EA027077B1 - Break-in resistant lock - Google Patents

Abstract

Provided is a break-in resistant lock comprising at least one spring-latch and at least one bolt, a box-like containment body (2) provided with openings (3) along one of perimetric faces of the body (2) for passage of said latch and bolt, a tang with a hinge fixed on it intended for actuating the bolt and movable linearly to the uncoupling position by means of rotation of at least one key relative to said hinge, a lever system (4) controlled from outside by means of a tool (5) for changing the lock combination through a slit (6) in the body (2), a plurality of code plates, each constituted by a main lamina and a complementary lamina detachably connected to each other by means of said lever system (4), wherein the lever system (4) comprises an axis (9), a contoured arm (8) with an end stem (14) and a tab (13) shifted relative to the axis (9), the contoured arm being rotatable about the axis (9), and a rod (7) adapted to move from the first inactive position where one of the edges (10) of the rod (7) is substantially aligned with and proximate to a portion (11) of the arm (8) that has a form of a projecting nose directed to said edge (10) of the rod (7) end, to the second unlocking position where the end (12) of the rod (7), after axial pressing on the rod (7) by the tool (5), rests on the tab (13) of the arm (8), and in said second position of the rod (7) the lever (8) is turned by a preset angle and engaged, by means of its end stem (14), with complementary laminas for uncoupling of complementary laminas from respective main laminas, characterized in that said rod (7) in its first inactive position is able to prevent rotation of the contoured arm (8).

Description

FIELD OF THE INVENTION

The invention relates to a tamper-resistant lock adapted to prevent any attempt at force, in particular to a lock of the type suitable for controlling a double-beard key.

Prior art

Locks interacting with double-bit keys consist of a main box-shaped case, which is provided with a (essentially transverse) socket adapted for key insertion.

The key, after being entered, is positioned so as to align its code-bearing portion with a plurality of code-forming plates (commonly known as toggle switches) that can perform partial translational motion along predetermined directions.

The rotation of the key in the socket entails the movement of the plates (toggle switches), corresponding to the detachment of the rod (which is usually connected by engagement with the plates): such a rod, thus, can be moved in translational motion by turning the key in the socket.

The bolts are firmly connected to the front portion of the rod: the translational movement of the rod entails the release of the bolts from the front edge of the lock, followed by their stable engagement in the slots of the door jamb to ensure proper closing of the door into which the lock is installed.

This type of lock guarantees a good level of protection against attempts to break into a destructive type, since the large size makes it possible to provide options for the implementation of the armored type.

More specifically, specific types of locks are known that provide the ability to change the code combination that corresponds to the key required to open.

If the keys are lost or if you need to give them temporarily to people of unacknowledged reliability, you can change the code combination of the lock to associate it with a new key.

Changing a key can be done simply, without removing the lock or parts thereof, and an unlimited number of times.

The double-bit key controls the respective plates forming the code combination, each of which consists of a thin plate and a corresponding additional thin plate, which are firmly connected to each other: turning the key causes the bolts connected to the plates to exit or retract.

When changing the code combination by using a suitable tool in the internal linkage system, it is possible to apply force to the additional thin plates to detach them from the corresponding thin plates. The subsequent connection of each thin plate with the corresponding additional thin plate can be performed by accepting, as an element determining their relative position, a new key with a different code combination: thus, the lock accepts the code combination of such a key.

Such recoded locks are known, for example, from EP 0 943 761 A1 and ΌΕ 202007016675 I1.

However, through hacking, you can access the internal lever system, although it is difficult and difficult to work with special power tools, through the key access slot to move it to a position that disconnects the thin plates from the corresponding additional thin plates: in this position, simply move the lock into the open configuration, because you can select any key to recode the lock.

This hacking opportunity is a serious problem for this type of lock.

Disclosure of invention

The purpose of the invention is to eliminate the aforementioned drawbacks by providing a tamper-resistant lock in which it is not possible to control the lever systems by gaining access from the keyhole with power tools.

The purpose of the present invention is to provide a tamper-resistant lock that has a low cost, is relatively easy to implement and safe to use.

This target and this object, as well as other goals and objects that will become better visible below, are achieved by a burglar resistant lock containing at least one spring latch and at least one deadbolt, a box-shaped protective case with holes for passing the specified latch and deadbolt located along one of the perimeter faces of the housing, a leash with a hinge fixed on it, designed to actuate the bolt, made with the possibility of translational movement to the disconnection position by turning at least one key relative to the specified hinge, a lever system with external control by means of a tool for changing the combination of the lock through the slot in the housing, a plurality of code plates, each of which consists of the main and additional plates connected to one another with the possibility of separation by means of the specified lever system, while the lever system contains an axis, a shaped lever with a shank and offset relative to the axis of the protrusion, made with the possibility of rotation relative axially, and a rod installed with the possibility of translational movement from the first inoperative position, in which one of the edges of the rod is aligned and

- 1 027077 is close to the part of the lever, formed in the form of a protruding nose, which is directed to the said edge of the end of the rod, in the second unlocking position, in which the end of the rod when pressing the rod in the axial direction of the tool rests on the ledge of the lever, and in the said second position of the rod the lever is rotated by a predetermined angle and is engaged by means of its shank with additional plates to disconnect additional plates from the corresponding main plates, and the specified rod in its specified first In idle position it is able to prevent the turn of the shaped lever.

