EP0632176B1 - Cylindrical lock - Google Patents

Abstract

The lock cylinder has a housing (1) with a reception bore (7) for the lock cylinder core (11) which is rotated about its cylinder axis (9), with a key slot extending along the latter. The key slot has a series of retaining elements (21) preventing the rotation of the cylinder core relative to the housing, released by the inserted key. The outer mantle of the cylinder core has reception pockets (29) containing armouring plates (33), lying on either side of the key slot. Pref. the pockets are provided by slots normal to the cylinder axis, each armouring plate having a contour which is a circular section and retained by a hook (39) and a cooperating stop shoulder (47).

Description

The invention relates to a locking cylinder and in particular a locking cylinder with at least one anti-drilling element inserted in its cylinder core.

Conventional locking cylinders have a cylinder core which can be rotated about its cylinder axis in a core receiving bore of a housing and which contains a key channel extending in the direction of the cylinder axis and is blocked relative to the housing by a plurality of tumbler elements arranged one behind the other in at least one row along the key channel. The tumbler elements, which are usually spring-loaded tumbler pin pairs divided in a tangential plane to the cylinder core, are unlocked by means of a key inserted into the key channel.

In order to overcome such a locking cylinder by force, an attempt is made to drill a hole in the cylinder core along the tumbler pin row in order to destroy the tumbler pins and to be able to pull the core. Alternatively, an attempt is made to turn a high-strength, self-tapping screw into the key channel, on which the cylinder core is then pulled out of the core receiving hole while the tumbler pins are sheared off.

In order to prevent the cylinder core from being drilled out, it is known from British Patent 1,040,276 to reinforce the cylinder core by means of hardened steel pins inserted into bores on both sides of the key channel. The steel pins are arranged approximately in the middle of the tumbler pin row.

It is also from the UK as a drill protection Patent 1 545 294 and German utility model 1 978 126 known to arrange a reinforcing plate made of hardened steel or hard metal surrounding the insertion opening of the key channel in the region of the insertion end of the cylinder core. The reinforcement plate sits in a pocket in the cylinder core.

From AT-B-389 344 it is known to insert two hard metal pins into bores of the cylinder core between the plug-in end of the cylinder core and the pair of tumbler pins that follows as the first. The distance between the hard metal pins is approximately the same or only slightly larger than the width of the key channel. The carbide pins not only form a drill protection, but also ensure that when trying to screw a core pulling screw into the key channel, the thread of this screw is processed on the carbide pins, i.e. the screw is destroyed before it digs into the softer material of the cylinder core can.

From DE-C-36 43 188 it is also known to mount radially pivotable crescent-shaped locking members on both sides of the key channel in axially normal slots of the cylinder core on axis pins running parallel to the cylinder axis. The locking members are assigned crescent-shaped grooves in the housing bore receiving the cylinder core. When a core pulling screw is screwed into the key channel of the cylinder core, the locking elements are pushed outwards into the grooves in the core receiving bore and, in addition to the tumbler pins, lock the cylinder core in the housing.

The holes and pockets provided for receiving the reinforcing elements in the cylinder core weaken the cylinder core so that it can partially tear off during pull-out attempts, with the result that the rest of the core is unprotected. About that In addition, conventional reinforcement elements offer no protection against milling out the entire front end of the cylinder core by means of a milling tool up to the then freely removable reinforcement elements.

It is an object of the invention to provide a locking cylinder which is better protected than previously against drilling and / or core pulling.

• ein Gehäuse,
• ein in einer Kernaufnahmebohrung des Gehäuses um seine Zylinderachse drehbaren Zylinderkern mit einem ausgehend von einem Einsteck-Stirnende des Zylinderkerns in Richtung der Zylinderachse sich erstreckenden Schlüsselkanal,
• eine Vielzahl in wenigstens einer Reihe längs des Schlüsselkanals hintereinander angeordneter, den Zylinderkern relativ zum Gehäuse sperrender und mittels eines in den Schlüsselkanal einsteckbaren Schlüssels entsperrbarer Zuhaltungselemente und
• wenigstens ein in eine zum Umfang des Zylinderkerns offene Tasche des Zylinderkerns eingesetztes Armierungselement seitlich des Schlüsselkanals.

