GB2214226A - Magnetic locks - Google Patents

Description

1 Improvements in or relating magnetic lock insert for lock mechanisms 22

14 2 r12 6 The invention relates to an improved magnetic lock insert for lock mechanisms provided with at least one lock cylinder arranged in a standardized lock body in a sealed rotatable manner, said lock cylinder is connected to the bolt carrier of the lock mechanism containing the magnetic lock insert wherein the lock cylinder contains a centralized key channel receiving a key containing permanent magnetic discs, i.e. key magnets magnetized chordally or diametrically with a given angular pitch with NorthSouth polarization and said key channel is enclosed on both sides by a nest each; in the rotor supports completing the lock cylinder to the cylindrical shape rotors are embedded rotatably, the number and axis of rotation of which correspond to the key magnets of the key inserted into the key channel and in every rotor there is a rotor magnet fixed, being identically magnetized with the key magnet and on the side of the rotor lying opposite to the rotor magnet one or more indents are formed which are forming a continuous latch channel at the rotors having been turned into the opening position upon the effect of the key inserted; in the rotor supports an opening covering the latch channel further in the inner wall of the lock body a latch groove covering said opening are formed, in which - in the basic position of the lock insert of the cylinder lock - a latching element is arranged in a guided and movable way, futheron, a spring-loaded spherical apliance is provided for determining the relative position of the lock insert of the cylinder lock to the lock body, fixing the inserted key - not being in its basic position in the key channel and hindering boring of the lock insert of the cylinder lock.

The proposed improved magnetic lock insert for the cylinder lock can be advantageously used for furnishings requiring 2 - increased protection, first of all to lock mechanisms of doors and gates, either as a component of a new lock construction or as a replacement of older magnetic inserts of cylinder locks.

Due to the increased number of variations and higher safety the magnetic inserts of cylinder locks supressed the use of the traditional cylinder lock inserts and have been used in an ever widening circle. In the GB-PS 2142969 a magnetic lock insert for lock mechanisms as described in our preamble is disclosed, details of which - being important also from the aspect of the lock insert according to the invention - will be presented by the aid of Figures 1-7.

In a lock body 1 with standardized dimensions a lock cylinder 2 is to be found which can be rotated from its static condition according to Figure 2 by means of its own key 3 into the opening position, as illustrated in Figure 4.

Now, if we turn further the lock cylinder 2, the bolt carrier connected therewith displaces the latch of the lock mechanism, thus the lock mechanism can be opened. From its basic position the lock cylinder 2 can be turned exclusively with its own key 3. In the body of the key 3, in the nests, the number of which amounts generally to three and have a circular cross-section, three permanent magnet discs are built-in on both sides of the key 3. On said magnet discs different magnetic codes are formed.

The code is such that in the round magnet disc i.e. in the keymagnets 12 a magnetic field with North-South dipole is formed which is halved with a neutral line, as it is to be seen in Figure 6. Within the angular range of 360 0 the neutral line is wandering - starting from 0 0 - in an angular pitch being characteristic for a given system, consequently 3 - r, in respect to 0 0 dipole magnetic fields with NDrth-South pole, displaced by different angular pitches can be formed in accordance with the number of the planned variations. With the angular pitch of 60 0 assuring the highest resolution according to present prior arts dipole magnetic fields of six types can be generated. Built-in in one single key the six kinds of magnetic field enable a variation of

6 6 46 656.

