Having this mechanical advantage of 3:1, it has been calculated that a single man working the winch could raise 150kg, assuming that 50kg represent the maximum effort of a man can exert. The simplest Romans crane is the trespasses, which consists of a single beam jib, a winch, a rope, and a block containing three pulleys. The Romans adapted the Greeks cranes and developed it further. The heydays of crane in ancient times come during Roman Empire when construction activity soared and buildings reached enormous dimensions. The development of lift machine or crane has reached through different time starting the first crane for lifting heavy load was invented by ancient Greeks in the late 6 th century BC. "Design and Development of Portable Crane in Production Workshop: Case Study in BISHOPTU AUTOMOTIVE INDUSTRY, Ethiopia." American Journal of Mechanical Engineering 5, no. Tadesse, Mulugeta, and Tesfahun Meshesha.American Journal of Mechanical Engineering, 5(2), 41-50.
Design and Development of Portable Crane in Production Workshop: Case Study in BISHOPTU AUTOMOTIVE INDUSTRY, Ethiopia. "Design and Development of Portable Crane in Production Workshop: Case Study in BISHOPTU AUTOMOTIVE INDUSTRY, Ethiopia." American Journal of Mechanical Engineering 5.2 (2017): 41-50.
American Journal of Mechanical Engineering. The maximum carrying capacity 3 ton, and maximum lifting height is estimated as greater than greater than 2.96m from the ground run by using 3KW electric motor rotating 2830/3620 rpm. Since the crane operates hydraulically there is piston cylinder device which is connected to the vertical column and boom for lifting up and down the objects. The crane uses four wheels, of which two of them in the front are connected to the base using permanent joint and the rear wheel is connected to the base using roller. There are also other bars for supporting purpose which are connected to the basic link (vertical column) using bolt connection. The Vertical column is secured on the cross bar that is welded to the side bars making the base using bolt connection. Vertical column and boom) connected each other by using pin joint. The crane has two loaded side bars to make the base and two links (i.e. In this project we designed and produced a portable crane which can lift a heavy load with a maximum capacity of 3 ton. The main advantage of the project is having detail design of the mechanism in the production workshop of BISHOFTU AUTOMOTIVE INDUSTRY Ethiopia is that it is portable, moveable, and easy for operation. This portable crane uses a hydraulic system to lift a heavy loads applying only small force.
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