AT511096B1 - Flat key for a lock cylinder and lock cylinder - Google Patents

Abstract

A flat key (1) for a lock cylinder, in particular for locking systems, with a key back and a toothed key bit opposite thereto for positioning spring-loaded core and housing pins in the lock cylinder, has in each case at least two grooves (2, 3; 2 ', 3') which engage in one another starting from the flat side and overlap one another with a diverging puncturing direction. The two overlapping grooves (2, 3, 2 ', 3') are undercut in opposite directions, so that due to the undercuts in at least one groove (2, 2 '), the center (4) of the groove bottom in the direction normal to the longitudinal center plane (6) seen, is covered. The intersection of the two grooves (2, 3, 2 ', 3') results in an edge (5) whose position can be scanned. The overlapping grooves (2, 3, 2 ', 3') may overlap with an opposite groove (42) as a guide profile groove with respect to the longitudinal center plane (6). The edge (5) within the overlapping grooves (2, 3, 2 ', 3') can be flattened to a support surface (5 ') for a scanning element (11, 12) in the lock cylinder

Description

Austrian Patent Office AT 511 096 B1 2012-09-15

The present invention relates to a flat key for a lock cylinder, in particular locking systems, with substantially planar and approximately parallel key flat sides, a key back and a counter-toothed key-bit opposite thereto, for positioning of tumbler pins divided into core and housing pins, which are spring-loaded in corresponding key channels of cylinder cores against the face of the key bit toward the key back, wherein in the flat sides of the flat key grooves are provided as a variation profile elements and as a guide profile elements, wherein at least two grooves of a side of the flat key overlap, whose Einstechrichtung is different, so that the intersection of the two grooves results in an edge which can be scanned in the direction normal to the longitudinal center plane of the flat key. The invention further relates to a lock cylinder for such a flat key. The protection of life, privacy and property are paramount. Therefore, a lock and a key are of particular importance. In locking systems, access areas are defined and implemented by assigning each asset key to one or more locks. This assignment or the exclusion of key and lock with respect to the lock function is u.a. in locking systems based on lock cylinders with flat keys. achieved by the cross-sectional profile of the key and the cross section of the keyway. Only when the contour of a key channel cross-section corresponds to or envelops a flat key cross-section does the key fit into the lock. As soon as the contour of the flat key cross section intersects that of the key channel cross section, the key has no blocking authorization with regard to the abovementioned lock cylinder.

Of course, this association between the key and lock cylinder on the profile -also the cross section of key, especially flat key, and key channel of the lock cylinder - even for the single cylinder and the single key, not directly

Part of a locking system is.

The security requirement is equivalent if a key can not be copied easily. A replacement key can be procured from the authorized person by means of security notes and strict identity checks. If key blanks are commercially available, a key service with a copy milling device can produce a spare key easily by making teeth on the key-chest. If a Kopierfräseinrichtung is also able to scan a cross-sectional profile on the flat sides of an original key and appropriate milling tools are available, a spare key can also be machined from a metal plate machined. So far, if by restricting the free accessibility in the market, the production of spare keys for locked key profiles for lack of a corresponding blank was not possible, so today the technical possibilities for key services already exist to make copies of a key both in terms of the teeth and in terms of profile , The scanning of a key profile is done mechanically or visually from the side. The result of this lateral scan is followed by the insertion or feed of one or more cutters for the production of U-shaped, V-shaped or rectangular grooves. By tilting the key blank, grooves may also be inclined to the centerline of the profile cross-section, e.g. as undercut grooves, are produced.

The problem is that the locksmiths usually the cross-section of the key something " smaller " make, i. Make all grooves slightly wider and deeper so that the key can be safely inserted into the keyway. As a result, it often happens that a key can also be inserted into locks for which it is not intended (so-called cross locks). This often invalidates a whole locking system.

In EP 1362153 B, a profile system for cross-sectional training of flat keys with substantially flat and approximately parallel flat sides as well as corresponding key channels in lock cylinders has been proposed, which is a working out of the profile in a work process with a keyfill milling device of the type that could be used in key services was not possible. This was achieved in flat keys with substantially flat and approximately parallel flat sides and corresponding key channels in that of at least one groove, in particular the guide profile, at least one further groove went out as a branching and that the Einstechrichtungen of groove and Abzweigut were different and, for example, 60 ° diverged. Due to the lateral scanning of the profile grooves of an original key during copying, the branching groove was not or only partially recorded. It would have had to be made by rewinding the blank and rescanning the original. The reclamping for a deviating to the original Einstechrichtung a profile angle of the center line of the profile groove inevitably leads to lateral displacements, so that a branching or laterally outgoing from a groove further groove was neither dimensionally and functionally still inexpensive to produce.

