Design, stress analysis and determination of center of gravity on stair climber wheelchair

Not all facilities in Indonesia have supporting facilities for wheelchairs in order to access these facilities freely. Obstacles encountered especially not their specific path to enter, so had to climb the stairs. The problem is the absence of a special path to enter the access, so it must climb the stairs. The movement of the wheels to climb the stairs and sitting balance system of the patient become a major problem in this study. The purpose of this research is to make prototype of mechanical system in wheelchair so that can climb stairs easily and safely. In mechanical systems, the design of the wheel using three-wheel system which is arranged in parallel form a triangle. To balance the user's position, under the seats mounted screw system as a regulator of the seat tilt angle. This mechanical design planning takes into account the determination of the Center of Gravity (CoG) to ensure stability. Hopefully, this wheelchair prototype becomes a means of supporting mobility for the disabled to move to public facilities in Indonesia.