Cylinder Lock with Coded Key for Blocking the Shaft of the Steering Wheel and Protection of the Motor Vehicle from Theft

Abstract

This invention relates to the cylinder lock with a coded key for blocking the steering wheel shaft and the protection of motor vehicle from theft. The lock consists of the housing (1), which is fastened on the bush (2) placed on the shaft (3) of the steering system, inside of which there is a sliding cylinder (4) with a coded key (5). In the cylinder (4) there is a keyway (14) in which there is peak of the pin (13) fastened in the housing (1). On the core (8) by the linchpin (16) a bush (15) is fastened, on which there is a ring eccentre (17) with the area (18). On the bush (15) there is placed a spiral spring (20). In the housing (1) along the eccentre (17) the pin (19) and the inductive switch (27) are placed. Inside the bush (15) the spiral spring (24) and the piston (25) are placed, while the peak of the piston (25) is fastened by the linchpin inside the piston (26) for locking. The free end of the piston (26) is placed in the keyway (28) of the bush (29) fastened in the shaft (3). In order to unlock, the core (8) is rotated and the cylinder (4) is axially moved. In the unlocked position the ring eccentre (17) is secured by pin (19) and activates switch (27).

Description

TECHNICAL FIELD

The subject of this invention belongs to, generally speaking, the field of traffic and transport, i.e. the field of vehicle equipment. The subject of the invention can also belong to the field of construction, i.e. the field of locks, iron-work and strongboxes, more precisely to the field of locks and equipment thereof. More specifically, the invention belongs to the field of mechanical locks for preventing the shafts or axes from rotating, i.e. for blocking them, even more precisely, to the field of locks for the prevention of vehicle theft.

According to the International Patent Classification (IPC) the subject of the invention has been marked and classified by the basic classification symbols: B 60R 25/02 which refers to the vehicle equipment for the prevention of unlawful use or theft of vehicles impacting the steering mechanism, E 05 B 27/10 referring to the lock cylinder with arresters as pins or balls which are activated by other key parts, i.e. the holes which take in the protruding parts of the arrester, E 05 B 9/04 regarding the key guides, i.e. the pins for key guiding, and E 05 B 65/12 relating to the vehicle locks, E 05 B 11/06 relating to the devices for the prevention of taking out the key from the lock in order to prevent the use of skeleton keys, E 05 B 17/18 relating to the covers and small key hole shields shaped as lids or slides, E 05 B 11/06 relating to the devices for the prevention of taking out of key from the lock for the prevention of use of picklocks.

TECHNICAL PROBLEM

The technical problem wished to be solved by the subject application is how to construct the cylinder lock with a coded key which would absolutely block the shaft of the steering wheel and protect the motor vehicle from theft and in cases of damaging the steering wheel of a vehicle, which would be simple in construction, easy, safe and fast to unlock/lock, absolutely break-proof and with an unlimited number of possible “coding” combinations.

BACKGROUND ART

There are numerous lock solutions presented in patent and non-patent literature. The term lock should denote, apart from the usual door locks of various kinds, the lock for the vehicle steering wheels, as well as all kinds of special locks such as padlocks and other. Theoretically, there are several groups of locks that are different from each other by way of locking/unlocking. There are also locks with rotary keys which move the lamellar arresters perpendicularly to the key, the locks the arresters of which adjust by putting in the key, the lock cylinder in which the slide valve is moved by means other than the key, locks with permutations, locks with display devices or time counters, locks for special purposes, etc. The commonest are the cylinder locks with arresters in the shape of pins or small balls and cylinder locks with lamellar arresters.

