4024, 4036, and 4048 Conveyor Sheaves
Greenlee / A Textron Company
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
7
Hook Load
(cont’d)
Calculating the Hook Load
(cont’d)
Two Attachment Points
To calculate the hook loads exerted at two attachment
points, use the Reference Table and Formulas 1, 2, and 3.
T
R1
R2
T
R1
R2
T
T
Q
ANGLE B
ANGLE B
AN
GLE
A
AN
GLE
A
1
2
Q
1
2
Q
Q
CL
CL
Sheave with Two Attachment Points
Formula 2:
Formula 3:
R
1
= ________________________
R
2
= ________________________
COS A + SIN A / TAN B
COS B + SIN B / TAN A
R
1
= resultant force on left hook, anchoring and support structure
R
2
= resultant force on right hook, anchoring and support structure
A = angle between the left mounting and the centerline of the two legs of the rope
B = angle between the right mounting and the centerline of the two legs of the rope
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
Notes: The total load on the left support structure = R
1
+ the weight of the sheave.
The total load on the right support structure = R
2
+ the weight of the sheave.
R
R
