RU2589538C2 - Flat key for lock cylinder and lock cylinder - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: flat key (1, 1′) for locking cylinder, especially for locking systems, comprising a key back and a toothed key bit arranged opposite same, for positioning sprung core and housing rods in locking cylinder, comprises respectively at least two grooves (2, 3) on one or both flat sides, said grooves engaging in each other from flat side and overlapping each other with divergent groove directions. Two overlapping grooves (2, 3; 2′, 3′) are undercut in opposite directions in such a way that, as a result of undercuts, in at least one groove (2, 2′), centre (4) of groove base is covered in direction normal to longitudinal central plane (6). Intersection of two grooves (2, 3) provides edge (5) having a traceable position. Overlapping grooves (2, 3; 2′, 3′) can overlap with an opposing groove (42) as a guiding profiled groove in relation to longitudinal central plane (6). Edge (5) inside overlapping grooves (2, 3; 2′, 3′) can be flattened to form a bearing surface (51) for a tracing element (11, 12) in locking cylinder.

EFFECT: high reliability.

9 cl, 6 dwg

Description

Technical area

The present invention relates to a flat key for a lock cylinder, first of all integrated lock systems with essentially flat and approximately parallel flat sides of the key, the back side of the key and the toothed beard of the key opposite to it, for positioning the split pins of the core and the body of the lever pins which in the corresponding key channels are spring-loaded by the cores of the cylinder against the end side of the beard of the key towards the rear side of the key, moreover, on the flat sides of the key, embedded grooves are provided as variable profile elements and as guiding profile elements, at least two grooves of one side of the flat key, the cutting direction of which are different, overlap, so that due to the intersection of both grooves, an edge is read in the direction normal to the longitudinal median plane of a flat key. In addition, the invention relates to a lock cylinder for such a flat key.

State of the art

The protection of life, the private sphere and property is in the first place. Therefore, the lock and key are given special importance. In unified lock systems, access zones are determined, which occurs due to the correlation of each system key to one or more locks. This is a correlation or exclusion of a key and a lock with respect to the locking function in a single lock system based on lock cylinders with flat keys, etc. achieved due to the profile of the cross section of the keys and the cross section of the key channel. Only if the contour of the cross section of the key channel corresponds to the cross section of the flat key or covers it, the key enters the lock. As soon as the cross-sectional contour of the flat key crosses the cross-sectional contour of the key channel, the key does not have locking rights with respect to the above lock cylinder.

Of course, this relationship between the key and the lock cylinder acts on the profile, i.e. the cross section of the key, especially the flat key, the key channel of the lock cylinder, also for a separate cylinder and a separate key, which is not a direct part of a single system of locks.

Security requirements correspond to the impossibility of simply copying a key. Through security cards and strict personality control, an authorized person can obtain a spare key from the original manufacturer. If there are key blanks in the trade, the key workshop with the help of a copy-milling device can produce a spare key by manufacturing a gear part on the end side of the key. In addition, if the copy-milling device can also read the cross-sectional profile on the flat sides of the original key, and if there are corresponding milling tools, then the spare key can also be made by cutting the metal plate. That is, if until now due to the restriction of free access on the market, the production of spare keys for blocked key profiles was not possible due to the lack of an appropriate blank, today, for key workshops, there are already technical possibilities for making copies of the key, both in relation to the teeth and regarding profile. The key profile is read mechanically or optically from the side. After this lateral reading, cutting or feeding of one or more cutters for the manufacture of U-shaped, V-shaped or rectangular grooves follows. Due to the inclined installation of the key blank, the grooves can also be made obliquely to the midline of the cross-section of the profile, for example, as grooves with undercut.

At the same time, it is problematic that key manufacturing workshops usually make the cross section of the key a little “smaller”, that is, they make all the grooves slightly wider and deeper so that the key can be inserted into the key channel. Due to this, it constantly happens that the key can also be entered into the locks for which it is not provided at all (the so-called lateral locks). Thus, the entire unified lock system is often depreciated.

