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Elevator - Wikipedia
An elevator (American English) or lift (Commonwealth English) is a machine that vertically transports people or freight between levels. They are typically powered by electric motors that drive traction cables and counterweight systems such as a hoist, although some pump hydraulic fluid to raise a cylindrical … See more
Pre-industrial era
The earliest known reference to an elevator is in the works of the Roman architect Vitruvius, who reported that Archimedes (c. … See moreRound-trip time calculations
History
In 1901, consulting engineer Charles G. Darrach (1846–1927) proposed the first formula to determine elevator service.
In 1908, Reginald P. Bolton published the first book devoted … See moreManual controls
In the first half of the twentieth century, almost all elevators had no automatic positioning of the floor on which the cab would stop. Some of the older freight elevators were controlled by switches operated by pulling … See moreMost elevators are built to provide about 30 to 40 years of service, as long as service intervals specified and periodic maintenance/inspections by the manufacturer are … See more
Elevators can be rope dependent or rope-free. There are at least four means of moving an elevator:
Traction elevators
Geared traction … See moreAnti-crime protection
The anti-crime protection (ACP) feature will force each car to stop at a pre-defined landing and open its doors. This allows a security guard or a receptionist at the landing to visually inspect the passengers. The car stops at … See moreWikipedia text under CC-BY-SA license Elevator - Simple English Wikipedia, the free encyclopedia
The History of Elevators From Top to Bottom
Aug 11, 2019 · In 1835, architects Frost and Stuart 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 by the early 1870s, …
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Elevator | Regulations, Maintenance & Modernization
elevator, car that moves in a vertical shaft to carry passengers or freight between the levels of a multistory building. Most modern elevators are propelled by electric motors, with the aid of a counterweight, through a system of cables and …
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