Ultra Tugger
®
Cable Puller and Pulling Packages
Greenlee / A Textron Company
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
19
Cable Pulling Principles
(cont’d)
Typical Resultant Force at Sheave
Cable Pulling Forces
(cont’d)
At the Sheaves
Sheaves are used to change the direction of the pull.
A change in direction creates a new
resultant force
that may be greater than the cable puller’s maximum
pulling force. This new
resultant force
exerts itself on the
sheaves, sheave anchoring system, and support struc-
tures illustrated.
The resultant amount of force depends on the angle of
the change in direction. A brief table is provided here;
For details on calculating the resultant force for any
angle, see IM 1363 (99929988).
Resultant Force Table for the Ultra Tugger
(35.6 kN or 8,000 lb Maximum Pulling Force)
Illustration
Angle of Change
in Direction
Resultant Force
in kN (lb)
180°
0 (0)
150°
18.5 (4160)
135°
27.4 (6160)
120
°
35.6 (8000)
90
°
50.2 (11,300)
60
°
61.6 (13,800)
45
°
65.8 (14,800)
30
°
68.7 (15,400)
0
°
71.2 (16,000)
Resultant Force=
27.4 kN (6160 lb)
135°
