CYLINDER FOR LOCKS

Description

DESCRIPTION Attached to a patent application for an INDUSTRIAL INVENTION having by title “Lock cylinder” On behalf of: SECUREMME SRL VIA CONCORDIA, 28 23854 OLGINATE LC ******* The present invention relates to a lock cylinder. In particular, the present invention falls within the sector of lock protection mechanisms, and more specifically cylinders into which the key must be inserted to open the lock itself. 5 Generally, the cylinders for the locks protrude from the locks and the the key insertion slot is generally exposed. In other words, the cylinder slot is potentially subject to possible tampering with the aid of specific devices that can be inserted within the crack itself. 10 It is known to apply devices that are installed frontally (in a portion of the cylinder outside the door panel) to protect the cylinder (usually made of brass) in order to avoid the possible drilling of the cylinder using a drill, thus effectively defining anti- cemented and tempered drill bits. 15 However, such devices are expensive and complex in the installation. In other words, in the state of the art there are no economical devices that allow to prevent unauthorized access to the channel defined by the cylinder cracking by tools aimed at tampering with the 20 cylinder itself and therefore to the unlocking of the lock. A particularly well-known example of such instruments is the so-called “mice mouse”. decoder”, which is a small tool equipped with a series of mechanical pins which, following a specific action by an operator, tend to assume the position foreseen by the cylinder mapping, unlocking it the rotation. To overcome this problem, there are solutions which, basically, aim to complicate the key geometry and the number of pin groups in the 5 cylinder, making it more difficult to tamper with. Furthermore, according to a recent trend, complex and expensive tools such as the Mickey Mouse decoders are being replaced with cheaper systems, which they use in combination a blank key with a known profile and a sheet of plastically deformable material, typically aluminum, in 10 implementation of a technique called "burglary by impression", “impressioning” or “imprinting”. The aluminum foil, placed on the faces of the inserted key blank in the crack and subjected to continuous rotations and counter-rotations, tends to give way and deform under the action of the pins, assuming the shape of the 15 correct key and rotating the rotor body until the opening of the lock. This procedure, in addition to being cheaper than the decoder mouse, It uses a principle that bypasses the protection systems described above, making their lock vulnerable. 20 The technical task of the present invention is therefore to provide a lock cylinder that is capable of overcome the drawbacks that have emerged from the prior art. In particular, it is the purpose of the present invention to provide provision of a lock cylinder that has a high degree of security 25 safety. A further aim of the present invention is therefore that of provide a lock cylinder that is capable of protect the lock from forced entry using the impressioning technique or imprinting. The specified technical task and the specified purposes are essentially achieved by a lock cylinder comprising the features techniques set forth in one or more of the appended claims. Dependent claims correspond to possible forms of 5 realization of the invention. In particular, the specified technical task and the specified purposes are essentially achieved by a lock cylinder comprising a stator body developing along a development axis between a first extreme and a second extreme. 10 Preferably, the stator body is provided with a housing seat developing along the development axis. Preferably, the stator body comprises a first stator cavity developing transversally to the said development axis and flowing into the said accommodation location. 15 A rotor body is configured to rotate within the housing seat of the stator body around said development axis. The rotor body preferably has an insertion slot extending along an insertion axis parallel to said axis of development to receive a cylinder operating key. 20 Preferably, the rotor body has a first rotor cavity developing transversely to the said development axis between a first mouth of the end, flowing into said insertion slot, and a second end mouth, which in at least a first angular position of said rotor body is aligned with the first stator cavity of the stator body. 25 Preferably, the cylinder comprises a first pin extending along a respective central axis and slidably inserted into said first cavity rotor so as to translate along a respective first translation axis parallel to said central axis, following insertion of said key of operation in said insertion slot. Preferably, the first pin is shaped to fit entirely in the rotor body when a correct operating key is inserted into the slot. Preferably, the first pin is divided into a first and a second 5 elements separated from each other. Advantageously, this allows for differentiated management the interaction between the first pin and the rotor body as a function of the different positions assumed along the first rotor cavity. Preferably, the first element develops along the central axis of the 10 first pin between a first end, shaped to mate with a profile of said operating key, and a second end. Preferably, the second element develops along the said central axis between a head, attached to the second extremity of the first element, and a base, in which the head of the second element has a section 15 transversal to said central axis of smaller size than the base. Preferably, the rotor body comprises at least one second cavity rotor, coplanar and angularly offset with respect to the first cavity rotoric. Preferably, the second rotor cavity has a cross-section 20 transverse suitable for receiving the head of the second element of the first pin. Advantageously, this way it is possible to prevent break-ins for impression (or through new decoder systems such as “Mickey Mouse”), in how much during the deformation of the aluminum sheet the first pin reaches an axial position where the first element is housed in the 25 first rotor cavity and the second element is housed in the first cavity stator, allowing the rotation of the rotor body between the first position angular and the second angular position, in which the rotor body stops due to the entry of the second element into the second cavity rotoric. 