Wirelessly controlled electric lock

1. A wirelessly controlled electric lock, comprising a lock body ( 2 a ), a key cylinder ( 2 b ), a turn spindle ( 3 ) rotatable by a handle element ( 3 a ) internal of the door, the turning of which enables opening of the lock, an opening spindle ( 4 ) rotatable by an opening element ( 5 ) external of the door, a drive link mechanism ( 41 , 20 , 21 , 22 ) enabling the turn spindle ( 3 ) and the opening spindle ( 4 ) to be coupled with each other for a drive link engagement, such that turning of the opening spindle translates also into a turning motion of the turn spindle, and electrically controlled coupling elements ( 10 , 21 , 22 , 24 , 25 , 26 ), wherein the electrically controlled coupling elements include an actuator ( 10 ) which, in a mode activated by an electrical control ( 12 , 31 , 33 ) transmitted ( 32 ) wirelessly to the electric lock, is adapted to fixedly lock a bolt or plunger ( 10 a ) which, in its fixedly locked condition, enables or activates said drive link mechanism to effect the coupling of the drive link engagement in response to rotation of the opening spindle ( 4 ) by handforce, thereby enabling opening of the lock by continued rotation of the opening spindle ( 4 ), and, without electrical control of the actuator ( 10 ), said bolt or plunger ( 10 a ), upon yielding to the weak returning force of a spring or some other force device, is adapted to disable or not to activate the coupling of the drive link engagement as the opening spindle ( 4 ) is rotated.

2. An electric lock according to claim 1 , wherein the actuator ( 10 ) is a piezoelectric actuator.

3. An electric lock according to claim 1 , wherein the output device of the electrical control ( 12 , 31 , 33 ) is in the form of an access control device ( 31 ), which uses a short range signal ( 32 ) to control electric locks present in several doors.

4. An electric lock according to claim 3 , wherein the electric lock includes an electrical control reception and control unit ( 12 ), which is provided with a transmitter adapted to send a message to the access control device ( 31 ) in case of opening of a door ( 1 ).

5. An electric lock according to claim 1 , wherein the coupling elements include an axially displaceable gear ( 21 ), a cam wheel ( 24 ), and a guide surface ( 25 ) associated with the gear ( 21 ), by way of which the gear ( 21 ) is forced by the cam wheel ( 24 ) to proceed into the engagement with a coupling plate ( 22 ), the coupling plate ( 22 ) rotating along with the turn spindle ( 3 ) and the gear ( 21 ) rotating along with the opening element ( 5 ) external of the door.

6. An electric lock according to claim 1 , wherein the opening element ( 5 ) external of the door is an annular finger wheel fitted around a lock cylinder ( 2 ).

7. An electric lock according to claim 6 , wherein the finger wheel ( 5 ) has its internal periphery provided with a serration ( 5 a ), which is in a meshed engagement with a gear ( 4 b ) rotating the opening spindle ( 4 ).

8. An electric lock according to claim 5 , wherein the opening spindle ( 4 ) has a gear ( 41 ) at one end thereof, with which the axially displaceable gear ( 21 ) is in meshed engagement through the intermediary of a transmission gear ( 20 ) in all of its displacement positions.

9. An electric lock according to claim 1 , wherein the drive link mechanism ( 41 , 20 , 21 , 22 ) and the electrically controlled coupling elements ( 10 , 21 , 22 , 24 , 25 , 26 ) are accommodated in a housing ( 6 ), which is located inside a door on a side of the lock body ( 2 a ) opposite to the key cylinder ( 2 b ), and that the opening spindle ( 4 ) extends through the door.

10. An electric lock according to claim 9 , wherein the opening spindle ( 4 ) is a pliable cable.