Safety belt lock catch adaptive lock tongue anti-misplug structure, corresponding lock catch and corresponding lock tongue

Abstract

The embodiment of the invention discloses an anti-misplug structure for a safety belt lock catch matched with a lock tongue and a corresponding lock catch and lock tongue, and is characterized in that a limiting mechanism protruding towards the inside of the cross section of a channel is arranged in the channel of the lock catch, and a receding mechanism for the limiting mechanism to pass through is arranged on the surface of a lock tongue inserting part of the lock tongue. When the matched spring bolt is inserted, the limiting mechanism is embedded into the receding mechanism, and therefore the spring bolt inserting part can be smoothly inserted into the channel. When the non-adaptive spring bolt is inserted, the limiting mechanism cannot be embedded into the abdicating mechanism, or no abdicating mechanism is provided for the limiting mechanism to pass through, so that the spring bolt inserting part is rigidly propped against the limiting mechanism, and the spring bolt is prevented from being continuously inserted. Mutual anti-misplug among a plurality of locks is realized through a pure mechanical structure, correct wearing of the safety belt is ensured, the protection efficiency is reliable, the structure is simple, and electronic components are not needed.

Description

Technical Field

[0001] This invention relates to the field of automotive passive safety technology, specifically to a seatbelt buckle adapter tongue anti-misinsertion structure and corresponding buckle and tongue. Background Technology

[0002] Car seat belts are one of the most basic and important passive safety devices in a vehicle. In passenger cars, especially family cars, there are usually two or three seats in the rear, and correspondingly, two or three seat belt buckles and corresponding latches are provided.

[0003] Currently, the seatbelt buckles and latches in the rear seats of most cars on the market use a uniform standard structure and size (e.g., Figure 4 As shown, the latch 10 and the latch 20 are shown. While this design reduces manufacturing costs and assembly complexity, it also presents significant safety hazards: because all latches and latches are identical in shape, rear passengers are highly likely to mistakenly insert the latch into a latch for a seat other than their own when wearing their seatbelts, for example, inserting the latch of the left seat into the latch of the middle seat.

[0004] This "misalignment" causes an unexpected change in the direction of the seatbelt webbing, deviating the seatbelt's restraint on the body from the engineer's intended ideal direction. In the event of a collision, the restraint performance of the incorrectly positioned seatbelt is significantly reduced, preventing it from maximizing its protective function according to the pre-set protection logic and thus failing to effectively safeguard passenger safety.

[0005] Furthermore, with increasing emphasis on the safety of the rear middle seat, some models have begun to equip it with a separate seatbelt latch (the so-called "third lock"). However, existing seatbelt interlocking logic is typically designed to support interlocking between two locks (such as the left and right seats), and cannot effectively adapt to scenarios where three locks are present simultaneously or used dynamically (such as any two being active). The newly added third latch lacks structural recognition and error prevention mechanisms with the original latch, which may result in incorrect insertion or failure to insert due to incompatibility, limiting the flexibility and safety of the seatbelt system configuration.

[0006] Existing technologies also include some error-proofing solutions, such as electronic sensor identification and RFID tag matching. However, these solutions increase system complexity, cost, and failure rate, and their reliability may be challenged in harsh automotive operating environments. Summary of the Invention

[0007] To address this, embodiments of the present invention provide a seatbelt buckle adapter anti-misinsertion structure and corresponding buckle and latch to solve one or more of the aforementioned technical problems.

[0008] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0009] The first aspect of the present invention provides a seat belt buckle adapter anti-misinsertion structure, including a buckle and a latch, the latch including a latch insertion part, the buckle having a channel for the latch to be inserted, characterized in that a limiting mechanism protruding into the cross-section of the channel is provided in the channel, and a clearance mechanism for the limiting mechanism to pass through is provided on the surface of the latch insertion part.