30 Preferably, the second rotor cavity has a cross-section transverse with a size suitable to receive the head but not the base of the second element of the first pin. This advantageously ensures the correct functioning of the cylinder in normal operations (opening with correct key and locking with key incorrect). 5 Preferably, the cylinder is configured to assume at least three different configurations. Preferably, in a first, block configuration, the first element of the first pin is placed between the first stator cavity and the first rotor cavity, preventing rotation of the rotor body in the stator body. 10 Preferably, in a second, opening configuration, the first element and the second element are both housed in the first rotor cavity and allow the complete rotation of the rotor body in the stator body. Preferably, in a third, anti-burglary configuration, the first 15 element of the first pin is housed in the first rotor cavity and the second element of the first pin is housed in the first cavity stator, subjected to a thrust action towards the rotor body. Preferably, the cylinder is configured to shift from first to third configuration following a gradual translational movement of the first 20 pin from a locking position, straddling the first stator cavity and the first rotor cavity, to an apparent unlocked position, in which the second end of the first element is flush with one end mouth radially external of the first rotor cavity. Preferably, the rotor body comprises two second rotor cavities, 25 each placed in a respective second angular position out of phase from the first angular position of an angle less than or equal to 180°. Preferably, the second element of the first pin has the conformation of two superimposed and concentric cylinders, in which a first cylinder of smaller diameter defines the head of the second element and a 30 second cylinder of larger diameter defines the base of the second element. Further features and advantages of the present invention will appear. made clearer by the indicative, and therefore non-limiting, description, of a preferred, and therefore non-exclusive, embodiment of a cylinder for locks in accordance with what is illustrated in the attached tables 5 of drawing, in which: - Figure 1 shows a partial perspective view of a cylinder for locks according to the present invention; - figure 2 shows a perspective view of a detail of the figure 1, with some parts removed to highlight others; 10 - Figure 3 shows a schematic longitudinal section view of a lock cylinder according to the present invention; - figures 4 and 5 show schematically the cylinder of figure 3 in front view and in an open configuration; - figures 6 and 7 show schematically the cylinder of figure 3 in 15 front view and in an anti-burglary configuration; - figure 8 shows schematically the cylinder of figure 3 in view frontal and in a rest configuration. With reference to the attached figures, with 1 it was overall a cylinder for locks is indicated which, for simplicity of description, will be 20 hereinafter referred to as cylinder 1. The term cylinder 1 refers to the device that allows the opening and the closing of a lock that can be installed on a door to allow selective access to an environment. Preferably, but not limited to, This solution refers to a European type 1 cylinder. 25 The cylinder 1 comprises a stator body 2 extending along an axis of development “X” between a first extreme 2a and a second extreme 2b. The stator body 2 comprises a housing seat 3 which develops along the development axis “X”. A rotor body 4 is arranged within the housing seat 3 of the body 30 stator 2. The rotor body 4 is in use rotatable within the stator body 2. Preferably, the rotor body 4 has a cylindrical shape for rotate around its own central axis parallel to the development axis “X” inside the housing seat 3 of the stator body 2. The rotor body 4 has an insertion slot 5 extending along an insertion axis “A” for a key “C”. In other words, the slot of 5 insert 5 defines an input channel for the “C” key. This slot 5 develops along the insertion axis “A” starting from a entrance section facing externally to cylinder 1 and accessible using the said key “C”, up to a terminal section, which can be facing (i.e. open) from the opposite side of the cylinder or drowned 10 inside the same. The slot 5 is therefore an inlet channel of the rotor body 4 within which In use, the “C” key can be inserted to operate the lock. In other words, the insertion axis “A” is shaped to receive the cylinder 1 “C” operating key. 15 The insertion axis “A” is parallel to the development axis “X” of the body stator 2. The insertion axis “A”, moreover, is parallel to the central axis of the body rotor 4. In the attached figures, and as can be seen in particular in figure 1, 20 the development axis “X” and the insertion axis “A” coincide with each other. In this regard, it should be noted that the expression “operating key” refers to intends in this text to define any key that presents a rough profile compatible with the geometry of slot 5; among these, the “correct operating key” is a key that in addition to the profile 25 compatible presents a mapping of the same corresponding to the geometry of the pin or pins arranged along the slot, which is inserted the rotor body 4 is free to rotate in the stator body 2. The rotor body 4 also has a first rotor cavity 6 developing transversely to the development axis “X”. 