Elevator Mechanical Design Download 36

[Mozell Gentges]

This third edition of Elevator Mechanical Design benefits from a logical and clear arrangement of the topics and many worked examples. The author describes how to achieve the mechanical aspects of the design of an electric elevator, as well as discussing why the designs are implemented in a particular way. The principles and concepts of all the mechanical components of an elevator are discussed in detail, supported wherever necessary by mathematical analysis, figures and examples. A full description and comparison of international standards is also included.

Readership: Designers, manufacturers, operators, maintenance management and safety personnel, electrical, mechanical, electromechanical, transportation and vertical transportation engineers, passenger control operators in the elevator industry, researchers and students of transportation science and architects and building service engineers.

Chapters include:

1. Definition of the mechanical system and component parts
2. Suspension of car and counterweight
3. Types of drive
4. Elevator Machines
5. Brakes
6. Counterweight
7. Guiding the car and counterweight
8. Safety Gear
9. Buffers
10. Car Frame
11. Doors and door operators
12. Elevator hoistway and machine room

Click here to view the Table of Contents and Foreword.

Also available in a digital edition.

Hardcover 401 Pages 3 lbs.

Lubomir Janovsky was a Professor at the Faculty of Mechanical Engineering, Technical University of Prague. An elevator/escalator consultant and expert witness, he has been chairman or member of various prototype, technical and standard draft committees. The author has written numerous books and papers on vertical transportation and materials handling, published in many countries.

elevator mechanical design download 36

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About the Authors
Kelley Cramm, P.E., is an associate and mechanical technical manager, and Brad Chambon, P.E., is a mechanical technical manager at Henderson Engineers in Lenexa, Kan.

The purpose of hoistway venting is to allow smoke and hot gases to vent out of the elevator hoistway to the outside in the event of a fire. Contrary to popular belief, hoistway venting is not to allow the air to push and pull out of the hoistway due to piston effects so the elevator can operate correctly. If this were the case, the IBC would not allow exceptions. Note that hoistway venting requirements apply to traditional elevators with machine rooms and to machine room-less elevators.

Designing multistory buildings requires architectural teams to carefully plan elevator systems that meet current safety standards as well as address the unique needs of the space. This whitepaper will discuss mechanical, electrical, plumbing, and fire protection (MEP/FP) considerations for designing a safe and efficient elevator system.

Pumps that are generally 30 to 40 hp move hydraulic fluid under a piston to raise this type of elevator and then return fluid back into the tank to lower the elevator. Hydraulic elevators are advisable for shorter buildings, up to 5 stories. They also contain flammable liquid and must feature appropriate fire alarm and protection devices.

Traction elevators, on the other hand, are suspended by tensile cable and balanced by counterweights equal in weight to a half-loaded elevator. They are raised and lowered by moving the cable. Traction elevators are commonly installed in buildings that have more than 5 stories and use motors that are generally 15 to 20 hp.

Traction elevator machinery has traditionally been located in penthouse spaces above the elevator shaft; however, "machine roomless" elevators are now available for buildings up to 150 ft tall. This centralizes all machinery within the shaft, saving the client the cost of building a dedicated penthouse space.

Modern buildings are designed to contain a fire to the location where it starts, and floor plates generally are rated to prevent movement of smoke and growth of a fire. For this reason, care must be taken with shafts that penetrate multiple floor levels, because they are susceptible to collecting smoke from a fire or transferring smoke from floor to floor.

In the past, hoistway ventilation was the main approach to smoke control. When smoke was detected in an elevator shaft or lobby, vents in the top of the shaft would open to discharge smoke. Hoistway ventilation is becoming less preferable because it can exacerbate problems through stack effect, drawing smoky air from the fire floor through the shaft.

In most jurisdictions, a high-rise is defined as a building with an occupied floor set more than 75 ft above the lowest level of access from a fire department vehicle. Backup power systems are required for high-rise buildings and are usually powered by generators. Emergency lighting including elevator cab lighting is considered an emergency load, while elevator motors are backed up by generators as standby loads.

