Hook Load - Greenlee 639 Instruction Manual

Hook Load

Two variables interact with the sheave to produce a
resultant (total) force, or hook load. This load, repre-
sented by R in the formulas and illustrations, is exerted
on the hook, anchoring, and structural support.
T
R = the resultant force, or hook load; this force is
exerted on the hook, anchoring, and structural
support
θ = the angle of change in rope direction
T = the tension exerted on the rope by the cable
puller
Sheave Forces
Greenlee Tools, Inc.
R
T
Reference Table
Illustration
R = 0
T
R = 1.41 x T
T
R = 2 x T
T T
4
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Hook Sheaves
θ
180°
T
150° 0.52 x T
135° 0.77 x T
120° 1 x T
90° 1.41 x T
T
60° 1.73 x T
45° 1.85 x T
30° 1.93 x T
0° 2 x T
R
0