Walking Stretcher

this project deals with the designing and manufacturing of a stretcher, which can climb stair or move along very rough surface. The technical issues in designing of this stretcher are the stability and speed of the stretcher while climbing stairs, the steepness of the stairs is the important concern of this study. The uses of this special stretcher are, to transfer medicines for hospital and give freedom to the retired person or paralyzed patients to move anywhere on flat surface as well as stairs. We are in the process of development of a tri-wheel stretcher that has several new features than existing wheel and track based on universal stair for all place. A Three-wheel functions as ordinary wheel on flat surface, but has the ability to climb automatically when a defect to rolling is encountered. This wheels are consists of three tires, each wheel is on separate shaft. These shaft are located on vertices of an equilateral triangle. These triangular sets of wheels can neglate many types of terrain, rocks, sand and mud. It can also allow a vehicle to climb on small obstructions such as rocks, holes, and stairs. The wheels can also be gear-driven, two wheels are on rolling contact with the ground. The third wheel is at the top til the lower first wheel hit an obstruction. The obstruction prevents the lower front wheel from moving forward but it does not affect the motion of the driving axle. So, the top wheel is rolling forward into position as the new front wheel. This wheel usually lands on top of the obstruction and give the rest of the assembly to vault over the obstruction. Using of this stair vehicle, the human labor cost can be reduced as well as huge amount of loads can be transferred with less power consumption.