GB356549A - Improvements in or relating to clutches for the transmission of motion from a constantly rotating driving shaft to a belt pulley or like device - Google Patents

Abstract

356,549. Friction clutches. WOTTLE, H., 56, Fernkorngasse, Vienna. Oct. 24, 1930, No. 31970. Convention date, Jan. 16. [Class 80 (ii).] To eliminate standing and running friction in a clutch for periodically connecting a belt pulley 6 to a constantly rotating shaft 1, the pulley 6 when disengaged rests on a fixed extension 23 of the bearing sleeve of the shaft, and when engaged is lifted clear of the sleeve and carried by the radially moving segmental friction driving clutch shoes 4, 5. The shoes which are pivoted on an arm 3 keyed to the driving shaft, are expanded through compression springs 18, plungers 12, 13, toggle links 9, 10, 11 and a sliding sleeve 7 by an operating ring 19 which is relieved of friction in the engaged position by virtue of the toggle links passing their dead-centre whereafter the sleeve 7 abuts against the arm 3 and the clutch is held in by the springs 18. The plungers 12, 13, which press on the springs through end nuts 17, slide in collared guides 14, 15 in the shoes and have a pin-and-slot connection 16 therewith. A spring pawl 20 with an inclined end 21 snaps over a flange 2<1> in the disengaged position and prevents undesired engagement such as under the influence of centrifugal force.