The invention is based on a locking cylinder which comprises:

• a housing,
• a cylinder core rotatable about its cylinder axis in a core receiving bore of the housing, with a key channel extending in the direction of the cylinder axis starting from an insertion end of the cylinder core,
• a plurality of tumbler elements arranged in at least one row along the key channel one after the other, locking the cylinder core relative to the housing and unlockable by means of a key which can be inserted into the key channel
• at least one reinforcement element inserted into a pocket of the cylinder core that is open to the circumference of the cylinder core, to the side of the key channel.

Starting from such a locking cylinder, the above-mentioned object is achieved in that the cylinder core and at least one of the reinforcement elements on the side facing away from the insertion end face have axial projections which at least partially overlap with the contour of the reinforcement element and engage in one another transversely to the cylinder axis.

Such a reinforcement element is not only provided by the undercut surfaces of the pocket in the cylinder core held, but also attached to the cylinder core by the hooking means. The hooking means are, seen from the insertion end of the cylinder core, behind the reinforcement element, and are therefore protected by the reinforcement element against attempts at drilling. Even if the cylinder core should tear off in the region of the pocket during a core pulling attempt, the reinforcement elements are still held on the cylinder core by the hooking means. The same applies if the cylinder core is milled from the front end.

The reinforcing elements can be pins or the like, which are inserted in bores of the cylinder core which run transversely to the cylinder axis. In order, however, to be able to cover the end face of the cylinder core as far as possible, it is preferably provided that the pocket provided in the cylinder core is designed as a slot running in the normal axis and the reinforcement element as a reinforcement plate. The reinforcing plate preferably has a circular section shape, in particular such that it comprises an arcuate edge section that is at least approximately congruent with the circumference of the cylinder core and an, for example, straight edge section that extends essentially parallel to the broadside direction of the key channel. Reinforcing plates of this type, like the associated slots forming the pockets, can be easily produced and, even when the locking cylinder is used for a long time, cause only slight wear in the adjacent area of the core receiving bore of the housing.

In a preferred embodiment, the reinforcement elements are arranged on both sides of the key channel, in particular in pairs, in a common axis-normal plane. At least one pair of the reinforcing elements is preferably towards the front end of the insertion in front of the front end in the insertion direction Arranged tumbler element and preferably the reinforcing elements especially of this pair come close to the broad side of the key channel. In a core pulling test using a core pulling screw, the reinforcement elements arranged on both sides of the key channel work the thread of the core pulling screw in a manner known per se before the screw can grip in the cylinder core material. Reinforcement elements specially designed as reinforcement plates of the type explained above are particularly stable, since they can be supported on the core receiving bore on a large part of their outer circumference and have little tendency to deform themselves.

In a preferred embodiment, the hooking means of the cylinder core on the side facing away from the insertion end of the cylinder core at a distance from the pocket receiving the reinforcement element has a shoulder pointing away from the insertion end and at least partially overlapping with the pocket, while the hooking means of the reinforcement element one Have shoulder part that grips behind the shoulder. The preferably integral with the reinforcing element, i.e. one-piece hooking means and the associated shoulder can run obliquely to the direction of the cylinder axis, which enables comparatively massive hook cross sections. In a preferred embodiment, however, it is provided that the hook part has a web section which extends in the direction of the cylinder axis and an engagement section which extends from the web section essentially along a plane which is normal to the axis. The recesses to be incorporated in the cylinder core for the reception of such hook parts can be produced comparatively easily.

In conventional locking cylinders, the key channel is along its broad side towards the circumference of the cylinder core eccentrically offset and has a narrow side open to the circumference of the cylinder core. In order to be able to better utilize the solid cylinder core cross section remaining in this way opposite the open narrow side and thus to be able to fix the reinforcing element more stably in the cylinder core, the web portion of the hook part explained above is preferably at least partially arranged in the area of the cylinder core approximately opposite the open narrow side of the key channel . Here, too, the web section expediently ends flush with the circumference of the cylinder core.

