LOADS AND STRESSES IN DISENGAGING PROCESS FOR SAFETY CLUTCHES WITH BALLS, RADIAL SPHERICAL ACTIVE RABBETS AND PRESSING SYSTEM ON EACH BALL - CÄƒtÄƒlin GAVRILÄ‚; Silviu POPA; Gheorghe MOLDOVEAN (Annals of the Oradea University: Fascicle Management and Technological Engineering, 2010)