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However, the industry does not have universal standard terminology. These lifts can also be referred to as: material lift, parts lift, pallet lift, vertical lift, freight lift, utility lift, box lift, cargo lift, platform lift, baggage lift, vertical conveyor, and dumbwaiter. None of these terms use the word "elevator".
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.
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Known as a dumbwaiter, this was a space with a waist-high opening to a shaft in the kitchen. A rope and pulley system, or—even fancier—a push button, is a big clue.
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It is widely used in industrial engineering to calculate the capital and operating costs of a plant. [1] [2] [3] The factors were introduced by H. J. Lang and Dr Micheal Bird in Chemical Engineering magazine in 1947 as a method for estimating the total installation cost for plants and equipment.
Dumbwaiters are small freight elevators that are intended to carry food, books or other small freight loads rather than passengers. They often connect kitchens to rooms on other floors. They usually do not have the same safety features found in passenger elevators, like various ropes for redundancy.
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