On both sides of the key 3 lying within the lock cylinder 2, in the rotor supports 2 three rotors 6 on the each side are arranged containing round magnetic discs - furtheron rotor magnets 5 - while said rotor magnets 5 are made of same material, as the magnetic discs in the key 3, i.e. as the keymagnets 12 and they are identically magnetized therewith. Rotors 6 are embedded so, as to be able to rotate by the aid of their shafts 7 and they are turning upon the effect'of a smaller moment too. On the back side of the rotors 6 chordally an indent is formed having the cross- section of a truncated cone and serves for receiving the latching element of the lock cylinder 2. After having placed the proper key 3 into the key channel 10 of the lock cylinder 2 the dipole magnet fields on the keymagnets 12 affect the dipole magnet fields of the rotor magnets 5 fixed in the rotors 6 through the wall of the key channel 10 and as a consequence of torque resulting from the arising interactions turns the rotors 6 into opening position in compliance with the codes of the key 3. Now the indents on the back side of the rotors 6 form an aligned continuous latch channel 11. Under the effect of the twisting moment forwarded by the key 3 to the lock cylinder 2 the lock cylinder 2 tries to turn and the latching element formed as a latch 8 in this case - is bearing up against the wall of the latch groove 9 of the lock body 1 in its basic position upon the effect of the springs 13, as it becomes obvious from Figure 3 and rolling along the arched wall of the latch groove 9 and guided and displaced in the opening 18 of the rotors 6 it sinks with its other end into the latch channel 11, as a consequence, the lock cylinder 2 can be rotated around in the lock body 1 in compliance with its position in Figure 4. In case, if in course of opening an alien body or an inproperly coded key is used the latch channels 11 of the rotors 11 remain in an unoriented position upon the interaction between the dipole magnet fields of the rotor magnets 5 or upon the effect of the alien key - magnets 12 they get into an inproperly coded position and thus they do not receive the latches 8 which are bearing up against the backside of the rotors 6 and the wall of the latch groove 9, accordingly, a part of the latch

8 remains in the latch groove 9 in its blocking position and the lock cylinder 2 cannot be rotated in the lock body 1, not even with a high torque. The partial section in Figure 3 illustrates the state, in which the own key 3 is inserted into the key channel lo, so as a consequence of proper coding of the keymagnets 12 the rotor magnets 5 are turning into the proper direction and form a continuous latch channel 11. However, the latch 8 is still bearing up against the wall of the latch groove 9 upon the force of the springs 13, so this corresponds to the basic position according to Figure 2.

As we are speaking of a construction containing several movable components in a small space, the proper and reliable function of which considerably influences the applicability of the construction, the insert of the cylinder lock presented here contains the sealing rings 14, 15 for preventing external contaminations, furtheron, against boring for reaching the latch 8 a spring-loaded spherical applicance with a steel catch is built-in into the bore 16, which is able to prevent pulling out of the key 3 outside the basic position and fixes the opening resp. closing position of 1 11 the lock mechanism.

To prevent axial pulling out, being usual at boring, recesses 17 are formed on the latches 8. In case, if on the rear-side of the rotors 6 two latch channels.11 are formed instead of one, this possibility is illustrated with a discontinuous line in Figure 6, the rotor 6 will occupy a position upon inserting two differently coded keys 3, in which one of the latch channels 11 will be able to receive the latch 8, as a consequence, lock systems with main and master keys can be obtained.

Magnetic lock inserts play an important role in the field of burglarproofness. These types of lock mechanisms cannot be opened by means of special burglar's tools, by applying building appliances of proper thickness the locks are resistant even to coarse burglarious methods. However, after a certain period of Use the magnetic insert of the cylinder lock becomes contaminated, gets seized and opening becomes more and more difficult. This circumstance reduces confidence in inserts of cylinder locks. Although soaking and cleaning with some solvent in regular intervals May promote the solution of this problem, however, not everybody is able to undertake regular disassembly and washing of the insert of the cylinder lock. Contaminations may occur from several sides: external contamination results from the circumstance that minute particles getting into the lock construction from the environment and'which are partly collected by the magnets deposit in course of times and prevent accurate setting-in of the rotors 6 and thus faultless function of the construction. Sealing rings 14, 15 made usually of rubber, some synthetic or silicon material eliminate considerably external contaminations, simultaneously axial-centric setting-in of the lock cylinder 2 reduces frictional abrasion of the lock cylinder 6 2 and the wall of the lock body Internal contamination occurs after frequent use and so, in so far as material particles peeling-off from frictioning surfaces as a consequence of gliding friction arising in course of operation are also depositing in co urse of times and prevent accurate setting-in and faultless function of the rotors 6. In addition to contamination a further problem is connected to the consumption of lubricant, as a consequence, friction coefficient increases considerably, frictional surfaces become more rough, they get seized and jamming of the lock insert of the cylinder lock occurs.

