WO1995014369A2

WO1995014369A2 - Locking device of improved features

Info

Publication number: WO1995014369A2
Application number: PCT/HU1994/000052
Authority: WO
Inventors: János FEHÉRDI
Original assignee: Feherdi Janos
Priority date: 1993-11-22
Filing date: 1994-11-22
Publication date: 1995-06-01
Also published as: WO1995014369A3; HU214809B; HU9303302D0; HUT76308A

Abstract

The invention relates to a locking device of improved features, that includes: a casing assembled of a tray, a cover and a front panel provided with a cutoff; a lock blade accommodated inside the casing, suitable to be protruded thereof partially through the cutoff of the front panel; furthermore, a locking element e.g. insertion piece that can be encased into the casing; as well as an operating device inserted between the lock blade and the locking element; having the said operating device a driving ring provided with split and skirt to enclose the locking element, and a transmission subassembly as the case may be; having at least either the lock blade or the transmission subassembly a connection zone while being the driving ring connected either directly through the connection zone or by means of the transmission subassembly to the lock blade in a manner to enable the motion to be transferred. The characteristic feature of the invention is, that a socket (12c) is indented into at least one end of the contact surface (12g) neighbouring the split (12e) of the skirt (12f) that forms part of the driving ring (12), the connection zone (6) has a single exsection (6c) bordered by a primary switching element (6a) and a secondary switching element (6b), and at least the secondary switching element (6b) has a connecting part (62b) in its connection side (61b) near the driving ring (12), being the shape of said connecting part (62b) adapted to the contact surface (12g) of the skirt (12f) on the driving ring (12).

Description

Locking device of improved features

This invention relates to a locking device of improved features that includes a casing assembled of a tray, a cover and a front panel provided with a cutoff; a lock blade accommodated inside the casing, suitable to be pushed out thereof partially through the cutoff of the front panel; furthermore, a locking element e.g. insertion piece that can be encased into the casing; as well as an operating device inserted between the lock blade and the locking element; having the said operating device a split driving ring provided with skir to enclose the locking element, and a transmission subassembly as the case may be; having at least either the lock blade or the transmission subassembly a connection zone while being the driving ring connected either directly through the connection zone or by means of the transmission subassembly to the lock blade in a manner to enable the motion to be transferred.

Various kinds of locks have been used for centuries, for the purpose of locking doors and windows in a safe manner. As a result of continuous development in the requirements, the locks were subject to significant changes by our times.

An important requirement relating to the locking devices used at present is, that they will be of minimum structural depth, i.e. the minimum distance between the front panel and rear panel of the casing, together with the possibility of accommodating a lock blade of thickness as high as possible that can be protruded from the casing as far as possible.

A number of solutions were found to fulfill the requirements. A major part of them use driving mechanisms composed of various motion transfer elements to drive the lock blade accommodated in the lock casing. Examples of locking devices of this kind are presented in patent publications No. 4. I I 8.480. 4.019.350 and 4.143.292 issued in the German Federal Republic. However, these devices have the disadvantage of the large size of lock casing; in addition, the subassembly that drives the lock blade is complicated.

A further disadvantage is the high probability of operating failures due to the wear and possible blocking of the moving components.

It is also unfavourable that the components driving the lock blade can be accommodated at the costs of thickness of the lock blade which, in turn, significantly reduces the strength and resistance of the lock blade.

Locking devices of smaller thickness are described in the patent publications No. 3.427.713, 3.316.261 and 3.037.018, _. issued in the German Federal Republ^'ic.

Although the depth of the lock casing will be significantly reduced, yet, this version has the disadvantage of an increased complexity of moving mechanisms used.

Again, the wear of moving components and, consequently, the possibility of failures is also unfavourable.

The patent publication No. 3.731.879 issued in the German Federal Republic describes a simpler device. Its essential feature is. that the lock blade is driven by a ring-shaped component that encloses the lock insertion piece. The ring mantle is provided with indents, while the lock blade is connected to a cogged segment. During operation, the driving ring controlled by the handle of insertion piece drives the component provided with the cogged segment by means of the geared connection, thus causing the lock blade to be protruded and retracted, respectively, by means of a pin.

The design has the disadvantage that, as a result of wear, the height of the cogs in contact will be reduced after a short time; thus, by exercising sufficient force, the lock blade can be retreated manuallv into the lock casing. - J -

It is also disadvantageous that, due to the significant wear of the components rubbing against each other, the locking device may fail within relatively short time, which manifests itself in offsetting or blocking during opening and closing respectively.

