Invention relates to a coded lock intended for use in safes, strong-rooms, safe- deposit boxes and armored cabinets. A number of solutions of coded locks intended for use in safes, strong-rooms, safe-deposit boxes and armored cabinets are known.

A patent specification No. US 5473919 presents a coded lock which

comprises a housing, a rotary rod, a controller connected to a rotary rod cam, a pin sliding to and from the housing, a lever and housing, and also a set of rotary disks, A pivot joint connects one end of the housing lever to the pin, while the other end of the housing lever is provided with a grip which can be seized with the cam controller through a slit in the outer circumference. The cam controller is fastened to the drive shaft. It has two permanent magnets distributed circumferentially around the seat, on one side each. Permanent magnets are also mounted on a part of the housing lever grip. Permanent magnets are seated in the controller cam in such a way that the opposite magnetic poles generate repulsing forces when the lever guide moves close to the cam controller on both sides of the groove. That function prevents blocking the coding unit and detecting the accurate location of the controller seat, and therefore makes impossible detection of the slit location in aligned drum disks.

Another american patent specification US 4163376 presents a coded lock with disk wheels, which has disk wheels rotatably immobilized on a fixed rod in the locked position and such components as drive cams to turn a disk wheel to a preset angular position for lock opening. The lock cassette has inclined surfaces adjacent at one end to the disk stack and containing a regulating unit with a tightened spring.

Movable units are regulated in reaction to insertion and movements of a tool in the locking mechanism chamber. Still another american patent specification No. US 5816084 presents a coded lock with an electronic code, where the user rotates an external disk for excitation of generators which transfer energy from a capacitor bank. Next, the user rotates an interna! handwheel of a microcontroller to cause displaying sets of digits one by one. He presses the internal handwheel to select a number displayed. The microcontrolier determines the direction and range of motion of an internal disk by receiving signals from Wiegand sensors placed close to a magnetized disk, which rotates together with the internal disk and controls display of digits on an LCD display. When the microcontroller decides that a correct set was entered, it activates an actuating element which drives directly a closing lever, so that the closing lever acts on a drive cam connected to the internal disk in order to withdraw the lock rod through the internal handwheel. The software functions and the power level monitoring cause moving the lever away from the drive cam, to prevent moving the rod back. An integrated bearing and safeguarding components make the locking disks fail-safe.

Another american patent specification No. US 5095724 presents a set of code disks for a coded lock equipped with a series of round disks arranged in a stack to make the closing combination. The lock has a sliding deadbolt and a rotary lever for setting programmed locking and unlocking positions after selection of the proper opening combination.

In an american patent specification No. US 4776190 a coded lock is disclosed of a type adapted to changing the coding combination with a code of changes. It contains a housing of the lock and a stack of loose disk wheels resting on a disk station and capable of being turned about the axis. Each disk contains an annular outer part forming the rim and an inner cylindrical annular part with teeth for connecting the internal part of the hub with a part of the rim at any angular position. Parts of the disk wheel perimeter have especially shaped external slits to

accommodate locking elements when the disk wheels are correctly positioned. The lock is operated by turning a key and simultaneously moving a part of the disk wheel hub along the axis. Working out a novel solution of a coded lock, where magnetic elements form a part of the coding unit, is the objective of the present invention.

A coded lock, according to the invention, is described in claim 1 and in the following dependent claims.

According to the invention the coded lock contains a housing with a sliding deadbolt coupled to a control disk through a mechanism for lock controlling and coding. The control disk is linked to a mechanism for driving the deadbolt base sliding motion and a mechanism for locking and unlocking the deadbolt base, which comprises at least one code disk and at least one magnetic element. The control disk contains an external seat with an internal handwheel, in which a central pushbutton is seated, on which a first sleeve and locking sleeve are mounted. The internal handwheel has a numerical graduation.

According to the invention the coded iock is characterized in that it contains a unit for transferring the sliding motion of the internal handwheel to a rotational motion of the locking sleeve, where the locking sleeve is mated to at least one code disk. Inside the lock there is crank capable of sliding and rotating, whose arm parallel to the symmetry axis of the lock code disks comprises magnetic elements mated to the operating member of at least one code disk.