[0010] Furthermore, the latch also has a slotted seat located within the channel. The slotted seat includes a rear side plate and a left side plate and a right side plate located on the left and right sides of the rear side plate. The limiting mechanism is a rigid protrusion, wherein the front side wall of the rear side plate has at least one bottom protrusion, and the right side wall of the left side plate and the left side wall of the right side plate each have a side protrusion. The two side protrusions are symmetrically distributed left and right. The bottom protrusion and the side protrusion are both close to the entrance of the channel. The distance between the two side protrusions is less than the width of the latch insertion part. The distance between the last side boundary of the side protrusion and the rear side plate is greater than the thickness of the latch insertion part, and the distance between the last side boundary of the side protrusion and the rear side plate is less than the sum of the thickness of the latch insertion part and the height of the bottom protrusion. The clearance mechanism is a slotted structure, wherein one side surface of the latch insertion part has a strip-shaped groove for the bottom protrusion to pass through.

[0011] Furthermore, the bottom protrusion is a single point and is located at the center of the width direction of the rear side plate.

[0012] Furthermore, the side protrusions are elliptical protrusions, which are inclined with the upper end forward and the lower end backward.

[0013] Furthermore, the latch also includes a handle portion fixed to one end of the insertion portion away from the strip groove, the handle portion having a flat opening for the webbing to pass through.

[0014] The second aspect of the present invention provides a seat belt buckle, which is used in the seat belt buckle adapter tongue anti-misinsertion structure provided in the first aspect of the present invention. The seat belt buckle is provided with a channel for the insertion of the tongue, and a limiting mechanism protruding into the cross-section of the channel is provided in the channel.

[0015] Furthermore, the seat belt buckle is also provided with a groove-shaped seat located in the channel. The groove-shaped seat includes a rear side plate and a left side plate and a right side plate located on the left and right sides of the rear side plate. The limiting mechanism is a rigid protrusion. The front side wall of the rear side plate is provided with at least one bottom protrusion. The right side wall of the left side plate and the left side wall of the right side plate are respectively provided with a side protrusion. The two side protrusions are symmetrically distributed from left to right. The bottom protrusion and the side protrusion are both close to the entrance of the channel. The distance between the two side protrusions is less than the width of the insertion part of the standard lock tongue. The distance from the last side boundary of the side protrusion to the rear side plate is greater than the thickness of the insertion part of the standard lock tongue. The distance from the last side boundary of the side protrusion to the rear side plate is less than the sum of the thickness of the insertion part of the standard lock tongue and the height of the bottom protrusion.

[0016] The third aspect of the present invention provides a seat belt latch, which is used in the seat belt buckle adapter latch anti-misinsertion structure provided in the first aspect of the present invention. The seat belt latch includes a latch insertion part, and the surface of the latch insertion part is provided with a clearance mechanism for the passage of a limiting mechanism.

[0017] Furthermore, the clearance mechanism is a rigid protrusion, wherein a strip-shaped groove is provided on one side surface of the latch insertion part. The position, shape and depth of the strip-shaped groove are configured such that when the latch insertion part is inserted into the adapted seat belt buckle, the strip-shaped groove can accommodate the bottom protrusion of the seat belt buckle and allow the bottom protrusion to pass smoothly, and allow the latch insertion part to pass smoothly through the restriction of the side protrusion of the seat belt buckle.

[0018] The embodiments of the present invention have the following advantages:

[0019] 1. Effectively solves the core safety hazard of incorrect insertion of the rear seat latch. A purely mechanical identification and blocking system is constructed through a limiting mechanism within the channel and a yielding mechanism at the latch insertion point. When a compatible latch (where the limiting mechanism and yielding mechanism are matched) is inserted, the limiting mechanism engages with the yielding mechanism, allowing the latch to be inserted at the correct height and posture. When a non-compatible latch (where the limiting mechanism and yielding mechanism are mismatched, or there is no yielding mechanism) is inserted, its insertion point rigidly interferes with the limiting mechanism, physically preventing further insertion. This mechanism fundamentally eliminates the possibility of incorrect latch insertion into a non-corresponding latch, ensuring that the seatbelt webbing always restrains the occupant along the designed direction, directly solving the primary problem in the background technology where incorrect insertion leads to reduced protective effectiveness and endangers occupant safety.

