An electronic locking system (10) comprises a cylinder (14) housed within and rotatable with respect to a shell (16). A key (18) has a power supply (28). At least one of the key (18) and the cylinder (14) is capable of generating a signal. An electrically powered locking mechanism is housed within the cylinder (14) and includes a lock member (12) movable between an open position and a locked position. The lock member (12) in the locked position interferes with movement of the cylinder (14). A power source (28) is connected to the locking mechanism in response to the signal. The locking mechanism allows movement of the lock member (12) from the locked position to the open position so that the cylinder (14) may be rotated. The cylinder (14) further includes an interfering member (90) that resists movement of the locking member (12). In addition, a biasing mechanism urges the cylinder (14) toward a home position when the cylinder (14) is rotated away from the home position. |