Abstract
The purpose of this study was to develop the new wheel-chair which had the function to drive straight by one-hand operation. To perform this purpose, the driving force transmission axis (DFTA) which had transmitted the driving force from the one side of wheel to another side of that was developed. The wheel-chair could drive straight by one-hand operation by the DFTA. The large torque, however, was generated in the DFTA, because the DFTA transmitted the driving force from the one side of wheel to another side by the axis of small diameter. Furthermore, the shear stress in the DFTA generated by this torque would lead to the DFTA break. The shear stress in the DFTA was calculated to examine the axial strength and durability. On the DETA of the wheelchair, the maximum shear stress calculated from the torque in driving was 39.53 MP and this was defined as the standard of the demand specifications as a strength and durability of the DFTA.
Highlights
A lot of events with a wheelchair are performed in a disability sports represented by the Paralympics, and various types of wheelchair are developed with depending on the degree or state of a physical handicap of the athlete, or the characteristics of sport event
An average of the torque in normal driving on the level ground was 3.9 Nm (SD = 0.6)
The torque driving on the bike roller treadmill was higher than that on the level ground in both of normal and hard driving
Summary
A lot of events with a wheelchair are performed in a disability sports represented by the Paralympics, and various types of wheelchair are developed with depending on the degree or state of a physical handicap of the athlete, or the characteristics of sport event. There is an athlete who must drive a wheelchair by only one hand because of loss of one arm or hemiplegia. Because an existence wheelchair for sport competitions is produced assuming both hands drive, such an athlete must drive a wheelchair by a difficult method to operate the driving wheel of right and left with one hand in turn. In a wheel-chair tennis player, even the hand with a racket must drive a wheel when a wheelchair drives straight. The purpose of this study was to develop the new wheel-chair which had the function to drive straight by one-hand operation
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