[0020] 2. It provides a stable and reliable purely mechanical error-proofing mechanism. This solution relies entirely on the cooperation of purely mechanical structures (limiting and yielding mechanisms, such as bottom protrusions, side protrusions, and strip grooves) to achieve error-proofing, without requiring any sensors, circuits, or identification tags. Therefore, its error-proofing function is unaffected by electromagnetic interference, power failures, or software errors, exhibiting extremely high environmental tolerance and long-term reliability. Its "rigid resistance" error-proofing principle ensures effectiveness even under misoperation or forced insertion attempts, avoiding the failure risks that electronic error-proofing systems may have, and improving the reliability of the entire seat belt system.

[0021] 3. It provides a universal structural foundation for achieving mutual protection between multiple locks (such as three locks). Under the error-proofing mechanism that requires the matching of the limiting mechanism and the yielding mechanism for correct insertion, by setting limiting mechanisms at different positions within the passage for the latches of different rear seats, and setting corresponding yielding mechanisms for the latches of each seat, a unique "mechanical key" can be created for each "latch-latch pair". This breaks through the limitation of traditional systems that only support mutual protection between two locks, enabling the system to be extended to support unique matching between three or more locks. It provides a feasible technical path for adapting to complex usage scenarios with multiple rear seats (including the addition of a third lock), and responds to the need for multi-lock mutual protection and coordination capabilities in the background technology. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 This is a schematic diagram of a seatbelt buckle adapter anti-misinsertion structure provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a seatbelt buckle with a tongue anti-misinsertion structure provided in an embodiment of the present invention;

[0026] Figure 3This is a schematic diagram of the locking tongue structure of a seat belt buckle adapter locking tongue anti-misinsertion structure provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the existing seat belt buckle and latch mentioned in the background art of this invention.

[0028] In the diagram: 10, latch; 20, bolt; 1, bolt insertion part; 2, slotted seat; 3, bottom protrusion; 4, side protrusion; 5, strip groove; 6, handle part; 7, flat opening. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1 provides a seat belt buckle adapter anti-misinsertion structure for the locking tongue, including a buckle and a locking tongue. The locking tongue includes a locking tongue insertion part 1. The buckle is provided with a channel for the locking tongue to be inserted. A limiting mechanism protruding into the cross-section of the channel is provided in the channel. The surface of the locking tongue insertion part 1 is provided with a clearance mechanism for the limiting mechanism to pass through.

[0031] For example, such as Figure 1-3 As shown, the limiting mechanism is a rigid protrusion, and the clearance mechanism is a groove structure. A groove seat 2 is provided in the channel. The groove seat 2 includes a rear side plate and a left side plate and a right side plate located on the left and right sides of the rear side plate. The front side wall of the rear side plate is provided with at least one bottom protrusion 3. The right side wall of the left side plate and the left side wall of the right side plate are respectively provided with a side protrusion 4, and the two side protrusions 4 are symmetrically distributed on the left and right sides. The bottom protrusion 3 and the side protrusion 4 are both close to the entrance of the channel, and the edges of the three protrusions facing the inside of the channel have no chamfer. The distance between the two side protrusions 4 is less than the width of the latch insertion part 1. The distance between the last side boundary of the side protrusion 4 and the rear side plate is greater than the thickness of the latch insertion part 1. The distance between the last side boundary of the side protrusion 4 and the rear side plate is less than the sum of the thickness of the latch insertion part 1 and the height of the bottom protrusion 3. A strip groove 5 is provided on one side surface of the latch insertion part 1 for the bottom protrusion 3 to pass through.

