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         of each of the first and second roller end parts is less than
         the diameter of the wire rope. Taper angles of the first and
         second roller end parts are different from each other.
           The pipelayer 1 includes a vehicle main body 2, a counter-
         weight 3, a boom 4, a hook 5 and a winch unit 6. It should
         be noted that a wire rope 83 for the hook 5 (to be described)









                                                              Figure 18: Plan view of the pipelayer.
                                                              B; a rightward direction is depicted with an arrow R; and a
                                                              leftward direction is depicted with an arrow L.
                                                               The vehicle main body  2 includes an engine compart-
                                                              ment 11, the cab 10, a pair of drive units 13 and 14 and
                                                              so forth. An engine is disposed in the engine compartment
                                                              11. The cab 10 and devices such as a hydraulic pump (not
                                                              illustrated in  the  drawings) are  disposed rearwards of
                                                              the  engine  compartment  11.  The  drive  unit  13  includes
                                                              a  crawler  belt  13a,  whereas  the  drive  unit  14  includes
                                                              a crawler belt 14a. When the crawler belts 13a and 14a
                                                              are driven by means of the driving force from the engine,
                                                              the pipelayer 1 is caused to travel. The width directional
                                                              length of the vehicle main body 2 is less than the back-
                                                              and-forth directional length thereof.



         Figure 16: External view of a pipelayer.
         and a wire rope 73 for the boom 4 are not illustrated in fig-
         ure 16 for easy understanding of the drawing. Further, in
         the following explanation, a back-and-forth direction means
         the back-and-forth direction of the vehicle body seen from an
         operator seated in a cab 10. On the other hand, a right-and-
         left direction or a lateral direction means the vehicle width
         direction of the pipelayer 1 and corresponds to the right-and-
         left direction seen from the operator seated in the cab 10.
         Yet further, in figure 16, a forward direction is depicted with
         an arrow F; a backward direction is depicted with an arrow


















                                                              Figure 19: Front view of the pipelayer.

                                                               The counterweight 3 is attached to the right lateral surface
                                                              side of the vehicle main body 2. Figure 17 is a front view illus-
                                                              trating a condition that the pipelayer 1 is performing a work
                                                              of laying a pipe 99. The counterweight 3 is attached to the
                                                              vehicle main body 2 through an arm member 15. The counter-
                                                              weight 3 is mounted while being movable in the vehicle width
         Figure 17: Front view of a condition that the pipelayer is performing   direction by means of hydraulic cylinders 16. In a lifting work
         a pipe laying work.

         60     Wire Rope News & Sling Technology   June 2017
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