Spline element for seat in a vehicle

Claim 1

A spline element for a seat of a vehicle, which can be adjusted according to the height and weight load, comprising: an operational cylinder defining an enclosed pressure gas compartment; a pair of pistons adjustably disposed within said cylinder adjacent opposite ends thereof; each of said pistons being equipped with through flow channels leading from the gas compartment to the opposite sides of said pistons; a locking valve for each of said pistons which can close the flow channels on the rear side of the respective piston. one of said pistons forming a height adjusting piston and having a rod which leads from the operational cylinder as a stop end of the spline element, its locking valve being operable from the outside by a tappet which extends in the axial direction through the piston rod; the other of said pistons being formed as a floating piston, its locking valve being operable against the resistance of a lock spring by a weight adjusting piston which, under even pressure on both sides, can be inserted against the floating piston; means on said floating piston for mechanically limiting the return stroke of said weight adjusting piston; the other stop end of the spline element being formed by the piston rod of said weight adjusting piston which is drawn out of the operational cylinder; and a spring of the spline element being propped by said other stop end and by the operational cylinder.