[0032] By adopting the above technical solution, the following technical effects are achieved:

[0033] 1. Effectively solves the core safety hazard of mis-insertion of the rear latch. A purely mechanical identification and blocking system is constructed by setting a bottom protrusion 3 on the rear side plate of the latch slot seat 2, side protrusions 4 on the left and right side plates, and a strip groove 5 on the latch insertion part 1. When a compatible latch (groove position matching) is inserted, the bottom protrusion 3 can embed into the strip groove 5, allowing the latch to be inserted at the normal height and posture. When a non-compatible latch (no groove or mismatched groove position) is inserted, its insertion part is pushed up by the bottom protrusion 3, causing the latch to be forced to shift, resulting in an tilted insertion posture. Because the distance from the last side boundary of the side protrusion 4 to the rear side plate is less than the sum of the thickness of the latch insertion part 1 and the height of the bottom protrusion 3, the pushed-up latch will rigidly interfere with the side protrusion 4, physically preventing it from further insertion. This mechanism fundamentally eliminates the possibility of the locking tongue being incorrectly inserted into the wrong buckle, ensuring that the seat belt webbing always restrains the occupant along the designed direction, directly solving the primary problem in the prior art where incorrect insertion leads to reduced protective effectiveness and endangers occupant safety.

[0034] 2. It provides a stable and reliable purely mechanical error-proofing mechanism. This solution relies entirely on the cooperation of a purely mechanical structure (bottom protrusion 3, side protrusion 4, and strip groove 5) to achieve error-proofing, without the need for any sensors, circuits, or identification tags. Therefore, its error-proofing function is unaffected by electromagnetic interference, power failure, or software errors, exhibiting extremely high environmental tolerance and long-term reliability. Its "rigid resistance" error-proofing principle ensures effectiveness even under misoperation or forced insertion attempts, avoiding the failure risks that electronic error-proofing systems may have, and improving the reliability of the entire seat belt system.

[0035] 3. It provides a universal structural foundation for achieving mutual protection between multiple locks (such as three locks). With the bottom protrusion 3 and the strip groove 5 interlocking, and the side protrusion 4 rigidly abutting against the insertion part, a unique "mechanical key" can be created for each "latch-latch pair" by setting bottom protrusions 3 at different lateral positions on the rear side panel for the latches of different rear seats (and correspondingly adjusting the layout of the side protrusions 4), and setting corresponding strip grooves 5 for each seat's latch. This breaks through the traditional limitation of only supporting mutual protection between two locks, enabling the system to be extended to support unique matching between three or more locks. It provides a feasible technical path for adapting to complex usage scenarios with multiple rear seats (including the addition of a third lock), responding to the need for multi-lock mutual protection and collaborative capabilities in the background technology.

[0036] For example, the bottom protrusion 3 is a single one and is located at the center of the width direction of the rear side panel.

[0037] By adopting the above technical solution, the following technical effects are achieved: the point of application of the supporting or jacking force of the bottom protrusion 3 on the bolt is located at the center of the bolt width, resulting in symmetrical force distribution. This helps the bolt remain stable during insertion and prevents jamming or abnormal wear caused by off-center loading. The central layout is one of the simplest and most universal designs, facilitating processing and inspection, reducing manufacturing complexity and cost, and providing convenience for mass production.

[0038] For example, the bottom protrusion 3 is a cylindrical protrusion with a diameter of 1.1 mm and a height of 1 mm; the strip groove 5 has a width of 4.8 mm and a depth of 1.5 mm.

[0039] By adopting the above technical solution, the following technical effects are achieved: a verified specific size fit is provided (bottom protrusion 3 diameter 1.1mm, height 1mm, strip groove 5 width 4.8mm, depth 1.5mm). This size design ensures that the bottom protrusion 3 can be smoothly inserted into the groove with an appropriate gap, while ensuring that the groove depth is sufficient to accommodate the height of the protrusion, so that the matching lock tongue can be fully lowered to the low position, providing size guarantee for accurate error prevention.

[0040] For example, the side protrusion 4 is an elliptical protrusion, which is inclined with the upper end forward and the lower end backward.