According to the invention a second sleeve with fixed pins is favorably fastened on the first sleeve, and on that second sleeve a locking sleeve is mounted on an internal spring, the locking sleeve having slanting raceways mated to the pins of the second sleeve.

In a solution according to the invention the locking sleeve contains on its external surface at least one circumferential groove.

The circumferential grooves mated to each code disk end in a favorable version of the solution according to the invention at different points on the locking sleeve perimeter. This means that each circumferential groove covers a different angular longitude of the locking sleeve.

A fourth, open sleeve is mounted on the external surface of the locking sleeve.

That sleeve, made of elastic metal sheet, has on a part of its perimeter the form of at least one arched flat spring, that flat spring having its end bent into a threshold. The flat springs are mated to the locking sleeve grooves.

An outer sleeve, bearing at least one rotary code disk, may be mounted on the fourth sleeve. The code disk is composed of three mated annular components. A carrying disk is the first component of the code disk, an inner ring is the second component of the code disk, and a code ring is the third component of the code disk.

In a further development of the solution according to the invention the carrying disk contains an inner seat, where the internal surface of that seat has two opposite flat surfaces parallel to each other. The inner ring mounted so that it can slide in a direction parallel to the flat surfaces is placed in the carrying disk seat. The inner ring has on its perimeter two sections of flat surface mated to the flat surfaces of the inner seat. The carrying disk has external teeth and internal teeth.

According to the invention a slit mated to a protrusion of the inner ring is made in the circumferential side wall of the carrying disk seat, whereas the inner ring has the external protrusion with teeth whose tips point towards the teeth of the external code ring.

In a favorable version of the invention the code ring has an external arm with an operating member parallel to the symmetry axis of that code ring, the code ring having a toothed outer circumferential edge and a toothed inner circumferential edge.

According to the invention the external seat has a window which favorably contains a fixed shutter in the form of flat lamellae parallel to each other, positioned in planes parallel to the symmetry axis of the control disk.

In the solution of the coded lock according to the invention a magnetic coupling in the code setting position is used instead of a mechanical coupling as usually used in known coded locks. The mechanical coupling of the coding unit in the open position is unfavorable insofar as it may be identified aurally and the instants of reaching the open position by the successive disks may be detected using the method of slow turning. That makes opening a lock with mechanical coupling more likely. A lock with magnetic coupling reaches the coding position of each internal disk without any sound which might come from a purely mechanical system. Therefore the lock according to the invention is a device with a much higher burglary

resistance.

The object of the invention is presented in an embodiment shown in the enclosed drawings, where the respective figures shows:

Fig. 1 - section of the lock along the internal handwheel axis of rotation.

Fig. 2 - section of the lock perpendicular to the section shown in fig. 1.

Fig. 3 - view of the lock control disk.

Fig. 4 - perspective view of the control disk.

Fig. 5 - view of the control disk with the locking sleeve and the second sfeeve. Fig. 6 - view of the lock without the code disk after removal of the cover.

Fig. 7 - expanded view of the lock.

Fig. 8 - perspective view of the lock with the cover removed.

Fig. 9 - section of the lock in the plane of the crank angular arm and the axis of disk rotation.

Fig. 10 -view of the carrying disk from the seat side.

Fig. 11 - view of the inner ring.

Fig. 12 - side view of the inner ring.

The lock according to the invention contains a housing 1 with a sliding deadbolt 2 and deadbolt base 3. The deadbolt base 3 is linked to a control disk 4 via a lock controlling and coding mechanism.

The control disk 4 is is connected with mechanisms for control of deadbolt base sliding and deadbolt 2 base 3 position locking and unlocking. The disk 4 contains a central pushbutton 5 sliding inside an internal handwheel 6. The internal handwheel 6 has a numerical graduation 7, as shown in fig. 5. The internal handwheel 6 is rotationally mounted in a coaxial external seat 8.

