The invention relates to a spring device for the motion drive of a movable component from a rest position into a displaced position. The inventive spring device includes a preloaded spring and a gas spring. The movable component is loaded into the displaced position by the preloaded spring. A pressurized gas-filled cylinder of the gas spring include a first end closed by a first end plate and a second end closed by a second end plate and the interior of which is subdivided by an axially displaceable piston into a first working chamber and a second working chamber. The first working chamber and the second working chamber are connected to each other via a restrictor, and the piston has a piston rod which is led through the first working chamber and is led to the outside through the first end plate in a sealed manner, the piston rod having a free end being fixed to the movable component or a stationary component.
In such spring devices, the extension force is composed of a sum of the force of the preloaded spring and the force component of the gas spring that is present in the extension direction, which is primarily intended to effect damping of the extension movement of the piston rod. The damping force depends on the pressure of the gas in the cylinder. As the pressure rises, the damping force also rises.
As resistances of the components to be moved increase, the forces of the spring must also increase. This alone requires a high expenditure of force for the manual movement of the movable component out of the displaced position into the rest position. If increased damping of the movement from the rest position into the displaced position is also intended to be provided, the increased damping further increases the required expenditure of force.