One known solution of the lock is the Yugoslav patent application no. P-731/92 in which the cylinder lock made up of a cylinder and a key is presented. The cylinder is profiled as a semi cylinder and contains a cylinder housing that at its upper, essentially round cylinder part, contains longitudinal opening of the core for the installation of the cylinder core. The cylinder core bears the element for locking on its inwardly located end. The rotation of the cylinder core is in that manner conveyed to lock elements. The lock element remains axially immovable in the slit of cylinder housing. The flange part of the cylinder housing extends radially to the round cylinder part. The housing holes through arranged in the succession, which also extend radially to the core of the cylinder, are to be put in the flange part. Their ends, far from the cylinder core, are sealed helped by the keys. These housing holes through serve to hold the springs of keys as well as the keys themselves. The core holes through are oriented radially in relation to the cylinder core to hold the linchpins which are straightened with the housing holes through. The housing keys and the core keys form a limiter which prevents the rotating of the cylinder core and thus the lock elements, too, as the key is not put in. The core wedges move only by putting in the appropriate key in the channel in the cylinder core, so that the special link between the core wedges and the housing wedges is located on the level of the sliding link of the cylinder core.

Another known solution has been presented in the patent document YU PS 45139 entitled “Cylinder Lock with Double Locking of Cylinder”. This solution relates to a cylinder lock with double locking of cylinder in which the locking of the cylinder is achieved from two sides, by different systems of linchpins and lifter by using a profiled key, so that from the lower part of the cylinder the standard system of shutting linchpins and lifters is used, under the influence of springs, and from the above the system of sealing linchpins and lifters placed in the upper part of the vertical plane, which passes through the cylinder axis, and is movable under the influence of the gravitation force. Apart from that, in the middle the cylinder grooves are made into which the plates are put, what serves for the purpose of preventing the unlocking of the upper system by various objects.

Other relevant known solutions are presented in Yugoslav patent applications P-500/98 in which the programmed cylinder lock with main keys is shown, P-1812/80 in which the profiled cylinder lock is presented, P-678/92 presenting the steering wheel lock, P-1487/86 presenting the blocking safety lock for motor vehicles, etc.

Main disadvantages of the known locks, some of which are in the above passage, are complicated construction, possibility of breaking, small number of coding combinations are limitation in use.

DISCLOSURE OF INVENTION

This invention relates to the cylinder lock with a coded key for blocking the steering wheel shaft and the protection of motor vehicle from theft. According to the patent application by the same Applicant no. P-565/03, the cylinder lock with a coded key is also known, this lock consisting of a cylinder which consists of the outer protective covering inside of which there is a housing and coaxially with it, there is a cylinder core placed rotably, in which there is the axially made central opening. In the axis of the said opening there is placed the key-guiding pin. In the body of the housing there are radially made holes through, while coaxially with them in the core other holes through are made. Within the hole through of the housing there are placed springs, plates and sealing plugs, while in the core holes through sliding arresters are placed. The arresters are made as pins and ball pairs. The said pin, which by its free end stretches to the very entrance into the cylinder, which is by its other (left) end fastened in the bush attachment for unlocking placed in the core. The core, the bush attachment and the pin are interconnected by a screw which is radially twisted in the bracket part of the core. The front side of the cylinder, i.e. the side of the penetration of the key, is closed by the safety plate. The key consists of the handle and the body with openings for the penetration of the arrester peaks, while the peak of the body of the key is made with a profiled slope which fits the profile of the attachment. The so-called lock “coding” can, at the same time, be done by a number of arresters, their distribution on the cylinder radially as well as axially over the volume of the housing, by changing of the depth of the penetration of the arresters into the body openings and by the changing of the attachment length.

What represents the novelty of the solution is that inside the housing, which is fastened on the covering provided on the shaft of the steering system, there is provided a sliding cylinder with a coded key. There is a keyway in the cylinder in which there is the pin peak fastened in the housing. On the cylinder core there is fastened a bush on which there is an eccentre with a truncated area, while in the bush there is a spiral spring. Inside the bush there are a spiral spring and a piston the peak of which is fastened in the locking piston. The free end of the said piston is positioned in the bush keyway fastened on the shaft. The cylinder housing of the locking mechanism is fastened on the bush under right angle which is firmly on the shaft of the steering system, while the bush is fastened on the plate for placing on the chassis.