Gliding friction is considerable at the rounded rear-end of the latch 8 and on the sides being in contact with the openings 18 of the rotor support 4, additionally in the latch channels 11 of the rotors 6.

Reduction of sliding friction and lubrication of the lock mechanism can be solved exclusively by using petroleum, as confirmed by the experiences gained in practice, which is well suitable for washing and lubricating the construction by virtue of its composition. In general, when using other lubricants due to thickening the rotors 6 are braked and cannot be set into the proper opening positions. With traditional inserts of cylinder locks graphite used to be applied for reducing gliding friction. Due to the high gliding friction with magnetic lock inserts of cylinder locks application of powdered graphite is not at all ef- ficient, as pulverized graphite gets together with other material particles having been peeled-off in course of friction to the rotors 6 and brakes them, accordingly proper setting-in of the rotors 6 into the opening position can be hindered.

In course of production of the lock mechanisms it is of utmost importance that intensity of the key magnets 12 and rotor magnets 5, accuracy of magnetizing and torques produced by the magnetic fields could exert their effect on the elements partaking in closing in an unhindered way.

In course of practical application it could be stated that the torque produced by the interaction between key magnets 12 and rotor magnets 5 decreases proportionally with the square of mutual distance, in case if the space is filled with a zinc alloy and it decreases in a cubic proportion, if the space is filled with air. Accordingly, in order to be able to achieve the possibly highest torque, distance between key magnets and rotor magnets is to be reduced to the minimum. The characteristic embodiment of the lock inserts of cylinder locks of the prior art - as shown in Figure 7 - has two key magnets 12 fixed in the key 3, so in the key 3 of the lock insert of the cylinder lock according to Figure 1 six key magnets 12 are arranged. In such a manner it becomes possible that six key magnets 12 of the key 3 could turn simultaneously six rotor magnets 5 into the coded opening position. As already emphasized earlier, in practice within one circle with an angular pitch of 600 six kinds of dipole magnet fields are generated, accordingly 6 6 = 46 656 variations can be obtained.

With the majority of the presently usual magnetizing processes accuracy of magnetizing does not enable considerable increase of the angular pitch of 600, as accuracy of settingin of the rotors 6 will not be satisfactory. With cylinder locks based on the pivot system and used in a wide circle, 35 000 variations are considered as sufficient for the practical use. This number of variations is achieved so, in so far as by varying the six pivots in five different sizes 6 the variation of 5 15 625 can be realized, further increase is obtained by changing the shape of the key.

- 8 i In order to assure proper number of variations with the magnetic lock insert of cylinder locks two key magnets 12 each are to be pressed into every single nest of the key 3. This solution involves the advantage, in so far as the high number of variations can be achieved with relatively few, more accurately with six kinds of rotors, however, simplicity is accompanied by the following drawbacks:

Key magnets 12 must be extremely thin to avoid increased thickness of the key 3, as simultaneously with increasing thickness, wall- thickness of the material between key magnets 12 and rotor magnets 5 is to be increased too. In a wide key channel 10 a rather high twisting torque can be exerted by using an alien body, while small wall tick- nesses are unable to resist to the large pressure forwarded to the backside of the rotors 6 by the latch 8, the lock cylinder 2 is turning over. To avoid interactions between the thin key magnets 12, they cannot be fully magnetized, only lines of magnetic force returning in an approximately U-shape have to be generated in the inside of the key magnets 12. In such a manner full magnetic saturation cannot be achieved, accordingly, weaker key magnets 12 will stay at disposal, as if we applied linear parallel magnetizing, as it is usual with rotor magnets 5.