In EP 1362153 B, a profile system was proposed for making a cross section of flat keys with essentially flat and approximately parallel flat sides and corresponding key channels in the lock cylinder, which does not allow the profile to be completed in one operation with the then milling device for the profile of keys that can used in key workshops. This was achieved in the case of flat keys with essentially flat and approximately parallel flat sides and corresponding key channels in the lock cylinder due to the fact that at least one more groove as a branch leaves from at least one groove, in particular the guide profile, and that the directions of cutting the grooves and branching grooves were different and, for example, diverged by 60 °. As a result of lateral reading of the grooves of the profile of the original key during copying, the branch groove was not registered or was only registered incompletely. They would have to be made by fixing the workpiece and re-reading the original. Fixing for the position of the midline of the profile groove deviating from the initial direction of cutting the groove of the profile at an angle inevitably leads to lateral displacements, as a result of which a branching groove or an additional groove extending sideways from the groove cannot be made either in accordance with dimensions and functions, nor economically.

Economical and accurate manufacturing in practice was possible only at the key manufacturing factory, which was equipped with profile broaching machines and large milling centers, without fixing errors, since error-causing individual work operations with repeated measurement of the initial position were not required.

Nevertheless, in principle (even if at high cost) it is possible to copy such keys if only grooves that are clearly large (wider and deeper) are performed. Although according to EP 1362153 B it is provided that other grooves are provided in close proximity, as a result of which, due to intensive milling, the key loses its stability; that is, a key workshop cannot simply mill such a large groove that this groove of the copied key will cover the groove and branch groove of the original key. But the copying workshop can make the groove and branch groove slightly enlarged, while the key does not lose its stability or its locking ability.

From AT 500 638 B, it is known to implement a read pin in a lock, which in the case of an undercut groove determines whether it really has an undercut or if it was simply replaced by a correspondingly wider V-shaped groove. In the case of this reading pin, the disadvantage was that it operated in only one direction. This means that if the lock was not installed correctly, then you could open it with an illegally copied key, but after that it could no longer be closed. But also with proper installation it was problematic if the illegally copied key was used by authorized people; they can lock themselves and after that no longer open a room or apartment.

In addition, the security was also insignificant, since only the presence of an undercut was read, but not the exact execution of the groove and branch groove.

Disclosure of invention

The objective of the present invention is to provide a flat key, in which the copying is more complicated than in the case of keys according to EP 1362153 V or AT 500638 V. According to the invention, it is solved due to the fact that both overlapping grooves have undercut, moreover counter (in opposite directions), and that due to these undercuts of at least one groove, the middle of the bottom of the groove when viewed in the direction normal to the longitudinal median plane of the key is hidden and that at least in one groove, the transition from the side surface of the groove to the bottom of the groove is also hidden by undercut when viewed in the direction normal to the longitudinal median plane of the key.

The idea of this is as follows. If the bottom of the groove is at least partially hidden, then determining the exact parameters of the groove (depth, width, angle, position) is especially difficult. The hem that results from the intersection of both grooves can be read in the lock. But this edge cannot be directly made in the workshop for the manufacture of keys, but it is formed precisely due to the intersection of both grooves. If the parameters of at least one groove cannot be precisely determined, then this edge is not in the intended place and the key does not lock.

Because of this edge, which can be read out, with copy milling it is not possible to make just a trapezoidal groove that encompasses both grooves of the original key. By reading the edges in the lock, it is imperative that both grooves are made correctly so that the key locks.

Particularly favorable if both angles of undercut are different. Since in this case, finishing milling with a trapezoidal milling cutter also causes another embodiment of at least one side surface of the groove. In addition, due to this, it is impossible to draw a conclusion about the angle of another groove from the angle of one groove, which would facilitate the measurement of the parameters of the original key.

