Figure 13-18.-Horizontal conveyors.
Roller conveyors with hinged gate actions are
also available for warehouse operations involving
the crossing of thoroughfares. (See figure 13-19.)
If a roller conveyor is used, the cargo should be
moved slowly enough to permit personnel at the
end of the conveyor to handle the boxes. A brake
may be improvised using a belt as shown in figure
The chute (figure 13-21) provides a rapid
means of conveying packages downward. The
principal application is aboard ships where a need
exists to strike down stems.
A warehouse crane is a power-driven, self-
propelled unit consisting of a boom mounted on a
mobile wheeled chassis. The boom can be operated
independently so that sluing and topping can be
accomplished without movement of the chassis.
Power is supplied by a gasoline engine or by
electric motors. Gasoline-powered cranes (figure
13-22) are equipped with pneumatic tires
for outdoor operation. have 180 or 360 degree
sluing booms, and have capacities of 6,000,
10,000, or 20,000 pounds. Electric-powered
Figure 13-19.Roller conveyor hinged gate multiphase warehouse operation.