Due to the relatively thick key 3 the wall between the key magnets 12 and the rotor magnets 5 will be relatively thick too, as a consequence interacting torques will be reduced considerably.

By pulling out the key 3 only the interaction between key magnets 12 and rotor magnets 5, after having performed pulling out, interaction between the rotor magnets 5 enable that the rotors 6 should get into a disordered position differing from the coded position permitting opening. Due ik to the considerable wall thickness these effects are weakening, as a consequence, e.g. due to the contamination of the rotating rotors 6 disordered position will not be formed even after having pulled out the key 3, thus endangering safety of closing.

With the known magnetic lock inserts of cylinder locks two independently functioning magnetic circles are formed, indicated with the discontinuous lines 20 of magnetic force in Figure 7. However, in practice there is an interaction between the lines of magnetic force and distorting this mutual interaction the accurate setting-in of the rotors 6 is rendered difficult.

The aim of our invention is to eliminate the deficiencies of known inserts of cylinder locks and to develop a magnetic insert for cylinder locks with a long useful life, with reliable function and not requiring maintenance, which can be produced economically with simple means, with a high variation number.

Our invention is based on the recognition that access of contaminations representing the main cause of uncertain operation has to be prevented, so that the magnetic insert of the cylinder lock could function with a high reliability, with the lubricant having been applied in course of produc tion, not requiring further maintanance; a futher aim lies in to achieve a better angular pitch by magnetizing the key magnets in their full thickness in comparison to the presently applied angular pitch of 60 0, in such a manner with less key magnets, however, with a higher code number identical number of variation, the more, number of variations exceeding the present one can be achiebed.

In course of solving the task set we started from a magnet- 1 - 10 ic lock insert of a cylinder lock mechanism which is provided with at least one lock cylinder arranged in a standardized lock body in a sealed and rotatable manner, said lock cylinder is connected to the bolt carrier of the lock mechanism containing the magnetic lock insert of the lock, wherein the lock cylinder contains a centralized key channel receiving the key containing permanent magnetic discs, i.e. key magnets magnetized chordally or dimametrically with a given angular pitch with North-South polarity and said key channel is enclosed on both sides by a nest each; in the rotor supports completing the lock cylinder to a cylindrical shape rotors are embedded rotatably, the number and axis of rotation of which correspond to the key magnets of the key inserted into the key channel and in every rotor there is a rotor magnet fixed, being identically magnetized with the key magnet and on the side of the rotors lying opposite to the rotor magnet one or more indents are formed which are forming a continuous latch channel at the rotor magnets having been turned into the opening position upon the effect Of the key inserted; in the rotor support an opening covering the latch channel and in the inner wall of the lock body a latch groove covering said opening are formed, in which - in the basic position of the lock insert - a latching element is arranged in a guided and movable way, furtheron, a spring-loaded spherical steel appliance is provided for for determining the relative position of the lock insert to the lock body fixing the inserted key which is not in its basic position, in the key -channel and hindering the boring of the lock insert of the lock mechanism.

In accordance with the invention this lock insert is developed so, that to prevent the contaminations occuring in course of use of the insert of the cylinder lock, introduced from outwards and resulting of internal friction and to assure 11 - the accurate turning of the rotors into the opening position the latching element contacts the wall of the latch groove only in one single point and at least in one cross-section of the opening it is fitted in a form- closing way to the opening.

In order to increase the number of variations at the magnetic lock insert of the cylinder lock and to increase the interaction between the key magnets and the rotor magnets the thickness of the key magnets corresponds to the tickness of the key, while the key magnets - having been magnetized in their full thickness according to an angular pitch of 20 0 at most are enclosed by a rotor magnet each, magnetized similarly to the key magnets.

