DE8800988U1 - Flat key - Google Patents

Description

Registrant!

Kraft & Gauglitz OHG
RotebÜhlplatz 35B
7000 Stuttgart-1

2421 006 27,01,1987 H/m2
Title: Flat Key 1

Description 1

I The invention relates to a flat key with a handle part g

and a key shaft with a profiled cross-section | for insertion into the key channel of a locking cylinder |

and with cut tracks in the profiled |

Key shaft. ¥

In a flat key known from DE-OS 27 45 747, the cutting tracks, four in total, are each led to the § key centre plane. They are cut with end mills or
Angle cutters according to the arrangement and design of the
Locking plates milled. Depending on the size of the

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Diameter of the cutter, the cutting paths can only be made with rounded edges. Furthermore, the cutter must often be reground in order to maintain exact corner contours in the key center.

In order to avoid the disadvantages described, the present

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m &igr; iiiuuus uxc nui _B oifs ^ue<unu« SIiISTI &Ggr; ISGilSC.TiLJSSSi SSi ClHgSHgS so that the individual incision paths can be designed largely freely in their shape and, in particular, sharp-edged contours of the incision paths with narrow, precise transitions can be produced quickly and easily.

&rgr; To solve this problem, the invention provides that !

at least the profiled key shaft is made up of at least two flat parts. that the cutting tracks are attached to at least two of the flat parts separated during processing and that after the cutting tracks have been finished, the flat parts are firmly connected to one another.

By separating the flat parts, the cutting paths can be produced very precisely and individually by milling or grinding across the key shaft, whereby after the flat parts have been joined together, exact

Corner transitions on the non-free cut side panels I

are guaranteed. Tool wear when machining the cutting paths is minimal. The tools themselves can be guided very stably with little springing, which is

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This is difficult to achieve with the commonly used end mills due to the high cutting force in the vertical direction to the cutting path planes. Because the diameter of the milling or grinding tools used is not limited by the geometry of the cutting paths, very precise machining can be achieved with high machining ^speeds and relatively low machining forces.

An unmistakable pairing of the flat parts can be ensured by pivoting them together in the area of their handles, e.g. by a rivet, and by firmly connecting the free ends after the cutting paths have been finished, e.g. by a rivet, by soldering and/or welding, in particular by spot welding or by gluing.

Particularly advantageously, three flat parts can be provided, in which case the middle flat part serves as a web part and the incision tracks are preferably provided in the two outer flat parts.

Efficient, material-saving production can be achieved by forming one or more longitudinal grooves in the outer flat parts by deformation.

Further embodiments according to the invention can be found in the dependent claims and are explained with their advantages on the basis of

attached £tii «·* riungeft in the following description height»* explained, It shows!

Figure 1 a flat key with opposing

swiveled for flat parts

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interconnected flat parts;

Figure 3 shows a section through the connection point of the

Flat parts along the line ÜI-Ül in Figure and

Figure 4 shows a section through the key shaft of a

: other embodiment of a key with

i, bridge part.

In the embodiments described below, the same reference numerals are used for corresponding parts. The flat key shown in Figures 1 to 3 consists of two flat key parts 1, 1', which are pivotally connected to one another at their handle parts 2, 2' via a rivet 3. In the area of their key shaft 4, 4', in the pivoted-apart state shown in Figure 1 or in the case of individual flat parts 1, 1', incision paths 5 are produced by cross-milling with disk milling cutters in accordance with the arrangement of the locking plates or pins in a locking cylinder.

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After the finished machining of the incision paths 5, the flat parts 1, 1", which are provided with a through hole 6, 6' at their tip, are pivoted over one another and, as shown in Figure 3, firmly connected to one another by a rivet 7. ^To increase the strength, the flat parts 1, 1' can also or additionally be glued to one another. The course of the incision paths 5 can be in the individual key shafts 4,4' |

completely independent even with any overlap 1

getting produced.

In the exemplary embodiment, only the flat part 1 is provided with a longitudinal groove 8 in the area of the key shaft 4, whereby the rivet 7 is also deformed according to the longitudinal groove 8.

The flat key shown in section in Figure 4 consists of two outer sheet metal parts 1, 1' and a web part ₁ ' ¹ between them. This web part ^{1 1} ' is wider in the area of the key shaft 4' ¹ than the key shafts 4, 4' of the flat parts 1, 1', so that precise guidance is possible in the locking cylinder. The four incision tracks 5, 5* can be of practically any shape within wide limits and several longitudinal grooves 8, 8' can also be provided, possibly even asymmetrically offset, whereby these longitudinal grooves can be produced by milling or by embossing.

Claims (7)

Protection claims 1. Flat key with a handle part (2, 2 ^' ) and a key shaft (4, 4 ^' , ⁴ '), which has a profiled cross-section for insertion into the key channel of a locking cylinder and with cut paths (5) in the profiled key shaft ( 4, ^4' , ⁴ '), characterized in that at least the profiled key shaft (4) is composed of at least two flat parts (1, 1', ¹ '), that the cut paths (5) are introduced into at least two of the flat parts (1, ^1' , 1 ^' ) separated during machining, and that after the cut paths (5) have been finished, the flat parts (1, 1', 1') are firmly connected to one another. Z. Flat key according to claim 1, characterized in that the flat parts (1, 1", ¹ ') are pivotally connected to one another in the region of their handle parts (2, 2'), preferably by a rivet (3), and that the free ends are firmly connected to one another after the finished machining of the incision tracks (5). 3. Flat key according to claim 1 or 2, characterized in that the fixed connection of the free ends of the flat parts (1, 1', 1' ¹ ) is formed by a rivet (7), by soldering and/or welding. -"&Iacgr; 4. Flat key according to one of claims 1 to 3, characterized in that the flat parts (1, 1', 1'') are glued together after the finished machining of the incision tracks (5). 5. Flat key according to one of claims 1 to 4, characterized in that three flat parts (1, 1', 1'') are provided, and that the middle flat part serves as a web part (1'') and that the incision tracks (5) are preferably provided in the two outer flat parts (1, 1 '). 6. Flat key according to one of claims 1 to 5, characterized in that at least one of the outer flat parts (1. 1') is provided with at least one longitudinal groove (8, 8'). 7. Flat key according to claim 6, characterized in that the longitudinal groove (8, 8') or longitudinal grooves (8, 8') are formed by a deformation of the flat part (1, 1'). .· Il (I Il Il ''.", &bull; 4 *· «4 Il Il ** « ·