SAW BAR OF CHAIN SAW Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: saw bar has casing with supporting surface for saw chain and saw chain supporting roller positioned in front part of casing in the proximity of zone, where saw chain changes direction of movement. Supporting roller has two side disks embracing a part of casing. Supporting surface of casing and radial surface of disks define supporting surface of bar, which has arched slot in the zone, where chain transfers from roller on casing. Slot has concave surface with depth at least equal to 0.006 of saw bar length. Casing surface disposed between roller disks may be further provided with one or several openings or slots, which may be filled with consistent lubricant. EFFECT: increased efficiency and simplified construction. 3 cl, 1 dwg