密碼鎖是一種方便操作，因應鑰匙攜帶不便而發展出來的鎖具類型。本研究之目的為利用一套系統化的方法，進行多段式可變號機械式密碼鎖的概念設計。首先介紹機械密碼鎖及其定義與發展歷史，其後探討密碼鎖的構造與分類，並進行專利分析。密碼鎖依其構造可分為：單段式、順序式、重複式、及多段式等四種類型；依其專利應用層面可分為：腳踏車鎖、金庫鎖、行李箱鎖、及按鍵鎖等四種類型。多段式密碼鎖同時具備順序式與重複式之特性，因此藉由其構造特性，可歸納出多段式密碼鎖的設計需求與限制，進而考慮具五桿以下之已有一般化鏈圖譜，利用創意性機構設計方法，配合設計需求與限制，合成出58種可行多段式密碼鎖的機構設計圖譜，並提出一套退化流程，使其包含所有密碼鎖之現有設計。最後針對已得之58種設計構想進行評估，選出按鍵鎖及轉盤鎖中較符合實際需求之設計，進行整體設計，並得到一種新型之多段式密碼鎖。

Combination lock is an easy-using kind of lock. It was invented to solve the inconvenience of carrying and taking care of keys. The purpose of this study is to synthesize mechanism design concepts of multi-step mechanical combination locks based on a systematic approach. Firstly, the classifications of mechanical locks are introduced, and the definitions and development of mechanical combination locks are described. Then, the mechanism and patents of combination locks are analyzed and discussed. Mechanical combination locks can be classified into four types, based on the structure of mechanisms, including the one-step type, sequential type, repeatable type, and multi-step type. They can also be classified based on functions into four types, including bicycle lock, trunk lock, coffer lock, and push-button lock. The one-step, sequential, and repeatable combination locks are further analyzed to conclude their structural characteristics as well as design requirements and constraints of the multi-step combination locks. Based on Yan’s creative mechanism design methodology, 58 feasible designs are synthesized systematically. A degeneration process is provided to identity all existing combination locks. By evaluating these concepts, one of the 58 feasible designs is chosen for detail design, and one new combination lock is obtained.

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