Patent ID: 8381625
Filing Date: 2013-02-26
Classification: B23D,B27B,Y10T

Abstract:
1. A circular saw blade comprising: a substantially planar main body defining a rotational axis for cutting operation, the planar main body having an essentially circular periphery in which are formed a plurality of annularly spaced tip support portions which follow a generally circular path of travel upon rotation of the main body about the rotational axis, and a plurality of cutting tips affixed by brazing to the tip support portions of the main body, each tip support portion having a forward leading surface oriented generally radially relative to the rotational axis and having an adjacent shoulder surface oriented generally normal relative to the forward leading surface to extend generally in the circular path of travel, each cutting tip having a mounting base with a rearwardly facing surface configured to mate with the forward leading surface of a respective tip support portion and with an inwardly facing surface configured to mate with the shoulder surface of the respective tip support portion, each forward leading surface of a tip support portion having a protrusion projecting in the direction of the circular path of travel and engaged in a mating recess formed in the direction of the circular path of travel in the rearwardly facing surface of the respective cutting tip, the protrusion of the forward leading surface of the tip support portion being in the shape of a curvilinear convexity having a radius of between about 0.2 mm and about 1.0 mm, and the mating recess in the rearwardly facing surface of the cutting tip being in the shape of a curvilinear concavity having a radius substantially corresponding to the radius of the protrusion of the forward leading surface, each shoulder surface of a tip support portion having a recess formed generally radially inwardly with respect to the rotational axis and engaged by a mating protrusion projecting radially inwardly from the inwardly facing surface of the respective cutting tip, the protrusion of the inwardly facing surface of the cutting tip being in the shape of a curvilinear convexity having a radius of between about 0.2 mm and about 1.0 mm, and the recess in the shoulder surface of the tip support portion being in the shape of a curvilinear concavity having a radius substantially corresponding to the radius of the protrusion of the inwardly facing surface of the cutting tip, wherein the recesses and protrusions are formed in the plane of the blade and are of the same radius across substantially the entire planar depth of the blade, the brazing of the cutting tips to the tip support portions of the main body extending along the mating surfaces thereof and forming two respective mechanical locks between the protrusions and mating recesses, with one mechanical lock located generally radially relative to the rotational axis and the other mechanical lock located generally normal relative to the one mechanical lock to extend generally in the circular path of travel, each cutting tip having a cutting edge disposed generally opposite the two mechanical locks, the locations of the mechanical locks in relation to one another and to the main body counteracting multiple forces which act against the cutting tip in differing directions in the plane of the main body during rotational cutting operation of the blade.