Patent ID: 8365336
Filing Date: 2013-02-05
Classification: B08B

Abstract:
1. A rotatable saw blade for routing through a sewer line wherein the saw blade is rotated in only one rotational direction about a rotation axis during use for the purpose of separating debris or roots from the interior wall of the sewer line, the rotatable saw blade comprising: a rotatable body having an arcuate portion having a forward cutting edge which moves along a substantially circular path when the blade is rotated about the rotation axis and wherein the circular path of movement of the forward cutting edge is oriented in a plane which is substantially perpendicular to the rotation axis of the blade and so that the path of movement of the forward cutting edge through any roots or debris being separated from the interior wall of a sewer line through which the saw blade is routed is necessarily arcuate; the arcuate portion of the body defining a plurality of V-shaped teeth arranged in succession along the forward cutting edge thereof wherein each V-shaped tooth has a leading edge portion and a trailing edge portion which meet at an apex and wherein the leading edge portion of each tooth is substantially parallel to the direction of intended movement of the blade along the length of the sewer line so that the leading edge portion forms an angle of zero degrees with the direction of intended movement of the blade along the length of the sewer line and the trailing edge portion of each tooth forms an angle with respect to the direction of intended movement of the saw blade along the length of the sewer line which is between about twenty-two and sixty-three degrees; and the arcuate portion further defines a notch between a pair of successively-arranged teeth wherein the notch has a depth of at least about 0.5 inches as measured from the apex of an adjacent tooth.