Abstract: An attachment is provided for selectively operating one of a variety of tools for removable attachment to the arm of a backhoe machine from which the bucket has been removed. One of the tools may have a first portion movable with respect to a second portion. Each of the tools are mounted to a rigid bar, any one of which is alternatively insertable into one end of a frame fittable on the backhoe arm. The backhoe includes a hydraulic cylinder disposed along the arm for pivoting the bucket when attached, and the attachment is provided with a sliding member connectable with the end of the cylinder for movement thereby along the attachment frame. A guide member directs the sliding member along the length of the frame. A lever is pivotally attachable at one end to a movable portion of the movable tool, and is pivotally attachable at an opposite end to the sliding member when the tool is secured in place along the frame.

Abstract: An automated plotting apparatus has a carriage assembly for positioning an axially elongated pen relative to a plotting sheet supported on a plotting surface in response to command signals received from a controller. A solenoid assembly coaxially surrounds an associated portion of the pen and moves it axially into marking engagement with the sheet. Marking fluid is supplied to the pen from a pressurized reservoir. Pinions driven by a motor mounted in stationary position relative to the plotting surface engage racks mounted on the carriage assembly to move the carriage assembly relative to the plotting surface.

Abstract: A drawing tool comprises a pair of light transmitting screens, a ground beneath each screen, and a former or tip under each screen adapted to either add material to the ground or subtract material from the ground to create a design thereon. The designs are viewed as a composite three-dimensional image and can be permanently fixed on a removable plate.

Abstract: Sheets moving in a feed direction and arranged at spaced intervals are fed through nips arranged to rollingly engage opposing sides of the sheet, each nip being formed by a roller rotating about a fixed axis and a cooperating swingably mounted roller. Resilient adjustable biasing means urges an assembly upon which the swingably mounted roller is pivotally mounted, as well as an arm forming part of the pivotally mounted roller assembly, in a first direction. A sensor is positioned adjacent the free end of said arm. Sheets moving through said nip cause displacement of said pivotal assembly against the biasing force in accordance with the thickness of the sheet passing through the nip. The biasing means comprises a thick, and accurate resilient element designed to permit the roller assembly to follow even abrupt thickness changes rapidly and accurately without experiencing overshoot or undershoot.

Abstract: A support is provided defining abutment surface portions from which one end portion of a dop stick may be supported in position paralleling and at least substantially coinciding with a predetermined axis against lateral displacement in any direction and for axial shifting relative to the support, as desired. The support defines four mounting locations spaced about the predetermined axis and disposed in a plane normal to the axis and spaced along the latter from the abutment surface portions. Elongated micrometer spindle, sleeve and thimble assemblies are supported from the mounting locations and extend along radii of the predetermined axis and the micrometer sleeve portions are supported from the corresponding mounting locations for adjustable axial shifting relative thereto. The free ends of the micrometer spindles may be spaced equally from the aforementioned axis in order to support a gem stone in centered position relative to the axis for mounting on the supported dop stick.

Abstract: An archery bow sight is set forth which may be affixed to a conventional bow for a vertical sighting irrespective of the rotation of the bow. The bow sight includes a plurality of curved pins representing different target ranges, but with each individual curved pin being a constant distance from the axis of the arrow such that the curvature of the pins allows for the bow to be tilted without affecting accuracy.

Abstract: An inclinometer of the type wherein a weight rotatable in accordance with the inclination of a vehicle is provided for a drive unit, and a torque of the drive unit is transmitted to a driven unit so as to display the inclination angle of the vehicle with an inclination indicator, there are provided a zero point adjusting spiral spring, the inner end thereof being affixed to a shaft of the driven unit, while an outer end is affixed to a rotary drive member, and a zero point adjusting knob for rotating the rotary drive member. According to this invention, after the zero point has been adjusted, the zero point display line of the indicators and the zero point scale line of the scale board can be aligned horizontally, thus improving the appearance of the zero point display.

Abstract: A navigation position plotter for determining the navigation coordinates of a point on a navigation chart and plotting the position of a point on the navigation chart. A plate bearing navigation scales divided into increments between two spaced grid lines on the navigation chart is mounted on a frame. A first plotting bar is movably mounted on the frame. A second plotting bar is pivotally mounted on the frame and intersects the first plotting bar. The frame is position over the chart such that the navigation coordinate increment underlying the second plotting bar can be read after the first and second plotting bars have been moved into intersecting relationship over the point to be plotted.

