Abstract: A garden chopping/shredding apparatus has a frame provided with an upwardly open intake hopper on the frame having a lower end in which is in turn provided a generally horizontal blade plate and formed about the axis with a plurality of angularly spaced apertures. Respective flat blades carried on the blade plate have cutting edges above the apertures and a plurality of prechopping blades carried on the blade plate projecting upward therefrom have cutting edges inclined upward and inward toward the axis. The drive rotates the plate and the blades in a predetermined direction about the axis so as to define with the cutting edges of the flat blades a generally planar and circular orbit perpendicular to the axis and having an inner periphery offset radially outward from the axis and to define with the cutting edges of the chopping blades an upwardly tapered frustoconical orbit centered on the axis and having a small-diameter upper end and a large-diameter lower end.

Abstract: A cutter wheel for a brush chipper or the like has a support plate generally centered on, extending perpendicular to, and rotatable in a predetermined rotational sense about a central support axis. This plate is formed with a plurality of slots angularly equispaced about and radially equispaced from the support axis and with a plurality of screw holes each trailing a respective slot relative to the rotational sense. A plurality of blades each have an annular outer periphery formed as a succession of cutting edges. The outer peripheries of the blades are centered on respective blade axes and each blade has at the respective blade axis a throughgoing attachment hole. Respective attachment screws engage through the attachment holes with the screw holes, with one of the cutting edges directed forwardly in the rotational sense of the support plate. Thus with this system a new cutting edge can be brought up simply by loosening the respective screw and rotating the blade, then tightening the screw.