Namely, on the left end inside the housing there is placed a sliding cylinder with a coded key, the cylinder consisting of the outer protective covering inside of which there is a stator, while inside the stator and rotably in it, a core is placed. The covering and stator are fastened to one another by a pin, while the front side of the cylinder is closed with a safety ring. In the cylinder there is a keyway in which the pin peak is placed, while the pin is by its other end fastened in the housing. On the free end of the cylinder core which comes out of the stator a bush is placed, while the core and a bush are radially interconnected by the placed linchpin. From the outside on the bush there is a ring locking eccentre on which there is a truncated area. On the bush a spiral spring is placed, while the spring, by its left end, leans against the rim, while by its right end it is placed on the keyway made in the ring. In the housing, with the said eccentre, the pin is also fastened on the bush. Also, with the said eccenter and the pin, an inductive switch is placed which is activated by the eccenter. Inside the wedge, which is limited from the left hand side by the front part of the core, and from the right hand side by the wall in which an opening is made, a spiral spring and a piston are placed. The piston peak, which penetrates the opening made in the wall and is outside the bush, is placed axially inside the hole made in the locking piston, while the piston peak and the locking piston are interconnected by the radially placed linchpin. The free end of the locking piston, which penetrates the openings made in the bushes, is placed in the keyway made axially in the bush which is fastened on the shaft through one or two radially placed linchpins.

The object of this invention is to enable the making of the cylinder lock safe while blocking the steering wheel shaft for the following purposes: a) the protection of motor vehicle from theft and the cases when it comes to the damaging of the vehicle steering wheel, and b) to additionally disable the engine ignition by possessing the inductive switch connected to the ignition relay. The lock would be of simple construction and absolutely break-proof.

The invention—the cylinder lock with a coded key for blocking the shaft of the steering wheel and the protection of motor vehicle from theft of this patent application, has many advantages, some of which are:

• • assured blocking of the shaft of the steering wheel and the protection of motor vehicle from theft and in cases of damaging the steering wheel of a vehicle,
  • allows the engine ignition only upon the unlocking of the lock and taking out of the key,
  • simple construction,
  • construction and use of the top quality material do not allow the revelation of the “code”,
  • unlimited number of “coding” combinations,
  • practically and absolutely impossible to break or “comb”,
  • easy to install and maintain,
  • practically unlimited duration,
  • functionally very practical and reliable, safe in operation,
  • can be serially manufactured,
  • geometrically ideal in shape and of small contour dimensions.

BRIEF DESCRIPTION OF DRAWINGS

For the purpose of easier understanding of the invention, as well as to demonstrate how it can be materialised in practice, the Applicant refers to the attached drawing in which:

FIG. 1 presents the cylinder lock with a coded key for blocking the steering wheel shaft and the protection of motor vehicle from theft of the invention, in general view, partial intersection and perspective view,

FIG. 2 presents the cylinder lock of FIG. 1 in locking stage, in vertical intersection and perspective view,

FIG. 3 presents the lock of FIG. 2 in the unlocked stage and the key taken out, in vertical intersection and perspective view,

FIG. 4 presents the lock of FIG. 3 in locking stage, in vertical intersection; and

FIG. 5 presents the lock of FIG. 3 in the locked stage, in vertical intersection and in perspective view.

DETAILED DESCRIPTION OF THE INVENTION

What is necessary to mention before the very detailed description of the cylinder lock is that the solution of the invention is presented only as one in a sequence of possible combinations of materialisation and therefore it should be deemed only one of the examples.

The cylinder lock with a coded key for blocking the vehicle steering wheel shaft and the protection of motor vehicle from theft, of the invention and FIGS. 1 through 5, consisting of a housing 1, within which there is a locking mechanism and a bush 2 by which the lock is fastened on the shaft 3 of the steering system. The housing 1 is put and fastened on the bush 2 under right angle. On the bush 2 a plate 31 is fastened, FIG. 1, by which the cylinder lock of the invention is fastened on the vehicle chassis.

