EP3418476B1 - Lock cylinder with a key authorised for locking - Google Patents

Description

The invention relates to a lock cylinder with a key authorized to lock, with a core rotatably mounted in a housing, with a locking mechanism for optionally blocking or releasing the movement of the core, with a locking channel for inserting a shaft of the key into the core, with means of the Introduced into the keyway key to control the locking mechanism, with a key magnet arranged in the key and a magnetic locking body guided in a pocket of the core, the housing having a catch pocket for partially receiving the locking body and the force of the key magnet for holding the locking body within the core is sized.

The locking mechanism of the lock cylinder can, for example, be an electronic locking mechanism which can be controlled by a code of an electronic component in the key. Likewise, the locking mechanism can also have commonly used mechanical pin tumblers, which can be controlled from locking recesses in the key. Key magnets make it difficult to make copies of the key authorized to lock, for example by means of a 3D printer, manual reworking of the external shape or by unauthorized reading and copying of the code.

The EP 3 101 206 A1 discloses a lock cylinder in which, in a basic position, a blocking element is arranged in an aligned pocket between the housing and the core. A key that can be inserted into the lock cylinder in the basic position has a magnet for attracting and holding the blocking element. If the blocking element is not attracted by the key, rotation of the core is blocked and the key can be removed again.

The U.S. 4,627,251 A discloses a locking system in which a blocking element can be moved out of a locking position by a magnet arranged in a key. In the locked position, the blocking element prevents an initial rotation of the core.

The U.S. 3,416,336 A discloses a locking device with a plurality of magnets arranged in a key for controlling magnets arranged in a lock. The magnets have an intended polarity to one another.

From the DE 30 16 393 A1 a locking device has become known in which the core has a guide for a magnetic ball that extends into the locking channel. The key has a recess for receiving and supporting the ball. This ball faces a recess in a locking ring and is attracted by a magnet in the key. The disadvantage of the known locking device is that if the lock cylinder is attempted to be unlocked with a key that is not authorized to lock without a key magnet, the key can be removed again. This means that attempts at manipulation remain undetected and the attempt at manipulation can be repeated.

The invention is based on the problem of developing a lock cylinder with a key authorized to lock it in such a way that an attempt at manipulation is easily recognized.

This problem is solved according to the invention in that the catch pocket is arranged next to the key withdrawal position in the direction of rotation of the core and that the catch pocket in the key withdrawal position is at least partially arranged outside the area covered by the pocket in the core.

With this design, the movement of the core is initially blocked by the locking mechanism in the event of a manipulation attempt with a key copy that is not authorized to close. When overcoming the locking mechanism, the core can initially be rotated a little out of the key withdrawal position before the locking body gets into the catch pocket and prevents further movement of the core there. As a result, a key that is not authorized to close can neither close the lock cylinder nor be removed from the lock cylinder without a key magnet. The lock cylinder thus has a key withdrawal lock and an unauthorized unlocking attempt can easily be determined. Since a key authorized to lock both controls the locking mechanism and holds the locking body completely within the core, the core can be rotated and the lock cylinder closed. A complete turning back of the core into the key withdrawal position with the locking body in the catch pocket becomes reliable prevented because the catch pocket is arranged in the key withdrawal position at least partially outside of the area covered by the pocket in the core.

According to another advantageous development of the invention, catching a key that is not authorized to close turns out to be particularly simple in terms of construction if the catch pocket is offset by an angle of rotation of the core of about 30 ° with respect to the key withdrawal position. When the core is rotated by 30 °, the usual locking mechanisms of known lock cylinders hold the key in the lock channel. The key can then not be pulled out of the keyway.

According to an advantageous development of the invention, the locking body is reliably held in its intended position in the key removal position when the locking body is held completely within the pocket of the core in the key removal position. Another advantage of this design is that the locking body does not have to be attracted by the key magnet. The locking body is thereby held in the core in a position in which it can easily be held by the key magnet.

According to another advantageous development of the invention, blocking of the movement of the core can be ensured particularly reliably if the pocket in the core has the shape of a segment.
When the lock cylinder is closed with the key authorized to close the locking body, according to another advantageous development of the invention, the locking body is reliably kept away from the catch pockets if the pocket in the core has a recess for receiving the locking body directly below the locking channel. This reliably prevents malfunctions.

According to another advantageous development of the invention, the lock cylinder is particularly simple in construction if the catch pocket is designed as a trough-shaped recess in the wall of the housing.

