotary drive mechanism comprises an hydraulic motor, a shaft rotatable by the hydraulic motor, a cutting blade (or fan impeller) connected to the shaft, and a bearing assembly supporting the shaft. The bearing assembly comprises a bearing housing, a plain journal bearing mounted in the housing, and a plain thrust bearing integral with the journal bearing also mounted in the housing.

Abstract: A multipurpose cutting device for use with power drives is disclosed. Specific and different blade configurations are provided on opposite sides of an elongated bar or a disk type support for performing different cutting functions. By securing one side of the elongated bar or disk to the end of a shaft, one function can be performed. By securing the other opposite side of the elongated bar or disk to the shaft a different function can be performed. By securing or using the elongated bar or disk at an angle to the material being cut both blade configurations can be used simultaneously to perform yet another function. The blades on the one side and the blades on the other side of the elongated bar or disk may each have the blade configuration facing in one direction of rotation of one shape and the configuration facing in the other direction of another shape for different cutting characteristics when the direction of rotation is reversed.

Abstract: Disclosed herein is a cutting blade for a mowing apparatus, which comprises a pair of first and second pivotal cutting wheels slidably superposed with each other and each provided with a number of grass cutting edges along its circumference, each of the teeth having a major surface, two side edges and an outer periphery edge; and mechanism for reciprocatingly rotating each cutting wheel in opposite directions through a predetermined angle, respectively. At least one of the side edges of each of the teeth of the cutting wheels is defined by an inclined surface forming an acute angle relative to a major surface of the tooth so as to form a cutting edge, and the outer periphery edge is defined by a plane substantially perpendicular to the major surface of the tooth. Namely, there is no sharp edge in the outer peripheries of the teeth of the cutting wheels or the free ends of teeth.

Abstract: This invention is a mowing machine which is to be hitched to the back of an agricultural tractor. The primary purpose of the invention is to cut and clean vegetation and debris from along agricultural fence rows. The cutting assembly of the mowing machine includes flails which are rapidly rotated and are made from fabric reinforced rubber. The flails are flexible and are about two feet long, about three-fourths of an inch thick, about three inches wide, and weigh about five pounds. The invention may be used to cut and remove vegetation and debris from under fence rows since the flails are flexible and easily mow around fence posts without damaging either the posts or the flails. The cutting assembly can be positioned so that a plane in which the cutting flails rotate is either inclined or declined to match the inclined slopes of embankments and declined slopes of drainage ditches.

Abstract: A tree stump cutter than enables the removal of tree stumps, after felling of trees, to at least below ground level, includes at least one pair of circular cutting blades rotatably mounted on a support frame. The frame can be coupled to a tractor in a configuration in which the blades, driven by hydraulic motors, can cut off tree stumps below ground level by being displaced across the tree stumps by the tractor. The blades are rotatable about parallel axes and the blades of at least one pair are spaced apart by approximately the sum of their radii, thus permitting rotation in substantially the same plane.

Abstract: A leaf mulcher is an attachment to a rotary blade power lawnmower. The mulcher has a screen surrounded by a frame with a flange extending from the frame to provide attachment means to the lawnmower. The mulcher is mounted so that the screen transverses a grass outlet on the lawnmower while leaving a space between the outlet and the screen to allow some of the cuttings to escape from the outlet without passing through the screen.

Abstract: Apparatus is disclosed for continuously cleaning the housing of an operating rotary lawn mower of grass clippings which have been thrown up by the action of the cutting blade on the grass being mowed.Such apparatus comprises blades or chains radially spaced about the vertical rotatable shaft of the lawn mower, and spaced above the cutting blades and below the bottom of the housing.

Abstract: Removeable cutters are mounted at each end of a rotary lawn mower blade, which cutters can be removed and reinstalled with replacements easily and quickly without the use of tools. The replaceable cutters are each held in place by a positive locking arrangement, including a safety lock that is manually released by the user. During operation of the mower, the centrifugal force of the rotating blade further locks the cutters in place so that it is virtually impossible for them to become separated from the blade. The replaceable cutter unit also may include an air deflecting vane that aids in creating a suction action to pull the grass to an erect position and enhance the discharge of the grass clippings.

Abstract: A rotary blade for lawnmower and the like having a plurality of flexible blade members angularly spaced about a central hub portion. The blade is made of plastic, plastic composite, or composite material and is designed to cut grass and the like efficiently but to deflect around obstacles rather than cutting through them and possibly causing injury. Where impact with an obstacle is unavoidable by flexing, points of weakness are provided near the central hub portion of the blade to ensure that the blade members break off during use rather than cutting through an obstacle such as the operator's foot.