An inexpensive and accurate production was possible in practice only in the lock factory, which had profiled broaching machines and large milling centers, with Umspannfehler did not occur, as error-causing separate operations with re-measuring a starting position were not required.

Nevertheless, it is in principle (although associated with great effort) possible to copy such keys, if only the grooves significantly larger (wider and deeper) executes. According to EP 1362153 B, it is provided that other grooves are provided in the immediate vicinity, so that the key loses its stability as a result of too generous routing away from the ground; i.e. the copy service can not simply mill such a large groove that this groove of the copied key envelopes the groove and the branch groove of the original key. However, the copy service can install the groove and the branch groove - slightly larger - without the key losing its stability or blocking capability.

From the AT 500 638 B is known to provide a sensing pin in the lock, which determines at the undercut groove, whether it is actually undercut or whether it was simply replaced by a correspondingly wider V-groove. A disadvantage of this scanning pin was that it only worked in one direction. In other words, if the lock was installed incorrectly, then it could be unlocked with an illegally copied key, but not locked afterwards. But even with correct installation, it was problematic if the illegally copied key was used by authorized persons; they could lock themselves up and no longer unlock the room or apartment.

Furthermore, the security gain was low, because only the presence of the undercut was scanned, but not the exact execution of groove and Abzweignut.

It is an object of the present invention to provide a flat key, in which a copying is even more difficult than the keys according to EP 1362153 B and the AT 500638 B.

According to the invention this is achieved in that of the two overlapping grooves are both undercut, in opposite directions, and that through these undercuts in at least one groove, the center of the groove base - seen in the direction normal to the longitudinal center plane of the key - is covered.

The idea behind this is the following: If the groove bottom is at least partially hidden, it is particularly difficult to determine the exact data of the groove (depth, width, angle, position). The edge, which results from the intersection of the two grooves, can be scanned in the lock. But this edge can not be made directly from the locksmith, but results just by the intersection of the two grooves. If the data from at least one groove is not exactly detectable, this edge is not in the designated place and the key does not lock. Because of this edge, which can be scanned, a trapezoidal groove can not simply be applied to copy milling, which envelops both grooves of the original key. By scanning the edge in the lock, it is imperative that both grooves are made correctly so that the key locks.

It is particularly advantageous if the two undercut angles are different. In this case, namely a re-milling with a trapezoidal cutter also causes a different formation of at least one groove flank. In addition, this can not be closed from the angle of a groove on the angle of the other groove, which would facilitate the measurement of the original key.

The measurement of the grooves is particularly difficult when at least one groove and the transition from the groove flank to the groove bottom through the undercut - seen in the direction normal to the longitudinal center plane of the key - is covered.

In view of a guarantee that the execution of the invention in any case even with locking systems for safety reasons always (ie in all keys, even the most minor key) is present, it is expedient if the two grooves are provided as a guide profile elements. The guide profile is formed within a locking system with each key, so thus the desired level of security is given in any case.

It is advantageous if at least one of the two grooves overlaps with a Führungsprofilnut on the opposite side of the flat key. This is known to complicate the introduction of Nachsperrvorrichtungen.

Finally, it is expedient if at least one Trognut is provided between the overlapping grooves and the key chest, wherein the groove flank of the Trognut an angle α less than 90 °, preferably between 30 ° and 45 °, with the median plane of the flat key includes and other side edge of the Trognut an angle ß between 93 ° and 97 ° with the center plane of the flat key includes. The features known from AT 500 638 B prevent sharp edges on the key.

A lock cylinder for a flat key of the type described above is equipped with a cylinder housing and at least one rotatably disposed in a bore of the cylinder housing cylinder core, which has a profiled keyway, and with divided into core and housing pins tumbler pins in the holes the cylinder housing and the cylinder core are spring-loaded against the end face of the key bit towards the key back. The formation of the keyway is the same as the key: The profiling of the keyway has two, from a common root on a keyway flank outgoing, V-shaped diverging ribs each with acute outer angle to the keyway flank, which are complementary to the two overlapping grooves of the flat key. According to the invention, a sensing element is further provided in at least one cylinder core, which scans the edge, which results from the intersection of the two grooves of the flat key and which may also be formed as a flattening and blocked at too low lying edge or flattening the lock cylinder.

This locks a key neither too high nor too low-lying edge: If the edge is too high, the key does not fit in the key channel, it is too deep, the lock is blocked by the sensing element.

