EP3795785A1 - Lock and key system - Google Patents

Abstract

1. Lock-key system.2.1. The invention relates to a lock-key system with a cylinder core that is rotatably mounted in the cylinder housing and a locking bit that can be coupled with a flat key that can be inserted into the cylinder core to carry out a common turning process that triggers the locking function.2.2. The key tip is in direct, positive engagement with the one-piece locking bit and can be coupled with it.

Description

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

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

The object of the invention is therefore to create a lock-key system which 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 lock bit which can be coupled to a flat key that can be inserted into the cylinder core to perform a common turning process that triggers the locking function, in that the key tip is positively engaged directly with the one-piece locking bit and can be coupled therewith.

Preferred configurations emerge from the subclaims.

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

The lock bit with integrated coupling is one-piece; there are no moving parts. When the key is turned, the key tip takes the lock bit directly with it in a form-fitting manner and couples on one side in the direction of rotation to a protruding feature in the lock bit. This feature is shaped in the direction of the lock cylinder core in such a way that the chamfered key tip always turns the lock bit into a position in which the key can be completely inserted into the cylinder core.

This principle has the advantage that functions such as closing on both sides and "FZG" can be achieved without additional effort.

With this solution there are no other moving parts in the coupling. The clutch and cam are one part. Functions such as locking on both sides and "FZG" (free-wheeling cylinder for gear locks) are already part of this solution.

The invention is to 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.

It 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 with 10, the cylinder core with 2, the lock bit with 3, the bow of the key with 1 and the tip of the key shaft with 4.

In the Figure 2 this key tip 4 is shown in detail, the surface on the key being denoted by 9, which touches the driver on the lock bit and thus rotates the lock 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 via which the key tip takes the lock bit with it or rotates it.

The pyramid-shaped formations 7 with the dome-shaped tip 8 are used for key guidance in the event that the lock bit is so unfavorable when inserting the key that the key tip hits one of the drivers 5 exactly.

Due to the pyramidal shape with dome-shaped tip 8, the key rotates the lock bit so that the form fit between the key tip and the driver surface 6 is achieved can come.

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

Claims (6)

Lock-key system, with a cylinder core rotatably mounted in the cylinder housing and a lock bit that can be coupled with a flat key that can be inserted into the cylinder core to perform a common turning process that triggers the locking function,
characterized,
that the key tip is directly in positive engagement with the one-piece locking bit and can be coupled to it. Lock-key system according to claim 1,
characterized,
that the lock bit, facing the cylinder core on the front side, has at least one axially protruding feature with which the tip of the key shaft can be brought into engagement for the coupling. Lock-key system according to claim 2,
characterized,
that the axially protruding feature on the lock bit is designed so that the key tip can always move this feature when inserting the key and establish the form fit of the key and feature. Lock-key system according to one of the preceding claims,
characterized,
that the feature is designed as a pyramid with a dome. Lock-key system according to one of the preceding claims,
characterized,
that the lock bit is guided on the cylinder core. Lock-key system according to one of the preceding claims,
characterized,
that the position of the above feature is selected such that there is an overlap with the surface at the key tip.

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