With regard to the guarantee that the proposed implementation in any case also always exists in unified lock systems for security reasons (that is, for all keys, even for a key with the lowest access level), it is advisable if both grooves are provided as guiding profile elements. The guide profile is made inside a single lock system for each key, and thus in any case the desired security is ensured.

It is advantageous if at least one of the two grooves is superimposed on the guide profile groove on the opposite side of the key blade. This, as you know, complicates the introduction of manipulation devices.

Finally, it is advantageous if at least one groove-like groove is provided between the coincident grooves and the end face of the key, the side surface of the groove-shaped groove having an angle α of less than 90 °, preferably from 30 ° to 45 °, relative to the median plane of the key blade and the other side the surface of the grooved groove has an angle β from 93 ° to 97 ° relative to the median plane of the key blade. Due to the features known from AT 500 638 B, sharp edges on the key are prevented. The lock cylinder for a flat key of the type described above is equipped with a cylinder body and at least one cylinder core located in the openings of the cylinder body that has a profiled key channel and with lever pins divided into pins of the core and the body, which are located in the holes of the cylinder body and the cylinder core are spring-loaded against the end side of the key beard towards the rear side of the key. The execution of the key channel mirrors the execution of the key: the profiling of the key channel has two outgoing from a common root on the side surface of the key channel, V-shaped diverging edges with correspondingly sharp external angles relative to the side surface of the key channel, which correspond to two overlapping grooves of a flat key. In addition, according to the invention, at least one cylinder core is provided with a reading element which senses an edge arising due to the intersection of both grooves of the flat key and which can also be made in the form of a flat, and if the edge or flat is too low, it locks the lock cylinder.

Thus, the key does not close at either too high or too low an edge: if the edge is too high, then the key does not enter the key channel, if it is too low, the lock is blocked by a reading element.

Advantageously, a sensing element is also provided which senses the presence of undercut of the groove and blocks the lock cylinder in the absence of undercut. This prevents the undercut groove from being replaced with a correspondingly larger V-groove.

The corresponding sensing elements can be shifted approximately radially in the cylinder core or also rotated, and they are placed on the shoulders of the undercut of the key groove or on the edge or flange between the V-shaped diverging grooves in the key. With the right key, the area of the reading element is laid so that it fills the recess in the cylinder core on the outer surface and the housing pin can slip through the filled recess through it during the locking process. The wrong key will either not enter the key channel at all, or the body pin in the plane in which the reading element is located will pop into the recess in the cylinder core, so that it cannot be turned further (but it can be turned back).

Brief Description of the Drawings

Examples of the implementation of the subject invention are presented in the drawings.

The drawings show: in FIG. 1 is a side view of a key; in FIG. 2 - section contour along the line II-II in FIG. 1 with the first proposed profile; in Fig.3 - section contour similar to Figs. 2 with another proposed profile; FIG. 4 shows a cylinder core with a key inserted in accordance with FIG. 1 and 2 and FIG. 5 and 6 show sections along levels V or VI of FIG. 4.

Way (s) of carrying out the invention

Key 1 (flat key) of the unified system of locks has a cross-sectional profile, primarily a guide profile with grooves 2, 3. The guide profile performs the task of positioning the key in the key channel. Both grooves 2, 3 overlap (overlap). The cutting direction X for making the groove 2 and the cutting direction X ₁ for making the groove 3 are different. Thus, it is impossible, based on one direction of cutting, to draw a conclusion about another direction of cutting, which would facilitate measurement of the key.

It is significant that the grooves 2, 3 have an undercut, namely in opposite directions (that is, if we outline the angles X and X ₁ between the direction of cutting and the longitudinal median plane of the key so that they are less than 90 °, then the angle X will be measured by towards the back side of the key and, conversely, the angle X ₁ will be measured towards the key groove.) Due to this, the middle 4 of the groove 2 (and, thus, its depth) cannot be determined by reading along the normal to the longitudinal median plane 6 of the key , which significantly complicates the determination Establishment of the exact parameters of groove 2 (i.e. width, depth, position and angle X). Even the transition zone 4 ′ from the lateral surface to the bottom of the groove is undetectable.

