A dumbwaiter is a small goods lift or elevator intended to carry objects rather than people. Dams found in modern structures, including commercial, public and private buildings, are often connected between several floors. When installed in restaurants, schools, kindergartens, hospitals, nursing homes or in private homes, elevators usually end up in the kitchen.
The term appears to have been popularized in the United States in the 1840s, after the previous model of "waiting people" is now known as serving a lazy tray and Susans. The mechanical dumbwaiter was created by George W. Cannon, an inventor of New York City. Cannon first applied for a patent brake system (US Patent No. 260776) which could be used for dumbwaiter on January 6, 1883. Cannon subsequently filed a patent on a mechanical dumbwaiter (US Patent No. 361268) on February 17, 1887. Cannon reportedly produced a large number of royalties from patent dumbwaiter until his death in 1897.
Video Dumbwaiter
Description
A simple dumbwaiter is a moving frame on the shaft, dropped by a rope in the pulley, guided by a rail; most dumbunerers have shafts, trains, and smaller capacity than passenger elevators, typically 45 to 450 kg (100 to 992 pounds). Before the electric motor was added in the 1920s, the dumbte controllers were manually controlled with ropes in pulleys.
The early twentieth-century codes sometimes require refractory dumbwaiter walls and flame-retardant doors that close themselves and mention features such as buttons for controlling movement between floors and locking doors that prevent it from opening unless the train stops on that floor. The Dumbwaiter elevator in London is very popular in the homes of the rich and the privileged. The waiter will use it to send the laundry to the laundry room from various rooms in the house. They negate the need to carry a handful of dirty laundry through the house, saving time and preventing injuries.
A legal complaint about the dumbwaiter of a Manhattan restaurant in 1915, which also mentions that food orders are shouted up and down, outlining the operations and limitations as follows:
[There is]... a good game between the dunk-waiter wagon and the walking guides, with the result that the wagon's path is accompanied by a loud noise. The rope that operates the dumb-wait carts runs on wheels with a very shallow groove, so the rope can and sometimes slips off.... The cart does not have a shock absorbers at the top, so when it touches the top of the shaft or wheel there is a harsh report.... [T] he rope strap dumb waiter like a wall at frequent intervals with harsh statements.... [T] Dumb servants are often operated on, running it faster than necessary, and by letting it drop suddenly.
The newer dams can be more sophisticated, using electric motors, automatic control systems, and custom cargo containers of other types of elevators. Newly built book elevators in libraries and letters or other goods transport in office towers may be larger than many residents in public restaurants and private homes, supporting a load of 450 kg (992 pounds).
Maps Dumbwaiter
The rules governing construction and operation
The building codes have governed the construction and operation of dumbunants in parts of North America since the 19th century. Modern dams in the United States and Canada must comply with the American Society of Mechanical Engineers (ASME) code and, therefore, have features similar to passenger elevators. The construction, operation, and use of dumbteer varies greatly by country.
In history
After defection from Soviet underground in 1938, Whittaker Chambers handed him a stack of stolen documents to his nephew, Nathan Levine, who hid him in a restaurant at his mother's house in Brooklyn. A decade later, Chambers asked his nephew to take it (which Chambers called his "life regulator"). Handwritten and typed writing in it comes from Alger Hiss and Harry Dexter White (and known as "Baltimore Document"). The microfilm contained therein is prescribed and harassed (called "Pumpkin Paper" by press) by Richard M Nixon for HUAC.
In culture
Harold Pinter wrote a drama in 1960 entitled The Dumb Waiter , where dumbwaiter forms a key element.
In the 2005 film Zathura: A Space Adventure , Danny used his house hangman to hide from his brother, and then moved home unnoticed by Zorgons.
Gallery
References
External links
- Media related to Food elevators on Wikimedia Commons
Source of the article : Wikipedia
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