This article evaluates the correlation between the ratio of sheave diameter to nominal rope diameter and rope service life. In recent years, a movement has gained ground in the elevator industry toward the introduction of more compact and smaller designs. Efforts to cut energy consumption and costs have driven down the size of individual components.…
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This paper looks at how accurately hoist ropes should be measured to achieve minimum wear and maximum life. There is a difference of opinion between installers on how equal hoist rope tensions need to be in order to achieve the best performance. Some believe that an engineer’s thumb is a suitable tool for judging when…
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This research examines the effects and usage of small-diameter suspension ropes. This paper was presented at Lucerne 2010, the International Congress on Vertical Transportation Technologies and first published in IAEE book Elevator Technology 18, edited by A. Lustig. It is a reprint with permission from the International Association of Elevator Engineers (website: www.elevcon.com). This paper…
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This study explores how transient vibrations arise and why rope vibrations occur. by Phil Andrew, MSc, MPhil and Stefan Kaczmarczyk, PhD Rope vibrations in an elevator system usually result in a ride quality that is unacceptable. A well-known phenomenon is “transient” vibration, which occurs at a specific point in the elevator travel, usually near the…
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Mitsubishi Electric provided vertical-transportation solutions for this mixed-use project in downtown Los Angeles. by Chris Cole and Matt Jaskiewicz It had been nearly 20 years since downtown Los Angeles had seen a bonafide skyscraper development. Though the area had grown significantly with the addition of the Staples Center, the Nokia Theater and a major expansion…
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An examination of a typical late-19th-century service proposal. Contracts and proposals for serv-ices have always been critical aspects of the elevator industry’s business operation. In a manner similar to that of today, 19th-century proposals for services provided the prospective client with the information needed to make a decision whether to purchase a given elevator. In…
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A look back at the events of the Elevator Contractors of America (ECA) annual membership meeting held in March in Sarasota, Florida. The Elevator Contractors of America (ECA) held its annual membership meeting on March 13-15 at the Ritz Carlton Resort in Sarasota, Florida. The program featured an outdoor opening reception, along with a business…
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Jackson recounts the events of the Buildings NY trade show and Co-op & Condo Expo, which took place in New York City in March. The Buildings NY trade show took place on March 30-31 at the Jacob K. Javits Convention Center in New York City. Following the event on April 12 was the NYC Co-op…
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An overview of the European Lift Association’s (ELA) 2011 conference held on April 7 in Italy. The European Lift Association (ELA) held its 2011 conference at the Grand Hotel Vesuvio on the historic waterfront of Naples, Italy, on April 7. The city is historically notable as a vibrant hub city for southern Italy and for…
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Bob Denniston retired from Elevator World, Inc.’s board of directors at the group’s annual meeting in April. Bob Denniston retired from Elevator World, Inc.’s board of directors at the group’s annual meeting in April. He joined the board in 1977 and has served as chairman since 1999. Denniston was born in La Paz, Bolivia, where…
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