SI21853A - Flat key for cylinder lock, procedure of its manufacture and cylinderlock - Google Patents

Abstract

Flat key (1', 1'') with generally even, almost parallel flat sides (2, 2'') where the grooves are applied (3, 3', 10, 11, 12'), which serve as variation profiles elements and as leading profiled elements. To avoid the phenomena of sharp-edge legs (22), which usually stand away from the central key surface, one leg (23) of groove (12') together with the central surface of the flat key (1') forms an angle between 30 and 45 degrees. The groove (12') is located next to the key-bit (9). The other flank (23') of the groove (12') with the flat key (1') central surface forms an angle between 93 and 97 degrees.

Description

Flat key for cylindrical lock, process for making it and cylindrical lock

The present invention relates to a flat key for cylindrical locks in substantially planim and substantially parallel sides of the flat key, with the back of the key and with, opposite to it, a serrated beard of the key for disposition on the pins of the core and the pins of the housing of the split retaining pins, which are suspended in the direction of the back of the key towards the edge of the beard of the key guided in the corresponding to the key-linked channels, the grooves being cut on the flat side of the flat key as variant profiled elements and as guiding profiled elements, and with at least one groove tied to the groove whose direction cuts is different from the groove direction, and the breakaway groove is arranged at a distance from the bottom of the groove, as well as to the process of making the flat key.

The invention further relates to a flat-key cylindrical lock in a housing of a rotatably cylindrical cylindrical core with an axial keyhole, radial holes in a cylindrical core extending into the housing, and in which two suspension and movable housing retaining pins are disposed in the direction of the keyhole and the retaining pins of the core, which are optionally divided into panels, wherein the cylindrical core from the key channel to the cylindrical mantle surface has a cutout where there are block pins with a tactile end that touches the flat side of the key while in the channel for the key provided ribs as profiled guiding elements, and from at least one rib a branch groove whose direction is different with respect to the direction of the rib, while at the distance from the bottom of the leading rib, a rib is provided.

Life protection, privacy and private property are highly rated. Hence the special attention given to locks and keys. General accesses are specified by general key systems so that one or more locks are accessed with each system key. The relevance or exclusion of the use of keys in locks when it comes to locking is achieved by means of cylindrical locks on flat keys with cross-sectioned key and cross-sectioned key channels. The key fits into the lock only if the outline of the cross section of the key channel matches the cross section of the key exactly or covers it. In case the cross-section of the flat key does not correspond to the cross-section of the key channel, the key is not given to block the cylindrical lock in question. This relationship in the case of profiles (cross section of a key, especially a flat one, and a keyhole in a cylindrical lock) between a key and a cylindrical lock also applies, of course, to single cylinders and single keys, which are not necessarily a direct part of the general key system. Security needs are met if it is not a simple task to fake a key. The duplicate of the key should only be made by a genuine manufacturer, taking into account security circumstances and strict identification. Considering the fact that key stock is being obtained in the market, key makers can easily make a duplicate key by using a copier milling machine with the production of teeth at the key beard. If, in addition, the copier can make a hole in the cross-section profile on the flat side of the original key and suitable milling tools are available, it is possible to make duplicate keys from sheet metal by cutting the technique. While the free market for duplicate key duplication has been hampered by the fact that there were not enough profiles because there were no suitable key blanks, today 's technology allows key makers not only to copy key perforation but also to produce key profiles. The key profile configuration is sensed mechanically or optically from the side. Thereafter, one or more milling heads produce U-, V- or u-grooves on the resulting mold. If the key blank is tilted, the grooves can also be angled with respect to the centerline of the profile cross section, such as undercut grooves.

The aforementioned profile system, known from EP 1 362 153 BI, in which the profile is made in one layout, is not possible with modem key milling devices available to key makers.

In the middle of the key cross section there is a paracentric guiding profile, and in the field in the direction of the beard of the key and the back of the key there is room for variation profiles. These boxes make it easy to modify slots and ribs to increase security against skimming and to establish a lock hierarchy in the general key system. In the beard key box, the standard flat wrenches have teeth that serve as the means of engagement with the corresponding cylinder lock.

If one of the flat sides in the direct field of the key beard has an axial groove, such as one with the flanks of the normal groove at the median plane of the key, sharp edges protrude laterally between the teeth of the tooth, projecting laterally over the median plane of the normal key. Because their width is small, sharp hooks can easily fly off or bend. This causes the cylinder lock to be locked or even disabled. Even the key user may be injured.

