Patent ID: 7000910
Filing Date: 2006-02-21
Classification: F16F

Abstract:
1. A suspension unit comprising: a lower frame; an upper frame vertically movably mounted on the lower frame; a link mechanism for connecting the lower frame and the upper frame; a magneto-spring unit for resiliently supporting the upper frame relative to the link mechanism; and a plurality of metal springs having opposite ends hooked on the upper frame and a portion of the link mechanism, respectively, wherein the link mechanism comprises a first torsion bar that produces a lifting force of the upper frame, wherein a second torsion bar is mounted on the upper frame and a contact plate secured to a portion of the link mechanism, and wherein when a displacement of the upper frame relative to the lower frame is greater than a predetermined value, the second torsion bar impinges on the contact plate to thereby produce a lifting force of the upper frame.