Foldable single seat for vehicles with dual recliner structure

Abstract

A foldable single seat for a vehicle including a dual recliner structure is disclosed. The foldable single seat for a vehicle according to an embodiment of the present invention comprises: a mounting fixing part having a structure that can be mounted and fixed on an original rail installed on the interior floor of a vehicle; a seat body part mounted on the upper part of the mounting fixing part and having a seat structure that supports the lower body and part of the upper body of a passenger, wherein a first segmented seat supporting the back, a second segmented seat supporting the buttocks, and a third segmented seat supporting the thighs can each be folded independently; and a folding driving part mounted on the upper part of the mounting fixing part and operated by a user's control signal to drive the folding of each part constituting the seat body part.

Description

Technology Field

[0001] The present invention relates to a foldable single seat for a vehicle, and more specifically, to a foldable single seat for a vehicle that applies a dual recliner structure to enable adjustment of not only the front part but also the rear part of the seat, as well as the ability to fold and stack the front and rear parts. Background Technology

[0002] Various types of single seats for vehicles have been commercialized, and these seats are primarily used to enhance vehicle space utilization and provide passenger comfort. Single seats currently on the market are mainly constructed with structures that perform folding and reclining functions based on electric cylinder motors. While this electric drive system offers the advantage of easily adjusting the seat angle with a single button, various problems arise in terms of durability and operational precision during repeated use.

[0003] The drive structure of a cylinder motor inevitably involves structural tolerances, which frequently leads to backlash during operation. If backlash accumulates, the seat shakes unstably from its designated position, severely compromising the occupant's seating stability. In particular, when combined with vehicle vibrations during long drives, these subtle shakes cause discomfort to the occupant and contribute to increased fatigue.

[0004] Conventional cylinder motor-based folding seats experience reduced operational precision as play increases once the range of motion exceeds approximately 15 to 20 degrees after the folding and reclining movements have begun. This play causes the entire seat to shake slightly when the occupant leans back or supports their thighs. Consequently, the user continuously feels a sense of insecurity that the seat is not firmly fixed.

[0005] Currently, single seats in vehicles often feature a single integrated seat back and seat cushion. While this structure is advantageous for structural simplification, it limits the ability to recline the seat back independently or fold the thigh support separately. Consequently, there are limitations in making it difficult to finely adjust the seat according to the occupant's physical condition or preferences.

[0006] Conventional foldable seats employ a structure where the seat back is folded forward or the seat surface is folded to maximize space utilization, but the folding motion is not smooth due to structural constraints that prevent the seat back and seat surface from operating independently. In particular, during the process of fully stacking the seats, parts of the seats do not interlock precisely and become misaligned, which limits the space optimization effect in the folded state.

[0007] Currently commercialized foldable seats are designed so that the front support (thigh support) and the rear support (backrest) share a single structure or the same axis of rotation. While this design is advantageous in terms of simplifying the manufacturing process and reducing costs, it has clear limitations in providing the precise angle adjustment or individual folding functions desired by users.

[0008] Existing foldable single seats for vehicles lack sufficient stability when folded. Even after folding, the various elements of the seat easily shake due to vehicle vibrations or passenger movements, significantly reducing cargo loading capabilities and space utilization. Furthermore, this structural instability negatively impacts the user's intuitive operation experience.

[0009] The electric motor system also has the issue of inconsistent operating speed. During the folding or reclining process, the folding speed varies depending on variables such as changes in motor output, battery voltage drop, and circuit noise, providing users with an inconsistent operating experience. In particular, passengers feel uncomfortable when fast and slow speeds alternate.

[0010] The structure of conventional technology also has the disadvantage of occupying a large amount of space for the cylinder motor drive unit. As the electric drive unit, its control circuits, wiring, and brackets are concentrated at the bottom of the seat, they occupy a significant portion of the vehicle's floor space. This limits the utilization of interior space and results in a problem where floor space is not efficiently secured even when the seat is fully folded.

[0011] Current foldable single seats for vehicles lack completeness in both functionality and durability, and suffer from a combination of various drawbacks, including the instability of the folding mechanism, the inability to operate individual seat parts, and structural issues related to electric motors. In particular, there is a lack of technical solutions that efficiently utilize interior space and provide passengers with a stable and intuitive folding experience.

