KEY AND CYLINDER LOCKING ASSEMBLY CORRESPONDING TO SAID KEY

This invention is in the field of security locks in which the aim is to control key duplication. In this context, the invention concerns a security key and a locking assembly formed by said key and a lock cylinder with which the key is designed to cooperate.

The locking assembly according to the invention comprises a key and a lock cylinder comprising a rotor and a stator, in addition to a set of pins and counter-pins which, by their respective positioning, enable rotation of the rotor in the stator, so as to proceed to locking or unlocking the lock.

The key according to the invention classically comprises a bow and a blade designed to be inserted into the keyway of the lock cylinder. Keys preferably used belong to the type of bit keys in which the blade has impressions engraved on the faces and the edges to cooperate with the pins in the lock cylinder when the blade is inserted into said lock cylinder. The pins are placed in bores arranged radially in the cylinder, said pins being mobile in translation in their respective bores and spring-loaded so as to be urged towards the middle of the lock cylinder and to move in the reverse direction when the key is correctly positioned in the cylinder.

When the appropriate key is inserted, that is, the key whose impressions have the right dimensions and are correctly placed on the blade, each of the pins penetrates into the matching impression recess. The pins are thence placed in an opening position in which they allow the rotor to turn in the stator of the cylinder and thereby unlock the locking assembly.

The large number of impressions and the way in which they are positioned, at best rather on the key faces than on the key edges, make duplication of said keys difficult, thus increasing the security of the locking assembly.

This invention proposes means to produce the signature pattern of security keys in a different way. According to an advantageous characteristic of the invention, the blade of the key axially comprises a window that forms an opening through the thickness of the blade from one face to the opposite one, and at least one roller is mounted on a spindle transversely to the window. The diameter of the roller is determined such that when the key is inserted fully into the keyway of the lock cylinder, the surface of the roller cooperates with the end of a pin placed radially in the lock cylinder. Several rollers can be mounted in the window one after the other in succession along the axis of the blade and the successive rollers can have different diameters.

A key is thus proposed which cannot be duplicated by machining, particularly with respect to its signature pattern which is determined by the rollers. The combination of different positions of rollers having different diameters provides numerous possibilities for obtaining a unique key signature pattern.

According to a characteristic of the invention, the diameter of the roller can be greater than the thickness of the blade, such that said roller, when mounted on a spindle fixed in the median plane of the key, projects from both faces of the blade. A security key is thus proposed comprising elements projecting from the blade faces which are different from the known impressions which are hollowed out as recesses in the blade in the case of usual bit keys, and which nonetheless do not require complex machining.

The use of a roller to cooperate with the pins means that a symmetrical key can easily be produced, that is, a key whose blade can be inserted into the keyway of the lock cylinder in either direction. When impressions are made on a face or side of the blade, identical impressions must be made on the opposite face or side symmetrically with respect to a point on the median axis of the key at keyway level. When using a roller, the symmetrical configuration can be obtained with ease by centering the roller on the median axis such that there is an identical protuberance on either side of the key.

Another advantage in using a roller is the ease with which the key slides into the keyway of the lock cylinder. The roller is mounted to rotate freely around its axis, so that when the key is inserted into the keyway it slides easily over the pins along its pathway. It is understood that the key will slide easily both when it is being inserted into the keyway and when it is being removed from it.

The invention also proposes a locking assembly comprising a key and a lock cylinder comprising a rotor and a stator, in addition to a set of pins and counter-pins which, by their respective positioning, enable rotation of the rotor in the stator for locking or unlocking.

According to an advantageous characteristic of the invention, the pins are especially arranged to slide radially in the rotor so that each one corresponds to a roller on the security key when the key is inserted into the lock cylinder as far as it will go.

In a preferred embodiment according to the invention, a set of rollers can be arranged axially in series in the window formed in the thickness of the key blade, the being provided a corresponding set of pins in the lock cylinder, with the number of pins in accordance with the number of rollers and the space between each pin in their axial arrangement in accordance with the space between each roller.

It is easily understood that said pins will be driven into the rotor to different depths, depending on the diameter of the corresponding roller, when the key is inserted as far as it will go.

The keyway made in the lock cylinder comprises two grooves placed symmetrically on either side of the keyway so that those rollers the diameter of which is larger than the thickness of the blade (and which therefore project beyond the edge of the blade) can pass through the keyway. The two grooves on either side of the keyway thus form a guide-way for the peripheral surface of the rollers.

