America is infused with the concept of dumbwaiters at home. These are vertically movable trolleys that help in carrying loads from one floor of a duplex to another floor. These are electrically mobilized and attempt to make the scope of carriage easier between distant floors. The idea is to shy away from carrying human loads. In this regard, they are to be treated in a different light than elevator. Their capacity to bear load is a lot less. More generally, they are good enough to take up some 100 pounds of load.
The dumbwaiter is an ideal instrument for duplexes. It helps in connecting the floors so that easy object navigation between them is made possible. In the absence of such technology, it becomes really stressful to carry something all the way to a different floor. Dumbwaiters use an electric motor and intertwined wire cabinet to operate.