Inner and outer conical spring sections with axially movable plug

A spring system comprising:

• an axially movable plug formed with a generally conically shaped outer surface which provides the plug with a wide base end portion and a narrow inner end portion;
• a radially outwardly extending flange formed on the base end portion of the plug;
• a spring formed of an elongated strand made of a springy, wire-like material, wound into coils to form an inner coil spring section and an outer coil spring section integrally joined together by a common coil, with the outer spring section being co-axial with and surrounding the inner spring section and plug;
• the inner spring section overlaying and closely surrounding the plug outer surface from about the plug narrow inner end portion to about the plug flange, so that the successive coils of the inner spring section increase in diameter for closely conforming to the portions of the plug outer surface which the respective coils overlay;
• with the common coil being located adjacent the plug flange;
• the outer spring section generally extending along the length of the plug, around and spaced from the plug and the inner spring section, with the outer spring section having a free end coil engaged with a support surface;
• a free inner end of the inner spring section being engaged with a support;
• the plug and said support surface being movable relatively towards and away from each other for applying a compressive force, in the generally axially direction of the plug and spring sections, whereby the coils of the inner spring section tightly engage the surface of the plug as the plug relatively moves within the inner spring section for resiliently stretching the inner spring coils around the plug outer surface and for compressing the outer section coils axially between the plug flange and said support surface.