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HANDBOOK OF MECHANICAL DESIGN 



Fig. 160.— Sheet- 

 metal ball-socket 

 housing with cover 

 fastened by spot 

 Avelding. 



Fig. 161.— The flattened 

 sphere is held by the center 

 stud. Felt seals are used to 

 retain the grease. 



Fig. 162. — Combina- 

 tion pivot joint and 

 end-thrust bearing, the 

 ball being retained by 

 the washer spun over 

 the fixed screw. 



Fig. 163. — Universal 

 joint, the smaller pin 

 being retained by wire 

 snap ring. 



Fig. 164, — Rocker-arm bearing 

 as used on an airplane. 



Fig, 165. — Arm joint of a 

 pantograph machine, with cen- 

 ter stud clamped without end 

 play, stud head and bushing 

 end forming the ball race. 



Fig. 166. — Arm joint designed 

 for accuracy. Upper ball bear- 

 ing takes all thrust caused by 

 weight, and the spindle is pinned 

 to the stationary member. The 

 bearing has a light press fit. 