It is also unfavourable that, due to the cogged segment moving near the lock blade, the thickness of the lock blade shall be reduced. Thus, at the interface of the door and the door-frame, the lock blade is of smaller thickness than desired, thereby reducing the safety against burglar,'.

Most of the known solutions have the common insufficiency that - in spite of their original function - they can be opened by using simple tools and operations, even without any key, due either to the small cross section of the lock blade or the easily removable moving parts.

The present invention aims at eliminating the disadvantages of the traditional locking devices by developing a design that, in spite of the small distances between the front panel and the centre of locking element as well as between the centre of locking element and the rear panel, accommodates a simple mechanism to drive the lock blade.

It was also an objective that the reduced depth shall not involve the increase in the height of the lock casing, while also preserving at least the same protrusion of the lock blade as in the case of traditional devices.

The idea of invention was based on the realization that, by using a driving ring of special design and a special connection zone of design that differs from the known solutions and is adapted to the driving ring, the problem can be solved

According to the objective set. the improved locking device according to this invention -that includes: a casing assembled of a tray, a cover and a front panel provided with a cutoff; a lock blade accommodated inside the casing, suitable to be protruded thereof partially through the opening of the front panel; further more, a locking element e.g. insertion piece that can be encased into the casing; as well as an operating device inserted between the lock blade and the locking element; having the said operating device a driving ring provided with split and skirt to enclose the locking element, and. a transmission subassembly as the case may be; having at least either the lock blade or the transmission subassembly a connection zone while being the driving ring connected either directly through the connection zone or by means of the transmission subassembly to the lock blade so as to enable the motion to be transferred - is designed in a manner that a recess is indented in at least one end of the contact surface adjacent to the split on the skirt that forms part of the driving ring, the connection zone has a single exsection bordered by a primary switching element and a secondary' switching element, and at least the secondary switching element has a connecting part at its connection side facing the driving ring, being the shape of said connecting part adapted to the contact surface on the skirt of the driving rin *og

A further feature of the improved locking device according to the invention may be that the connecting part consists in a hole indented into the connection side of the secondary switching element.

In respect of the embodiment, it is advantageous that the primary switching element of the connection zone is provided with a recess at its boundary surface facing the driving ring.

In another version of the locking device, a guide groove is cut into the contact surface of the skirt of the driving ring, the primary switching element of the connection zone at its boundary surface near the driving ring is provided with a first engaging element that protrudes into the guide groove of the driving ring, and the connecting part of the secondary' switching element at us connection side facing the driving ring provided with a second engaging element, while being the first engaging element and the second engaging element fit in a provi 3 -

sory manner into the guide groove so as to allow them to glide.

In a further different embodiment, the skirt of the driving ring has a rim. The inner side of the guide groove is formed continuously with the mantle covering the rim of the driving ring.

In a further embodiment of the invention, the transmission subassembly is composed of one or more motion transfer elements, at least one of the said motion transfer elements is provided with head and foot as well as neck located between the said head and foot the connection zone is connected to the driving ring formed on the head of the motion transfer element while the foot of the motion transfer elements is in connection with the lock blade body of the lock blade.

The solution according to the invention has a number of advantages. The most important feature is, that the depth of the lock casing can be significantly reduced, while maintaining its usual^'height - in the case of both sunk mount and surface mount locking devices - , thus allowing the operating device to provide a stroke length larger than usual at a single revolution of the locking element. A further advantage is that, due to its new design, the thickness of the lock blade can be increased practically along the full operating length of the. lock blade head to a larger size as compared to the known solutions, thus increasing the safety of the locking device significantly against burglary.

It shall also be considered an advantage that no intermediary subassembly shall be inserted between the lock blade and the driving ring; thus, the structural design of the locking device will be simpler. The small number of moving elements reduces the wear and the tendency to be blocked; this involves the probability of failures reduced and the functional reliability improved. It is also a favourable feature that the locking device according to the invention can be manufactured by using traditional technology and ..with reduced cost expenditures.

In the following, the invention will be described by means of exemplary' embodiments in detail, based on drawings as follows:

Fig. 1 shows the side view of the closing device, in partial sectional view.

Fig. 2 shows the closing device of Fig. 1 in an axonometric projection.

Fig. 3 shows the driving ring represented in Fig. 1 in an axonometric projection.