Inside the cylinder housing 1, on its left end, the cylinder 4 with a coded key 5 is installed to slide. Cylinder 4 consists of the outer protective covering 6 in which there are put—“packed” the appropriate subassemblies and cylinder elements. Inside the covering 6, there is a firmly installed housing—stator 7, while inside the stator 7, coaxially with it and rotably in it, there is installed a cylinder rotor—core 8. The covering 6 and the stator 7 are fastened one to another by the pin 9. The front side of the cylinder 4, i.e. the side of the insertion of the key 5, is closed by the safety ring 10 which is most favourably welded to the covering 6. In this manner it is made impossible to “pull out” the cylinder mechanism from the covering, so the ring 10 at the same time also represents the safety element to prevent the lock breaking.

The cylinder 4 with a covering 6, FIGS. 1 and 2, is axially inserted to slide in the housing 1 and is guided by the guiding pin 13. This pin 13 is by one end fastened in the housing 1, while by its other fee end it is inserted in the keyway 14 consisting of a slot made in the covering 6 and a channel made in the stator 7. On the free end of the core 8, which comes outside the stator 7, axially with the core 8 there is installed a bush 15. The free end of the core 8 and the bush 15 are radially interconnected by the installed linchpin 16. From the outer side of the bush 15 there is a ring eccentre 17 for locking which is made with a truncated area 18. Along the side area of the eccentre 17, and in housing 1, there is fastened the pin 19 to which the eccentre 17 leans in the unlocked and locked position. Also, from the left hand side of the pin 19 on the housing 1 there is also fastened the inductive switch 27. On the bush 15 and its right end there is positioned a spiral spring 20 for axial returning—“ejecting” of the cylinder 4 while unlocking. The left end of the spring 20 leans against the eccentre 17, while the right end of the spring is placed in the keyway 21 made in the ring 22.

Inside the bush 15, which is limited on the left hand side by the front of the core 8, and from the right hand part by the wall 23 in which an opening is made, a spiral spring 24 is placed, as well as the piston 25. The peak of the piston 25, which penetrates the opening in the wall 23 and is outside the bush 15, is placed axially inside the hole made in the piston 26 for locking. The peak of the piston 25 and the piston 26 are interconnected by a radially placed linchpin. The free end of the piston 26 penetrates the opening made in the bush 22 and enters the keyway 28 made axially in the bushes 2 and 29. The bush 29, placed in the shaft 3 inside the cylindrical protective lining 30, serves in certain vehicle types to bridge the difference between the diametre of the standard bush 2 and the shortened diametre of the shaft 3 for vehicle steering, so here it is presented only as an example. The bush 29 is fastened from the axial movement along the shaft 3 on the appropriate place on the shaft 3, most favourably by sticking.

The very cylinder 4, according to the patent application no. P-565/03 by the same Applicant in Serbia and Montenegro will not be described in detail because it is not the subject of the invention. However, it should be emphasised that in the body of the stator 7 several openings, i.e. holes through, are made, the axes of which are placed radially. In this case the axes of all holes through are, in relation to the axial axis, placed normally and in a sequence along the stator 7. The holes through are placed in certain number of rows with several holes through, while their axes do not have to be placed in the same axial plane. The holes through in the stator 7, which are of the longer diametre and greater radial depth, immediately before the core 8 transfer into the holes through of shorter diametre and lesser radial depth so that in the lower part of the hole through it achieves the point of support as a ring. Inside the hole through there can be placed the springs which from the outside lean against the plates, and on the inside they lean against the outside of the upper part of the body of the sealing plugs. The sealing plugs are in the cross section made in the shape of letter T. The plates on the opposite side of the springs lean against the covering 6. The plugs are radially placed to slide in the hole through by the upper part of the body of a larger diametre, while by the lower part by the body of the shorter diametre they are placed in the hole through of a shorter diametre. By the lower parts of their bodies—the wedges, the sealing plugs penetrate the hole through of the shorter diametre, exit the stator 7 and enter the holes through made in the core 8. Also, the plugs, by their lower areas of the body, lean coaxially against the arresters which are made as wedges, or as ball pairs, or in combination. The arresters are all placed to slide inside the holes through made in the core 8. As the arresters as wedges, i.e. balls, are placed in the holes through made in the core 8, the holes through are obviously placed coaxially in relation to each other. The wedges can be/are of different length, by what the possibility of additional “coding” of the lock is achieved.

