A bistable mechanism is proposed with symmetrical snap-through behavior between the two equilibrium positions. The mechanism is monolithic and does not require external axial load, as buckled beams. It consists of two pre-shaped beams of opposite curvature with similar properties and dimensions, which are connected after fabrication. The combination of the opposite pre-shaped beams, each having non-symmetrical bistability, results in total symmetric bistability. This symmetrical bistable mechanism provides the advantage of having the same switching force in the forward and backward directions. The concept of the new mechanism is presented, analyzed based on the snapping force curves, and tested experimentally on microfabricated prototypes.

提出了一种双稳态机制，在两个平衡位置之间具有对称的快速捕捉行为。该机构是整体式的，不需要像弯曲梁那样的外部轴向载荷。它由两个曲率相反，形状和尺寸相似的预成型梁组成，在制造后将它们连接起来。分别具有非对称双稳态的相对的预成形梁的组合导致总的对称双稳态。这种对称的双稳态机构具有在向前和向后方向上具有相同的切换力的优点。提出了这种新机制的概念，并根据捕捉力曲线进行了分析，并在微型原型机上进行了实验测试。