A foldable children's dining chair

Abstract

This utility model provides a foldable children's dining chair, belonging to the technical field of children's dining chairs. The foldable children's dining chair includes a front leg frame, a rear leg frame, a seat, and a backrest, and also includes a rotating folding mechanism that rotatably connects the rear leg frame to the front leg frame. The rotating folding mechanism includes: a fixed seat, fixedly connected to the rear leg frame, having a transversely penetrating pivot hole and a guide cavity perpendicular to the axis of the pivot hole; a rotating arm, fixedly connected to the front leg frame and hinged to the fixed seat via a pivot; a limiting buckle, slidably placed in the guide cavity, with a locking protrusion at the front end and a spring seat at the rear end; an elastic reset member, placed between the bottom wall of the guide cavity and the spring seat; and an operation button, movably inserted on the side of the fixed seat opposite to the rotating arm. The locking protrusion automatically switches between a recess and an arc-shaped groove, solving the problem of complicated folding operation and unstable locking after unfolding in traditional children's dining chairs, realizing that it can be folded with a slight rotation of one hand at a small angle and automatically locked when released.

Description

Technical Field

[0001] This utility model belongs to the field of children's dining chair technology, specifically, it relates to a foldable children's dining chair. Background Technology

[0002] High chairs are essential support equipment for infants and toddlers during mealtimes. Their basic function is to allow short children to eat at the same table as adults, while using guardrails, footrests, and other accessories to limit the child's range of motion and reduce the risk of falls or tipping over. High chairs on the market generally fall into two categories: one is a fixed high chair made entirely of injection molding, with legs typically forming an "A" or "L" shape relative to the ground, relying on a large base area for stability; the other is a folding high chair designed for compactness. Commonly, this involves external hinges, slides, or latches under the legs or seat, allowing for easy folding, pulling, or insertion to reduce storage volume. However, while fixed high chairs are simple in structure and inexpensive, they have inherent drawbacks such as being unable to fold and occupying valuable family space. For families with limited living space, frequent floor cleaning, or multiple children needing to rotate use, these products are often too bulky, becoming difficult-to-move obstacles in the living room or dining room. While traditional folding designs nominally solve the storage problem, designers often focus on "whether it can be folded" rather than "how to fold it": exposed external hinges, protruding folding joints, complicated operation steps requiring both hands or feet, and even requiring users to bend over to the ground to align the latches. These interaction methods not only contradict the actual scenario of holding infants and toddlers but also create safety hazards such as pinching hands or feet, accidental folding, and forgetting to lock. More importantly, in order to save costs, traditional folding mechanisms often use simple hinges with metal plates and rivets, with a single-sided spring or purely manual latches for positioning. Although the number of parts is small, the force transmission path is long and the fit gaps are large. After a period of use, the hinges loosen and the latches wear out, resulting in failures such as "not folding properly" and "not locking securely." The chair legs wobble visibly when under stress, which exacerbates parents' resistance to the folding function. Utility Model Content

[0003] In view of this, the present invention provides a foldable children's dining chair that solves the problems of complicated folding operation and unstable locking after unfolding of traditional children's dining chairs, and realizes that it can be folded by a slight twist of one hand at a small angle and automatically locked when the hand is released.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a foldable children's dining chair, including a front leg frame, a rear leg frame, a seat, and a backrest, wherein: it also includes a rotating folding mechanism that rotatably connects the rear leg frame to the front leg frame;

[0006] The rotary folding mechanism includes:

[0007] The fixed base is fixed to the rear leg frame and has a transversely penetrating pivot hole and a guide cavity that is perpendicular to the axis of the pivot hole;

[0008] The rotating arm is fixed to the front leg frame and hinged to the fixed seat via a pivot. The end face of the rotating arm facing the fixed seat is provided with an arc-shaped groove, and the two ends of the arc-shaped groove form an opening recess and a folding recess, respectively.

[0009] The limiting buckle is slidably placed in the guide cavity, with a locking protrusion at the front end and a spring seat at the rear end;

[0010] The elastic reset element is placed between the bottom wall of the guide cavity and the spring seat. Continuous pushing of the limiting buckle keeps the locking protrusion inclined to be embedded in any recess.

[0011] The operation button is located on the side of the fixed base facing away from the rotating arm. Its inner end abuts against the rear end of the limit buckle, and its outer end is for the user to press to overcome the elastic reset element and release the lock.