30 Preferably, the first rotor cavity 6 extends between a first mouth of end 6a, flowing into said insertion slot 5, and a second end mouth 6b. Note that the first rotor cavity 6 is to be considered as a through cavity, with the first end mouth 6a facing into slot 5 and the second mouth of open end 6b on the radially external surface of the rotor body 5 2. Preferably, the first rotor cavity 6 has a development substantially radial with respect to the development axis “X”. In the preferred embodiment, the first rotor cavity 6 has substantially cylindrical conformation, preferably presenting a 10 first diameter “d1”. A first pin 7 develops along a respective central axis “B” between a first terminal portion 7a and a second terminal portion 7b. The first pin 7 is slidably inserted into the first rotor cavity 6 in so as to be able to translate along a respective first translation axis 15 parallel to said central axis “B”. Preferably, the first pin 7 is movable in the first rotor cavity 6 a following insertion of the said operating key “C” into the slot 5 of insertion. This translation along the translation axis occurs as a result of a 20 insert the operating key “C” into the insertion slot 4, that is, following contact between the surface of the key and the first pin 7, which you encounter during insertion. In particular, the first pin 7 is slidable along the first axis of translation between a position of maximum insertion and a position of 25 minimum entry. In the fully inserted position, the first pin 7 is completely housed in the rotor body 4, with the first terminal portion 7a inserted in the slot 5 and a second terminal portion 7b placed along the first rotor cavity 6. 30 Preferably, the first pin 7 is shaped so as to fit entirely in the rotor body when a correct operating key “C” is inserted into slot 5. The correct “C” insertion key, in fact, has a notch on one its surface sized to receive the first portion terminal 7a of the first pin 7 placing it in an unlocked position, 5 intermediate between the maximum insertion position and the position of minimum insertion, in which the second terminal portion 7b is positioned substantially flush with the second end mouth 6b of the first rotor cavity 6. The stator body 2 comprises a first stator cavity 8 developing 10 transversely to the development axis “X” along its own central axis “D” and flows into the housing seat 3. Preferably, the first stator cavity 8 has a development substantially radial with respect to the development axis “X” and is in connection (of fluid) with the housing seat 3 for the rotor body 15 4. In at least a first angular position of the rotor body 4, the central axis “D” of the first stator cavity 8 is aligned with the central axis “B” of the first rotor cavity 6, i.e. preferably along the translation axis. This allows the first pin 7 to slide along the two cavities 6, 8, 20 positioning itself completely in the first rotor cavity 6 or between the stator cavity 8 and the rotor cavity 6 depending on the presence and type of insertion key. In the preferred embodiment, the first stator cavity 8 has substantially cylindrical conformation, preferably presenting a 25 first diameter “D1” corresponding to that of the first rotor cavity 6. This first stator cavity 8 could be placed in the semi-part (in use) upper part of the stator body 2 or in the half-part (in use) inferior. In the illustrated and preferred embodiment, the first stator cavity 30 6 is made in the lower half of the stator body 2. Preferably, therefore, inside the first stator cavity 6 is at least one first counter pin 9 is slidably inserted. The first counter pin 9 develops along its own main axis aligned with the central axis “D” of the first stator cavity 8. The first counter pin 9 is preferably associated or associable with a 5 elastic body 9a (preferably a return spring) whose action push allows the counter pin 9 to be kept in one position pre-established which, as will become clearer in the continuation of the This description will selectively allow the rotation of the body rotor 4 within the stator body 4, or will prevent it. 10 Alternatively, in any case, the first stator cavity could be located in the upper half of the stator body 2 and does not require of the counter-pin and / or the spring, acting by gravity (keeping preferably the “D” axis alignment). According to one aspect of the present invention, the first pin 7 is 15 divided into a first 10 and a second element 11 separate from each other. The first 10 and the second element 11 are arranged in succession between them along the first rotor cavity 6, with the second element 11 placed in radially external position with respect to the first element 10. Preferably, at least in the position of maximum insertion of the first 20 pin 7, the second pin 11 is in contact with the first element 10 in pushed on the same. Furthermore, even when it is inside the first stator cavity 8, the second element 11 of the first pin 7 is always subject to an action thrust oriented towards the rotor body 4. 