Fig. 4 shows the side view of another locking device in its open position.

Fig. 5 shows the side view of the locking device of Fig. 4 in its closed position, in partial sectional view.

Fig. 6 shows the driving ring indicated in Fig. 4 in an axonometric projection.

Fig. 7 represents the lock blade indicated in Fig. 4 in an axonometric projection.

Fig. 8 shows the side view of another version of the invention in open position.

Fig. 9 shows the side view of the closing device of Fig. 8 in closed position.

Fig. 10 shows and exemplar, embodiment of the transmission subassembly of the operating device. Fig. 1 shows an exemplary embodiment of the closing device according to the invention, which consists of a traditional sunk mount closing device in the present case. The lock casing 1 consists of the tray la, the cover lc and the front panel 2 located at the lock blade 5 side of lock casing.

The tray la and the cover l c of lock casing 1 are fastened together by means of the fixing elements 8 that connect through the opening Id on the cover lc to the screw bushing 1 b fastened to the tray la.

Fig. 1 also shows the core 3 and the trap head 4a of the trap 4 - that can be operated by the core 3 in a manner known in itself - protruding out of the front panel 2. The part non covered by the cover 1 c shows the placement of the locking element which consists of the insertion piece 7 in this particular case.

Although, for the sake of completeness, the closing device shown in Fig. 1 includes the core 3 and the trap 4, it is not considered a necessary requirement and does not influence the essence of solution.

The insertion piece 7 is enclosed by the driving ring 12 of the operating device 10 which consists of a body of revolution derived from an "L" section, provided with the rim 12a and the skirt 12f. The driving ring 12 is also provided with a split 12e that accommodates the crank 7a of the insertion piece 7.

It is a matter of course that the closing device is suitable to be operated by using cylinder locks not only those in conformity with DIN standard but also of other types; or even, traditional keys can also be used as locking element. Depending on the various locking elements, the sizes of central part, the rim 12a and the outer dimension of the skirt 12f on the driving ring 12 shall be modified, which do not influence the essence of the invention at all.

It is also obvious that the hole to be cut in the tray l a and the cover l c of lock casing 1 shall be in conformity with the key and the cylinder lock, respectively, as the case mav be. Fig. 1 also shows the lock blade body 5b that forms the elongation of the lock blade head 5a of the lock blade 5 and is accommodated inside the lock casing 1. Here, it is well shown that the lock blade body 5b is connected by means of the connection zone 6 directly to the driving ring 12 of the operating device 10.

The connection zone 6 is provided with the primary switching element 6a located nearer to the lock blade head 5a of lock blade 5 and with the secondary switching element 6b located farther from the lock blade head 5a of lock blade 5. furthermore, with the exsection 6c located between the primary sw itching element 6a and the secondary switching element 6b.

It shall be stressed here that the connection zone 6 of the closing device according to the invention is provided only with this single exsection 6c. as opposed to other known solutions that, in any case, necessitate at least two indents ser ing for identical purpose.

Another feature worth of mentioning is that, in this particular embodiment, the operating device 10 includes only a single element, namely the driving ring 12. Fig. 2 shows the lock blade 5 used in the embodiment of Fig. 1. It is well shown that the lock blade body 5b of lock blade 5 has a simple connection zone 6. The boundary surface 61a of the primary switching element 6a includes the recess 61 1 a while the connecting part 62b on the connection side 61 b of the primarv switching element 6a is provided with the hollow 621b.

Both the recess 61 1 a and the hollow 621 b are of curved shape adapted to the contact surface 12g of skirt 12f on the driving ring 12 connected to the lock blade 5 as shown in Fig. 3.

It is well shown in F^,-g. 3 that, with the connection zone 6 designed according to Fig. 2. the skirt 12f of the driving ring 12 that surrounds the rim 12a is of smooth surface; only the part of contact surface 12g adjacent to the split 12e is provided with the sockets 12c. that are designed to enable the connection zone 6 of lock blade 5 and the driving ring 12 of operating device .10 to move freely.

During the operation of the closing device described above, the rotation of the crank 7a of insertion piece 7 counterclockwise - related to the position indicated in Fig. 1 - causes the driving ring 12 to rotate; the contact surface 12g of said driving ring 12 slides freely in the recess 61 l a on the boundary' surface 61a of the primary switching element 6a located in the connection zone 6 of the lock blade 5. During this period, the lock blade 5 remains at a standstill.

