SAFETY CLUTCH Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: clutch member 1 is secured on shaft 2 in holder 4. Clutch member 3 is installed in guides 8 on slider 7. Sleeve 9 is installed in guides 10 in series with slider 7. Made on sleeve 9 are grooves 22 for shifters 21 of double-arm lever 20. Screw 19 secured in center of lever 20 engages with nut 18 in reel 14 installed on shaft 15 and coupled with holder 4 by means of torsional spring 16. Sleeve 9 is pressed to holder 4 by spring-loaded telescopic pushers 23 coupled by joints 26 with post 25 on holder 4. Rotation of holder 4 in opposite direction is prevented by ratchet pawl 28. Clutch is engaged when driven shaft 15 is turned by spring 16. Screw 19, turning into nut 18, moves along axle and shifts sleeve 9 through lever 20 and shifters 21 overcoming force of spring of pusher 23. Slider 7 brings clutch members 1 and 3 into engagement. EFFECT: enhanced overload protection of mechanisms.