As it has already been said, apart from the possibility that the distribution of the said holes through be changed in various manners over the volume of the cylinder 4 and in axial and radial direction, as well as their total number, in that manner the distribution and the number of holes through with wedges, i.e. balls, can be varied/combined. In this manner one can achieve a greater number of coding combinations, facilitate the lock functioning and additionally disable any unlawful opening, through what a cylinder lock practically and absolutely break-proof is achieved.

The free wedge peaks, i.e. the inner balls, which penetrate the holes through and get out into the opening, lean freely on the pin which is placed in the central axis within the opening of the core. As the contact lines of the plugs and wedges, i.e. the contact lines of plugs and balls, are moved radially in relation to the contact line of the stator 7 and the core 6, the lock is being locked in that manner. The pin 11, as FIG. 3 clearly shows, by its left free end stretches until the very entrance into the cylinder 1 and serves both for guiding the body 5′ of the key 5 and for blocking the entrance so that the “breaking device” cannot be inserted into the lock in an attempt of breaking it.

The pin 11 is, with its other (right) end, fastened in the bush for unlocking, while the bush is fastened in the core 8 inside the opening 12. The core 8, the unlocking bush and the pin 11 are tightly interconnected with a screw which is radially twisted in the bracket part of the core 8. The screw penetrates the bush and by its end penetrates the keyway made in the pin 11. In this manner the screw fixes the pin 11 in that position.

The key 5 for the cylinder 4 is of special design, FIG. 2. The key consists of the handle and the body 5′. The body is cylindrical with a thin wall in which there are radially made openings for the penetration of the peaks of the said wedges, i.e. balls. The axes of the openings fit with the distribution and axes of the holes through in the cylinder 4, i.e. with eight wedges, i.e. balls. The peak 5″ of the body 5′ of the key is made with the profiled slope which is adjusted for the firm grip with a slant of the same profile made on the front side of the unlocking bush.

The manner of functioning of the cylinder lock of the invention is simple and in the obvious manner comes from the previous description and figures, so it does not need to be described in detail. The cylinder lock is, as it has been presented in FIG. 3 clearly, in the unlocked stage. In order to achieve this, the body 5′ of the key 5 is put in—inserted into the opening 12 of the core 8 and the key is guided along the pin 11. Because of the small gap between the core 8 and the pin 11, the body 5′ is centered and guided to the unlocking bush. The thickness of the key body is only slightly less than the gap, i.e. the channels which form the core 8 and the pin 11 in the opening 12, so that the body 5′ of the key is in a fine and smooth manner guided along the opening 12 and the pin 11. As it enters the opening 12 the peak 5″ of the body 5 meets the peak of the first wedge, i.e. ball, lifts them overcoming the spring resistance, making the way free to the peak to the following wedge, i.e. ball, and so on. While the key is sliding along the pin 11, the wedge peaks, i.e. balls, slide along the outer surface of the body 5′. As the insertion ends, the key by its peak 5″ leans against the front side of the unlocking bush and by its profiled slope penetrates the engagement with the same profiled slope made in the bush. In this position all wedges, by their peaks lean against the body 5′ of the key. By further turning of the key 5 for a relatively small radius in one moment there comes to the fitting of axes of each of the openings on the body 5′ with the axes of the appropriate wedges, i.e. balls. At that moment all wedges, i.e. balls, through the sealing plugs which are influenced by the springs, at the same time are inserted in the openings on the body 5′ of the key. As the peaks of the wedges, i.e. balls, and their projection into the appropriate openings on the key body to certain depth, there comes to the placement of lines—touch points of the plugs with the arresters and the touchline of the stator 7 and core 8 into the same plane, by what the lock is put into the unlocked state. In this manner the core 8 is made free and becomes mobile inside the stator 7. By further turning of the key 5 and the impact of the profiled peak 5″, to the profiled bush there turns the core 8, and with it the bush 15 by which the core is connected through the linchpin 16.