As soon as the crank 7a of insertion piece 7 reaches the exsection 6c in the connection zone 6 of lock blade 5. it engages into the primary' switching element 6a that borders the exsection 6c on the left side and pushes the lock blade 5 so as to partly protrude it out of the lock casing 1. During its movement, the crank 7a slides along the side of primary switching element 6a. then, it will be disengaged on reaching the rim.

Just at this moment, the contact surface 12g of skirt 12f on the driving ring 12 reaches the hollow 621 b recessed in the connecting part 62b on the connection side 61b of secondary switching element 6b that is located behind the exsection 6c and. in turn, pushes it outwards until the two rounded surfaces become in contact.

As soon as the contact surface 12g of the skirt 12f on the driving ring 12 engages with the hollow 621 b of the secondary switching element 6b. the lock blade 5 fails to continue its outward motion; instead, it will be stopped and remains at a standstill. The end position is also stabilized by the contact surface 12g and the hollow 621 b pressed against each other and. because the - in this particular case - rounded section of the hollow 621 b remains below the upper point of the skirt 12f on driving ring 12. the lock blade 5 is prevented from being retracted. When opening the locking device, the process described above will take place in a reverse order. On reaching the exsection 6c on the connection zone 6 of lock blade 5, the crank 7a rotating clockwise pushes against the side of the secondary switching element 6b and. during its further rotation, retracts the lock blade 5 into the lock casing 1. When the crank 7a disengages from the exsection 6c, the skirt 12f of driving ring 12 engages into the recess 61 1 a formed in the boundary surface 61 a of the primarv' switching element 6a and pushes it back completely to its open position.

In the version represented in Fig 1. the fixing of lock blade 5 in its base position is ensured by the contact surface 12g being in its rest position in the recess 61 1 a. In the case, however, that the said two surfaces are not conform, that is. they fail to fit together, the lock blade 5 can be retained in its base position by using other solution not represented in the figures, e.g. by means of an arresting mechanism.

Fig. 4 shows the area surrounding the insertion piece 7 of a locking device of small depth different from those described above, with the lock blade 5 in its open position. In Fig. 5. the same locking device is indicated in closed position. It is shown that, in the present embodiment the depth of the lock blade 5 is practically equal to the depth of the lock casing 1. Otherwise, in Fig. 4 and Fig. 5. it can also be noticed that the switching zones of the driving ring 12 and the lock blade 5 are different from those used in the version already described.

Fig. 6 shows the driving ring 12. Again, it is provided with rim 12a and skirt 12f as well as the split 12e. As opposed to the previous design, however, the contact surface 12g of the skirt 12f holds the guide groove 12d which establishes the outer rim 12b at the outer side of skirt 12f. This driving ring 12 is also provided with the sockets 12c that are located at both sides of the split 12e. These sockets 12c prevent both the rim 12a and the outer rim 12b from reaching the split 12e. The free surface thus established allows the appropriate elements of the connection zone 6 to run easily into and out of the path formed by the guide groove 12d.

In the case of the driving ring 12 represented in Fig 6. the inner side 121 d of the guide groove 12d forms a continuous surface with the cover mantle 121 a of the rim 12a. This is not considered a requirement: nevertheless, it is advantageous in respect of the manufacture.

It shall be noted here that it is not necessary to shape the sockets 12c symmetrically on both side of the split 12e; however, it is inevitable that a socket 12c will be provided near the secondary switching element 6b on the connection zone 6 of driving ring 12

It shall also be mentioned that the dimensions of sockets 12c depend on the dimensions of primary switching element 6a and secondary switching element 6b of the connection zone 6. In the case that the primary switching element 6a and the secondary' switching element 6b are of the same size, the sockets 12c will also be identical; otherwise it is not necessary that the sockets 12c will be located symmetrically.

Fig. 7 shows a lock blade 5. the connection zone 6 of which is designed so as to enable it to be reliably connected to the driving ring 12 of Fi *σg.- 6.

The primary switching element 6a and the secondary switching element 6b bordering the exsection 6c formed on the connection zone 6 of the lock blade body 5b of lock blade 5 consist in foots, at which the first engaging element 612a is projected out of the boundary surface 61 a of the priman. sw itching element 6a on the side of driving nng 12, and the second engaging element 622b is projected out of the connecting part 62b on the connection side 61 b of secondarv switching element 6b facing the driving ring 12. The shape of the first engaging element 612a and the second engaging element 622b is adapted to the guide" groove 12d in the driving ring 12 of Fig. 6.