Abstract: A mowing machine provided with a frame and a plurality of mowing members provided with mowing knives. The mowing members are supported by the frame and are rotatable about upwardly extending axes of rotation. Supporting members are arranged under the mowing members are vertically adjustable relative to said mowing members, and are secured to upwardly extending carrier shafts. Above the mowing members a substantially horizontally extending driving shaft is journalled in the frame and coupled to each of the carrier shafts by means of a transmission mechanism in such a manner that the transmission mechanism a rotating movement of the driving shaft is converted into a movement of the carrier shafts parallel to the axes of rotation of the mowing means.

Abstract: Disclosed is a mowing apparatus, which includes a motive power source, first and second cutting wheels slidably superposed with each other and provided with a number of grass cutting edges, and mechanism for reciprocatively rotating each cutting wheel in opposite directions through a predetermined angle. The rotating mechanism includes a first shaft coupled to the first wheel, a cylindrical-shaped second shaft into which the first shaft is rotatably and coaxially inserted and coupled to the second wheel, and converting mechanism provided between the power source and the first and second shafts for converting the rotational motion from the power source into two oppositely and reciprocatively rotational motions of the first and second shaft within the predetermined angle.

Abstract: A mowing apparatus has a motive power source for supplying rotating motion; a pair of first and second cutting disks slidably supported with each other, each of the disks including a plurality of peripheral cutting teeth; mechanism for reciprocatively oscillating the first and second cutting disks oppositely with each other within a predetermined oscillating range; and mechanism for rotating the first and second cutting disks while the first and second cutting disks are oscillated reciprocatively by the reciprocatively oscillating mechanism.

Abstract: A brush mower head adapted to be carried by an articulating crane comprises:(1) a casing, adapted to be mounted to a crane(2) a motor carried by the casing, and(3) a drum with a center shaft mounted for rotation in the casing and powered by the motor, the axis for rotation in the drum in use being generally parallel to the ground. The drum is a cylinder having a length at least twice its diameter and has at least two hammer shafts running end to end parallel to the axis of rotation and being in balanced relationship one to another to minimize rotational imbalance of the drum. Hammers are mounted on the hammer shafts for free rotation thereabout in each of said wells. The hammers when the drum is rotating for mowing protrude by a centrifugal force beyond the surface of the cylinder and present a cutting edge to the brush being engaged.

Abstract: This invention relates to an improvement of a mowing blade unit in which a rotary blade and a fixed blade are overlapped to each other in coaxial relation to each other so as to cut the weeds under rotation of the rotary blade, wherein the circumferential edges of the rotary blade are formed with concave-shaped blade positions curved toward its rotating direction, the circumferential edges of the fixed blade are formed with a plurality of convex-shaped blade portions oppositely and slidably contacting with the concave-shaped blade portions with a specified holding angle, thereby the concave-shaped blade portions at the circumferential edges of the rotary blade take weeds into areas between each of the convex-shaped blade portions at the circumferential edges of the fixed blade and the rotary blade to hold the weeds with the convex-shaped blade portions with a specified holding angle and to make a positive cutting of the weeds to improve an efficiency of cutting operation.

Abstract: The shaft 20 of a rotary cutting element 10 driven from below includes a break zone 41 at its end 19 extending upwardly outside the bearing 24. The rotary cutting element separates entirely from the cutting bar when the shaft breaks at the break zone upon contact of the cutting element with an obstacle.

Abstract: To mow even soft grass more tidily in shearing mode without kicking pebbles, a pair of two grass cutting wheels are pivotally driven by an engine in two mutually-different directions. One cutting wheel is slidably fixed relative to the other cutting wheel for safety. The mowing machine can be used in common to shear off grass on the ground and trim a garden tree by adjusting an angle between a hollow grip pipe and the machine cutting surface.

Abstract: In a mower having a frame and a plurality of rotatable disks supported by the frame, a driving device is operable to rotate each disk, and includes a driving wheel associated with each disk, and a shaft in driven connection with a corresponding driving wheel. A coupling in driven connection with a corresponding shaft for coupling a corresponding disk to the corresponding shaft is provided, and an antifriction bearing guides the corresponding shaft. Each driving wheel and its corresponding shaft, coupling and anti-friction bearing constitutes a separately replaceable subassembly in the mower.