A rectangular connector with a combined quick lock structure

Abstract

The present invention discloses a rectangular connector with a combined quick-lock structure, which belongs to the field of connector technology and includes a rectangular connector body and a switching locking member. The rectangular connector body is composed of a connecting female seat and an assembly plug end, and the connecting female seat includes a female seat shell plate, an assembly seat, and a protective end plate connected to the assembly seat. The present invention designs the switching locking member. In the dynamic buffering mode, only the positioning claw with an energy-absorbing buffer at the front end is used for locking. The energy-absorbing spring allows the locking column to slide elastically in the positioning lock seat, which can effectively absorb the vibration energy generated by rail transit, prevent the connection from loosening, and protect the pin connection. In the fixed connection mode, both positioning claws are inserted into the positioning lock seat to form a rigid fastening connection, providing maximum connection strength and stability. The connection mode can be flexibly switched according to the application location (vibration intensity) and requirements (buffering or fastening) without replacing parts, which greatly improves the adaptability and reliability of the connector.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors, and in particular to a rectangular connector with a combined quick-lock structure. Background Art

[0002] A board-to-board rectangular connector is a common electronic interconnect component, typically consisting of two mating parts (a plug and a socket). The plug is equipped with a terminal block, which is the core conductive component of the connector and is responsible for establishing an electrical connection between the plug and the socket. Pin-type terminals are a commonly used wiring structure that works with the socket to achieve signal connection. However, pin-type terminals are prone to bending when pressed or collided. This requires adjusting the angle of the pin to ensure it can be inserted when re-inserting, which makes the pin-type terminals inconvenient to use.

[0003] Moreover, in the field of rail transit, board-to-board rectangular connectors used for signal transmission are mainly locked by a snap-on structure or a bolt-on structure. The structural connection strength of the snap-on structure is insufficient and cannot be adjusted according to the application position and mode requirements. Although the design of the bolt-on structure can adjust the connection strength, it requires tools to operate, and the bolts are prone to the hidden danger of the nut falling off due to the vibration generated by rail running. Based on this, a rectangular connector with a combined quick-lock structure is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a rectangular connector with a combined quick-lock structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A rectangular connector with a combined quick-lock structure, comprising a rectangular connector body and a switching locking member. The rectangular connector body is composed of a connecting female base and an assembly plug end. The connecting female base comprises a female base shell plate, an assembly base, and a protective end plate connected to the assembly base. The connecting female base is provided with plug pins, and the protective end plate is provided with a blocking protective member for storing force to protect the plug pins.

[0007] The assembly plug includes a plug housing and a plug-in terminal seat connected to the plug housing, a socket for a plug pin to perform signal insertion is provided in the plug-in terminal seat, an adapter cover body adapted to the assembly seat is fixedly connected to the side wall of the plug housing, and an active release component for releasing the limit of the blocking protective member is provided on the adapter cover body;

[0008] The switching locking part includes fixed end seats arranged on both sides of the mother seat shell plate, a locking column is provided on the fixed end seat, a limit stop cap is provided on the end of the locking column, two groups of positioning claws are provided on the locking column, the positioning claws at the front end are connected to the locking column through an energy-absorbing buffer, and positioning lock seats are provided on both sides of the plug end shell.

[0009] As a preferred solution, the blocking protective member includes a force storage vertical groove opened on the protective end plate, the inner wall of the force storage vertical groove is connected to a force storage connecting seat through a force storage sliding member, and the force storage connecting seat is connected to an anti-bending rod through a torsion spring shaft.

[0010] As a preferred solution, the force storage vertical groove is arranged on the side wall of the protective end plate between adjacent plug pins, and the adjacent anti-bending rods are staggered to block the horizontal bending of the plug pins.

[0011] As a preferred solution, the force storage sliding member includes sliding openings opened on the side walls on both sides of the force storage vertical groove, and the force storage sliding blocks are fixedly connected to both sides of the force storage connecting seat. The force storage sliding blocks are located in the sliding openings and are connected to the inner wall of the sliding openings through force storage springs.

