Patent ID: 8096385

Claim:
Belayer/descender safety device for cooperation with a rope, comprising: a frame, means for receiving said rope, said receiving means being in the form of a pulley rotationally mounted on the frame means for holding said rope, said holding means being pivotally mounted on the frame between an open position for positioning the rope in the receiving means and a closed position for cooperating with the receiving means to block the rope with respect to the receiving means when the holding means is coupled to the frame, means for controlling a speed of rotation of the pulley with respect to the frame, wherein the means for controlling the speed of rotation of the pulley include speed-reducing means slaving the increase in deceleration of said pulley to the increase of the speed of rotation of the pulley; wherein the speed-reducing means comprise an epicyclic gear including a satellite-holder rotationally mounted with respect to said pulley and bearing at least one double toothed satellite gear cooperating through engagement (i) with a crown gear extended on an inner periphery of said pulley, and (ii) with a crown gear extended on an inner periphery of said frame, toothings of said crown gears being shaped so that an engagement ratio between each of said crown gears drives the satellite-holder at a speed different from the speed of rotation of the pulley.