Two Attachment Points - Textron Greenlee Ultra Tugger 15000-22 Manual De Instrucciones

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.
Sheave with Two Attachment Points
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
Ultra Tugger
R2
1
θ
2
T
θ
® Cable Puller and Pulling Packages
R1
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