NZ810823B2

NZ810823B2 - Flat key for a locking cylinder

Info

Publication number: NZ810823B2
Application number: NZ810823A
Authority: NZ
Inventors: Markus Kornhofer; Heinz Navratil
Original assignee: Dormakaba Austria Gmbh
Filing date: 2022-11-11
Publication date: 2025-07-01

Abstract

flat key (1) for a locking cylinder (101) has substantially flat and approximately parallel flat key sides (2', 3'), a key rear section (4), and a key front section (5) opposite thereto. The key front section (5) has a toothing that is used to position tumbler pins which are divided into core pins (112) and housing pins (111) and which are spring-loaded against the key front section (5) in the direction of the key rear section (4) and into corresponding bores. Grooves (11', 12', 13', 14', 20'-25') in the form of profiled variation elements and profiled guiding elements are provided in the flat sides (2', 3') of the flat key (1), wherein at least two grooves (11', 12) of one flat side (3') of the flat key (1), which are preferably part of the profiled guide, overlap and are undercut in opposite directions. According to the invention, a depression (15', 16') is provided in the outer flank (11a', 12a') of at least one of the two grooves (11', 12'), preferably both grooves (11', 12'), at least one region (15b, 16b) of said depression not being visible from the side. The two depressions (15', 16') are preferably symmetrical so that the depressions can be produced using a T-slot milling cutter (60). Such flat keys (1) cannot be completely measured from the side even when using a laser scanner but can still be produced solely by milling.

Claims

1. A flat key for a locking cylinder, in particular for locking systems, having substantially flat and approximately parallel flat key sides, a key rear section, and a key front section opposite thereto, toothed on an end face, for positioning tumbler pins divided into core pins 5 and housing pins, which are spring-loaded in corresponding key channels of cylinder cores against the key front section in the direction of the key rear section, wherein grooves in the form of profiled variation elements and profiled guiding elements are provided in the flat sides of the flat key, wherein at least two grooves of one flat side of the flat key overlap and are undercut in opposite directions, wherein a depression is provided in an outer flank of at 10 least one of the two grooves, and in that at least one region of said depression is not visible from a side.

2. A key blank for a flat key for a locking cylinder, in particular for locking systems, having substantially flat and approximately parallel flat key sides, a key rear section, and a 15 key front section, wherein grooves in the form of profiled guiding elements are provided in the flat sides of the key blank, wherein at least two grooves of one side of the key blank overlap and are undercut in opposite directions, wherein a depression is provided in an outer flank of at least one of the two grooves, and in that at least one region of said depression is not visible from the outside.

3. The flat key according to claim 1 or the key blank according to claim 2, wherein in addition to the two oppositely undercut grooves, a further groove is provided on the opposite flat side, which overlaps with at least one of the two oppositely undercut grooves. 25

4. The flat key or key blank according to claim 3, wherein the two undercut grooves and the further groove are arranged in the central region of the two flat sides.

5. The flat key or key blank according to any one of claims 1 to 4, wherein the two undercut angles of the undercut grooves are different sizes.

6. The flat key or key blank according to any one of claims 1 to 5, wherein the depression is provided in the outer flank of both grooves.

7. The flat key or key blank according to claim 6, wherein the two depressions are 35 symmetrical, wherein an axis of symmetry lies in the open area of the two overlapping grooves, in particular in such a way that they can be produced with a T-slot milling cutter.

8. The flat key or key blank according to claim 7, wherein the axis of symmetry of the two depressions is at an oblique angle to a longitudinal center plane of the flat key or the blank. 5

9. The flat key or key blank according to any one of claims 1 to 8, wherein the depression(s) are designed like a groove with a round base.

10. A method for producing a key blank according to any one of claims 2 to 9, wherein the two undercut grooves are first produced and then the depression is milled into at least 10 one of the two undercut grooves using a T-slot milling cutter.

11. The method according to claim 10 for a flat key according to claim 6 or claim 7 and optionally 8, wherein the depression is milled simultaneously in each of the two undercut grooves using the T-slot milling cutter.

12. The method according to claim 10 or 11, wherein the T-slot milling cutter is guided at an acute or obtuse angle to a longitudinal center plane of the key blank.

13. A locking cylinder having a housing and a cylinder core which can be rotated in the 20 housing, wherein a key channel with two flat sides for inserting a suitable flat key according to claim 1 is provided in the cylinder core; wherein bores are provided in the housing which, in an initial position of the cylinder core, continue in alignment in the cylinder core into the key channel, wherein tumbler pins subdivided into core pins and housing pins are provided in these bores, which are positioned by serration cutouts of the suitable flat key such that a 25 pitch plane between the core pin and the housing pin of each tumbler pin lies at an edge of the cylinder core, so that the cylinder core can be rotated with the suitable flat key; wherein ribs are provided in the flat sides as profiled variation elements and as profiled guiding elements, wherein at least two ribs overlap on a flat side and are undercut in opposite directions, wherein an elevation is provided in an outer flank of at least one of the two ribs.

14. The locking cylinder according to claim 13 for a flat key according to claim 3, wherein in addition to the two oppositely undercut ribs, a further rib is provided on the opposite flat side, which overlaps with at least one of the two oppositely undercut ribs. 35

15. The locking cylinder according to claim 14 for a flat key according to claim 4, wherein the two undercut ribs and the further rib are arranged in the central region of the two flat sides, where head ends of the core pins lie.

16. The locking cylinder according to any one of claims 13 to 15 for a flat key according to claim 5, wherein the two undercut angles are different sizes.

17. The locking cylinder according to any one of claims 13 to 16 for a flat key according 5 to claim 6, wherein an elevation is provided on the outer flanks of both ribs.

18. The locking cylinder according to claim 17 for a flat key according to claim 7, wherein the two elevations are symmetrical. 10

19. The locking cylinder according to claim 18 for a flat key according to claim 8, wherein an axis of symmetry is at an oblique angle to a longitudinal center plane of the key channel.

20. The locking cylinder according to any one of claims 13 to 19 for a flat key according to claim 9, wherein the elevation(s) is(are) rounded on an outer side thereof.