[0012] The locking protrusion automatically switches between the recess and the arc-shaped slide, enabling stepless rotation and instantaneous positioning of the rear leg frame relative to the front leg frame in the open and folded states.

[0013] The technical advantages of this foldable children's dining chair are as follows: Through the integrated design of "limiting buckle and elastic reset part combined with arc-shaped slide groove", the rear leg frame can be unlocked instantly by pressing the button with one hand between the two extreme positions of opening and folding, and automatically locked when the hand is released. The storage steps are simplified to "one press and one turn", which solves the pain point of traditional folding dining chairs that require two hands and multiple steps to complete the folding. At the same time, the hidden arrangement avoids exposed gaps and improves the safety of children.

[0014] Based on the above technical solution, the foldable children's dining chair of this utility model can be further improved as follows:

[0015] The fixing seat is integrally embedded and hidden in the inner cavity of the end of the leg frame profile. Its outer contour is complementary to the inner cavity of the profile. A stop shoulder is provided around the opening of the guide cavity. A flange is provided on the outer periphery of the limiting buckle. The flange is restricted by the stop shoulder to prevent the limiting buckle from falling out of the guide cavity.

[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the fixed seat is embedded in the inner cavity of the front leg profile and the stop shoulder and flange are interlocked, so that the limit buckle cannot be released under reciprocating impact load. This ensures the strength of the mechanism and makes the shape without protrusion. After storage, the whole is a regular rectangle. The packaging volume is reduced by about 20% compared with the exposed hinge structure, and the transportation and storage costs are significantly reduced.

[0017] Furthermore, the top surface of the locking protrusion is a spherical crown surface, and the edge of the recess opening is provided with a guide chamfer. The spherical crown surface and the chamfer slide together, so that when the rear leg frame rotates, the locking protrusion can automatically slide out of the recess and slide along the arc-shaped groove.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the sliding pair design of the locking protrusion of the spherical crown and the chamfered concave groove creates a three-stage "convex-sliding-concave" feel during the rotation process, which allows users to perceive the position without visual inspection, avoids excessive force causing mechanical impact, extends service life, and reduces the risk of children's misoperation.

[0019] Furthermore, the elastic reset component is a helical compression spring, with one end of the helical compression spring sleeved on the short post at the rear end of the limit buckle, and the other end abutting against the bottom wall of the guide cavity, so that the limit buckle automatically resets and relocks after the button is released.

[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the spiral compression spring sleeve positioning structure ensures that the spring does not bend during the entire compression-release process, the button rebounds smoothly without jamming, and even after thousands of folds, it still maintains a return error of ≤1mm, ensuring that the high chair instantly enters a stable support state when it is reopened, thus improving parents' perception of the product's reliability.

[0021] Furthermore, the central angle corresponding to the arc-shaped groove of the rotating arm is an acute angle, so that the rear leg frame has a rotational stroke of less than 90 degrees between the open position and the folded position; in the open position, the rear leg frame and the front leg frame are supported in an "A" shape; in the folded position, the rear leg frame is close to the plane of the front leg frame.

[0022] The benefits of adopting the above-mentioned improved solution are as follows: the acute angle rotation stroke allows the rear legs to form a stable "A" shape support with only a small angle of downward swing. When folding, a slight upward lift is enough to fit the front legs. The entire opening and closing range is less than 90°, which can be completed by a single person in a narrow kitchen or dining room. This solves the problem that traditional large-angle folding requires a large space and is especially suitable for small apartments or families with two children for quick storage.

[0023] Furthermore, the outer periphery of the rotating arm is provided with axial protrusions, which are engaged with the axial grooves in the inner cavity of the rear leg frame profile, so that the rotating arm and the rear leg frame are circumferentially fixed and hidden at the end of the profile.

[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the rotating arm rib and the profile groove are inserted and matched to achieve "insertion and positioning" error-proof assembly. Production line workers can complete the fixing of the rotating arm and the rear leg within 5 seconds without additional tooling, reducing assembly time; at the same time, the hidden connection eliminates exposed screws, improving the integrity of the appearance and the high-end texture.

[0025] Furthermore, a dustproof skirt is provided between the operation button and the fixed base. The dustproof skirt surrounds the button rod and flexibly fits the outer wall of the fixed base to prevent foreign objects from entering the guide cavity.

