ES2938041T3 - Security system and lock - Google Patents

Abstract

A security system (100) comprising a lock (1) and an operating key (10) to operate the lock (1). The lock (1) comprises: - a cylinder (3) having a first cavity (4) inside which the first pin (5) is slidably mounted, and a second cavity (6) inside the on which a second pin (7) is slidably mounted, and- a locking body (2) having a groove (8) inside which is a counter-pin (9).) is slidably mounted, said counter-pin (9) being designed to cooperate with the second pin (7) in a neutral position of the cylinder (3) in which the second cavity (6) of the cylinder (3) is aligned with the groove (8) of the lock body (2). The counterpin (9) is configured to be located at least partially inside the second cavity (6) when the cylinder (3) is in the neutral position, so as to prevent rotation of the cylinder (3). The drive key ( 10) comprises an elongated body (11) on which there is a spherical element (13), with a diameter (D) and mobile according to a direction of movement (X) transverse to the elongated body (11).), is mounted. The pins (5, 7) are configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in the neutral position. The spherical element (13) is configured to fit with the pins (5, 7) to arrange them at a second distance (H) greater than the first distance (h) and equal to the diameter (D) when the elongated body (11 ) is inserted into the insertion channel (3a), so that the counter-pin (9) moves completely in the slot (8) and the cylinder (3) can rotate freely inside the lock body (2). has a diameter (D) and is movable along a direction of movement (X) that is transverse to the elongated body (11), it is mounted. The pins (5, 7) are configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in the neutral position. The spherical element (13) is configured to engage with the pins (5, 7) to arrange them at a second distance (H) greater than the first distance (h) and equal to the diameter (D) when the body is elongated ( 11) is inserted into the insertion channel (3a), so that the counter -pin (9) moves completely in the slot (8) and the cylinder (3) can rotate freely inside the lock body (2 ). which has a diameter (D) and is movable along a direction of movement (X) which is transverse to the elongated body (11), is mounted. The pins (5, 7) are configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in the neutral position. The spherical element (13) is configured to engage with the pins (5, 7) to arrange them at a second distance (H) greater than the first distance (h) and equal to the diameter (D) when the body is elongated ( 11) is inserted into the insertion channel (3a), so that the counter -pin (9) moves completely in the slot (8) and the cylinder (3) can rotate freely inside the lock body (2 ).7) are configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in the neutral position. The spherical element (13) is configured to mesh with the pins (5, 7) to arrange them at a second distance (H) that is greater than the first distance (h) and equal to the diameter (D) when the elongated body (11) is inserted in the insertion channel (3a), so that the counter-pin (9) moves completely inside the slot (8) and the cylinder (3) can rotate freely inside the lock body ( 2).7) are configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in the neutral position. The spherical element (13) is configured to mesh with the pins (5, 7) to arrange them at a second distance (H) that is greater than the first distance (h) and equal to the diameter (D) when the elongated body (11) is inserted in the insertion channel (3a), so that the counter-pin (9) moves completely inside the slot (8) and the cylinder (3) can rotate freely inside the lock body ( 2).7) to arrange them at a second distance (H) greater than the first distance (h) and equal to the diameter (D) when the elongated body (11) is inserted into the insertion channel (3a), so so that the counterbolt (9) moves completely inside the slot (8) and the cylinder (3) can rotate freely inside the lock body (2).7) to arrange them at a second distance (H) greater than the first distance (h) and equal to the diameter (D) when the elongated body (11) is inserted into the insertion channel (3a), so that the counterpin (9) moves completely inside the slot (8) and the cylinder (3) can rotate freely inside the lock body (2). (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Security system and lock

The present invention relates to a security system and a lock.

In particular, the lock referred to herein is of the cylinder type comprising a stator (defining the lock body) and a rotor (defining the lock cylinder).

The cylinder is rotatably mounted in the lock body and has a port for inserting the operating key.

Typically, the lock further comprises locking bolts mounted on the barrel and configured to engage a correspondingly shaped profile of the key.

If the key inserted in the entry is authorized, that is, it has a profile shaped such as to allow correct engagement with the locking bolts, the lock can be unlocked, that is, the cylinder can rotate inside the body of the lock. lock to allow rotation of the bolt that opens the door on which the lock is mounted. However, the Applicant realized that it is now becoming easier for malicious persons to copy the shaped profile of an operating key to gain access to the corresponding lock. In particular, the Applicant found that the use of 3D printing techniques can make it possible to create a cloned key in a short time, simply from a photograph or a three-dimensional acquisition of an unattended key. FR2492872A1 discloses a locking system and a lock according to the preamble of claims 1 and 6. Furthermore, the documents WO2019/211740A1, WO2012/125512A1 and EP3483365A1 disclose examples of known locking assemblies and keys for operating the same.

