Locking device

A locking device having a deadbolt within a casing which deadbolt is movable between an advanced position wherein it protrudes from a front face of the casing and a retreated position wherein it is retracted into the casing, comprising:

• a link plate which moves the deadbolt to the advanced position;
• a deadbolt blocking member which is moveable between a blocking position blocking the deadbolt in the advanced position and an unblocking position to allow the deadbolt to move to the retreated position;
• an electrically driven actuator unit which moves the deadbolt blocking member between the blocking position and the unblocking position;
• and
• a control circuit configured to control the electrically driven actuator unit so that once the deadbolt is moved to the advanced position, the deadbolt blocking member is moved to the blocking position by actuation of the electrically driven actuator unit;
• the locking device further comprising a first detector which is configured to detect whether the deadbolt is in the advanced position,
• wherein the control circuit is configured to move the deadbolt blocking member by actuation of the electrically driven actuator unit when the first detector detects the deadbolt is in the advanced position,
• wherein the deadbolt blocking member does not contact the deadbolt when it moves to block the deadbolt.