Protective cord and locking device with the protective cord

Abstract

Protective cord, characterized in that it comprises an inner core (901) and a covering (902) arranged around the inner core (901), wherein the covering (902) comprises two protective layers made of two different materials, each of the protective layers being a woven, braided or laid fabric of fibers, yarns or metal wires, wherein the woven or braided fabrics of the two protective layers are arranged in superimposed layers.

Description

Technical field

[0001] The present utility model relates to the technical field of the locking device, in particular a protective cord and a locking device with the protective cord. State of the art

[0002] Commercially available chain or cable locks expose both the chain and the steel cable, making them susceptible to corrosion and forced entry. Therefore, a protective cord is necessary to shield the chain or steel cable. Furthermore, on November 25, 2025, the applicant filed a patent application, patent number 2025224991921, entitled "Locking device with a simple structure and a light locking mechanism." In this lock, the locking pin lacks a limiting structure in the insertion direction of the movable head. Consequently, as the head rotates, the locking pin moves to the side. This movement causes friction between the locking pin and the inner wall of the lock body, potentially leading to jamming. Such jamming prevents the locking pin from returning to its initial position.Furthermore, contact between the inner wall of the locking pin of the locking device and the rotating part is established via the flat surface of the inner wall of the locking pin and the outer edge of the rotating part. During operation, we observed that when the key is turned, the furthest point of the rotating part tends to press against the locking pin, causing it to jam. As a result, the key cannot return to its starting position, and the locking pin cannot engage. Content of the utility model

[0003] To solve the technical problems raised in the prior art, the present utility model primarily provides a protective cord for protecting chains or steel cables.

[0004] To achieve the aforementioned purpose, the present utility model offers the following technical solutions: A protective cord comprising an inner core and a covering arranged around the inner core, wherein the covering comprises two protective layers made of two different materials, each of the protective layers being a woven, braided or laid fabric of fibers, yarns or metal wires, the woven or braided fabrics of the two protective layers being arranged in superimposed layers.

[0005] Preferably, the fibers or yarns used to manufacture the woven, braided and / or laid fabric are selected from: synthetic fibers and / or natural fibers or yarns made of synthetic fibers and / or natural fibers.

[0006] Preferably the inner core is a chain, wherein the chain is made of metal or composite material, the chain is a link chain and the chain thickness is any value from 3 mm to 9 mm, wherein the chain is sheathed by composite filaments or yarns or twisted threads.

[0007] Preferably, the chemical fibers consist of fibers made of synthetic polymers, polyester fibers, fibers made of inorganic materials and metal fibers, wherein the fibers made of inorganic materials are carbon fibers, glass fibers, boron fibers, quartz fibers, nanotube fibers, ceramic fibers, basalt fibers and slag fibers.

[0008] Preferably, the fibers produced from synthetic polymers are selected from fibers made from the following materials: ultra-high molecular weight polyethylene, polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, polypropylene, polyamide, trivinyl, polyimide, elastic polyester fiber, polybenzimidazole, polyphenylene sulfide, polyurea, vinyl, polyamide-imide, polychlorinated compounds, aramid, elastic polyolefin, polyacrylate, polytetrafluoroethylene, polyethylene, polybenzoxazole, polystyrene and polycarbonate, wherein the fibers produced from natural polymers are selected from: fibers made from regenerated cellulose; fibers made from cellulose esters; protein fibers; polylactic acid fibers, bio-based polyamide fibers and elastic diene fibers.

[0009] Preferably, the woven, braided and / or laid fabric contains a mixture or combination of fibers or yarns.

[0010] Preferably, the metal wire used to produce the woven, braided and / or laid fabric contains a metal wire, a metal foil or a metal coating of a textile fiber.

[0011] A locking device with a aforementioned protective cord, comprising a lock body, a movable head, wherein the lock body comprises a housing assembly and a locking cylinder, wherein the protective cord comprises a fixed head and a movable head at both ends, the fixed head of the protective cord is attached to the housing assembly of the lock body, while the movable head of the protective cord can be movably inserted into the lock body, and the movable head has a locking slot, wherein the lock body further comprises a mounting base, at least one locking pin is movably arranged on the mounting base, the locking pin has a locking section which can engage in the locking slot in the locked state, the output end of the locking cylinder is transmissionally connected to a rotating part, and the locking pin is directly pressed by the rotation of the rotating part.wherein the locking section of the locking pin disengages from the locking slot of the movable head in order to release the locking mechanism, characterized in that a limiting device is provided between the locking pin and the mounting base to limit the movement of the locking pin to the side of the movable head.