The operation of the locking device described in connection to the figures 4 to 7 is essentially the same as in the case of solutions shown in figures 1 to 3. The difference is that, during the protrusion and retreat of the lock blade 5. it is either the first engaging element 612a or the second engaging element 622b of the secondary' switching element 6b instead of the contact surface 12g of the driving ring 12 that drives the lock blade 5.

In the open position of the lock blade 5, the first engaging element 612a projecting from the primary switching element 6a of the connection zone 6 on the lock blade 5 towards the guide groove 12d of the driving ring 12. engages with the guide groove 12d and, as it is located within the curved section below the uppermost deadpoint of the guide groove 12d. it is ensured that the lock blade 5 is disabled to be displaced and protruded out of the lock casing 1

When closing, the crank 7a of the insertion piece 7 rotating counterclockwise causes the driving ring 12 to rotate, which, in turn, moving together w ith the crank 7a. reaches a position that the first engaging element 612a fastened so far contacts the part neighbouring the socket 12c of the guide groove 12d in the driving ring 12. being thus released from the guide groove 12d.

When the first engaging element 612a will be released, the crank 7a reaches the exsection 6c and. while engaging with it will be pressed against the wail of the primary switching element 6a, thus pushing the said primarv- switching element 6a until the 7a is disen ^•sga-ged from the exsection 6c.

Prior to this, however, the second engaging element 622b projecting from the secondary switching element 6b of the connection zone 6 on the lock blade 5 towards the guide groove 12d of the driving ring 12 reaches the socket 12c formed behind the crank 7a in the contact surface 12 ofthe driving ring 12 - j -

and, passing through, engages with the ring-shaped path of the guide groove 12d. That part of the guide 'groove 12d in the driving ring 12 moving together with the crank 7a, that is located behind the crank 7a, engages with the second engaging element 622b and. due to the gearing, forwards it until the outer end position of the lock blade 5.

When the lock blade 5 reaches its closed position, the second engaging element 622b gets in its rest position within the section of the guide groove 12d- that it cannot be displaced from, even under the effect of an external force.

When opening the lock blade 5, the process described above will take place in the reverse order; therefore, its presentation is considered unnecessary.

Fig. 8 and fig. 9 show an exemplary embodiment of the invention, in which the operating device 10 is also provided with the transmission subassembly 1 1 , in addition to the driving ring 12.

It is a matter of course that the transmission subassembly 1 1 may^' have motion transfer elements 1 1 1 of various design, in different number and guided along various paths, which, however, do not influence the essence of the function of locking device. Consequently, for the sake of simplicity, a transmission subassembly 1 1 consisting only of a_. single motion transfer elements 1 1 1 was represented in this example.

Fig. 10 shows the motion transfer elements 1 1 1, which has a head 1 1 l c. a foot 1 1 I d and a neck 1 1 1 b connecting the latters together. The pin I l ia which fits into the slot 5c in the lock blade body 5b of the lock blade 5 is projected over the foot 1 1 I d. while the head 1 1 1 c holds the bore 1 1 1 e and the connection zone 6..

It is the bore 1 1 1 e that is used to mount the motion transfer elements 1 1 1 on the axle pin l e fastened to the tray l a of the lock casing 1. thus allowing the motion transfer elements 1 1 1 to rotate. Here again, the connection zone 6 includes the primary switching element 6a. the secondary switching element 6b as well as the exsection 6c; being said primary switching element 6a provided with the first engaging element 612a and the said secondary switching element 6b with the second engaging element 622b.

By means of the connection zone 6, the motion transfer elements 1 1 1 thus designed engages with the driving ring 12 of the operating device 10 in the same manner as described in the previous example. The opening and closing of the lock blade 5 is also the same, except that the lock blade 5 will be protruded . out of and retracted into the lock casing 1 under the effect of the transmission subassembly 1 1.

In this case, the movement of the lock blade 5 is implemented as follows: by rotating the driving ring 12, the head 11 1c of the motion transfer elements 1 1 1 connected to the said driving ring 12 by means of the connection zone 6 will rotate around the axle pin le, also causing the motion of the foot .1 1 I d. Due to the motion of the foot 1 1 Id. the pin I l ia mounted at the end of the foot 1 1 Id will also move along an arc. thus, depending on the direction of its motion, pulling or pushing the lock blade 5.

