DE3036982A1 - Inexpensive mfr. of key blanks for cylinder locks - where profiled grooves are rolled into both sides of metal strip, which is then stamped to make blanks - Google Patents

Abstract

A metal strip is made with a rectangular cross-section is made from steel, brass, or other metals; and the strip is rolled on both sides to obtain profiled grooves corresp. to the key profiles inside the lock cylinder. The strip is then stamped to produce key blanks. Instead of rolling, the strip may be milled on both sides to form the grooves; and the initial strip can be made by casting. Another pref. alternative method of forming the profiled grooves is to extrude the initial strip through a die. Mass prodn. of key blanks at very low cost is obtd.

Description

- Process for the non-cutting production of cylinder keys Punching out of prefabricated profiles - process for machining HE production of cylinder keys by punching out of prefabricated profiles -The invention refers to a manufacturing process according to which angular raw material is so is profiled that the punching out of the key shape a finished, with key profile provided blank results.

People's increased need for security has led to the fact that instead of of the tumbler and tumbler locks that were mainly used up to now, in increased Circumference cylinder locks are used. This requires very high production numbers which the previous manufacturing processes according to the number of pieces, but above all the After economic viability, have no longer grown.

According to the methods known up to now, straight band material is made Key shapes punched out. These diecuts are then mostly combined in complex process in the area of the key channel milled and embossed on both sides. So far, the key profile has not run across the entire key but only goes up to the stop, so the profile is the length of the associated Lock cylinder core corresponds in each case.

In contrast, the subject matter of the invention is continuous application of the key profile on angular raw material according to various processes.

Figure 1 Shows the tape in side view.

Figure 2 shows the ribbon in plan view, the key shapes are indicated.

Accordingly, the desired key profile now runs over the So the whole band also over the whole key without its function somehow to affect.

Several methods are known for producing these profiles. in the For reasons of economy, the focus is on both sides.

Rolled material would be reasonably priced as raw material in useful Lengths available. Stamping and embossing could be done in a single, subsequent one Work done and thereby significantly cheaper the key blank.

The same meaning would have the drawing of the material such as e.g. in wire production.

Two-sided cutting milling is another method at.

Here the difference compared to the previous method lies in the endless, continuous processing - continuous in one operation is possible.

This is also only followed by the punching and embossing process.

Since the number of cylinder key blanks depends on the Awareness of the cylinder lock manufacturers producing both of the above could be Procedures are applied side by side. In one cell with frequently recurring The rolling process could be used for profiles because the rolling process determined Requires minimum quantities of rolling weight. Otherwise with smaller quantities the milling process could be used.

Continuous profile milling still results compared to the previous ones Process considerable simplification and economy.

However, the invention is not limited to the two aforementioned and described procedures. Rather, all procedures can be pre-profiled result in the sense described.

Accordingly, the claims extend to 1-6.

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Claims (1)

Claims: Method characterized in that from previously continuously profiled strip material in one operation. Key blanks for cylinder locks can be punched out. Claim method for producing cylinder keys thereby marked, rectangular-flat strip material (strip steel, strip brass, stamped strip o.ä.) by bilateral we e 1 z e n to be profiled in such a way that it corresponds to the profile of the respective Corresponds to the key channel in the cylinder and after punching a finished key blank results. Claim 2: Method according to Claim 1, however, characterized in that that continuous strip material is profiled accordingly by milling on both sides will. Claim 3: Method according to Claim 1, however, by analogous production of raw material in the casting process. Claim 4: The method according to claim 1, however, by producing the Profiles in S t r a n g p r e ß v e r f a h r e n. Claim 5: Process that lead to the production of profiles that in the same way as claim 1 can be used as the starting material. Claim 6s Claims 1 to 5 extend to all materials which are suitable and used for the production of cylinder keys can