EP0159494B1 - Cylinder lock and flat key therefor - Google Patents

Abstract

1. Cylinder lock with a core (3) rotatably mounted in the housing (1) in particular of a profiled cylinder, having a profiled key channel (5) for receiving a correspondingly profiled flat key (6) and several radially displaceable core pins (4) actuatable from incisions (6'') present at the front, which cooperate with correspondingly positioned spring-loaded housing pins (2) and with an axis-parallel blocking strip (12) mounted in a radially displaceable manner in the core (3) and engaging in an internal circumferential recess (15) in the housing, which is blocked by control elements (8) moving against the action of a spring in a plane running transversely of the cylinder axis, which project laterally into the key channel (5) and can be entered by the flat key (6), or is released for its radial entry movement into the core, characterized in that the control elements are formed as two-armed control levers (8) rockably mounted on a common pivot pin (10) running parallel to the key channel (5), the ends of which (8**IV) facing away from the key channel (5) cooperate with the blocking strip (12), where at least one of the control levers (8) is formed as the blocking strip (12) of counter-control levers (8a) exerting a blocking or releasing action in the opposite direction.

Description

The invention relates to a locking cylinder with a core rotatably mounted in the housing, in particular a profile cylinder, which has a profiled key channel for receiving a correspondingly profiled flat key and a plurality of radially displaceable core pins which can be acted upon by cuts on the chest side thereof and which interact with correspondingly arranged spring-loaded housing pins. and with a radially displaceable core, which engages in an inner circumferential recess in the housing and runs parallel to the axis, blocking the control elements which are movable in a plane transverse to the cylinder axis counter to spring action and protrude laterally into the key channel and can be acted upon by the flat key, or for their radial entry movement to be released into the core. Furthermore, the invention relates to a flat key suitable for this locking cylinder.

A lock cylinder of the aforementioned type is known from DE-A-30 14183, Fig. 13. Such locking cylinders with their locking pins in addition to the tumbler pins, which can also be moved radially via the control elements to be actuated by the flat key, significantly increase the security against unlocking. The axially continuous and with the corresponding inner circumferential recess in the housing engaging locking bar against other, z. B. according to DE-A29 47 402 known lock cylinders with several each of the individual controls associated with each radially displaceable individual short locking cylinders the advantage that the locking bar is able to absorb much greater torsional forces and therefore offers better protection against rotation of the cylinder core when attempted by unauthorized persons. In the known locking cylinder with a continuous locking bar, the control elements located between it and the key channel consist of spring-loaded scanning bolts, which are accommodated in corresponding stepped bores in the core and are provided with a beveled constriction on both sides, into which a circular cylindrical cross-section is obtained when the matching position is brought about by the appropriate flat key possessing locking bar can occur when the cylinder core is rotated. However, this requires a still relatively stiff design of the control elements actuating the locking bar, because for their adjustment not only the sliding friction force of the scanning bolts, but also the static friction between their constrictions and the locking bar must be overcome. The insertion of the flat key is also made more difficult by the corresponding return springs of the locking bolts, especially since the latter have a comparatively wide adjustment stroke. After all, this known locking cylinder, with its scanning bolts either blocking or releasing the continuous control bar, offers, in addition to its conventional pin tumblers, an additional variation option, which is particularly desirable for locking systems.

Such an additional possibility of variation also exists in a locking cylinder according to DE-B-20 03 059, the cylinder core of which contains, in addition to the core pins interacting with housing pins, additional locking pins which can be displaced transversely to the inserted flat key and which have thickened hemispherical heads in corresponding recesses in the Protrude inside the housing and thereby block the core additionally. In contrast, these locking pins can enter these recesses when a suitable key is inserted, which is provided with dome-shaped recesses in profile thickenings on both sides, and thereby enable the core rotation. However, since the locking pins are acted upon directly by the flat key here, they can easily leave pressure marks in the key when the wrong key is used when the core is twisted, whereby their positions in the cylinder are revealed and the wrong key can be corrected accordingly. In addition, these additional locking pins fail if the false key is milled flat in the locking pin area or if a false key with a correspondingly narrower shaft profile is used from the outset. Otherwise, the dome-shaped cutouts intended for the locking pins are already in the transition area to the key incisions, which can easily lead to correspondingly disruptive overlaps.

