Locking cylinder

Details Locking cylinder Locking cylinder

2000-05-19

2002-07-02

Browne, Lynne H. (Department: 3629)

Locks

Operating mechanism

Using a powered device

C070S278700, C070S283100

Reexamination Certificate

active

06412321

ABSTRACT:

FIELD OF THE INVENTION
The invention refers to an electronic locking cylinder provided with electromechanical rotational blocking.
PRIOR ART
The application of electronics for operating locking cylinders presents specific problems relating to the autonomy of functioning by means of incorporation of its own electrical supply source, and attaining a reduced size that can be extreme, in order to be able to place everything in the small space where it can reside in the planar vertical extension of a locking cylinder of European profile (in a shape reminiscent of a pear), since this European profile is used most often and in order to conceive the most unfavorable case of the cylinder types most often employed.
Most of the energy consumption is used for activating the rotational-blocking electromechanical device. The smaller the abrasion in this blocking device, the smaller will be the electrical consumption, and its autonomy of functioning will therefore be greater.
Many rotational-locking electromechanical devices are known in this regard, in which the locking is established by means of a piece that can be displaced vertically in the radial direction at the cylindrical rotational element for which one desires to block the rotational movement.
Among these devices, it is known that the positions of said vertically displaceable piece for rotational locking and release are directly determined by a rectangular cam disk, with rounded ends that is mounted diametrically in the rotational axis of output of an electrical micromotor. The locking position is established when the cam disk is vertical (its larger sides are in vertical position) and vice versa.
The autonomy of the device will be greater, the smaller the abrasion opposing the micromotor drive. For this, in this type of device, clearances are available above and below the ends of the cam disk situated in vertical position or locking position, which clearances are relatively large in size, in order to guarantee that the cam disk will not abrade when being rotated by the micromotor.
Consequently, the rectangular cam disk remains mounted like a brace. Considerable forces that are produced in order to entrain the rotating operation when the device is in the locked position are applied to said brace. These forces are integrally supported by the brace and are transmitted to the micromotor axis in the form of bending moments that produce deformations and permanent clearances, which exercise negative effects on the process, making it worse each time.
Another disadvantage of this type of known device is that it requires a great precision in order to place the cam disk in the vertical locking position; said micromotors lack means to guarantee said precision and require some other complementary means that detects and assures the vertical locking position, which implies expense as well as the necessary space for it that is of critical availability.
If said vertical locking position of the rectangular cam disk is not exact, said clearances at the ends of this cam disk will be greater and will have very negative effects: first, the bending torque on the micromotor axis will be increased, so as to force rotation; secondly a rotational moment will also appear on said micromotor axis; thirdly, the locking position will lose firmness and the device is less reliable.
DESCRIPTION OF THE INVENTION AND ADVANTAGES
The new electronic cylinder comprises: a double-body static frame, of European profile in the form of a pear, for activating the cylinder from the external and internal sides of the lock, each having external and internal rotational cores or rotors which rotate in the recess of said two casings of the static frame and each of which possesses a channel for introduction of the blade of a corresponding electronic key provided with an interactive electronic circuit that can be coded electronically; an electrical contact located in a radial housing of each of said external and internal rotors that communicates with its said key channel coinciding with the place where either one of the two opposing electrical terminals on the blade of said electronic key ends up, when it is inserted operatively in said key channel; an electrically conducting annular track that encircles each one of said external and internal rotors and has its internal face communicating electrically with each said electrical contact of these rotors; an electrical brush, which, in each one of these rotors, communicates electrically with the external face of said annular track and is elastically loaded against a second compression spring; an electronic processing unit that electrically communicates with said electrical brushes of the external and internal rotors; a vertical retractile tumbler that is mounted against a helical compression spring radially at said external rotor and that belongs to a rotational blocking electromechanical device of said external rotor that is electrically connected to said electronic processing unit; a first eccentric cam installed between said external and internal rotors; an external socket enclosed axially between said first eccentric cam and the external rotor; an internal socket enclosed axially between said first eccentric cam and the internal rotor; an external shoe that is installed with axial play between said first eccentric cam and the external rotor, which external shoe has a sliding fit with respect to the inside of said external socket and with respect to a first diametric planar lug of the external rotor, which is located in the recess of this external shoe; an internal shoe which is installed with axial play between said first eccentric cam and the internal rotor, which internal shoe has a sliding fit with respect to the inside of said internal socket and with respect to a second diametric planar lug which is located in the recess of this internal shoe; a first modular box that has dimensions adapted to the inside of a first cast hollow part attached to the external rotor that is made in said static double-body frame, and which first modular box contains said electrical brush of the external rotor, said electronic processing unit and said rotational-locking electromechanical device of the external rotor; a second modular box that has dimensions adapted to the inside of a second cast hollow part attached to the internal rotor that is made in said double-body static frame, and whose second modular box contains an autonomous electrical supply source and the said electrical brush corresponding to the internal rotor; an electrical conductor is connected between said first and second modular boxes.
Overall, said electromechanical device of rotational locking of said external rotor comprises an armature, an autonomous electrical micromotor that has a horizontal output axis of rotation and is located in a housing of said armature, a vertical plate cam disk, a retractile vertical tumbler located in said housing of the armature and sticking out through the upper plane of this armature, a helical compression spring mounted vertically between horizontal first and second walls of said armature and retractile tumbler, respectively, a base anchored at the bottom to said armature in vertical alignment with said retractile tumbler, and a ball disposed freely in a variable space bounded between said plate cam disk, retractile tumbler and base; said plate cam disk has a vertical cam disk front horizontally opposing said ball and projecting in continuous form; said retractile tumbler has an upper planar face in permanent contact with the periphery of said external socket with peripheral chamfer, and opposite to said upper planar face, said retractile tumbler has on the bottom an inclined plane of concave transverse profile circumscribed by an arc of greater radius than said ball and opposing this ball; said base has on the top a horizontal plane with concave transverse profile circumscribed by an arc of greater radius than said ball and which is in permanent contact with this ball and vertically opposing said inclined plane of the retractile tumbler; said b

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