In the unlocked stage, FIG. 3, the cylinder 4 is in the “pulled out” position, i.e. the ultimate left hand side position under the impact of the spring 20 and secured in that position by the eccentre 17 which leans against the left hand side onto the pin 19. As the core peak 8 and the bush 15 through the linchpin 16 are connected, thus the bush 15 is placed on the ultimate left hand side position. The pulling away of the bush 15 induces the pulling away of the piston 25, by leaning the wall 23 onto the head of the piston 25 and the piston 26 through the linchpin which connects them. In this manner the peak of the piston 26 is found in the ultimate left hand side position and is pulled out of the keyway 28 made in the bush 29, so the cylinder lock is unlocked, and the shaft is free and movable. In this way the inductive switch 27 is also stirred and turned on by the impact of the eccentre 17, what causes the flow of electricity to the assisting switch relay, what enables the start off and the ignition of the engine.

For the purpose of locking, FIG. 5, it is necessary to perform the locking actions shown in FIG. 4. By turning the key 5, which is placed in the pin 11 and by its profiled peak 5″ leans against the bush at the bottom of the opening 12, the core 8 also turns, and with the core 8 the bush 15, since they are interconnected by the linchpin 16. By turning of the bush 15, the eccentre 17 also turns by sliding along the side area over the pin 19. At the moment when the eccentre 17 by its truncated area 18 comes to the end of the pin 19, the bush 15 is axially set free and “passes” over the pin peak 19. By further pushing of the cylinder 4 axially to the left hand side, the entire cylinder 4 moves by sliding within the housing 1 to the right. This transfer equals the length of the keyway 14 in which the pin 13 is led, so that the pin from the ultimate right hand side position is led to the ultimate left hand side in relation to the keyway 14. The eccentre 17 “skips” the pin 19, moves onto the right, while the hole through spring 20 is pressed. The piston 25 under the influence of the inner spring 24 pushes the piston 26 which by its end penetrates the keyway 28 of the bushes 2 and 29. By further turning of the key 5, i.e. the core 8, the eccentre 17 by its side area leans against the pin 19 from the right hand side and is placed in the position securing the entire mechanism and locking presented in FIG. 5. In this manner the eccenter 17 also moves away from the inductive switch 27 which it cannot influence anymore, and by that the engine is additionally secured from the possible ignition before the complete unlocking. The key is then turned for further 90° backwards and taken out leaving the lock locked. The unlocking is done in the aforedescribed manner.

The construction characteristics of the lock and the said possibilities of achieving the “coding” provide the innumerable combinations and disable the “decoding”. Also, the construction characteristics of the lock consisting of the narrow channel between the opening 12 and the pin 11, the position of the locking bush at the bottom of the opening 12 and its inaccessibility, top quality of materials for the parts, especially the safety ring 10, the precision in making, and its being break-proof because of the large number of combinations, make the lock both practically and absolutely safe from breaking. The special place in which the lock is put, i.e. on the shaft 3 of the steering system, additionally and absolutely prevents the steering, even at the cost of breaking, and pulling out of the steering wheel from the shaft where it is placed together with some other kind of protection system, such as “claws”, “paws” or levers.

The materials which are used for the making of this lock are highly alloyed steels which possess special quality of mechanical hardness and resistance to any kind of breaking, so that when this lock is in question, it is clear that it is about a device for locking of the highest degree of security.

Regarding the purpose, the lock is universal because neither the materials, nor dimensions limit it.