[0012] Preferably, the limiting device comprises locking columns extending outwards from both sides of the locking pin, with corresponding recesses provided on the mounting base into which the locking columns of the locking pin can engage, the inner wall of the recess limiting the movement of the locking column towards the side of the movable head.

[0013] Preferably, the contact surface between the locking pin and the rotating part is provided with a first guide chamfer, and when the rotating part rotates into its furthest position and rests against the locking pin, the rotating part then rests against the first guide chamfer of the locking pin.

[0014] Preferably, the lock body comprises an outer housing, an outer sleeve, an inner shell, and a core sleeve arranged sequentially from the outside in, wherein the core sleeve fits over the lock cylinder and the outer surface of the core sleeve has a locking bore for inserting the end of the fixed head, while the inner shell has a detent section for engaging the fixed head, the inner shell and the core sleeve limit axial movement of the inner shell by means of a radial pin, an axial pin is arranged between the inner shell and the mounting base, part of the axial pin is inserted into the inner shell, part of the axial pin is located in the mounting base, and an adjusting screw is screwed onto the mounting base or the outer sleeve at the rear end of the axial pin.

[0015] Advantageous effects of the present utility model: The protective cord of the present utility model comprises two protective layers arranged on the outside of the chain, thus effectively preventing violent manipulation. This includes, for example, sawing or cutting with cable cutters, cutting machines, or diamond tools; cutting with sharp blades; tearing; or thermal effects (e.g., from fire, gas burners, etc.) or exposure to cold, whereby intensive local subcooling with a refrigerant (e.g., liquid helium, liquid nitrogen, or liquid oxygen) makes conventional materials such as steel brittle and susceptible to breakage from hammer blows. Illustration of the attached figures Fig. Figure 1 is a schematic representation of the overall structure of the present utility model; Fig. Figure 2 is a sectional view of the present utility model; Fig. Figure 3 is a schematic representation of the structure of the turned part of the present utility model; Fig. Figure 4 is a schematic representation of the structure of the locking pin of the present utility model; Fig. Figure 5 is a schematic representation of the structure of the locking pin of the present utility model from a different perspective; Fig. Figure 6 is a schematic representation of the structure of the elastic part of the present utility model; Fig. Figure 7 schematically illustrates the connection structure between the mounting base and the locking pin of the present utility model; Fig. Figure 8 is a schematic representation of the structure of the mounting base of the present utility model; Fig. Figure 9 is a schematic representation of the structure of the first torsion spring of the present utility model; Fig. Figure 10 shows a schematic representation of the structure of the present utility model, with the outer casing and outer sleeve removed; Fig. Figure 11 is a schematic representation of the structure of the inner shell of the present utility model; Fig. Figure 12 is a schematic representation of the structure of the protective cord of the present utility model.

[0016] Reference numeral list: 1. Lock body; 2. Housing assembly; 201. Outer housing; 202. Outer sleeve; 203. Inner shell; 2031. Detent section; 204. Core sleeve; 2041. Locking bore; 205. Radial pin; 206. Axial pin; 207. Adjusting screw; 3. Lock cylinder; 301. Transmission section; 4. Mounting base; 401. Detent groove; 402. Mounting slot; 403. Mounting space; 404. Slot opening; 405. Crossbar; 406. Recess; 5. Locking pin; 501. Locking section; 502. Mounting slot; 503. Second guide chamfer; 504. Cylinder body; 505. Lower rib; 506. Locking post; 507. First guide chamfer; 6. Turned part; 7. First torsion spring; 8. Elastic part; 9.

[0017] Protective cord; 901. Inner core; 902. Cover; 903. Fixed head; 904. Movable head; 9041. Locking slot. Detailed descriptions

[0018] The technical solutions in the embodiments of this utility model are clearly and completely described below in conjunction with the accompanying drawings. Naturally, the described embodiments represent only a portion of the embodiments of this utility model and do not constitute all of them. Based on the exemplary embodiments in this utility model, all other exemplary embodiments that a person skilled in the art would obtain without any creative effort fall within the scope of protection of this utility model. Example of implementation

