CZ33198A3 - Flat key for lock with cylindrical tumbler - 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

Cylinder lock key for conventional cylinder lock systems with vertical profiled key slot, which is not copyable by conventional methods and provided with symmetrical milled recesses according to a pre-entered code axially symmetrical to the shank of this flat key milled recesses / 1, 2 , 5, 6 /. Instead of one milled recess, a drilled notch (3) is formed therein, which delimits the side walls (3a, 3b) of different height between the asymmetric profile grooves (7) on both sides of the flat key shank.

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Z 02980/98-EN

Flat key for lock with cylinder

Technical field

The invention relates to a flat key for a cylinder lock for conventional cylinder lock systems with a vertical profiled key slot, which is not copyable by conventional methods and is provided with symmetrical milled recesses.

BACKGROUND OF THE INVENTION In these systems, the key is retracted vertically and has correspondingly vertically arranged milled recesses. By correctly inserting the key of the locking element in the key slot corresponding to the cross-section of the key profile, the different lengths, the length of which is adapted to the depth of the milled recesses in the key, are pushed out so that their opposite ends are flush and with dividing line. As a result, the profile core can be rotated in the cylinder sleeve. Correct adjustment of the milled recesses in the key to the length of the corresponding pins in the profile core of the cylindrical groove is decisive for the proper operation of this process.

On a key in which recesses are milled symmetrically, so-called code is created.

Existing methods of copying keys for this type of cylinder locks consist in that the respective code is mechanically or optically scanned and transmitted to a milling cutter axially relative to the key shaft. In the case of computer-controlled copy milling cutters, this is done on the basis of the registered code cutters. 4 · «· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · * · · * ···

- 2 numbers.

This cutter transfers the recesses that are milled in the template to the exact copy of the key. In principle, it is possible to copy all geometric shapes of milled recesses that are on the original, that is to say, created on the original key. Thus, in practice, if a key blank with a corresponding profile is available, all keys for said system can be copied using existing copying devices.

DOS 2 263 1 72 and 2 517 689 disclose cylindrical cylinder locks whose construction envisages rotary wrenches in which the flat sides which are inserted into the cylinder are provided with bores. These bores engage the locking pins of the rotor located in the cylindrical housing, which actuate the lock when the key is rotated. These keys can be copied in known ways.

DE-PS 44 20 015 C1 describes a flat cylinder for cylindrical inserts which, instead of milled slots, is provided with drilled depressions, which are received by pin-shaped retaining elements which are received in the cylinder core and actuate the lock. In this way, a better securing against unauthorized cage copying is to be achieved, and it is inevitable that the drilling geometry corresponds to that of the retaining elements.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flat key for locks with cylindrical inserts that cannot be copied by conventional milling cutters.

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SUMMARY OF THE INVENTION

This object is solved and the drawbacks of known flat keys of this kind largely eliminate a cylinder key for a cylinder lock for conventional cylinder lock systems with a vertical profiled key slot, which is not copyable by conventional methods and is provided with symmetrical milled recesses according to the invention. the key consists in that the flat key has axially symmetrical recesses in the key shaft of the flat key according to a predetermined code and instead of one milled recess there is a drilled notch formed independently of the cylinder lock, which between the asymmetric profile grooves on both sides of the flat key the keys define mutually high side walls.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated by the following non-limiting examples, which are described in the accompanying drawings, in which:

handles,

FIG. 2 is a plan view of the flat nose of FIG. 1, and

FIG. 3 shows a section through a flat key in the plane shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a side view of a flat key for a cylinder

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Φ Φ Φ · · · · · · · · «• • • • φ φ φ φ φ φ φ φ φ φ φ · · · bez bez bez bez bez bez bez bez bez bez bez bez bez bez bez bez recesses 1, 2, 4, 5, 6, which are axially symmetrical with respect to the shank of the flat key. As can be seen from FIGS. 1 to 3, in addition to the symmetrically milled recesses 1, 2, 4, 5, 6, instead of a milled recess, the flat key is provided with a drilled notch 3, the drilling of which is arranged on the upper edge of the flat key. is located between the asymmetric profile grooves 7, which are formed on both sides of the shank of the flat key.

The bottom or base of the bore of the notch 3 corresponds to the depth of the unmachined milling recess. In connection with the profile holders 7, side walls 3a, 3b of different heights are formed. This does not imply any modifications in the cylindrical insert itself for which the flat key is intended.

The described principle makes it possible to use several such notches 3 instead of symmetrically milled recesses.

The geometrical shape of the bore of the notch 3 is designed in such a way that it is possible to displace the retaining elements during axial movement of the key without problem.

These different designs of the drilled notch 3 and the milled flat key recesses 1, 2, 4, 5, 6, which correspond to the corresponding code, make it possible to copy the flat key using conventional copiers. Scanning is performed optically or mechanically. This implies that the highest point detected by the sensing system is always transmitted.

Due to this design, flat key milling devices that cut transverse notches or can copy drilled recesses cannot transfer

the geometric shape required for locking.

The copying of the flat key is substantially impeded by the different heights of the side walls 3a and 3b of the bore notches 3.

In this way, the flat key with this combination of milled recesses 1, 2, 4, 5, 6 and the bore 3 is effectively protected against unauthorized copying.

It also follows that a special copying device is required for copying such a flat key, in particular its bore 3. Only with this special copying device can the exact position and geometric shape of the bore in relation to the cylinder insert be achieved.

Represented by:

04.02.98

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Z02980 / 98-GB

PATENT CLAIMS

Claims (1)

Cylinder lock key for conventional cylinder lock systems with a vertical profiled key slot, which is not copyable by conventional methods and is provided with symmetrical milled recesses, characterized in that it is axially symmetrical to the shaft of the flat key according to a predetermined code a drilled notch (3) is formed therein, independent of the lock cylinder, which delimits differently between the asymmetric profile grooves (7) on both sides of the shank of the spanner high side walls (3a, 3b). Represented by: Ing.J.Chlustina 04.02.98