The last-mentioned danger does not exist in a lock cylinder of a similar design according to DE-A-24 11 362, since here the additional locking pins are moved more to the outside, that is to say closer to the peripheral section of the key channel. However, in order to arrange these additional locking pins on the key, there are additional longitudinal ribs projecting laterally beyond its normal profile, which are very disruptive when the key is used in practice. In addition, these projecting additional longitudinal ribs on the key can also be easily removed, as a result of which the additional effect of the locking pins would be lost again.

The invention is based on the object to improve and perfect a lock cylinder of the type mentioned in that he solid, failure-prone and wear-resistant design has even greater security against unauthorized unlocking and key falsification with increased variation options and, above all, enables easier actuation or twisting of the cylinder core when using the appropriate flat key. It should also be ensured that such locking cylinders can easily be retrofitted in existing conventional locking systems in order to expand the latter accordingly. This object is achieved on the basis of a lock cylinder of the type in question according to the invention in that the control elements are designed as two-armed control levers which are tiltably mounted on a common axle bolt running parallel to the key channel and whose ends facing away from the key channel interact with the locking bar, at least one of which the control lever is designed as a counter-blocking lever that blocks or releases the blocking strip in opposite directions. The control levers lying one behind the other in the key channel direction and bearing on the correspondingly running axle pin with low friction can be pivoted comparatively easily into their position releasing the continuous locking bar for the rotation of the core by means of the suitable flat key. There is also the advantageous possibility of achieving a favorable stroke transmission ratio by corresponding arrangement of the axle bolt in relation to the opposite control ends of the control levers, in which a correspondingly larger blocking or release stroke on the other is achieved with only small adjustment strokes on the control lever ends facing the flat key introduced End of the control lever can be achieved. For this purpose, the distance effective for the tilting movement of the control lever between the axle bolt and the ends of the control lever projecting into the key channel is advantageously to be selected shorter than the distance between their other ends and the axle bolt. It is also essential for the invention that at least one of the control levers is designed as a counter-control lever, which, like the control levers, cannot be brought into the tilting position releasing the locking bars by a correspondingly located lateral recess in the flat key, but rather by a position in the key located at a corresponding point , consciously not existing lateral recess must be tilted in the opposite direction. This brings an additional unlock protection against possible flat grinding of the key at its longitudinal center containing the side depressions. Finally, the tiltable control elements block the core even in its rest position when the flat key is inserted, which is not provided with proper lateral recesses, i.e. not only after an initial core rotation, such as in the case of the locking cylinder according to DE-B-2 059 523, which otherwise necessitates changing of the lock bit and the associated disadvantages, e.g. B. the freewheel in the mortise lock and the expenditure of greater care when installing the cylinder are eliminated.

According to a further feature of the invention, the control levers are provided at their ends projecting into the key channel with control lugs which can be varied in the axial direction and have different profiles. As a result, the control levers provide an additional third variation option in addition to the two other variation options provided by the tumbler pins on the one hand and the profiling of the key channel on the other.

The control levers are advantageously accommodated in segment-milled receiving slots in the cylinder core and are themselves designed in the manner of a disk segment, with their curved rear surface facing the cylinder housing wall and with their chest surface extending straight up to the projecting control nose, facing the key channel, a correspondingly arranged bearing hole for the through axle bolt and underneath have a recess for a compression spring located therein, which is supported on the bottom of the receiving slot of the cylinder core, and are provided at their lower end with a control edge for the locking bar, which has a radially projecting blocking cam. While the radially projecting blocking cam is on the outside of the control levers, it is on the inside of the counter-control levers.

The flat key belonging to the lock cylinder designed according to the invention is from the z. B. by the already mentioned DE-B-20 03 059 known genre insofar as its shaft is provided with profile ribs and grooves present on both sides, has a continuously broad guide back and incisions on the opposite chest side for arranging the cylinder core pins and laterally located Has recesses for engaging additional locking elements of the cylinder core. According to the invention, the lateral depressions consist of circular segment-shaped millings which are concentric to an axis extending parallel to the key axis and which lie outside the incision area near the back of the key. This ensures that the milled keyways cooperating with the control levers of the locking cylinder can neither be falsified by the incisions thereof nor require a modification of the broad, smoothly running guide back of the key. In addition, these side millings can also be made in the axial direction have differently designed and / or shifted profile, which results in corresponding additional variation possibilities.

