Figure 13-20.-Brake on a roller conveyor.
Figure 13-22. Warehouse crane, gasoline-powered.
cranes are equipped with solid robber tires for indoor
operations. They have 270 degree sluing booms and
have a capacity of 6,000 or 10,000 pounds.
The mobile crane consists of a boom mounted on a
truck chassis and has characteristics similar to that of a
warehouse crane. However, the mobile crane has a
greater topping distance and is, therefore, used in a wide
range of operations.
The gantry crane is a hoisting unit mounted on a
gantry (any frame or structure spanning or bridging an
intervening space). Gantries may be arched, bridged,
full, or half.
The unit shown m figure 13-23 is an adaptation of
the overhead type of crane applied to outdoor service
where no permanent elevated structure exists on which
Figure 13-21.-Stores strike-down chute.