The object of the invention is to remedy the aforementioned disadvantage, and in addition to create a flat key having flat, milling-made grooves.

Said object according to the invention, for the pre-defined flat key, is achieved by the fact that at least the groove immediately adjacent to the beard of the key is a through groove whose one flank with the median plane of the flat wrench encloses an angle of less than 90 °, preferably between 30 ° and 45 °, and the other flank of which with the median plane of the flat key encloses a β of magnitude between 93 ° and 97 °. The relatively small inclination of the side of the groove in the direction of the flat side results in the beard of the key, when viewed in cross section, with ribs extending close to the beard of the key, and as a dam shaped contour without pointed tips of the flanks that would otherwise present a danger of the user is injured.

EP 1 362 153 BI also discloses a flat key which generally cannot be made with conventional duplicate milling machines. With conventional milling machines with a milling head, the profiled grooves are cut by moving the milling cutter laterally towards the flat side of the flat wrench and moving in the axial direction parallel to the flat wrench.

The possibility of using a conventional keyhole tool for copying a cylinder lock to open a cylinder lock according to EP 1 362 153 BI can be used when cutting a trimmed rib together with a profiled groove located behind a rib that partially covers the profiled groove. This kind of hacking tool is neither a copy of the original key nor a usable or allowed duplicate key, as this hacking tool can at most unlock / lock cylindrical locks within the general key system, for which there is no lock / lock exception. The cylindrical lock must determine whether an authorized (correct) key or a hacking tool is being used.

It is a further object of the invention to create a cylindrical lock whose described duplicates of the key and intrusion tools, which are different from the original key, do not unlock o / lock o.

This goal is achieved by introducing the cylindrical lock, which is initially defined by the fact that a cylindrical core towards the keyhole channel, which is initially a blind hole, from which the bottom is projected through the hole directly from the hole toward the keyhole, through which a block pin is inserted into the blind hole and a tactile pin is tightly connected to the hole through the block pin.

The locking pin is axially movable, but fixed in the hole when it rotates. Turning the locking pin in its hole would result in the end of the housing retaining pin no longer being aligned with the cylindrical face of the cylindrical core. Blocking pins can cause the core in the case to lock inadvertently, or cause the housing retaining pin to be unintentionally locked while rotating.

It is also advantageous that at least one further adjacent groove on the key beard has the features of claim 1.

In order to avoid sharp edge hooks in all the toothed field, it is further practical that all variation grooves in the field between the key beard and the middle groove guide grooves have the characteristics of claim 1.

It is advantageous for the block pins to consist of a first and a lateral second, circular cylinder located on the base surface of the circular cylinder, that the circular cylinders have different diameters so that the circular cylinder of the smaller diameter is the tactile end and the circular cylinder of the larger diameter is behind the block end.

The inventive placement of the locking pin is a guarantee that the locking pin does not rotate out of position, or even after repeatedly inserting and removing the flat key. At the same time, the twisted locking pins would protrude too far into the key channel with the aforementioned blocking and tilting in the end box at the housing side, so that no key could be inserted into the key channel, nor authorized.

It is practical to move the touching end of the locking pin into the groove of the undercut profile and to move it back from that profiled groove with the flat key with the undercut rib.

The touching end of the locking pin therefore lies directly in the undercut profiled groove / rib, thus ensuring that the cylindrical lock can only be unlocked / locked with an authorized key. The touch end hits that rib of the key being tested, determines its existence and does not break into the groove, which is too cut in the fake key.

The block pins preferably have a smaller diameter in the field of the tactile end to increase its reliability. This feature allows for more accurate key verification when used.

When milling the longitudinal groove and profile along the beard of the key, an unwanted burr (needle) may occur, making it difficult or preventing the key to be inserted into the cylindrical core. Said scab should be removed by proper surface treatment such as brushing or sandblasting. However, there is a lack of debris removal procedures as material is removed even where debris is absent. This again has a negative effect on maintaining all dimensions of the flat key as a whole.