According to another advantageous development of the invention, it contributes to the further structural simplification of the lock cylinder if the locking body is designed as a ball, preferably a steel ball.

The locking body could be moved into the catch pocket by almost any force. For example, the locking body could be preloaded in the direction of the catch pocket by gravity or a spring force. A particularly reliable movement of the locking body into the catch pocket can be easily achieved according to another advantageous development of the invention if the housing has a housing magnet for attracting the locking body into the catch pocket and that the force exerted by the housing magnet on the blocking body is smaller than that of force exerted by the key magnet. Compared to gravity, the housing magnet enables the lock cylinder to be installed in any position. In comparison to a spring force for prestressing the blocking body, the housing magnet does not require any installation space in the core that is complex to generate.

According to another advantageous development of the invention, the lock cylinder can be used in a variety of ways if the housing has a catch pocket and a housing magnet for each direction of rotation of the core. With this design, the lock cylinder can be used in right and left-hand doors.

The key magnet could for example be cast in the key. However, this leads to a very complex production of the key. According to another advantageous development of the invention, it contributes to simplifying the assembly of the key magnet if the key magnet is arranged in a stop axially abutting the core.

According to another advantageous development of the invention, removal or destruction of the housing magnet can be reliably avoided if the housing magnet is arranged outside an end face of the lock cylinder. As a result of this design, the housing magnet is inaccessible when the lock cylinder is installed.

According to another advantageous development of the invention, at least one of the components of the key magnet or the housing magnet is fastened in a bore that is open on one side to further simplify the assembly. With this design, a hole can be arranged in the stop of the key or a side wall of the lock cylinder and the key magnet or the housing magnet can be fastened in the hole, for example by pressing or gluing.

Fig. 1

einen Schließzylinder mit einem Schlüssel,

Fig. 2

eine Schnittdarstellung durch den Schließzylinder aus Figur 1 entlang der Linie II - II,

Fig. 3

vergrößert einen Teilbereich des Schließzylinders aus Figur 1 in einem Grundzustand,

Fig. 4

den Schließzylinder aus Figur 3 beim Schließen mit einem zum Schließen berechtigten Schlüssel,

Fig. 5

den Schließzylinder aus Figur 3 beim Schließen mit einem nicht zum Schließen berechtigten Schlüssel.

The invention allows numerous embodiments. To further clarify its basic principle, one of them is shown in the drawing and is described below. This shows in

Fig. 1

a lock cylinder with a key,

Fig. 2

a sectional view through the lock cylinder Figure 1 along the line II - II,

Fig. 3

enlarges a portion of the lock cylinder Figure 1 in a basic state,

Fig. 4

the lock cylinder Figure 3 when closing with an authorized key,

Fig. 5

the lock cylinder Figure 3 when closing with a key that is not authorized to close.

Figure 1 shows a lock cylinder 1 with a key 2 authorized to lock. The lock cylinder 1 has a core 4 rotatable in a housing 3 and a locking mechanism 5 for optionally blocking or releasing the movement of the core 4. The locking mechanism 5 has in the illustrated embodiment a number of Pin tumblers 6 arranged in the lock cylinder 1, which are controlled by locking recesses 8 arranged in a shaft 7 of the key 2. In an exemplary embodiment that is not shown, the blocking mechanism 5 can also have an electronically controllable actuator for blocking or releasing the movement of the core 4. The core 4 is connected to a lock bit 9 and has a locking channel 10 for receiving the shaft 7 of the key 2. The key 2 also has a bow 11 and a stop 12 with which it is supported on an end face of the core 4.

The stop 12 is shown here in partial section and has a bore 13 for receiving a key magnet 14. In the core 4, a magnetic locking body 15 is arranged in a pocket 16. The locking body 15 is designed as a steel ball and is held completely within the core 4 in the position shown. The locking body 15 is attracted by the key magnet 14 and held on the upper wall of the pocket 16.

Figure 2 shows the lock cylinder 1 with the inserted key 2 authorized to lock Figure 1 in a key withdrawal position in which the key 2 can simply be inserted into the lock cylinder 1 and withdrawn from it. The key magnet 14, which is not arranged in the cutting plane, is shown in FIG Figure 2 shown in dashed lines.
At an angle of rotation of the core by approximately 30 ° to the key withdrawal position 3 catch pockets 17, 18 are arranged in the housing. Immediately below the catch pockets 17, 18, the housing 3 has a respective housing magnet 19, 20. The housing magnets 19, 20 exert a lower force of attraction on the locking body 15 than the key magnet 14.

