Vertical Lifts

Vertical lifts are related to elevators. They include freight elevators, dumbwaiters, and ejection lifts.

Design factors for freight elevators include the amount of weight that must be transported per hour, the size of each load, the method of loading, and the distance of travel. The type of load, type of doors, and speed and capacity of cars is also considered.

For low rises below 18 meters (60 ft), hydraulic elevators provide accurately controlled, smooth operation and accurate automatic leveling. Cabs are made of heavy-gauge steel with a multiple-layer wood floor designed for hard service. Ceiling lighting fixtures must have guards against breakage. Freight elevator gates slide up vertically and are at least 1.8 meters (6 ft) high. Hoist-way doors lift vertically or are center opening, and are manually or power operated.

Hydraulic and mechanical vertical lifts are available for warehouse and industrial use. They are open frameworks custom-fit to the application, ranging from simple two-level applications to sophisticated multilevel, multidirectional systems.

Manual load-unload dumbwaiters are used in i( department stores to transport merchandise from stock areas to the selling and pickup centers. Hospitals use dumbwaiters to transport food, drugs, and linens. Restaurants with more than one floor carry food from the kitchen and return soiled dishes in dumbwaiters. Dumbwaiter designs include traction or drum styles.

Automated dumbwaiters (Fig. 49-1) can carry loads of up to 454 kg (1000 lb) at speeds up to 107 meters (350 ft) per minute. The maximum cart size is around 81 cm (32 in.) wide by 173 cm (68 in.) long by 178 cm (70 in.) high.

Automated dumbwaiters are also called ejection lifts. Institutional and other facilities use them for rapid vertical movement of relatively large items. They can deliver food carts, linens, dishes, and bulk-liquid containers, for example. Each load is carried in a cart or basket, which is manually or automatically loaded.

Some dumbwaiters have programmable controllers for automatic loading, dispatching, and ejection. Electronic sensors determine if space is available for a load, and the system automatically returns unloaded carts. Automated dumbwaiters are relatively expensive, and require a large shaft area.

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