Cylinder lock and reversible flat key

Beginning of the patent period; iggo 12 15 Longest possible duration:

© Issued on: 1981 07 27 © inventor:

© dependence:

© Pamphlets considered to delineate the prior art:

AT 363 337

- 2 No. 363337

The invention relates to a key-lock combination on cylinder lock base with lock side in the projecting into the keyway cams of tumblers and longitudinal

Profile grooves in the flat key, in particular reversible key, wherein the profile grooves each follow curved planar curves on the key subject sides and the cams for the displacement of

Tumblers between locking division and release position engage in the profile grooves and have the same cross-section as the profile grooves, with the inserted key matching the position of the cam in the profile grooves relative to the lock axis the code of the tumblers corresponds (US-PS No. 3,264,852). Although the number of possible combinations in the design of such security locks and their keys is very high, but the combination option is once exhausted, u.zw. especially in the various design of master keys that ever fit to a larger number of different types of locks.

It is the object of the invention to provide, for security locks and keys of the type mentioned above, groups of associated keys and locks which are mutually exclusive, ie that keys of one particular group can not be used to open locks of another group. Thus exhausted combination possibilities can be fully exhausted for one group with another group. This object is achieved according to the invention in that for the construction of locking systems with groups of associated keys and locks the profile grooves of the key and the cam tumblers of the locks within a group in pairs with the same, from group to group but with ver20 different dimensions, in particular width and Depth are executed.

Locking cam of the lock and therefore can be inserted, impossible.

Although it is known to graduate keys of a closure system in their profile so that

Key with too great a profile can not be inserted into a lock with too small a key channel (DE-PS No.1087932). On the other hand, keys with a smaller profile can be inserted, and if the combination is right, they can also be used to operate the lock. It is therefore not a complete mutual exclusion of groups of keys before and also directed only to the blocking of insertion measures have nothing in common with the inventive measures. Characterized in that according to the invention, the dimensions of the tumbler actuated cam of the locks or the grooves of the keys are varied and not in the known manner the dimensions of the profile of the lock channel and the key, ab35 solute mutual exclusion is achieved under locks and keys of different groups .

The lock-key combination according to the invention has the particular advantage that the dimensions can be varied in various combinations. Not only can the grooves be made different widths and / or different depths, but one has the choice, at each

Key side to run one or the other groove deeper or wider. If the grooves are made at different depths, the depth of the deeper grooves may preferably reach at least half the key thickness, such that several different groove depths are possible for mutual exclusion of groups of keys and locks.

The invention will now be explained in more detail with reference to an embodiment and a variant embodiment, which are illustrated in the drawings. Fig.l shows a side view of the key with different widths of grooves, Figure 2 shows a detail of Fig.l on a larger scale, Figure 3 shows a section along line III-III in Figure 2 and Figure 4 shows one of FIG .3 corresponding section of the embodiment.

The key according to Fig.l, which corresponds in its outer shape and in its overall dimensions a known key, has on both flat sides of the key profile -1- each have a narrow groove -2- and a width groove -3-, which is shown in particular in FIG .3 is visible. Grooves of the same width and the same shape are center-symmetrical with respect to the longitudinal axis of the key profile -1-. In Figure 3, the cams are -4 and 5 of the tumblers 4 'and 5' -

- 3 No. 363337 indicated in dash-dotted lines. These cams also have different diameters, ie, the smaller grooves -2- associated cam -4- have smaller diameter than the wide grooves -3- associated cam -5-. It is impossible in this case, a key with equal width grooves, ie with grooves that are narrower than the cam -5- introduce into the lock. However, if it should be possible to insert a key with equally large lugs whose width is sufficient to accommodate the cams in a lock, the cams -4- would have play in the key grooves, so that the tumblers in question are not in the prescribed positions would be brought to turn the lock cylinder. It is therefore guaranteed under all circumstances,

The position of the grooves on the key can also be reversed, ie the wider grooves -3- can occur at the points of the narrower grooves -2- and vice versa. In this way, two additional types of keys and locks are possible, ie the number of key and lock combinations available can be quadrupled compared to the system with equal width slots and tumbler.

As shown in Figures 2 and 3, the key profile is also on the narrow sides with frusto-conical holes -6- of different depth, whereby the number of possible combinations is additionally increased, which can be further increased by the variation of the dislocations.

The number of different lock and key types can be further increased by changing not only the width but also the depth of the grooves. In Figure 4, the cross section of a key profile is shown, which is provided with different deep grooves, namely with two centrally symmetrically opposite, deeper grooves -7- and two centrally symmetrical opposite, shallower grooves -8-. In Figure 4 is also indicated that the deep grooves -7- associated cam -9- are longer than the grooves -8- associated cam -10-. Also in this case it is not possible to insert a conventional key with two equal depth grooves, because the longer cams lock the insertion of the key. Preferably, the depth of the deeper grooves -7- reaches at least half, better a little more,

It is also possible to provide further lock and key variants in such a way that the grooves and cams are varied in width and depth.

Finally, it is also possible in pairs to vary the width and / or depth within a groove, wherein, of course, the groove at the inlet must be wider and / or deeper than the rear.

The described measures for increasing possible combinations of keys and associated security locks not only has the advantage of increasing the number of possible combinations to a multiple, but it is thus clearly ruled out that inaccurate key imitations can be introduced into the lock at all. Thus, the risk is greatly reduced that locks are damaged by the use of inaccurate key copies or that inaccurate key copies can indeed be introduced, but do not allow the operation of the castle.

In addition, when using grooves whose depth is at least half the key thickness, the imitation considerably more difficult, if not impossible.