[0012] The present invention aims to solve the problems of the conventional technology described above. The present invention fundamentally eliminates the backlash and structural clearance issues that occur in cylinder motor drive systems, and overcomes the limitations of the conventional technology by applying a dual recliner and a multi-hinge connection structure that allows the front and rear parts of the seat to be folded independently and provides a structure that is stably stacked even after folding. Prior art literature

[0013] Korean Patent Publication No. 10-2550551 (Registration Date: June 28, 2023) The problem to be solved

[0014] Conventional foldable single seats for vehicles suffer from structural play and backlash due to a cylinder motor-based folding drive method, which causes the seat to shake or reduces stability. Additionally, since each component of the seat does not fold independently, it is difficult to adjust the angle to the user's preference, and space utilization is limited even after folding. The technical objective of the present invention is to provide a foldable single seat for vehicles that eliminates the cylinder motor and applies a dual recliner and a multi-hinge connection structure, thereby enabling the front and rear parts of the seat to be folded stably respectively, and ensuring that the seat is rigidly stacked even in the folded state, thereby simultaneously improving space utilization and durability. means of solving the problem

[0015] A foldable single seat for a vehicle according to one aspect of the present invention for achieving such an objective may comprise: a mounting fixing part having a structure that can be mounted and fixed on an original rail installed on the interior floor of the vehicle; a seat body part mounted on the upper part of the mounting fixing part and having a seat structure that supports the lower body and part of the upper body of a passenger, wherein a first segmented seat supporting the back, a second segmented seat supporting the buttocks, and a third segmented seat supporting the thighs can each be folded independently; and a folding driving part mounted on the upper part of the mounting fixing part and operated by a user's control signal to drive the folding of each part constituting the seat body part.

[0016] In one embodiment of the present invention, the mounting fixing part may be configured to include: a rail mounting module that is mounted on an original rail installed on the interior floor of a vehicle, is fixed by changing its position at a location desired by the user, and is equipped with an LM guide to change the position of the mounting fixing part on the original rail within a preset range forward and backward; and a seat mounting module that is mounted in an integrated structure on the upper part of the rail mounting module, is fixed by mounting a folding drive part on the upper part, and has a fixing bracket mounted symmetrically on both sides to support the hinge connection part of the folding drive part.

[0017] In one embodiment of the present invention, the folding drive unit may be configured to include: a first hinge connecting part mounted on the rear end of the fixed bracket, hinge connecting both lower ends of the fixed bracket and the first section sheet, and changing the angle of the first section sheet by operating according to a user's control signal; a second hinge connecting part mounted on the front end of the fixed bracket, hinge connecting both rear ends of the fixed bracket and the second section sheet, and changing the angle of the second section sheet by operating according to a user's control signal; and a hinge connecting module mounted on the front end of the second section sheet, hinge connecting both rear ends of the second section sheet and the third section sheet, and changing the angle of the third section sheet by operating according to a user's control signal.

[0018] In one embodiment of the present invention, the seat body portion may comprise: a second segmented seat that is mounted on a second hinge connecting portion mounted on the front end of the fixed bracket and extends forward by a predetermined length based on the second hinge connecting portion to form a seat structure capable of supporting the user's buttocks; a first segmented seat that is mounted on a first hinge connecting portion mounted on the rear end of the fixed bracket and extends backward by a predetermined length based on the first hinge connecting portion to form a seat structure capable of supporting the user's back; and a third segmented seat that is mounted on a hinge connecting module mounted on the front end of the second segmented seat and extends forward by a predetermined length based on the hinge connecting module to form a seat structure capable of supporting the user's thighs.

[0019] In one embodiment of the present invention, the folding drive unit may be configured to include a stacking guide link, which is a link structure connecting the hinge binding module and the rear end of the third segment sheet, extending a predetermined length from the hinge binding module to one side and extending by being bent at a predetermined angle, and which rotates by the rotational movement of the hinge binding module to induce folding in a stacked form in which the third segment sheet comes into contact with the upper surface of the second segment sheet. Effects of the invention

[0020] The present invention fundamentally resolves backlash and structural clearance issues by eliminating cylinder motors and applying a dual recliner and hinge connection structure. The first, second, and third segmented seats can each be folded independently, providing an optimal seating environment tailored to the occupant's physical condition. When not in use, the seats can be stacked sequentially to effectively secure space within the vehicle. Furthermore, the mounting fixing unit is stably connected to the vehicle's original rails, allowing for free adjustment of the seat position, and remains robust without shaking due to vibration or external impact even in the folded state. The folding drive unit, including a stacking guide link, performs the folding operation intuitively and smoothly, enabling the user to achieve maximum space utilization with minimal operation. This structure provides the effect of comprehensively improving manufacturing costs, ease of maintenance, and user convenience. Brief explanation of the drawing

[0021] FIG. 1 is a perspective view showing a foldable single sheet for a vehicle according to one embodiment of the present invention. FIG. 2 is a front view showing a foldable single sheet for a vehicle according to one embodiment of the present invention. FIG. 3 is a front perspective view showing a foldable single sheet for a vehicle according to one embodiment of the present invention. FIG. 4 is a plan view showing a foldable single sheet for a vehicle according to one embodiment of the present invention. FIG. 5 is a planar perspective view showing a foldable single sheet for a vehicle according to one embodiment of the present invention. Specific details for implementing the invention

[0022] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0023] Throughout this specification, when it is stated that one component is located "on" another component, this includes not only cases where one component is in contact with another component, but also cases where another component exists between the two components. Throughout this specification, when it is stated that a part "includes" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0024] FIG. 1 shows a perspective view of a foldable single sheet for a vehicle according to one embodiment of the present invention, FIG. 2 shows a front view of a foldable single sheet for a vehicle according to one embodiment of the present invention, and FIG. 3 shows a front perspective view of a foldable single sheet for a vehicle according to one embodiment of the present invention.

