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A simple dumbwaiter is a movable frame in a shaft, dropped by a rope on a pulley, guided by rails; most dumbwaiters have a shaft, cart, and capacity smaller than those of passenger elevators, usually 45 to 450 kg (100 to 992 lbs.) [2] Before electric motors were added in the 1920s, dumbwaiters were controlled manually by ropes on pulleys. [1]
George W. Cannon was an American inventor from New York.He is best known for the invention of the mechanical dumbwaiter.Cannon first filed for the patent of a brake system (US Patent no. 260776) that could be used for a dumbwaiter on January 6, 1883. [1]
Jefferson never had a lazy Susan at Monticello, but he did construct a box-shaped rotating book stand and, as part of serving "in the French style", employed a revolving dining-room door whose reverse side supported a number of shelves. [9]). By the 1840s, Americans were applying the term to small lifts carrying food between floors as well. [1]
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
The company produced its first portable steam engine in 1876, which is now on display at the Smithsonian Institution. [5] In 1957 Case made the 320 Construction King backhoe loader. [6] Since 1969 Case has manufactured skid steers, starting in Burlington, Iowa and later moving production to Wichita. [7]
The product name Clark Michigan was abbreviated to Michigan and the three brand names Volvo BM, Michigan, and Euclid were incorporated into the new company VME Group. In 1995, VME became a fully owned Volvo company and changed its name to Volvo Construction Equipment. In 1998, Volvo CE became the first foreign company to invest in Korea. The ...
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The Construction History Society (not to be confused with the Construction History Society of America) is a learned society that promotes the international study of the history of construction. [ 1 ] [ 2 ] Though based in Britain, it is interested in the history of construction of all countries and particularly how those histories inter-relate.