This disadvantage is avoided by the method of the invention according to which the key blank has pre-defined grooves between 0.1 mm and 0.3 mm wide and between 0.05 mm and 0.2 mm deep on the planar sides in the axial direction. about 0.1 mm, which is then made in the flat sides and used to establish the axial variation grooves in the flat sides of the key blanks by moving the milling head of the milling machine back and forth on the flat key. The advantage of such a key blank is that it does not occur when milling the grooves and teeth, which would make it difficult to insert into the cylindrical core, since the material required on the key blank is no longer present. The flat key also has a high precision dimension on the rest of the surface, so any additional brushing or sandblasting is no longer required.

It is particularly advantageous if the grooves have a semicircular, trapezoidal or rectangular cross-section. The advantage of a trapezoid shaped groove is that a wider groove can be made at the existing groove floor and manufacturing tolerances, while milling profiles do not allow the appearance of unwanted flakes.

It is also preferred that there is a radius at the intersection of the flat sides and the sides of the grooves, or the junction of the flanks of the grooves and the bottom of the grooves. A flat key made from a key blank according to the invention thus obtains, in the junction between the sides of the slots and the flat sides of the flat key, by looking at the cross-section of the key, completely rounded outlines.

It is further preferred that the length of the radius corresponds to half the side of the groove.

If the key blank is cut on the flat side directly next to each other, the running grooves, whose bottoms are adjacent to each other, form the remaining junctions of the flanks of the grooves between the groove days along the flat key of the edge of the rib.

This disadvantage does not occur if the radius at each junction of the flat sides between the small flanks of the slots and the bottom of the groove is always provided. The remaining debris, which is the source of the damage, is removed when the milling head is pulled back, which undergoes a machining process.

Lastly, it is preferred that the length of the radius corresponds to half the side of the groove. This means saving money when changing gears.

An example of the manufacture of an object of the invention is illustrated in the accompanying drawings. There they show:

FIG. 1 detail of a standard flat key in a space presentation,

FIG. 2 shows a cut along line II-II of FIG. 1,

FIG. 3 and 4 examples of an inventive flat key, each in cross section,

FIG. 5 is a detail taken from FIG. 4,

FIG. 6 to 8, the inventive cylindrical lock, each in cross section, transversely to the longitudinal axis i.s. FIG. Fig. 6 shows the state with the key extracted, FIG. 7 shows the keyed state and FIG. 8 as in FIG. 7, but with a rotated cylindrical core,

FIG. 9 and 10 separately locking pins in a different embodiment,

FIG. 11 is a cylindrical lock in cross section, without key and movable pins, so that the lateral bearing branches of the cylindrical core are visible,

FIG. 12 is a cross-sectional key used in cross-section made from a key blank according to FIG. 13,

FIG. 13 key blank in cross section,

FIG. 14 flat key in outline projection,

FIG. 15 is a detail of a small groove according to FIG. 12, and

FIG. 16 is a variation of FIG. 15, when the small groove receives a trapezoidal cross-section.

Known plain flat keys 1 according to FIG. 1, 2 comprise guide grooves 3, 3 'in the middle field on substantially parallel planar sides 2, 2'. Fields upstream of the key 8 back and downstream of the key 9 beard are available for further guide grooves 4, 4 'and variation grooves 11, 12. In the key 9 beard field, both flat sides 2, 2' are downward toward the middle key plane oblique. The groove depths 3, 3 ', 4, 4', 11, 12 are usually about 0.6 mm to 0.8 mm.

Sketches FIG. 1, 2 show a flat key 1 having a groove 12 on the flat side 2 directly to the chin 9 passage, 9. The groove 12 has a bottom 26 and flanks 21, 21 ', which are generally generally at right angles to the central plane of the key. S FIG. 1, a bevelled toothed 20 can be seen along the beard 9 of the key, which, for example, in the direction of the flat side 2 can for example form a sharp-edged arm 22 having a flank 21 'of the groove and a groove 12.

Sketch of FIG. 3 shows, on the other side, an inventive flat key 1 'having somehow in its longitudinal center an overlapping guide profile with grooves 3, 3' extending at the center line of the profile. This kind of design fulfills the task of leading profile, ie. flat key Γ by positioning in the keyway covers the pins 37 of the core on the main side and prevents the cylinder lock 31 from being raped. The breakaway groove 3 starts at the lateral side of the groove 3 ′. The cutting direction when making groove 3 'is different from the cutting direction when making groove 3'. Thus, different machining directions require two machining operations and a key blank blank or a special imitation tool is required.

