Spring system comprising an adjustable spring

A spring system having an adjustable spring force comprising at least one magnet, said magnet having a magnetic field, at least one conductor passing direct current being disposed in said magnetic field, said conductor being displaceable relative to said magnet, said magnet being formed by a number of pole pairs disposed along the path of displacement of said conductor, each of said pole pairs enclosing an air gap, having a predetermined cross-section and a predetermined spacing from another of said pole pairs, said direct current carrying conductor displaceable in said air gaps being a wire bent substantially in undulative form in the direction of displacement, and coiled so as to form a number of windings disposed one behind the other in the direction of the displacement, said number of windings being equal to said number of pole pairs, each of said windings having at least one turn and having substantially the same cross-section and spacing from another of said windings as the cross-section and spacing of each of said pole pairs, first and second magnetic fluxes being generated by the direct current in said wire and by the magnetic pole pair having said wire disposed therebetween, respectively, said first and second magnetic fluxes being of equal directions, said second fluxes between poles of adjacent pole pairs being opposite to one another, the undulating wire having a half-wave spacing substantially equal to the spacing between adjacent pole pairs.