Preferably, a sensing element is further provided which scans the presence of the undercut of a groove and blocks the lock cylinder in the absence of the undercut. This prevents that an undercut groove is replaced by a correspondingly larger, V-shaped groove.

The respective sensing elements are approximately radially displaceable or rotatable within the cylinder core and attach to the shoulder of the undercut of the keyway or to the edge or flattening between the v-shaped diverging grooves in the key. With the correct key, then, a region of the scanning element lies in such a way that it fills the recess in the cylinder core on the lateral surface and a housing pin can slide over the filled recess during the blocking process over the filled recess. A wrong key fits either not at all in the keyway or the housing pin in the plane in which the sensing element is, snaps into the then open recess in the cylinder core, so that this not further rotated (but probably turned back) can be.

Embodiments of the subject invention are illustrated in the drawings. FIG. 1 shows a key from the side; FIG. FIG. 2 shows the contour of a section along the line II-II in FIG. 1 with a first profile according to the invention; FIG. 3 shows the contour of a section analogous to FIG. 2 with another profile according to the invention; 4 shows a cylinder core with a key inserted according to FIGS. 1 and 2 and FIGS. 5 and 6 show sections along the planes V and VI in FIG. 4.

A key 1 (flat key) of a locking system has a profile in cross-section, in particular a guide profile with grooves 2, 3. A guide profile fulfills the task of positioning the key in the keyway. The two grooves 2, 3 overlap (cover) each other. The piercing direction X for producing the groove 2 and the piercing direction Χί for producing the groove 3 are different. Thus one can not close from one piercing direction to the other piercing direction, which would facilitate measuring the key.

It is essential that the grooves 2, 3 are undercut, in opposite directions. (That is, if one draws the angle X and Χί between the piercing direction and the longitudinal center plane of the key so that they are smaller than 90 °, then the angle X is measured in the direction of the key back, while the angle Xi is measured towards the key bit. ) Thus, the center 4 of the groove 2 (and thus the depth) is not determined by scanning normal to the longitudinal center plane 6 of the key, which makes determining the exact data of the groove 2 (ie width, depth, position and angle X) much more difficult. In this case not even the transition region 4 'from the flank to the groove bottom is detectable.

Due to the resulting inaccuracy in a subsequent measurement, it is almost impossible that in a copy of the key, the edge 5, which results from the intersection of the two grooves 2, 3 and can not be milled directly, the correct Distance d from the edge 7 of the key 1 has.

In Fig. 2 further Trognuten 40 and 41 between the overlapping grooves 2, 3 and the toothed key breast (the key bit) are shown by dashed lines. These are part of a variation profile that is created by passing or removing individual grooves in the system or represented grid of all these possibly also overlapping trough grooves 40 and 41, respectively. Due to the aforementioned angular formation of the flutes, a surface structure can be achieved without disturbing sharp edges. Fig. 2 also shows the Führungsprofilnut 42, the groove bottom overlaps with the groove bottom of the groove 2, so that the keyway prevents the insertion of a wafer for scanning purposes in complementary complementary training. This overlapping here means exceeding a plane parallel to the longitudinal center plane 6 tangential plane at a groove 2 by another opposing groove 42nd

Fig. 3 shows a key 1 ', which in addition to the grooves 2 and 3 also grooves 2' and 3 ', which have analogous geometric properties as the grooves 2 and 3. The edge is flattened within the grooves 2 'and 3' to a support surface 5 '.

4, the corresponding cylinder core 9 is shown with a key 1 according to FIGS. 1 and 2 or 3. Essential here are the two scanning elements 11 and 12, which can be seen more clearly in FIGS. 5 and 6.

The two sensing elements 11 and 12 are guided in a corresponding recess of the cylinder core 9 so that they move normal to the longitudinal center plane of the key 1, but can not tilt significantly. In both sensing elements 11 and 12 one end is free (the lower end, as seen in Figs. 5 and 6), the other end is on 4/11

Claims (9)