In this context, the technical task underlying the present invention is to propose a security system and a lock that overcomes one or more of the aforementioned drawbacks of the prior art.

In particular, it is an object of the present invention to provide a security system that makes it possible to increase the level of efficiency and security of the lock by avoiding the unlocking of the lock by means of cloned keys. The technical task and the specified objects are substantially achieved by means of a security system comprising the technical features set forth in one or more of the appended claims.

In particular, the present invention provides a security system comprising a lock and a key to operate the lock.

The lock comprises a lock body and a cylinder.

The lock body has an entrance within which the cylinder is rotatably mounted. Advantageously, the cylinder has:

- a channel to insert the drive key,

- a first cavity leading to the insertion channel, inside which a first movable bolt is slidably mounted, which is movable towards and from the insertion channel,

- a second cavity that leads, on a first side, towards the insertion channel, and on a second side opposite to the first, towards the body of the lock, inside which a second movable bolt is slidably mounted, which is Movable to and from the insertion channel.

In addition, the lock body has a groove leading to the entrance, inside which a counterbolt is slidably mounted, said counterbolt being designed to cooperate with the second bolt in a neutral position of the cylinder in which the second cavity of the cylinder is aligned with the groove in the lock body.

Advantageously, the pin is configured to be arranged at least partially inside the second cavity when the cylinder is in the neutral position, to prevent rotation of the cylinder.

The drive key comprises an elongated body that can be inserted into said insertion channel.

Advantageously, a spherical element, which has a diameter "D" and is mobile along a direction "X" of movement that is transverse to a direction "Y" of main extension of the elongated body, is mounted on said body. in a long way

Therefore, the first and the second pin are configured to be arranged at a first distance "h" when the elongated body is withdrawn from the insertion channel and the cylinder is in the neutral position, while the spherical element is configured to engage with the first and the second bolt in order to arrange them at a second distance "H" which is greater than the first distance "h" and equal to the diameter "D" when the elongated body is inserted into the channel of insertion, such that the counterbolt moves completely within the slot and the cylinder is free to rotate within the lock body.

The presence of the two movable pins therefore allows the rotation of the cylinder, and therefore the release of the counter-pin from the second cavity, solely and exclusively by inserting a drive key provided with the corresponding movable spherical element.

The spherical element is advantageously configured to be interposed between the two bolts and to be pressed by the first bolt so that the spherical element pushes against the second bolt, thus causing the displacement of the cooperating counterbolt to be fully disposed within the groove, leaving the cylinder free to spin.

Copying of a key provided with a dynamic element such as the movable spherical element is therefore impossible to do simply by taking a photograph, which effectively makes the lock impenetrable to unauthorized operating keys of the type that is the subject of the present invention.

Advantageously, the presence of a spherical element in the key and of two movable pins in the lock makes it possible to increase the level of security and reliability of the security systems known up to now.

A lock comprising a cylinder and a lock body according to the foregoing, and an operating key comprising an elongated body on which the above-described spherical element is mounted, also forms part of the present invention.

The dependent claims, incorporated herein by reference, correspond to different embodiments of the invention.

Other characteristics and advantages of the present invention will become more evident from the indicative, and therefore non-limiting, description of a preferred, but not exclusive, embodiment of a security system, a lock and a related operating key, as illustrated in the attached drawings where:

- Figure 1 is a schematic perspective view of a security system according to the present invention,

- Figure 2 is a schematic perspective view of a drive key according to the present invention,

- Figure 2A is a cross section in the area of the spherical element of the key of Figure 2,

- Figure 3 is a cross section of a lock according to the present invention, and

- Figure 4 is a cross section of the lock of Figure 3 when the key of Figure 2 is inserted in the cylinder of the lock.

With reference to the attached drawings, the number 100 indicates, as a whole, a security system, hereinafter simply indicated as the system 100.

The system 100 comprises a lock 1 and an operating key 10 to operate the lock 1.

According to the present invention, the lock 1 comprises a lock body 2 and a cylinder 3, wherein the lock body 2 has an entrance 2a within which the cylinder 3 is rotatably mounted.

The cylinder 3 has an insertion channel 3a for inserting the drive key 10, preferably along an insertion direction A parallel to an axis R of rotation of the cylinder 3.