The embodiment of the magnetic lock insert of the cylinder lock is considered as advantageous, with which the latching element is composed of a latch extending in the opening of the rotor support and fitting into the latch channels of the rotors and of an intermediate element interconnecting the rearside of the latch and the wall of the latch groove. The intermediate element can be fitted easily to the shape of the opening of the rotor support, accordingly, neither into the inside of the rotor support nor into the range of the latch channel contaminations will be introduced.

In the aforementioned case it is considered as advantageous, if the intermediate element is a metall ball fitting to the diameter of the opening with a circular cross-section in a form-closing but displaceable way, in simpler case it may be a barrel- shaped roller or a cylindrical roller meeting general requirements.

i The embodiment is also considered as advantageous, with which key magnets and rotor magnets are magnetized with an angular pitch of 11 0, as in this case in addition to proper 12 - mechanic strength a high number of variation can be achieved.

With the improved lock insert of the cylinder lock according to the invention by changing the latching element wear due to gliding friction and jamming resulting from the lack of lubrication could be eliminated. Practically no peeling off of material particles from the friction surfaces being usual at gliding friction occur, as a consequence functional-failures due to inproper setting - in of the rotors and zinapplicability cease. By virtue of the closed design failures due to external contaminations can be fully eliminated.

As a consequence of decreased friction requirement of lubrication will be less, in such a manner with closed embodiments of the inserts of cylinder locks it suffices to apply lubricant only once, in course of production, while with the open embodiments required maintenance and lubrication are considerably decreased.

By virtue of the stronger magnetic field a more robust and safer insert of cylinder lock can be manufactured without reducing the number of variations below the internationally accepted level.

The invention will be described in detail by means. of some preferred embodiments, with reference to the accompanying drawings, wherein:

Figure 1 Figure 2 is the longitudinal section of a detail of the magnetic insert of the cylinder lock belonging to prior art, is the cross-section bf-the insert of the cylinder lock along the line II- II of Figure 1, in basic position, with the key inserted, k Figure 3 Figure 4 the section taken along the line III-III of Figure 1, Figure 5 Figure 6 Figure 7 the cross-section of the lock insert taken along the line IV-IV of Figure 1, with the lock insert turned into the opening position, the enlarged sectional view of a rotor of the lock insert of the cylinder lock according to Figure 1, is the front view of the rotor according to Figure 5, is the central enlarged detail of the lock insert of the cylinder lock according to Figure 2, with the magnetic circles, Figure 8 is the longitudinal sectional view of a possible embodiment of the magnetic lock insert of the cylinder lock according to the invention, 25 Figure 9 is the cross-section of the insert according to Figure 8, taken along the line IX-IX with the lock cylinder in the basic position, 30 Figure 10 is the sectional view of the lock insert of the cylinder lock taken along the line X-X of Figure 8, Figure 11 is the cross-section of the lock insert 35 taken along the line XI-XI of Figure 8, with the lock cylinder turned into the opening position.

14 - some possible embodiments of the latch are illustrated, Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 is a section taken along the line XIII-XIII of Figure 12, is a section taken along the line XIV-XIV of Figure 12, is a section taken along the line XV-XV of Figure 12, Figure 17 Figure 16 Figure 19 Figure 20 illustrates the coded magnetization of the rotor magnets and key magnets of the lock insert of the cylinder lock according to the invention, shows the area of the latch and the rotor accupying the worst case closing position in respect to mechanics, is the side view of the rotor and the latch according to Figure 17, is the cross-section taken along the line XIX-XIX of Figure 8 with the lock cylinder in its basic position, and shows the enlarged central detail of the lock insert of the cylinder lock insert of the cylinder lock according to Figure 19 with the lines of magnetic force.

Design and function of the magnetic insert of the cylinder k f k 1 1 lock, as well as deficiencies resulting therefrom representing prior arts - were already described in our preamble, so we do not deal therewith here.

