Technical field

The invention relates to the arrangement of the key for controlling the lock with a cylindrical plug and furthermore a lock for validating this key.

Prior art

The closest document of the prior art for the subject of the submitted invention is the published international patent application WO 2015/051475 Al that describes the arrangement of the key for controlling the lock with a cylindrical plug and, furthermore, the lock for validating this key. The key shank consists of a hollow enclosed body where in the internal surface of the shank cavity is a shaped coding track, possibly a coding channel. The lock for validating the key includes a blocking arm with a reference to the coding track or channel. The key shank consisting of a hollow enclosed body with coding elements is also described in patent documents US 587603 and US 494340. The disadvantage of these arrangements is the limited number of lock combinations on the order of up to several tens of thousands.

Principle of the invention

The task of the submitted invention is to especially increase the level of security, distribution, and the combination capability of keys for locks with a cylindrical plug so that code reading is prevented or made maximally difficult.

The subject of this invention is a key for controlling a cylindrical plug and,

furthermore, a lock assembly with at least one cylindrical plug, rotatable in its housing, where in the plug body in its outer longitudinal groove is situated a sprung sidebar, which is pushed to the inner surface of the housing.

The principle of the invention consists in the key shank body being in at least a part of its length formed by a hollow partially enclosed profile, the outer round surface of which is shaped so that the key shank is rotatable in the lock cavity, while at least in the end part of the lateral section of the shank an open cavity is created for inserting an arm of the validating lever of the lock.

At least a part of the shank may be created in the U- or V-shape, while in at least one such part of the shank, the bottom and/or the wall of the inner and outer arch of the shank is fitted with at least one open coding track and/or at least one coding channel with a shaped coding surface.

The shape and/or the dimensions and/or the position of the open shaped coding track and/or coding channel change in the direction of key insertion in the

longitudinal axis of its shank.

In the partially enclosed key shank profile, there may be at least two coding channels that have tracks mutually separated or intersecting.

On the outer surfaces of the key shank, additional coding elements in the shape of dimples or holes and/or grooves may also be shaped.

The subject of this invention is also a lock for verifying the authorisation of the aforementioned key, where the lock contains at least one cylindrical plug with a cavity for inserting a hollow, partially enclosed profile of the key shank, where the shank body is at least in a part of its length formed by a hollow, partially enclosed profile, the outer round surface of which is shaped for turning the key in the lock's cavity. At least in the end part of the lateral key section, an open cavity is created for inserting the lock validating lever's arm. The cylindrical plug is rotatable in its housing while in the plug body, a sprung sidebar of the lock is situated in the outer longitudinal groove, pushed to the inner surface of the housing. The sidebar is adapted for inserting into the turning validating levers that are arranged in a row in the longitudinal axis of the plug on the pivot in the plug and they are located in the lateral slots along the plug's length. These validating levers are in the blocked functional state in case of incorrect coding of the key, preventing the insertion of the sidebar into the groove in the plug, thus turning the plug inside the lock housing, while in the unblocked state in case of correct key coding, they are in the functional position allowing for the movement of the sidebar in the direction into the groove in the plug and thus turning the plug inside the lock housing, while the validating levers at least protrude into the key's cavity, which allows for achieving contact between the validating levers and the code carriers, which are the coding tracks or channels in the key.

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Every validating lever is formed by a two-arm lever where the shaped blocking end of this lever is adapted for inserting the sidebar, while the shaped end of the other arm of this lever, possibly its stump, is shaped for contact with the code carriers in the key.

The first, blocking, arm of the two-arm lever of the turning validating lever may be fitted with a protrusion for putting on a pushing spring situated inside the plug.

The end of the other, coding arm of the two-arm lever of the validating lever may be shaped into a stump or a bill for contact with the open coding track or coding channel in a part of the inner wall of the partially enclosed key shank.

The blocking system contains the bar that is movable in the unblocked state between the bottom of the groove created in the lock housing and the slot in the blocking arm of the validating lever.