25 This thrust can be generated by the counter pin 9 (i.e. by the body elastic 9a) or by the force of gravity depending on the embodiment of the cylinder and / or the angular position of the rotor body 4. Preferably, the rotor body 4 comprises at least one second cavity rotor 12, coplanar and angularly offset with respect to the first 30 rotor cavity 6, having a cross-section suitable for receiving a head 11a of the second element 11 of the first pin 7. The second rotor cavity 12, therefore, has a cross-section of a size (i.e. diameter or width) smaller than that of the counter pin 9, but still greater than or equal to that of head 11a. In other words, preferably the head 11a of the second element 11 and the 5 second rotor cavity 12 have a cross-section to the axis central “B” with a smaller size than the first diameter “d1”; more preferably, the head 11a of the second element 11 and the second cavity rotor 12 have a cross-section to the central axis “B” of diameter smaller than the first diameter “d1” 10 In at least one second angular position of the rotor body 4, the second rotor cavity 12 is aligned with the first stator cavity 8 along the axis central “D”. This advantageously allows us to overcome the problem of imprinting since, during the impression phase of the “F” sheet of 15 aluminum, the first pin 7 reaches an axial position where the first 10 and the second element 11 are arranged respectively in the first rotor cavity 6 and in the first stator cavity 8, allowing rotation of the rotor body 4 only until reaching the second position angular, in which the second element fits into the second cavity 20 rotor 12 stopping the rotation. The second element 11, therefore, depending on its location in the first rotor cavity 6 or in the first stator cavity 8, determines the possibility of complete rotation of the rotor body 4 (therefore of opening of the lock). 25 In greater detail, therefore, the first pin 7 is movable along the first rotor cavity so as to assume at least three positions defining three different configurations of cylinder 1. In a first, block configuration, the first element 10 of the first pin 7 is arranged between the first stator cavity 8 and the first 30 rotor cavity 6, preventing the rotation of the rotor body 4 in the body stator 2. For example, in this first configuration the first pin 7 could be in the minimum insertion position. In a second, opening configuration, the first pin 7 (therefore the first element 10 and the second element 11) is entirely 5 housed in the first rotor cavity 6, with the second terminal portion 7b substantially flush with the second end mouth 6b, allowing the rotor body 4 to rotate completely in the stator body 2. This second configuration corresponds to the unlock position of the first pin 7, illustrated as an example in figures 4-5. 10 In a third, anti-burglary configuration, the first element 10 of the first pin 7 is internally housed in the first rotor cavity 6 and the second element 11 of the first pin 7 is entirely housed in the first stator cavity 8, allowing rotation of the body again rotor 4. 15 In other words, cylinder 1 is configured to shift from first to third configuration following a gradual translational movement of the first pin 7 from a position where the first element 10 straddles the first stator cavity 8 and the first rotor cavity 6 to a position where the second end 10b of the first element 10 is flush with the first 20 rotor cavity 6, in particular with its second end mouth 6b. This third configuration is illustrated by example in figures 6-7. In this third configuration, the second element 11 of the first pin 7 is subjected to a thrust action towards the rotor body 4 which determines, at reaching the second angular position of the same, it engages 25 with the head 11a in the second rotor cavity 12, stopping the rotation of the rotor body 4. Advantageously, this ensures that upon reaching of the third configuration, intermediate between the first and the second, the thrust of the pin on the deformable sheet “F” is interrupted, allowing the 30 rotation of the rotor body 4 between the first and second angular positions, until its definitive blocking. Upon reaching the second angular position with the cylinder in the third configuration, the system enters a lock condition with the second element 11 of the first pin 7 housed in the second cavity rotor 12, preferably without the possibility of extraction. 5 The blocking condition is therefore preferably irreversible. Therefore, in the third configuration of the cylinder, the first pin 7 assumes an apparent unlocked position. Note that cylinder 1 is preferably (but not necessarily) configured to also assume a fourth, rest, configuration, in 10 where the first pin 7 is in the maximum insertion position and the first counter pin 9 is arranged between the first stator cavity 8 and the first rotor cavity 6, preventing rotation of the rotor body 4. This configuration, corresponding to the maximum insertion position of the first pin 7, is assumed in the absence of operating keys “C” 15 inside slot 5. Structurally, the first element 10 preferably develops along the central axis “B” between a first end 10a, shaped for mate with a correct “C” drive key profile, and a second end 10b. 20 The first end 10a of the first element 10 corresponds to the first terminal portion 7a of the first pin 7. The second element 11 develops along the central axis “B” between a head 11a and a base 11b. At least in the maximum insertion position of the first pin 7, the head 25 11a of the second element 11 is attested to (or in contact with) the second end 10b of the first element 10. As previously described, preferably the 11a head of the second element 11 has a cross-section to said axis central “B” with smaller dimensions than base 11b. 30 In other words, given a transverse plane, preferably orthogonal, at the central axis “B”, the size of the head 11a evaluated in this plane is lower than that of base 11b. Furthermore, preferably, the head 11a has a cross-section of said central axis "B" which is smaller in size than the first one counter pin 9, so as to avoid that, in the second configuration of the 5 cylinder 1, the first counter pin 9 can fit into the second cavity rotor 12. In this text, the term "encumbrance" refers to the area under which said plane transversal to the central axis “B”, with peripheral edges (i.e. distal from the central axis “B”) of the head 11a and the base 11b. 10 In particular, this term refers to the maximum area width of these portions, which especially in the case of the base could also present areas (distal from the head) of smaller width. Advantageously, the presence of a second element 11 with head 11a of smaller size than the base 11b allows to avoid the interaction between 15 any other component of the set first pin 7 - first counter pin 9 to fit into the second rotor cavity 12. Preferably, the sum of the lengths of the first 10 and the second element 11 of the first pin 7, measured along the central axis “B” of the first rotor cavity 6, corresponds to the sum of a length of the 20 first rotor cavity 6 and a key profile depth of correct “C” drive at said first rotor cavity 6. Preferably, the rotor body 4 comprises two second rotor cavities 12, each placed in a respective second angular position 25 offset from the first angular position by an angle less than or equal to 180°. Advantageously, this prevents the rotor body from completely rotating. 