The lateral millings are advantageously provided in the profile hump adjacent to the guide groove of the key, which is opposite a profile trough on the other side of the key. In this way, the flat key is deliberately weakened so far that it is still of sufficient strength on the one hand due to the normal profile thick points remaining between the cutouts, but on the other hand it would be too thin and thus unusable in the event of any longitudinal surface grinding in this cutout area.

Finally, according to a further embodiment variant of the invention, the counter-control lever or levers can also be provided with a built-in permanent magnet at their control nose end, the associated flat key containing one or more built-in permanent magnets at the corresponding points instead of the milled grooves otherwise present there, each corresponding to the Cylinder core on its counter-control levers located opposite magnets are poled opposite. In this way, when the flat key is inserted into the key channel of the locking cylinder, there is a corresponding repulsive tilting movement of the counter-control lever, which is thereby able to release the locking bar which would otherwise be blocked by it.

• Fig. 1 und 2 einen in Höhe eines Steuerhebels verlaufenden Querschnitt durch einen Profilschließzylinder mit in Freigabe- bzw. Blokkierstellung befindlichem Steuerhebel,
• Fig. 3 und 4 in Höhe eines Gegensteuerhebels verlaufende Querschnitte durch den gleichen Schließzylinder,
• Fig. 5 eine Teilansicht auf den zugehörigen profilierten Flachschlüssel,
• Fig. 6 einen Teilschnitt nach der Linie VI - VI der Fig. 1 und
• Fig. 7 und 8 zwei entsprechende Querschnittsdarstellungen durch einen mit einem oder mehreren eingebauten Permanentmagneten versehenen Schließzylinder bei eingeführtem Flachschlüssel in der Freigabe- bzw. Blockierstellung des Gegensteuerhebels.

Several exemplary embodiments according to the invention are shown in the drawing. Show:

• 1 and 2 a cross-section running at the level of a control lever through a profile lock cylinder with the control lever in the release or blocking position,
• 3 and 4 in the amount of a counter-control lever cross sections through the same lock cylinder,
• 5 is a partial view of the associated profiled flat key,
• Fig. 6 is a partial section along the line VI - VI of Fig. 1 and
• 7 and 8 two corresponding cross-sectional representations through a locking cylinder provided with one or more built-in permanent magnets with an inserted flat key in the release or blocking position of the counter-control lever.

The profile lock cylinder shown in FIGS. 1 to 4 and 6 has a cylinder housing 1 with tumbler pins 2 which are displaceably mounted in its profile web 1 'in corresponding bores 1' and are under spring tension 2. The core 3 is rotatably mounted in the housing 1 radially running bores 3 ', the core pins 4, which cooperate with the housing pins 2, are displaceably mounted. In the extension of the core pin bores 3', the profiled key channel 5 is provided in the core 3, which is used to insert the correspondingly profiled flat key 6, which with its conventionally wide-area, continuously smooth running, rounded back 6 'finds a well-guided receptacle in the correspondingly profiled, non-narrowed peripheral section 5' of the key channel , 4 can be classified so that they come with their mutual contact into the separating cylinder surface 7 between the core 3 and the housing 1, whereby the core 3 would lose its blockage in this regard.

However, there is an additional blocking of the core in the form of a plurality of control levers 8 lying one behind the other in its longitudinal direction, which are accommodated in receiving slots 3 ″ of the core 3 which are milled out in segment form and are themselves designed in the manner of a segment of a disc a common axle bolt 10 which runs parallel to the key channel 5. They protrude with their upper ends, which are designed as control lugs 8 ', into the key channel 5 near its undiminished peripheral section 5', here directly below the relevant guide rib 5 "into the key channel 1, in which they are held by the compression spring 11 "located in its recess 8", which is supported on the bottom 3 '"of the receiving slot 3". The control levers 8 of the cylinder housing wall rest with their back surface facing while ih right up to the control lugs 8 'rectilinear breast surfaces the key channel 5 or the slot bottom 3 "' are facing. The receiving slots 3 "are offset from the core pins 4, so that the latter can be supported when the core 3 is rotated on the partition walls 14" between the slots 3 ".

