Three Wheel Handicapped Steering Propulsion Cycle
Three Wheel Handicapped Steering Propulsion Cycle report
Abstract: Traditional manual wheelchairs require considerable use and control of both arms for operation, thus adaptations are required for individuals with asymmetrical use of their arms. Building upon previous projects, the goal of this project was to create an accessory, to be installed on a standard wheelchair, which would allow full control of the wheelchair with only onearm/hand while addressing areas lacking in commercial products and previous designs, such as manufacture ability, attendant control, user comfort and ergonomics.After preliminary testing and analysis of three one-arm propulsion designs, the project team developed a design for a removable, lever-operated accessory which could be adapted to fit a range of the most popular standard wheelchair models. The propulsion system, connected to the main lever by a coupler link, consists of a dual gear-pawl assembly in which the desired direction of motion is chosen by moving a shifter to engage one of the two gears press-fit around clutches, each of which allows motion in only one direction, either forward or reverse. By including a neutral pawl position in which neither clutch is engaged, this design allows an attendant to propel and control the chair.Several modes of manual wheelchair propulsion may be found in the literature. These include the conventional hand-rim technique, lever-propelled, hub-crank and others.Systematic research has played an important role in the development and design of wheelchairs, in studies concerning vehicle mechanics and its interactions with the human movement system to better understand the wheelchair’s user interface.A change in propulsion mechanisms has been used and non-conventional techniques have been proposed to reduce the impact of the conventional wheelchair propulsion technique on the quality of life of handicapped persons.