A trimmer head or trimmer head assembly for a trimmer is provided herein. The trimmer head may include a base plate defining an axial direction, a pivot head, and a blade retainer. The pivot head may be attached to the base plate. The blade retainer may include a radial arm rotatably mounted to the base plate to rotate relative to the base plate between a first position at which the radial arm is circumferentially aligned with the pivot head and a second position at which the radial arm is circumferentially spaced apart from the pivot head.

A lawn mower robot includes a rotating plate rotatably mounted on a bottom surface of an inner body; and a plurality of blades coupled to an edge portion of the rotating plate to be unfolded in a centrifugal direction and folded in the direction of the center of the circle, and spaced apart from each other in a circumferential direction of the rotating plate to cut grass while rotating around a rotating shaft of the rotating plate, wherein at least one of the blades has a cross-sectional shape of a parallelogram and is formed of a plate having a predetermined width in a longitudinal direction.

Trimmer heads for trimmers are provided. A trimmer head includes a drive plate defining a lug slot, and a locking lug, the locking lug movably positioned in the lug slot and movable between an unlocked position and a locked position. A trimmer head further includes a drive plate cover connectable to the drive plate such that the locking lug is disposed between the drive plate and the drive plate cover. A trimmer head farther includes at least one operational head, the at least one operational head connectable to the drive plate. The connected operational head is locked to the drive plate when the locking lug is in the locked position and the connected operational head is unlocked from the drive plate when the locking lug is in the unlocked position.

A mowing machine may include a central cutting deck generally disposed in a neutral mowing plane and a wing cutting deck pivotable with respect to the central cutting deck. A main gearbox may be connected to a wing gearbox by a wing driveline. The main gearbox may be disposed a sufficient distance forward of the central cutting deck and the wing cutting deck to permit the wing cutting deck to pivot about a hinge in a range of motion without disconnecting the wing driveline from either the main gearbox or the wing gearbox.

A mower apparatus has a tool bar mounted on wheels has a center section and right and left wing sections pivotally attached to the center section. When the tool bar is in an operating position the wing sections extend laterally from the center section perpendicular to the operating travel direction, and in a transport position the wing sections extend rearward or forward from the center section. A plurality of mowing units is attached to the tool bar such that when the tool bar is in the operating position each mowing unit extends rearward from the tool bar, and when the tool bar is in the transport position each mowing unit extends upward from the tool bar.

A cutting blade piece protective structure that prevents an obstacle from coming into direct contact with a blade portion of a cutting blade piece, saving light weight, saving a replacement cost at the time of breakage, and inhibiting lawn mowing performance by the cutting blade piece, is provided, and the lawn mower that includes the blade disk to be rotationally driven and at least one cutting blade piece attached to the outer peripheral portion of the blade disk, a blade guard for preventing an obstacle from coming into contact with the blade portion of the cutting blade piece is provided on the cutting blade piece. Preferably, the blade guard is attachable to and detachable from the cutting blade piece.

A high-efficiency cutting system for an autonomous mower provides a multiple blade tip cutting radius for a cleaner cut, and more complete mow. The system includes a spinning blade disk provided within a housing including a vertical standoff. The blade disk includes a first pair of cutting blades located between the center of the blade disk and the circumference of the blade disk, and a second pair of cutting blades located radially inward from the first pair of cutting blades. The cutting blades extend downward and away from the blade disk at an angle.

In a rotary mower having ten generally horizontal cutter disks forming a total cutting length along the cutter bar of 16 feet, the discharge opening containing the parallel conditioner rolls and a parallel transfer roll has a width of at least 125 inches. This allows a first outermost one of the ten disks and approximately one half of the next adjacent disk to be mounted on the cutter bar outwardly of the discharge opening. A convergence system then includes only first and second impellers with the first impeller mounted on the first disk for rotation therewith and the second impeller mounted on an upper support above the impeller so that the second impeller hangs downwardly toward the second disk for contacting the cut crop and mounted immediately adjacent with the second impeller having a peripheral edge located at or immediately adjacent the vertical plane of the side of the discharge opening.

A cutter assembly has a crossbar, cutter blades, and blade pins. The crossbar defines bar openings. Each cutter blade defines a blade bolt opening and first and second blade edges. The blade pins are each adapted to be inserted through one of the bar openings and one of the blade bolt openings such that the head portions of the blade pins are within one of blade recesses of the cutter blades. Bolt key surfaces of the blade pins engage bar key surfaces of the crossbar to prevent rotation of the blade pins relative to the crossbar. The cutter blades are each operable in first and second configurations, where the first blade edges are in a leading position in the first configuration and the second blade edges are in a leading position in the second configuration.

A rotary lawnmower blade having replaceable blade components pivotally attaching to a blade base provides a user with a plurality of cutting edges and cut margins and also to provide replaceable blade components which may be bought in bulk for keeping a sharp edge available without having to replace and entire blade or sharpen a dull blade.