Creative Design of a Convertible Six-bar Sofa Bed Mechanism

• Main Authors: Hsing-Ling Chiang, 蔣星苓
• Other Authors: Li-chun Wang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/96435686595315368821

碩士 === 國立臺灣科技大學 === 機械工程系 === 97 === This thesis deals with the creative design of a six-bar linkage for convertible sofa bed. The proposed design is novel in the sense that it effectively adopts the dead-center configurations of the mechanism to increase the stability of the sofa bed, as this feature has not been found in previous patens and studies. In this research, several possible kinematic structures of six-bar linkages for the new sofa bed mechanisms are first synthesized based on Yen’s creative mechanism design methodology, in which the dead-center configurations are incorporates as design constraints. Among the synthesized structures the three types of the Stephenson’s linkage are chosen for further study, and analytical procedures for dimensional synthesis of function generator with two and three precision points are established. By in depth evaluating the results of the dimensional synthesis, it is found that the Stephenson type Ⅲ linkage is more suitable for convertible sofa bed than the other two types. A prototypical model of the mechanism has been made according to the synthesized dimensions to verify the usefulness of the presented methods.