A cutting device is provided to replace a conventional lawnmower blade which offers improved safety, outstanding grass cutting ability, improved grass bagging suction, and a reduction in the strain on the engine. The device includes an elongated, downwardly curved rigid thermoplastic member having an upstanding airfoil at each distal end. Several elongated flexible tines extend outwardly away and downwardly from the member. The tips of these tines operate to effectively cut the grass while flexing for safety if an object is encountered, such as a rock or toe. The airfoils increase the suction within the mowing cavity to increase the grass bagging efficiency. The downwardly curved configuration presents the tips of the tines for grass cutting while reducing or eliminating the drag of the member on the grass.

Offset mower blade

Grass cutting device

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.

Rotary mower blade

A rotary lawn mower blade with improved combined mulching and shredding capability includes an outboard section having a leading cutting edge and a trailing edge. The trailing edge of the outboard section includes a plurality of teeth. The blade also includes a transition section having a leading cutting edge that is at least partially offset relative to the leading cutting edge of the outboard section. The transition section further includes a trailing edge having a partial tooth. Preferably, the plurality of teeth on the outboard section are twisted in either an inboard or an outboard direction. Additionally, the partial tooth can be twisted in an inboard direction. The blade also preferably includes a central mounting portion and an inboard section between the central mounting portion and the transition section. The inboard section also includes a leading cutting edge and a trailing edge.

Combined mulching and shredding blade

A rotary blade for lawnmowers and the like havng a plurality of flexible and resilient 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. Points of waekness may be provided to ensure that the blade members break off rather than cutting through an obstacle such as the operator's foot. In order to suit different existing machines the blade may have a specially adapted hub portion, and the blades may incorporate a step (38) to position the cutting edges correctly in relation to the machine's spindle. The blade may be provided with, for example, upturned vanes (26) to facilitate grass collection, and the tips of the blade members may be weighted (42) to provide sufficient flywheel effect for machines powered by reciprocating engines.

Blade for rotary lawnmowers and the like

The present invention is directed towards a rotary lawn mower blade designed to eject grass clippings away from the center of the blade. The rotary lawn mower includes a main body which has two opposing ends. The first end comprises a first leading cutting edge arranged opposite a first trailing edge. The first trailing edge has an upturned portion having sufficient height, length and configuration to redirect air flow generated when the main body is rotating to create pressurized air, thereby creating an increased force to disperse grass to the external environment. The second end comprises a second leading cutting edge arranged opposite a second trailing edge. The second trailing edge has an upturned portion having sufficient height, length and twist configuration to redirect air flow generated when the main body is rotating to create pressurized air, thereby creating an increased force to disperse grass to the external environment.

Lawn Mower Blade

Cutting blade assembly for rotary lawn mowers and the like

Yieldable mower blade

A blade for a rotary-scythe mower comprises alternate laminations (50, 51) of rubber, and rubber carrying nylon cords, the whole structure being vulcanised together after assembly. The mower is conventional and includes a boss (15) carried on the lower end of a vertical shaft (14) the blade being clamped between the boss and a plate (28) by a bolt (27a) which enters a threaded hole in the shaft (14); spacing washers (25) adjust the cutting height. The blade is shaped to have sharpened side-edges, formed wholly of rubber, and enlarged tip-portions (35).

Offset mower blade

Citations

Grass cutting device

Rotary mower blade

Combined mulching and shredding blade

Blade for rotary lawnmowers and the like

Lawn Mower Blade

References

Cutting blade assembly for rotary lawn mowers and the like

Yieldable mower blade

Blade assembly for a mowing machine

Mower blade construction

Related Papers (1)

Means for mulching leaves and the like