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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.
The bucket elevator is the enabling technology that permitted the construction of grain elevators. A diverter at the top of the elevator allows the grain to be sent to the chosen bin. A similar device with flat steps is occasionally used as an elevator for humans, e.g. for employees in parking garages.
A paternoster in Prague Paternoster elevator in The Hague, when it was still in operation. A paternoster (/ ˌ p eɪ t ər ˈ n ɒ s t ər /, / ˌ p ɑː-/, or / ˌ p æ-/) or paternoster lift is a passenger elevator which consists of a chain of open compartments (each usually designed for two people) that move slowly in a loop up and down inside a building without stopping.
Taco Bell is kicking off summer with a redesigned drive-thru plucked right out of an episode of "The Jetsons." On Tuesday, the Mexican-inspired fast-food chain announced that its newest high-tech ...
Holeless hydraulic elevators were developed in the 1970s, and use a pair of above-ground cylinders, which makes it practical for environmentally or cost-sensitive buildings with two, three, or four floors. Roped hydraulic elevators use both above-ground cylinders and a rope system, allowing the elevator to travel further than the piston has to ...
The Olds elevator is a variant of a screw conveyor developed by Australian engineer Peter Olds in 2002. [ 7 ] [ 8 ] Rather than rotate a central screw blade, a stationary screw is contained within a rotating casing that scoops surrounding material into its base. [ 9 ]