|
Traditionally, the mechanism of multi-functional wheelchair has multi degrees of freedom, and used multiple power sources to complete the multi motion function. The purpose of this thesis is to invent new multi-functional wheelchair with single degree of freedom. The multi-functional wheelchairs designed in this thesis include 1. Multi-functional wheelchair with sitting, lifting, and standing functions, and 2. Multi-functional wheelchair with sitting, lifting, standing, and lying down functions. The mechanisms proposed for multi-functional wheelchairs in this thesis have 1 degree of freedom. Hence, using only 1 power source drives the mechanism to achieve multi motion functions. The new design has the advantages of 1.simple operation, 2. high load bearing, 3.more stability, and 4 more safety. When the wheelchair standing up, the center of gravity of traditional standing wheelchair is moved forward, it needs to use more 2 wheels, the wheelchair will become six wheelchairs. In this thesis, first, by using the checklist method of Osborn, the multi-functional wheelchairs with single DOF are invented. According to theory of dimentional synthesis of mechanism, the dimentions of multi-functional wheelchair are synthesized. The center of gravity of new multi-functional wheelchair after standing still located between the front and rear wheels, no additional wheels needed. Then, by using Solidworks software, 3D drawing and engineering design of multi-functional wheelchairs are carried out. Applying SolidWorks Motion software, the kinematic analysis and simulation are carried out to ensure the security and stability in the operation. Finally, the narrow model of the prototype is manufactured to verify the theoretical results. The results of this research will enhance Taiwan''s R & D capability in the multi-functional wheelchair to enhance industrial competitiveness.
|