The engagement section of the hook part can have a shape corresponding to or different from the reinforcing part. In the case of reinforcement parts designed as a pin, the engagement section can also have the shape of a pin, so that the unit consisting of the reinforcement part and the hook part essentially takes the form of a U-shaped bracket which sits with its legs in axially arranged recesses in the cylinder core, for example bores arranged one behind the other. It goes without saying that these cutouts can also be designed as slots and that the two pins can optionally also be connected at both ends to form a closed ring.

The design options explained above for pin-shaped reinforcement elements can also be provided for reinforcement elements designed as plates. Both the reinforcement element and the engagement section of the hook part are preferably designed as plates approximately parallel to one another, which engage in slots of the cylinder core that are normal to the axis and spaced apart from one another. Because the engagement element is also designed as a plate, the interlocking effect is increased. Manufacturing is simplified if the two plates are at least on the side remote from the key channel with one another and with the cylinder core have an essentially congruent contour. The protective effect is particularly great if both plates are congruent overall.

When a core-tightening screw is screwed into the key channel, the reinforcing elements and their hooking means are pushed radially outward against the core-receiving bore of the housing. The core pulling security can be increased if the reinforcing element and / or its hooking means reach up to the circumference of the cylinder core and are provided in the region of the circumference of the cylinder core with at least one cutting edge directed towards the core receiving bore of the housing. During a core pulling test, the cutting edge digs into the housing and grips the core on the housing.

Figur 1

einen teilweisen axialen Längsschnitt durch einen Schließzylinder gemäß der Erfindung;

Figur 2

einen Axialquerschnitt durch den Schließzylinder, gesehen entlang einer Linie II-II in Fig. 1;

Figuren 3a, 3b und 3c

Seitenansichten eines Armierungselements des Schließzylinders;

Figuren 4a, 4b und 4c

Seitenansichten einer Variante eines in dem Schließzylinder verwendbaren Armierungselements und

Figuren 5a, 5b und 5c

Seitenansichten einer weiteren Variante eines Armierungselements.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Here shows:

Figure 1

a partial axial longitudinal section through a lock cylinder according to the invention;

Figure 2

an axial cross section through the lock cylinder, seen along a line II-II in Fig. 1;

Figures 3a, 3b and 3c

Side views of a reinforcing element of the lock cylinder;

Figures 4a, 4b and 4c

Side views of a variant of a reinforcing element that can be used in the locking cylinder and

Figures 5a, 5b and 5c

Side views of another variant of a reinforcement element.

1 and 2 show a lock cylinder with a Housing 1 of the cock profile type, which comprises a cylinder section 3 and a radially projecting web section 5 extending along the cylinder section 3. A cylinder core 11, which contains a key channel 13 extending in the direction of the cylinder axis 9 for receiving a flat key, not shown, is seated in a core receiving bore 7 of the cylinder section 3 so that it can rotate about its cylinder axis 9. In several bores 15 and 17 of the housing 1, on the one hand, and the cylinder core 11, on the other hand, arranged in a row along the key channel 13 in a row, paired tumbler pins 19 and 21, which lock the cylinder core 11 relative to the housing 1 by a spring 23 Position are biased. With a suitable key inserted into the key channel 13, the parting plane 25 of each tumbler pin pair 19, 21 extends tangentially to the circumference of the cylinder core 11, whereby the lock cylinder can be unlocked and the cylinder core 11 can be rotated.

In the area of the first tumbler pin 21 seen from the front end 27 of the cylinder core 11, slots 29 are milled into the cylinder core 11 on both sides of the key channel 13. The slots 29, which run essentially in the same axis-normal plane, extend with their bottoms 31 to close to the broad side of the key channel 13 and form pockets into which reinforcing plates 33 in the form of circular sections are inserted from the radially outside. The reinforcing plates 33 have a circular arc-shaped outer edge 35 which is substantially congruent with the circumference of the cylinder core 11 and an inner edge 37 which runs approximately parallel to the broad side direction of the key channel 13. The mutually facing inner edges 37 of the pair of reinforcing plates form processing edges Destruction of the thread of a core drawing screw, not shown in more detail, screwed into the key channel 13 during a core drawing attempt. Since the reinforcement plates 33 almost completely cover the core cross section, the areas of the core located behind the reinforcement plates 33, as seen from the insertion end 27, are protected from attempts to drill out.