In other words, the insertion channel 3a extends axially through the cylinder 3 and is shaped to receive a key 10 authorized to open the lock 1.

The cylinder 3 has at least a first cavity 4 leading to the insertion channel 3a, inside which a first movable pin 5 is slidably mounted, which is movable towards and from the insertion channel 3a.

The cylinder 3 has a second cavity 6 which leads, on a first side, towards the insertion channel 3a, and on a second side opposite to the first, towards the body 2 of the lock, inside which a second is slidably mounted. movable bolt 7, which is movable towards and from the insertion channel 3a.

In particular, the first and second pins 5, 7 face each other and lead to opposite sides of the insertion channel 3a.

With particular reference to the embodiment shown in Figures 3 and 4, preferably, the first bolt 5 is movable along a first axis 5a of movement and the second bolt 7 is movable along a second axis 7a of movement, wherein said movement axes 5a, 7a are parallel to each other, and even more preferably coincident with each other.

The body 2 of the lock has a groove 8 leading to the entrance 2a, inside which a counterbolt 9 is slidably mounted, said counterbolt 9 being designed to cooperate with the second bolt 7 in a neutral position of the cylinder 3 in in which the second cavity 6 of the cylinder 3 is aligned with the groove 8 of the body 2 of the lock.

In particular, the second bolt 7 is configured to keep in contact with the counter bolt 9.

With particular reference to the embodiment shown in Figures 3 and 4, the pin 9 is preferably movable along a third axis 9a of movement. Advantageously, the counterpin 9 is configured to be arranged at least partially inside the second cavity 8 when the cylinder 3 is in the neutral position, in order to prevent the rotation of the cylinder 3.

In other words, when cylinder 3 is in the neutral position and counterbolt 8 is arranged to straddle second cavity 8 and slot 9, any rotation of cylinder 3 within lock body 2 is prevented. Preferably, the second pin 7 has a first portion 7' aligned with the first pin 5, along the first movement axis 5a coincident with the second movement axis 7a, and a second eccentric portion 7" aligned with the counterpin 9, along the third axis 9a of movement.

In accordance with the present invention, the operating key 10 comprises an elongated body 11 that can be inserted into the insertion channel 3a of the cylinder 3.

Preferably, furthermore, the key 10 comprises a gripping portion 12 connected to the body 11 in an elongated shape, which is configured to allow the key 10 to be gripped.

Advantageously, a spherical element 13, which has a diameter D and is movable along a direction X of movement that is transverse, preferably perpendicular, to a main direction Y of extension of the body 11 in elongated form, which is mounted on said body 11 of elongated shape.

Preferably, the spherical element 13 is inserted inside a casing 14 of the elongated body 11 leading to the opposite faces 11a, 11b of the elongated body 11 in the respective openings 15a, 15b formed to prevent the spherical element 12 from coming out. completely from the casing 14.

In other words, the spherical element 13 is limited within the casing 14.

With reference to the embodiment shown in the attached drawings, preferably, the openings 15a, 15b have a circular section and have a diameter d smaller than the diameter D of the spherical element.

The casing 14 is preferably obtained at a tip portion of the body 11 of elongated shape.

Advantageously, the spherical element is free to slide inside the housing 14 along the direction X of movement, between a first operative position (shown in dashed lines in Figure 2A), in which the spherical element obstructs the first opening. 15a by partially protruding from the first face 11a, and a second position (shown in Figure 2A), in which the spherical element 13 obstructs the second opening 15b by partially protruding from the second face 11b.

In other words, in the first and second operating positions, a portion of the spherical element 13 defining a spherical cap protrudes from the casing 14.

Advantageously, the first and the second pins 5, 7 are configured to be arranged at a first distance "h" when the elongated body 11 is withdrawn from the insertion channel 3a and the cylinder is in the neutral position, whereas, when the elongated body 11 is inserted into the insertion channel 3a, the spherical element 13 is configured to engage with the first and second bolts 5, 7, interposing between them and arranging them at a second distance "H".

In particular, the second distance H is greater than the first distance h and is equal to the diameter D, so that the counterbolt 9 fully moves within the groove 8 and the cylinder 3 is free to rotate within the body 2 of the lock.

In other words, the spherical element 13 pushes the second bolt 7 into the second cavity 6 so that, as it moves along the second axis 7a of movement, said second bolt 7 pushes the counterbolt 9 fully into the slot 8 , releasing the pin 9 of cylinder 3.