At their lower ends, the control levers 8 are provided with a control edge 8 ′ ″ which merges outwards into the radially projecting blocking cams 8 ^1v . The control levers 8 work together with a common axially parallel locking bar 12, which in substantially rectangular cutouts 13 in the partition walls 14 of the core 3 are supported so as to be radially displaceable to a limited extent. This locking bar 12 normally protrudes into the curved recess in the inner wall of the housing 1 and correspondingly parallel to the axis of the recess 15. For manufacturing reasons in the case of profile double cylinders symmetrically to the locking recess 15, a further appropriately designed locking recess 15 'is provided on the opposite side of the housing 1.

When the suitable key 6 has been removed or also inserted, the control levers 8 assume the rotational position shown in FIG. 1, in which they protrude with their control lugs 8 'into the key channel or into corresponding lateral millings 6 "' located in the key 6 ' suitable key, which has correctly arranged the tumbler pins 2, 4 with its incisions 6 ″ on the chest, the core 3 can then be rotated, the locking bar 12 being able to radially escape from the locking recess 15 in the housing 1. If, on the other hand, as FIG. 2 shows, a wrong flat key 6a, which is not provided with a correspondingly arranged lateral milling 6 "', is inserted, which would indeed be provided with matching incisions 6" which correctly position the pins 2, 4, the core could nevertheless be used 3 are not rotated, since the locking bar 12 is then blocked by the correspondingly tilted control lever 8 and its locking cams 8 ^IV lying behind it against radial evasion.

In order to prevent the locking cylinder from being opened by a false key provided with suitable incisions and profiles, but continuously flat ground in the area of its lateral cutouts 6 ″, at least one of the control levers described above is designed as a counter control lever 8a. counter control levers 8a shown 3 and 4 differs from that shown in Fig. 1 and 2 illustrated control lever 8 only in that its situated at the lower end blocking cam 8 ^1v is not outside but inside. this has the consequence that this blocking cam 8 ^IV wherein in Fig. 4 shown, with the wrong lateral milled key 6b lies behind the locking bar 12, on the other hand with properly procured, at the relevant side position 6 ^IV deliberately not provided with a milled key 6 and the resulting opposite tilting movement of the counter control lever 8a in 3 shown in FIG. the locking bar 12 releases position.

5 and 6 in particular, the control levers 8 on their control lugs 8 ′ projecting into the key channel and consequently interacting with the inserted key 6 can be correspondingly differently profiled in the axial direction, the lateral milled portions 6 ′ ″ in the key 6 being in 5 and 6, this profile can be varied or shifted accordingly. In any case, the side depressions 6 "'consist of Key 6 made of circular segment-shaped millings which run concentrically to an axis extending parallel to the key axis and which lie outside the incision area 6 ″ in the vicinity of the key back 6 ′. The key 6 is otherwise with profile ribs 6 ^v or profile grooves 6 ^V1 to be varied provided the profiling of the key channel 5 e speak. The lateral millings 6 "'advantageously lie in the profile boss 6 ^VIII adjacent to the guide groove 6v" of the key, which is opposite a profile recess 6 ^IX on the other key side (FIG. 1). The resulting weakening of the key 6 at these milling points 6 ″ 'takes place for the reasons set out earlier.

In the embodiment shown in FIGS. 7 and 8, a permanent magnet 16 is installed on the counter control lever 8b at the control nose end thereof, which may have the north-south polarity indicated by the letters S, N. At a corresponding point in the key 6c there is also a permanent magnet 17, but of opposite polarity. As a result, when the appropriate key 6c is inserted, the counter control lever 8b is pushed off and tilted into the release position shown in FIG. 7, in which its blocking cam 8 ^IV releases the locking bar 12 for its radial evasive movement when the core 3 is rotated. If, on the other hand, a false key 6d which is provided with suitable incisions 6 "but does not have a permanent magnet 17 located at the appropriate location is inserted into the key channel, the counter-control lever 8b remains in the rotational position shown in FIG. 8, in which it with its blocking cam 8 ^IV Blocking bar 12 and thus also blocked the core 3.