Sketch of FIG. 3 further shows the side 23 of the groove 12 ', which with the median plane of the flat wrench 1' encloses a angle of 45 °. The plane of the side 23 of the groove in the direction of the flat side 2 and chin 9 of the key allows the ribs 24 extending close to the chin 9 of the key, when viewed in its cross section, to be bluntly cut, i.e., the hips do not end with the tip. Variation grooves 11, 12 'are the actual grooves of flat key 1, while variation grooves 10 merely symbolize possible grooves that the machine did not produce.

The side 23 'of the groove is positioned at an angle β of 93 ° with respect to the median plane of the flat key 1'. Angles β measuring more than 90 °, preferably between 93 ° and 97 °, have the advantage of achieving greater overlap with possible adjacent grooves 10. This increases the number of possible grooves to 10 per flat side. The milling head to be used is also more passable, since if there is a risk of jamming, it is sufficient to keep the milling head away from the flat wrench Γ so that it no longer lies on the side of the 23 ′ groove and goes smoothly over.

In the case of flat key 1, the adjacent grooves 25 in FIG. 4, whose hips intersect at the distance between the days of the grooves, after milling, the remaining ribs remain 27. FIG. 5 shows an enlarged detail of such a rib 27. Since such ribs 27 present a risk of injury to the user of the flat wrench 1, if the milling head can be moved backwards, these ribs 27 are always removed by removing material with the milling head side, preferably the cutter side. bottom 26 slots.

The grooves 10, 11, 12 'having a bottom 26 extending inclined with respect to or parallel to the median plane of the key, the key with its large trough or trapezoidal shaped contact surfaces guide better than grooves with a triangular cross-section.

According to FIG. 3, 4, grooves 10, 12, 25 have a radius from the flanks 23, 23 'of the grooves to the bottom 26 to minimize the risk of the flat key Γ, 1 being stuck in the cylinder.

According to FIG. 6 comprises a cylindrical lock 31 in the housing 32 of a rotary core 33 with an axial groove 34 for the key. From the cylindrical core 33, the radial holes 35 are guided into the housing 34. The holes 35 contain suspension, movable housing retaining pins 36 and retaining pins 37 of the core. The cylindrical core 33 has in its cross-section through a cutout 39 for the retaining pin, driven from the channel 34 for the key against the sheath 38. From FIG. 6, it is seen that the recess 39 is formed by a bag hole 40 and a through hole 41, which laterally merges with the key channel 34 and is positioned extending substantially relative to the bottom of the hole. According to FIG. 6, the locking pin 42 is freely movable in the recess 39, which is pressed by the retaining pin 37 of the core when the flat key 43 is pulled out to the housing hole 44.

The locking pins 42 consist of a first cylinder 45 and a second cylinder 46, the cylinder 45 being positioned directly directly on the base surface of the cylinder 46. The cylinder 45 is inserted through the hole 41. The cylinder 46 is located in the bag hole 40. The cylinder 46 is arranged flat the base surface of the housing hole 44 on the opposite side of the housing hole 44, which represents the block end 47 of the locking pin 42, on the circular cylindrical jacket surface of the housing hole 44.

Before inserting the corresponding flat key 43 of FIG. 7 into the channel 34 for the key of the killed contour, the locking pin 42, as already explained, is in the backward-drawn position outside the channel 34 for the key from the retaining pin 47 of the core. The touching end 48 of the cylinder 45 does not touch the flat side of the flat key 43 or one of the ribs 49 when the key 43 is inserted into the key channel 44. This results in a particularly long service life of the locking pin 42.

FIG. 7 shows that, with the flat key 43 inserted, the retaining pin 37 of the core and the retaining retaining pin 46 are aligned with respect to the dividing plane between the housing 32 and the cylindrical core 33, so that turning of the cylindrical core, for example in the direction of arrow A, is possible.

There is a stroke X between the bottom of the blind hole 40 and the base surface of the cylinder 46. FIG. 7, however, the locking pin is not movable as it is held in place by the face of the flat key 43.

FIG. 8 shows a cylindrical core 33 rotated in a housing 32, using a forged key 43 '. Unlike flat wrench 43, flat wrench 43 'does not have ribs 49 but a milled field shaped like a profiled groove 50. If the cylindrical core 33 is rotated to the position of FIG. 8, the spring-supported housing retaining pin 36 can be moved into the bag hole 40 and the locking pins 43 are moved by stroke X in the direction of the flat key 43 '. This is possible since the counterfeit flat key 43 'of the rib 49 is absent and the tactile end 48 of the locking pin may sink into the profiled groove 50.