[0019] In the Fig. 1 to Fig.Figure 12 shows a locking device comprising a lock body 1 and a protective cord. The lock body 1 comprises a housing assembly 2 and a locking cylinder 3. The protective cord 9 has a fixed head 903 and a movable head 904 at each end. The fixed head 903 of the protective cord is attached to the housing assembly of the lock body, while the movable head 904 of the protective cord can be movably inserted into the lock body 1. It should be noted that the protective cord 9 comprises an inner core 901 and a covering 902 arranged around the inner core 901, the covering 902 comprising two protective layers made of two different materials, each of the protective layers being a woven, braided, or laid fabric of fibers, yarns, or metal wires, the woven or braided fabrics of the two protective layers being arranged in superimposed layers.The inner core in this embodiment is a chain, wherein the chain is made of metal or composite material, the chain is a lock chain, and the chain thickness is any value from 3 mm to 9 mm. The movable head 904 in this embodiment has a locking slot 9041, wherein the lock body 1 further comprises a mounting base 4, at least one locking pin 5 is movably arranged on the mounting base 4, the locking pin 5 has a locking section 501 which, in the locked state, can engage in the locking slot 9041, the output end of the lock cylinder 3 is transmissionally connected to a rotating part 6, and by rotating the rotating part 6, the locking pin 5 is directly pressed, thereby releasing the locking section 501 of the locking pin from the locking slot 9041 of the movable head 904 in order to release the lock.In this embodiment, it is further noteworthy that a limiting device is provided between the locking pin 5 and the mounting base 4 to limit the movement of the locking pin 5 towards the side of the movable head 904. The limiting device comprises locking columns 506 that extend outwards from both sides of the locking pin 5, with corresponding recesses 406 provided on the mounting base 4 into which the locking columns 506 of the locking pin can engage, the inner wall of the recess 406 limiting the movement of the locking column 506 towards the side of the movable head 904. The configuration of the recess and the locking column limits the range of motion of the locking pin and thus prevents jamming caused by friction between the locking pin and the housing assembly of the lock body during rotation.This ensures that the key can return to its starting position.

[0020] It should be noted that the contact surface between the locking pin 5 and the rotating part 6 is provided with a first guide chamfer 507. When the rotating part 6 rotates to its furthest position and rests against the locking pin 5, the rotating part 6 rests against the first guide chamfer 507 of the locking pin 5. The arrangement of the chamfer on the contact surface between the locking pin 5 and the rotating part 6 ensures that no blockage occurs when the rotating part rests against the locking pin in its furthest position. This also ensures the smooth return of the key to its starting position, thus improving ease of use.

[0021] In this embodiment, it is further noteworthy that the housing arrangement 2 comprises an outer housing 201, an outer sleeve 202, an inner shell 203, and a core sleeve 204, which are arranged sequentially from the outside to the inside, wherein the core sleeve 204 fits over the locking cylinder 3 and the outer surface of the core sleeve 204 has a locking bore 2041 for inserting the end of the fixed head 903, while the inner shell 203 has a detent section 2031 for engaging the fixed head, the inner shell 203 and the core sleeve 204 limit axial movement of the inner shell 203 by means of a radial pin 205, an axial pin 206 is arranged between the inner shell 203 and the mounting base 4, and a portion of the axial pin 206 is inserted into the inner shell 203.Part of the axial pin 206 is located in the mounting base 4, and an adjusting screw 207 is screwed to the mounting base 4 or the outer sleeve 202 at the rear end of the axial pin 206. This technology overcomes the limitation of the prior art, where the outer sleeve and inner shell are directly attached via pins, making subsequent disassembly for repair impossible. In this embodiment, the outer sleeve and inner shell are connected to each other via an axial pin, with a removable adjusting screw located at the rear end of the axial pin. If disassembly is required, the axial pin can be pulled out by removing the adjusting screw, thus separating the entire housing assembly for internal repair work. Once the movable head of the protective cord is engaged, it covers the adjusting screw, preventing unauthorized removal.