4 also in the third configuration of cylinder 1. In the illustrated embodiment, the second rotor cavities 12 are 30 arranged one at approximately 180° and the other at approximately 135° from the first rotor cavity 6. The angular arrangement of the second rotor cavity(s), however, It could be different and more than two could be foreseen second rotor cavities. In the preferred embodiment, the second element 11 of the first 5 pin 7 has the shape of two overlapping cylinders and preferably concentric. Preferably, the second element 11 of the first pin 7 comprises a first cylinder 13 and a second cylinder 14. The first cylinder 13, of smaller diameter, defines the head 11a. The first 10 cylinder 13, therefore, has a second diameter “d2” smaller than the first diameter “d1”. The second cylinder 14, of larger diameter, defines the base 11b of the second element 11. The second cylinder 14, therefore, has a diameter substantially 15 corresponding (with a tolerance to allow it to slide) to the first diameter “d1”. Preferably, the second cylinder 14 has a diameter corresponding to that of the second end 10b of the first element 10 of the first pin 7. 20 Preferably, the second cylinder 14 has a diameter corresponding to that of the first counterpin 9. In the most advanced embodiments, the cylinder comprises a plurality of further pins 15, 17 and a plurality of corresponding counterpins 16 distributed along the development axis “X”. 25 The pins and counter pins have lengths (i.e. development along the (respective central axes) variable to allow the rotation of the rotor body 4 in the stator body 2 only in the presence, in the slot 5, of the key correct “C” drive. Optionally, in some embodiments, the cylinder can 30 comprise two different groups of additional pins, one provided with second pins 15 each associated with a corresponding second counter pin 16 and the other equipped with third pins 17 operating by gravity. In this configuration, preferably each second pin is aligned, along the same operating axis, to a third pivot. Both the second and third pins are movable, as are the first pins 7, 5 along the respective cavities between a plurality of locking positions, wherein interfere with the rotation of the rotor body 4, and a position of unlocking, in which they are positioned inside the respective cavity so that neither the pin nor any counter-pin are placed astride the body stator 2 and the rotor body 4, without hindering the rotation of the latter. 10 Note also that cylinder 1 could comprise a plurality of primes pins 7, possibly arranged in succession along the development axis “X” and each associated with a respective first rotor cavity and a first stator cavity. The operating principle of the cylinder is shown below 15 the present invention. In normal lock opening operations, in slot 5 of the rotor body 4 the correct operating key “C” is inserted, equipped with a mapping that allows it to be positioned during its insertion, all pins and additional pins in the unlocked position. 20 In particular, with reference to the first pin 7, the operating key “C” correct proceeds to bring it from the maximum insertion position to the unlocked position, with the first 10 and the second element 11 both placed in the first rotor cavity 6. Conversely, when a key blank is inserted into slot 5 25 covered with aluminum foil “F” in a break-in attempt by impression, all pins and additional pins are brought into one position of maximum extraction, the “F” sheet being initially flush with the first end mouth 6a of the first rotor cavity 6 (and of the cavities in which the additional pins are inserted). 30 At this point, the rotation and counter-rotation action that is subjected the key blank carries both the first pin 7 and the further ones pins 15 to force the sheet “F”, progressively deforming it in matching the profile recesses until reaching a unlock position. With reference to the first pin 7, the first unlocking position reached is 5 that of "apparent unlocking" corresponding to the third configuration of the cylinder. Once this position is reached, the friction with the walls of the first rotor cavity 6 together with the minimum rotation to which the rotor body 4 is subjected prevents further deformation of the “F” sheet. 10 Therefore, when the unlock position is reached by all the additional pins 15, with the first pin 7 in the unlocked position apparently, the rotor body 4, subjected to a torsion by the key blank, starts to rotate moving from the first position angular. 15 Upon reaching the second angular position, however, the rotation is stopped by the action of the second element 11 of the first pin 7, which by acting in thrust on the rotor body 4 fits into the second cavity rotor 12, blocking cylinder 1, preferably irreversibly. The invention achieves its intended purposes and provides important advantages. 20 In fact, the preparation of a first segmented and sectioned pin differentiated allows to overcome the problem of break-ins for impression, or impressioning, or by means of new decoder systems such as “Mickey Mouse significantly increasing the safety of the cylinder. THE AGENCY Engineer Umberto Zermani Biondi Orsi