[0025] Referring to these drawings, according to the present embodiment of the foldable single seat (100) for a vehicle, by providing a mounting fixing part (110) of a specific structure, a seat body part (120), and a folding driving part (130), a cylinder motor can be omitted and a recliner operating structure applied to achieve stable folding operation, and a foldable single seat for a vehicle can be provided that can be stably mounted and operated on the vehicle's interior original rail.

[0026] Hereinafter, each component constituting the foldable single sheet (100) for a vehicle according to the present embodiment will be described in detail with reference to FIGS. 1 to 5.

[0027] Specific configuration and role of the mounting fixing part (110)

[0028] The mounting fixing part (110) is a structure that is directly seated on a genuine rail installed on the floor inside the vehicle and serves as a basic frame that supports the entire structure of the vehicle foldable single seat. The mounting fixing part (110) not only supports the load of the seat body part (120) and the folding drive part (130), but also secures rigidity capable of withstanding rotational loads and instantaneous impact loads generated during folding and reclining operations. Therefore, this structure is made of a material that simultaneously satisfies high strength and lightweighting, such as high-strength steel, aluminum alloy, or magnesium alloy.

[0029] The mounting fixing part (110) is largely divided into a rail mounting module (111) located at the bottom and a seat mounting module (112) located at the top, and these two modules are assembled as a single unit and firmly connected so as not to deform during operation. The rail mounting module (111) is responsible for connecting with the original rail, and the seat mounting module (112) forms a platform structure that supports the folding drive unit (130) and the seat body unit (120). This dual modular structure maximizes the convenience of adjusting the seat position, assembly, and maintenance.

[0030] The lower structure of the mounting fixing part (110) includes a plurality of fastening brackets and vibration-absorbing pads to strengthen the fastening strength with the vehicle floor. The fastening brackets are secured to the vehicle's original rails with fixing bolts and nuts, and an anti-slip texture or high-friction coating is applied to the surface of the brackets to maximize the fastening force during fastening. The vibration-absorbing pads are composed of elastic materials such as rubber, urethane, and silicone to effectively mitigate vibrations and shocks that occur during driving.

[0031] The mounting fixing part (110) has a structure that allows the seat to move freely back and forth on the vehicle's original rail. To achieve this, an LM guide method is applied, and a sliding block installed in the rail mounting module (111) moves along the rail. After the user positions the seat at a desired location, the seat can be immediately fixed through a ratchet locking device or a cam lock mechanism. This prevents unnecessary movement of the seat while driving and maximizes safety.

[0032] The mounting fixing part (110) is designed to be modular so that it can be applied to various vehicle models. The rail spacing, height adjustment function, bracket shape, etc., can be customized in detail for each vehicle model. In addition, the lower structure is provided with cable guide holes through which wires or pipes can pass, thereby minimizing interference with the vehicle's electrical system. This design increases productivity and maintenance efficiency while enabling user-customized seat configurations.

[0033] Detailed description of the rail-mounted module (111)

[0034] The rail mounting module (111) is located at the bottom of the mounting fixing part (110) and is structured to be directly connected to the original rail installed on the interior floor of the vehicle. The rail mounting module (111) performs the function of moving the seat back and forth and provides smooth sliding and strong fixation simultaneously within a range that does not compromise the structural safety of the vehicle. To this end, a high-precision LM guide rail and a highly durable sliding block are applied.

[0035] The rail-mounted module (111) is basically composed of a sliding unit and a locking unit. The sliding unit incorporates multiple roller bearings or linear ball bearings, providing a low-friction environment when moving the seat. The rollers are made of metal, ceramic, or engineering plastic materials, allowing them to operate without deformation even under high loads and maximizing durability. The locking unit is implemented using a ratchet clamp, cam lock, or pin lock method, allowing the seat to be securely fixed at a desired position.

[0036] The lower part of the rail mounting module (111) includes a fastening bracket designed to be precisely connected to the vehicle's original rail. This bracket has multiple fastening holes formed therein, allowing it to be freely adjusted to fit the vehicle's floor structure. Additionally, the bracket is made of extruded aluminum alloy or welded steel, providing excellent load distribution capabilities and strong resistance to shock and vibration.

[0037] A stopper that limits the range of movement is installed inside the rail-mounted module (111). The stopper sets a physical limit position to prevent the seat from moving excessively forward or backward. This is an important function to prevent the seat from unintentionally detaching in the event of a vehicle collision and to ensure the safety of the occupant. The stopper is covered with an elastic material to minimize noise in the event of a collision.

[0038] The rail-mounted module (111) is designed with an open or semi-closed structure to allow easy access to the sliding track and bearing section for ease of maintenance. Additionally, a grease nipple is installed to inject lubricating grease, which minimizes wear during regular maintenance and maintains sliding quality for a long period. This structure simultaneously improves the smoothness and safety of seat movement.

