EP3514304B1 - Flat key profile for a lock and key system - Google Patents

Description

The invention relates to a flat key profile for a lock-key system, in which a key channel corresponding to the key profile is provided in the lock cylinder. Such a flat key profile is, for example, from DE 43 04 604 A1 known.

The term flat key is also understood to mean rib profile key or locking rib profile key, i.e. those profiles in which ribs protrude over the key side surface.

Keys are counterfeited or copied for a wide variety of reasons, although a distinction must be made between legal and illegal.

Copying is made more difficult by such key profiles or should at least be made more difficult because they are protected profiles, i.e. those that have been granted patent or utility model protection.

Such keys can be reordered from the lock manufacturer or authorized key services.

On the other hand, it is known that key services are also able, through the use of copying machines, to produce duplicate keys that have profiles that are protected per se.

However, there are profiles for which this is not so easy and therefore an attempt is made to approximate the actual profile by simplifying it. This includes, for example, the shape of the side profile grooves.

In commercial copying machines, a thin circular saw blade is used which can only make right-angled cuts in the key. If V-shaped incisions are required for the copy, only a rectangular incision can be made as a substitute.

The object of the invention is to make it more difficult for a key profile to be copied by machine.

• dass das Schlüsselprofil des Schlüsselschaftes einen dem Schlüsselrücken zugewandten oberen Profilabschnitt und einen der Schlüsselbrust zugewandten unteren Profilabschnitt aufweist,
• dass ausgehend von der Schlüsselbrust in der Schlüsselschaftebene in den unteren Profilabschnitt ragende Kerben vorgesehen sind,
• dass im unteren Profilabschnitt in der einen Seitenfläche des Schlüsselschaftes eine dreieckförmige, die Mittelebene des Schlüsselschaftes überragende, parazentrische Profilnut 2 vorgesehen ist,
• dass auf der gegenüberliegenden Seitenfläche des Schlüsselschaftes eine oberhalb oder eine unterhalb der gegenüberliegenden parazentrischen Profilnut angeordnete, dreieckförmige Profilnut vorgesehen ist, deren Profilgrund einen horizontalen Abstand zum Profilgrund der gegenüberliegenden parazentrischen Profilnut hat,
• dass die Anordnung der parazentrischen Profilnut bezogen auf die gegenüber liegenden Profilnuten derart ist, dass eine gedachte Linie die senkrecht zur Schlüsselschaftebene vom Schnittpunkt des oberen oder unteren Schenkels der parazentrischen Profilnut mit der Schlüsselseitenfläche zur gegenüberliegenden Profilnut verläuft, zu einer gedachten Linie die sich vom Schnittpunkt des oberen oder unteren Schenkels der gegenüberliegenden Profilnut mit der Schlüsselseitenfläche bis zur parazentrischen Profilnut erstreckt, einen vertikale Abstand hat.
• dass die parazentrische dreieckförmige Profilnut mindestens einen Absatz im oberen Schenkel aufweist, dem ein Absatz im unteren Schenkel der gegenüber liegenden oberen dreieckförmigen Profilnut zugeordnet ist, oder im unteren Schenkel aufweist, dem ein Absatz im oberen Schenkel der gegenüber liegenden unteren dreieckförmige Profilnut zugeordnet ist, und wobei der Absatz an einem gedachten Schnittpunkt der dreieckförmigen Profilnut mit der Schlüssel Außenfläche beginnt und eine Mindesttiefe von 1/3 der dreieckförmige Profilnut aufweist.

This object is achieved according to the invention by a flat key profile for a lock-key system in which a key channel corresponding to the key profile is provided in the lock cylinder,
thereby,

• that the key profile of the key shank has an upper profile section facing the key back and a lower profile section facing the key face,
• that starting from the key face in the key shank plane in the lower profile section protruding notches are provided,
• that in the lower profile section in one side surface of the key shank a triangular paracentric profile groove 2 projecting above the center plane of the key shank is provided,
• that on the opposite side surface of the key shaft a triangular profile groove is provided above or below the opposite paracentric profile groove, the profile base of which has a horizontal distance from the profile base of the opposite paracentric profile groove
• that the arrangement of the paracentric profile groove in relation to the opposite profile grooves is such that an imaginary line that runs perpendicular to the key shank plane from the intersection of the upper or lower leg of the paracentric profile groove with the key side surface to the opposite profile groove, to an imaginary line that extends from the intersection of the upper or lower leg of the opposite profile groove with the key side surface extending to the paracentric profile groove, has a vertical distance.
• that the paracentric triangular profile groove has at least one shoulder in the upper leg to which a shoulder in the lower leg of the opposite upper triangular profile groove is assigned, or in the lower leg to which a shoulder in the upper leg of the opposite lower triangular profile groove is assigned, and wherein the paragraph begins at an imaginary intersection of the triangular profile groove with the key outer surface and has a minimum depth of 1/3 of the triangular profile groove.

Preferred configurations result from the subclaims.

Two opposing profile features that are triangular (V-shaped) are used. The profile features are symmetrical and have radii in their base.

If two opposing features are now arranged in such a way that they come very close to one another when the profiles are milled at right angles, then the key would break in this area. The minimum overlap should be 0.2mm and the maximum remaining thickness 0.3mm. In order to be able to produce the triangular incisions (profile features) economically, the deeper incision should have an angle of a = 110 °.