[0026] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the dustproof skirt dynamically seals the annular gap between the button rod and the fixed seat, preventing food residue, milk powder dust and other dust from entering the guide cavity, solving the after-sales problems of button jamming and spring failure caused by foreign object intrusion in traditional folding chairs, reducing maintenance costs and extending the trouble-free service life.

[0027] Furthermore, both the front and rear leg frames are made of hollow metal profiles, with the fixed base and rotating arm completely embedded in the corresponding profile ends. Only the operating holes for the outer ends of the buttons are exposed on the profile surface, achieving a fully concealed arrangement of the rotating and folding mechanism.

[0028] The benefits of adopting the above-mentioned improvement scheme are as follows: the fully concealed layout eliminates any protruding parts on the outside of the dining chair, and the outer contour is a complete quadrilateral after folding, which can be directly inserted into a flat cardboard box without the need for additional foam filling, thus saving packaging materials; at the same time, it avoids the hinges from being bumped and deformed during transportation, increases customer traffic, and reduces the return rate of e-commerce channels.

[0029] Furthermore, the seat and backrest are fixed to the front leg frame, and a plate is detachably provided on the upper end of the front leg frame; the lower end of the rear leg frame is provided with an anti-slip pad. When the rear leg frame is in the open position, the anti-slip pad contacts the ground to form a stable triangular support; when the rear leg frame is in the folded position, the anti-slip pad flips up the rear leg frame and fits against the front leg frame, achieving overall flat storage.

[0030] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the triangular support and the anti-slip foot pad form a self-stabilizing structure when the chair is open, so that the chair body still maintains an inclination angle of ≤2° even when the child stands on one side; when folded, the foot pad flips up with the legs, avoiding the problem of traditional detachable foot pads being easily lost. Parents only need to press the button - push the back legs together - and put the chair against the wall to complete the storage. The whole process can be done with one hand without any pressure.

[0031] Furthermore, the limiting buckle, elastic reset component, operation button, and fixing base constitute an independently assembleable locking module. This locking module can be inserted into the end of the front leg frame profile at the end of the production line and fastened, realizing modular assembly and rapid after-sales replacement.

[0032] The benefits of adopting the above-mentioned improvement scheme are as follows: the locking module can be pre-installed as a whole and then inserted into the profile, realizing "modular" production and after-sales service; the assembly line cycle time is shortened, and only backup modules are needed in the inventory instead of the whole chair; if the button fails after long-term use, it can be replaced by the user in 5 minutes without returning it to the factory, which greatly reduces the brand's after-sales costs and improves the user experience.

[0033] Compared with existing technologies, the beneficial effects of this foldable children's dining chair are as follows: While maintaining the stable "A"-shaped projection of the chair legs, this invention moves the folding function inward to the profile cavity. Through the coordination of the limiting buckle and the elastic reset component, the rear legs form a complete closed loop of "instant unlocking—automatic reset—rigid locking" between the two extreme positions of opening and folding. When parents hold infants, they only need to press the button hidden inside the front leg with their thumb while slightly lifting the rear leg to complete the folding within an acute angle of less than 90 degrees. When unfolding again, there is no need to press again; simply pull the rear leg downwards, and the locking protrusion automatically slides into the open position under the guidance of the spherical surface and the chamfered recess, achieving "instant stability upon placement." Because the rotating arm and fixed seat are completely embedded in the hollow profile, all moving parts are wrapped by the metal wall, preventing infants' fingers from reaching in and completely eliminating the risk of pinching. After folding, the chair body is a flat plate that can stand upright against a wall or slide under a sofa, naturally blending with the furniture facade with minimal visual burden. Modular locking components can be inserted into the profile as a whole at the end of the production line, shortening the assembly cycle. After-sales service only requires replacing the module to restore functionality, significantly reducing the brand's maintenance costs. For family users, this product transforms "folding" from a deliberate task requiring bending over, using both hands, and multiple steps into a natural action that can be completed effortlessly while holding a baby, truly freeing up limited living space. At the same time, it ensures rigidity and stability in the unfolded state, giving the folding dining chair the same peace of mind as fixed products for the first time. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A perspective view of a foldable children's dining chair;

[0036] Figure 2 A front perspective view of a foldable children's dining chair;

[0037] Figure 3 for Figure 2 Enlarged perspective view of section A in the middle;

[0038] Figure 4 A folding perspective view of a foldable children's dining chair;

[0039] Figure 5 A perspective view of the rotating folding mechanism of a foldable children's dining chair;

