Dazenelevator considerable concentration and coordination

in Top Real Estate Developers Fri Jun 16, 2017 6:54 am
by luntanchen • 3 Posts

Visit any large department store, shopping mall, metro station, airport or stadium anywhere in the world and you are sure to find escalators carrying people quickly and safely to their Commercial Elevator. The escalator has become an integral part of the urban landscape. While passenger elevators we re in common use since the 1870s, it was not until 1899 that the Otis Elevator Company

introduced the world’s first commercially successful moving stairs. Otis Elevator Company has been safely and efficiently moving people for 150 years. Otis is the world’s largest manufacturer of elevators, escalators, moving walks and people movers. With 1.2 million instal- lations, 61,000 employees, and operations in more than 200 coun-tries, it’s safe to say that the world rides on Otis The rise of the modern escalator Although there had been several attempts to design and

build moving stairway systems prior to 1899, none proved safe or practical enough to come into general use. It was not until that year — when the Otis Elevator Company built the first step-type escalator — that the idea became commercially feasable. This original Otis design remains the basis for the escalator as we know it today.

The word escalator was coined by combining the Latin word for steps — “scala” — with the word “elevator.” The term remained a registered trademark of the company until 1950, when the U.S. Patent Office ruled it was in the public domain since escalator had become the generic name for a moving stairway. Finding a safer solution Designing a safe transition point — where passengers step on and off the escalator — was one of the major problems in creating a successful moving stairway. Anumber of methods had been attempted before Otis solved the problem. In one earlier design, as the moving steps reached the upper landing, they disappeared under a “V” shunt. The purpose of the shunt was to literally shove passengers off the stairs and onto the landing. This required them to take an awkward sidestep with one foot while the

other foot was still traveling forward. This called for considerable concentration and coordination on the part of the passengers — a difficult enough feat at the best of times, much less when one was burdened with parcels or attending small children. Another alternative was a system that employed a series of comb- like prongs that lifted the passengers’ feet off the treads when they reached the top. The prongs were designed to mesh with the treadcleats at the end of the ascending and descending runs. This was animprovement over the awkward “V” shunt system, but the 30–40 cm(12-16 in) prongs still posed a hazard. Passenger Lift were tempted toleap over the approaching prongs rather than risk being scooped off.Neither the awkward “V” shunt system nor the pronged-comb solu-tion was practical for the majority of users.

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