Due to the inaccuracy resulting from this during the subsequent measurement, it is practically impossible that the edge 5 on the copy of the key, which occurs due to the intersection of both grooves 2, 3 and which cannot be milled directly, has the correct distance d from the side surface 7 of the key 1.

In addition, in FIG. 2 dashed lines show the tray-shaped grooves 40 or 41 between the overlapping grooves 2, 3 and the end face of the key with teeth (key barbs). They are part of the variable profile, which arises due to the preservation or removal of individual grooves in the system or the presented raster of all overlapping tray-like grooves 40 or 41 in any case as well. Due to the already mentioned formation of the angle of the lateral surfaces of the groove, a surface structure can be achieved without disturbing edges. In addition, in FIG. 2 shows a guide profile groove 42, the bottom of which is superimposed on the bottom of the groove 2, as a result of which the key channel, with the corresponding matching execution, does not allow the plate to be pushed for reading. This overlap here means the intersection of a tangential plane parallel to the longitudinal median plane 6 on one groove 2 with another opposite groove 42.

In FIG. 3 shows a key 1 ′, which, in addition to grooves 2 and 3, also has grooves 2 ′ and 3 ′, which have the same geometric properties as grooves 2 and 3. Flats were removed from the edge inside grooves 2 ′ and 3 ′ of surface 5 ″ fit.

In FIG. 4 shows the corresponding cylinder core 9 with key 1 according to FIG. 1 and 2, or 3. Both reading elements 11 and 12, which can be more clearly seen in FIG. 5 and 6.

Both reading elements 11 and 12 are held in the corresponding recess of the cylinder core 9 so that they although they can be displaced along the normal to the longitudinal median plane of the key 1, but can not tip over significantly. Both reading elements 11 and 12 have one end free (the lower end, as can be seen in Figs. 5 and 6), the other end is adjacent to the key 1, namely the reading element 11 is to the edge 5 (the contact surface 5 "), and the reading element 12 - to undercut 8. In the area of these reading elements 11 and 12, recesses 21, 22, 31, 32 are milled outside the cylinder core, which gradually become deeper from the outer sides of the reading elements 11, 12 and end in the middle region of the reading elements 11, 12 at 21 ′, 22 ′, 31 ′, 32 ′. These recesses are located in pa parallel planes of perpendicular section, in which pin levers are provided in the cylinder body.

If the cylinder core is rotated so that the pins of the housing reach the area of these recesses, then, with the right key, they slide off the reading elements 11 or 12 at the corresponding level 21 ′, 22 ′, 31 ′ or 32 ′. If the key is wrong, that is, if the edge 5 or the contact surface 5 ′ is too low, or if there is no undercut 8, then the reading elements 11, 12 release the recesses. The springs of the housing pins press into the corresponding recess 21, 22, 31 or 32, so that the housing pins are adjacent to the corresponding level 21 ′, 22 ′, 31 ′ or 32 ′ and the cylinder core 9 cannot be turned further. But since the recesses become smaller when passing in the opposite direction, the cylinder core 9 can be turned back and a suitable key can be pulled out. This works in both directions, that is, also with the double lock cylinders installed opposite.

A particular advantage of this type of reading is that the cylinder body does not need to be changed; all the necessary features can be implemented on the cylinder core 9.

If the grooves 2, 3 in the copy of the key are made too narrow or too small, then the key cannot be inserted into the key channel due to a collision with the corresponding edges in the key channel.

It should be pointed out that in practice it is not necessary to perform additional reading by reading elements 11 and 12 for all the locks of one single system of locks, since the key workshop cannot know whether they are available or not. A key workshop does not copy keys if it does not know if it locks the key or not. Nevertheless, a made spare key might possibly close one or another door, but, for example, not the main entrances. Thus, such a “copy” becomes meaningless.

