Flat key profile for a lock-key system

Abstract

The invention relates to a flat key profile for a lock and key system in which a key channel corresponding to the key profile is provided in the lock cylinder. In this case, the key profile of the key shank facing the key back upper profile section and a key face facing the lower profile section, wherein in the lower profile section in a side surface of the key shank a triangular, the center plane of the key shank superior, paracentric profile groove (2) provided on the opposite side surface of the key shank one above or below the opposite paracentric profile groove (2) arranged, triangular profile groove (3; 4) is provided, the arrangement of the paracentric profile groove relative to the opposite profile groove is such that an imaginary line (7), the vertical to the keychain 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 extends, to an imaginary line (5) extending from the intersection of the upper or lower leg of the opposite profile groove with the key side surface extends to the paracentric profile groove, a vertical distance (9).

Claims

1. A key comprising: a key shank having a length extending from a key head to a key shank end, said key shank having a profile which is a cross-section taken perpendicularly through said length; a triangular paracentric profile groove formed in the profile of said key shank that has an open end at a first outer edge of said profile and a closed end that extends over a longitudinal center plane of said key shank; a triangular profile groove formed in said key shank that has an open end at a second outer edge of said profile of said key shank, opposite to said first outer edge, and a closed end that does not extend over said longitudinal center plane of said key shank, wherein the closed end of said triangular profile groove is at a horizontal distance from the closed end of said triangular paracentric profile groove, horizontal being defined as extending between said first and second outer edges, and wherein a first junction of the open end of said triangular paracentric profile groove and said first outer edge is at a vertical distance from a second junction of the open end of said triangular profile groove and said second outer edge; a first shoulder formed at said first junction comprising a first horizontal leg that extends from said first outer edge towards said longitudinal center plane of said key shank and a first vertical leg extending perpendicularly from said first horizontal leg; and a second shoulder formed at said second junction comprising a second horizontal leg that extends from said second outer edge towards said longitudinal center plane of said key shank and a second vertical leg extending perpendicularly from said second horizontal leg.

2. The key according to claim 1, wherein said second shoulder has a depth at least one third of a depth of said triangular profile groove, the depths being defined from said second outer edge towards said longitudinal center plane of said key shank.

3. The key according to claim 1, wherein said closed end of said triangular paracentric profile groove is curved.

4. The key according to claim 1, wherein said closed end of said triangular profile groove is curved.

5. The key according to claim 1, wherein an angle between legs of said triangular paracentric profile groove and said first outer edge is 110°.

6. The key according to claim 1, wherein an angle between legs of said triangular profile groove and said second outer edge is from 100° to 130°.

7. The key according to claim 1, wherein the horizontal distance is at most 0.3 mm and the vertical distance is at least 0.2 mm.

Description

(1) The invention will be explained in more detail with reference to the drawings.

(2) Showing:

(3) FIG. 1 a partial side view of a key with head and profiled shaft,

(4) FIG. 2 a cross section through the profiled shaft and

(5) FIG. 3 a modified embodiment in cross section.

(6) The key shaft is labeled 1. From the key side surface, the deeper profile groove 2 goes out, which extends paracentrally over the median plane. The profile groove 2 is formed symmetrically and has the angle alpha (α). Likewise, the profile grooves are formed “over” and “under” the profile groove 2 on the other key side. These are marked 3 and 4 and have an angle beta (β). At the bottom of the incisions, there is a radius (R). To the three incisions each with dashed lines 5, 6, 7 is drawn a rectangle that represents the rectangular incisions by means of a mechanical profile copying machine.

(7) In detail, the arrangement of the paracentric profile groove with respect to the opposite profile grooves is such that an imaginary line 7, perpendicular to the key 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 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, a vertical distance 9 has.

(8) This results in horizontal and vertical distances. The horizontal distance 8 should be a maximum of 0.3 mm, the vertical coverage 9 minimum 0.2 mm. The angle alpha from the deeper incision should be 110°. The radius R should be 0.2 mm. The angle beta is freely selectable according to the distances 8 and 9. The incisions (profile features) should preferably lie in the “lower” area of the key, ie in which—starting from the key breast—is notched.