The invention will now be more completely described in relation with its preferred characteristic features and their advantages, referring to FIGS. 1 to 5 in which:

FIG. 1 is a front view of a key according to an embodiment of the invention which comprises four rollers placed axially in a window formed in the middle of the key blade;

FIG. 2 is a bottom view of the key illustrated in FIG. 1;

FIG. 3 is a cross-section of the security cylinder corresponding to the key illustrated in FIGS. 1 and 2;

FIG. 4 is a schematic drawing illustrating the cooperation of a key according to the invention with the corresponding security cylinder, with the cylinder only being represented partially;

and FIG. 5 is a cross-section of the assembly formed by the key and pin cylinder as illustrated in FIG. 4 in the plane of the key.

As illustrated in FIG. 1, the key comprises a bow 2, partly visible, and a blade 4 designed to be inserted into the lock cylinder. An intermediate neck 6 is formed between the bow and the blade. At its junction with the blade, it has two shoulders that prevent the key from going any further when it is inserted into the lock cylinder.

Blade 4 has a flat shape, here of rectangular section, and comprises a free front end 8 placed axially opposite the neck, cut to form a point. The blade has two edges 10 and 12 and two main faces 14 and 16.

According to the invention, the blade has a window 18 which forms an opening through the key from one side to the other, extending axially and centrally along the blade, that is, at an equal distance from the edges. It can be understood that, in this arrangement, the median axis of the window is the same as that of the median axis of the blade.

Rollers 20 are placed in the window. They are each mounted to rotate freely around a spindle 22 placed transversely in relation to the window. In the illustrated example, there are four rollers, placed successively along the window.

Each of the rotating spindles is mounted in a blind hole which extends transversely from one of the blade edges at an equal distance from both faces. The rotating spindle is inserted into the blind hole via said edge until it comes up against the bottom of the blind hole. Said hole has a depth such that the bottom of the blind hole is situated transversely outside the window, such that the spindle inserted into the hole passes through the window.

Each roller is mounted to rotate freely around its spindle which is placed transversely in relation to the median blade axis, such that each roller is designed to turn in a direction parallel to said median blade axis, which corresponds to the direction in which the blade is inserted into the lock cylinder. As described below, this facilitates insertion and removal of the key with respect to the lock cylinder. The roller here is in the form of a straight cylindrical roller, it being understood that it could alternately take other forms provided it fulfills its role of cooperation with the corresponding pin of the lock cylinder and enables the roller to slide past the pins when the key is inserted into the keyway. The straight cylindrical form is the most suited to cooperate with the end of the pins when they are directed radially in the rotor at an angle with respect to the generatrix of the cylindrical circumference of the roller.

The rollers can be of different diameters. Depending on their diameter, they may or may not project beyond the blade. Thus, a roller will project beyond the blade when its diameter is greater than the thickness of the blade, whereas it will be entirely contained within the thickness of the blade when its diameter is less than that of the blade. It is understood that since the rotating spindle is inserted into a blind hole which extends at an equal distance from the blade faces, the roller will protrude the same distance beyond each blade face.

As shown in FIG. 2, the center-to-center distance between two neighboring rollers remains the same along the entire window. That center-to-center distance(marked d in the figure) is specified to two rollers can be placed side by side without touching each other, whatever their diameter.

The number of rollers and the different available sizes of each roller, results in a very large number of possible combinations, which offers a very wide signature pattern choice for this type of key.

The blade can also comprise impressions 24 (as shown in FIG. 4) engraved on the key faces or on the key edges so as to form recesses of different dimensions and depths, as would be known from previous constructions. Said impressions may have cup forms, drilled to various depths with respect to the plane of one of the blade faces. In the particular case described, the impressions are distributed symmetrically with respect to the median axis so as to make the key reversible, that is, to enable the blade to be inserted into the keyway indifferently in one direction or in the other. It can understood that said impressions are positioned to take into account the presence of the window on either side of the key and the presence of blind holes through the edges.

We are now going to describe a process to construct a key as described previously. The manufacturing process comprises three distinct successive steps, that is, a first machining step during which the basic elements of the key are made, a second mounting step in which a key signature pattern according to the invention, specific in that it corresponds to a lock cylinder, is created by assembling the different components of the corresponding key in a pre-determined configuration, and a third machining step in which additional operations are carried out to form the impressions on the blade.

