Page 64 - Wire Rope News & Sling Technology
P. 64

continued from previous page                         provide a sufficient distance between different rope portions
         the elevator of the invention.                       or a sufficient distance between the hoisting ropes and other
           Figure 25 presents a diagram representing another trac-  elevator components.
         tion sheave elevator according to the invention. In this el-  The traction sheave  107 and the hoisting machine  106
         evator,  the  ropes  go  upward  from  the  machine.  This  type   are preferably disposed somewhat aside from the path of
         of elevator is generally a traction sheave elevator with ma-  the elevator car  101 as well  as that of the counterweight
         chine  below. The elevator car  101 and the counterweight   102, so they can easily be placed almost at any height in the
         102 are suspended on the hoisting ropes 103 of the elevator.   elevator shaft below the diverting pulleys 104 and 105. If
         The elevator drive machine 106 is mounted in the elevator
         shaft, preferably in the lower part of the shaft, and the hoist-
         ing ropes are passed via diverting pulleys 104, 105 provided
         in the upper part of the elevator shaft to the car 101 and to
         the counterweight 102. The diverting pulleys 104, 105 are
         placed in the upper part of the shaft and preferably sepa-
         rately mounted with bearings on the same axle so that they
         can rotate independently of each other. The hoisting ropes
         103 consist of at least three parallel ropes.
           In figure 25, the hoisting ropes run as follows: One end of
         the ropes is fixed to an anchorage 112 in the upper part of
         the shaft, from where it goes downward to the counterweight
         102. The counterweight is suspended on the ropes 103 via

                                                              Figure 26: Steel wire rope used in the elevator.

                                                              the machine is not placed directly above or below the coun-
                                                              terweight or elevator car, this will allow a saving in shaft
                                                              height.  In  this  case,  the  minimum height  of  the  elevator
                                                              shaft is exclusively determined on the basis of the length
                                                              of the paths of the counterweight and elevator car and the
                                                              safety clearances  needed above and below these.  In addi-
                                                              tion, a smaller space at the top or bottom of the shaft will
                                                              be  sufficient  due  to  the  reduced  rope  pulley  diameters  as
                                                              compared with earlier solutions, depending on how the rope
                                                              pulleys are mounted on the elevator car and/or on the frame
                                                              of the elevator car. Sometimes it may be advantageous to
                                                              make  all  or  some  of  the  diverting  pulleys  larger  than  the
                                                              traction sheave. Among these larger diverting pulleys may
                                                              be especially those mounted in the upper part of the shaft.
                                                              For example, in the case of 4:1 suspension, a more spacious
                                                              rope passage arrangement will be achieved by using some-
                                                              what larger diverting pulleys in the upper part of the shaft.
                                                              Of course, this also applies to elevators with machine above,

         Figure 25: Diagram representing another traction sheave elevator.

         a diverting pulley 109. From the counterweight, the ropes
         go further upward to a first diverting pulley 105 mounted
         on an elevator guide rail 110, and from the diverting pulley
         105 further to the traction sheave 107 driven by the drive
         machine 106. From the traction sheave, the ropes go again
         upward to a second diverting pulley 104, passing around it,
         after which they pass via diverting pulleys 108 mounted on
         top of the elevator car and then go further to an anchorage
         113 in the upper part of the elevator shaft, where the other
         end of the hoisting ropes is fixed. The elevator car is sus-
         pended on the hoisting ropes 103 by means of diverting pul-
         leys 108. In the hoisting ropes 103, one or more of the rope
         portions  between  the  diverting pulleys  or  between  the  di-
         verting pulleys and the traction sheave may deviate from an
         exact vertical direction, a circumstance that makes it easy to   Figure 27: Another steel wire rope used in the elevator.

         64     Wire Rope News & Sling Technology   April 2017
   59   60   61   62   63   64   65   66   67   68   69