Brief Description of the Drawings

Further features and advantages of the invention will become better apparent from the following detailed description of a preferred, but not exclusive embodiment of a tamper-resistant lock according to the invention, shown by way of non-limiting example in the accompanying drawings, in which FIG. 1 is a perspective sectional view of a portion of a lock resistant to breaking in accordance with the invention;

FIG. 2 is a sectional perspective view of a portion of the lock-resistant lock of FIG. 1 during preparation for changing the code combination;

FIG. 3 is a side cross-sectional view of a part of a lever system for actuating the installation of a new code combination of a tamper-resistant lock in accordance with the invention in an inoperative configuration, while a tamper attempt occurs, consisting in raising the shaped lever;

FIG. 4 is a side cross-sectional view of a part of a linkage system for actuating the installation of a new code combination of a tamper-resistant lock in accordance with the invention in a working configuration.

Embodiments of the invention

Turning to the drawings, we note that the reference numeral 1, in general, denotes a lock resistant to breaking.

The lock 1 contains a box-shaped protective case 2, which is provided with holes 3 at least along one of its perimeter faces. As a first approximation, it can be noted that the box-shaped body 2 has a shape similar to a flattened across the parallelepiped: two large front surfaces are mutually opposite and mutually connected by a perimeter face.

On such a perimeter face, holes 3 are provided which are designed to extend at least one spring latch and at least one deadbolt; the deadbolt is actuated by means of a corresponding translationally moving leash (commonly referred to as a member of the rod and / or deadbolt movement).

The translationally moving leash, in turn, is driven translationally by turning the at least one key; in particular, the turns of the at least one key depend on the movement in the disconnection configuration with respect to a suitable fixed hinge (also known as a rectangular hinge, due to its cross section, which is usually rectangular) on a translationally moving leash, a plurality of code-coded plates.

The key combination plates are provided with a section that prevents the key from moving during rotation: such an interfering section is shaped so that when the key is placed perpendicular to the keyhole for insertion into lock 1, the plates raised by the key (since the interfering sections abut against the corresponding areas of the code key combinations) are aligned accordingly to enable the hinge to translate along a convenient path identified by the slots these plates.

Each code-setting plate consists of a thin plate and an additional thin plate, which are mutually connected and can be disconnected by means of a lever system 4, which is driven by the tool 5 from the outside through the corresponding slot 6 provided on the perimeter face of the box-shaped case 2.

The lever system 4 in accordance with a preferred embodiment consists of two functionally related elements; it actually contains a translationally moving rod 7 and a shaped lever 8, which can be rotated relative to the axis of rotation 9.

The rod 7, in order to ensure the correct operation of the lock 1 in accordance with the principles of ensuring the installation of a new combination of its plates, can be moved from the first inoperative configuration, in which one of its edges 10 is essentially aligned and close to the section 11 of the lever 8, preventing its rotation in the second unlocking configuration, in which, by means of a tool 5 (which, in turn, is inserted into the slot 6 to apply axial compression of the shaft 7), one end 12 of the shaft 7 abuts against the protrusion 13 of the lever 8. The protrusion 13 is essentially an off-center nnym about axis 9; in this second configuration, the lever 8 is rotated by a predetermined angle and engages, by means of its end shank 14, with additional thin plates for disconnecting them from the corresponding thin plates (disconnecting makes it possible

- 2 027077 to change the relative position of the thin plates and additional thin plates with the subsequent new combination code lock 1, i.e. the ability to open, using the key, another code combination used before disconnection).

In the housing 2, between the lever 8 and the hole 15, which is generally known as the keyhole for introducing the key, a shaped block 16 is inserted to block at least partially the passage in the housing 2 between the hole 15 and the lever 8.

The presence of the shaped block 16 prevents any tampering performed when the power tools were inserted into the hole 15 to grab the lever 8 and move it until the thin plates are disconnected from the corresponding additional thin plates.

In accordance with a particular preferred embodiment, the rod 7 has a recess 17 adjacent to its end 12, which is adjacent to the edge 10.

The recess 17 may consist of a virtually hollow socket or a simple recess obtained by machining by removing material from the rod 7.

In particular, the accompanying drawings show a recess 17, which has an essentially annular contour, the maximum depth of which is substantially less than half the thickness of the rod 7.

With specific reference to the embodiment shown in the drawings, although it does not constitute a limitation on the application of the present invention, the portion 11 of the lever 8 may consist of a protruding spout, which is directed in an assembled configuration to the edge 10 of the end of the shaft 7.

In this case, the protruding spout, when the lock 1 is in the first configuration described earlier, is placed so that it abuts against the edge 10, thereby blocking the rotation of the lever 8, simultaneously connected to it.

When the lock 1 is in the second configuration, the protruding spout faces the recess 17 as a result of the translational movement of the rod 7 to the protrusion 13 of the lever 8.