Preferably, the first portion 7' of the second bolt 7 is configured to engage with the spherical element 13 and extends along a respective extension axis that is coincident with the first axis 5a of movement of the first bolt 5, while the second portion 7" of the second bolt 7 is configured to engage counter-bolt 9 and extends along a respective extension axis, which is eccentric with respect to the first axis 5a of movement of the first bolt 5 and coincident with the third axis 9a of movement.

Advantageously, the eccentricity of the second bolt 7 allows the counterbolt 9 to be made in a slot 8 axially central with respect to the body 2 of the lock, thus simplifying the structure of the part and the manufacturing process.

It must be taken into account that a key without the spherical element 13 would therefore not allow the cylinder 3 to be released from the body 2 of the lock.

In fact, if the spherical element 13 is not present, the elongated body 11, when inserted into the insertion channel 3a, would push the second bolt 7 backwards in the second cavity 6, thus completely moving the counterbolt 9 in the slot 8 but also moving the second bolt 7 at least partially in the slot 8, thus preventing the cylinder 3 from rotating freely inside the lock body 2.

Similarly, if the key 10 is provided with a housing 14 but not with the spherical element 13 (which cannot be reproduced by ^3d printing), the second bolt 7 would not be pushed onto the counterbolt 9 and, therefore, the pin 9 would not be pushed all the way back in the slot 8, thus preventing the cylinder 3 from rotating.

Advantageously, therefore, the elongated body 11 allows the authorized key 10 to axially move the bolts 5, 7 and the counterbolt 9 to the respective positions shown in figure 4, in which the counterbolt 9 does not protrude. beyond the outer surface of the cylinder 3, so as not to prevent the cylinder 3 from rotating with respect to the body 2 of the lock.

The cylinder 3 comprises a first elastic element 4a, preferably a spring, mounted inside the first cavity 4 and associated with the first bolt 5. Advantageously, the first elastic element 4a is configured to:

- keeping the first bolt 5 disposed at least partially inside the insertion channel 3a when the elongated body 11 is withdrawn from the insertion channel 3a,

- allowing the first pin 5 to recoil inside the first cavity 4 when the elongated body 11 is pushed towards the insertion channel 3a against the first pin 5, and

- allowing the first pin 5 to move towards the insertion channel 3a when the first pin 5 engages with the spherical element 13.

In the embodiment shown in Figures 3 and 4, therefore:

- the first elastic element 4a is at rest when the elongated body 11 is not inserted in the insertion channel 3a, or it is inserted, but has not yet intercepted the section of the cylinder 3 where the pins 5, 7 are arranged (Figure 3), and the first pin 5 protrudes into the insertion channel 3a,

- the first elastic element 4a experiences a temporary shortening when the first pin 5 is intercepted by the first face 11a of the elongated body 11, while the latter is inserted into the insertion channel 3a, and - the first elastic element 4a returns to the rest configuration, releasing its elastic force, and translates the first bolt 5 inside the first cavity 4 towards the insertion channel 3a, pushing the spherical element 13 onto the second bolt 7, when the first bolt 5 is inserted through the first opening 15a partly in the housing 14, thus pushing the spherical element towards the second opening 15b.

Preferably, the body 2 of the lock also comprises a second elastic element 8a, preferably a spring, mounted inside the slot 8 and associated with the counterbolt 9.

Advantageously, the second elastic element 8a is configured to:

- keeping the counterbolt 9 disposed at least partially inside the insertion channel 3a when the elongated body 11 is withdrawn from the insertion channel 3a,

- allow the counterbolt 9 to retract inside the second cavity 6 when the elongated body 11 is pushed into the insertion channel 3a against the first bolt 5, and

- allow the counterpin 9 to retract in such a way that it is completely disposed inside the slot 8 when the second pin 7 engages with the spherical element 13.

In the embodiment shown in Figures 3 and 4, therefore:

- the second elastic element 8a is at rest when the elongated body 11 is not inserted in the insertion channel 3a, or it is inserted, but has not yet intercepted the section of the cylinder 3 where the pins 5, 7 are arranged (Figure 3), and the second bolt 7 protrudes into the insertion channel 3a,

- the second elastic element 8a undergoes a first shortening when the second bolt 7 is intercepted by the second face 11b of the elongated body 11, while the latter is inserted into the insertion channel 3a, thus translating the second bolt 7 inside the second cavity 6 outside the insertion channel 3a, and

- the second elastic element 8 undergoes a further shortening when the spherical element 13 partially withdrawn from the casing 14 through the second opening 15b, pushed by the first bolt 5, engages with the second bolt 7 moving it away from the insertion channel 3a and pushing it (preferably completely) into the second cavity 6, so that the counterbolt 9 is fully inserted into the slot 8.

