Patent ID: 8250965

Claim:
A jack system including a jack provided with a cylinder wherein slides a piston having an external end, said cylinder being provided with a first stop means, the jack system comprising: a body arranged around said jack and hinged about said external end of the piston, according to a pivot axis, said body includes second stop means and being able to occupy, relatively in relation to the jack and according to the pivot axis, a first angular position authorizing an extraction/retraction of the piston in relation to the cylinder, as well as a second angular position uniquely allowed when the piston occupies in relation to the cylinder an extracted position such that said second stop means is located beyond said first stop means in an extraction position of the piston in relation to the cylinder, the body occupying said second position providing the facing, according to the extraction position, of the first and second stop means; and an electromagnetic attraction/repulsion device including a first element fixedly mounted on said cylinder as well as a second element fixedly mounted on said body, said device being designed to provide the displacement of the body from said first position to said second position, and inversely, by attraction/repulsion of said first and second elements.