Austrian Patent Office AT 511 096 B1 2012-09-15 key 1, namely the scanning element 11 at the edge 5 (bearing surface 5 ') and the scanning element 12 at the undercut 8. In the region of these sensing elements 11 and 12 are on the outside of the cylinder core recesses 21, 22, 31, 32 which slowly become deeper from the outer sides of the scanning elements 11, 12 and terminate in the middle region of the scanning elements 11, 12 in a step 21 ', 22', 31 ', 32'. These depressions lie in parallel cross-sectional planes in which pin tumblers are provided in the cylinder housing. If the cylinder core is rotated so far that the housing pins reach the area of these recesses, then they slide with a correct key on the sensing elements 11 and 12 via the respective stage 21 ', 22', 31 'and 32' away , If the key is not correct, i. if the edge 5 or the support surface 5 'is too deep or the undercut 8 is not present, the sensing elements 11, 12, the wells free. The springs of the housing pins press the housing pins into the respective recess 21, 22, 31 or 32 so that the housing pins rest against the respective step 21 ', 22', 31 'or 32' and the cylinder core 9 can no longer be rotated , However, since the recesses become shallower in the opposite direction, the cylinder core 9 can be turned back and the non-matching key removed. This works in both directions, even with double-lock cylinders built in the other way around. Of particular advantage of this type of scanning is that the cylinder housing does not need to be changed, all necessary features can be realized on the cylinder core 9. If the grooves 2, 3 are too weak in a key copy, i. too narrow or too shallow, then the key can not be introduced into the keyway because of collision with the corresponding ribs in the keyway of the cylinder core 9. It should be noted that it is not necessary in practice to carry out the additional scanning with the sensing elements 11 and 12 in all locks a locking system, since the locksmith can not know whether they are present or not. A locksmith does not copy keys if he does not know if the key locks or not. A spare key that was nevertheless produced could possibly block one or the other door in systems, but not, for example, main entrances. Thus, such a " copy " pointless. 1. flat key (1, T) for a lock cylinder, in particular locking systems, with substantially flat and approximately parallel key flat sides, a key back and this opposite, toothed on the front side key bit for positioning split into core and housing pins tumbler pins, the in corresponding key channels of cylinder cores are spring-loaded against the front side of the key bit towards the key back, being provided in the flat sides of the flat key grooves as variation profile elements and as a guide profile elements, wherein at least two grooves (2, 3) overlap one side of the flat key whose Einstechrichtung (X, is different, so that by the intersection of the two grooves (2, 3) results in an edge (5) which is scanned in the direction normal to the longitudinal center plane (6) of the flat key (1) characterized thereby t that of the two overlapping grooves (2, 3) are both undercut, in opposite directions, and that by these undercuts (8) at least one groove (2) the center (4) of the groove bottom - in the direction normal to the longitudinal center plane ( 6) of the key - is hidden. 2. flat key according to claim 1, characterized in that the two undercut angles (X, Xi) are different in size. 5/11 Austrian Patent Office AT 511 096 B1 2012-09-15 3. flat key according to claim 1 or 2, characterized in that at least one groove (2) and the transition (4 ') of the groove flank to the groove bottom through the undercut (8) - in the direction normal to the longitudinal center plane of the key (1, 1 ') - is hidden. 4. flat key (1) according to one of claims 1 to 3, characterized in that the two grooves (2, 3) are provided as guide profile elements. 5. flat key according to claim 4, characterized in that at least one of the two grooves (2, 3) with a Führungsprofilnut (42) overlaps on the opposite side of the flat key (1, 1 '). 6. Flat key according to one of claims 1-5, characterized in that between the grooves (2, 3) and the key-chest at least one Trognut (40, 41) is provided, wherein the groove flank of the Trognut (40, 41) an angle α smaller than 90 °, preferably between 30 ° and 45 °, with the median plane of the flat key (1) encloses and the other side edge of the Trognut (40, 41) forms an angle ß between 93 ° and 97 ° with the median plane of the flat key (1) , 7. lock cylinder for a flat key according to one of claims 1 to 6, with a cylinder housing and at least one rotatably disposed in a bore of the cylinder housing cylinder core having a profiled keyway, and divided into core and housing pins tumbler pins in the bores of the cylinder housing and the cylinder core are spring loaded against the end face of the key bit in the direction of the key back, characterized in that the profiling of the key channel two from a common root on a key channel edge outgoing, V-shaped diverging ribs each having acute outer angle to the key channel flank, which to the both overlapping grooves (2, 2, 2 ', 3') of the flat key (1, 1 ') are complementary. 8. lock cylinder according to claim 7, characterized in that in at least one cylinder core, a sensing element (11) is provided, which is the edge (5) by the intersection of the two grooves (2, 3, 2 ', 3') of the flat key (1, T) and which can also be formed as a flattening (5 '), scans and blocked at too low lying edge (5) or flattening (5') the lock cylinder. 9. lock cylinder according to claims 7 or 8, characterized in that in at least one cylinder core a sensing element (12) is provided, which scans the presence of the undercut (8) of a groove (2) and in the absence of the undercut (8) the lock cylinder blocked. For this 5 sheets drawings 6/11