Spring device for the support wheels of a forklift truck

Springing for support wheels (5) of low lifting trucks arranged below the forks comprising a common spring device arranged in the transfer mechanism of the lifting movement to the support wheels (5). The spring device includes a cylinder (13), a piston (14), a spring package of cup springs (16) and an extending push rod that in the cylinder is connected a ring shaped element (17) located between the spring package and the cylinder end (19) through which the push rod extend. The piston is arranged in the other end of the spring package and the cylinder is via a return valve coupled in parallel with the load lifting hydraulic system of the truck so that the pressure in this pretensions the ring shaped element (17) towards the cylinder end proportionally to the load, so that springing does not take place until the dynamics forces overcome the pretension.