Double locking buckle

A double locking buckle comprising:

• a plug member;
• and
• a socket member,
• wherein the plug member comprises a base part, a pair of lock arms protruding from the base part such that the plug member is coupled with the socket member, and a locking rod protruding from the base part and disposed between the lock arms,
• the socket member comprises two chambers, each of the two chambers including upper and lower plates and sidewalls connecting the upper plate with the lower plate, an open front end to receive each of the lock arms and a hole located on a side of each of the chambers such that each of front ends of the lock arms is coupled with the hole,
• the socket member includes a guide groove longitudinally formed to guide the locking rod and disposed in a middle portion of the socket member,
• the guide groove divides the two chambers into a left chamber and a right chamber formed at left and right sides of the guide groove, respectively,
• the guide groove includes an upward inclined surface starting from a front end of the guide groove to guide the locking rod having a latching groove into the guide groove, and a locking protrusion located at a rear edge of the upward inclined surface and coupling with the latching groove of the locking rod, and
• the latching groove of the locking rod is located at a front lower end of the wing part and configured such a way that the latching groove is unlatched with the locking protrusion by pulling up the wing part.