[0022] In this exemplary embodiment, the fibers or yarns used to produce the woven, braided, and / or laid fabric are selected from: man-made fibers and / or natural fibers, or yarns made of man-made fibers and / or natural fibers. The inner core 901 is a warp, wherein the warp is made of metal or composite material, the warp is a link chain, and the warp thickness is any value from 3 mm to 9 mm, wherein the warp is sheathed by composite filaments or yarns or twisted threads. The man-made fibers consist of fibers made of synthetic polymers, polyester fibers, fibers made of inorganic materials, and metal fibers, wherein the fibers made of inorganic materials are carbon fibers, glass fibers, boron fibers, quartz fibers, nanotube fibers, ceramic fibers, basalt fibers, and slag fibers.The fibers produced from synthetic polymers are selected from fibers made from the following materials: ultra-high molecular weight polyethylene, polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, polypropylene, polyamide, trivinyl, polyimide, elastic polyester fiber, polybenzimidazole, polyphenylene sulfide, polyurea, vinyl, polyamide-imide, polychlorinated compounds, aramid, elastic polyolefin, polyacrylate, polytetrafluoroethylene, polyethylene, polybenzoxazole, polystyrene, and polycarbonate. The fibers produced from natural polymers are selected from: regenerated cellulose fibers; cellulose ester fibers; protein fibers; polylactic acid fibers; bio-based polyamide fibers; and elastic diene fibers. The woven, braided, and / or laid fabric contains a mixture or combination of these fibers or yarns.The metal wire used to manufacture the woven, braided, and / or laid fabric contains a metal wire, a metal foil, or a metal coating of a textile fiber. The sheath 902 around the protective cord not only provides effective protection for the inner core but also reduces impact forces. It offers multiple layers of protection against forced tampering. Without this sheath, the protective cord could be damaged, for example, by forcibly cutting the inner core. However, the sheath used in the present application possesses exceptional toughness, making it cut-resistant.

[0023] This embodiment features two symmetrically arranged locking pins. The locking pin 5 comprises a locking section 501, which is designed to engage in the locking slot 9041 when locked. The output end of the locking cylinder 3 is connected to a rotating part 6. The rotation of the rotating part 6 presses directly on the locking pin 5, causing the locking section 501 of the locking pin 5 to disengage from the locking slot 9041 of the movable head 904, thereby releasing the lock. In this embodiment, the mounting base 4 has a hollow structure in its center in which the rotating part 6 is arranged to allow free rotation. The rotation of the rotating part 6 is enabled by turning the locking cylinder 3 with a key.The transmission between the two is facilitated in particular by a non-circular transmission section 301, which is arranged at the end of the locking cylinder 3, with the rotating part 6 fitting directly over this transmission section 301. Two locking pins 5 are arranged on the mounting base 4 on both sides of the rotating part 6. When the rotating part 6 rotates, its outer wall presses against the locking pin 5, causing both locking pins 5 to open. This movement releases the locking section 501 of each of the two locking pins 5 from the locking slot 9041. At this point, the movable head 904 can be freely pulled out. To enable automatic resetting of the locking cylinder 3, this embodiment includes a first torsion spring 7 between the rotating part 6 and the mounting base 4.One end of the first torsion spring 7 is inserted into the rotating part 6, the rotating part 6 having a socket for receiving this end of the first torsion spring 7. The other end of the first torsion spring 7 engages with the mounting base 4, the mounting base 4 having a locking groove 401 for receiving the end of the first torsion spring 7 to facilitate easy insertion of the end of the first torsion spring 7 into the locking groove 401 on the mounting base 4. This embodiment includes an installation slot 402 on the locking groove 401 of the mounting base 4. This installation slot 402 connects the space in the mounting base 4 for installing the first torsion spring 7 to the outside of the mounting base 4, thereby facilitating the installation of the first torsion spring 7.

[0024] To enable rapid resetting of the locking pin 5, this embodiment further includes an elastic element 8 that elastically returns the locking pin 5 to the locked position. The elastic element 8 described in this embodiment is a second torsion spring. One end of the second torsion spring rests against the locking pin 5, while the other end rests against the inner wall of the lock body 1. The mounting base 4 has a mounting space 403 designed to partially accommodate the main body of the second torsion spring. In this embodiment, the resetting elastic element 8 of the locking pin 5 is designed as the second torsion spring, which is arranged on its rear side. By incorporating a mounting slot 502 on the rear side to secure the second torsion spring, the second torsion spring is firmly fixed, thus preventing displacement of the second torsion spring.In contrast, conventional straight springs tend to deform when stretched and can come loose from their mounting position. The second torsion spring in this embodiment completely prevents such occurrences and thus further ensures the product's service life.

