HYDRAULIC RIVETERS 



773 



Thus a quarter-turn of the regulating lever raises the valve V s and puts 

 the cylinder into communication with the pressure supply. On the com- 



FIG. 385. Portable Riveter. Hinged Type. 



FIG. 386. Portable Bear Riveter. 



pletion of the working stroke a half-turn in the opposite direction closes 

 the valve V s and opens valve V D , putting the cylinder into communication 

 with the discharge passages. The main ram is drawn back on its idle stroke 