[0039] Detailed description of the seat mounting module (112)

[0040] The seat mounting module (112) is coupled to the top of the rail mounting module (111) and serves as a platform that stably supports the seat body (120) and the folding drive unit (130). This module is designed with a structure that efficiently distributes the weight of the occupant and the weight of the seat itself, and maintains stable support even during folding and reclining operations.

[0041] The upper surface of the seat mounting module (112) is provided with bracket mounting portions for hinge connection in a left-right symmetrical manner. These mounting portions are the locations where the first hinge connection portion (131) and the second hinge connection portion (132) are mounted, and they serve to directly support the rotational moment generated during the folding operation. A reinforcing plate is also embedded in the upper portion to support the central axis of the folding drive unit (130).

[0042] The seat mounting module (112) incorporates multiple cross ribs and vertical reinforcing plates internally to enhance shock absorption and torsional rigidity. This reinforcing structure fundamentally prevents the seat from twisting or deforming during the folding and unfolding process, and maintains structural stability even when the load of the occupant is unevenly distributed.

[0043] The lower part of the seat mounting module (112) is provided with a plurality of fastening points for connection with the rail mounting module (111). These points enable adjustment of the seat's front-to-back position and height, and, if necessary, allow for adjusting the angle between modules or inserting spacers to provide a user-customized seating environment. Additionally, shock-absorbing cushioning material is attached to the lower part to effectively absorb road surface shocks.

[0044] The seat mounting module (112) is designed to be modular so that it can be easily attached and detached. This allows for quick and easy work when replacing the seat body (120), maintaining the folding drive unit (130), or changing the vehicle interior. In addition, the upper surface is treated with anti-corrosion and anti-wear properties, ensuring excellent durability even after long-term use and maintaining the quality of the exterior.

[0045] Detailed description of the fixed bracket (113)

[0046] The fixed bracket (113) is symmetrically mounted on both the left and right sides of the seat mounting module (112) and is a core structure that firmly supports the hinge connection part of the folding drive unit (130). This bracket effectively distributes the rotational moment and dynamic load generated during the folding operation and serves as a reference point for the rotation axis that determines the folding and reclining angles of the seat.

[0047] The main feature of the fixed bracket (113) is a multi-stage binding pattern having multiple hinge binding holes. This hole pattern is designed to allow fine adjustment of the rotation axis positions of the first hinge binding part (131) and the second hinge binding part (132). Through this, the folding angle, reclining range, and stacking position of the seat can be optimized according to the user's requirements or vehicle model.

[0048] The internal structure of the bracket includes multiple bearing inserts and a rotation axis guide channel. The bearing inserts minimize rotational friction of the hinge axis and increase rotational precision. The guide channel guides the rotation axis of the hinge to maintain an accurate trajectory and simultaneously improves the smoothness and durability of the folding motion.

[0049] The fixed bracket (113) is made of high-strength rolled steel, aluminum die-casting, or composite carbon steel to ensure structural rigidity. The exterior of the bracket is coated with anti-rust and anti-wear coatings, and the curved surface treatment minimizes injuries to the occupant in the event of an impact. Additionally, a folding angle limiting stopper and a cushioning pad are integrated into a part of the bracket.

[0050] The fixed bracket (113) has a built-in cushioning mechanism that absorbs shock when folding is finished to enhance safety. It also includes a mechanical stopper that prevents excessive rotation during folding, thereby preventing damage to the structure and ensuring that the sheets are firmly stacked even in the folded state. This structure significantly improves the stability and precision of the folding operation.

[0051] Detailed description of the seat body part (120)

[0052] The seat body (120) is a core structure that supports the occupant's body and consists of a first segmented seat (121), a second segmented seat (122), and a third segmented seat (123). The seat body (120) is designed so that each segmented seat can be folded independently of the others, allowing for space saving in the folded state and providing optimal seating comfort in the unfolded state. This structure focuses on simultaneously satisfying the utilization of vehicle interior space and passenger convenience.

[0053] The seat body (120) is stably supported through a fixed bracket (113) and a hinge connection, and each separate seat operates independently by a folding drive unit (130). The position and path of the rotation axis are precisely designed so that each seat can rotate or be stacked without mutual interference. This structure enables smooth operation without collision or interference during the folding or reclining process.

[0054] The frame structure is constructed from high-rigidity metal, and the exterior cover is finished with high-quality synthetic leather, fabric, or mesh. The interior combines high-density foam cushions with suspension straps to minimize fatigue even during prolonged sitting. This combination of materials is lightweight yet highly durable, and the seat does not deform even when repeatedly folded or unfolded.

[0055] The seat body (120) is ergonomically designed to naturally maintain the occupant's sitting posture. The first section of the seat is slightly tilted backward to match the natural curve of the spine, and the second section of the seat stably supports the buttocks and pelvis. The third section of the seat is designed to support the lower thighs, thereby reducing fatigue in the lower body.

