Safety installation for elevators

Elevator safety installation of the type comprising a moving contact (108) fastened to the lower ends of carrying cables (107) wound on an electric winch (105) and a car (103) mobile along stationary guides (100-101) located under the moving contact (108) and connected to it, on the one hand, by means of direct mechanical coupling organs (141-144) which are mounted mobile between an active position in which they make the car (103) rigidly solid with the moving contact (108) and a retracted position in which they are inactive and, on the other hand, by means of a connecting cable (116) wound on a rotary drum (110) placed on the car (103), which is suspended from moving contact (108) by said cable (116) when the coupling organs (141-144) are in retracted position, characterized in that it is provided with means for automatic decoupling of the moving contact (108) and car (103), means comprising an electric circuit which is connected to the same source (117) as that supplying the circuit of winch (105) and which comprises, on the one hand, at least an electromagnet (118-119) associated with the coupling organs (141-144) and mounted so that it has to keep said organs (141-144) in active position as long as it is excited by the electric current flowing normally, while it has to release them as soon as the current is no longer supplied and therefore the current no longer flows and, on the other hand, a switch (121) inserted between the source (117) and the winch (105) and mounted so that it automatically stops in closed position as long as the coupling organs (141-144) are in active position and it is automatically placed in open position as soon as said organs (141-144) are in retracted position, these coupling organs (141-144) being associated with mechanical means (149-150) opposing the electromagnet (118-119) but with less force and which constantly pull these organs (141-144) toward their retracted position.