EP0911465B1 - Flat key for cylinder lock - Google Patents

Abstract

The key portions (1,2,4-6) are milled away to a predetermined code, and a drilled notch (3) is also formed in the key.

Description

The invention relates to a flat key for cylinder locks, which cannot be copied with the previous methods is and refers to conventional systems from Cylinder locks with a profiled vertical key channel.

With these systems, the key is inserted vertically and has corresponding vertical mills. By inserting the key correctly - Locking element - in the according to the key profile shaped key channels are of different lengths pins designed in accordance with the milling depth pressed a level and release a dividing line. This ensures that the profile core in the housing can be rotated. Crucial for the functioning this process is the right match between Milling in the key and the length of the corresponding Core pin.

The key contains with its symmetrically inserted Milling a so-called code.

Conventional copying methods for this type of cylinder system are based on the fact that the corresponding Code with the help of scanning - mechanical or optical - or with the help of registered code numbers - with computer-controlled Copy milling machines - axially on one is transferred to the milling cutter moving the key shaft.

This milling cutter transfers the corresponding millings congruent on the duplicate key to be produced. Basically, all geometrical shapes of the millings are copied based on the Milling process used in the production of the original key were used. Thus, in practice in the presence of a key blank with appropriate key profiles with conventional ones Copy milling machines all keys of the aforementioned Systems are copied.

According to DOS 2 632 172 and 2 517 689 are cylinder locks known whose design features reversible key condition, whose wide insertion surfaces are stanchions exhibit. Locking pins engage in these holes of the rotor in the cylinder housing and operate the lock when the key is turned. These keys are by known methods copyable.

In DE-PS 44 20 015 C 1 is a cylinder flat key known that instead of milled grooves notches has, in which tumbler elements in the form of Pins located in the cylinder core of the lock intervene and set the lock in motion. With that higher copy security can be achieved with it it is necessary that the geometry of the bore with the The geometry of the locking elements must match got to.

EP-A-0 599 805 discloses a Cylinder flat key described, the Notches on a narrow side of the key shaft are milled in. To the copy security of the Key using known copy milling machines prevent at least one of these notches milled in such a way that the notch faces the other Broad sides of the key shaft different Have heights.

Furthermore, according to DE 43 16 439 A 1 is a flat key known for locking cylinder, which with locking notches for Classification of tipped pin tumblers, the closing notch flanks being concavely curved surfaces in the form of holes of different depths. To copy this key, there are corresponding drilling devices required.

The invention has for its object a flat key for cylinder locks to develop the with the conventional methods using copy milling machines cannot be copied.

This is according to the invention by the characterizing Part of the claim solved.

The invention is described below using an exemplary embodiment shown.

Fig. 1

Seitenansicht des Zylinderschlüssels ohne Griff

Fig. 2

Draufsicht nach Fig. 1

Fig. 3

Schnitt nach Fig. 1

The drawing shows:

Fig. 1

Side view of the cylinder key without a handle

Fig. 2

Top view according to FIG. 1

Fig. 3

Section according to FIG. 1

In Figure 1 is the side view of the flat key shown for cylinder locks without handle, in which recesses 1, 2, 3, 4, 5 and 6 axially to the key shank, namely symmetrical milling 1, 2, 4, 5, 6 accordingly the predetermined code are arranged. As from the figures 1 to 3, the flat key also assigns this symmetrical milling 1, 2, 4, 5, 6 instead of one Milling a drilled notch 3, which is arranged so that they are between the asymmetrical profile grooves 7, the lie on both sides of the key shaft.

The base of the drilled notch 3 corresponds to the depth the original not machined notch. In Connection with the profile grooves 7 arise differently high side walls 3a and 3b. Revealed in the lock cylinder itself there are no changes.

This principle also allows the attachment of several of these drilled notches 3 instead of symmetrical cutouts.

The geometric shape of the drilled notch 3 is so designed a problem-free moving of the tumbler elements is possible with the axial movement of the key.

With these two different configurations of the recesses 1, 2, 3, 4, 5 and 6, namely the drilled notch 3 and the millings 1, 2, 4, 5, 6 of the flat key for insertion the corresponding code ensures that a Copy the key with the help of those used in practice Copying technology can not be done. Scanning at Copying is done optically or mechanically. Connected with that that the highest point that the scanning system registered, transmitted.

Based on this embodiment, it is for Key cutting machines, the vertical milling cannot manufacture or copy wells, not possible, the geometric shape necessary for closing transferred to.

Due to the different heights of the side walls 3a and 3b of the holes is a copy of the key much more difficult.

This ensures that a flat key with this Combination of millings 1, 2, 4, 5, 6 and drilled 3 notch an effective protection against unauthorized Represents copying keys.

From this it follows that for copying the Key, especially the hole, a special one Copying technology is needed. Only with this special one Copying technology is precise positioning and geometric Design of the bore, based on the constructive Design of the cylinder lock, possible.

Copying can only be done using a special Copying technology with appropriate tools.

List of the reference symbols used

1,2,3,4,5,6

Recesses

1,2,4,5,6

Milling

3rd

drilled notch

3a

Side wall height of the notch 3

3b

Side wall height of the notch 3

7

Profile grooves

Claims (1)

1. Flat key for cylinder lock systems with profiled vertical key shank having recesses on one of its narrow sides extending parallel with it and over its total width whereby these recesses (1, 2, 3, 4, 5, 6) correspond to a preset code identified owing to the fact that one of the recesses (3) is drilled in a way that it has different heights of side walls (3a and 3b) between the asymmetric profile grooves (7) laying on both sides of the key shank and that all other recesses (1, 2 4, 5, 6) are milled.

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