A novel monofilament trimmer line is provided for reducing noise, reducing air drag and increasing durability by having a non-round cross-sectional shape defined as a polygon with three to six sides wherein the vertices between adjacent sides have been replaced with generous circular arcs, the arcs of a parabola, or even other arc shapes so long as the arc is convex and contains no sharp edges and wherein each arc is tangent to the two adjacent sides with a smooth and continuous transition, and the sides of the polygon are either straight or slightly convex, but not concave.

A novel monofilament trimmer line is provided for reducing noise, reducing air drag and increasing durability by having a non-round cross-sectional shape defined as a polygon with three to six sides wherein the vertices between adjacent sides have been replaced with generous circular arcs, the arcs of a parabola, or even other arc shapes so long as the arc is convex and contains no sharp edges and wherein each arc is tangent to the two adjacent sides with a smooth and continuous transition, and the sides of the polygon are either straight or slightly convex, but not concave.

A fixed head walk reel mower has a frame supported for rolling over the ground. A reel cutting unit comprising a rotatable reel and a cooperating bedknife has a fixed orientation on the frame. The frame pivotally carries a ground engaging pivotal rear traction drum that can be selectively disposed in two different mowing positions when cutting grass at lower or higher height of cut ranges, respectively. This allows a single mower to cut grass at lower heights of cut on golf course greens as well as at higher heights of cut on tee boxes while minimizing degradation in cutting or power performance.

A fixed head walk reel mower has a frame supported for rolling over the ground. A reel cutting unit comprising a rotatable reel and a cooperating bedknife has a fixed orientation on the frame. The frame pivotally carries a ground engaging pivotal rear traction drum that can be selectively disposed in two different mowing positions when cutting grass at lower or higher height of cut ranges, respectively. This allows a single mower to cut grass at lower heights of cut on golf course greens as well as at higher heights of cut on tee boxes while minimizing degradation in cutting or power performance.

A helical-bladed cutting reel includes a central shaft having a central axis of rotation, and a plurality of helical blades. Each of the blades extends along a respective helical path on an outer surface of the central shaft. A direction of each respective helical path has both an axial component and a circumferential component relative to the central axis of the central shaft as it extends across the outer surface of the central shaft. Each of the helical blades is welded directly to the central shaft. In preferred embodiments all of the blades are continuously autogenously welded directly to the central shaft.

A walk reel mower has a traction frame that carries a rotatable cutting reel that pushes grass against a bedknife for cutting the grass. A handle assembly extends rearwardly and upwardly from the traction frame. The handle assembly carries a handle that is gripped by a user to operate the mower as the user walks on the ground behind the traction frame. The handle assembly has upper and lower portions that have a telescopic connection to one another to adjust the height of the handle above the ground to accommodate users of different heights.

An autonomous mobile work system (20) includes a drive wheel (34) that is connected to a frame (24) and a rotating blade assembly (36). The rotating blade assembly (36) includes a blade assembly axis of rotation (38) and is connected to the frame (24) within a housing (26). The mobile work system (20) further includes a single motor (40) operably connected to the blade assembly (36). The motor (50) includes a motor output shaft (44) and the motor output shaft (44) includes an output shaft axis of rotation (46). The mobile work system (20) still further includes a gear box (50) operably connected to the drive wheel (34) and the motor output shaft (44). The single motor (50) urges rotation of both the rotating blade assembly (36) and the drive wheel (34). The gear box (50) can include a planetary gear set (104) including a ring gear (110) defining cavities (120) at its outside diameter (124). A locking shaft (126) can rotate between an engaged position and a disengaged position with one of the cavities (120).

An apparatus for trimming plant material includes a rotatable tumbler through which the plant material is to be axially propagated while rotationally tumbling, and a plurality of cutting reel systems adjacent the tumbler. The plurality of cutting reel systems includes a first cutting reel system adjacent the tumbler, and a second cutting reel system adjacent a landing zone of the rotatable tumbler. The landing zone is an angular range about the axis of the tumbler within which plant material tends to land on the tumbler after tumbling through a central volume of the tumbler.

To provide a moving apparatus including cylindrical rotating bodies each having a surface section that functions as a driving wheel or a working member. A moving apparatus includes three or more cylindrical rotating bodies, and a plurality of coupling members, each of which couples two of the cylindrical rotating bodies together such that an angle between the cylindrical rotating bodies is smaller than 180, where each of the three or more cylindrical rotating bodies includes a motor, and an exterior body configured to be rotated by the motor, where the three or more cylindrical rotating bodies are configured to form a closed polygonal shape to hold an elongated member R including a rope, whereby the moving apparatus is movable along the elongated member.

An electric walk behind greens mower having a traction drum split into a first half and a second half, each half rotatable at a different speed to provide traction drive and steering for the mower in response to actuation of hand controls by an operator, or in response to commands from an electronic controller based on the signals from a proximity sensor on the mower. The electric walk behind greens mower includes a pair of electric traction drive motors, one of the electric traction drive motors rotating each half of the split traction drum.