The lock contains at least a blocking pin adapted for ejecting into contact with the coding dimple of the key using a spring that is possible to insert into the sidebar, while the blocking pin is in case of incorrect key coding in the blocked functional state in a position preventing complete insertion of the sidebar into the groove in the plug and thus the turning of the plug inside the lock housing, while in the unblocked state in case of correct key coding, it is in the functional position allowing for moving the sidebar into a position in which the sidebar nose is inside the contour of the lock plug, and thus the turning of the plug inside the lock housing.

An advantage of the presented invention is especially such coding that is located in the inner cavity of the key shank and that prevents scanning the key using known means (a 2D or 3D scanner) and significantly limits the possibility of visual code reading. An advantage of the described invention is also the high resistance of the key against bending and twisting, given by the shape of the hollow beam with a round surface, and the high number of combinations of the lock, with which the key cooperates.

Description of the drawings

Examples of the lock assembly and the key for its control can be seen in the attached drawings. In Fig. 1 in the axonometric view, a key for lock control according to this invention is shown; Fig. 2 shows this key according to Fig. 1 in the lateral

perpendicular section. Fig. 3 shows the cylindrical plug of the lock with one of the turning blocking levers in the face view in a partial perpendicular section, where one arm of its two-arm lever is pushed by a spring into mesh with the coding surface in the key wall and its other arm is in the functional position where it fits with its recess into the sidebar that does not exceed the outer perimeter of the cylindrical plug, which allows for free turning of the plug in the plug housing body.

In Fig. 4 there is the cylindrical plug assembly in the lock housing, with an inserted key according to Figs. 1 and 2, at the moment when the turning of the blocking lever in the position given by the height of the coding surface in the bottom of the U- shaped end part of the key profile does not allow for inserting the sidebar into the recess of the blocking lever and thus the turning of the plug in the housing.

Fig. 5 shows the assembly according to Fig. 4 in the position of the blocking lever that allows for inserting the sidebar into the recess in the lever and thus the turning of the entire plug.

In Figs. 6 and 7 show the key according to Fig. 1 in the design where its coding surface is created in the surface of the bottom of the U-shaped profile sides.

Figs. 8 and 9 show the key according to Fig. 1 in the design where its coding surface is created in the groove in the inner arch wall of the key.

Figs. 10 and 11 show the key according to Fig. 1 in another design where its coding surface is created in the inner wall of the U-shaped profile of the key, which is better hidden inside the key shank and reading its code is more difficult. Fig. 12 shows three designs for comparing the visibility of the coding surface in the key, at the bottom is the variant with the coding surface in the bottom of the U- shaped profile, in the middle is the coding groove in the wall of the inner arch of the key, and at the top is the partial coding surface in the inner wall of the U-shaped profile.

Fig. 13 shows various shape variants of the key shank profile in a section.

In Fig. 14 the design of the blocking lever for the profile of the key shank is shown, where the outer rounded surface of the coding lever corresponds with the rounding of the inner cylindrical surface of the cylindrical plug and the coding surface is located in the bottom of the shank profile, possibly, the coding groove is created in the shank profile wall and it is read by the coding lever bill.

In Fig. 15, groove coding is shown, located in the inner arch of the hollow semi- enclosed key, in the position where the coding lever is turned using a bill protruding into the coding groove and where this lever is turned so that the slot in the lever matches the position of the sidebar and the plug may turn in the lock housing.

In Fig. 16 there is the axonometric view of the lock plug with the sidebar and the slots for the coding segments; in Fig. 17 there is a view of the lock plug according to Fig. 16 with a preloaded sidebar placed on the coil springs, and Fig. 18 shows the design according to Fig. 17 in the longitudinal section.