Abstract: An accessory is adapted to be attached to a foldable ruler to enhance the use of a foldable ruler in measuring the distance between two spaced-apart surfaces or elements. The accessory enhances accurate measurement and facilitates precise reading of such measurements. The accessory comprises a sheath and a bar. The sheath includes a lower channel, an upper passageway positioned above the channel, a window opening into the upper passageway, a hairline index provided adjacent to the window and spaced from one end of the sheath by a distance equal to the distance between the axis of the hinged connection of adjacent ruler sections and a free end of one of the sections which is adjacent to the axis. The bar comprises one portion without indicia and one portion having indicia or graduations thereon. A stud can be provided on the bar to engage a groove within the passageway in order to limit the slidable movement of the bar within the passageway.

Abstract: This invention relates to a system exploiting the thermal energy of the atmosphere for the drying of wood or any other product or material, the humidity content of which has to be reduced to the humidity percentage normally required for the use of the product or material.

Abstract: A housing having propeller type fans in the housing adjacent to an object or objects to be dried. Shafts, carried by sleeves projecting through the side walls or top wall, rotate the fans. Motors externally of the housing drive the shafts.In one form of the invention, the air circulated by the fans is heated by steam coils adjacent to the periphery of the blades of the fans. In another embodiment, an open flame gas or oil burner, disposed in a combustion chamber, heats air, which is subsequently directed by ducts to the fans. Exhaust blowers and exhaust ducts exhaust the fume laden air from the chamber. Still another embodiment shows pairs of juxtaposed oppositely blowing fans carried by shafts protruding through the walls of the oven and spaced heaters between the fans. Still another embodiment shows opposed fans for drying a cylindrical member passed through the chamber.

Abstract: This invention relates to a heat generating apparatus and its process utilizing air circulation and convection, wherein a chamber having air friction heat generating means is provided with outer air induction means and air flow therewithin is circulated forcibly as convective flow, thereby the temperature distribution becoming uniform throughout the interior of the chamber. Thus, it can be employed as a powerful heat source or a heating or drying chamber.

Abstract: A device for treating textiles, such as laundry, for example cleaning and drying, mainly comprising a closed housing 1 having openings 5, 6 being pneumatically closable for inserting and taking out respectively the laundry, a shaft 2 driven by 4 and rotatably journalled in said housing 1 and a drum supported by the shaft 2 and to be rotated for receiving the laundry, said drum consisting of at least two sections 7 axially displaceable through a roller or slide element 11 along a wing-like carrier 10 fastened to said shaft 2. In the carrier 10 tensioning means are provided for in order to tension said sections 7 during washing and centrifuging.

Abstract: The disclosure is of a dryer felt and dryer felt fabric for use in a paper making machine. The fabric is characterized in part by an increased paper contacting surface in the center of the belt. The fabric has an enhanced operating life as a dryer felt since the machine direction yarns are protected at the edges from direct contact with the hot dryer cans on the sheet side and in its entirety from typically abrasive carrying rolls on the back side. The improved drying efficiency in the center of the belt compensates for the prior art decreased drying efficiency at the center of the paper web being dried. This gives a uniform moisture content across the width of the drying paper web.

Abstract: A sport shoe (1, 101, 201, 400, 500, 600, 650, 700, 750, 780, 800, 850, 900, 950) is disclosed comprising a dynamic fitting system responsive to wearer movement. In various embodiments of the shoe there is provided movable strap members (17, 19), a movable instep tongue member (163, 263), a movable footbed (412, 516, 605, 705, 784), a movable tongue and heel receiving member (860, 861), adjustable cuff members (701) and interior and exterior tongue assemblies (915, 920). In use the above members in response to wearer movement tighten momentarily the fit of the sport shoe from a close fit.

Abstract: A supplemental molding, which is an extruded polymer, snaps onto the conventional molding along the front edge of a display shelf, and holds enlarged shelf labels in an inclined disposition. It is particularly suited for shelves located close to the floor level, for the labels may be read easily without stooping.

Abstract: An illuminated transparency viewing device for viewing transparent loose-leaf pages and for sorting 35 mm slides. The device has a smooth viewing surface and a ribbed sorting surface on opposite sides of the device; wherein a double-sided reflector surface is hinged between the two sides so as to pivot from a first position, wherein light is reflected through the smooth viewing surface to a second position, wherein light is reflected through the ribbed sorting surface.

