Electro-mechanical cylinder lock-key combination with optical code
An electromechanical cylinder lock-key combination includes a cylinder housing and a cylinder core rotatably arranged in the cylinder housing and having a key-way for receiving a key. A plurality of key actuated moveable blocking elements block the rotation of the cylinder core unless a correct key is inserted in the key-way. An optical code reader in the lock reads an optical code element provided on an inserted key. At least one of said blocking elements functions as a bar element barring insertion of the key into the key-way unless a correct optical code element is provided on the key. By using at least one of the mechanical elements already present in the lock as part of the electronically controlled blocking mechanism, in combination with the use of an optical code requiring no moveable parts for the reading thereof, space requirements in the lock device are kept to a minimum.
1. An electromechanical cylinder lock-key combination, comprising:
a housing having a bore;
a core rotatably arranged in said bore and having a key-way for receiving a key having a grip portion and a bit portion;
a plurality of key actuated moveable blocking elements for blocking the rotation of said core relatively to said housing unless a correct key is inserted in said key-way;
an electronic processing unit;
an optical code element provided on said bit portion of said key;
an optical code reader provided in said lock;
characterized by
a bar element comprising at least one of said key actuated moveable blocking elements, said bar element barring insertion of said key into said key-way when movement of said bar element is prevented,
an electronically controlled latch element moveable between a latching position, wherein movement of said bar element is prevented by said latching element, and a releasing position, wherein movement of said bar element is allowed by said latching element, and
a means for moving said latch element to said releasing position upon detection by said optical code reader of a correct optical code element on said key.
2. The combination according to claim 1 , wherein said optical code element is a holographic image.
3. The combination according to claim 2 , wherein said holographic image is provided with a surface essentially flush with a surface of said bit portion of said key.
4. The combination according to claim 2 , wherein said optical code reader comprises a laser diode and an optical sensor.
5. The combination according to claim 1 , wherein said optical code element comprises a bar code.
6. The combination according to claim 5 , wherein said optical code reader comprises a light emitting diode and an optical sensor.
7. The combination according to claim 2 , wherein said bar element is a pin having an indent for receiving a portion of said latch element.
8. The combination according to claim 7 , wherein said latch element is provided on a bendable element.
9. The combination according to claim 8 , wherein said bendable element is a piezo-electric bender.
10. The combination according to claim 2 , wherein said latch element is provided with a tapering flange arranged to urge said latch element towards said bar element when inserting a key having an incorrect optical code element.
11. The combination according to claim 2 , wherein said bar element is part of an inner pin tumbler.
12. The combination according to claim 1 , comprising a piezoelectric electric generator arranged to convert mechanical power generated by inserting said key into said core to electrical power.
13. The combination according to claim 12 , comprising a spring biased striking pin moveable by means of said key to and from a position, wherein it exerts a force on said piezo-electric generator.
14. The combination according to claim 12 , comprising a bendable element on which said latch element is provided, and means for supplying electric power generated by said piezo-electric generator to said bendable element so as to move said electronically controlled latch element to its releasing position upon detection of correct optical code element.