[0012] As a preferred solution, a plug conductor is provided in the socket, a spring-loaded copper core is provided in the plug conductor, and a conductive ball that is cooperatively connected to the spring-loaded copper core is provided on the plug pin.

[0013] As a preferred solution, the active release component includes an L-shaped locking socket opened on the side wall of the adapter cover, and the end of the anti-folding rod is provided with a card block plug that is compatible with the L-shaped locking socket. A blocking bar is fixedly connected to the adapter cover, and the blocking bar is connected to a release member through a limit spring vertical block. The release member passes through the L-shaped locking socket and contacts the card block plug.

[0014] As a preferred solution, an active frame is slidably provided on the adapting cover, the inner side wall of the active frame is inclined, and an inclined pressure plate is fixedly provided on the side wall of the releasing member.

[0015] As a preferred solution, the energy-absorbing buffer includes a through energy-absorbing port opened on the side wall of the locking column, and the inner wall of the positioning claw at the front end is fixedly connected to an energy-absorbing cross bar, and the energy-absorbing cross bar is located in the through energy-absorbing port and is connected to the inner wall of the through energy-absorbing port through a resisting energy-absorbing spring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention effectively limits the horizontal (left and right) movement of the pins by locating staggered anti-bending rods between adjacent pins, and absorbs energy through the stored force spring when subjected to external force, thereby preventing the pins from bending up and down due to accidental force. During the plugging process, the anti-bending rods will contact the inclined surfaces on both sides of the plug-in terminal before the pins, playing a guiding and positioning role, ensuring that the pins can be accurately and smoothly inserted into the corresponding sockets, simplifying the installation operation, and improving the plugging success rate and efficiency.

[0018] 2. The present invention designs a switching locking piece. In the dynamic buffering mode, only the positioning claw with an energy-absorbing buffer at the front end is used for locking. The energy-absorbing spring allows the locking column to slide elastically in the positioning lock seat, which can effectively absorb the vibration energy generated by rail transit, prevent the connection from loosening, and protect the pin connection. It is more suitable for high-vibration areas; in the fixed connection mode, both positioning claws are inserted into the positioning lock seat to form a rigid fastening connection, providing maximum connection strength and stability. The connection mode can be flexibly switched according to the application location (vibration intensity) and requirements (buffering or fastening) without replacing parts, which greatly improves the adaptability and reliability of the connector.

[0019] 3. The present invention significantly improves the reliability, stability and durability of the connector before, during and after installation through the design of an anti-bend rod, a dual-mode lock and a spring-type copper core structure. It also significantly improves the flexibility of installation and can switch modes according to different locations and application requirements of rail transit (high vibration or rigid fixation), effectively overcoming the many shortcomings of traditional board-to-board rectangular connectors in rail transit applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the assembled structure of a rectangular connector with a combined quick lock structure proposed by the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the assembled structure of a rectangular connector with a combined quick lock structure proposed by the present invention. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the assembled structure of a rectangular connector with a combined quick lock structure proposed by the present invention. Figure 3 ;

[0023] Figure 4 This is a schematic diagram of the connection state structure of a rectangular connector with a combined quick lock structure proposed by the present invention;

[0024] Figure 5 This is a schematic cross-sectional view of a force-storing vertical slot in a rectangular connector with a combined quick-lock structure proposed by the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly structure of a switching locking member in a rectangular connector with a combined quick-lock structure proposed by the present invention;

[0026] Figure 7 This is a schematic diagram of the three-dimensional structure of a switching locking member in a rectangular connector with a combined quick-lock structure proposed by the present invention;

[0027] Figure 8 This is a schematic cross-sectional view of a rectangular connector with a combined quick-lock structure proposed by the present invention;

[0028] Figure 9 for Figure 8 Schematic diagram of the enlarged structure at point A in the middle.