Figure 8 illustrates the longitudinal sectional view of a detail of the developed magnetic lock insert of the cylinder lock according to the invention. From the comparison of Figure 8 with Figure 1 different formation of the latching element becomes obvious. From the cross-section in Figure 9 it can be well see that instead of the one single latch 8 a latching element is used, which consists of the latch 8 sinking into the latch channels 11 after having turned the lock cylinder 2, as well as of the intermediate element Ba interconnecting the latch 8 and the latch groove 9 of the lock body 1.

As it is to be seen in Figures 9 to 11, this intermediate element is a steel ball which is fitting diametrically and form-closing to the opening 18 of the rotor support 4 so, that it is able to move therein, at the same time it isolates the inside of the rotor carrier 4 from the outer world.

From Figure 10, from the partial sectional view therein it can be well seen, that basic position of the latch 8 similarly to the earlier described solutions - is assured by the springs 13, at the same time the latch B was narrowed to such an extent that the intermediate element Ba could be fitted between the latch 8 and the wall of the latch groove 9 without being jammed.

Unambiguous arrangement of the latch 8 and the intermediate element Ba is enabled by the nests on the rearside of the latch 8 fitting to the shape of the intermediate element Ba.

In Figure 11 it can be well seen that in course of turning i the lock cylinder 2 the intermediate elements Ba - in our case steel balls - are rolling down on the wall of the latch groove 9 and sink unhindered into the opening 18 of the rotor support 4, as a consequence - in case of turning with the proper key 3 - the latch 8 gets sunk into the latch channel 11.

In Figure 12 we present three examples for the different formations of the intermediate element 8a: into the nest 19 of the latch 8 on the left side a steel ball is fitting, a barrel- shaped roller is fitting into the central nest 19, while a cylinder roller meeting general requirements is fitting into the nest 19 on the right side. In Figure 13 the cross-section of the latch 8 contacting the inter- mediate element Ba - the ball - is to be seen, while in Figure 14 we illustrated the cross-section of the latch 8 being in contact with the barrel-shaped intermediate element 8a. In Figure 15 embodiment of the proposed insert of the cylinder lock - more precisely, two components thereof - are to be seen, wherein the latch 8 does not contact two, three or four intermediate elements 8a, in which case the number of the openings 18 in the rotor support 4 corresponds to the number of the intermediate elements B@, but the intermediate element Ba is formed by one single needle roller with the same length as that of the latch 8, which is fitting into the opening 18 of the rotor support 4, the size of which corresponds to the size of the needle roller. On the needle roller, which - when sunk into the nest 19 of the latch 8 - is unable to move in the longitudinal direction in respect to the latch 8, in a way known in itself, two recesses 17 are to be found, the task of which lies in to prevent forceful pulling out of the intermediate element Ba and the latch B therewith.

Figures 16a-16c illustrate coded magnetizing of the rotor magnets 5 and the key magnets 12. In Figure 16a it can be t 1 P 1 f seen that after having been magnetized every single rotor magnet 5 and every key magnet 12 contains dipole magnetic fields with North-South polarization, wherein position and direction of the separating limitline of the North- and South pole, respectively, indicates the angular pitch of magnetizing.

In Figure 16a arbitrarily we took the vertical limit-line as 00, angular pitch of 600 having been applied at the magnets of the cylinder lock inserts belonging to prior arts was indicated with a discontinuous line. In contrast to it, by applying a far smaller angular pitch - e.g. 11 0 at the rotor magnets 5 and key magnets 12 according to the invention ( see Figs. 16b, 16c) number of possible codes could be triplicated.

Application of an angular pitch being less, than 11 0 apart from the utmost high precise requirements to be met by magnetizing means - is not considered as expedient, as due to the use of an alien object or alien key the common area of bearing of the rearside of the rotors 6 not turninginto the opening position just because of the use of alien objects, as well as of the latch 8 pressed thereto, will be reduced to such an extent that deformation of the latch 8 or of the rotor 6 may occur, leading at last to the deficiency that deformed components enable springing of the latch 8 into the slightly turned latch channel 11 under force. With the most disadvantageous case, as it is to be seen in Figure 17, representing the worst case, compressive strength of surfaces of the rotor 6 and the latch 8 contacting each other is able to take up without any deformation the load produced by the twisting torque of the alien body or alien key inserted into the key channel 10.

