ELEVATOR
ROPE
CONSTRUCTIONS
Wire ropes used in elevators (the term
"lift"
is used internationally) are
designed and manufactured specifically for that application and are not
inter-
changeable with standard wire ropes. The most common elevator rope construc-
tions are shown in Figure 11. Many factors determine selection
of
a rope con-
struction to perform one
of
the functions in the elevator system. It is best to fol-
low the recommendation
of
the elevator manufacturer when replacing rope. In
fact, replacement
of
ropes must conform to rules specified in ASME A 17, Safety
Code for Elevators and Escalators.
Almost all rope furnished for elevator service contains a core developed
specifically for this application. Rope with an independent wire rope core
(IWRC) is used in some applications.
Elevator rope
is
furnished primarily in right regular lay and right lang lay.
GRADES
Elevator rope is produced in three basic grades:
Traction the most common grade
of
elevator rope, is primarily used
for hoist ropes which require a blend
of
ductility and strength.
Extra High Strength Traction -primarily used where high speed or
great height require a higher nominal breaking strength hoist rope.
It
may also
perform better in more abrasive undercut-U and V-type groove applications.
Iron - primarily used for elevator applications other than hoist rope.
For information on minimum breaking force see Tables
41
and 42.
As noted, it is beyond the scope
of
this publication to discuss design and selec-
tion considerations for elevator rope. Information concerning sheave diameters,
design factors (ratio
of
minimum breaking force to working load), groove con-
tours, socketing and inspection, can be found in the ASME
AI7
code.
6 x
25
Filler Wire
FC
Figure
11
8 x
19
Seale
FC
Common Elevator Rope Constructions
20 • Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
8 x
21
Filler Wire
FC
8 x
25
Filler
Wire
FC
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