Advantageously, therefore, the key 10 and the lock 1 according to the present invention make it possible to provide an effective and secure security system 100 that prevents the unlocking of the lock 1 with unauthorized cloned keys 10 .

The presence of the spherical element 13 that is free to move inside the casing 14 of the key allows the system of bolts 5, 7 and counterbolt 9 to move in a unique and unrepeatable way to provide safe access.

The present invention achieves the intended objects, overcoming the drawbacks of the prior art and providing a security system 100, a lock 1 and a key 10, which are innovative and allow to improve security conditions against unauthorized access.

Claims (9)

1. A security system (100) comprising a lock (1) and an operating key (10) to operate said lock (1), wherein said lock (1) comprises a lock body (2) and a cylinder (3), wherein said lock body (2) has an entrance (2a) within which said cylinder (3) is mounted so rotatable, said cylinder (3) has an insertion channel (3a) for inserting the drive key (10); wherein said cylinder (3) has a first cavity (4) leading to said insertion channel (3a); a first movable pin (5), which is movable toward and away from said insertion channel (3a) while being slidably mounted inside said first cavity (4); wherein said cylinder (3) has a second cavity (6) that leads, on a first side, towards said insertion channel (3a), and on a second side opposite to the first, towards the body (2) of the lock; a second movable bolt (7), which is movable towards and away from said insertion channel (3a), being slidably mounted within said second cavity (6); wherein said lock body (2) has a slot (8) leading to said entrance (2a); a counterbolt (9) being slidably mounted inside said slot (8), said counterbolt (9) being designed to cooperate with said second bolt (7) in a neutral position of the cylinder (3) in which said second cavity (6) of the cylinder (3) is aligned with the groove (8) of the body (2) of the lock, said counterbolt (9) being configured to be arranged at least partially inside said second cavity (6) when the cylinder (3) is in the neutral position, in order to prevent the rotation of the cylinder (3); wherein said drive key (10) comprises an elongated body (11) insertable in said insertion channel (3a), wherein a spherical element (13), which has a diameter (D) and is mobile along a direction (X) of movement that is transverse to a direction (Y) of main extension of the body (11) of elongated shape , is mounted on said elongated body (11), wherein said first and said second bolt (5, 7) are configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in the neutral position, and wherein said spherical element (13) is configured to engage with said first and second pin (5, 7) in order to arrange them at a second distance (H) that is greater than the first distance (h) and equal to the diameter (D) when the elongated body (11) is inserted into the insertion channel (3a), in such a way that the counterpin (9) moves completely in the slot (8) and the cylinder (3) is free to turn inside the body (2) of the lock; characterized in that said cylinder (3) comprises a first elastic element (4a) mounted inside said first cavity (4) and associated with said first bolt (5), said first elastic element (4a) being configured to: - maintain the first bolt (5) at least partially arranged inside the insertion channel (3a) when the elongated body (11) is withdrawn from the insertion channel (3a), - allow the first bolt (5) to retract inside the first cavity (4) when the elongated body (11) is pushed towards the insertion channel (3a) against the first bolt (5), and - allowing the first bolt (5) to move towards the insertion channel (3a) when the first bolt (5) engages with the spherical element (13). The security system (100) according to claim 1, wherein said lock body (2) comprises a second elastic element (8a) mounted inside said slot (8) and associated with said counterbolt (9 ), said second elastic element (8a) being configured for: - keeping the counterbolt (9) at least partially disposed inside the insertion channel (3a) when the elongated body (11) is withdrawn from the insertion channel (3a), - allow the counterbolt (9) to retract inside the second cavity (6) when the elongated body (11) is pushed towards the insertion channel (3a) against the first bolt (5), and - allow the counterbolt (9) to retract in such a way that it is completely disposed inside the groove (8) when the second bolt (7) engages with the spherical element (13). The security system (100) according to claim 1 or 2, wherein said first and said second bolt (5, 7) are movable along respective parallel axes (5a, 7a) of movement. The security system (100) according to claim 3, wherein said second bolt (7) comprises a first portion (7a') configured to engage with the spherical element (13) and extending along a respective extension axis that is coincident with the axis (5a) of movement of the first bolt (5), and a second portion (7") configured to engage with the counterbolt (9) and that extends along a respective extension axis that is eccentric with respect to the axis (5a) of movement of the first bolt (5). The security system (100) according to one or more of the previous claims, wherein said spherical element (13) is inserted inside a casing (14) of the body (11) of elongated shape leading to the opposite faces (11a, 11b) of said elongated body (11) in respective openings (15a, 15b) shaped to prevent the spherical element (13) from completely coming out of said casing (14); being said element (13) spherical free to slide inside said casing (14) along the direction of movement (X), between a first operative position, in which the spherical element (13) obstructs a first opening (15a) of said openings (15a, 15b) when partially protruding from a first face (11a) of said faces (11a, 11b), and a second position, in which the spherical element (13) obstructs a second opening (15b) of said openings (15a , 15b) by partially protruding from a second face (11b) of said faces (11a, 11b). 