Claims

1. Cylinder (1) for locks comprising: - a stator body (2) extending along a development axis (X) between a first end (2a) and a second end (2b) and provided with: - a housing seat (3) extending along the development axis (X); - a first stator cavity (8) extending transversely to said development axis (X) and leading into said housing seat (3); - a rotor body (4) configured to rotate within the housing seat (3) of the stator body (2) around said development axis (X) and featuring: - an insertion slot (5) extending along an insertion axis (A) parallel to said development axis (X) to receive an operating key (C) of the cylinder (1);- a first rhetorical cavity (6) extending transversally to said development axis (X) between a first end mouth (6a), leading into said insertion slot (5), and a second end mouth (6b), which in at least a first angular position of said rotor body (4) is aligned with the first stator cavity (8) of the stator body (2); - a first pin (7) extending along a respective central axis (B) and slidably inserted into said first rhetorical cavity (6) so as to translate, along a respective first translation axis parallel to said central axis (B), following insertion of said operating key (C) into said insertion slot (5); said first pin (7) being shaped so as to be housed entirely in the rotor body (4) when a correct operating key is inserted into the slot (5);characterized by the fact that: - said first pin (7) is divided into a first (10) and a second element (11) separate from each other, in which: - the first element (10) extends along the central axis (B) 21 .S0508.12.IT. 13 Eng. Umberto Zermani Biondi Orsi (Registered name η. 1518BM) of the first pin (7) between a first end (10a), shaped to couple with a profile of said operating key (C), and a second end (1 Ob); - the second element (11) extends along said central axis (B) between a head (11b), attached to the second end (1 Ob) of the first element (10), and a base (11 b), in which the head (11 a) of the second element (11) has a cross-section to said central axis (B) of smaller size than the base (11 b);and whose rotor body (4) comprises at least a second rotor cavity (12), coplanar and angularly offset with respect to the first rotor cavity (6), having a cross-section suitable for receiving the head (11a) of the second element (11) of the first pin (7).; 2. Cylinder according to claim 1, wherein the second rotor cavity (12) has a cross-section with dimensions suitable to receive the head (11 a) but not the base (11 b) of the second element (11) of the first pin (7).