[0025] In this embodiment, the rotating part 6 is provided with both a narrow section and a wide section so that it can intermittently drive the locking pin 5. When the rotating part 6 rotates so that its wide section faces the locking pin 5, it pushes the locking pin 5 and causes it to rotate. The locking section 501 of the locking pin 5 disengages from the locking slot 9041 to release the lock. When the rotating part 6 rotates toward the narrow section, the locking pin 5 is returned to its locked initial position by the action of the second torsion spring. The rotating part 6 has an elliptical or raceway-shaped cross-section. This embodiment uses an elliptical design.When both ends of the elliptical rotating part 6 bear against the locking pin 5 in the longitudinal direction, the rotational movement of the locking pin 5 is restricted by the mounting base 4 and the lock body 1, so that only one rotational movement is possible. When the rotating part 6 pushes against this, one end of the locking section 501 of the locking pin 5 moves away from the locking slot 9041 of the movable head 904, thereby releasing the lock. When both ends of the elliptical rotating part 6 bear against the locking pin 5 in the transverse direction, the rotational movement of the locking pin 5 is also restricted. The rotating part 6 is reset by the action of the second torsion spring. In this embodiment, this prevents the rotating part 6 from disengaging from the lock cylinder 3.

[0026] To enable keyless locking in this embodiment, a second guide chamfer 503 is provided at the end of the locking pin 5, facing the movable head 904. When the movable head 904 is inserted, it pushes the locking pin 5 over the second guide chamfer 503. To further facilitate insertion of the movable head 904, a tapered section is formed laterally at its end, allowing it to more easily push the locking pin 5.

[0027] In this embodiment, the mounting base 4 and the core sleeve of the locking cylinder 3 form a single, integrated structure. This design facilitates quick assembly of the locking device and reduces costs. The one-piece construction eliminates the need for separate fastening of the mounting base 4, while simultaneously increasing structural strength.

[0028] To facilitate improved rotation between the locking pin 5 and the mounting base 4 and to reduce jamming, this embodiment features a smooth cylinder body 504 at the rotational interface between the locking pin 5 and the mounting base 4. The corresponding mounting base 4 has a smooth, curved surface. Since all rotating components have smooth surfaces, this design significantly minimizes obstructions, even if dust enters the space between the locking pin 5 and the mounting base 4. Consequently, the force required to turn the key is further reduced, and jamming during prolonged use is prevented, thus extending the service life.

[0029] In this embodiment, a slot opening 404 is provided on the mounting base 4 to allow the locking pin 5 to rotate. To prevent excessive rotation, which would prevent the movable head 904 from pushing the locking pin 5 into position, a crossbar 405 is provided at the slot opening 404 in this embodiment to prevent excessive insertion of the locking pin 5. This crossbar 405 ensures that, when both locking pins 5 are in the locked position, a suitable opening is maintained so that the movable head 904 can easily push the locking pin 5 into position.

[0030] To ensure that the locking pin 5 more securely secures the movable head 904, this embodiment features a downwardly projecting lower rib 505 on the contact surface between the locking section 501 of the locking pin and the movable head, or designs this contact surface as a hook-shaped structure with a downwardly inclined end. The corresponding locking slot 9041 of the movable head 904 has a conical surface 202 with an inner concave and an outer convex profile that engages in the lower rib 505. Thus, the lower rib of the locking pin engages securely in the locking slot of the movable head. Once the movable head is inserted and locked, it is difficult to remove.

[0031] The present utility model provides a protective cord and a locking device, wherein the protective cord comprises an inner core and a covering arranged around the inner core, the covering comprising two protective layers made of two different materials, each of the protective layers being a woven, braided, or laid fabric of fibers, yarns, or metal wires, the woven or braided fabrics of the two protective layers being arranged in superimposed layers. The locking device comprises a lock body, a movable head, the lock body comprising a housing assembly and a locking cylinder, the protective cord comprising a fixed head and a movable head at each end, the movable head having a locking slot, the lock body further comprising a mounting base, and at least one locking pin being movably arranged on the mounting base.The locking pin has a locking section which, in the locked state, engages in the locking slot. The output end of the lock cylinder is connected to a rotating part by means of a transmission mechanism. Rotating the rotating part directly presses the locking pin, thereby releasing the locking section of the locking pin from the locking slot of the movable head to disengage the lock. A limiting device is provided between the locking pin and the mounting base to restrict the movement of the locking pin towards the side of the movable head. The protective cord of this utility model comprises two protective layers arranged on the outside of the chain, thus effectively preventing forced tampering.