Turning the cylindrical core 33 is no longer possible since the housing of the retaining pin 36 is trapped in the bag hole 40.

In order to prevent such repetitive removal of the counterfeit flat key 43 ', it is practical to have a flattened cylindrical core 33 in line with line 51, since this facilitates the rotation of the cylindrical core back towards the direction of arrow A. The counterfeit key 43' can be re-removed by the beams .

Sketches FIG. 9, 10 show different locking pins 42 'once in side view, second in an axial direction which is flattened (flattening 52) to increase the touch reliability in the field of the tactile end 48'.

The block pin 42 is made very economically as part of a sintered hard metal.

According to FIG. 12, the leading grooves 3, 3 'are located in the middle field on substantially parallel planar sides 2, 2'. The fields above in the direction of the back 8 of the key and the fields below in the direction of the beard 9 of the key are available for further guide grooves 4 (FIG. 14), 4 'and variation grooves 10, 11. For variation slots 11 as shown in FIG. 12, these are grooves specifically made on flat wrench 1, while variation grooves 10 are groove options that have not yet been realized in the drawn state.

In the junction with the grooves of the derived lateral flanks 5 with the flat sides 2, 2 ', small grooves are provided 6. These small grooves 6 extend over the entire length of the flat sides 2, 2' of the flat wrench 1 and have a groove width between 0.1 mm and 0 , 3 mm and groove depth between 0.05 mm and 0.2 mm. In comparison, the grooves 10, 11 have a depth of about 0.6 mm to 0.8 mm. Preferred dimensions after machining small grooves 6, 6 'have a groove width of about 0.2 mm and groove depth of about 0.1 mm.

In a preferred embodiment, the small grooves 6 have a semicircular cross-section, the diameter corresponding to the desired groove width.

FIG. 13 shows an inventive blank 7 of a key with flat grooves 2, 2 'already made. 6. Small grooves 6, 6' are arranged on the respective flat side 2, 2 'at the intersection of the grooved side flanks 5 of the flat wrench 1 for possible variation grooves 3. , 3 ', 4, 4', 5, 5 ', 10, 11.

In FIG. 15 is a detail of this junction.

The purpose of the small grooves 6 is to prevent the occurrence of unwanted burrs when milling the key profile or variation grooves 3, 3 ', 4, 4', 5, 5 ', 10, 11 in the flat sides 2, 2' (if burrs occur, they are they lie within the planned contour of the key and do not cause problems). Scratches can have a detrimental effect on the unlocking / locking function of the flat key 1, so this device should definitely be subjected to a mechanical surface treatment, such as brushing or sandblasting, to remove scuffs.

In the creation of the invention, it has been shown that the flat key 1 is easily inserted into and removed from the non-displayed cylindrical lock if the small grooves 6, in addition to being a semicircular cross-section, flow into the respective flat side 2, 2 ' through rounding.

FIG. 16 shows an embodiment of FIG. 15, wherein the small groove 6 'has a trapezoidal cross-section and the intersections of the flat side 2 with the flanks 14 of the small grooves and the junctions of the small grooves 14 with the bottom of the 15 small grooves are rounded each time. The small groove 6 'obtains a larger groove width at the small bottom 15 grooves, which is necessary to prevent unwanted flakes that occur when cutting the teeth to the prescribed tolerances.

Claims (18)