3. Cylinder according to claim 1 or 2, configured to assume at least three different configurations: - a first, locking configuration, in which the first element (10) of the first pin (7) is arranged between the first stator cavity (8) and the first rotor cavity (6), preventing the rotation of the rotor body (4) in the stator body (2); - a second, opening configuration, in which the first element (10) and the second element (11) are both housed in the first rotor cavity (6) and allow the complete rotation of the rotor body (4) in the stator body (2); - a third, burglar-proof configuration, in which the first element (10) of the first pin (7) is housed in the first rotor cavity (6) and the 21 .S0508.12.IT. 13 Eng. Umberto Zermani Biondi Orsi (Registered number η. 1518BM) second element (11) of the first pin (7) is housed in the first stator cavity (8), subjected to a thrust action towards the rotor body (4).

4. Cylinder according to claim 3, configured to switch from the first to the third configuration following a gradual translational movement of the first pin (7) from a locked position, straddling the first stator cavity (8) and the first rotor cavity (7), to an apparent unlocked position, wherein the second end (1 Ob) of the first element (10) is flush with a radially external end port (6b) of the first rotor cavity (6).

5. Cylinder according to claim 3 or 4, wherein, when the cylinder is in the third configuration, a rotation of the rotor body (4) is allowed between the first angular position and a second angular position, wherein the second rotor cavity (12) is aligned with the first stator cavity (8) and receives the head (11 a) of the second element (11) of the first pin (7), stopping the rotation.

6. Cylinder according to any of the preceding claims, wherein the sum of the lengths of the first (10) and second element (11) of the first pin (7), measured along the central axis (B) of the first pin (7), corresponds to the sum, measured along the same central axis (B), of a length of the first rotor cavity (6) and of a depth of the profile of said operating key (C).

7. Cylinder according to any of the preceding claims, wherein, when located inside the first stator cavity (8), the second element (11) of the first pin (7) is always subject to a thrust action oriented towards the rotor body (4).

8. Cylinder according to claim 7, wherein said pushing action is 21 .S0508.12.IT. 13 Eng. Umberto Zermani Biondi Orsi (Registered name η. 1518BM) exerted by an elastic body (9a) or by the force of gravity.

9. Cylinder according to any of the preceding claims, comprising a first counter-pin (9) slidable in said first stator cavity (8) and associated, at least in said first angular position of the rotor body, with the first pin (7).

10. Cylinder according to any of the preceding claims, comprising an elastic body (9a) operatively active on said counter-pin (9) to push it along said first rotor cavity (8) in the direction of the rotor body (4).

11. Cylinder according to any of the preceding claims, wherein the rotor body (4) comprises two second rotor cavities (12), each located in a respective second angular position offset from the first angular position by an angle less than or equal to 180°.

12. Cylinder according to any of the preceding claims, wherein the second element (11) of the first pin (7) has the shape of two superimposed and concentric cylinders, wherein a first cylinder (13) of smaller diameter defines the head (11a) of the second element (11) and a second cylinder (14) of larger diameter defines the base (11b) of the second element (11).

13. Cylinder according to claim 12, wherein said second cylinder (14) has a diameter corresponding to that of the second end (1 Ob) of the first element (10) of the first pin (10) and / or to that of the first counterpin (9).

14. Cylinder according to any of the preceding claims, comprising a plurality of further pins (15) and a plurality of 21 .S0508.12.IT.13 Eng. Umberto Zermani Biondi Orsi (Registered number η. 1518BM) corresponding counterpins (16) distributed along the development axis (X) and with variable lengths to allow the rotation of the rotor body (4) only in the presence, in the slot (5), of the correct operating key (C).