In the figures presented, not all the driving rings 12 are provided with rim 12a. this is only an advantageous version to the embodiment. Of course, it is also possible that the driving ring 12 has no rim 12a. or even, there may exist versions in which a rib protrudes from the skirt 12f of the driving ring 12 and the nest connected to the rib is formed in the lock blade 5. Our claims also cover such kind of versions, as their essential elements are in conformity with the idea of the invention.

The locking device of improved features according to the invention is well suitable to be used in areas where the safe closing of openings is required. either within the usual range of dimensions or within a more restricted range, especially in the case of portal locks.

List of references

lock casing l a tray l b screw bushing l c cover

Id opening l e axle pin front panel 2a cutoff core trap 4a trap head lock blade 5a lock blade head

5b lock blade body

5c slot connection zone 6a primary switching element

61 a boundary surface

61 1 a recess

612a first engaging element

6b secondary switching element

61 b connection side

62b connecting part

621 b hollow

622b second engaging element

6c exsection insertion piece 7a ^' crank fixing element operating device transmission subassemblv 1 1 motion transfer elements 1 1 a pin 1 1 b neck

I l c head l i d foot

I I e bore driving ring 12a rim

121a cover mantle 12b outer rim 12c socket 12d guide groove

12 Id inner side 12e split 12f skirt 12g contact surface

Claims

1. Locking device of improved features, that includes: a casing assembled of a tray, a cover and a front panel provided with a cutoff; a lock blade accommodated inside the casing, suitable to be protruded thereof partially through the cutoff of the front panel; furthermore, a locking element e.g. insertion piece that can be encased into the casing; as well as an operating device inserted between the lock blade and the locking element; having the said operating device a driving ring provided with split and skirt to enclose the locking element, and a transmission subassembly as the case may be; having at least either the lock blade or the transmission subassembly a connection zone while being the driving ring connected either directly through the connection zone or by means of the transmission subassembly to the lock blade in a manner to enable the motion to be transferred, characterized i n that a socket (12c) is indented into at least one end of the contact surface (12g) neighbouring the split (12e) of the skin ( 12f) that forms part of the driving ring (12). the connection zone (6) has a single exsection (6c) bordered by a primary switching element (6a) and a secondary switching element (6b), and at least the secondary switching element (6b) has a connecting part (62b) in its connection side (61b) near the driving ring (12). being the shape of said connecting part (62b) adapted to the contact surface (12g) of the skirt (12f) on the driving ring (12).

2. The locking device of improved features as in claim 1. characterized in t h a t the connecting part (62b) consists in a hollow (621b) indented into the connection side (61b) of the secondary switching element (6b).

3. The locking device of improved features as in claim 2. characterized i n that the

switching element (6a) of the connection zone (6) is provided with a recess (61 la) at its boundary surface (61 a) facing the driving ring ( 12).

4. The locking device of improved features as in claim 1. characterized i n that a guide groove (12d) is cut into the contact surface (12g) of the skirt (12f) on the driving ring (12). being the primary switching element (6a) of the connection zone (6) at its boundary surface (61a) near the driving ring (12) provided with a first engaging element (612a) that protrudes into the guide groove (12d) of the driving ring (12) and the connecting part (62b) of the secondary' switching element (6b) at its connection side (61b) near the driving ring (12) provided with a second engaging element (622b), while being the first engaging element (612a) and the second engaging element (622b) fit in a provisory manner into the guide groove (12d) so as to allow them to glide.

5. The locking device of improved features as in any of the claim 1 to 4. characterized in that the skirt (12f) of .the driving ring (12) has a rim (12a).

6. The locking device of improved features as in claim 5. characterized in that the inner side ( 1-2 Id) of the guide groove (12d) is formed as a continuation of the cover mantle (121a) bordering the rim (12a) of the driving ring (12).

7. The locking device of improved features as in any of the claims 1 to 6. ch aracterized in that the transmission subassembl \ ( 11 ) is composed of one or more motion transfer elements (111), being at least one of the motion transfer elements (111) provided with head (111c) and foot ( 11 Id) as' well as neck (111b) located between the said head and foot, the connection zone (6) is connected to the driving ring ( 12) formed on the head (111c) of the motion transfer element (111) while the foot (11 Id) of the motion transfer element (111) is in connection with the lock blade body (5b) of the lock blade (5).