[0029] In the figure: 1. female base shell plate; 2. assembly base; 3. protective end plate; 4. plug-in pin; 5. plug-in end shell; 6. plug-in end seat; 7. adapter cover; 8. fixed end seat; 9. locking column; 10. limit stop cap; 11. positioning spring claw; 12. positioning lock seat; 13. force storage vertical groove; 14. force storage connecting seat; 15. torsion spring shaft; 16. anti-bending rod; 17. sliding mouth; 18. force storage slider; 19. plug-in conductor; 20. spring-type copper core; 21. conductive ball; 22. L-shaped locking socket; 23. card block plug; 24. blocking bar; 25. limit spring vertical block; 26. release member; 27. active frame; 28. inclined pressure plate; 29. ​​through energy absorption port; 30. energy absorption cross bar. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0033] Example, see Figures 1 to 9 A rectangular connector with a combined quick-lock structure includes a rectangular connector body and a switching locking member. The rectangular connector body is composed of a connecting female base and an assembly plug end. The connecting female base includes a female base shell plate 1, an assembly base 2 and a protective end plate 3 connected to the assembly base 2. The connecting female base is provided with a plug pin 4, which passes through the protective end plate 3, the assembly base 2 and the female base shell plate 1. One end of the plug pin is connected to the assembly plug end and the other end is connected to the centralized circuit. The protective end plate 3 is provided with a blocking protective member for storing force on the plug pin 4.

[0034] Furthermore, the blocking protective member includes a force storage vertical groove 13 opened on the protective end plate 3, the inner wall of the force storage vertical groove 13 is connected to the force storage connecting seat 14 through a force storage sliding member, and the force storage connecting seat 14 is connected to the anti-bending rod 16 through a torsion spring shaft 15. The force storage vertical groove 13 is arranged on the side wall of the protective end plate 3 between adjacent plug pins 4, and the adjacent anti-bending rods 16 are staggered, which can achieve blocking of the horizontal bending of the plug pins 4.

[0035] It should be noted that the anti-folding rods 16 are staggered between adjacent plug pins 4 to limit the left and right movement of the plug pins 4. Since the anti-folding rods 16 cannot move left and right, the plug pins 4 limited by them cannot move left and right either. Therefore, it can avoid the plug pins 4 from tilting left and right when subjected to force. The anti-folding rods 16 are connected to the force storage vertical slots 13 through force storage buffers and can slide up and down. The plug pins 4 can be buffered and protected on the left and right sides of the anti-folding rods 16 on both sides. When the plug pins 4 are subjected to deformation force, the anti-folding rods 16 on both sides will be subjected to force first to perform buffering protection, thereby avoiding the plug pins 4 from deforming up and down.

[0036] Furthermore, the force storage sliding member includes a sliding opening 17 opened on the side walls on both sides of the force storage vertical groove 13, and a force storage slider 18 is fixedly connected to both sides of the force storage connecting seat 14. The force storage slider 18 is in the sliding opening 17 and is connected to the inner wall of the sliding opening 17 through a force storage spring. The force storage spring applies resistance to the force storage slider 18, and when the anti-folding rod 16 is pressed, it will produce a buffering and energy absorption effect.

[0037] The advantages of adopting the above structure are different when the rectangular connector body is used in different states, as follows:

[0038] Before installation, when the plug pins 4 are in an exposed state, the anti-bending rods 16 on both sides of the plug pins 4 will protect the plug pins 4 and prevent them from being bent and damaged by external forces;

[0039] During installation, the staggered anti-bending rods 16 are V-shaped with each other, which can contact the inclined surfaces on both sides of the plug-in terminal 6 when the female connector and the assembly plug are connected, guiding the connection, thereby achieving positioning and ensuring that the plug pin 4 can be accurately inserted into the socket and connected to the plug conductor 19;

[0040] After installation, when the rectangular connector body is in the dynamic buffering mode, the multiple anti-folding rods 16 have a telescopic effect and are used in conjunction with the switching locking parts. When the connecting female seat and the assembly plug end are moving, the dynamic potential energy can be absorbed, thereby reducing the impact of the vibration generated by rail transit on the connection end of the rectangular connector body, and achieving the effect of connection buffering and dynamic connection.

