Improvement of a Tri-Star Climbing Trolley Wheels Performance for Optimal Operation

Ordinary hand trolleys can climb over the stairs however, the climbing motion generated by simply rolling over the stair is not smooth due to the frictional force in between the edge of the stair and the wheel. The aim of this paper is to improve the performance of Tri-Star climbing trolley wheels for optimal operation. The design modification was done by selection of suitable bearings, materials and design the wheel frame. Engineering principles were used to evaluate the load capacity, force and stress distribution on the wheel mechanism. Auto CAD software was used for wheel frame design. The results shows that the spherical roller bearings can withstand both radial and axial load for increased load on the trolley. The wheel frame design showed that the trolley can withstand increased load with better stress distribution while as the deflection of the trolley under increased load. The trolley can operate well without touching the edge of the step.