Patent ID: 7637192
Filing Date: 2009-12-29
Classification: B27B,Y10S,Y10T

Abstract:
1. A saw chain comprising: a cutting link having a forward cutting link rivet hole and a rearward cutting link rivet hole, and further having an upper cutting edge disposed at a first height relative to a guide bar rail and a depth gauge having a rear face opposing the cutting edge and an upper surface disposed generally at or below the first height, a gullet formed between the cutting edge and the depth gauge; a drive link having a forward drive link rivet hole and a rearward drive link rivet hole, the drive link coupled to the cutting link via a rivet engaging the forward cutting link rivet hole and the rearward drive link rivet hole, wherein in a first position a longitudinal first centerline passes through centers of the rivet holes and the rivet, the rivet further including a second centerline perpendicular to the longitudinal first centerline and generally coplanar with the drive link, the drive link including a top edge having a rearmost portion that is generally the closest point to the upper cutting edge of the cutting link and disposed a first distance from the second centerline; a tail extension distance defined by the distance between the top edge rearmost portion and the depth gauge rear face; a trailing edge disposed generally below the top edge, a concavity formed between the top edge and the trailing edge, the concavity having a forward most portion disposed below the upper edge rearmost portion and a second distance from the perpendicular second centerline of the rivet, wherein the second distance is shorter than the first distance such that the forward most portion is disposed in front of the upper edge rearmost portion, thereby defining a concavity depth and forming a tail on the drive link; wherein as the saw chain traverses a straight run of a guide bar the rearmost portion protrudes into the gullet the tail extension distance and the top edge is disposed generally at or below the upper surface of the depth gauge; and wherein as the saw chain traverses a nose of the guide bar the position of the tail moves relative to the depth gauge.