Abstract: A work vehicle includes an inverter circuit (42) configured to provide electric current to a traveling motor unit (21, 22) based on an inverter drive signal, a target signal generation unit (51) configured to generate a control target signal for the inverter circuit (42) based on an operation detection signal, an inverter drive signal generation section (41) configured to generate an inverter drive signal based on the control target signal and output the inverter drive signal to the inverter circuit (42), a trouble detection section (53) configured to detect a vehicle trouble based on a state detection signal, and a signal superposition section (56) configured to superpose a pulsatory signal on the control target signal if the trouble detection section (53) detects a vehicle trouble and output a resultant superposed control target signal to the inverter drive signal generation section (41).

Abstract: A vegetation trimmer with a spool and hub assembly has a cutting filament wound around the spool. The free end of the filament extends through an aperture in the hub into the cutting plane. The spool and hub are rotated at a high rate to allow the filament to cut vegetation. The spool includes a plurality of arms which engage with arms on the hub. When the spool is acted upon, the arms on the spool disengage with the arms on the hub to permit relative rotation of the spool to the hub to feed additional filament into the cutting plane. An indexing feature is used to regulate the amount of additional cutting filament that is allowed to be fed into the cutting plane.

Abstract: A trimmer head for use in a flexible line rotary trimmer including a housing adapted to be operatively connected to the trimmer to effect rotation of the head and a spool operatively connected to the housing for rotation therewith. The spool defines at least one inwardly extending line receptor channel, preferably formed by a plurality of inwardly tapered walls so as to be polygonal in cross-section. So configured, the channel walls will securely grip the cutting line upon the line being inserted in the channel and wound about the spool. To provide uniform winding of the line, a plurality of cam, cam abutment and sliding surfaces are operatively connected to the housing and spool such that when the spool is manually rotated relative to the housing in the drive direction, the spool is caused to reciprocate axially within the housing evenly distributing the line about the body of the spool.

Abstract: A self-sharpening cutting blade for use in a disc-mower or mower-conditioner achieved by treating a cutting blade in a manner creates a hardness gradient within all or a portion of the blade thickness, said gradient causing the blade to exhibit self-sharpening characteristics during use.

Abstract: An agricultural harvesting machine, in particular a self-propelled forage harvester, has a chopper drum that includes chopping blades, a sharpening device that is assigned to the chopper drum and is drivable via a drive for sharpening the chopping blades, wherein the sharpening procedure for sharpening the chopper drum is activated when the agricultural harvesting machine is in a non-working mode.

Abstract: A tool head of a trimmer is provided, and has a gear mechanism housing and a rotatably drivable tool shaft that is mounted in the housing. Held upon the tool shaft is a hub portion that rotates with the tool shaft. On that side that faces the hub portion, the tool head is provided with at least one stripping edge, which has a radial component that extends from the inside to the outside, and which projects beyond the contour of the hub portion.

Abstract: A mower deck cleaning device for a rotary mower for removing clippings from the inside of the mower blade housing. A tubular conduit is mounted on the mower so as to extend through the deck of the mower. A garden hose may be attached to the conduit to flow water through the conduit. A rotor mounted on the conduit receives the water from the hose and projects a rotating pattern of pressurized fluid for cleaning the inside of the housing.

Abstract: The primary feature of the invention is a nozzle end which extends downward through a hole in the deck of a rotary mower and has a plurality of orifices, some of which are parallel to the deck and some are angled downward at an angle in a range of 1° to 45°. The orifices are radial from the axis of the nozzle end. The cleaning is done by supplying water to the orifices at household pressure while the mower is running at mowing speed. The nozzle having the nozzle end may be installed in the deck or manually held in place during use.

Abstract: A yard trimming system for attaching to an undercarriage of a lawn tractor. The yard trimming system includes a cutting assembly for cutting plants growing from a ground surface. The cutting assembly comprises a sleeve member and a disk member rotatably mounted to a second end of the sleeve member. A pair of cutting members is mounted on a perimeter edge of the disk for cutting the plants. A mounting assembly is provided for pivotally mounting the cutting assembly to the undercarriage of the vehicle. The mounting assembly preferably comprises a support member with the sleeve member being mounted on a first end of the support member. A pulley assembly is mounted on the support member for selectively providing power from a motor of the vehicle to the cutting assembly.

Abstract: There is provided a mower having a high pressure fluid pump powered by a mower engine and communicated to a fluid jet assembly. The pump receives associated fluid from a mower reservoir. An output fluid stream is discharged from a fluid jet under sufficient pressure to sever associated vegetation and impact upon a mower diffusing means.

Abstract: A mobile lawn maintenance apparatus includes an implement mounting assembly for mounting an implement relative to the apparatus base which permits rotation of the implement about a horizontal axis and pivoting the implement about a vertical axis. An implement drive shaft, to which various implements may be interchangeably secured, is rotatably mounted in a bearing assembly which is secured to a distal end of the implement mounting assembly. The implement drive shaft is driven by a drive belt connected between an implement drive pulley on the implement drive shaft and a drive pulley mounted on a drive shaft of an engine mounted on the frame of the apparatus. The implement mounting assembly telescopes and is spring biased to urge to implement drive pulley away from the engine drive pulley to maintain constant tension on the drive belt during rotation of the implement attached to the implement mounting assembly.

Abstract: A self-powered brush cutter provided with a carrier having motorized ground engaging elements mounted via tandem arms, an articulated boom and a cutter head attachment. The articulated boom includes an angular adjustment mechanism to adjust the angle of the cutter head attachment and to maintain this angle. The cutter head attachment includes a rotary blade and blade guards partially enclosing the plade and provided with apertures that are so configured as to allow the passage of a potentially damage blade.