In order to prevent the reinforcement plates 33, which are only loosely inserted into the slots 29, from being removed when the cylinder core 11 is machined, for example milled off, from the insertion end 27 to the slots 29, the reinforcement plates 33 are applied their, facing away from the insertion end 27 integrally molded hooking means in the form of a hook part 39, which engages in the associated hooking means of the cylinder core 11, here a further slot 41 milled axially normal to the slot 29 in the cylinder core 11. 3a to 3c, the web portion 39 has a web portion 43 which integrally connects an engagement plate 45, which engages in the slot 41 and is parallel to the reinforcement plate 33, to the reinforcement plate 33. The engagement plate 45 engages behind a shoulder 47 formed by the slot 41 and facing away from the insertion end 27. The engagement plate 45 and the reinforcement plate 33 have the same outer contour with an arcuate outer edge adapted to the circumference of the cylinder core 11 and a straight inner edge. The web section 43 merges flush with the outer edge in the form of a circular arc and is arranged eccentrically to the center of the circular arc edge. The web section 43 thus comes to lie in the cylinder core 11 at a location with a comparatively large material cross section, approximately diametrically, the open narrow side edge 49 (FIG. 2) of the key channel 13 arranged eccentrically to the axis of rotation 9 in the cylinder core 11. This one in the The area near the tumbler pins 19, 21 is thus particularly well protected against attempts at drilling.

The reinforcing plates 33 including the hook parts 39 are made of hardened steel or hard metal. In order to further increase the securing effect, the circular-arc-shaped outer edges of the reinforcement plate 33 and / or the engagement plate 45 can be chamfered to form cutting edges, as is indicated at 51 in FIG. 1.

Variants of reinforcement elements are explained below. Components having the same effect are designated by the reference numerals of FIGS. 1 to 3, to which reference is made for the purpose of explanation.

In the exemplary embodiment of FIGS. 3a to 3c, the engagement plate 45 is connected to the reinforcing plate 33 by the eccentrically arranged web section 43. The reinforcing element thus has a generally U-shaped shape. As FIG. 3b shows, an additional web section 43a can be provided, so that the reinforcement element corresponding to FIG. 3a generally takes the form of a rectangular ring formed by the reinforcement plate 33, the engagement plate 45 and the two web sections 43 and 43a. As indicated in FIG. 3b at 43b, the web section can also extend essentially over the entire length of the circular-arc-shaped edge of the reinforcement plate 33 and engagement plate 45.

3a to 3c, the engagement plate 45 has the same shape and size as the reinforcement plate 33. FIGS. 4a to 4c show a variant of an engagement plate 45c, which has the same inner contour 37c and the arcuate outer edge 35c of the reinforcement plate 33c follows, but is shortened to an area in the vicinity of the web portion 43c.

5a to 5c show a reinforcing plate 33d, the hook part 39d of which instead of a plate-shaped engagement section projecting beyond the web section 43d in the broad side direction of the key channel has only a nose 45d, the cross-sectional dimensions of which correspond to those of the web section 43d.

5a to 5c at 53, the reinforcement plate 33d can be provided with cutouts for receiving further elements accommodated in the cylinder core 11. These additional elements can be, for example, axles of additional locking levers, as are described in EP-P-237 799.