Claims

[1] Protective cord, characterized by , that it comprises an inner core (901) and a covering (902) arranged around the inner core (901), wherein the covering (902) comprises two protective layers made of two different materials, each of the protective layers being a woven, braided or laid fabric of fibers, yarns or metal wires, wherein the woven or braided fabrics of the two protective layers are arranged in superimposed layers. [2] Protective cord according to claim 1, characterized by , that the fibers or yarns used to manufacture the woven, braided and / or laid fabric are selected from: synthetic fibers and / or natural fibers or yarns made from synthetic fibers and / or natural fibers. [3] Protective cord according to claim 1, characterized by, that the inner core (901) is a chain, wherein the chain is made of metal or composite material, the chain is a lock chain and the chain thickness is any value from 3 mm to 9 mm, wherein the chain is sheathed by composite filaments or yarns or twisted threads. [4] Protective cord according to claim 2, characterized by , that the chemical fibers consist of fibers made of synthetic polymers, polyester fibers, fibers made of inorganic materials and metal fibers, wherein the fibers made of inorganic materials are carbon fibers, glass fibers, boron fibers, quartz fibers, nanotube fibers, ceramic fibers, basalt fibers and slag fibers. [5] Protective cord according to claim 4, characterized bythat the fibers produced from synthetic polymers are selected from fibers made from the following materials: ultra-high molecular weight polyethylene, polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate, polypropylene, polyamide, trivinyl, polyimide, elastic polyester fiber, polybenzimidazole, polyphenylene sulfide, polyurea, vinyl, polyamide-imide, polychlorinated compounds, aramid, elastic polyolefin, polyacrylate, polytetrafluoroethylene, polyethylene, polybenzoxazole, polystyrene and polycarbonate, wherein the fibers produced from natural polymers are selected from: regenerated cellulose fibers; cellulose ester fibers; protein fibers; polylactic acid fibers, bio-based polyamide fibers and elastic diene fibers. [6] Protective cord according to claim 2, characterized by that the woven, braided and / or laid fabric contains a mixture or combination of fibers or yarns. [7] Protective cord according to claim 6, characterized by , that the metal wire used to manufacture the woven, braided and / or laid fabric contains a metal wire, a metal foil or a metal coating of a textile fiber. [8] Locking device with a protective cord according to any one of claims 1 to 7, comprising a lock body (1), a movable head (904), wherein the lock body (1) comprises a housing arrangement (2) and a locking cylinder (3), wherein the protective cord (9) comprises a fixed head (903) and a movable head (904) at both ends, the fixed head (903) of the protective cord being attached to the housing arrangement (2) of the lock body (1), while the movable head (904) of the protective cord being movably insertable into the lock body (1), and the movable head (904) having a locking slot (9041), wherein the lock body (1) further comprises a mounting base (4), at least one locking pin (5) being movably arranged on the mounting base (4), the locking pin (5) having a locking section (501) which, in the locked state, engages in the locking slot (9041) is able to intervenethe output end of the lock cylinder (3) is connected to a rotating part (6) by means of a transmission mechanism and the locking pin (5) is directly pressed by the rotation of the rotating part (6), thereby releasing the locking section (501) of the locking pin (5) from the locking slot (9041) of the movable head in order to release the lock, . characterized by , that a limiting device is provided between the locking pin (5) and the mounting base (4) to limit the movement of the locking pin (5) to the side of the movable head (904). [9] Locking device according to claim 8, characterized by, that the limiting device comprises locking columns (506) extending outwards from both sides of the locking pin (5), wherein corresponding recesses (406) are provided on the mounting base (4) into which the locking columns (506) of the locking pin (5) can engage, wherein the inner wall of the recess (406) limits the movement of the locking column (506) towards the side of the movable head (904). [10] Locking device according to claim 8, characterized by , that the contact surface between the locking pin (5) and the rotating part (6) is provided with a first guide chamfer (507), and when the rotating part (6) rotates to its furthest position and rests against the locking pin (5), the rotating part (6) rests against the first guide chamfer (507) of the locking pin (5). [11] Locking device according to claim 8, characterized by, that the lock body (1) comprises an outer housing (201), an outer sleeve (202), an inner shell (203) and a core sleeve (204) arranged sequentially from the outside in, the core sleeve (204) fitting over the lock cylinder (3) and the outer surface of the core sleeve (204) having a locking bore (2041) for inserting the end of the fixed head (903), while the inner shell (203) having a detent section (2031) for engaging the fixed head (903), the inner shell (203) and the core sleeve (204) limiting axial movement of the inner shell (203) by a radial pin (205), an axial pin (206) being arranged between the inner shell (203) and the mounting base (4), a portion of the axial pin (206) being inserted into the inner sleeve (203),a part of the axial pin (206) is located in the mounting base (4) and an adjusting screw (207) is screwed onto the mounting base (4) or the outer sleeve (202) at the rear end of the axial pin (206).

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