INDUSTRIAL AND OTHER APPLICABILITY

The method of application obviously comes from the previous text, i.e. no special knowledge, directions for use or experience are necessary for the industrial use in order to apply the invention successfully. Only such knowledge in the field owned by the average artisan is necessary and sufficient to apply the invention successfully, based on the description. The inventor has checked all characteristics of design and function of the invention on the prototype.

Also, any technological improvements or changes in construction that would be in the scope of the said and for the purpose of its improvements are deemed covered by this invention.

Claims

1. A cylinder lock with a coded key for blocking the shaft of the steering wheel and the protection of a motor vehicle from theft the characteristics of which are that on the left end inside the housing (1) there is a sliding cylinder (4) with a coded key (5), where the cylinder (4) consists of the outer protective covering (6) inside of which there is a stator (7), while inside the stator (7) and rotably to it, the core (8) is placed, while the covering (6) and the stator (7) are interconnected by the pin (9) while the front side of the cylinder (4) is closed by the safety ring (10), characterised in that inside the housing (1), which is fastened on the bush (2) placed on the shaft (3) of the steering system, there is an axially placed cylinder (4), that in the cylinder (4) a keyway (14) is made in which the peak of the pin (13) is placed and fastened in the housing (1), that in the core (8) of the cylinder (4) a bush (15) is placed on which there is a ring eccentre (17) with the area (18), while on the bush (15) a spiral spring (20) is placed, that in the housing (1) along the eccentre (17) the pin (19) is fastened with the inductive switch (27), that inside the bush (15) the spiral spring (24) and the piston (25) are placed, that the peak of the piston (25) is fastened in the piston (26) for locking and that the free end of the piston (26) is placed in the keyway (28) of the bush (2,29).

2. The cylinder lock of claim 1, characterised in that in the lower part of the cylinder (4) there is an axial keyway (14) in which the peak of the pin (13) is placed, while the pin (13) is by its other end fastened in the housing.

3. The cylinder lock of claim 1, characterised in that on the free end of the core (8) which comes out of the stator (7), a bush (15) is placed, while the core (8) and the bush (15) are radially interconnected by the placed linchpin (16), and that from the outside of the bush (15) there is a ring eccentre (17) for locking on which a truncated area (18) is made, and that from the outside on the bush (15) a spiral spring (20) is placed, while the spring (20) by its left end leans against the eccentre (17), while by its right end it is placed in the ring keyway (21) made in the ring (22) and that in the housing (1) along the eccentre (17) the pin (19) is fastened, while along the pin (19), from its left hand side, the inductive switch (27) is fastened.

4. The cylinder lock of claim 3, characterised in that the inside of the bush (15), which is limited from the left hand side by the front part of the core (8), and from the right hand side by the wall (23) in which there is an opening, the spiral spring (24) and the piston (25) are placed.

5. The cylinder lock of claim 1, characterised in that the peak of the piston (25), penetrating the opening made in the wall (23) and placed outside the bush (25), is placed axially inside the hole made in the piston (26) for locking, while the peak of the piston (25) and the piston (26) are interconnected by the radially positioned linchpin and the free end of the piston (26), which penetrates the openings made in the bush (29) and the bush (2), placed in the keyway (28) made axially in the bush (29), while the bush (29) is fastened on the shaft (3).

6. The cylinder lock of claim 1, characterised in that the cylindrical housing (1) of the locking mechanism is fastened in the bush (2) radially and under right angle onto the central axis of the bush (2) which is fastened on the covering (30) of the shaft (3) of the steering system, while from the opposite side on the bush (2) a plate (31) is fastened for putting the lock onto the vehicle chassis.

7. The cylinder lock of claim 4, characterised in that the peak of the piston (25), penetrating the opening made in the wall (23) and placed outside the bush (25), is placed axially inside the hole made in the piston (26) for locking, while the peak of the piston (25) and the piston (26) are interconnected by the radially positioned linchpin and the free end of the piston (26), which penetrates the openings made in the bush (29) and the bush (2), placed in the keyway (28) made axially in the bush (29), while the bush (29) is fastened on the shaft (3).