Abstract: A display or indicator element has a set of movable and a set of fixed vanes of contrasting colors. Each set of vanes encompasses what is substantially a circle in the viewing direction. The sets of vanes are arranged so that the moving vanes move between a position where they are hidden (in the viewing direction) behind the stationary vanes and a position where the moving vanes occlude the stationary vanes. In such movements each moving vane passes between a pair of stationary vanes. Accordingly, contrasting effects are produced. Preferably the actuation for the movable vanes is electromagnetic.

Abstract: A flexible message sign particularly intended for highway or roadway applications, and having improved corner brackets. Each corner bracket is made of rigid members which sandwich and securely engage corners of the flexible fabric or other material from which the sign is made. Each corner bracket provides a channel for removably holding ends of frame members which maintain the flexible message panel in message displaying configuration. The frame-receiving channels maintain the frame ends out of contact with the flexible message panel, so that the panel cannot become ripped or torn by engagement with the frame ends.

Abstract: A display sign assembly for temporary vehicular traffic control and the like, having a triangular base member with three triangular side panels each articularly joined as by relatively large snap rings to a respective side of the base member and each preferably bearing a different symbol or message display, the assembly being arrangeable with the side panels on either side of the base member in essentially fixed pyramid-like configurations for selected symbol or message display or in a stacked parallel manner with respect to the base member for ease of transport and storage.

Abstract: A firearm having a frame; a barrel leading from the frame; a cartridge firing mechanism biased to an uncocked position and including a trigger and firing pin, the mechanism being operatively mounted in the frame and adapted to be operated to fire a cartridge; a rotary magazine having a plurality of circumferentially spaced cartridge chambers and being rotatable relative to the frame discretely to align the chambers with the barrel and the firing pin; a spring motor which is adapted, in use, to exert torque on the magazine relative to the frame, thereby to rotate the magazine; and indexing mechanism adapted to operate automatically after operation of the cartridge firing mechanism to allow the magazine to rotate from an aligned position in which a cartridge chamber is in alignment with the barrel and the firing pin, and to arrest the magazine in a non-aligned position in which no cartridge chamber is in alignment with the barrel and the firing pin.

Abstract: A fishing lure having a light therein which may be switched off by tension on the line when the lure is snagged. The lure is constructed of a hollow plastic body comprising a head section slidably interfitted with a tail section. A light bulb in the end of the tail section is energized by a battery and switch means which is interrupted to break the circuit when a fish hook on the tail section is snagged. Tension on the fish line connected to the head section moves the two sections apart to break the circuit. A stop limits the relative movement between the body sections.

Abstract: A fishing float is disclosed which is comprised of two longitudinally extending half portions, lengthwisely hinged together in a manner whereby they may be opened to expose the interiors thereof and closed to form a symmetrical configuration. Each half portion defines a hollow shell with a replaceable half core therein, formed of a suitable low specific gravity closed cell form material. One half portion includes a friction jaw in each end for adjustable securing engagement with a fishing line passing therethrough, and a snap lock is formed integrally with respective mating edges of the two halves to secure said two halves in a closed condition.

Abstract: A line clamp for a fishing float having a buoyant body member, the clamp consisting of a stem fixed in the body member and projecting outwardly therefrom, having at its outer end a conically enlarged head terminating in a flat circular flange having a re-entrant peripheral lip, the lip flange and head being notched radially inwardly. A plunger slidably encircles the stem and has at its outer end an enlarged head socketed to mate with said stem head, flange and lip, except for the slot thereof, and a spring biasing said plunger outwardly on the stem. The plunger is retractable manually against the spring to expose the head of the stem to permit looping of a fishing line thereabout with its reaches projecting through the notch, so that the line is clamped between the stem head and plunger when the plunger is released.

Abstract: A remote controlled model landsailer includes a wheeled vehicle having a sail supported on a mast with a fixed rig position, in which realistic heeling is produced by an outrigger structure including a transversely-mounted resilient wire having wheels at either end thereof, with the elasticity of the wire providing for realistic heeling of the vehicle while at the same time preventing the vehicle capsizing. The model landsailer is remote controlled, in one embodiment, with a single remote control radio channel which is utilized to control the position of the nose wheel of a three-wheel support structure, with the single channel radio controlled operation permitting all sailing maneuvers including heading up, jibes, tacking, coming about and runs, and with the flexible wire outrigger providing realistic visual feedback to the operator of the radio control unit.