[0056] Each segmented seat is provided with guide protrusions and corresponding grooves on its bottom and top surfaces to ensure precise stacking even when folded. This prevents the seats from swaying sideways or gaps from forming after folding, and maintains a rigid stacked state even under vibrations while driving. This design offers stability and durability that go beyond mere space saving.

[0057] Detailed description of the first classification sheet (121)

[0058] The first segmented seat (121) is positioned at the rear of the seat body (120) and serves to support the back of the occupant. This seat is connected to the first hinge connecting part (131) mounted at the rear of the fixed bracket (113), and can perform folding or reclining movements backward along the hinge axis. In particular, a recliner mechanism is applied, allowing the user to freely adjust it to the desired angle.

[0059] The frame is constructed from high-rigidity aluminum alloy or high-strength rolled steel, and its interior is designed with an X-shaped reinforcement structure to effectively distribute the high rotational loads generated during the tilting process. The outer shell is finished with abrasion-resistant synthetic leather or fabric, while the interior features high-density foam and elastomer support, ensuring that the spine is not strained even during prolonged sitting.

[0060] The first section seat (121) has an angle limiting stopper built in to prevent it from folding beyond a certain angle when folded. This prevents hinge damage caused by excessive rotation and prevents the seat from colliding with the vehicle's interior panel. Additionally, when folding is finished, a cushioning pad on the bracket side operates to minimize impact and noise.

[0061] This seat is equipped with a lever or electric button interface that allows users to operate it intuitively, even while folding or reclining. The lever is located on the bracket side, while the button controls are linked to the side of the seat or the vehicle's center console. This enables users to adjust the seat intuitively and quickly.

[0062] The first section seat (121) can be completely folded toward the rear of the vehicle or the floor to secure space when folded, and when unfolded, an optimal backrest angle is provided according to the ergonomic design. As a result, the lower back and spine are not strained even during long drives, and the occupant is reliably protected from impacts while driving.

[0063] Detailed explanation of the second classification sheet (122)

[0064] The second segmented seat (122) is a main seat forming the center of the seat body (120) and is a core structure that supports the user's buttocks. This seat is connected to a second hinge connecting part (132) mounted on the front of the fixing bracket (113) and performs a folding operation while rotating back and forth around the second hinge connecting part. It also serves as a reference plane in the overall structure of the seat.

[0065] The frame is constructed from high-strength steel pipes or aluminum extrusions, and reinforcing struts for load distribution are positioned at the bottom of the frame. The upper surface of the seat features a multi-layer application of highly durable PU foam and memory foam, and a ventilation hole is placed in the center of the seat surface to prevent heat buildup even during prolonged sitting.

[0066] The second segmented sheet (122) is designed to be precisely stacked with the third segmented sheet (123) when folded. To this end, a guide groove is formed on the upper front side of the sheet, and a corresponding guide protrusion is provided on the rear side of the third segmented sheet. When folded, this coupling structure maintains the sheet firmly so that it does not shake from side to side.

[0067] The front end of the seat is connected to a hinge connection module (133) and serves as the rotation axis of the third section seat (123). This allows the third section seat to rotate stably during the folding operation and simultaneously effectively supports the load on the front of the seat. A bearing insertion structure for reducing friction is applied to the hinge connection part.

[0068] The second seat (122) is completely folded into the floor of the vehicle when folded to maximize space, and maintains an ergonomic seating curve when unfolded. Additionally, a suspension strap or vibration-absorbing pad is applied to the bottom of the seat to effectively absorb vehicle vibrations and shocks. Through this, the occupant can experience high seating comfort even during long-distance driving.

[0069] Detailed explanation of the third classification sheet (123)

[0070] The third section seat (123) is located at the front of the seat body (120) and serves to support the occupant's thigh. This seat is connected to a hinge connection module (133) mounted on the front end of the second section seat (122) and performs a folding motion that rotates back and forth around the hinge connection module. It is also linked with a stacking guide link (134) to ensure the precision of the folding motion.

[0071] The frame is made of extruded aluminum or carbon fiber composites that satisfy both lightweighting and rigidity. Multiple cross-reinforcement struts are installed inside the frame to evenly distribute the load on the lower thighs, and the seat surface is finished with synthetic leather that offers excellent water resistance and abrasion resistance.

[0072] The third section sheet (123) is accurately stacked by naturally rotating over the second section sheet (122) by the stacking guide link (134) during the folding operation. To this end, the bottom of the sheet includes a link connection part, a stopper pin for fixing the position when folding is completed, and a magnetic fastening structure. This structure prevents the sheet from unraveling or shaking due to vibration even in the folded state.

[0073] The front edge of the seat is designed in a curved shape to minimize pressure on the lower thighs, and an inclined surface is applied to ensure smooth load distribution. Additionally, the seat thickness is minimized to maximize interior space even when folded, and an integrated design of the frame and cushion is applied.

