SAWING TOOL OF STRAP SAW Russian patent published in 1999 - IPC

FIELD: forestry and wood-working industry. SUBSTANCE: sawing tool has drive pulley 1, driven pulley 2 and saw strap 3 embracing pulleys 1 and 2. Band inner peripheral surface cooperates with outer circumferential surface of disk 4 and band outer peripheral surface is in contact with saw strap 3. Band outer peripheral surface of each pulley is defined by long conical surface 6 and short conical surface 7, which are joined one with another along annular line. Long-to-short surfaces ratio is 2-4. Inclination angle of short conical surface 7 relative to line extending in parallel with pulley axis is 4-6 deg and inclination angle of long conical surface 6 relative to the same line is 1.5-2 deg. Saw strap 3 is inclined at an angle equal to that of conical surface 6 and adjoins this surface. Saw strap 3 abuts with lower edge of its smooth end against short conical surface portion disposed at long and short surfaces junction zone. Construction of sawing tool allows strap saw to be reliably fixed on pulleys without usage of auxiliary devices. EFFECT: increased efficiency and wider operational capabilities. 2 dwg