DD295205B5 - Key profile arrangement for flat keys of cylinder locks - Google Patents

Description

For this 1 page drawings Field of application of the invention

The invention relates to a key profile arrangement for flat keys of cylinder locks, in which on the key broadsides grooves and ribs for locking system profile variation vbrgesehen and at least one groove is arranged paracentric.

Characteristic of the known state of the art

From DD 126 947 a key-lock combination is known, which is used for keys and locks of main locking systems application. In this case, a profile is used, in which both the base profile and the variable profile distributed over the effective for locking or unlocking key area and these two profiles are preferably provided nested. Two systems are offered, in which the parent key can be very simple or extremely complicated. In general, however, these solutions have the disadvantage of missing a center overlap, thereby facilitating unwanted scanning of the keychain. From EP 261 298 a flat key for cylinder locks is known, which may have such a center overlap over the entire profile range.

The invention is primarily characterized in that in the profile cross-section grid lines are provided in which optionally longitudinal grooves have been incorporated into the key material, which have different basic profiles:

a) a groove can emanate from the left key flat side and exceed the center line of the key cross section with a round bottom profile

b) a groove may originate from the right-hand key flat side and exceed the centerline of the key cross-section with a round bottom profile

c) small trapezoidal grooves are located on both sides within a row.

This solution makes it possible to arbitrarily combine the 3 Nutenanordnungen and thus to realize a wide variety of cross-sectional contours. However, the invention has the disadvantage that the line division in favor of a simpler system in the production does not optimally exploits the profile range, since the line boundaries must not be exceeded, and a limitation to the 3 Nutengrundelemente limits the arrangement variability.

Object of the invention

The invention has the goal to improve the space utilization of the profile area and to complicate the production of duplicate keys effectively with simple production.

Explanation of the essence of the invention

The invention has for its object to divide the profile area in three subregions with overlapping groove elements, in which each area meets certain requirements, such as high Nachsperr- and reliability, wide variety of variations and optimum accuracy through small tolerance ranges. According to the invention the object is achieved in that in the key chest area on both sides of the key broadsides opposite each one groove is provided with Mittenüberschneidung that in the key back area a geometrically unchanging groove without Mittenüberschneidung

is provided and that the variation range for the sub-profiles over the entire key area is distributed, wherein the grooves formed trapezoidal and located between the located in the keychain and the key back in the keyway a wide groove opposite to the other key broadside another wide groove. In this case, the grooves are formed in different widths, with different steep trapezoidal swings and with heels according to the developments listed in the dependent claims.

exemplary

The invention will be explained in more detail using an exemplary embodiment. In the drawing show

1 shows a conventional flat key in side view,

2 shows a key profile arrangement according to the invention for a higher-level key.

The key 1 shown in Figure 1 has a key shank 2 and a roof-shaped key tip 3, to allow the insertion of the key shank 2 in a key channel of a lock cylinder and the classification of Stiftzuhaltungen in a cylinder lock. Trapezoidal grooves N, A are provided on the wrench broad sides, which ribs are adjacent to ensure the key shank cross section. In Fig. 2, a relatively complicated key profile arrangement for a parent key is shown, i. tv, the sub keys are made with a simpler profile. The key profile is divided into 3 areas I, II, III, which are subject to different requirements.

In the area I, quasi in the key chest area, above the groove N1 and below the groove N2, both of which are formed as paracentric grooves (arrangement beyond the center line). Thus, the scanning of the key channel with appropriate tools from the outset extremely cumbersome. In the area Il is above the groove N3 and below the groove N4, both of which are designed as wide grooves and provided with paragraphs that act as variable profile elements. The grooves N3, N4 face each other with the groove N3 wider than the groove N4. This is achieved without consideration of the groove depth already by the fact that the trapezoidal legs of the groove N4 are formed steeper than the trapezoidal legs of the groove N3. In Figure 2, the trapezoidal legs of the groove N3 were provided with a pitch angle α of 30 ° and the trapezoidal legs of the groove N4 at an angle of 15 °. This change of angle complicates a reproduction by third parties with adapted tools. In the area III is below a groove A, which is designed so that it can take on a dual function. The main purpose of this groove A is to create near the spine area a uniform position determining element, which ensures high accuracy and ease of processing and testing during manufacture. The invention allows such a profile cross section a variation for the sub-profiles over the entire key area and high security against unauthorized production of replicas. The profile cross section also ensures the application of a proven design principle that reduce the unwanted grinding of ribs and groove elements to produce a Nachschlüssels the cross sections so that the reliability of a key is no longer given.

Claims (4)

claims: 1. Key profile arrangement for flat keys of cylinder locks, in which on the key broadside grooves (N1 to N4, A) and ribs for locking system profile variation are provided, wherein in the key breast area (I) on both sides of the key broadsides opposite each one groove (N 1, N2 ) with center intersection and in the key back region (III) a geometrically invariable groove (A) are provided without center overlap and thereby the grooves (A, N1 to N4) have a trapezoidal ^ design, characterized in that on one key broadside between the key in the chest ( I) groove (N2) and located in the key back region (III) groove (A) in the region (II) a wide groove (N4) is provided, which is assigned on the other key broadside another wide groove (N3) directly opposite and that the variation range for the sub-profiles over the entire key range (N1 , N3, N2, N4, A) is distributed. 2. key profile assembly according to claim 1, characterized in that the wide groove (N3) is narrower than the wide groove (N4) and contains paragraphs. 3. key profile assembly according to claim 1, characterized in that the trapezoidal limbs of the groove (N3) are steeper than the trapezoidal limbs of the groove (N4). 4. key profile arrangement according to claim 1, characterized in that the trapezoidal limbs of the grooves (N1 to N4, A) are partially formed at an angle of 30 ° or 60 °, but within a groove with the same angle.