where can i find a free source of information about elevators?

Question

iam a mechanical engineer works on thyessen elevators and i have no information about them , just i want free e-books or sheets or documantation

Answer 1

General Elevator and Escalator Information


History of Elevators
From ancient times through the Middle Ages, and into the 13th century, man or animal power was the driving force behind hoisting devices.

By 1850 steam and hydraulic elevators had been introduced, but it was in 1852 that the landmark event in elevator history occurred: the invention of the world's first safety elevator by Elisha Graves Otis.

The first passenger elevator was installed by Otis in New York in 1857. After Otis' death in 1861, his sons, Charles and Norton, built on his heritage, creating Otis Brothers & Co. in 1867.

By 1873 over 2,000 Otis elevators were in use in office buildings, hotels and department stores across America, and five years later the first Otis hydraulic passenger elevator was installed.

The Era of the Skyscraper followed.... and in 1889 Otis revealed the first successful direct-connected geared electric elevator machines.

In 1898 overseas business had added to the company's growth, and Otis Brothers merged with 14 other elevator entities to form the Otis Elevator Company.

In 1903 Otis introduced the design that would become the "backbone" of the elevator industry: the gearless traction electric elevator, engineered and proven to outlast the building itself. This ushered in the age of high-rise structures, ultimately including New York's Empire State Building and World Trade Center, Chicago's John Hancock Center, and Toronto's CN Tower.

Throughout all these years, Otis innovations in automatic controls have included the Signal Control System, Peak Period Control, the Otis Autotronic System, and Multiple Zoning. Otis is a world leader in developing computer technology, and the company has revolutionized elevator controls, generating dramatic improvements in elevator response time and ride quality.
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How Elevators Work
In a geared or gearless traction system (used in mid-rise and high-rise installations, respectively), the elevator car is supported in a hoistway by several steel hoist ropes, usually two sheaves, and a counterweight. The weight of the car and counterweight provides sufficient traction between the sheaves and the hoist ropes so that the sheaves can grip the hoist ropes and move and hold the car without excessive slipping. The car and counterweights ride along vertical guide rails to keep them from swaying.

The machinery to drive the elevator is located in a machine room usually directly above the elevator hoistway. To feed electricity to the car and receive electrical signals from it, a multi-wire electrical cable connects the machine room to the car. The end attached to the car moves with it, so the cable is called the "traveling cable."

A geared machine has a higher-speed motor, and the drive sheave is connected to the motor shaft through gears in a gear box, which reduce the rotational speed of the motor shaft to a lower drive-sheave speed. The gearless machine has a slow speed motor, and the drive sheave is connected directly to the motor shaft.

In a hydraulic system (used primarily in low-rise installations, where moderate car speed is acceptable), a car is connected to the top of a long piston that moves up and down in a cylinder. The car moves up when oil is pumped into the cylinder from a reservoir, raising the piston. The car is lowered when the oil returns to the reservoir.

The lifting action can be direct (piston connected to the car) or roped (piston attached to car via ropes). In both methods, the work done by the motor pump (kinetic energy) to lift the car to a higher elevation gives the car the ability to do work (potential energy). This energy transfer occurs each time the car is raised. When the car is lowered, the potential energy is used up, and the energy cycle is complete. The up and down motions of the elevator car are controlled by the hydraulic valve.
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How Escalators Work
In 1899, Charles D. Seeberger joined the Otis Elevator Company, bringing with him the name escalator (which was created by joining scala, which is Latin for steps, with elevator). The Seeberger-Otis union produced the first step-type escalator made for public use, and it was installed at the Paris Exhibition of 1900, where it won first prize. Mr. Seeberger eventually sold his patent rights to Otis in 1910.

As we approach the year 2000, Otis' centennial anniversary in the escalator business, Otis continues to look to the future and strives to improve Otis escalators. The mechanics of how an escalator works are noted below.

The Landing
The floor plates are level with the finished floor and are either hinged or removable to permit access to the machine spaces under them.

The comb plate is the piece between the stationary landing and the moving step. It slants down slightly so that the comb teeth fit between the cleats on the steps. The front edges of the comb teeth are below the surface of the cleats.

The Truss
The truss is the mechanical structure that bridges the space between the lower and upper landings. The truss is basically a hollow box made up of two side sections joined together with transverse braces across the bottom and just below the top. The ends of the truss rest on concrete or steel supports.

The Tracks
The track system is built into the truss to guide the step chain, which pulls the steps through an endless loop. There are two tracks: one for the front of the step (called the step-wheel track) and one for the trailer wheel of the step (called the trailer-wheel track). The relative position of these tracks causes the steps to appear from under the comb plate to form a staircase, and disappear back into the truss.

The reversal track at the upper landing rolls the steps around the top and starts them back in the opposite direction. An overhead track ensures that the trailer wheels remain in place as the step chain is turned back on itself.

Answer 2

There are many online sources available where you can find the best and accurate information about the elevator. Also, many elevator company's website are available from where to you can get some useful information about elevators.

Answer 3

I will never use an elevator again!! If you are working as a service engineer on these elevators and don't even have the instruction manual how can I ever feel safe?

Answer 4

i'll tell you right now, they go up they go down, and they take you there.