Wire Ropes Under Bending and Tensile Stresses - Wire Ropes: Tension, Endurance, Reliability - page 316

Fig. 3.85 Hanging
sheaveHanging sheave

S = S 1 S 2

Q

Fig. 3.86 Tackle block

S = S 1

S 2 S 3 S 4 S 5 S 6

Q

For S = Si and S 2 = S g the efficiency for the hanging sheave is

g h ¼ 1 þ g

: ð 3 : 108 Þ

2

3.5.2.3 Tackle Block

The forces in a tackle block—as seen in Fig. 3.86 —are

S 1 ¼ S
S 2 ¼ g S

S 3 ¼ g 2 S
S z ¼ g z 1

S :