The first step consists in machining the window to be formed in the key and the blind holes. The result is a standard key model, different from regular keys in that it has a window, but which can be used for different key models according to the invention.

The spindles are also made during this first step and are designed to be inserted into the blind holes during mounting. Each of the spindles is machined in the usual way to obtain a pre-determined diameter and length. Finally, the rollers are made with different diameters so that they can be adapted to the specific needs of each of key.

The key bittings are obtained in the second step by mounting at least one roller of specific diameter in the window. The number of rollers, their respective diameters, and their arrangement from one side of the window to the other, offer a large number of signature patterns which give the key its uniqueness and traceability.

During mounting of each of the rollers, the roller is held in place in the window at the level of one of the blind holes while inserting a rotating spindle into said blind hole so that it passes through the hole engraved in the roller. When the spindle is pressed up against the bottom of the blind hole, the spindle is prevented from moving by crushing the edge of the blind hole receiving the spindle in order to reduce the opening diameter of the hole and prevent the spindle from moving. Said fixation by crushing the edges has the advantage of preventing the key from being dismounted.

The signature pattern which is specific to said key and makes it unique and which therefore contributes to the security of the locking assembly it is a part of, is also obtained by machining impressions during the third step. According to the invention, said impressions are machined after forming the window and holes so that the impressions will be positioned around them. The layout of the impressions is specific to the key and corresponds to a specific layout of the cooperating elements comprised in the lock cylinder with which the key matches.

As illustrated in FIGS. 3 to 5, a key according to the invention is designed to cooperate with a lock cylinder 26 specific in that it comprises a series of pins designed to cooperate with the series of rollers.

The cylinder comprises a rotor 28 designed to turn inside a stator 30. The rotor has a keyway 45 into which the key is designed to be inserted. Said keyway has two grooves 46, positioned symmetrically on either side of the keyway, approximately in the middle. The keyway is staggered with respect to the axis of the cylinder along one of the diameters of the cylinder, as seen in FIG. 3.

A set of bores 32 is made in the cylinder, extending radially from the outside of the stator to the keyway of the rotor, comprising two parts machined in the rotor and stator respectively. An assembly formed by a pin 34 and a counter-pin 36, independent of each other, is installed in each of the radial bores and pushed towards the inside of the cylinder by a spring 38, supported by the counter-pin. The bottom of the bore comprises a shoulder that enables a pin head to pass through so that it is in contact with the key and prevents the body of the pin going any further by the action of the spring. The pin head, opposite the counter-pin, has a dome-shaped end, approximately the shape of a spherical dome. This shape is particularly appropriate for the pins to take up position opposite the circumference of the rollers mounted in the axis of the key.

In the rest position of the cylinder, that is, in the position it takes up naturally when the key is not inserted in the lock cylinder, the proximal bore in the rotor is positioned at an angle in the extension of the distal bore in the stator, such that the pin and its corresponding counter-pin can slide along the bore formed by the two parts combined. Furthermore, the pin is pushed into the rotor by the spring supported by the counter-pin, such that, in the rest position, without a key inserted into the cylinder, the counter-pin extends partly into the rotor and partly into the stator, preventing the rotor from rotating in relation to the stator.

As illustrated, the pin and counter-pin are both dissociable elements one of which has a convex contact face 40 and the other a concave contact face 42. Said faces have a radius of curvature approximately equal to the radius of the rotor. The rotor is thus designed to turn inside the stator when the contact faces of the pin and the counter-pin are positioned at the junction between the rotor and the stator.

It is understood that the movement of the rotor in the stator will only occur when the pins are placed at the correct height in their radial bore, so that only the pins are in the rotor and only the counter-pins are in the stator.

To achieve this, the correct key must be used, that is, the key whose impressions and rollers are of the right dimension and are correctly placed on the blade, inserted correctly until it comes up against neck 6 in the cylinder.

During insertion, the main action of the blade is to push the pin heads towards the stator, therefore compressing the spring via the counter-pin. When the key is in place, the different pins are pushed by the counter-pins to the bottom of the corresponding impressions and if the impression is in the correct place and of correct dimension, the assembly formed by the pin and counter-pin is adjusted in radial position so that the opposite faces are located at the junction between the rotor and the stator, which can turn freely.

