Mechanism has variable traction to an overspeed safety device has rotary control member

The invention relates to a variable traction mechanism to an overspeed safety device rotatif.Le controller variable traction mechanism (5) comprises a rotary actuator (10), first and second wheels (14 , 15) pivotally connected to an elevator car (24) via first and second connecting elements (26, 27) and which run on opposite sides of a guide rail (12), said rotary actuator (10) including means for detecting when said first wheel (14) exceeds a predetermined speed of rotation and for blocking said first wheel (14) on said rotary actuator (10), a first spring (28) acting between said second wheel (15) and a first pivot (42) fixed on said rotary control member (10) and a second spring (30) acting between the shaft (32) of said second wheel (15) and a second pivot (43) fixed to said rotary actuator