. Design of a portable pneumatic riveter. # 4. 7• 2 205 295 58 78 3 4 5 6 7 8 9 -26- Substituting the proper values in (2) to (8) inclusive wehave the following values. These values do not exceed the spec-ified limit. st
. Design of a portable pneumatic riveter. # 4. 7• 2 205 295 58 78 3 4 5 6 7 8 9 -26- Substituting the proper values in (2) to (8) inclusive wehave the following values. These values do not exceed the spec-ified limit. st = 694°Q X0-°-- = ^580 sq. in. Sc x = 4450 sq. in. = 69400 = 8840 lb</ B ln-8 Max. St = 13410 sq. in. Max. S„ = 11350 sq. Max. S8 = 9640 sq. find the stress at the point 0, see Fig. 9 page 24, mo-ments were taken about the point 0. M = 3510 x = 21620 lb. in. Assuming a section as shown below in Fig. 11 and investigating the section we get the values shown in Table ?FT - 7 v//////////////-a S£CT/OW/\A Fig. 11. -27- TABLE VI. Mom. c No Area Mom. Ct -Cc leg h Ah-^ I Tc C 1 1 1 9 : 2 » 5 • 5 6 .65 • 1 • 1 6 Substituting the values given in Table VI in (14) we have sc = St = 2q6|^ = 2360 sq. in. Ss = 21620 = 2250 sq. in. These values are low but a wide section must be used onaccount of clearances. The toggle lever arms will be considered as cantileverbeams uniformly loaded. Hence substituting the known values ofP and 1 in (15) we have for the maximum bending moment at thepoint of support M = 34700 x = 13000 lb. in. Substituting the known values of M, and d in (14) we have o _ 32 x 13000 _ / , S ~ - 4920 sq. in. which is a safe value to use. TOGGLE BOLT. The toggle bolt will be considered as a beam fixed a: bothends and carrying two concentrated loads as shown in Fig. 12. -28- r
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
