Saw blade for a saw having reciprocating blades

A saw blade for a power saw having two such blades arranged adjacent and parallel to each other and reciprocating in opposite directions, said saw blade comprising;

• an elongate blade member extending in a longitudinal direction and having a top edge, saw teeth along a bottom edge, an outside surface extending between said top and bottom edges on one side of said blade member, and an inside surface extending between said top and bottom edges on an opposite side of said blade member;
• said outside surface being formed with a longitudinal shoulder partway between said top and bottom edges and extending in said longitudinal direction, said shoulder facing upwardly away from said bottom edge;
• said teeth comprising first, second and third types of teeth;
• said first type of teeth being located at said outside surface and being set outwardly to project beyond said outside surface;
• said second type of teeth comprising non-set teeth located at said inside surface and being ground from bottoms thereof upwardly and outwardly with respect to said blade member;
• said third type of teeth having upper roots located further outwardly towards said outside surface than roots of the second type of teeth, said third type of teeth being set inwardly but not projecting beyond the teeth of said second type;
• and
• the three types of teeth cooperating when cutting a workpiece to bias said bottom edge to move in a direction from said outside surface towards said inside surface, the first type of teeth being subjected to forces acting outwardly away from said inside surface and the second and third types of teeth being subjected to forces acting inwardly towards said inside surface to produce a resultant force acting on all three types of teeth which is directed inwardly towards said inside surface.