188 



HANDBOOK OF MECHANICAL DESIGN 



SAFETY GEARS 



64 



9 springs 

 outside diame+er 



0. 109 "diam. wire 

 Load= 1100 lb. per in. travel per turn 

 Test = load 35 to 40 lb. on 20 in. radius lever 

 Fig. 350. 



M" 

 32 



2 spn'ngs 

 outside diameter 



25ieeih ^pHch 

 for roller chain 



H 



0.040"diam. wire 

 Load = 26 lb. per in. travel per turn^ for noise maker only 

 Test= load 25to281b.ona 57in. radius lever 

 Fig. 351. 



341-8 P 



6 springs 

 g2. outside diam, 



0.109 diam. wire 

 Load= 1,100 lb per 

 in. travel per turn 

 Test = load 60 to 65 

 lb. on 20 in. radius 

 lever 



10 springs 

 outside diam. 



0.080"diam wire 

 Load= 259 lb per 

 in. travel per turn 

 Test= load 56 lb 

 on 18 in. radius 

 ever 



Fig. 352. 



Fig. 353. 



