Patent ID: 7073359

Claim:
Rotary locking mechanism, for lock cylinders in electromechanical locks that are operated by means of an electromechanical key incorporating a self-contained energy source, and which comprises a cylinder that is housed in a traditional mechanical lock and which comprises a stator, in the core of which a rotor is housed and operates rotationally, said rotor has a housing for one said key which, on being turned, causes rotation of the rotor and an eccentric thereof which is capable of causing opening of the lock, which rotor has a housing for a locking bolt which is retractable in one said stator in which is housed the actual rotary locking mechanism which in presence of said key produces extension and retraction of the locking bolt ( 6 ), comprising: an electric motor ( 1 ), a locking bolt ( 6 ), an inertial rotating means for converting rotation of the motor ( 1 ) into a rectilinear movement along the axis of said locking bolt ( 6 ), an elastic energy accumulating means arranged in opposition to the retraction travel of the locking bolt ( 6 ), and rectilinear guide means for providing rectilinear guidance of the operating extension/retraction travel of the locking bolt ( 6 ); wherein said electric motor ( 1 ) is activated electrically by the energy source of the key inserted in its housing or in the rotor, said inertial conversion rotating means comprises an axially fixed rotary support ( 4 ) which is linked to the shaft of the electric motor ( 1 ), one or several inertial rotating elements ( 2 ) which, in relation to a coaxial rotation axis with that of the electric motor ( 1 ), produce an increase in the inertial momentum on increasing their rotational speed, an actuator linked to the locking bolt ( 6 ) and which is coaxially movable therewith, a rotational/linear conversion means ( 3 , 7 ) that is installed between the inertial rotating elements ( 2 ) and the actuator ( 5 ) linked to the locking bolt ( 6 ), said elastic energy accumulator is a compressible helical spring ( 8 ) that is installed between the movable actuator ( 5 ) linked to the locking bolt ( 6 ) and the rotary support ( 4 ) axially fixed to the shaft of the electric motor ( 1 ), and such rectilinear guidance means comprises at least two guide shafts or rods ( 10 ) that, joined to one of said elements of movable actuator ( 5 ) and rotary support ( 4 ), closely penetrate through the other of these elements in diametrically opposed positions.