. The Bell System technical journal . 0 123456789 10BFig. (b)—Tension spring package design curve. Equations () and (). Fig. —Tension spring package design curve. Equation (). 380 DYNAMICS OF PACKAGE CUSHIONING 581 As an example of the calculations, Table I contains the entries for thedesign of springs for a 21 pound article (including \ the estimated springweight) which is to be packaged so as not to exceed 35g in a five-foot drop, TABLE I Computation Form for Tension Spring Packages 1. W2 (lbs.) 21 2. // (ins.) 60 ?>. G„, 35 4. xo (ins.) 5 5. I (ins.) :

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. The Bell System technical journal . 0 123456789 10BFig. (b)—Tension spring package design curve. Equations () and (). Fig. —Tension spring package design curve. Equation (). 380 DYNAMICS OF PACKAGE CUSHIONING 581 As an example of the calculations, Table I contains the entries for thedesign of springs for a 21 pound article (including \ the estimated springweight) which is to be packaged so as not to exceed 35g in a five-foot drop, TABLE I Computation Form for Tension Spring Packages 1. W2 (lbs.) 21 2. // (ins.) 60 ?>. G„, 35 4. xo (ins.) 5 5. I (ins.) : 6. 6 0 7. Calc. xq/( 8. Find Vc from Fig. 9. Calc. h/y/c (G,n = L 10. Find N from Fig. 11. Calc. W^CnyiliN = K (lbs/in.) 12. = (K/Wo^i () 13. Find k/K from Fig. 14. Calc. k = K ■ k/K (lbs/in.) 15. Calc. B = IWih/Kcf 16. Find d,„/Vc I from Fig. 17. Calc. djC = Vc • d,n/y/a 18. Calc. d,n = t ■ djt (ins.) 19. Calc. dm/t + xo/t 20. Find efC from Fig. and line 6 21. ^™ = ^ • e/^ • ^(Ibs)

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1