Patent ID: 7775144
Filing Date: 2010-08-17
Classification: B23D,Y10T

Abstract:
1. A disk saw blade having a circular saw chain mounted around the circumference of a circular disc, the saw chain comprising driving links, connecting links and cutting links, wherein the chain is guided by the driving links in at least one chain groove arranged around the periphery of the disc, and a projecting part of each driving link projects radially inwards to make contact with the bottom of the groove, wherein the bottom of the groove has radial projections distributed around the disc circumference and the driving link has a cam surface on the part that projects radially inwards for interaction with a respective radial projection, wherein the chain when driven, moves from a neutral position in which the chain is loosely mounted around the circumference of the disc and the projecting part of the respective driving link is loosely inserted between two adjacent radial projections, to a working position in which the chain is tensioned around the circumference of the disc and the cam surface on the respective driving link is in contact with the associated radial projection, wherein the length of the saw chain is matched to the radius (r 0 ) of the disc, so when the saw chain and the disc are arranged concentrically in the neutral position, the saw chain is loosely mounted in the circumferential direction of the disc, wherein a radius (r sb ) to the bottom of the groove of each driving link is shorter than a radius (r id ) to the projecting part measured along the same radial line as said radius (r sb ) and shorter than a radius (rμ)to a radially outer end of each projection, wherein the cam surface on each driving link is designed to cause the saw chain to be displaced generally radially outwards along a respective radial projection by a camming action of the radial projection during rotation of the disk to take-up the circumferential looseness and tension the saw chain in a way that the chain is held onto the disc as a result of the tension created by the camming action.