LIMIT TORQUE CLUTCH FOR THREAD TIGHTENING TOOL Russian patent published in 1997 - IPC

FIELD: mechanical engineering. SUBSTANCE: limit torque clutch has loading block incorporated within housing 1 and formed as drum 8 with poles 9 and V-shaped flexible members 10 gathered to form multiple-tier packs. One leg of flexible members 10 of each pack is conjugated with drum wall and other leg periodically biases respective floating retainer 6 in radial direction to receptacle 5 of disk 4 of shaft 3. Predetermined torque is set by rotating drive gear 13 engaged with toothed gear 12 of drum 6. When resistance moment and torque are equalized, shaft 3 is stopped. When handle 2 is pivoted, retainers 6 run over cylindrical surface of disk 4 to get into subsequent receptacle 5. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 dwg