Two Attachment Points - Textron GREENLEE Ultra Tugger 6800-22 Manual De Operación

Cable Pulling Principles (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.
R1
T
Formula 2:
R
R = ________________________
1
COS A + SIN A / TAN B
R = resultant force on left hook, anchoring and support structure
1
R = resultant force on right hook, anchoring and support structure
2
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
The total load on the right support structure = R
Greenlee / A Textron Company
6800-22 Ultra Tugger
R2
1
θ
2
T
θ
Sheave with Two Attachment Points
Cable Puller and Pulling Package
®
R1
A = Angle A
B = Angle B
T
Formula 3:
R
R = ________________________
2
COS B + SIN B / TAN A
+ the weight of the sheave.
1
+ the weight of the sheave.
2
21
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R2
1
θ
2
T
θ