With the embodiment illustrated in Figure 19 the crosssection of the lock insert of the cylinder lock according i 18 to Figure 8 was changed so, in so far as three key magnets 12 are built- in into the key 3 instead of the three times two key magnets 12, however, these were not provided with the returning magnetizing as before, but they are magnetized in their full thickness, in the same way, as the rotor magnets 5. Upon this effect one single continuous magnetic circle will be formed, as it is to be seen in Figure 20, which is closed on the keymagnet 12 and the rotor magnets 5 enclosing it on both sides. As it is to be seen, thickness of the key 3 and simultaneously the width of the key channel 10 receiving the key is far smaller than in case of the traditional lock insert of the cylinder lock according to Figure 6, in such a manner with a stronger mechanic construction smaller wall- thickness can be realized on both sides of the key channel 10. In such a manner it can be partly hindered that a coarse and strong alien body could be pushed or knocked in into the key channel 10, partly - for reasons earlier described the formation of a far larger magnetic force field can be achieved improving definiteness of closing and opening, simultaneously increasing safety.

If in course of magnetizing we apply an angular pitch of 11 0 at the rotor magnets 5 and key magnets 12, with the rotor magnets 5 having been coded in thirtythree different ways in three key nests 33 3 = 35 937 variations can be obtained. By changing the shape of the key channel 10 resp. of the key on basis of all, what has been said, more than 150 000 different variations can be obtained, meeting all the requirements.

In the appended claims reference numbers have been added solely by way of facilitating comprehension but it is hereby declared that the scope of the claims is not intended to be limited in any way whatsoever by the use of the reference numbers.

19 -

Claims (10)

1. Improved magnetic lock insert for cylindric lock mechanisms provided with at least one lock cylinder arranged in a standardized lock body in a sealed-and rotatable manner, said lock cylinder is connected to the bolt carrier of the lock mechanism containing the magnetic lock insert of the lock, wherein the lock cylinder contains a centralized key channel receiving the key containing permanent magnetic discs, i.e. key magnets magnetized chordally or diametrically with a given angular pitch with North-South polarity and said key channel is enclosed on both sides by a nest each; in the rotor supports completing the lock cylinder to a cylindrical shape rotors are embedded rotatably, the number and axis of rotation of which correspond to the key magnets of the key inserted into the key channel and in every rotor there is a rotor magnet fixed, being identically magnetized with the key magnet and on the side of the rotors lying opposite to the rotor magnet one or more indents are formed which are forming a continuous latch channel at the rotor magnets having been turned into the opening position upon the effect of the key inserted; in the rotor support an opening covering the latch channel and in the inner wall of the lock body a latch groove covering said opening are formed, in which - in the basic position of the lock insert - a latching element is arranged in a guided and movable way, furtheron, a spring-loaded spherical steel appliance is provided for for determining the relative position of the lock insert to the lock body fixing the inserted key which is not in its basic position, in the key channel and hindering the boring of the lock insert of the lock mechanism c h a r a c t e r i z e d in that in order to prevent access of external contaminations, and impurities resulting from internal friction in t the use of the lock insert of the cylinder lock and to assure accurate turn of the rotor houses into the opening position,the latch element contacts the wall of the latch groove (9) in a pointlike manner along its cross-section and at least in one cross-section of the opening (18) it is fitted -locy to the opening (18).

2. Lock insert of cylinder lock as claimed in Claim 1, c h a r a c t e r i z e d in that the latch element is composed of a latch (8) extending in the opening (18) of the rotor support (4) and fitting into the latch channels (11) of the rotors (6) and of the intermediate element (B@) interconnecting the rearside of the latch (8) and the wall of the latch groove (9).

