CONSTRUCTION OF PORTABLE WHEEL-BARROW. A RESEARCH PROJECT MATERIAL ON CHEMICAL ENGINEERING
After detailed study on machines and levers, the construction work started as follows:-
The machine has scale of 1:5 in all parts of its dimensions. However, brief dimensions are given below:-
Upper surface of bowl – 850mm
Inner surface of bowl – 335mm
Stand height – 325mm
Diameter of wheel – 250mm
Diameter of shaft seating and the shaft 4mm
Thickness of type – 75mm
Few centuries ago, the task of conveying loads around was so cumbersome. Very minor loads could be carried from one point of the other. The distances covered during the period of weak was less whereas the time expended on the short covered distance was much. Also, there were no appreciable accomplishment of words, there were continually loss of man-power as much effort and energy was spent on conveying loads.
Loads were carried on human heads which was generally unsafe.
Consequent upon these limitations, man started devising means on how loads could be carried from one point to another with ease. Before 13trh century, wheel-barrow was first constructed in china. The type of wheel-barrow then had its wheel under the cargo box. This conveyor helped the Chinese then to execute most of their works. But, yet, smaller quantity barrow due to the weak mechanical strength of material for continuation.
In 13th century proper an improvement on the type of wheel-barrow that were in China was constructed and used in Europe. This type had its wheel at the front of the machine on like that of the Chinese which had its wheel at the back of the cargo. These conveyors in those days could only convey less loads and could withstand less stress due to the deficiencies in the strength of the materials used for construction.