Impressions of different depths and rollers of different diameters will be made to obtain a unique key that corresponds to the dimensions of the pins placed in a unique manner in the lock cylinder.

For example, on FIG. 3, a dotted line is used to indicate the shape of the impressions that would enable the lock to be opened and a solid line to indicate the actual shape of the key. It can be seen that a set of pins are arranged to be activated by a set of impressions made on one of the edges and that the other pins are arranged so as to be activated by a set of impressions made on one of the faces. As illustrated, depending on whether an impression is too deep or is absent at the required place, the assembly formed by a pin and counter-pin will be driven more or less into the bore and the pin or the counter-pin then prevents the rotor from turning.

The invention also covers a not represented embodiment in which at least some of the rollers have an annular groove around the circumference of the roller. The groove can advantageously have an asymmetrical hollow profile like the other impressions on the key to cooperate as well as possible with pins that move into them at an angle. It should be noted that the groove is perfectly compatible with the role of guide roller to facilitate insertion of the key until it cooperates with the cylinder. For this the groove needs to be formed in a central part of the roller, leaving the original cylindrical part on either side.

According to the invention, the lock cylinder comprises a specific series of pins, in which each of the pins is designed to cooperate with one of the rollers on the key previously described. The set of bores 33 corresponding to this specific series extends along an inclined axis (as shown in FIGS. 3 and 4) with respect to the axis perpendicular to the rotational axis of the rollers such that it points to the rotational axis of the rotor. In this way, the pins and counter-pins designed to slide in said bores can be placed on either side of the curved junction plane between the rotor and the stator.

As can be seen on FIGS. 4 and 5, the number of rollers will be at least equivalent to the number of pins placed in series in the cylinder specifically to be activated by said rollers. The sizes of the rollers are chosen according to the shape and dimension of the pins so that the pins are correctly retracted when the key is inserted into the keyway as far as it will go in order to cause rotation of the rotor.

It is understood that the diameter of the rollers is chosen according to the dimension of the pins. In the rest position of the lock cylinder, certain pins can be arranged so as to project further into the keyway than the other pins, and said pins are made to correspond with the rollers whose diameter is smaller than the others. Advantageously, the fact that each of the rollers is mounted to rotate freely around its axis enables the key to be easily inserted without striking the pin heads projecting into the keyway. A large diameter roller radially pushes said pin heads out of the way without difficulty until it comes into contact with its corresponding pin head when the key is inserted into the lock cylinder as far as it will go, and the pin heads that were pushed away radially during insertion of the key return to their original position under the action of the corresponding springs after the large diameter roller has passed.

When the key is inserted into the keyway of the lock cylinder, the large diameter rollers which project on either side of the blade slide into the grooves formed symmetrically on either side of the keyway. The grooves are dimensioned to let the largest diameter roller pass through and they are useful in centering and guiding the key when being entered in the cylinder.

The above description clearly explains how the invention enables its objectives to be achieved, particularly its security objectives, by proposing a key whose duplication is impossible without having a blank key with rollers. The context is that of a security key to which a signature pattern is to be given. According to the invention, said signature pattern is obtained by added elements that can form either embossed areas or hollowed depressions whereas previous keys would lead only to vary the depth of depressed impressions. Providing for added elements projecting out of the blade beyond its faces also enables the key to be guided during its insertion into the lock cylinder. The added element has a cylindrical or spherical shape and is mounted rotationally, which has the advantage of minimizing the friction against the pins that project into the keyway when the key is inserted into the lock cylinder. Each roller is arranged so that it can turn round in a direction parallel to the direction in which the blade is inserted into the lock cylinder, which facilitates the displacement of the key in the lock cylinder, during both insertion and removal, since the key is free to rotate. The rollers cylindrical or spherical shape also facilitates the design of a reversible key.

Furthermore, the fact that the signature pattern of the key is obtained through the combination of added elements means that production of the basic elements of the key can be standardized while enabling duplication of the keys to be controlled, due to the fact that the assembly of the rollers in the key in the production unit cannot be changed subsequently and to the many possible combinations of said elements.

KEY AND CYLINDER LOCKING ASSEMBLY CORRESPONDING TO SAID KEY

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