Abstract: A liquid herbicide applicator mechanism mountable on a farming vehicle for wipingly applying the herbicide on undesired vegetation growing in a cultivated field. The applicator mechanism includes a tool bar for carrying a plurality of herbicide dispenser assemblies so that they alternately align with the rows of crop plants and the spaces therebetween as the vehicle moves through the cultivated field. Each of the herbicide dispenser assemblies receives the herbicide from a reservoir tank under the influence of gravity and has a herbicide wiper head which absorbs the herbicide for wiping application on the undesired vegetation. Each of the herbicide wiper heads is substantially rigid but deformably configurable so that it may be shaped into substantial conformity with the contour of the crop plant rows and the spaces in the cultivated field and each wiper head is provided with special absorbent wiper elements.

Abstract: This invention relates to a method for the non-agricultural production of jojoba wax through the culture of asexual embryos of jojoba.

Abstract: Solid fuels are gasified in a fixed bed with gasifying agents passed through the fixed bed from below. The gasification residues are withdrawn as solid ash or as liquid slag under the fixed bed. The reactor is charged with solid fuels through a lock chamber and with tar through a supply conduit. The tar is delivered to the fuel in numerous individual streams, which are distributed over the cross-section of the fixed bed.In the gasifying reactor, an inclined distributor surface is disposed over the fixed bed and has numerous passage openings for the tar and the solid fuels. The outlet end of the tar supply conduit is directed to the upper portion of the distributor surface. A tar tub having outlet openings is associated with the distributor surface and serves to receive the tar. The distributor surface is rotatable on a vertical axis.

Abstract: Coarse-grained solid fuels in particle sizes of at least 2 mm are gasified under a pressure of 5 to 150 bars in a fixed bed which is slowly descending and into which the gasifying agents are introduced from below whereas the incombustible mineral constituents are withdrawn as solid ash or liquid slag from the lower end of the bed. Fine-grained solid fuels are gasified in a fluidized bed under a pressure of 1 to 100 bars. Oxygen, steam and/or carbon dioxide are used as gasifying agents for the gasification in the fixed bed and in the fluidized bed. The product gas from the fluidized-bed gasifier has a temperature of 700.degree. to 1200.degree. C. and is indirectly cooled with water. The resulting steam is fed as gasifying agent to the fixed-bed gasifier. The product gas from the fixed-bed gasifier can be indirectly cooled to produce steam and at least part of said steam is fed as gasifying agent to the fluidized-bed gasifier.

Abstract: A method of grinding glass sheets whose edges are polygons that are not symmetrical about a point is carried out in an apparatus having a supply station for supporting a stack of such sheets with all of the sheets in the stack in vertical registration, a grinding station adjacent the supply station having a grinding table rotatable about an upright grinding axis and adapted to support the sheets during grinding, a template secured to the grinding table, and a pair of grinders in the grinding station radially engageable with the edges of the sheet on its grinding table and radially displaceable by the template. The method of the invention comprises the steps of transporting the sheets one at a time from the stack in the supply station to the grinding station, simultaneously engaging the grinders with the sheet in the grinding station while rotating this grinding table with its template and the sheet on the table through 180.degree.

Abstract: A formation of interior covering material is furnished for a greenhouse or covered atrium enclosure which has an original formation of exterior covering material to achieve a thermal-like insulation structure for the greenhouse-enclosure. The enclosure includes vertically aligned mullions having central portions or standards and marginal flanges extending from a sill to a head. The mullions carry panels of exterior covering material which provide a single glazing. The interior covering material is formed of flexible panels of synthetic resins which are bowed and inserted between the mullion standards and rest on the flanges. Associated members are provided to seal the space formed between the interior and exterior panels and furnish dimensional stability to the interior panels.

Abstract: There is disclosed an apparatus for mounting elements on a roof, the elements having a mounting bracket, and the roof being formed by a plurality of beam supports wherein are mounted a plurality of spaced transverse roof supports having a fixably attached roof convering thereon, the roof covering having a plurality of bores therethrough, said apparatus comprising a sleeve member positioned on said roof covering and formed by a plate member having an opening therethrough and a tubular collar member affixed to the plate member in axial alignment with the opening in the plate member thereby forming a duct. The duct is positioned in axial alignment with the bore in the roof covering.