[0041] The assembly plug includes a plug shell 5 and a plug-in terminal seat 6 connected to the plug shell 5. The plug-in terminal seat 6 has inclined surfaces on both sides to facilitate guiding the movement of the anti-bending rod 16. A socket is provided in the plug-in terminal seat 6 for the plug-in pin 4 to perform signal plugging. Furthermore, a plug-in conductor 19 is provided in the socket, and a spring-loaded copper core 20 is provided in the plug-in conductor 19. A conductive ball 21 is provided on the plug-in pin 4 to cooperate with the spring-loaded copper core 20.

[0042] The structure of the spring-type copper core 20 can be referred to Figure 8 As shown, the structural setting can ensure that in the dynamic buffer mode, the plug pin 4 inserted therein can ensure that its own side wall is in contact with the spring-loaded copper core 20 at all times, and can also ensure that the conductive ball 21 set on the plug pin 4 can always ensure the pressure contact effect with the spring-loaded copper core 20 in the dynamic mode.

[0043] The side wall of the plug housing 5 is fixedly connected with an adapting cover 7 adapted to the assembly seat 2, and the adapting cover 7 is provided with an active release component for releasing the limit of the blocking protective member;

[0044] Furthermore, the active release component includes an L-shaped locking socket 22 opened on the side wall of the adapter cover 7, and a block plug 23 adapted to the L-shaped locking socket 22 is provided at the end of the anti-folding rod 16. A blocking bar 24 is fixedly connected to the adapter cover 7, and the blocking bar 24 is connected to a release member 26 through a limit spring vertical block 25. The release member 26 passes through the L-shaped locking socket 22 and contacts the block plug 23.

[0045] The active release component is in the fixed connection mode state. By applying pressure to the connecting female socket and the assembly plug, the block plug 23 provided at the end of the anti-bending rod 16 can be accurately inserted into the L-shaped locking socket 22, thereby achieving the locking effect of multiple anti-bending rods 16, thereby cooperating with the switching locking member to achieve a tight connection between each plug pin 4 and the plug conductor 19.

[0046] Furthermore, an active frame 27 is slidably provided on the adapting cover 7 , the inner sidewall of the active frame 27 is inclined, and an inclined pressure plate 28 is fixedly provided on the sidewall of the releasing member 26 .

[0047] When the locked connection needs to be released, the active frame 27 can be pushed laterally so that the active frame 27 and the inclined pressure plate 28 cooperate to generate pressure on the release member 26. The release member 26 moves into the L-shaped locking socket 22, squeezing the card block plug 23 to release it from the locked state.

[0048] The switching locking member includes a fixed end seat 8 arranged on both sides of the female base shell plate 1, a locking column 9 is provided on the fixed end seat 8, and a limit stop cap 10 is provided at the end of the locking column 9. The limit stop cap 10 can play a positioning effect before docking. After docking, it can prevent the positioning claw 11 from being disengaged. Two sets of positioning claws 11 are provided on the locking column 9. The structure of the positioning claw 11 can be referred to Figure 6 The positioning claw 11 at the front end is connected to the locking column 9 through an energy-absorbing buffer, and positioning lock seats 12 are provided on both sides of the plug-end shell 5; the above-mentioned switching locking member has a compact structure and is easy to install, can achieve the effect of quick locking connection, and the assembly installation process is simple and efficient.

[0049] Furthermore, the energy-absorbing buffer includes a through energy-absorbing opening 29 opened on the side wall of the locking column 9, and the inner wall of the positioning spring claw 11 at the front end is fixedly connected with an energy-absorbing cross bar 30. The energy-absorbing cross bar 30 is located in the through energy-absorbing opening 29 and is connected to the inner wall of the through energy-absorbing opening 29 through a resisting energy-absorbing spring.

