US Patent 9194415 Coaxial tensionable automatic lock

Disclosed is a coaxial tensionable automatic lock, including: a hollow connection rod (1), a top plate (3) and a bottom plate (4) respectively installed on two ends of the connection rod, a connection lock apparatus installed at a lower part of the connection rod and fixed on a surface of the bottom plate, wherein the connection lock apparatus includes: a flange (51) connected to a bottom end of the connection rod, a lock cover (52) sleeved onto an outer wall of the flange, a lock core (53) disposed inside an upper-end chamber of the flange, a lock washer (54) disposed between a lower end of the flange and an opened groove on a face of the bottom plate, and a lifting pin (2) installed in an upper-end hollow chamber of the connection rod, wherein a rotation handle (6) is sleeved onto an upper-end outer wall of the connection rod.