Claims (11)

1. Cylinder lock with a core (3) rotatably mounted in the housing (1) in particular of a profiled cylinder, having a profiled key channel (5) for receiving a correspondingly profiled flat key (6) and several radially displaceable core pins (4) actuatable from incisions (6") present at the front, which cooperate with correspondingly positioned spring-loaded housing pins (2) and with an axis-parallel blocking strip (12) mounted in a radially displaceable manner in the core (3) and engaging in an internal circumferential recess (15) in the housing, which is blocked by control elements (8) moving against the action of a spring in a plane running transversely of the cylinder axis, which project laterally into the key channel (5) and can be entered by the flat key (6), or is released for its radial entry movement into the core, characterised in that the control elements are formed as two-armed control levers (8) rockably mounted on a common pivot pin (10) running parallel to the key channel (5), the ends of which (8^IV) facing away from the key channel (5) cooperate with the blocking strip (12), where at least one of the control levers (8) is formed as the blocking strip (12) of counter-control levers (8a) exerting a blocking or releasing action in the opposite direction.

2. A cylinder lock according to claim 1, characterised in that the control levers (8) are provided, at their ends projecting into the key channel (5), with correspondingly differently profiled control lugs (8') which vary in the axial direction.

3. Cylinder lock according to claim 1 or 2, characterized in that the control levers (8) are housed in segment-shaped milled receiver slots (3") of the cylinder core (3) and themselves have a disc-segment structure, are positioned with their curved rear surface facing the cylinder housing wall and with their front surface, which runs straight against the upwardly projecting control lug (8'), facing the key channel (5), have an essentially centrally-arranged bore (9) for the penetrating pivot pin (10) and a lower recess (8") for a compression spring (11) contained in it and supported on the bottom (3"') of the receiver slot (3") of the cylinder core (3) and are provided at their lower end with a control edge (8"') for the blocking strip (12) having a radially projecting blocking cam (8'V).

4. Cylinder lock according to claim 3, characterised in that the radially-projecting blocking cam (8^IV) is provided on the outside, in the case of the control levers (8), but on the inside in the case of the counter-control lever or levers (8a).

5. Cylinder lock according to any of claims 1 to 4, characterised in that the counter-control lever or levers (8a) are provided at their control lug end with a built-in permanent magnet (16).

6. Cylinder lock according to claim 3, characterised in that the receiver slots (3") for the disc-segment-shaped control levers (8) present in the cylinder core (3) are mounted offset in relation to the core pins (4).

7. Flat key for cylinder locks according to any of claims 1 to 6, the shaft of which is provided with profiled ribs and grooves on both ends, has a throughgoing wide-surfaced smooth-running rear guide side (6') and, on its opposite front side, incisions (6") for insertion of the cylinder core pins and has laterally-arranged recesses (6"') for additional locking elements of the cylinder core which engage therein, characterised in that the lateral recesses consist of circular segment-shaped milled cuts (6"'), running concentrically with an axis which extends parallel to the axis of the key, the milled cuts being located outside the area of the incision (6") in the vicinity of the back of the key (6').

8. Cylinder lock according to claim 1, characterised in that the effective distance for the rocking movement of the control levers (8) between the pivot bolt (10) and the ends (8') of the control levers (8), projecting into the key channel (5), is shorter than the distance between their other ends (8^IV) and the pivot bolt (10).

9. Flat key according to claim 7, characterised in that the lateral milled cuts (6"') have a shaped and/or offset profile which varies in the axial direction.

10. Flat key according to claim 7 or 8, characterised in that the lateral milled cuts (6"') are provided in the profiled bulge (6^VIII) adjacent the guide groove (6^VII) of the key (6), the profiled bulge being positioned opposite a profiled depression (6^IX) on the other side of the key.

11. Flat key according to any of claims 7 to 9, characterised in that it contains, in place of one or more milled cuts (6"'), one or more built-in permanent magnets (17), which are of opposite polarity in each case to the permanent magnets (16) positioned in the cylinder bore (3) at a suitable point in its counter-control levers (8b).

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