Patent claims 1. Flat key for cylindrical locks in the general plan and substantially parallel flat sides of the key with the back of the key and with, on the opposite base face, a serrated beard of the key for positioning one from the other separate from the retaining pins of the core and retaining pins of the housing which are suspended in the corresponding key channel in the cylindrical core towards the edge of the beard of the key in the direction of the back of the key, wherein grooves are provided as profiled variation elements and profiled guiding elements, of which at least one groove in the flat key is provided with a cleavage groove , the direction of which differs from the direction of the groove, the breakaway groove being provided as a guide groove at a distance from the bottom of the groove, characterized in that it is at least in the groove (12 '), which is on the flat side (2) of the key directly in the field (9) key beard, for a trough groove, wherein the flank (23) of the groove (12 ') with the median plane of the flat key (Γ) curves as a sizes less than 90 °, preferably between 30 ° and 45 °, and the second flank (23 ') of the groove (12') with the median plane of the flat wrench (Γ) encloses as β sizes between 93 ° and 97 °. Flat key according to claim 1, characterized in that at least one further groove (10) adjacent to the key beard (9) has the characteristics specified in claim 1. Flat wrench according to claim 1, characterized in that all the variation grooves (10, 11) have in the field between the beard (9) of the key and the guide grooves (3) in the middle of the features of claim 1. Flat-plate cylindrical locks according to one of Claims 1 to 3 with a rotatable cylindrical core located in the housing with an axial keyhole and radial holes extending into the housing and in which there are two suspended locking holds in the direction of the keyhole. the pins of the housing and the retaining pins of the core and the retaining pins of the housing are optionally divided into tiles, the cylindrical core having a recess from the locking track to the outer mantle surface of the core into which a locking pin with a tactile end located on the side of the flat side of the key is inserted, the rib channel being provided with ribs as profile variation members and profiled guiding members, wherein at least one rib has a split rib whose direction is different from the rib direction and the twin rib is at a distance from the base of the guide rib, characterized in that a key hole (40) is made in the groove (34), a cutout (39) with respect to the axis of the hole, an extremely open hole (41) in the bottom of the hole, with a locking pin (42) inserted therein, a tangently arranged tactile end extending through the opening (41). Cylindrical locks according to Claim 4, characterized in that the ribs in the field of pins (37) of the core immediately adjacent to the bottom of the key channel are trapezoidal ribs, wherein the flank of the ribs with the median plane of the keyhole channels as a sizes less than 90 °, preferably between 30 ° and 45 °, and the second flank of the rib with the median plane of the keyhole arm encloses angle β of size between 93 ° and 97 °. Cylindrical locks according to claim 5, characterized in that at least one further variation rib in the bottom channel box for the key has the features of claim 5. Cylindrical locks according to claim 5, characterized in that all the variation ribs in the field between the bottom of the key channel and the guide ribs in the middle field have the characteristics of claim 5. Cylindrical locks according to one of Claims 4 to 7, characterized in that the locking pins (42) consist of a first and second circular cylinder (45, 46) having a substantially different diameter at the base thereof. the smaller diameter circular cylinder (45) being the tactile end (48) and the larger diameter circular cylinder (46) behind the block end. Cylindrical locks according to one of claims 4 to 8, characterized in that the tactile end (48) of the locking pin (42) moves out into the undercut profiled groove (50) of the profiled key channel and can be pulled back out of this profiled the groove is pushed by a flat key with an undercut rib (49). Cylindrical locks according to one of Claims 4 to 9, characterized in that the locking pin (42) has a smaller diameter in the area of the tactile end (48) to increase the reliability of the sensing. A method of manufacturing a flat key according to claims 1 to 3, characterized in that in the flat sides (2) of the key (7) the key is at the junction of predetermined grooves (3,3 ', 4, 4', 10, 11) and flat the sides (2, 2 ') are removed in the axial direction by small grooves (6, 6') whose width measures between 0.1 mm and 0.3 mm and a depth between 0.05 mm and 0.2 mm, preferably about 0, 1 mm, then the guide grooves are made in the flat sides and the milling head of the milling machine is moved back and forth to produce axial variations of the grooves in the flat sides of the key blank. A method of manufacturing a flat wrench according to claim 11, characterized in that the small grooves (6, 6 ') have a semicircular outline in cross-section. A method of manufacturing a flat key according to claim 11, characterized in that the small grooves (6, 6 ') have a trapezoidal outline in cross-section. A method of manufacturing a flat key according to claim 11, characterized in that the small grooves (6, 6 ') have a rectangular outline in cross-section. A method of manufacturing a flat key according to one of claims 11 to 14, characterized in that the junctions of the flat sides (2, 2 ') with the flanks (14) of the flanks or the junctions of the flanks (14) of the slots with the bottom (15) of the slots are rounded. A method of manufacturing a flat wrench according to claim 15, characterized in that the length of the radius is measured at half the side (14) of the groove. A method of manufacturing a flat key according to one of claims 11 to 16, characterized in that after cutting two adjacent, partially overlapping variation grooves in the flat side, the rib formed during the variation grooves is cut off or broken. 18. A method of manufacturing a flat wrench according to claim 17, characterized in that the cutting or breaking of the remaining rib is carried out with a retractable milling head, such as was used at least to produce a second groove.