Abstract:
This invention provides a jack system (2) provided with a cylinder (14) provided with stop means (32). It also comprises:a body (36) hinged about an end (18) of the piston, the body comprising stop means (54) and being able to occupy a first angular position authorising the extraction of the piston, as well as a second angular position uniquely allowed when the piston occupies a position such that the means (54) are located beyond the means (32) in an extraction position (34), the body occupying the second position providing the facing of means (32, 54); andan electromagnetic attraction/repulsion device (64) designed to provide the displacement of the body (36) from the first position to the second position, and inversely.