09-10-2014, 11:37 AM
Abstracts: From about the middle of the 19th century, elevators were powered, often steam-operated, and were used for conveying materials in factories, mines and warehouses. In 1823, two architects Burton and Hormer built an ‘ascending room’ as they called it, this crude elevator was used to lift paying tourists to a platform for a panorama view of London. In 1835, architects Frost and Stutt built the ‘Teagle’, a belt-driven, counter-weighted, and steam-driven lift was developed in England. In 1846, Sir William Armstrong introduced the hydraulic crane, and in the early 1870s, hydraulic machines began to replace the steam-powered elevator. In 1853, American inventor Elisha Otis demonstrated a freight elevator equipped with a safety device to prevent falling in case a supporting cable should break. This increased public confidence in such devices. But now days electronically operated machines are fitted with electromagnetic brakes, speed control, governing mechanism and smooth operations at very high travel speed. In this project, a design of safety system is presented including some mathematical study and analysis. The elevator is actually fitted in a house and based on the condition and dimensions, the safety system is designed. The safety system includes hydraulic circuit and the design is based on downward motion is case of failure when maximum load is there. The hydraulic circuit is shown in this report. The aim behind this project is to provide cheaper system for domestic users with very less moving parts and hence less maintenance. This design must not consume large space. The power source of elevator is solar and the design is for physically impaired people specially so travel times are a bit slower than conventional one. In upcoming chapters, the readers will study the whole procedure and steps included in the design. Here, the study of manufacturing processes is not done.