[0074] The third section sheet (123) is equipped with a soft closing mechanism to absorb shock during folding or unfolding operations. When folding is finished, it comes into contact with a cushioning pad mounted on the bracket side, and when unfolding, it unfolds smoothly along the guide rail of the link. This structure ensures durability and stability along with intuitive ease of operation for the user.

[0075] Detailed description of the folding drive unit (130)

[0076] The folding drive unit (130) is a core mechanism that performs the folding operation of the first segmented seat (121), the second segmented seat (122), and the third segmented seat (123) included in the seat body (120). The folding drive unit (130) can be operated electrically or manually and controls rotation and folding operations around the hinge axis of each segmented seat. This mechanism is designed to perform reclining, folding, and stacking operations intuitively and stably.

[0077] The folding drive unit (130) includes a first hinge connection unit (131), a second hinge connection unit (132), a hinge connection module (133), and a stacking guide link (134) as its main structure. Each hinge connection unit is connected between a fixed bracket (113) or a partition sheet and acts as a rotation axis, and this connection structure can stably withstand rotational moments and loads generated during folding. The durability of the folding drive unit is enhanced through a high-strength metal frame and a bearing insertion structure.

[0078] The operation method of the folding drive unit (130) is configured as manual drive using a lever or button, or electric drive using an electric motor. In the case of the electric drive method, a small motor is connected to each hinge joint, and a torque converter and a reduction gear are included, so the precision of operation is very high. In addition, when an excessive load occurs, a safety clutch is engaged to protect the mechanism.

[0079] Each hinge connecting part may operate in conjunction with each other or independently during the folding operation. For example, the first hinge connecting part (131) is responsible only for the reclining operation of the first sectioning sheet (121), and the second hinge connecting part (132) is responsible for the folding and tilting operation of the second sectioning sheet (122). The hinge connecting module (133) and the stacking guide link (134) are an interlocking mechanism for the folding and stacking operation of the third sectioning sheet (123).

[0080] The folding drive unit (130) also has a built-in shock absorption function. A soft closing damper or hydraulic damping device is included to prevent the seat from closing or unfolding rapidly during the folding operation. As a result, the occupant can perform the folding and unfolding operations very smoothly and stably, and shock damage to the seat or the interior of the vehicle is minimized.

[0081] Detailed description of the first hinge connection part (131)

[0082] The first hinge connecting part (131) is structured to hinge the rear end of the fixed bracket (113) and both lower sides of the first section seat (121), and is primarily responsible for the folding and reclining operation of the first section seat, which is the backrest of the seat. This hinge connecting part is designed so that the first section seat can be unfolded or folded backward around a rotation axis.

[0083] The first hinge connection part (131) consists of a hinge shaft, a bearing, and a connection plate installed between the fixed bracket and the first partition seat. The hinge shaft is made of high-strength steel or carbon steel, and the bearing serves to minimize rotational friction. The connection plate stably maintains the rotational trajectory of the hinge shaft and remains rigid without twisting even under excessive load.

[0084] The first hinge connecting part (131) has a folding angle limiting function. A stopper block is installed around the hinge axis to prevent the seat from rotating beyond a set angle. In addition, a cushioning pad is built inside the bracket to absorb shock when folding is finished, thereby preventing noise and damage to the structure that occurs during folding.

[0085] This locking mechanism can operate manually or electrically. In the manual mode, pulling the lever releases the locking mechanism, allowing the seat to be adjusted to the desired angle, and releasing the lever automatically locks it. In the electric mode, an electric motor rotates the hinge axis to enable precise angle control, and the seat can automatically return to frequently used angles using a memory function.

[0086] The first hinge connecting part (131) supports not only folding but also reclining functions. This allows the occupant to adjust the backrest to a desired angle even while driving, and when folding, it can be folded completely backward to secure space. This structure maximizes both the functionality of the seat and the space utilization.

[0087] Detailed description of the second hinge connection part (132)

[0088] The second hinge connection part (132) is a hinge connection structure that connects the front end of the fixed bracket (113) and the rear end of the second section seat (122). This connection part is designed so that the second section seat can perform folding or tilting operations while rotating back and forth. In particular, the second section seat serves as a reference plane for the entire seat and acts as the center of the folding mechanism.

[0089] The second hinge connection part (132) consists of a plurality of hinge shafts, bearings, a bracket connection plate, and an angle limiting stopper. The hinge shafts are made of wear-resistant reinforced steel, and a plurality of ball bearings or needle bearings are inserted to reduce friction of the rotating shafts. The connection plate stably supports the rotating shafts, and reinforcing ribs are added at points where dynamic loads are concentrated.

[0090] The second hinge connecting part (132) is precisely designed with a folding angle limiting function. A ratchet-type angle control device is built into the hinge axis, allowing the user to adjust the seat in steps to a predetermined angle. When folding, a spring load stopper operates to prevent excessive rotation so that the hinge axis automatically stops at a specific position.

[0091] This hinge mechanism also includes an automatic locking function. When the seat is unfolded to the desired angle, the locking pin inside the hinge automatically engages to stop rotation. When folding is required, pulling the lever or pressing the button releases the lock, allowing for smooth folding. This design simultaneously satisfies both operational intuitiveness and safety.