Figure 3 shows a partial area of the lock cylinder 1 on an enlarged scale Figure 2 without a key. It can be seen here that the locking body 15 is not attracted to the upper wall of the pocket 16. A rotation of the core 2 is caused by the in Figure 1 described locking mechanism 5 prevented. Furthermore, in Figure 3 It can be seen that the catch pocket 17, 18 in the illustrated key removal position is at least partially arranged outside the area covered by the pocket 16 in the core 4. Thus, the core 4 can only Assume the key withdrawal position shown when the locking body 15, as shown, is not in one of the catch pockets 17, 18.

Figure 4 shows the locking of the lock cylinder 1 with the key 2 authorized to lock. The in Figure 1 The locking mechanism 5 described is activated and the locking body 15 is attracted here by the key magnet 14 into a trough 21 arranged at the upper end of the pocket 16. The core 4 can be rotated relative to the housing 3.

Figure 5 shows an attempted closing of the lock cylinder 1 with a not authorized to lock key 22, in which the in Figure 4 Key magnet 14 described is missing. After overcoming the in Figure 1 The locking mechanism 5 described, the core 4 can initially be rotated. However, since the locking body 15 can initially move freely in the pocket 16, it is attracted by one of the housing magnets 19 into one of the catch pockets 17. This prevents further rotation of the core 4. However, complete turning back of the core 4 into the key withdrawal position is also prevented because the locking body 15 remains in the catch pocket 17. The key 22 that is not authorized to lock is thus caught in the lock cylinder 1.

Claims (12)

1. A cylinder lock (1) having a key (2) authorized to lock, having a core (4) rotatably mounted in a housing (3), having a blocking mechanism (5) for the selective blocking or release of the movement of the core (4), having a locking channel (10) for introducing a shaft (7) of the key (2) into the core (4), having means of the key (2) introduced into the locking channel (10) for actuating the blocking mechanism (5), having a key magnet (14) arranged in the key (2) and a magnetic blocking body (15) guided in a pocket (16) of the core (4), wherein the housing (3) has a catching pocket (17, 18) for partially accommodating the blocking body (15) and the force of the key magnet (14) is dimensioned for holding the blocking body (15) within the core (4), characterized in that the catching pocket (17, 18) is arranged in the direction of rotation of the core (4) next to the key withdrawal position and that the catching pocket (17, 18) is arranged in the key withdrawal position at least partially outside of the region covered by the pocket (16) in the core (4).
2. The cylinder lock according to claim 1, characterized in that the catching pocket (17, 18) is offset by an angle of rotation of the core of about 30° relative to the key withdrawal position.
3. The cylinder lock according to claim 1 or 2, characterized in that the blocking body (15) is held completely within the pocket (16) of the core (4) in the key withdrawal position.
4. The cylinder lock according to any one of the preceding claims, characterized in that the pocket (16) in the core (4) has the form of a segment.
5. The cylinder lock according to any one of the preceding claims, characterized in that the pocket (16) in the core (4) directly below the locking channel (10) has a trough (21) for accommodating the blocking body (15).
6. The cylinder lock according to any one of the preceding claims, characterized in that the catching pocket (17, 18) is designed as a trough-shaped recess of a wall of the housing (3).
7. The cylinder lock according to any one of the preceding claims, characterized in that the blocking body (15) is designed as a ball, preferably a steel ball.
8. The cylinder lock according to any one of the preceding claims, characterized in that the housing (3) has a housing magnet (19, 20) for attracting the blocking body (15) into the catching pocket (17, 18) and that the force exerted by the housing magnet (19, 20) on the blocking body (15) is less than the force exerted by the key magnet (14).
9. The cylinder lock according to claim 8, characterized in that the housing (3) for each direction of rotation of the core (4) in each case has a catching pocket (17, 18) and in each case a housing magnet (19, 20).
10. The cylinder lock according to any one of the preceding claims, characterized in that the key magnet (14) is arranged in a stop (12) axially abutting the core (4).
11. The cylinder lock according to claims 8 to 10, characterized in that the housing magnet (19, 20) is arranged outside an end face of the cylinder lock (1)
12. The cylinder lock according to any one of claims 8 to 11, characterized in that at least one of the components of the key magnet (14) or of the housing magnet (19, 20) is fastened in a bore (13) open on one side.

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