Technical Field of the Invention The present invention relates to a blockage mechanism wherein a bolt inside the lock are blocked with more than one plate having matching fins in order to provide a high- safety locking mechanism.

Background of the Invention

In the prior art, current locks having a cylinder, plate lock, lever lock or different kinds of locking mechanisms can be opened/closed by a specific key preferably provided by generating a mechanical effect with the activation of the lock mechanism when a suitable key is rotated by the user.

One of the problems experienced with the available locks having a plate mechanism is that the bolts in the locks that are used for the safety of residential places or the like are exposed to a pressure by means of a picklock or a similar tool, and then they are removed and the lock loses its function.

Moreover, when the locks comprising a conventional type of cylinder are intended to be open by an authorized people, the bolts can be provided to retract into the lock. In the plate tumbler locks, on the other hand, the bolts can be released by removing the superimposed plates in an adequate amount.

In the prior art, different type of lock mechanisms have been developed to prevent the bolts to be retracted. In one of those, document DE3111247, and which is currently public; a locking mechanism comprising a cylinder, a plate, a locking catch, a trigger plate and at least one bolt, and carrying a protecting plate is disclosed. In the said document, a lock is defined which is high-safety against the drilling of the lock. An European patent document EP0651116A1, on the other hand, a locking mechanism is disclosed comprising within its case, a locking system which can change its place by means of a lock operating element, and a plate having at least one locking position extending towards the edge of the door and an opening position when it is retracted towards the said edge. The locking mechanisms mentioned in the said documents do not only have a complex structure, but they also require labor. Moreover in the commercially-available lever locks, there is no plate group providing an extra blocking preventing the bolts from being retracted by means of a picklock or the like after it has been brought to the locked position.

It is aimed to eliminate the above-mentioned problems by means of a lock comprising a plate attached with the bolt group which matches with an opposite plate upon an undesired external attack, and a blockage mechanism blocking the movement of the bolts.

Objects of the Invention The main object of the present invention is to provide a lock mechanism which blocks the bolts to prevent the lock from being opened by an external force, wherein no expensive and complex parts are used inside the lock which increases the cost.

Another object of the present invention is to provide a high-safety lock which makes it difficult to retract the bolts into the lock housing by blocking the movement of the bolts and the bolt tail when it is forced externally by means of a picklock or a similar tool.

A further object of the present invention is to provide security equipment which can be applied to different locking mechanisms.

Summary of the Invention

The present invention relates to a plate tumbler lock which comprises at least one bolt , a bolt tail extending from said at least one bolt and a plurality of tumbler plates for selectively moving the bolt, during use, in +X direction or retracting the same in - X direction in a lock body. Said plate tumbler lock further comprises; a driving plates which is attached to the bolt and which comprises at least one fin in the form of a protrusion. Moreover, a locking plate comprises at least one fin sized and dimensioned to match with a corresponding fin of the driving plate when, in use, said locking plate is forced to move beyond its working range in +Y direction such that linear movement (+X, -X) of said bolt is prevented.

Brief Description of the Figures

The enclosed figures are shown only for a better understanding of the lock blocking mechanism according to the present invention, and they do not pose an effect limiting the scope of the invention. Figure la is a front view of the locking plate according to the present invention.

Figure lb is a side view of the locking plate according to the present invention.

Figure lc is an upper view of the locking plate according to the present invention.

Figure Id is a perspective view of the locking plate according to the present invention.

Figure 2a is a front view of the sliding-bar plate according to the present invention. Figure 2b is a side view of the sliding-bar plate according to the present invention.

Figure 2c is an upper view of the sliding-bar plate according to the present invention.

Figure 2d is a perspective view of the sliding-bar plate according to the present invention.

Figure 3 is a front view of the blocking mechanism according to the present invention when the bolts are not pushed and the cover of the lock is removed in a way to show the locking mechanism.

Figure 4 is a front view of the blockage mechanism according to the present invention when the bolts are pushed and the cover of the lock is removed in a way to show the locking mechanism. Figure 5 is a partial front view of the blockage mechanism according to the present invention inside the lock.

Detailed Description of the Invention

In the light of the figures provided above with their brief descriptions, the present invention is described in detail in the following. The list of the part numbers used in the figures is as follows;

11 Locking plate

12 Locking plate slot

13 Fin of the locking plate

14 Hole

15 Lock

16 Driving plate

17 Driving plate pin

18 Bolt

19 Bolt tail

20 Fin of the driving plate

21 Pin

22 Driving plate hole

23 Key

24 Channel It is aimed to eliminate the said problems experienced in the state of the art which is described above briefly by means of the blockage mechanism offered within the framework of the present development.

