EP3795785B1 - Lock and key system - Google Patents

Description

The invention relates to a lock-key system, with a cylinder core rotatably mounted in the cylinder housing and a locking bit that can be coupled to a flat key of the lock-key system that can be inserted into the cylinder core in order to carry out a common turning process that triggers the locking function.

In such systems, a coupling is usually provided for the connection between the key inserted into the key channel of the cylinder core and the lock bit. This increases the number of parts required to assemble the locking cylinder, which makes the product more expensive on the one hand and more vulnerable on the other.

FR 2 080 445 A5 discloses a lock-key system with a one-piece lock bit.

The object of the invention is therefore to create a lock-key system that is characterized by a simpler structure and is cheaper to manufacture.

This object is achieved according to the invention in a lock-key system with a cylinder core rotatably mounted in the cylinder housing and a locking bit that can be coupled to a flat key of the lock-key system that can be inserted into the cylinder core to carry out a common turning process that triggers the locking function , wherein the key tip positively engages directly with the one-piece locking bit and can therefore be coupled, in that the locking bit, facing the cylinder core at the front, has at least one axially projecting feature with which the tip of the key shaft can be brought into engagement for coupling.

Preferred configurations result from the subclaims.

The key tip is flat and narrower in a small area; Designed similar to a screwdriver blade and with an additional chamfer at the front.

The locking cam with integrated coupling is one-piece; there are no moving parts. When the key is turned, the key tip takes the locking bit with it in a form-fitting manner and couples on one side in the direction of rotation to a protruding feature in the locking bit. This feature is shaped towards the lock cylinder core so that the chamfered key tip always rotates the lock blade to a position where the key can be fully inserted into the cylinder core.

This principle has the advantage that functions such as double-sided closing and "FZG" can be achieved without any additional effort.

With this solution there are no other moving parts in the coupling. Coupling and lock bit are one part. Functions such as locking on both sides and “FZG” (freewheel cylinder for gear locks) are already part of this solution.

The invention will be explained in more detail below with reference to the drawings.

Fig. 1

eine Teilansicht des Schlüssels und Schließzylinders,

Fig. 2

das Detail X

Fig. 3

die Schlüsselspitze

Fig. 4

eine perspektivische Ansicht des Schließzylinders - teilweise geschnitten - mit eingeführtem Schlüssel

Fig. 5

das Detail Y und

Fig. 6

den Schließbart mit den integrierten Merkmalen.

This shows:

Fig. 1

a partial view of the key and lock cylinder,

Fig. 2

the detail X

Fig. 3

the key tip

Fig. 4

a perspective view of the lock cylinder - partially cut - with the key inserted

Fig. 5

the detail Y and

Fig. 6

the lock bit with the integrated features.

In the Figure 1 the lock cylinder is designated 10, the cylinder core is designated 2, the lock bit is designated 3, the edge of the key is designated 1 and the tip of the key shaft is designated 4.

In the Figure 2 This key tip 4 is shown in detail, with the surface on the key being designated 9, which touches the driver on the locking bit and thus rotates the locking bit.

The outer diameter of the cylinder core serves as a guide for the lock bit 3.

In the Figure 6 the lock bit 3 is shown with the features, ie the drivers 5. These drivers 5 have a straight surface 6 over which the tip of the key moves or rotates the lock bit.

The pyramid-shaped formations 7 with the dome-shaped tip 8 serve to guide the key in the event that the lock bit is positioned so unfavorably when the key is inserted that the key tip hits exactly one of the drivers 5.

Due to the pyramid-shaped shape with a dome-shaped tip 8, the key rotates the lock bit so that the positive connection between the key tip and the driving surface 6 is achieved can come.

The Figure 5 shows again the key tip 4 and the lock bit 3. The surface 9 on the key, which forms a positive connection with the surface 6 of the driver 5, should be made clear again here, whereby the driver 5 has two driver surfaces 6. Depending on the application, the lock bit can have several drivers.

Claims (5)

1. Lock and key system, having a cylinder core (2) that is rotatably mounted in the cylinder housing and a lock bit (3) that is capable of being coupled with a flat key of the lock and key system that is capable of being inserted into the cylinder core (2) to carry out a joint rotating operation that triggers the locking function,

   wherein the key tip (4) is directly engaged and is capable of being coupled with the one-piece lock bit (3) in an interlocking manner,

   characterised in that

   the lock bit (3), which faces the cylinder core (2) on the front side, has at least one axially protruding feature (5), with which the key tip (4) is capable of being brought into engagement for the coupling.
2. Lock and key system according to claim 1,
   characterised in that
   the axially protruding feature (5) on the lock bit (3) is formed such that the key tip (4) can always displace this feature (5) when the key is inserted and can produce the interlocking fit of the key and feature (5).
3. Lock and key system according to one of the preceding claims,
   characterised in that
   the feature (5) is formed as a pyramid with a dome.
4. Lock and key system according to one of the preceding claims,
   characterised in that
   the lock bit (3) is guided on the cylinder core (2).
5. Lock and key system according to one of the preceding claims,
   characterised in that
   the position of the protruding feature (5) is chosen such that there is an overlap with the surface on the key tip (4).

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