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Page Title: Crane
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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 13-20. Chutes 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. CRANE 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. 13-9

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