[0041] By adopting the above technical solution, the following technical effects are achieved: The elliptical protrusion is inclined at the upper end forward and the lower end backward. Its inclined surface can play a better guiding and progressive resisting role when the non-fitting latch is pushed up, making the blocking process smoother, reducing stress concentration, and improving the durability of the component. The inclined structure helps guide the fitting latch to slide in more smoothly, optimizing the insertion feel when the user wears it correctly.

[0042] For example, the distance between the foremost and last side boundaries of the side protrusion 4 is 2.8 mm, and the distance between the uppermost and lowermost side boundaries is 6.5 mm.

[0043] By adopting the above technical solution, the following technical effects are achieved: the specific length and width dimensions (2.8mm x 6.5mm) of the side protrusion 4 are specified, ensuring that it has sufficient structural strength to withstand the impact force of the non-fitting locking tongue, and at the same time, its size is optimized so as to reliably generate blocking interference.

[0044] In this embodiment, the latch also includes a handle 6 fixed to one end of the insertion part away from the strip groove 5, and the handle 6 is provided with a flat opening 7 for the webbing to pass through.

[0045] In the second embodiment, a seat belt buckle for the anti-misinsertion structure of the above embodiment is provided. The seat belt buckle has a channel for the insertion of the locking tongue, and a limiting mechanism protruding into the cross-section of the channel is provided in the channel.

[0046] For example, the limiting mechanism is a rigid protrusion. A slotted seat is provided in the channel, the slotted seat includes a rear side plate and a left side plate and a right side plate located on the left and right sides of the rear side plate; the front side wall of the rear side plate is provided with at least one bottom protrusion; the right side wall of the left side plate and the left side wall of the right side plate are each provided with a side protrusion, the two side protrusions are symmetrically distributed left and right; wherein, the bottom protrusion and the side protrusion are both close to the entrance of the channel, the distance between the two side protrusions is less than the width of the insertion part of the standard lock tongue, the distance between the last side boundary of the side protrusion and the rear side plate is greater than the thickness of the insertion part of the standard lock tongue, and the distance between the last side boundary of the side protrusion and the rear side plate is less than the sum of the thickness of the insertion part of the standard lock tongue and the height of the bottom protrusion.

[0047] For example, the bottom protrusion and the side protrusion are integrally formed with the groove seat; the bottom protrusion is a cylindrical protrusion with a diameter of 1.1 mm and a height of 1 mm; the side protrusion is an elliptical protrusion, which is inclined with the upper end forward and the lower end backward, and the distance between the frontmost side boundary and the backmost side boundary of the side protrusion is 2.8 mm, and the distance between the uppermost side boundary and the lowermost side boundary is 6.5 mm.

[0048] By adopting the above technical solution, the following technical effects are achieved: the bottom protrusion and the side protrusion are integrally formed with the groove seat, which greatly enhances the connection strength and overall reliability of the protrusion part, avoids the risk of loosening and falling off that may occur with assembled protrusions, and meets the high durability requirements of automotive parts.

[0049] In a third embodiment, a seat belt latch for the anti-misinsertion structure of the above embodiments is provided, including a latch insertion portion, the surface of which is provided with a clearance mechanism for the passage of a limiting mechanism.

[0050] For example, the clearance mechanism is a rigid protrusion. One side surface of the latching tongue is provided with a strip-shaped groove, the position, shape and depth of which are configured such that when the latching tongue is inserted into the adapted seat belt buckle, the strip-shaped groove can accommodate the bottom protrusion of the seat belt buckle and allow the bottom protrusion to pass smoothly, and allow the latching tongue to pass smoothly through the restriction of the side protrusion of the seat belt buckle.

[0051] For example, the width of the strip groove is 4.8 mm and the depth is 1.5 mm; the seat belt latch also includes a handle fixed to the end of the insertion part away from the strip groove, and the handle is provided with a flat opening for the webbing to pass through.

