- Project Runeberg -  Machinists' and Draftsmen's Handbook /
323

(1910) Author: Peder Lobben - Tema: Mechanical Engineering
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CRANE HOOKS. 323
CRANE HOOKS.
Fig. 3.
Crane hooks, as shown in Figs. 1, 2 and 3. may be designed
by the following formulas :
P=B2 D^s/’F
P = Load in tons.
D = Diameter of iron in inches.
e=±y
2 D f=2B g=l%D
i —\% D j=7/zD t=%D
i = y
A D m = iy
2 D k = iy
s L>
S = Standard screw of diameter r n
at the bottom of the thread.
When a rectangular iron plate is substituted
for a washer, the bearing surface of the plate
against the wood should at least be equal to
the area of the washer, calculated by the above
formula.
Chain Links.
(See Figure 4.)
D = Diameter of iron.
L = 4y
2 to 5 D.
B = sy
2 n.
(For strength of chains, see page 222).

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