[0092] The second hinge connecting part (132) includes a cushioning mechanism that absorbs shock during folding operation. A soft closing damper is installed at the end of the hinge shaft to prevent the seat from closing abruptly when folding is completed, thereby protecting the safety of the occupant and the vehicle's internal structure. In addition, the rigidity of the hinge shaft is maintained without deformation or wear even during long-term repetitive operation.

[0093] Detailed description of the hinge connection module (133)

[0094] The hinge connecting module (133) is a core folding mechanism that connects the front end of the second section sheet (122) and the rear end of the third section sheet (123). This module serves as a rotational center axis when the third section sheet performs a folding or unfolding operation, and is linked with the stacking guide link (134) during the folding process.

[0095] The hinge connection module (133) consists of a rotation axis, a bearing housing, a link connection part, an angle limiting stopper, and a cushioning device. The rotation axis is made of ultra-precision machined carbon steel or stainless steel, and the bearing housing has multiple bearings built in to reduce friction of the rotation axis. The link connection part is directly connected to the stacking guide link (134) to control the rotation direction and path of the third segment sheet during folding operation.

[0096] The angle limiting device of the hinge connection module (133) has a double safety structure consisting of a physical stopper and a ratchet-type position fixing device. It prevents excessive rotation during folding, and when folding is complete, it automatically locks to secure the seat without shaking. It also protects against exceeding a certain angle in the same way when unfolded.

[0097] The cushioning mechanism is designed to absorb shock and reduce noise upon completion of folding. Hydraulic dampers or high-elasticity rubber cushioning pads are applied to the ends of the hinge shafts, preventing shocks from being transmitted into the vehicle interior when the seat is closed or opened. This structure not only enhances durability but also provides the user with a smooth operating feel.

[0098] The hinge connection module (133) maintains high durability even with repeated use over a long period. The internal bearing is treated with a dustproof seal to protect it from contamination and moisture, and the exterior of the module is finished with a surface treatment that has excellent corrosion resistance and wear resistance. In addition, a grease injection port and a disassembly access panel are designed for maintenance, allowing for regular inspection and extending the lifespan.

[0099] Detailed description of the stacking guide link (134)

[0100] The stacking guide link (134) is a link mechanism connecting the rear end of the hinge binding module (133) and the third section sheet (123), and performs the function of guiding the third section sheet to be naturally stacked on top of the second section sheet during a folding operation.

[0101] The stacking guide link (134) is made of high-strength steel or aluminum alloy and simultaneously satisfies high tensile strength and lightweight properties. The link extends at a certain angle from the hinge connection module (133) to guide the movement of the third section sheet.

[0102] The stacking guide link (134) maintains high durability even with repeated folding and unfolding movements, and is treated with anti-corrosion and wear-resistant coating on the outside. In addition, the link structure is modularized so that it can be easily replaced when its lifespan is exhausted.

[0103] As explained above, the present invention can fundamentally solve the problems of backlash and structural play that occurred in cylinder motor-based folding drive structures, which were issues in the prior art. In cylinder motor systems, due to mechanical tolerances, play accumulates during repeated operations, and problems such as the seat shaking or becoming unstable frequently occurred. The present invention eliminates such motor-based drive structures and applies a dual recliner and hinge connection structure to implement physically robust folding operations, thereby dramatically improving structural stability.

[0104] The problem of shaking during folding is also effectively resolved by the present invention. In the prior art, since each part of the sheet operates around a single axis, shaking occurs because they do not interlock accurately with each other in the folded state. The present invention is designed such that the first, second, and third sections are each designed with an independent hinge connection structure, allowing each sheet to rotate and fold stably individually, and even after folding, the sheets are precisely stacked to maintain a robust structure without shaking.

[0105] The degree of freedom for seat adjustment according to the occupant's physical condition or purpose of use is significantly improved. While conventional seats operated with the backrest and seat surface as a single unit or allowed only limited reclining, the present invention utilizes a dual recliner structure in which the backrest and thigh support operate independently of each other. Consequently, users can finely adjust the seat to their desired angle or posture, thereby greatly enhancing seating comfort.

[0106] It also provides excellent results in terms of space utilization after folding. Conventional foldable seats have had problems such as difficulty optimizing space due to interference or gaps between seats during folding, and inefficient floor space remaining even when the seats are fully folded. By applying a stacking guide link structure, the third segmented seat is naturally stacked on top of the second segmented seat, and the first segmented seat is folded backward, allowing the entire seat to be stacked compactly. This enables the maximum securing of interior space in the vehicle.

[0107] The mounting fixing part of the present invention is composed of an LM guide type rail mounting module and a seat mounting module, allowing for natural and intuitive positional movement on the vehicle's original rail. Conventional electric drive structures were difficult to install and maintain and prone to frequent breakdowns due to increased weight, complex wiring, and control circuits, but the present invention is designed with a simple mechanical fastening structure, making installation easy and significantly simplifying maintenance.