The control disk 4 is depicted in fig. 3 in a view along the symmetry axis of the disk, and in fig. 4 in a perspective view. As shown there, in the embodiment described, the internal handwheel 6 rotationally mounted in the external seat 8 has on its perimeter recesses 9 which facilitate turning the internal handwheei 6 and sliding the handwheei 6 along its axis. The external seat 8 has on Its perimeter a window 10, through which the user can see the numerical graduation 7. The numerical graduation 7 together with the internal handwheei 6 allow one to set the code for lock opening as well as change that code. Pressing the interna! handwheei 6 causes rotation of a sleeve 15 with simultaneous locking of the control disk 4.

For clarity the numerical graduation 7 in the window 10 is not shown in figures 3 and 4. The numerical graduation 7 is shown in fig. 5. Figures 3 and 4 show an additional component with which the window 10 is equipped. The window 10 has namely a fixed shutter in the form of flat lamellae 11 parallel to each other, situated in planes parallel to the symmetry axis of the disk 4. Owing to such positioning the lamellae 11 allow an operator looking at the window from above to see the numerical graduation 7, while they block the view of the numerical graduation 7 for an observer looking at the disk 4 from the side when the lock is being coded or decoded.

Figure 5 shows a unit for transferring the sliding motion of the internal handwheei 6 to a rotational motion of the locking sleeve 15. The locking sleeve 15 locks in place code disks 21 , for clarity not shown in this figure. The figure shows the deadbolt base 3 together with the deadbolt 2. As can be seen, a shank 36 of the central pushbutton 5 is mounted in the first sleeve 12. A second sleeve 13 with fixed pins 14 is fastened on said first sleeve 12. On the second sleeve 13 the locking sleeve 15 is mounted on an internal spring 17. The locking sleeve 15 contains slanting raceways 16 mated to the pins 14 of the second sleeve 13. Pressing the internal handwheei once 6 makes, through pins 14, the locking sleeve 15 turn by a definite angle. The locking sleeve 15 contains on its external surface circumferential grooves 18. In the embodiment shown the locking sleeve 15 has three

circumferential grooves 18 covering three different angular longitudes. This means that, as shown in figure 5, each groove 18 ends at a different point of the locking sleeve 15 circumference.

A fourth, open sleeve 19 made of elastic metal sheet is mounted on the external surface of the locking sleeve 15. The fourth sleeve 19 has on a part of its perimeter the form of three flat springs 20. The flat springs 20 have their ends bent into thresholds 37.

In the embodiment described the locking sleeve 15 has three grooves 18, while the fourth sleeve 19 has three flat springs 20. This embodiment of the lock has been designed for use of three code disks 21. A different number of code disks 21 will be used in other embodiments, for instance four code disks 21 , and then the locking sleeve 15 will comprise four grooves 18, whereas the fourth sleeve 19 will contain four flat springs 20. The carrying disk 23 has internal teeth 47 mated to the bent threshold 37 of the flat spring 20 to lock the carrying disk 23 in the chosen position.

An outer sleeve 22, bearing rotary code disks 21 , is mounted on the fourth sleeve 19. Each code disk 21 is composed of three mated annular elements. A carrying disk 23 is the first component of the code disk 21 , on which the other two elements are mounted. An inner ring 24 is the second component of the code disk 21 , and a code ring 26 is the third component of the code disk 21.

The carrying disk 23 is shown in fig. 10. The carrying disk 23 contains an inner seat 38. The internal surface of that seat 38 has two opposite flat surfaces 39 parallel to each other.

The inner ring 24 is mounted in the seat 38 of the carrying disk 23. The inner ring 24 is shown in detail in fig. 11 and in the side view in fig. 12. The inner ring 24 has on its perimeter two sections of flat surface 40. The inner ring 24 is loosely laid in the seat 38. As can be seen in figures 10 and 11 , the flat surfaces 40 of the inner ring 24 and the flat surfaces 39 of the carrying disk 23 seat 38 are mated to each other when the ring 24 is placed in the seat 38. That makes possible shifting the ring 24 inside the seat 38 perpendicularly to the symmetry axes of these components 23, 24 in one direction only, conforming to the direction of the external protrusion 25 of the inner ring 24. The external protrusion 25 of the inner ring 24 comprises teeth 41 , whose tips point towards external teeth of the code ring 26.