In Fig. 19 there is the comparison of two designs of the blocking levers, and in Fig. 20 there are the basic variants of the blocking lever shapes, depending on the sidebar placement. In Fig. 21 A there is a key where additional coding elements in the shape of dimples or holes and/or grooves on the upper part of the shank and additional dimples on the bottom side of the key shank are shaped in the outer surface of its shank (Fig. 21 B).

In Fig. 22 there is a view from the inside of the key, where two coding channels with mutually separate tracks (Fig. 22 A), possibly intersecting tracks (Fig. 22 B), are in the semi-enclosed profile.

Fig. 23 shows a section of the sprung blocking pin controlled by a dimple created on the bottom side of the key shank. The blocking pin cooperates with the sidebar and in case of an incorrect code on the bottom side of the shank, it prevents the insertion of the sidebar into the longitudinal groove created in the lock plug and thus prevents the turning of the plug in the lock housing.

Examples of implementation of the invention

In the following description, the lock assembly and the key for its control are described. The lock contains one or two cylindrical plugs 1, where each of them is placed in its housing 2. In the plug body 1, a sprung sidebar 3 (see Fig.s 3, 4, 5, 15, 16, 17, and 18) is situated in the outer longitudinal groove, pushed by two springs 22_(placed in the cylindrical openings in the plug 1 of the lock) with its front pause 24 (nose-shaped) to the inner surface of housing 2 into the blocking position. The sidebar 3 is fitted with recesses for coil springs 22, which are seated into the bottom of the longitudinal groove 23 for the sidebar 3 into a radically externally ejected position.

With the sidebar 3, the turning blocking levers 5 cooperate, arranged in a row next to each other on a common pivot in the plug 1 and they are situated in lateral slots 6 along the length of the body of the plug 1 (Figs. 16, 17, and 18).

Every blocking lever 5 is formed by a two-arm lever, where, in the release functional position of the dividing surface between the plug 1 and the housing 2 of the lock, the sidebar 3 fits into the shaped end of the first arm 7 of this lever for allowing the turning of the plug 1 inside the housing 2 of the lock (Figs. 3, 5, and 15). The shaped end of the other arm 8 of this lever is with an advantage under the thrust of the pushing spring 14 in contact with the shaped surface of the coding track 9 (or channel 18) in a part of the inner wall of the semi-enclosed hollow shank 10 of the key 11 (Figs. 5 and 15). The pushing spring 14 is put on the stump 13 of the first arm 7 of the two-arm lever of the turning blocking lever 5 (Figs. 3 and 4). In case every turning blocking lever 5 is turned correctly, pushing of the sidebar 3 into the recess in the blocking lever 5 is allowed at a depth so that the sidebar 3 does not exceed the outer perimeter of the plug 1 and thus allows for free turning of the plug 1 in the body (housing 2) of the cylindrical plug 1. The basic shapes of the blocking levers 5 are shown in Fig. 20; they are chosen depending on the location of the sidebar 3 and the longitudinal groove 4 in the plug 1. The angular position of the longitudinal groove 4 in the housing 2 and the corresponding location of the sidebar 3 in the plug 1 is general. The shaping of the blocking levers 5 corresponds to the requirements for their functionality, strength, minimum material consumption, and manipulation prevention capabilities (so-called picking). Fig. 19 shows a comparison of two designs of blocking levers 5. On the right side of Fig. 19, the blocking lever 5 is turned by the protrusion or bill 15 protruding into the coding groove or channel 18. On the left side of Fig. 19 the blocking lever 5 is turned by the contact between the wavy coding track 9 and the edge of the lever 5.

Figure 4 shows the assembly according to this invention at the moment when the position or turning of the blocking lever 5 (which is given by the height of the wavy surface of the coding track 9 at the given point of the shank 10 of the key 11), pushed by the pushing spring 14 to the external surface of the coding track 9, does not allow for inserting the sidebar 3 into the recess in the blocking lever 5. The sidebar 3 remains ejected from the contour of the plug 1 and protrudes into the longitudinal groove 4 in the inner surface of the housing 2. Subtle turning of the plug 1 in the housing 2 is in this case only allowed within the range of the clearance between the sidebar 3 and the longitudinal groove 4 in the inner surface of the housing 2.