[0052] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A seatbelt buckle adapter anti-misinsertion structure, comprising a buckle and a latch, wherein the latch includes a latch insertion portion, and the buckle is provided with a channel for the latch to be inserted, characterized in that, The channel is provided with a limiting mechanism that protrudes into the cross-section of the channel, and the surface of the latch insertion part is provided with a clearance mechanism for the limiting mechanism to pass through.

2. The seat belt buckle adapter anti-misinsertion structure as described in claim 1, characterized in that, The latch also has a slotted seat located within the channel. The slotted seat includes a rear side plate and a left side plate and a right side plate located on the left and right sides of the rear side plate. The limiting mechanism is a rigid protrusion. The front side wall of the rear side plate has at least one bottom protrusion, and the right side wall of the left side plate and the left side wall of the right side plate each have a side protrusion. The two side protrusions are symmetrically distributed. The bottom protrusion and the side protrusion are both close to the entrance of the channel. The distance between the two side protrusions is less than the width of the latch insertion part. The distance from the last side boundary of the side protrusion to the rear side plate is greater than the thickness of the latch insertion part, and the distance from the last side boundary of the side protrusion to the rear side plate is less than the sum of the thickness of the latch insertion part and the height of the bottom protrusion. The clearance mechanism is a slotted structure. One side surface of the latch insertion part has a strip-shaped groove for the bottom protrusion to pass through.

3. The seat belt buckle adapter anti-misinsertion structure as described in claim 2, characterized in that, The bottom protrusion is a single point and is located at the center of the width direction of the rear side plate.

4. The seat belt buckle adapter anti-misinsertion structure as described in claim 2, characterized in that, The side protrusions are elliptical protrusions, which are inclined with the upper end forward and the lower end backward.

5. The seat belt buckle adapter anti-misinsertion structure as described in claim 2, characterized in that, The latch also includes a handle fixed to one end of the insertion part away from the strip groove, the handle having a flat opening for the webbing to pass through.

6. A seat belt buckle for use in the anti-misinsertion structure of the seat belt buckle adapter tongue as described in any one of claims 1-5, characterized in that: The seat belt buckle has a channel for inserting the locking tongue, and a limiting mechanism protruding into the cross-section of the channel is provided in the channel.

7. The seatbelt buckle as described in claim 6, characterized in that: The seatbelt buckle also has a slotted seat located in the channel. The slotted seat includes a rear side plate and a left side plate and a right side plate located on the left and right sides of the rear side plate. The limiting mechanism is a rigid protrusion. The front side wall of the rear side plate has at least one bottom protrusion. The right side wall of the left side plate and the left side wall of the right side plate each have a side protrusion. The two side protrusions are symmetrically distributed. The bottom protrusion and the side protrusion are both close to the entrance of the channel. The distance between the two side protrusions is less than the width of the insertion part of the standard lock tongue. The distance from the last side boundary of the side protrusion to the rear side plate is greater than the thickness of the insertion part of the standard lock tongue. The distance from the last side boundary of the side protrusion to the rear side plate is less than the sum of the thickness of the insertion part of the standard lock tongue and the height of the bottom protrusion.

8. A seat belt latch for use in the anti-misinsertion structure of the seat belt buckle adapter latch as described in any one of claims 1-5, characterized in that: The seat belt latch includes a latch insertion part, and the surface of the latch insertion part is provided with a clearance mechanism for the limit mechanism to pass through.

9. The seatbelt locking tongue as described in claim 8, characterized in that: The clearance mechanism is a rigid protrusion, wherein a strip groove is provided on one side surface of the latch insertion part. The position, shape and depth of the strip groove are configured such that when the latch insertion part is inserted into the appropriate seat belt buckle, the strip groove can accommodate the bottom protrusion of the seat belt buckle and allow the bottom protrusion to pass smoothly, and allow the latch insertion part to pass smoothly through the restriction of the side protrusion of the seat belt buckle.

Images