Patent ID: 7874720

Claim:
A vertical mixer tub for mixing environmental materials, the mixer tub comprising at least one auger having a plurality of blades disposed thereon, the mixer tub further comprising at least one access slot extending through the sidewall of the mixer tub, the improvement characterized by an apparatus comprising: a) a post having first and second ends defining a longitudinal axis therebetween; b) mounting means for rotatably mounting the post to an outer sidewall of the mixer tub; wherein the mounting means further comprises first and second mounting brackets rotatably attached to the first and second ends, respectively, of the post; c) rotation means for rotating the post about its longitudinal axis when mounted on the mixer tub; and d) at least one knife extending from the post whereby the at least one knife is configured to move through the at least one access slot into the mixer tub when the apparatus is mounted on the outer sidewall of the mixer tub and the post is rotated about its longitudinal axis, the combination of the at least one knife and the auger blades providing a scissors-like cutting action for cutting the environmental material when the auger is rotating.