The proposed idea aims at replacing the current safety mechanisms used by the elevators (i.e., governors) which are rope-based safety mechanism to rope independent, actuated by pneumatic and hydraulic cylinders. The proposed safety mechanism is lightweight and mounted on the top of the elevator. The mechanism involves a pneumatic cylinder actuating a hydraulic master cylinder using a class 1 lever for mechanical advantage. The hydraulic cylinder will pressurise the brake fluid and supply it to the callipers mounted on the elevator body. Callipers will cling to the guide rails upon actuation, thus stopping the elevator in very short distance. The effective force to be stopped by the callipers was calculated and parts were designed accordingly. Analyses of parts are done by considering maximum forces acting on hydraulic calliper mount and lever arm for varying thickness. Through calculations and analyses, the proposed system was found to be safe and reliable.
The proposed idea aims at replacing the current safety mechanisms used by the elevators (i.e., governors) which are rope-based safety mechanism to rope independent, actuated by pneumatic and hydraulic cylinders. The proposed safety mechanism is lightweight and mounted on the top of the elevator. The mechanism involves a pneumatic cylinder actuating a hydraulic master cylinder using a class 1 lever for mechanical advantage. The hydraulic cylinder will pressurise the brake fluid and supply it to the callipers mounted on the elevator body. Callipers will cling to the guide rails upon actuation, thus stopping the elevator in very short distance. The effective force to be stopped by the callipers was calculated and parts were designed accordingly. Analyses of parts are done by considering maximum forces acting on hydraulic calliper mount and lever arm for varying thickness. Through calculations and analyses, the proposed system was found to be safe and reliable.
Several Latin American countries have recently drafted policy (Engineering for the Americas, Organization of American States, Lima Declaration, 2004) to enhance and improve engineering education specifically with the development of that region in mind, thereby creating a cadre of engineers trained to consider their discipline within the context of regional economic growth. India has become a leading producer of engineers and technologists, dramatically enhancing the country's competitiveness in the global economy. On the other hand, India also continues to be a country plagued by socioeconomic disparities. Should India, as well, be creating engineers focused on development problems of India in addition to producing globally competitive engineers? Some of the socioeconomic disparity in India could be alleviated by adopting suitable policies that provide opportunities to more people to attain an affordable education, thereby reducing the poverty level or the gap between the rich and the poor; there is evidence that India is pursuing some of these policies. India provides an interesting example for Latin America, as it seeks to become globally competitive like India, but to also engender economic development and reduce poverty in the region. The objective of this paper is to discuss preliminary findings, and suggest a framework for understanding the relationship between engineering, technology and development.
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