Abstract: A prefabricated gazebo having a floor assembly formed from a plurality of lengths of a structural supporting material secured together in polygonal formation and provided with joist members and joist support members secured to the polygon formation to support a deck material. A wall assembly is formed from a plurality of wall sections, each of which may be constructed in an arch formation, one such section being secured to each of the plurality of lengths of structural supporting material. Each wall section is also secured to the two adjacent wall sections. One wall section is adapted to serve as an entrance to the gazebo. A roof assembly is formed from a plurality of identical roof sections, one such section being secured to the center of the arch of each wall section, and also secured to the two adjacent roof sections.

Abstract: In a mortarless interlocking concrete block system, general purpose intersection blocks have parallel grooves formed on their bottom surfaces; but each has mating ridges on the upper surface of its inner end only. The top surface of its corner end portion is flat, to permit an overlying course to fit thereon either at right angles or in linear alignment. The corner end portion has, in each of its two opposite side faces and in its outer end face, parallel vertical grooves matable with tongues on the system's stretcher blocks, to provide interengagement at both left and right corners and T-shaped and crossing-wall intersections. For bond beam courses, a bond beam intersection block with similarly groove corner end faces, has at its inner end portion a closed-bottom channel with saddle-like webs extending between the channel sides, to open through to its corner core and support horizontal reinforcing rods.

Abstract: A fastening means utilizing, in combination, Velcro stripping and a sealing strip, thus providing that in releasably interconnecting a first panel member to a second panel member, the sealing strip carried between the panel members adjacent the Velcro strip and the co-operating Velcro strip is operative to cause an effective seal between the panel members, and is preferably resiliently deformed by the fastening interconnection of the Velcro stripping components.

Abstract: In a double-walled tank for low-temperature liquids, such as liquid gas, an inner tank forming a primary safety casing is enclosed by an outer tank forming a secondary safety casing. The outer tank is constructed of reinforced concrete. A layer of thermal insulation is provided between the inner and outer tanks. The inside surface of the outer tank at least on the side wall and base is covered first by a vapor-tight layer and then by a layer of a liquid-tight thermal insulation material, preferably polyurethane foam.

Abstract: Rectangular heat-insulating panels of a semi-rigid foam plastic, in particular a foam produced from polystyrene beads, are provided on both sides with a plurality of incisions which run at right angles to the principal plane of the panel and parallel to one end face. The four end faces each have matching tongue and groove profiles. The insulating panels may be used for the heat insulation of parts of buildings, especially of pitched roofs.

Abstract: This disclosure relates to an insulating system which is particularly adapted for insulating the walls, floors, ceilings and like structure of buildings and includes a panel having a hollow chamber or interior under negative pressure (vacuum) and being of a variety of external peripheral sizes and shapes to fit within areas defined by wall and/or floor and/or ceiling studs, beams or the like, a plurality of springs, chains or the like for supporting the panel in generally spaced relationship to an associated building wall, ceiling, floor or like structure, and a plurality of pin-like elements of relatively small cross-sectional configuration normally spaced from the exterior surface of the panel for contacting a limited exterior surface area of the panel only upon the springs, chains or the like becoming inoperative which would in the absence of the pin-like elements result in direct contact between the panel and the associated building wall, ceiling, floor or like structure and thus reduce the insulating eff

Abstract: A panel interconnectable with like panels for use in forming a sports surface has a substantially rectangular and planar member and an edge connector at at least one set of opposite edges including a first locking member extending from the lower surface of the panel at one edge and having a groove extending inwards from the end thereof and towards the one edge and terminating below the upper surface. A second locking member extending from the upper surface of the panel at the other edge, has a projection configured to engage in the groove to mate with the first locking member at the one edge of an adjacent panel to align the upper and lower surfaces of the panels. A plurality of these panels are advantageously assembled by the method according to the present invention to form a sports surface.

Abstract: A structural element in rectangular form folded along its longitudinal center forming a truss element in triangular faced polyhedrals when end edges of the structured element are connected to the corresponding adjacent, respective, end edges of like structural elements in an assembled polyhedral. The fold in the structural element assumes a dihedral angle well under 180.degree., approximating 110.degree., with the truss element used in forming a four triangular faced tetrahedron, 90.degree. with the truss element used in a cube, although this is an unstable structure in not presenting the structural shape integrity attained inherently with truss elements used in triangularly faced polyhedrals. Further, the structural element assumes a dihedral angle approximating 75.degree. with the truss element used in forming an eight triangular faced octahedron, and approximately a 42.degree. fold in the truss elements forming a twenty triangular faced icosahedron.