Claims (15)

1. A cylinder lock, comprising

   - a housing (1),

   - a cylinder plug (11) accommodated in a plug receiving bore (7) in the housing (1) so as to be rotatable about its cylinder axis (9), said cylinder plug (11) having a key channel (13) extending from an insertion end (27) of the cylinder plug (11) in the direction of the cylinder axis (9),

   - a plurality of tumblers (19, 21) arranged one behind the other in at least one row along the key channel (13) and locking the cylinder plug (11) with respect to the housing (1) and being unlockable by means of a key insertable into the key channel (13), and

   - at least one reinforcing element (33, 39) to the side of the key channel (13) and inserted into a pocket (29) in the cylinder plug (11) open towards the circumference of the cylinder plug (11),

   characterised in that the cylinder plug (11) and at least one of the reinforcing elements (33, 39) comprise interlocking means (39, 41) engaging with each other perpendicularly to the cylinder axis (9) and overlapping, in axial projection, at least partially with the contour of the reinforcing elements (33, 39) on the side remote from the insertion end (27).
2. A cylinder lock according to claim 1, characterised in that the pocket is a slit (29) extending normally to the axis and the reinforcing element (33, 39) comprises a reinforcing plate (33), especially with a contour in the form of a segment of a circle.
3. A cylinder lock according to claim 2, characterised in that the reinforcing plate (33) comprises an edge portion (35) in the form of a segment of a circle and at least approximately congruent with the circumference of the cylinder plug (14) and an especially straight edge portion (37) extending substantially parallel to the direction of the broad face of the key channel (13).
4. A cylinder lock according to any one of claims 1 to 3, characterised in that reinforcing elements (33, 39) are arranged on each side of the key channel (13) especially in pairs in a common plane normal to the axis.
5. A cylinder lock according to claim 4, characterised in that at least one pair of the reinforcing elements (33, 39) is arranged, towards the insertion end (27), in front of the tumbler (19, 21) at the front in the insertion direction.
6. A cylinder lock according to claim 4 or claim 5, characterised in that the reinforcing elements (33, 39) of the pair extend to near the broad face of the key channel (13).
7. A cylinder lock according to any one of claims 1 to 6, characterised in that, on the side remote from the insertion end (27) of the cylinder plug (11) at a distance from the pocket (29) accommodating the reinforcing element (33, 39), the interlocking means of the cylinder plug (11) comprise a shoulder (47) overlapping the pocket (29) at least partially and directed away from the insertion end (27) and the interlocking means (39) of the reinforcing element (33, 39) comprise a hook member (39) engaging behind the shoulder (47).
8. A cylinder lock according to claim 7, characterised in that the hook member (39) comprises a web portion (43) extending in the direction of the cylinder axis (9) and an engagement portion (45) extending from the web portion (43) substantially along a plane normal to the axis.
9. A cylinder lock according to claim 8, characterised in that the key channel (13) is staggered along its broad face eccentrically towards the circumference of the cylinder plug (11) and has a narrow face (49) open towards the circumference of the cylinder plug (11) and in that the web portion (43) is arranged at least partially in an area of the cylinder plug (11) lying approximately opposite the open narrow face (49) of the key channel (13) in the direction of the broad face thereof.
10. A cylinder lock according to claim 8 or claim 9, characterised in that the web portion (43) ends flush with the circumference of the cylinder plug (11).
11. A cylinder lock according to any one of claims 8 to 10, characterised in that both the reinforcing element and the engagement portion of its hook member (39) are constructed as approximately mutually parallel plates (33, 45) which engage in slits (29, 41) in the cylinder plug (11) extending normally to the axis and at a distance from each other.
12. A cylinder lock according to claim 11, characterised in that the two plates (33, 45) have contours substantially congruent with each other and with the cylinder plug (11) at least on the side remote from the key channel (13).
13. A cylinder lock according to claim 12, characterised in that the two plates (33, 45) are completely congruent.
14. A cylinder lock according to any one of claims 1 to 13, characterised in that the reinforcing element (33, 39) and/or its interlocking means (39) extend(s) as far as the circumference of the cylinder plug (11) and is/are provided in the area of the circumference of the cylinder plug (11) with at least one cutting edge (51) directed towards the plug receiving bore of the housing.
15. A cylinder lock according to any one of claims 1 to 14, characterised in that the reinforcing element (33, 39) and its interlocking means (39) are connected integrally together.

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