The position or turning of the blocking lever 5, shown in Fig. 5 (which is given by the height of the wavy surface of the coding track 9 at the point of the key shank 11 in question), pushed by the pushing spring 14 to the external surface of the coding track 9, allows for inserting the sidebar 3 into the recess in the blocking lever 5 and thus also the turning of the entire plug 1.

The key 11 for controlling the lock according to this invention has a shank 10, the body of which is at least in a part of its length formed by a hollow semi-enclosed profile with an open cleft 19 for inserting one arm (the first arm 7) of the two-arm lever of every turning blocking lever 5. The key 11 may be made of metal, glass, ceramics, plastic, stone and/or wood (composite with wood contents). The body of the shaft 10 is symmetrical against its longitudinal axis, with an advantage. The head of the key 11 has a thickness of approximately 3 mm, its steel shank 10 has a length of 25-35 mm, width of 10-13 mm, and wall thickness approximately 0.5-2 mm.

In one of the possible designs, the shank 10 of the key 11 has an external rounded surface 16 (Figs. 1 and 2), where its rounding at least in a part of this rounded surface 16 corresponds to the rounding of the inner surface of the housing 2 of the cylindrical plug 1 of the lock. Both sides of the shank 10 of the key 11 are U-shaped and its bottom with a width of approximately 2-2.5 mm or the inner wall of this part of the shank 10 is fitted with a shaped coding track 9 (or channel).

In another design of the key 11 (Fig. 14), the external rounded surface 16 of its shank 10 is concentric with the rounding of the inner surface of the housing 2 of the cylindrical plug 1 of the lock, where the side part of the shank 10 is formed in the U- shape, while in this part the bottom or the wall of the inner or outer arch of the shank 10 is fitted with a coding channel 18 or a groove.

In the outer surface of the shank 10 of the key 11, additional coding elements in the shape of dimples or holes 20 and/or grooves 21 may be shaped (see Fig. 21). In the semi-enclosed profile of the shank 10 of the key 11, there may be at least two coding channels with separated or intersecting tracks 9 (see Fig. 22).

The sidebar 3 is furthermore adapted for cooperation with the vertically placed blocking pins 25, which are located in the vertical openings in the plug 1 and are pushed by the springs 26 into contact with the coding dimples 20 located on the external surface of the shank 10 of the key 11 (Fig. 23). Upon inserting a key with an incorrect code 20 on the external surface of the shank 10 of the key 11, it is impossible to move the sidebar 3 into the position in which the sidebar nose 24 is inside the contour of the lock plug 1, and in which the turning of the lock plug 1 inside the lock housing 2 is allowed. The blocking system of the lock may also contain at least one blocking pin 25 (see Fig. 23), which is adapted for ejecting into contact with the coding dimple 20 using the spring 26 and cooperating with the sidebar 3.

The key 11 may also contain additional coding based on the principle of at least one electronic, magnetic, or biometric sensor or their combinations. It may also include an electronic device serving for generating energy based on the key movements during its use.

List of reference numerals

I... plug

2... housing

3... sidebar

4... longitudinal groove in the inner surface of the housing

5... validating levers

6... plug body slots

7... first (blocking) arm of the two-arm lever of the validating lever 8... second (coding) arm of the two-arm lever of the validating lever 9... open coding track

10... key shank

II... key

12... key shank end

13... blocking lever two-arm lever arm stump

14... spring

15... protrusion or bill

16... outer key shank round surface

17... U-shaped key shank part

18... coding channel

19... cleft

20... coding dimples (in the key shank outer round surface 16) 21... coding groove (in the key shank outer round surface 16) 22... coil spring

23... groove in the lock plug 1 for inserting the sidebar 3

24... sidebar 3 nose

25... blocking pin

26... blocking pin spring