LATCHES, LOCKS, AND FASTENINGS 



101 



Fig. 78. — Another form, in 

 which the grooves are cut all 

 around the rod, which is then 

 free to turn to any position. 



Fig. 82. — Instead of a 

 ball, a hollow plunger is 

 used which accommo- 

 dates the spring. The 

 end is hemispherical. 



A B 



Fig. 83. — At A is shown the usual 120-deg. 

 conical spot made with a drill. At B is shown a 

 90-deg. spot which gives a more positive seat, 

 one which will not permit the plunger to disen- 

 gage as readily and which is preferable when 

 considerable vibration is encountered. 



Fig. 79. Fig. 80. 



Figs. 79 and 80. — A double-locking 

 device for gear-shift j'oke rods is 

 shown in Fig. 79. At A, the neutral 

 position is shown with ball X free in 

 the hole. At B, the lower rod is 

 shifted; ball X is forced upward, the 

 upper rod being retained in a neutral 

 position. The lower rod must also 

 be in neutral position before the upper 

 rod can be moved. A similar design 

 is shown in Fig. 80, wherein a rod with 

 hemispherical ends is used in place of 

 ball X. 



Fig. 84. — The plunger is 

 turned down slightly smaller 

 than the inside diameter of the 

 spring which gets its other bear- 

 ing against the threaded plug, 

 the hole in the plug guiding the 

 stem of the plunger. 



Fig. 85. — Instead of a hole, 

 a slot is milled across the rod. 

 Since the plunger is conical, it 

 is obvious that only line con- 

 tact is obtained. 



Fig. 81. — Without using a spring of any 

 kind, three gear-shifting rods are locked by a 

 large steel ball. At A, the neutral position 

 is shown. At B, the lower rod has been 

 shifted, forcing the ball upward, thereby 

 locking the other two rods. The dashed 

 circle shows the position of the ball when 

 the right-hand rod has been shifted. 



Fig. 86. — The spring tension may be increased 

 or decreased as desired by the long hollow threaded 

 plug, which is then locked in position b^- means of 

 the check nut. In this design, the rod is flattened 

 and the locating holes, which are truncated cones 

 in shape, are machined into the flat surface. 



