Safe rotary mower blade

Claim 2

A safe rotary mower blade comprising: a bar-shaped rotary mower blade having a spindle-receiving mounting hole and having sharpened edge portions adjacent the opposite ends thereof, said sharpened edge portions facing forwardly of the direction of rotation of the rotary mower blade; a rigid circular ring concentric of the spindle hole and being located beneath the blade adjacent the outer ends thereof and adjacent said sharpened portions; a pair of supplemental blades on the circular ring and respectively disposed adjacent opposite ends of the mower blade, said supplemental blades having forwardly facing sharpened edges oriented obliquely with respect to the mower blade; and means fixedly attaching the ring to said mower blade in spaced relation below the mower blade.

Claim 3

The mower blade according to claim 1 and including a second rigid ring disposed concentrically within said first-mentioned rigid ring and affixed to the blade in spaced relation therebelow, said second rigid ring being disposed adjacent the inner end of the sharpened portion of the bar-shaped blade.

Claim 4

The invention according to claim 1 and said supplemental blade also having a portion bearing against said mower blade and providing a bracket connection between the mower blade and the rigid ring.

Claim 5

A safe blade for a rotary lawn mower, comprising: an elongate bar-shaped mower blade having a central spindle-receiving mounting hole and also having opposite end portions for rotary movement about said spindle hole, said blade also having leading edge portions relative to the direction of rotation, said leading edge portions being Obliquely formed to produce a fan effect as the blade is revolved to induce upward movement of air to draw the blades of grass upwardly for cutting; a rigid and circular ring concentric of said mounting hole and being disposed adjacent the outer ends of the blade, said ring being disposed at a level beneath the sharpened edge of said leading edge portions to prevent engagement of the blade by a person''s foot or shoe under the edge of the lawn mower housing and also to obstruct outward impelling of stones and other objects due to whirling of the blade; and means attaching and suspending said rings in spaced rotation below the blade, said means including a pair of rigid bracket plates, each affixed to the circular ring adjacent a respective end of the mower blade, each of said bracket plates extending forwardly of the adjacent leading edge portion of the mower blade, and having a sharpened forwardly facing edge portion extending obliquely forwardly and outwardly toward the ring from the sharpened leading edge of the mower blade, and removable fasteners detachably attaching said bracket plates of the ring to the mower blade.

Claim 6

A safe blade for a rotary lawn mower, comprising: an elongate bar-shaped mower blade having a central spindle-receiving mounting hole and also having opposite end portions for rotary movement about said spindle hole, said blade also having leading edge portions relative to the direction of rotation, said leading edge portions being Obliquely formed to produce a fan effect as the blade is revolved to induce upward movement of air to draw the blades of grass upwardly for cutting; a rigid and circular ring concentric of said mounting hole and being disposed adjacent the outer ends of the blade, said ring being disposed at a level beneath the sharpened edge of said leading edge portions to prevent engagement of the blade by a person''s foot or shoe under the edge of the lawn mower housing and also to obstruct outward impelling of stones and other objects due to whirling of the blade; and means attaching and suspending said rings in spaced rotation below the blade, said means including a pair of rigid bracket plates, each affixed to the circular ring adjacent a respective end of the mower blade, each of said bracket plates extending forwardly of the adjacent leading edge portion of the mower blade, and having a sharpened forwardly facing edge portion extending obliquely forwardly and outwardly toward the ring from the sharpened leading edge of the mower blade, and removable fasteners detachably attaching said bracket plates of the ring to the mower blade.