The circumferential external side wall of the carrying disk 23 has external teeth 42, which lock in place the code disk 21. As shown in fig. 10, the circumferential side wall of the seat 38 has a slit 43, in which the protrusion 25 of the inner ring 24 can be shifted.

The code ring 26 is the third element of the code disk 21. The code ring 26 has a toothed outer circumferential edge and a toothed inner edge. This is shown in fig. 7.

The code ring 26 is provided with an external arm 27 made, as the entire code ring 26, of steel sheet. The external arm 27 is shown in figures 1 and 9. It can be seen in these figures that the external arm 27 is fastened to the code ring 26 and contains an operating member 28 parallel to the common axis of symmetry of all three code disks 21. Each code disk 21 has the same construction as described above.

A fifth sleeve 29 is rotationally mounted on the first sleeve 1 inside the housing 1 of the lock. A crank 30 is coupled with this sleeve. The crank 30, connected to the internal handwheel 6, can be both turned and shifted along the axis. The sleeve 29 and the crank 30 are shown in fig. 7. Rotation of the crank 30 is restricted by a needle 31.

The crank 30 is depicted in figure 7. The crank 30 contains a sleeve and two radial arms. A straight arm 32 is mated to a protrusion 33 of the deadbolt base 3. The crank 30 has on its other side an angular arm 34, parallel to the symmetry axis of the first sleeve 12 and the remaining sleeves 13, 15, 19 and 29. Three magnetic elements 35 are placed on the angular arm 34. That is shown in fig. 9. As shown in that figure the three code disks 21 are positioned so that the operating members 28 of the external arms 27 are situated within the zones of influence of the respective magnetic elements 35. This position of the lock allows one to set the code for the respective disks 21. The first code digit for the first code ring 26 is set in this position. Afterwards the internal handwheel 6 is pressed, which has the effect of coding the position of said code disk and locking that position. The same operations are subsequently carried out for the remaining code disks 21 in order to set the complete code. For the embodiment described the code consist of three numbers, one number per disk. Thus the code depends on the number of disks, which in other

embodiments can be different than three. Fig. 9 also shows springs 45, 46 mounted in the base 3 of the deadbolt 2 with the purpose of shifting the needle 31. The spring 46 inserts the needle 31 into cutouts 44 of the carrying disks 23. Should the code disks 21 be improperly positioned, the spring 46 will lift the needle 31 , which will couple the needle 31 with the external teeth 42 of the code disk 21 and lock the rotation of disks 21 , so that opening the lock will be made impossible.

The lock can be opened when the disks occupy the proper positions, which means that all disks are in such positions that the cut-outs in the code disks 21 are aligned. Then rotation of the internal handwheel 6 will cause inserting the needle 31 into cut-outs 44 of the code disks 21. Rotation of the internal handwheel 6 to the extreme position, where the straight arm 32 of the crank 30 will move, with the aid of the protrusion 33, the base 3 of the deadbolt 2 to the extreme position, will make opening or closing the lock possible.

List of denotations in the figures.

1. Housing.

2. Deadbolt.

3. Deadbolt base.

4. Control disk.

5. Central pushbutton.

6. Internal handwheel.

7. Numerical graduation.

8. External seat.

9. Recesses.

10. Window,

11. Lamella.

12. First sleeve.

13. Second sleeve.

14. Pin.

15. Locking sleeve.

16. Slanting raceway.

7. Internal spring.

18. Circumferential groove.

19. Fourth sleeve.

20. Flat spring.

21. Code disk.

22. Outer sleeve.

23. Carrying disk.

24. Inner ring.

25. External protrusion.

26. Code ring.

27. External arm. 28. Operating member.

29. Fifth sleeve.

30. Crank.

31. Needle.

32. Straight arm.

33. Deadbolt base protrusion.

34. Angular arm.

35. Magnetic elements.

36. Central pushbutton shank.

37. Flat spring threshold.

38. Carrying disk inner seat.

39. Flat surface of the seat.

40. Inner ring flat surface.

41. Ring protrusion teeth.

42. Carrying disk external teeth.

43. Slit in the side wall of the carrying disk seat.

44. Carrying disk cut-out.

45. Spring.

46. Spring.

47. Carrying disk internal teeth.

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