Clutch mechanism for electromechanical lock cylinders

1. A clutch mechanism for an electromechanical lock cylinder, comprising:

an electromagnetic motor ( 2 ) having an output shaft connected to a threaded spindle ( 3 );

a movable cart ( 4 ) axially displaceable by said spindle ( 3 ), the movable cart ( 4 ) in turn comprising clutch pins ( 12 );

a resilient device disposed in an interior of said movable cart ( 4 ), said resilient device being constituted by two front springs ( 26 ) joined together at one of their ends by a common transverse portion ( 26 ′) engaged in a valley of the spindle ( 3 ) thread, said resilient device being configured to move the movable cart ( 4 ) via said common transverse portion ( 26 ′) between a disengaged position and an engaged position, such that in the disengaged position, the front springs ( 26 ) are compressed and in the engaged position said common transverse portion ( 26 ′) is deformed, such that in both positions said common transverse portion ( 26 ′) carries out a continuous thrust on the spindle ( 3 );

wherein said front springs ( 26 ) are constituted by compressions springs; and

wherein said compressions springs ( 26 ) are constituted by coil springs.

2. The clutch mechanism according to claim 1 , further comprising a control circuit of the electromagnetic motor ( 2 ) which, in case of blocking the movable cart ( 4 ) in the engaged position by the action of a user, said control circuit detects the latching of the clutch pins ( 12 ) and continues compressing the front springs ( 26 ) by the action of the spindle ( 3 ) on the common transverse portion ( 26 ′) up to a such a position that when the blocking action by the user is finished, the clutch pins ( 12 ) are released and the movable cart ( 4 ) is moved up to the disengaged position by decompressing the front springs ( 26 ).

3. The clutch mechanism according to claim 2 , wherein the control circuit detects the latching of the clutch pins ( 12 ) by detecting an excess of an energy consumption in the compression of the front springs ( 26 ) carried out by the action of the spindle ( 3 ) on the common transverse portion ( 26 ′) when trying to carry the movable cart ( 4 ) from the engaged position to the disengaged position.

4. The clutch mechanism according to claim 3 , wherein said front springs ( 26 ) are coupled in tubular portions ( 29 ) departing from the bottom of side recesses ( 25 ) of a base ( 10 ) comprised in the movable cart ( 4 ), said side recesses ( 25 ) being located at diametrically opposite points of the inner face of the base ( 10 ) of the movable cart ( 4 ).

5. The clutch mechanism according to claim 3 , further comprising guides ( 8 ) guiding the movable cart ( 4 ) in its axial movement, said guides ( 8 ) forming part of a front lid ( 5 ); said guides ( 8 ) are coupled and guided into through bores ( 9 ) established in the tubular portions ( 29 ).

6. The clutch mechanism according to claim 2 , wherein said front springs ( 26 ) are coupled in tubular portions ( 29 ) departing from the bottom of side recesses ( 25 ) of a base ( 10 ) comprised in the movable cart ( 4 ), said side recesses ( 25 ) being located at diametrically opposite points of the inner face of the base ( 10 ) of the movable cart ( 4 ).

7. The clutch mechanism according to claim 2 , further comprising guides ( 8 ) guiding the movable cart ( 4 ) in its axial movement, said guides ( 8 ) forming part of a front lid ( 5 ); said guides ( 8 ) are coupled and guided into through bores ( 9 ) established in the tubular portions ( 29 ).

8. The clutch mechanism according to claim 1 , wherein said front springs ( 26 ) are coupled in tubular portions ( 29 ) departing from the bottom of side recesses ( 25 ) of a base ( 10 ) comprised in the movable cart ( 4 ), said side recesses ( 25 ) being located at diametrically opposite points of the inner face of the base ( 10 ) of the movable cart ( 4 ).

9. The clutch mechanism according to claim 8 , further comprising axial holes ( 17 ) in the base ( 10 ) wherein the clutch pins ( 12 ) are housed, which are arranged in a diametrical direction and perpendicular to the diametrical direction in which the tubular portions ( 29 ) are located.

10. The clutch mechanism according to claim 8 , further comprising guides ( 8 ) guiding the movable cart ( 4 ) in its axial movement, said guides ( 8 ) forming part of a front lid ( 5 ); said guides ( 8 ) are coupled and guided into through bores ( 9 ) established in the tubular portions ( 29 ).

11. The clutch mechanism according to claim 1 , further comprising guides ( 8 ) guiding the movable cart ( 4 ) in its axial movement, said guides ( 8 ) forming part of a front lid ( 5 ); said guides ( 8 ) are coupled and guided into through bores ( 9 ) established in the tubular portions ( 29 ).

12. The clutch mechanism according to claim 11 , further comprising axial holes ( 17 ) in a base ( 10 ) wherein the clutch pins ( 12 ) are housed, which are arranged in a diametrical direction and perpendicular to the diametrical direction in which the tubular portions ( 29 ) are located.

13. The clutch mechanism according to claim 1 , wherein said coil springs ( 26 ) are elongated in a direction generally parallel with said spindle ( 3 ), and said common transverse portion ( 26 ′) extends between said coil springs ( 26 ) in a direction generally transverse to said spindle ( 3 ).

14. The clutch mechanism according to claim 13 , wherein

said movable cart ( 4 ) comprises a base ( 10 ) having recesses ( 25 ) therein and tubular portions ( 29 ) projecting in said recesses ( 25 ) from a bottom of said recesses ( 25 ); and

said coil springs ( 26 ) are respectively mounted about said tubular portions ( 29 ).