There must be at least two incisions that are offset from one another. Starting from the deeper incision, there must be another incision either "above" or "below" this.

Since - as mentioned above - the copying machine with a rectangular milling disk cannot produce a V-shaped profile groove, the profile groove has to be milled rectangularly as a replacement, which inevitably makes it wider.

Since, according to the invention, further interrelationships or features of the arrangement have to be observed, this leads to the key shaft becoming too thin at certain points, so that it breaks during the copying process or at the latest during use.

The disadvantage of mechanical profile copying machines is thus exploited, so that the copied key cannot be used.

Copying with filament 3D printers is also made much more difficult by the bevels, since the bevels can only be created in steps.

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

• Fig. 1 eine Teilseitenansicht eines Schlüssels mit Reide und profiliertem Schaft,
• Fig. 2 einen Querschnitt durch den profilierten Schaft und
• Fig. 3 eine erfindungsgemäß Ausführung im Querschnitt.

It shows:

• Fig. 1 a partial side view of a key with bow and profiled shaft,
• Fig. 2 a cross section through the profiled shaft and
• Fig. 3 an embodiment according to the invention in cross section.

The key shaft is labeled 1. The deeper profile groove 2, which extends paracentrically over the central plane, starts from the key side surface. The profile groove 2 is symmetrical and has the angle a. Likewise, the profile grooves are formed "above" and "below" the profile groove 2 on the other side of the key. These are marked 3 and 4 and have an angle b. There is a radius (R) at the bottom of the incisions. A rectangle is drawn around the three incisions with dashed lines 5, 6, 7, which represents the right-angled incisions by means of a mechanical profile copying machine.

In detail, the arrangement of the paracentric profile groove in relation to the opposing profile grooves is such that an imaginary line 7 perpendicular to the key shank plane runs from the intersection of the upper or lower leg of the paracentric profile groove with the key side surface to the opposite profile groove, to an imaginary line 5, which extends from the intersection of the upper or lower leg of the opposite profile groove with the key side surface to the paracentric profile groove, has a vertical distance 9 .

This results in horizontal and vertical distances. The horizontal distance 8 should be a maximum of 0.3 mm, the vertical overlap 9 a minimum of 0.2 mm.

The angle a from the deeper incision should be 110 °. The radius R should be 0.2mm. The angle b is freely selectable according to the distances 8 and 9. The incisions (profile features) should preferably be in the "lower" area of the key, that is to say in which - starting from the key face - notches are made.

Claims (9)

1. Flat key profile for a lock-key system, in which a key channel corresponding to the key profile is provided in the lock cylinder,

   - the key profile of the key shank having an upper profile portion facing the key back and a lower profile portion facing the key face,

   - notches being provided which project into the lower profile portion starting from the key face in the key shank plane,

   - a triangular, paracentric profile groove (2) that projects above the centre plane of the key shank being provided in the lower profile portion in one side surface of the key shank,

   - a triangular profile groove (3; 4) arranged above or below the opposite paracentric profile groove (2) being provided on the opposite side surface of the key shank, the profile base of which profile groove is at a horizontal distance (8) from the profile base of the opposite paracentric profile groove,

   - the arrangement of the paracentric profile groove in relation to the opposite profile grooves being such that an imaginary line (7) which extends perpendicularly with respect to the key shank plane from the point of intersection of the upper or lower leg of the paracentric profile groove with the key side surface to the opposing profile groove is at a vertical distance (9) from an imaginary line (5) which extends from the point of intersection of the upper or lower leg of the opposite profile groove with the key side surface to the paracentric profile groove,

   - characterised in that

   - the paracentric triangular profile groove (2) has at least one shoulder (13) in the upper leg with which a shoulder (10) in the lower leg of the opposite upper triangular profile groove (3) is associated, or at least one shoulder (12) in the lower leg with which a shoulder (11) in the upper leg of the opposite lower triangular profile groove (4) is associated,

   - the shoulder beginning at an imaginary point of intersection of the triangular profile groove with the key outer surface and having a minimum depth of 1/3 of the triangular profile groove.
2. Flat key profile according to claim 1, characterised in that the depth of individual notches extends to the bottom of the lowest profile groove facing the key face.
3. Flat key profile according to claim 1, characterised in that the profile grooves (2-4) have a radius (R) in the profile base.
4. Flat key according to any of the preceding claims, characterised in that the angle a between the leg of the paracentric profile groove (2) and the key side surface is 110°.
5. Flat key according to any of the preceding claims, characterised in that the angle b between the leg of the opposite profile groove and the key side surface is variable and is 130° ≥ b ≥ 100°.
6. Flat key profile according to any of the preceding claims, characterised in that the horizontal distance (8) is a maximum of 0.3 mm and the vertical overlap (9) is a minimum of 0.2 mm.
7. Flat key profile according to any of the preceding claims, characterised in that the shoulders (10-13) have a symmetrical or asymmetrical depth.
8. Flat key profile according to any of the preceding claims, characterised in that a profile groove is provided above and below the opposite paracentric profile groove.
9. Flat key profile according to any of the preceding claims, characterised in that shoulders (10-13) are provided on all the triangular profile grooves.

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