Briefs on Centre Buffer Coupler (CBC)
Coupling facilitates inter connection of rolling stock to form a train. Due to certain limitations of age old srew coupling system, CBC becomes the most useful & viable choice. There are certain features of CBC which makes it an unanimous choice & extensively used in most of the freight cars, EMU coaches & all of the LHB coaches of Indian Railways.
It transmits both draft & buffing load between vehicles and to/ from under-frame. It absorb high frequency forces during impact & dissipates low frequency forces to protect the vehicle from damage. It has got multi functional units like Draft+Buffing & Automatic FP+BP connections.
Advantages of CBC
Automatic coupling type & Quick detachment possible, which in turn is safe for shunting staff & reduces time required.
Less staff for uncoupling.
Prevention of uncoupling in the event of derailment/accident.
Anti-climbing feature (for LHB coaches) to prevent damage to life & property during accident.
Types of CBC adopted in IR
AAR E/F type used in wagons.
AAR(H) type Tight lock used in LHB coaches.
Dellner Coupler used in LHB coaches.
Rigid Type Schaku coupler used in DMU/EMUs.
Slackless drawbar in BLC wagons.
Transition coupling (e.g. in BOBYN).
Hook type in MG/NG stocks.
Main Components of CBC
Coupler body - Knuckle - Lock.
Lock lifter assly.
Yoke,Yoke pin,Yoke pin support.
Fitted with coupler head. Used to couple two coupler heads of two coaches/wagons.