[0040] The attached diagram lists the components represented by each number as follows:

[0041] 10. Front leg frame; 20. Rear leg frame; 30. Seat plate; 40. Backrest; 50. Rotating and folding mechanism; 51. Fixed base; 52. Rotating arm; 521. Arc-shaped slide groove; 53. Limit buckle; 54. Elastic reset component; 55. Operation button. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0043] like Figures 1-3 The figure shown is an example of a foldable children's dining chair provided by this utility model, including a front leg frame 10, a rear leg frame 20, a seat 30 and a backrest 40, wherein: it also includes a rotating folding mechanism 50 that rotatably connects the rear leg frame 20 to the front leg frame 10.

[0044] The rotating folding mechanism 50 includes:

[0045] The fixed seat 51 is fixed to the rear leg frame 20 and has a pivot hole that extends laterally and a guide cavity that is perpendicular to the axis of the pivot hole.

[0046] The rotating arm 52 is fixed to the front leg frame 10 and hinged to the fixed seat 51 via a pivot. The end face of the rotating arm 52 facing the fixed seat 51 is provided with an arc-shaped groove 521. The two ends of the arc-shaped groove 521 respectively form an opening recess and a folding recess.

[0047] Limiting buckle 53 is slidably placed in the guide cavity, with a locking protrusion at the front end and a spring seat at the rear end;

[0048] The elastic reset member 54 is placed between the bottom wall of the guide cavity and the spring seat, and continuously pushes the limiting buckle 53 to keep the locking protrusion embedded in any recess.

[0049] The operation button 55 is movably mounted on the side of the fixed base 51 facing away from the rotating arm 52. Its inner end abuts against the rear end of the limiting buckle 53, and its outer end is for the user to press to overcome the elastic reset member 54 and release the lock.

[0050] The locking protrusion automatically switches between the recess and the arc-shaped slide 521, enabling the rear leg frame 20 to rotate and be instantly positioned relative to the front leg frame 10 in the open and folded states.

[0051] The limit latch and the operation button are on the same sliding axis, and the inner end face of the operation button directly abuts the tail end of the limit latch. This axis is perpendicular to the pivot axis, so that the axial thrust generated by pressing the button is transmitted to the limit latch without deviation, pushing the limit latch to move backward in a straight line in the guide cavity of the fixed seat and compressing the elastic reset member, thereby instantly releasing the rotation lock.

[0052] like Figure 5 As shown, in the above technical solution, the fixing seat 51 is integrally embedded and hidden in the inner cavity of the end of the rear leg frame 20 profile. Its outer contour is complementary to the inner cavity of the profile. A stop shoulder is provided around the opening of the guide cavity. A flange is provided on the outer periphery of the limiting buckle 53. The flange is restricted by the stop shoulder to prevent the limiting buckle 53 from falling out of the guide cavity.

[0053] Furthermore, in the above technical solution, the top surface of the locking protrusion is a spherical crown surface, and the edge of the recess opening is provided with a guide chamfer. The spherical crown surface and the chamfer slide together, so that when the rear leg frame 20 rotates, the locking protrusion can automatically slide out of the recess and slide along the arc-shaped slide groove 521.

[0054] Furthermore, in the above technical solution, the elastic reset component 54 is a helical compression spring. One end of the helical compression spring is sleeved on the short post at the rear end of the limit buckle 53, and the other end abuts against the bottom wall of the guide cavity, so that the limit buckle 53 automatically resets and relocks after the button is released.

[0055] Furthermore, in the above technical solution, the central angle corresponding to the arc-shaped groove 521 of the rotating arm 52 is an acute angle, so that the rear leg frame 20 has a rotational stroke of less than 90 degrees between the open position and the folded position; in the open position, the rear leg frame 20 and the front leg frame 10 are supported in an "A" shape; in the folded position, the rear leg frame 20 is close to the plane where the front leg frame 10 is located.

[0056] Furthermore, in the above technical solution, the outer periphery of the rotating arm 52 is provided with an axial protrusion rib, which is inserted into the axial groove of the inner cavity of the rear leg frame 20 profile, so that the rotating arm 52 and the rear leg frame 20 are circumferentially fixed and hidden at the end of the profile.

[0057] Furthermore, in the above technical solution, a dustproof skirt is provided between the operation button 55 and the fixed base 51. The dustproof skirt surrounds the button rod and flexibly fits against the outer wall of the fixed base 51 to prevent foreign objects from entering the guide cavity.

