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Inventor’s

                                                                          Corner






                                                                             By William Fischer









                     It is our pleasure to bring you the first issue of Inventor’s Corner for the new
                     year. We hope all our readers had a great holiday season, and that the new year
                     is treating you well. As we move toward the spring season, here’s hoping that
                     the spirit of invention brings greater industry to our country, with a spurt of new
                     economic growth and development. We wish you all, a very prosperous 2017.


         Elevator  comprising  traction  sheave  with  specified
         diameter
         Pat. 9,446,931 U.S. class B66B 11/08 Int. class B66B 7/06
         Inventor: Jorma Mustalahti, Hyvinkaa, FI., Esko Aulanko,
         Kerava, FI.
         Assignee: Kone Corporation, Helsinki, FI.
           An elevator may include: an elevator car; a traction
         sheave  that  includes  grooves;  a  hoisting  machine  config-
         ured to drive the traction sheave; and/or hoisting ropes con-
         figured to interact with the traction sheave to move the el-
         evator car. An overall contact between the traction sheave
         and hoisting ropes may exceed a contact angle of 180°. A
         diameter of the traction sheave may be less than 320 mm.
         Each hoisting rope may include steel wires twisted togeth-
         er to form strands. The strands of each hoisting rope may
         be twisted together to form the hoisting rope. A thickness
         of each hoisting rope may be less than 8 mm. An average
         of wire thicknesses of the steel wires may be greater than
         or equal to 0.1 mm and less than or equal to 0.4 mm. A
         strength of the steel wires may be greater than 2,300 N/
            2
         mm  and less than 3,000 N/mm .
                                    2
           Figure 1 is a diagrammatic representation of the structure
         of an elevator. The elevator is preferably an elevator without
         machine room, with a drive machine 6 placed in the elevator
         shaft. The elevator shown in the figure is a traction sheave
         elevator with machine above. The passage of the hoisting
         ropes 3 of the elevator is as follows: One end of the ropes
         is immovably fixed to an anchorage 13 located in the upper
         part of the shaft above the path of a counterweight 2 moving
         along counterweight guide rails 11. From the anchorage, the
         ropes run downward and are passed around diverting pul-
         leys 9 suspending the counterweight, which diverting pul-
         leys  9 are rotatably  mounted on the counterweight  2 and
         from which  the ropes  3 run  further  upward via the rope   Figure 1: Diagram representing a traction sheave elevator.
         grooves of diverting pulley 15 to the traction sheave 7 of the   rope grooves. From the traction sheave 7, the ropes 3 go fur-
         drive machine 6, passing around the traction sheave along   ther downwards via the rope grooves of diverting pulley 15
         rope grooves on the sheave.                         to  the  elevator  car  1  moving  along  the  car  guide  rails  10
           From the traction sheave 7, the ropes 3 run further down-  of the elevator, passing under the car via diverting pulleys
         ward back to diverting pulley 15, passing around it along   4 used to suspend the elevator car on the ropes, and going
         the rope grooves and returning then back up to the traction   then upward again from the elevator car to an anchorage 14
         sheave 7, over which the ropes run in the traction sheave   in the upper part of the elevator shaft, to which anchorage

         48     Wire Rope News & Sling Technology   February 2017
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