[0050] Among them, the switching locking member has two different locking states corresponding to the two connection modes (dynamic buffer mode and fixed connection mode) of the connection base and the assembly plug. The design of the positioning claw 11 and the two sets of positioning claws 11 cooperate with the energy-absorbing spring. There is no need to replace parts when switching modes. It can be used in different parts of the rail vehicle (such as the rigid area of ​​the vehicle body and the shock-absorbing area of ​​the equipment) by direct operation. Specifically:

[0051] Dynamic locking: In the dynamic buffering mode, the locking column 9 is inserted into the positioning lock seat 12, and the positioning claw 11 with an energy-absorbing buffer at the front end is inserted into the positioning lock seat 12. The positioning claw 11 will realize the connection locking of the positioning lock seat 12, and under the action of the energy-absorbing buffer, the elastic sliding between the locking column 9 and the positioning lock seat 12 can be realized, which can ensure the dynamic locking effect in the dynamic buffering mode.

[0052] Tightening and locking: In the fixed connection mode, after the locking column 9 is inserted into the positioning lock seat 12, the two positioning claws 11 are inserted into the positioning lock seat 12 one by one. The two positioning claws 11 squeeze each other to apply a tightening force to the positioning lock seat 12, thereby achieving a tightening connection between the limit stop cap 10 at the end of the locking column 9, the positioning claw 11 and the positioning lock seat 12, and realizing a tightened and locked connection state.

[0053] Before installation, the rectangular connector body proposed by the present invention is in an exposed connection socket, and the plug pins 4 thereon are on the left and right sides of the anti-bending rods 16, which can achieve buffering protection. When the plug pins 4 are subjected to deformation force, the anti-bending rods 16 on both sides will be forced first to provide buffering protection, thereby preventing the plug pins 4 from deforming up and down, thereby avoiding the situation of misalignment caused by the bending of the plug pins 4;

[0054] When the female connector and the assembly plug are installed, the staggered anti-bending rods 16 are arranged in a V-shape with each other. When the female connector and the assembly plug are docked, they can first contact the inclined surfaces on both sides of the plug-in terminal 6 to guide the docking, thereby achieving positioning and ensuring that the plug pin 4 can be accurately inserted into the socket and connected with the plug conductor 19. The conductive ball 21 provided on the plug pin 4 will be pressure-contacted with the spring-type copper core 20 in the plug conductor 19.

[0055] When corresponding installation is required according to different locations of rail transit, this rectangular connector has two modes: dynamic buffering mode and fixed connection mode. By switching the switching locking part between dynamic locking and tightening locking, the rectangular connector can be switched to dynamic buffering mode and fixed connection mode accordingly, thereby meeting more connection requirements.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rectangular connector with a combined quick lock structure, comprising a rectangular connector body and a switching locking member, characterized in that: The rectangular connector body is composed of a connecting female seat and an assembly plug end, the connecting female seat includes a female seat shell plate (1), an assembly seat (2) and a protective end plate (3) connected to the assembly seat (2), the connecting female seat is provided with a plug pin (4), and the protective end plate (3) is provided with a blocking protective piece for storing force to protect the plug pin (4); The assembly plug includes a plug shell (5) and a plug-in terminal seat (6) connected to the plug shell (5), a socket for a plug pin (4) to perform signal plugging is provided in the plug-in terminal seat (6), a side wall of the plug shell (5) is fixedly connected to an adapter cover (7) adapted to the assembly seat (2), and an active release component for releasing the limit of the blocking protective element is provided on the adapter cover (7); The switching locking member includes a fixed end seat (8) arranged on both sides of the female seat shell plate (1), a locking column (9) is arranged on the fixed end seat (8), a limit stop cap (10) is arranged at the end of the locking column (9), two groups of positioning claws (11) are sleeved on the locking column (9), the positioning claws (11) located at the front end are connected to the locking column (9) through an energy absorbing buffer, and positioning lock seats (12) are arranged on both sides of the plug end shell (5); The switching locking member has two different locking states corresponding to the two connection modes of the connecting female socket and the assembly plug: Dynamic locking: In the dynamic buffering mode, the locking column (9) is inserted into the positioning lock seat (12), and the positioning claw (11) provided with the energy absorbing buffer at the front end is inserted into the positioning lock seat (12). The positioning claw (11) can realize the connection and locking of the positioning lock seat (12), and under the action of the energy absorbing buffer, the locking column (9) and the positioning lock seat (12) can be elastically slidable, so that the dynamic locking effect can be ensured in the dynamic buffering mode; Tightening and locking: In the fixed connection mode, after the locking column (9) is inserted into the positioning lock seat (12), the two positioning claws (11) are inserted into the positioning lock seat (12) one by one, and the two positioning claws (11) are squeezed against each other to apply a tightening force to the positioning lock seat (12), thereby achieving a tightening connection between the limit stop cap (10) at the end of the locking column (9), the positioning claws (11) and the positioning lock seat (12), and realizing a tightening and locking connection state.

