Adjustable-stroke spring and shock absorber device

A spring and shock absorber device comprising a strut, a sliding rod mounted to slide inside the strut and to cooperate therewith to delimit a compression shock-absorbing chamber and an expansion shock-absorbing chamber both containing a shock-absorbing liquid and interconnected by throttle means, the compression shock-absorbing chamber being connected by a connection duct to at least one accumulator containing a gas under pressure, and a control piston for displacing a control rod between positions which are retracted or extended relative to the strut, wherein the control piston is associated with the control rod which is coaxial with the sliding rod and which includes a compression end-of-stroke abutment and an expansion end-of-stroke abutment, and a stroke c of the control rod is greater than a distance d between the compression end-of-stroke abutment and an immediately adjacent end of the compression shock-absorbing chamber when the control rod is in an extended position.