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. To overcome the limitations of conventional bistable mechanisms,this paper proposes a novel type of bistable mechanism with linear negativestiffness and large in-plane lateral stiffness. By connecting the novelnegative-stiffness mechanism in parallel with a positive-stiffnessmechanism, a novel quasi-zero stiffness compliant mechanism is developed,which has good axial guidance capability and in-plane lateralanti-interference capability. Analytical models based on a comprehensiveelliptic integral solution of bistable mechanism are established and thenthe stiffness curves of both conventional and novel bistable mechanisms areanalyzed. The quasi-zero stiffness characteristic andHigh-Static-Low-Dynamic-Stiffness characteristic of the novel compliantmechanism are investigated and its application in constant-force mechanismand vibration isolator is discussed. A prototype with adjustableload-carrying capacity is designed and fabricated for experimental study. Inthe two experiments, the effectiveness of the proposed quasi-zero stiffnessmechanism used in the field of constant-force output and vibration isolationis tested.

A bistable mechanism with linear negative stiffness and large in-plane lateral stiffness: design, modeling and case studies