6. A lock (1) comprising: - a cylinder (3) having an insertion channel (3a) for the insertion of an operating key (10), - a lock body (2) having an entrance (2a) inside which said cylinder (3) is rotatably mounted; wherein said cylinder (3) has a first cavity (4) leading to said insertion channel (3a); a first movable pin (5), which is movable toward and away from said insertion channel (3a), being slidably mounted within said first cavity (4); and wherein said cylinder (3) has a second cavity (6) that leads, on a first side, into said insertion channel (3a), and on a second side opposite the first, towards the lock body (2); a second movable bolt (7), which is movable towards and away from said insertion channel (3a), being slidably mounted within said second cavity (6); wherein said lock body (2) has a slot (8) leading to said entrance (2a); a counterbolt (9) being slidably mounted within said slot (8), said counterbolt (9) being designed to cooperate with said second bolt (7) in a neutral position of the cylinder (3) in which said second cavity ( 6) of the cylinder (3) is aligned with the groove (8) of the lock body (2), said counterbolt (9) being configured to be disposed at least partially inside said second cavity (6) when the cylinder (3) it is in the neutral position, to avoid the rotation of the cylinder (3); said lock (1) is arranged to be actuated by an operating key (10) comprising an elongated body (11) insertable in said insertion channel (3a), where a spherical element (13), having a diameter (D) and is movable along a direction (X) of movement that is transverse to a direction (Y) of main extension of the body (11) of elongated shape, is mounted on said body (11) of elongated shape ; said first and said second pin (5, 7) being configured to be arranged at a first distance (h) when the elongated body (11) is withdrawn from the insertion channel (3a) and the cylinder (3) is in position said first and said second pin (5, 7) being engaged with said spherical element (13) so as to be arranged at a second distance (H) that is greater than the first distance (h) and equal to the diameter (D) when the elongated body (11) is inserted into the insertion channel (3a), in such a way that the counterpin (9) can move completely inside the slot (8) and the cylinder (3) is free to rotate inside of the lock body (2); characterized in that said cylinder (3) comprises a first elastic element (4a) mounted within said first cavity (4) and associated with said first bolt (5), said first elastic element (4a) being configured to: - keeping the first bolt (5) at least partially disposed inside the insertion channel (3a) when the elongated body (11) is withdrawn from the insertion channel (3a), - allow the first bolt (5) to retract inside the first cavity (4) when the elongated body (11) is pushed towards the insertion channel (3a) against the first bolt (5), and - allowing the first bolt (5) to move towards the insertion channel (3a) when the first bolt (5) engages with the spherical element (13). The lock (1) according to claim 6, wherein said lock body (2) comprises a second elastic element (8a) mounted inside said groove (8) and associated with said counterbolt (9), said lock being second elastic element (8a) configured for: - keeping the counterbolt (9) at least partially disposed inside the insertion channel (3a) when the elongated body (11) is withdrawn from the insertion channel (3a), - allow the counterbolt (9) to retract inside the second cavity (6) when the elongated body (11) is pushed in the insertion channel (3a) against the first bolt (5), and - allow the counterbolt (9) to retract in such a way that it is completely disposed within the slot (8) when the second bolt (7) engages with the spherical element (13). The lock (1) according to one or more of claims 7, wherein said first and said second bolt (5, 7) are movable along respective parallel axes (5a, 7a) of movement. The lock (1) according to claim 8, wherein said second bolt (7) comprises: - a first hooking portion (7') configured to engage with the spherical element (13) and which extends along a respective axis of extension, which is coincident with the axis (5a) of movement of the first bolt (5 ), and - a second hooking portion (7") configured to engage with the counterpin (9) and which extends along a respective axis of extension, which is coincident with an axis (9a) of movement of the counterpin ( 9) and eccentric with respect to the axis (5a) of movement of the first bolt (5).