DE102016119032A1 - Key profile for flat key - Google Patents

Abstract

The invention relates to a key profile for flat key, which is formed on the side surfaces of the key shank and cooperates with a corresponding profiling in the keyway of a cylinder housing rotatably mounted in the lock cylinder housing (1). In this case, the profiling on variable (3) and fixed (4) profile features, wherein the fixed profile features (4) straight profile surfaces in the key reason and the fixed (4) and variable (3) profile surfaces have radii on the key outside.

Description

The invention relates to a key profile for flat key, which is formed on the side surfaces of the key shank and cooperates with a corresponding profiling in the keyway of a cylinder housing rotatably mounted in the lock cylinder housing.

Key profiles for locking systems usually have different profile features in order to distribute shooting authorizations via a locking system. To be able to close with a parent key in all subordinate lock cylinder, it is necessary that the fixed profile features over all locking cylinders of this system are the same. By adding or omitting so-called variable profile features, there are situations in which the key fits into the closing channel or can not be inserted at all.

The object of the invention is to provide a key profile that offers improved copy protection.

This object is achieved according to the invention in a key profile for flat key, which is formed on the side surfaces of the key shank and cooperates with a corresponding profiling in the keyway of a cylinder housing rotatably mounted in the lock cylinder housing, characterized in that the profiling variable and fixed profile features and that the fixed profile features straight Profile surfaces in the key base and the fixed and variable profile surfaces have radii on the outside of the key.

Further developments emerge from the subclaims and are described below.

In detail, the radii of the variable profile features are dependent on the width of the profile features at the respective layers, multiplied by a form factor. The radii are calculated according to the following formula: r = a / 2 · f, where r is the radius of the profile feature, a is the width of the profile feature at the point where the radius starts and f is the shape factor. The form factor f is a constant and is always 1.1.

According to a preferred embodiment, all profile features on the outer surface have a convex shape and the variable profile features on the inner surface have a concave shape. To give all profile features on the outside a convex shape is necessary to disguise the minimal profiling.

In this case, the maxima of the radii should - according to a further embodiment - be formed centrically to the respective profile feature. All profile features are constructed in such a way that they run symmetrically and at right angles to the imaginary key center plane relative to the profile central axis. For technical reasons, all profile features have a profile angle α of 3 °. This profile angle is also symmetrical to the profile center axis.

For variable profile features that have an adjacent, fixed profile feature closer to the key midplane, the radius is performed as a quarter circle with the center of the radius on the extended line of the fixed profile feature. The radius is also calculated here according to the formula r = a / 2 · f; where a = b · 2 here. The value b denotes the distance between the transition of the variable profile feature into its radius, and the intersection of a line parallel to the key mid-plane, which is the extended line of the fixed profile feature below the profile angle α.

The invention will be explained below with reference to the embodiment shown in the drawing.

Showing:

1 a schematic cross section through a lock cylinder core with located in the keyway, congruent key.,

2 the detail X and

3 the detail Y.

The cylinder core is in the illustration with 1 designated. The with the reference number 2 provided lines reflect the maximum key width.

The key has different profile characteristics, and these are variable profile features 3 (enlarged in detail X) and fixed profile features with 4 designated and in detail Y are shown enlarged.

The fixed profile features 4 are characterized by straight profile surfaces on the profile base, being referred to as inner surfaces of the profile base, so the surface which is located close to the key center plane. Accordingly, the outer surface of the wall of the keyway is assigned.

The further reference numbers relate to:

LIST OF REFERENCE NUMBERS

5

 Symmetry line of the profile features; perpendicular to the key center plane.

6

 The center of the radius lies on the symmetry line of the profile feature.

7

 variable profile feature that adjoins a fixed profile feature.

8th

 extended, virtual line of the fixed profile feature

9

 intersection

The scanning of radii is much more difficult than from straight surfaces and requires at least additional settings or intervention by CAD or on the copying machine, anyway, the detection of radii is problematic and can easily lead to incorrect keys when copying.

Claims (5)

Key profile for flat key, which is formed on the side surfaces of the key shank and with a corresponding profiling in the keyway of a cylinder housing rotatably mounted in the lock cylinder housing ( 1 ), characterized in that the profiling is variable ( 3 ) and fixed ( 4 ) Profile features and that the fixed profile features ( 4 ) straight profile surfaces in the key base and the fixed ( 4 ) and variable ( 3 ) Profile surfaces have radii on the outside of the key. Key profile according to claim 1, characterized in that the radii of the variable profile features ( 3 ) are dependent on the width of the profile features at the respective layers multiplied by a form factor, the radii computed according to the following formula: r = a / 2 * f, where r is the radius of the profile feature, a is the width of the profile feature at the Place where the radius attaches and f is the form factor, which is a constant and is 1.1. Key profile according to one of the preceding claims, characterized in that the radii are formed centrally to the respective profile feature, wherein they run symmetrically and relative to the profile center axis at right angles to the imaginary key center plane. Key profile according to one of the preceding claims, characterized in that with variable profile features ( 7 ), which have an adjacent fixed profile feature closer to the key mid-plane, the radius is designed as a quarter-circle, the center of the radius being on the extended line (FIG. 8th ) of the fixed profile feature ( 4 ), and the radius is also given by the formula r = a / 2 · f; where a = b * 2, and where b is the distance between the transition of the variable profile feature ( 3 ) in its radius and the point of intersection ( 9 ) a line parallel to the key mid-plane, which indicates the extended line of the fixed profile feature ( 4 ) is below the profile angle α. Key profile according to one of the preceding claims, characterized in that the profile angle α = 3 °.

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