Here, further progressive movement of the rod 7 causes the rotation of the lever 8, which is ensured as a result of the free movement of the protruding nose to the base of the recess 17.

When analyzing the lever 8 specifically, we note that such a lever preferably has a pivoting socket of an axis 9, such a socket is made on a leash 18, which is offset along the axis relative to the central portion 19 of the lever 8.

The central portion 19 has a protrusion 13 in its area for connection with a leash 18.

In turn, the central portion 19 has an end wing 20 on the shank 14, which, when the lock 1 is in the first previously described configuration, rests its lower surface on the support block 21 and, when the lock 1 is in the second configuration, abuts against its upper surface in thrust pin 22.

The support block 21 and the stop pin 22 are simultaneously connected to the housing 2 and constitute the lower limit and the upper limit of rotation of the lever 8.

It is worth noting that in order to avoid damage to the lock 1 by using tools that are easy to obtain, such as screwdrivers or screwdrivers, slot 6 and tool 5 have additional and conjugate profiles, so only tool 5 with a suitable profile can be inserted into slot 6 and therefore, only a specific tool 5 can be used to start changing the combination of lock 1.

Preferably, the tamper-resistant lock 1 in accordance with the invention does not allow the lever systems 4 to be activated by gaining access from a window or keyhole 15 with power tools.

The tamper-resistant lock 1 in accordance with the invention has a low cost, is relatively simple to provide in practice and safe to use.

In the shown exemplary embodiments, the implementation of individual characteristics, data regarding specific examples, can actually be replaced by other various characteristics that are present in other exemplary embodiments.

In addition, it should be noted that anything found that will already be known during the patenting process, as should be understood, is not claimed and is subject to a waiver of rights.

In practice, the materials used, as well as the sizes, can be any in accordance with the requirements and state of the art.

Where the technical features mentioned in any claim are accompanied by reference numerals, these reference numerals have been included for the sole purpose of increasing the clarity of the claims, and accordingly, such reference numerals have no limiting effect on the interpretation of each element identified by way of example with such reference positions.

Claims (7)

CLAIM 1. A burglar-resistant lock containing at least one spring latch and at least one deadbolt, a box-shaped protective case (2) with holes (3) for passing the specified latches and deadbolt, located along one of the perimeter front surfaces body (2), a leash with a hinge fixed on it, designed to actuate the bolt, made with the possibility of translational movement to the disconnection position by turning at least one key relative to the specified hinge , a lever system (4) with external control by means of a tool (5) for changing a combination of a lock through a slot (6) in a housing (2), a plurality of code plates, each of which consists of a main and an additional plate connected to one another with the possibility of separation by means of said lever system (4), wherein the lever system (4) comprises an axis (9), a shaped lever (8) with a shank (14) and a protrusion (13) displaced relative to the axis (9), rotatable relative to the axis ( 9), and the rod (7), installed with the possibility repulsive movement from the first inactive position, in which one of the edges (10) of the rod (7) is aligned and is close to the part (11) of the lever (8), formed in the form of a protruding nose, which is directed to the said edge (10) of the end of the rod (7) ), in the second unlocking position, in which the end (12) of the rod (7) when pressing the rod (7) in the axial direction of the tool (5) abuts against the protrusion (13) of the lever (8), and in the said second position of the rod (7) ) the lever (8) is rotated by a predetermined angle and is engaged by means of its shank (14) with additional plates s for detaching the plates from the respective additional core plates, characterized in that said rod (7) in its said first rest position is able to prevent the rotation of the shaped lever (8). 2. The lock according to claim 1, characterized in that inside the housing (2), between the lever (8) and the key hole (15), a shaped block (16) is mounted, at least to partially block the passage inside the housing ( 2) between the hole (15) and the lever (8). 3. The lock according to claim 1, characterized in that the rod (7) has at its end (12) a recess (17) located next to the edge (10) of the rod (7). 4. The lock according to claim 3, characterized in that the protruding nose in said first position of the rod (7) is placed so that it abuts against the edge (10) of the rod (7), blocking the rotation of the lever (8), and in the said second position the rod (7) faces the recess (17) as a result of the translational movement of the rod (7) to the protrusion (13) on the lever (8) so that further translational movement of the rod (7) causes the lever (8) to rotate as a result of the free movement of the protruding nose to the base of the recess (17). 5. The lock according to claim 1, characterized in that the lever (8) has an axis on the axis (9), which is offset along the axis relative to the central part (19) of the lever (8), and the protrusion (13) is made on the said central part (nineteen). 6. The lock according to any one of the preceding paragraphs, characterized in that it has a support block (21) connected to the housing (2) and a stop pin (22), while the central part (19) of the lever (8) is formed by an end wing (20) a shank (14), which in the said first position of the shaft (7) rests with its lower surface on the support block (21) and in the said second position of the shaft (7) abuts its upper surface against the thrust pin (22). 7. The lock according to any one of the preceding paragraphs, characterized in that the slot (6) has a complementary profile with the profile of the tool (5).