Page 58 - Wire Rope News & Sling Technology

 

 

 

 

 

Page 58 - Wire Rope News & Sling Technology
P. 58

continued from previous page                         through a boom-raising/lowering wire rope 32 and a boom
         than the assembling and disassembling of the lower propel-  guy line 33. The boom-raising/lowering wire rope 32 is un-
         ling body 10 (e.g., during transportation of the lower propel-  reeled  from  a  boom-raising/lowering winch 34 attached to
         ling body 10), the body lifter 15 is retracted along front and   the back surface of the mast 30, and wound between a plu-
         rear side surfaces of the car body 12.               rality of mast-side sheaves 35 aligned in a rightward-left-
           The upper slewing body 20, as shown in figure 1, is sup-  ward direction near the mast top 30t and a plurality of guy
         ported on the lower propelling body 10 through a slewing   line-side sheaves 36 connected to a rear end of the guy line
         bearing  19  so  as  to  be  able to  be  slewed  relatively  to  the   33  and arranged in  the  rightward-leftward direction.  The
         lower propelling body 10. The upper slewing body 20 has a   boom-raising/lowering winch 34 is operable to reel or unreel
                                                              the boom-raising/lowering wire rope 32 while the mast 30 is
                                                              fixed, thus raising/lowering the boom 25.
                                                               The  mast  30  is  raised  and  lowered  pivotably  in  accor-
                                                              dance with a vertical swinging movement thereof about
                                                              the mast foot  30f.  Specifically,  the  mast  top  30t and the
                                                              distal end of the crane mast 27 are interconnected through
                                                              a mast guy line 31, and the mast-raising/lowering winch is
                                                              operable to reel or unreel the mast raising/lowering rope 28
                                                              to raise and lower the crane mast 27, thereby raising and
                                                              lowering the mast 30.
                                                               The counterweight support members 41, which are so dis-
                                                              posed as to extend in the frontward-rearward direction and
                                                              be aligned in side-by-side relation in the rightward-leftward
                                                              direction as shown in figure 4, are adapted to be extended/
                                                              retracted so as to forcibly change a hanging radius R of the
                                                              counterweight  50, i.e.,  a horizontal distance between the
                                                              mast foot 30f and a center of gravity (gravitational center)
                                                              of the counterweight 50. Each of the counterweight support
         Figure 4: Enlarged view of a counterweight.          members 41 has a front end attached to the rear end of the
                                                              upper slewing body 20 and a rear end connected to the coun-
         rear end portion to which the upper slewing body-rear end   terweight 50.
         counterweight 22 are attached, a front end portion to which
         the boom 25 is attached, and a portion to which the mast 30   Automated system for load acquisition and engagement
         is attached at the rear of the boom 25. Furthermore, there   Pat. 8,643,850, U.S. class 356/614, Int. class G01B 11/14
         is attached a crane mast 27 to the upper slewing body 20   Inventor: Richard L. Hartman, Huntsville, AL., Stephen R.
         at a position below and rearward of the mast 30. Besides,   Granade, Madison, AL., Joel Hannah, Somerville, AL., Ar-
         mounted to the upper slewing body 20 are an operator cabin   thur B. Caneer, Huntsville, AL.
         21 and non-illustrated components, such as a engine, a hy-  Asignee: Richard L. Hartman, Huntsville, AL., Stephen R.
         draulic pump and a hydraulic line.                   Granade, Madison, AL., Joel Hannah, Somerville, AL., Ar-
           The upper slewing  body-rear end counterweight  22 are   thur B. Caneer, Huntsville, AL.
         ones for preventing the mobile crane 1 from being inclined   A method for automatically guiding a lifting device on a
         frontwardly due to a load hung by a hook 26 to thereby en-  lifting apparatus to a lifting point on a load is disclosed. A
         large a lifting capacity of the mobile crane 1. The upper slew-  beacon is associated with the lifting point on the load has a
         ing body-rear end counterweights 22 in this embodiment are   plurality of lights arranged in a predetermined pattern. A
         fixed to right and left side surfaces of the rear end of the up-  sensor on the lifting apparatus detects the lights and pro-
         per slewing body 20 respectively, as shown in figure 4. The   vides signals to a processor. The processor calculates loca-
         upper slewing body-rear end counterweights 22 are provided   tion of the lifting point, and develops signals that directs the
         separately from the counterweight 50 disposed rearward of   lifting apparatus, or an operator of the lifting apparatus, to
         the upper slewing body 20.                           engage the lifting point with a lifter on the lifting apparatus.
           The boom 25 is formed in a lattice structure, and attached   The load may then be lifted and moved.
         to the front end of the upper slewing body 20 as shown in   Figure 5 illustrates one embodiment of the present inven-
         figure  1  so  as  to  be  derrickable  with  respect  to  the  upper   tion. In this embodiment, there is a helicopter (illustrated),
         slewing body 20. The boom 25 has a distal end formed as a   a crane, forklift or any other lifting device 10 having a sen-
         boom top 25t, from which the hook 26 is suspended to hang a
         load through a wire rope. The crane mast 27 is a member for
         raising/lowering the mast 30, having a hollow rectangular
         cross-section. The crane mast 27 has a basal end attached
         to the upper slewing body 20 and a distal end located on an
         opposite side of the basal end, the distal end connected to a
         drum of a mast-raising/lowering winch (not shown) mounted
         on the upper slewing body 20 at a position near the rear end
         thereof, through a mast raising/lowering rope 28.
           The mast 30 has a basal end serving as a mast foot 30f
         vertically pivotably attached to a portion near the front end
         of  the  upper slewing  body  20  and a distal end  located on
         an opposite side of the base end and formed as a mast top
         30t, the mast top 30t and the boom top 25t interconnected   Figure 5: Overall schematic view of automated system.

         58     Wire Rope News & Sling Technology   June 2018
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