Claims (9)

1. A flat key (1, 1 ′) for the lock cylinder, first of all integrated lock systems, essentially with flat and approximately parallel flat sides of the key, the back side of the key and the toothed bar of the key opposite to it from the end side for positioning the pins divided into pins the core and the body of the leveling pins, which are spring-loaded in the corresponding key channels by the cylinder cores against the end side of the key beard towards the rear side of the key, with an incision in the flat sides of the flat key these grooves as variable profile elements and as guide profile elements, at least two grooves (2, 3) of one side of the flat key are superimposed, the direction (X, X ₁ ) of cutting which is different, so that due to the intersection of both grooves ( 2, 3) an edge (5) arises, which is readable in the direction normal to the longitudinal median plane (6) of the flat key (1), moreover, from both overlapping grooves (2, 3), both have an undercut, with counter ones, and due to these undercuts (8 ) in at least one groove (2), the middle (4) of the bottom of the groove, when viewed in the direction normal to the longitudinal median plane (6) of the key, is closed, characterized in that the transition in at least one groove (2) also (4 ′) from the lateral surface of the groove to the bottom of the groove is hidden by undercut (8), when viewed in the direction normal to the longitudinal median plane of the key (1, 1 ′). 2. A flat key according to claim 1, characterized in that both angles (X, X ₁ ) of the undercut have different meanings. 3. A flat key according to claim 1 or 2, characterized in that both grooves (2, 3) are provided in the form of guiding profile elements. 4. A flat key according to claim 3, characterized in that at least one of the two grooves (2, 3) is superimposed on the guide profile groove (42) on the opposite side of the flat key (1, 1 ′). 5. A flat key according to claim 1 or 2, characterized in that between the overlapping grooves (2, 3) and the end face of the key is provided at least one groove-shaped groove (40, 41), the side surface of the groove-shaped groove (40, 41) has an angle α less than 90 °, preferably from 30 ° to 45 °, relative to the median plane of the key blade (1), and the other side surface of the tray-shaped groove (40, 41) has an angle β from 93 ° to 97 ° relative to the median plane of the key (one). 6. A flat key according to claim 3, characterized in that at least one tray-shaped groove (40, 41) is provided between the overlapping grooves (2, 3) and the end face of the key, the side surface of the tray-shaped groove (40, 41) having an angle α less than 90 °, preferably 30 ° to 45 °, relative to the median plane of the key blade (1), and the other side surface of the tray-shaped groove (40, 41) has an angle β from 93 ° to 97 ° relative to the median plane of the key (1) ) 7. The lock cylinder for a flat key according to one of paragraphs. 1-6 with a cylinder body and at least one cylinder core located in the opening of the cylinder body, which has a profiled key channel, and with lever pins divided into pins of the core and the body, which are spring-loaded against the end holes in the openings of the cylinder body and the cylinder core sides of the key beard towards the back side of the key, characterized in that the key channel profiling has two V-images originating from a common root on the side surface of the key channel of diverging ribs with correspondingly sharp exterior angles relative to the side surface of the key channel, which correspond to two superimposed grooves (2, 2, 2 ', 3') of the flat key (1, 1 '). 8. The lock cylinder according to claim 7, characterized in that at least one core of the cylinder has a sensing element (11) that reads the edge (5), which is formed due to the intersection of two grooves (2, 3, 2 ′, 3 ′) Of a flat key (1, 1 ″) and which can also be made in the form of a flat (5 ′), and if the edge (5) or flat (5 ′) is too low, it locks the lock cylinder. 9. A lock cylinder according to claim 7 or 8, characterized in that at least one cylinder core has a readout element (12) that senses the presence of undercut (8) of the groove (2) and blocks the lock cylinder in the absence of undercut (8) .

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