Electronic lock in cylinder of standard lock

An electronic lock device, comprising:

• i) a lock including a mechanical drive train for opening an access door;
• ii) an electronic device for electronically controlling access through the access door;
• iii) said electronic device including a solenoid situated within said mechanical drive train;
• iv) said solenoid having a housing that is rotated as a part of said drive train, said solenoid engaging a drive member upon energization of said solenoid, such that rotation of said solenoid when energized causes said drive member to simultaneously rotate to connect said drive train and to allow access through said access door.

An electronic locking system, comprising:

• a drive member movable between locking and unlocking positions;
• an electronic lock circuit within said locking system;
• a plug having a key engagement for engaging a key means for rotating said plug;
• key means engageable with said key engagement and having electronics for communicating with said electronic lock circuit to operate said locking system;
• and
• a solenoid controlled via said electronic lock circuit that is connected to rotate with said plug and that is engageable with said drive member so as to move said drive member via said plug between said locking and unlocking positions.