Patent ID: 7930873

Claim:
A peripheral cutting and mulching blade comprising: a pair of substantially triangular mounting sections, each having an upper and lower surface, each said mounting section including a first edge having a semi-circular cut-out about a mid-point of the first edge, a second edge having a cutting blade projecting perpendicular to the mounting section, and a third edge having a cutting blade projecting perpendicular to the mounting section; said cutting blades including one of which extends from the upper surface and one of which extends from the lower surface; said first edge of each mounting section abutting the other to form a central aperture from said semi-circular cut-outs, and said mounting sections including holes for mounting said blade to a collar on a horizontal rotary shaft; said cutting blades including two of which extend from the upper surface on opposing blades of said mounting sections when mounted on the collar and two of which extend from the lower surface on opposing blades of said mounting sections when mounted on the collar; each cutting blade having the general shape of a right triangle with each cutting blade of each surface being oppositely oriented, wherein said cutting blades each include a diagonal surface; and said first edge of the mounting sections includes a tabbed end and a shallow deformed end and when mounted on the collar the tabbed end of one mounting section overlaps the shallow deformed end of the abutting first edge of the other mounting section, whereby when mounted on the collar the mounting sections interlock.