Abstract: In a ceiling assembly, a parallel array of horizontally elongated panels each having vertical major surfaces and a horizontal top flange and a plurality of spaced parallel horizontally elongated stringers extending above and transversely of the panels for supporting the panels, the stringers having horizontal flanges formed with slots in which the top edge portions of the panels are received. The slots are shaped to provide, in the stringer flanges, pairs of facing spring tabs to facilitate insertion of the top portions of the panels in the slots and to interlock with the panel top flanges.

Abstract: Apparatus for mounting associated roofing tile which in one form of the invention includes a grid of wires which comprises a plurality of first wires disposed in a first direction and a plurality of second wires disposed in a second direction. The second direction is generally perpendicular to the first direction. A first hook cooperates with each tile and one of the first wires.

Abstract: An elevated floor panel is disclosed formed of a sheet metal upper surface member and a sheet metal lower support member. The lower support member is provided with a plurality of apertures arranged in perpendicular rows across the panel. Integral legs formed of material displaced from the apertures are symmetrically arranged around each aperture and extend laterally to the upper surface member. Each leg is provided with a foot portion welded to the under surface of the surface member. The edges of the lower support member are bent laterally to provide sidewalls extending to the upper surface member and terminating in flanges welded to the upper surface member. The panel structure permits the panel to be supported at its corners and to sustain substantial loads with small load-induced deflections.

Abstract: A machine for packaging objects such as rolls of paper comprises a direction changing loading wheel to feed objects and groups of objects into closely grouped orientation in the wrapping machine for high speed passage through the machine in a continuous motion generally in a single direction and substantially at a single speed. A wrapper supply mechanism feeds sheets of wrapping material to lie between conveying belts above the article to be wrapped with the leading edge of the wrapper substantially ahead of the article or group of articles to be wrapped. A pair of vacuum wheels alongside the path of the article on axes skewed slightly outwardly from the article path pull the wrapper down in front of the article and allow it to pass underneath as the article passes so that the wrapper becomes wrapped around the top, front and bottom of the articles.

Abstract: A self-propelled sugar cane harvester has a picking and comminuting device, an inclined conveyor, a discharge conveyor transversely inclined conveyor, a pressure fan located in the region of an outlet end of the inclined conveyor to direct an air stream through a comminuted sugar cane stream, and an additional suction fan arranged to provide for a uniform air stream in the region of transition between the inclined conveyor and the discharge conveyor and in an inlet region of a discharge hood.

Abstract: A mowing implement essentially comprising a housing extending transversely of the direction of movement of the mowing implement, a plurality of mowing members rotatably journalled on said housing and a drive assembly arranged within said housing for driving the mowing members and formed by a sequence of gears including both driving gears connected with the moving members and at least four coupling gears drivingly interconnecting each adjacent pair of driving gears. All of the gears are small and are arranged in line so that the housing is narrow. The housing is made very rigid by fixedly interconnecting the top and bottom walls together by structure which supports the bearings for the coupling gears. The assembly is economical so that it can be replaced as a unit rather than being repaired.

Abstract: A mower having a casing, several disks located above the casing and bearing block means supported by the casing, and furthermore having a plate secured to the bearing block means and skid means connected to the plate for protecting the disks.

Abstract: A grass and ditch mower is provided having a novel floating cutting deck mounted to a novel extension arm assembly.

Abstract: A vacuum apparatus which may be supported by a tractor-lawn mower combination and which includes a collection bin and a vacuum producing impeller driven by a hydraulic motor for collecting grass clippings, leaves and similar refuse is presented herein. The impeller and hydraulic motor are located within the collection bin and provided with ducts to channel exhaust air through the bottom of the bin to muffle operational noise and increase the efficiency of the system.

Abstract: An elongated blade (21) for a rotary mower is fabricated from a nonrectangular blank (9) so that the lift portions (33, 34) formed on the trailing parts of the blade have radially outer peripheries (41, 42) which lie substantially on a circle (d) generated by the radially outer tips (46, 47) of the leading cutting edges (28, 29). This produces a blade with improved grass bagging characteristics due to greatly improved discharge of air entrained clippings.