Electromechanical lock assembly

Electromechanical lock assembly, which is configured to be powered upon insertion of a programmable key in a key receptacle, said lock assembly comprising

• a lock body,
• a lock core extending along an axial direction, the lock core being located at least partially within the lock body and selectively rotatable with respect to the lock body along the axial direction, the lock core including the key receptacle for receiving the programmable key,
• a lock bolt operating member rotationally secured to the lock core and configured to move a lock bolt of a lock for locking and unlocking said lock, and
• an electronic access control device,
• an annular element which is rotatably and axially displaceably mounted on said lock core,
• a coupling device arranged to communicate with said electronic access control device and, upon the insertion of an appropriate key in the key receptacle, rotationally lock the annular element to the lock core, thereby enabling rotation of the lock core and thereby enabling locking and unlocking of said electromechanical lock with said appropriate key, and
• a blocking arrangement comprising a retaining device arranged to prevent said annular element from rotating together with said lock core when the lock core is rotated with an inappropriate key, an engagement portion arranged to rotate with the lock core, one contact surface situated on the engagement portion, one contact surface situated on said annular element and a stationary blocking member, wherein said contact surfaces being configured to, upon rotation of said lock core relative to said annular element, axially move said annular element into engagement with said stationary blocking member, thereby blocking further rotation of the lock core and thereby preventing unauthorized locking and unlocking of said lock.