Patent ID: 8256253

Claim:
A transmission structure of a cylindrical lock installed on a door, comprising: a tubular shaped element coupled to a handle for actuation; a tube in the tubular shaped element; a pushing part having a hollow portion and a side with at least one pushing section, the at least one pushing section able to push a drive base at an appropriate time; a collar able to be set on an end of the tubular shaped element, one meshing section formed on the collar; an engaging element partly installed in the pushing part, the engaging element being received and axially movable within the hollow portion of the pushing part, another meshing section formed on the engaging element, and the engaging element having at least one pushable section; and a lock set having a lock core linked to a transmission part; rotating the lock core to operate the transmission part of the lock set to push a moving part, causing the engaging element to do axial displacement, and causing the meshing section of the engaging element to move between a first position, where the meshing section of the engaging element disengages the meshing section of the collar, and a second position, where the meshing section of the engaging element engages the meshing section of the collar.