靜力平衡機構係指一個或多個自由度的機構，可在任意姿態下維持機構本身所內涵的能量，使負載可以停在空間中的任意位置。在許多民生用品上，例如檯燈、手機架等，都是使用靜力平衡機構的產品；但如果負載的重量改變，就得仰賴使用者自行調整該機構中的彈簧。為簡化使用者在更換負載時的調節步驟，本研究提出一組二自由度、可變負載、具自動調節功能的靜平衡機構。本機構係由一組彈簧法的靜平衡機構與一組由彈簧驅動的自動調節機構所組成。當負載變化時，該自動調節機構中的齒輪則會帶動齒條以調整彈簧的有效長度，並允許機構在任意姿態下進行調整。本研究以電腦輔助設計工具進行細部設計，並模擬該機構的總位能變化，也製作原型機以驗證該機構的可行性。原型機經過實驗驗證，調節後可在負載為600g、1000g、1300g下達到靜平衡的條件。

Statical balancing mechanism is a mechanism with one or multi degree-of-freedom. The mechanism can position the payload anywhere in the space by remaining the total potential energy of the mechanism in any posture. The statical balancing mechanisms are widely used in consumer products like lamps, phone mounts. However, when the payloads are changed, the springs of the device have to be adjusted by the users manually. In this study, an innovative device with two degree-of-freedom statical balancing mechanism, and automatic adjustment for variable payload is presented. Springs’ effective length in the mechanism can be adjusted simultaneously by the transmission of the gear and racks. The payload can be changed in any posture through the proposed method. The performance of the innovative design is verified through computer-aid simulation and prototype testing. The simulated results show that the total position of the mechanism maintains constant during the motion. The prototype is able to achieve the statical balancing condition when the payload is 600g, 1000g, and 1300g.

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