LATCHES, LOCKS, AND FASTENINGS 



113 



Spn'nq-bocked bolf 



A^ ^^ 



Hand-opera ied 

 / re/ease cam 



^Engaging lug held 

 in correal relation 

 Y/xro' '^y ^° cam by sehcrew 

 V//V///, which engages key- 

 way in boll 



Fig. 200. 



.' ^B 



^Locking ring (a) 

 ^^^^a< — Locking ring (b) 



Each locking ring 

 has series of five 

 projeciions or bolls 

 which engage one • 

 anolher Each boll 

 and space mach- 

 ined accurately 

 lo occupy J6 deg. 

 of circle 



Fig. 201. 



Taper pin 



Side wa//s of grooves LJ ~V/ Taper pin - 

 in lock- boll plales are hardened, 



Section X~X 



'Lever fhaf ocfuafes lock boll 

 Fig. 202. 



q- ^ Hardened and 

 ground cylind- 

 rical lock boll 



Roller'^ 



*— E 



Fig. 203. — Plates A and C are fastened 

 together, the former accommodatmg the bolt B, 

 whereas plate C is positioned by bolt D. 

 Rotated in direction of arrow, bolt S slides into 

 slot in plate A, one side being milled to 20 deg. 

 When indexing begins and bolt D is pulled away, 

 45-deg. slot in plate A pushes out the bolt .8, 

 both bolts then riding on periphery of respective 

 plates, and bolt D sliding down the easy incline F 

 to a predetermined depth. 



/ Plate ~ 



Tension spring 



Lever arm 



'Lever 



Ear 



Pivot shaft-' 



Fig. 204. — Bolt integral with lever arm has ears directly 

 above the pivot shaft fitting on either side of the plate. As the 

 plate reciprocates, it pulls the bolt along with it. Cam contacts 

 roller, the cam being long enough at A' to accommodate the 

 required travel of plate and bolt. The welded ring fits in groove 

 in hub of plate and is connected to tension spring, the other end 

 of which engages a pin in lever. 



