UPPER CONNECTION 



INSIDE VENT TUBE 

 OUTSIDE VENT SUB 



INSIDE VENT BUSHING 

 OUTSIDE VENT TUBE 

 OIL PROOF BEARING - 



VALVE SUB 



VALVE BALL a SEAT ■ 



VALVE SEAT RETAINER 



INNER BARREL 



OUTER BARREL 



INNER BARREL 

 LOWER CONNECTION 



SPRING RING CORE 

 CATCHER 

 TOGGLE TYPE CORE 

 CATCHER 



HARD FORMATION CUTTE 

 HEAD 



CORE CATCHER 

 PROTECTOR 



Figure 33-1. Conventional core barrels (Courtesy Reed Roller Bit Company). 



697 



