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Chapter 13 Materials Handling Equipment
Storekeeper 3 & 2 - Manual for watching over inventory and other things needed in a store
Hand Pallet Truck
TRACTOR-TRAILER TRAINS The tractor-trailer train (figure 13-2) is a system of hauling   with   a   self-propelled   motor   power   unit connected   to   a   series   of   individual   load-carrying trailers. Different types of tractors and trailers are used. Tractor-trailer   trains   can   haul   larger   loads   than carrier-type trucks of equal horsepower capacity. They can be operated in trains up to the total drawbar pull of the tractor. The number of trailers one tractor can keep in operation depends upon conditions such as length of haul, nature of material, and weight of the load on each trailer. Under normal conditions, one tractor should be able to keep one set of hailers loading, a second set underway, and a third set unloading. Tractor-trailer trains may be effectively used on hauls between 400 feet and  1  mile  in  length.  A  carrier-type  truck  is  normally used for hauls greater than 1 mile. WAREHOUSE TRACTORS A   warehouse   tractor   is   an   electric-or gasoline-powered vehicle designed to pull a train of warehouse trailers. The gasoline-powered models most used in the Navy are equipped with pneumatic tires and have  rated  drawbar  pulls  of  2,600,  4,000,  or  7,500 pounds. Electric-powered models are equipped with solid rubber tires and have rated drawbar pulls of 2,000 or 4,000 pounds. Drawbar pull, the force that the tractor can exert in pushing or pulling loads, is merely a means of  indicating  tractor  capability.  The  actual  capacity  of the tractor is normally far in excess of the drawbar pull rating.  A  tractor  with  a  drawbar  pull  of  2,600  pounds Figure 13-2.—Tractor-trailer train may, for example, have an actual towing capacity of 50 tons. These are five different models of tractors that are standard  for  the  military  services. WAREHOUSE TRAILERS A warehouse trailer is a load-carrying platform mounted on casters or wheels. Standard trailers are available in a wide variety of sizes and capacities. Some are equipped with solid rubber or pneumatic tires. The caster-steering type has fixed rear wheels that carry about  two-thirds  of  the  load,  and  caster  wheels  at  the front  through  which  steering  is  accomplished.  The caster-steering type of trailer is produced in 4,000 and 6,000-pound  capacities. HAND TRUCKS Handtrucks may be constructed of wood or metal. They are used in phases that mechanical equipment cannot be operated because of space limitations, The four-wheel platform handtruck (figure 13-3) may be used to advantage in breaking out retail issues for  bins,  carrying  light  loads,  or  for  any  operation involving short hauls with frequent stops. It may also be used in multistory warehouses and for small-lot stockpicking. The truck may be equipped with solid rubber tires or steel wheels. The  two-wheel  handtruck  (figure  13-4)  consists  of two handles a platform on which the load rests, and wheels attached to the bottom of the framework. A blade  extends  at  an  angle  from  the  bottom  of  the platform  to  hold  the  bad. A stockpicker truck (figure 13-5) is a handtruck used  for  picking  stock  from  shelves  when  filling  orders. The Storekeeper pushes the truck in the aisles between the  shelves  to  carry  small  issues  in  cardboard containers,  paper  envelopes,  or  tote  boxes.  Some Figure 13-3.—Handtruck, four-wheel. 13-2

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