3. Lock insert of cylinder lock as claimed in Claim 2, c h a r a c t e r i z e d in that the intermediate element (8a) is a steel ball fitting to the diameter of the opening (18) with a circular cross-section in a form-closing, however freely displaceable manner.

4. Lock insert of cylinder lock as claimed in Claim 2, c h a r a c t e r i z e d in that the intermediate element (8a) is a barrel-shaped roller fitting to the diameter of the opening (18) in a form-closing but freely displaceable way.

5. Lock insert of cylinder lock as claimed in Claim 2, c h a r a c t e r i z e d in that the intermediate element (8a) is a cylindrical roller fitting to the diameter of the opening (18) in a form-closing but freely displaceable way -

6. Lock insert of a cylinder lock as claimed in Claim 2, 35 c h a r a c t e r i z ed in that the intermediate element (8a) is a needle roller fitting in a form-closing but freely displaceable way to the diameter of the opening (18) and the length of which approximates the length of the latch (B).

Lock insert of a cylinder lock as claimed in any of the Claims 1 to 6, c h a r a c t e r i z e d in that the intermediate element (8a) extends into one or more nests (19) formed in the rearside of the latch (8) and either on the intermediate element (8a) or the latch (8) a transversal recess (17) is formed for preventing forceful pulling out of the intermediate element (Ba) or the latch (8).

Improved magnetic lock insert for cylindric lock mechanism provided with at least one lock cylinder arranged in a standardized lock body in a sealed and rotatable manner, said lock cylinder is connected to the bolt carrier of the lock mechanism containing the magnetic lock insert of the lock, wherein the lock cylinder contains a centralized key channel receiving the key containing permanent magnetic discs, i.e. key magnets magnetized chordally or diametrically with a given angular pitch with North-South polarity and said key channel is enclosed on both sides by a nest each; in the rotor supports completing the lock cylinder to a cylindrical shape rotors are embedded rotatably, the number and axis of rotation of which correspond to the key magnets of the key inserted into the key channel and in every rotor there is a rotor magnet fixed, being identically magnetized with the key magnet and on the side of the rotors lying opposite to the rotor magnet one or more indents are formed which are forming a continuous latch channel at the rotor magnets having been turned into the opening position upon the effect of the key inserted; in the rotor support an opening covering the latch channel and in the inner wall of the 22 - lock body a latch groove covering said opening are formed, in which - in the basic position of the lock insert - a latching element is arranged in a guided and movable way, furtheron, a spring-loaded spherical steel appliance is provided for for determining the relative position of the lock insert to the lock body fixing the inserted key which is not in its basic position, in the key channel and hindering the boring of the lock insert of the lock mechanism c h a r a c t e r i z e d in that to increase the variation number of the insert of the cylinder lock and to increase the magnetic interaction between rotor magnets (5) and key magnets (12) the thickness of the key magnets (12) corresponds to the thickness of the key (3) and the key magnets (12) magnetized at an angular pitch of at most 20 0 in full thickness are enclosed on both sides by identical ly magnetized rotor magnets (5).

9. Lock insert of a cylinder lock as claimed in Claim 8 c h a r a c t e r i z e d in that the key magnets (12) and rotor magnets (5) are magnetized with an angular pitch of 0 11.

10. Magnetic lock insert according to claim 1 or claim 8 substantially as herein described with reference to and as shown in Figures 8 to 11, 19 and 20; or Figures 12 to 15; or Figures 17 and 18 of the accompany drawings.

Publi8hed 1989 atThe PatentOMee, State House.6671 Hip Holbom, LondonWClR4TP. Further copies maybe obtainedfromThe Patentc)BIce.

Snaw Zran-.s, St llaj7 C--sr. Trinted by Multiplex techniques Itd, St Mary Cray, Irent, Con. 1187 C_ R