2. The rectangular connector with a combined quick lock structure according to claim 1, characterized in that: The blocking protective member comprises a force storage vertical groove (13) provided on the protective end plate (3); the inner wall of the force storage vertical groove (13) is connected to a force storage connecting seat (14) via a force storage sliding member; and the force storage connecting seat (14) is connected to an anti-bending rod (16) via a torsion spring shaft (15).

3. The rectangular connector with a combined quick lock structure according to claim 2, characterized in that: The force storage vertical groove (13) is arranged on the side wall of the protective end plate (3) between adjacent plug pins (4), and the adjacent anti-bending rods (16) are staggered to achieve the purpose of blocking the horizontal bending of the plug pins (4).

4. The rectangular connector with a combined quick lock structure according to claim 3, characterized in that: The force storage sliding member includes a sliding opening (17) provided on the side walls on both sides of the force storage vertical groove (13); the force storage sliding blocks (18) are fixedly connected to both sides of the force storage connecting seat (14); the force storage sliding blocks (18) are located in the sliding opening (17) and are connected to the inner wall of the sliding opening (17) via a force storage spring.

5. The rectangular connector with a combined quick lock structure according to claim 1, characterized in that: A plug-in conductor (19) is provided in the socket, a spring-loaded copper core (20) is provided in the plug-in conductor (19), and a conductive ball (21) is provided on the plug-in pin (4) and is connected to the spring-loaded copper core (20).

6. The rectangular connector with a combined quick lock structure according to claim 2, characterized in that: The active release component comprises an L-shaped locking socket (22) provided on the side wall of the adapting cover (7); a card block plug (23) adapted to the L-shaped locking socket (22) is provided at the end of the anti-folding rod (16); a blocking bar (24) is fixedly connected to the adapting cover (7); the blocking bar (24) is connected to a release member (26) via a limit spring vertical block (25); the release member (26) penetrates into the L-shaped locking socket (22) and contacts the card block plug (23).

7. The rectangular connector with a combined quick lock structure according to claim 6, characterized in that: An active frame (27) is slidably provided on the adapting cover (7), an inner side wall of the active frame (27) is inclined, and an inclined pressure plate (28) is fixedly provided on a side wall of the releasing member (26).

8. The rectangular connector with a combined quick lock structure according to claim 7, characterized in that: The energy absorbing buffer comprises an energy absorbing opening (29) formed on the side wall of the locking column (9), an energy absorbing cross bar (30) is fixedly connected to the inner wall of the positioning claw (11) at the front end, and the energy absorbing cross bar (30) is located in the energy absorbing opening (29) and is connected to the inner wall of the energy absorbing opening (29) via a resisting energy absorbing spring.

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