in parallel to it the connecting piece 48 in one piece changes over in each case into an end piece 42 39 and 44 39 of the two turn parts of the two coil turns 42 44 delimiting the spring expansion i e the spring segments 34a 34b and the rod shaped connecting piece 48 are made from one single wire the connecting piece 48 is reinforced with respect to the wire of the adjacent spring turns 42 44 of the spring segments 34a 34b as shown in fig3 the connecting piece 48 extends to the end pieces 42 39 44 39 of the spring turns 42 44 the reinforcement of connecting piece 48 is carried out by a corresponding enlargement of its diameter as shown in fig1 the two spring segments 34a 34b of which in the shown embodiment the lower segment 34b for example has only two spring turns 44 are coiled in the same direction in which case both spring segments 34a 34b are cylindrical and have the same diameters however according to other preferred embodiments of the invention the segments may deviate from one another with respect to the diameter as well as with respect to the shape by being developed for example in a conical shape or in the manner of a so called miniblock spring resulting advantageously in areas in a desired elastic softness and overall height of the coil spring fig2 shows a preferred embodiment of the invention in which the two spring segments 43a 43b of the coil spring 43 are coiled in opposite directions the coiling of the two spring segments 34a 34b in.