[0108] In terms of durability, the present invention also provides a significant improvement over conventional technology. While electric motor-based seats inevitably experience performance degradation during long-term use due to issues such as motor lifespan, circuit noise, and battery voltage fluctuations, the present invention minimizes wear and performance degradation even during repeated folding operations by applying a purely mechanical hinge connection structure without a motor. In particular, the hinge and link are made of high-strength metal material to maintain stability even during long-term use.

[0109] In summary, the present invention solves all problems associated with conventional foldable single seats for vehicles, such as shaking, play, incomplete folding, poor space utilization, and inconvenience of maintenance. The dual recliner structure and multi-hinge connection system enable stable seat folding and space optimization within the vehicle, while simultaneously improving passenger convenience and safety. The present invention is an innovative foldable single seat for vehicles that simultaneously provides three effects: structural simplification, improved durability, and increased user convenience.

[0110] The above detailed description of the present invention describes only specific embodiments thereof. However, it should be understood that the present invention is not limited to the specific forms mentioned in the detailed description, but rather should be understood to include all variations, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims.

[0111] In other words, the present invention is not limited to the specific embodiments and descriptions described above, and any person skilled in the art to which the present invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications fall within the scope of protection of the present invention. Explanation of the symbols

[0112] 100: Foldable single seat for vehicles 110: Mounting fixing part 111: Rail-mounted module 112: Seat mounting module 113: Fixing bracket 120: Seat body 121: 1st Classification Sheet 122: 2nd Classification Sheet 123: Third Classification Sheet 130: Folding drive unit 131: First hinge connection 132: Second hinge connection 133: Hinge connection module 134: Stacked Induction Link A1: Center line of rotation of the first hinge connection part A2: Center line of rotation of the second hinge connection part A3: Rotation centerline of the hinge connection module

Claims

Claim 1 A mounting fixing part (110) having a structure that can be mounted and fixed on an original rail installed on the interior floor of a vehicle; a seat body part (120) mounted on the upper part of the mounting fixing part (110) and having a seat structure that supports the lower body and part of the upper body of a passenger, and having a structure in which a first segmented seat (121) supporting the back, a second segmented seat (122) supporting the buttocks, and a third segmented seat (123) supporting the thighs can each be folded independently; and a folding driving part (130) mounted on the upper part of the mounting fixing part (110) and operated by a user's control signal to drive the folding of each part constituting the seat body part (120); wherein the mounting fixing part (110) is seated on an original rail installed on the interior floor of a vehicle, is fixed by changing its position to a location desired by the user, and is equipped with an LM guide to change the position of the mounting fixing part (110) on the original rail within a preset range forward and backward; and a rail mounting module (111). and a seat mounting module (112) is mounted in an integrated structure on the upper part of the rail mounting module (111), and a folding drive unit (130) is mounted and fixed on the upper part, and a fixing bracket (113) supporting the hinge connection part of the folding drive unit (130) is mounted on both sides in a symmetrical form; wherein the folding drive unit (130) comprises: a first hinge connection part (131) which is mounted on the rear end of the fixing bracket (113), hinges the lower sides of the fixing bracket (113) and the first partition seat (121), and operates by a user's control signal to change the angle of the first partition seat (121); and a first hinge connection part (131) which is mounted on the front end of the fixing bracket (113), hinges the rear ends of the fixing bracket (113) and the second partition seat (122), and operates by a user's control signal. A second hinge connecting part (132) for changing the angle of the second section sheet (122); and a hinge connecting module (133) mounted on the front end of the second section sheet (122), hinge connecting both rear ends of the second section sheet (122) and the third section sheet (123), and operating by a user's control signal to change the angle of the third section sheet (123);The seat body part (120) includes: a second segmented seat (122) which is mounted on a second hinge connecting part (132) mounted on the front end of the fixed bracket (113) and extends forward by a predetermined length based on the second hinge connecting part (132) to form a seat structure capable of supporting the user's buttocks; and a first segmented seat (121) which is mounted on a first hinge connecting part (131) mounted on the rear end of the fixed bracket (113) and extends backward by a predetermined length based on the first hinge connecting part (131) to form a seat structure capable of supporting the user's back. A foldable single seat for a vehicle, comprising: a third segmented seat (123) which is mounted on a hinge binding module (133) mounted on the front end of the second segmented seat (122) and extends forward by a predetermined length relative to the hinge binding module (133) to form a seat structure capable of supporting the user's thigh; wherein the folding drive unit (130) is a link structure connecting the rear end of the hinge binding module (133) and the third segmented seat (123) to each other, and is a structure that extends by a predetermined length in one direction from the hinge binding module (133) and is bent and extended by a predetermined angle, and is a stacking guide link (134) which rotates by the rotational movement of the hinge binding module (133) to induce folding in a stacked form in which the third segmented seat (123) comes into contact with the upper surface of the second segmented seat (122). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete

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