Page 61 - Wire Rope News & Sling Technology - December 2019
P. 61

INVENTOR’S CORNER
           The upper slewing body  92 is pro-
         vided with a slewing frame 93 which is
         mounted  on  the  lower  travelling  body
         91 so as to be able to slew around a ver-
         tical axis, a boom 94 attached to a front
         part of the slewing frame 93 so as to be
         able to rise, and a hooking device  95
         which is hung from a tip of the boom 94
         via a wire rope W (a work rope) which is
         a hoisting rope. The hooking device 95
         functions as an operation unit for hoist-
         ing work. Figure 6 illustrates a state
         where a hoisted load 96 is hung by the
         hooking device  95 connected with the
         wire rope W. The hooking device 95 and
         the hoisted load 96 hung therefrom are
         an object 97 to be wound up or down by
         the electrically driven winch device 1.
           The electrically driven winch device
         1 is mounted on the upper slewing body
         92.  A position where  the electrically
         driven  winch  device  1  is  disposed is
         behind an attachment site of the boom
         94 at the slewing frame 93. The electri-
         cally driven winch device 1 is a winch
         device for winding up, which winds or
         unwinds  the wire rope W connected
         with the hooking device  95 so as to
         cause the hooking device 95 to perform
         elevating operation for hoisting work.
         The electrically  driven winch  device
         1 of this embodiment is characterized
         in that a plurality of axial-gap electric
         motors are used as a driving source for
         the elevating operation.
           Figure 7 is a plan view illustrating a
         schematic structure of the electrically                  Dave Frieder:
         driven winch device 1, and figure 8 is
         a perspective view thereof. The electri-      The Magnificent Bridges
         cally driven winch device 1 is provided
         with a winch drum 2, a driving source
         3 having a first electric motor 3A and               of New York City
         a second electric motor 3B (a plurality
         of electric motors) of axial-gap type, a
         drive shaft 4 common to the electric mo-  “New York’s Bridges, As You’ve Never Seen Them Before!”
         tors 3A, 3B, a brake 51 to be attached
         to the drive shaft  4, and a reduction
         gear  52 to be interposed between the
         drive shaft 4 and the winch drum 2.
           Figure 9 is a plan view illustrating a
         schematic structure of an electrically
         driven winch device  1A according to
         another embodiment. The electrically
         driven winch device  1A is an embodi-
         ment which can realize so-called free
         fall operation  and  is further  provided
         with a clutch 53 in addition to the struc-
         ture illustrated in figure 7. The clutch
         53 is interposed between the drive shaft
         4 and the winch drum 2 as with the re-
         duction gear 52. The following descrip-
         tion  will  explain  each  structure  in  de-
         tail. The winch drum 2 is provided with                 Available on Amazon.com
         a cylindrical drum part 21 on which a        or directly from his website: www.davefrieder.com
         wire rope W is to be wound, and a flange
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