All high-rise buildings must have standby power for elevators, but not all elevators have to be capable of running at once during an outage. Generators should, therefore, be large enough to operate only one elevator in a group. Elevator controllers should also be programmed to operate just one elevator at a time while on backup power.

In the first phase, emergency recall, the elevator descends to the level of egress (primary-level recall). If the fire is on the main floor, the elevator goes down to another level (alternate-level recall).

The second phase of elevator recall, in-cab operation, enables firefighters to use recalled elevators to reach a fire. A warning light will alert firefighters if a fire in the elevator machine room has made an elevator ineligible to use.

The need for this critical system component has become clear in situations where fires have broken out in older buildings without recall. In a 2012 case in Chicago, a fire in a 21-story building resulted in the death of a resident when the elevator took her to the floor containing the fire. The building was constructed in 1952 and lacked elevator recall.

Sprinkler systems and fire alarmsNew high-rise constructions are now including self-evacuation elevators that are protected from fire and smoke, allowing occupants to flee a building safely much more quickly than using the stairs. Building self-evacuation elevators also represent a far more economical option than adding egress stairways to every floor of a high-rise.

Earlier versions of fire protection codes for elevator systems required sprinklers in all hoistways, elevator pits, and machine rooms. But newer code requirements are less focused on sprinkler systems and have more emphasis on fire-resistant and non-flammable construction. Newer codes also discourage sprinklers in elevator spaces, leaving them open for evacuation or fire department operations during a fire.

This third edition of Elevator Mechanical Design benefits from a logical and clear arrangement of the topics and many worked examples. The author describes how to achieve the mechanical aspects of the design of an electric elevator, as well as discussing why the designs are implemented in a particular way. The principles and concepts of all the mechanical components of an elevator are discussed in detail, supported wherever necessary by mathematical analysis, figures and examples. A full description and comparison of international standards is also included.
Readership: Designers, manufacturers, operators, maintenance management and safety personnel. Electrical, mechanical, electromechanical, transportation and vertical transportation engineers, passenger control operators in the elevator industry. Researchers and students of transportation science.Architects and building service engineers.
Chapters include: 1. Definition of the mechanicsal system and component parts 2. Suspension of car and counterweight 3. Types of drive 4. Elevator Machines 5. Brakes 6. Counterweight 7. Guiding the car and counterweight 8. Safety Gear 9. Buffers 10. Car Frame 11. Doors and door operators 12. Elevator hoistway and machine room
Hardcover 401 Pages 3 lbs.

There are various types of specializations in engineering that you can accomplish in the field of commercial construction. If you want to know your way around elevators, you should pursue an elevator or mechanical engineering career. But if you're a building owner looking for the best person to take care of your elevator system, this article will tell you what you need to know.

An elevator engineer is a trained personnel that can help maintain, repair, and install elevator systems in your building. They collaborate closely with architects and other construction professionals to integrate elevator or escalator units in various settings. Their duties include:

Maintaining your commercial property can take time and effort. There are various sectors in your business that you need to oversee and to help you ensure that all is in order, you need to hire a professional elevator engineer. To help you decide, here are some of their primary responsibilities:

Mechanical engineers use different methods to meet each client's needs regarding building codes, efficiency, and safety. In the planning and designing stage, mechanical engineers consider the materials and elevator access in building a reliable, long-lasting elevator system to prevent any elevator-related emergencies and injuries.

In addition, mechanical engineers must also design elevator cars to be more inclusive and accessible. Installing braille buttons, audible announcements, and wheelchair ramps is a great help to ensure that all passengers can comfortably use and access the elevator regardless of their physical abilities.

The elevator's hoist system is essential as it is responsible for lifting and lowering the elevator cars between floors. Its set of reliable components, which include the electric motor, gearbox, sheave, steel cable, and other safety features, make the elevator highly functional and safe to use.

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