The present invention, mainly relates to a blockage mechanism comprising two plates (11, 16) having fins (13, 20) in the form of protrusion on their lateral surfaces, wherein the said fins (13,20) are matched with each other when they arrive on the same lateral axis and provide locking.

The plate tumbler lock defined in the figures shown within the present invention is based on the principle that the plates are located in a way to allow the movement of the bolts in accordance with the code or encryption on the key (23); the bolt (18) is moved with the help of the mechanical effect applied with the key (23); and therefore the locking and unlocking processes are performed. In figure 3, the said blockage mechanism attached on a plate tumbler lock is located between the lock inner parts and the lock side body cover. A driving plate (16) located on the bolt group comprising a bolt (18) and the bolt tail (19) is located in a way to move in the linear direction (+X,-X) in a synchronized manner with again the said bolt group. The said driving plate (16) moves synchronously with the bolt (18), and upon a possible intervention it matches with the locking plate (11) and locks the system. As it can be seen in Figure 2d, there is at least one pin (17) on the said driving plate (16). The said driving plate pin (17) is guided inside a channel (24) formed on the lever lock plates. The plate tumbler lock comprises a plurality of plates movably mounted and shiftable by rotation of the key in the lock to a position enabling movement of the bolt member in a working range (h) which can be seen in fig. la. Said plate tumbler (15) lock can be opened/closed by a specific key preferably provided with suitable tailpieces or blades which are indented and define the code or encryption of the key itself. When said locking plate (11) is forced to move beyond its working range (h) in +Y direction, at least one fin (13) of the locking plate (11) matches with the at least one corresponding fin (20) of the driving plate (16) such that linear movement (+X, -X) of said bolt is prevented. An unauthorized person may simulate the presence of the key in the lock. If an unauthorized person attempts to move plates within the body by using a tool such as picklock or skeleton key, said locking plate (11) possible exceeds beyond the working range so that at least one fin (13) of the locking plate (11) engages, as seen in fig. 5, with at least one corresponding fin (20) of the driving plate (16) in order to prevent axial movement of the bolt. Moreover, said fins are sized and dimensioned to match with each other.

The locking plate (11) shown in figure la-Id in various ways, is located on the pins between the bolt tail and the side body cover inside the lock. When said locking plate (11) arrives on the same horizontal plane with the fins (20) on a driving plate (16), the said locking plate (11) comprises fins which will match with the said fins of the driving plate (20). In Figure 4, the locking plate (11) and the driving plate (16) composing the blockage mechanism according to the present invention are shown when the bolts (18) are moved. In the said position where the said bolt (18) is moved, the said locking plate (11) partially closes the part in which the key (23) is inserted, and hides the mechanism under that, which makes it difficult to open that mechanism by means of a skeleton key or the like.

By means of the gap between the locking plate (11) and the driving plate (16), which can be seen in figure 3 and 4, it is prevented to cause any kind of a problem while the bolt works normally. In the case that the said bolt (18) is moved linearly in +X direction by the means of the key (23), said fins (13, 20) cannot match because of the height level difference and the gap between on the fin of the locking plate (13) and fins of the driving plate (20), and the blocking cannot be provided.

The bolt tail (19) of the bolt (18) extends towards the inner part of the lock body to be connected to the locking mechanism by means of the protrusion, pin or other similar elements that are located on it. In the locking mechanism shown in figure 3, a locking plate slot (12) on the locking plate (11) and at least one pin (21) inside the lock are guided in a way to move inside the said locking plate slot (12). By guiding the said pins (21), it is provided to move the said locking plate in +Y and -Y direction.

Likewise, the driving plate pin (17) located on the driving plate (16) shown in Figure 2a-2d is connected in a way that it can move inside the said channel (24). Moreover, in order to decrease the damages that may be created because of a possible friction and to provide a more stable connection with the plate and the surrounding locking mechanism elements, there is located at least one driving plate hole (22) on the said driving plate (16) so as to rise up the said plate (16). Likewise, the said locking mechanism (11) also comprises at least one hole (14) in a way to allow riveting on it.

In the plate tumbler lock shown in the figures, each of plates that are horizontally superimposed and carries a code or encryption which are match with the key. In the case that the plate group is risen up to a desired height by an unauthorized person, the bolts can be retracted. In the case that the said locking plate (11) is risen up to a height higher than the level that it is needed to rise with the key (23), the fin of the driving plate (20), which are connected to the bolt group by means of a hinge, matches with the fins of the locking plate (13).

The fins in the form of protrusion which will be interpenetrated as a result of this contact provide the bolt tail (19) moving synchronously with the bolt to be hold, and therefore the said bolt (18) are prevented from retracting themselves. Therefore, the plate tumbler lock plates are prevented from being opened with an external intervention.