[0058] Furthermore, in the above technical solution, both the front leg frame 10 and the rear leg frame 20 are made of hollow metal profiles. The fixed base 51 and the rotating arm 52 are completely embedded in the corresponding profile ends. Only the operating hole for the outer end of the button is exposed on the profile surface, so as to realize the fully hidden arrangement of the rotating folding mechanism 50.

[0059] Examples of hollow metal profile materials are as follows:

[0060] Aluminum alloy oval, round, and rectangular tubes are lightweight, have low extrusion mold costs, and offer scratch-resistant surfaces and a variety of colors after anodizing, making them the most widely used solution in the children's high chair industry. Carbon structural steel rectangular / square welded tubes are low-cost and have good rigidity. Stainless steel hollow tubes offer the highest corrosion resistance and can be used directly outdoors or in high-humidity environments. Magnesium alloy extruded tubes are lighter than aluminum and have good shock absorption.

[0061] like Figure 4 As shown, further, in the above technical solution, the seat 30 and backrest 40 are fixed to the front leg frame 10, and the upper end of the front leg frame 10 is detachably provided with a plate; the lower end of the rear leg frame 20 is provided with an anti-slip pad. When the rear leg frame 20 is in the open position, the anti-slip pad contacts the ground to form a stable triangular support; when the rear leg frame 20 is in the folded position, the anti-slip pad flips up the rear leg frame 20 and fits against the front leg frame 10 to achieve overall flat storage.

[0062] The seat and backrest are fixed using a combination of "sliding grooves, tongues, and screws": A horizontal tongue extends from the left and right sides of the bottom surface of the seat, and a horizontal sliding groove is punched at the corresponding position on the front leg frame. After the tongue is pushed into place along the sliding groove, a self-tapping screw passes through the bottom wall of the sliding groove from bottom to top and screws into the metal insert on the edge of the seat, forming a rigid connection that is detachable but not rotatable. Tongues also extend from both sides of the backrest, inserting into pre-set vertical slots on the upper part of the front leg frame, and are then locked with two hidden screws, allowing for quick replacement of the backrest even though the tilt angle is not adjustable. The plate is fixed using a "hook-locking tongue" quick-release structure: Elastic hooks are located on the left and right sides of the rear end of the plate, hooking onto the top horizontal tube of the front leg frame from top to bottom. A locking tongue that can slide back and forth is located at the bottom of the front end, with a handle at the front end of the locking tongue. When the hook is securely attached, the locking tongue automatically extends under the action of a return spring and engages with the corresponding hole in the horizontal tube, completing three-point positioning. Pressing the handle unlocks the plate and allows it to be lifted upwards. No tools are required throughout the process, meeting the needs for quick assembly and disassembly for cleaning or storage.

[0063] Furthermore, in the above technical solution, the limit buckle 53, the elastic reset component 54, the operation button 55 and the fixing seat 51 constitute an independently assembleable locking module. This locking module can be inserted into the end of the front leg frame 10 profile at the end of the production line and fastened, realizing modular assembly and rapid after-sales replacement.

[0064] First Embodiment: This embodiment uses elliptical cross-section aluminum profiles as the front and rear legs. The fixing seat is inserted into the lower end of the front leg with an interference fit, and its guide cavity opening faces rearward; the rotating arm is locked to the inner end face of the rear leg by two radial screws. The pivot is made of stainless steel hollow rivets, which pass through the fixing seat and the flanges at both ends of the rotating arm to form a permanent hinge. The limiting buckle is tongue-shaped, with a hemispherical locking protrusion at the front end and a short post at the rear end; a helical compression spring is sleeved on the short post and abuts against the bottom wall of the guide cavity. An arc-shaped groove is opened on the end face of the rotating arm, and spherical recesses are milled at both ends of the groove, with chamfered edges. The operating button is a plastic-coated part, with the rod passing through the central hole of the rear wall of the fixing seat and making point contact with the rear end face of the limiting buckle. A flexible skirt is provided at the base of the rod, which can elastically deform with the reciprocating motion of the button, always keeping the central hole closed.

[0065] This design is suitable for the high-frequency "open during meals - fold after meals" cycle that occurs twice daily in urban families: in the morning, parents need to quickly clear the dining room floor while holding the baby in one arm and cooking with the other; after meals, the baby needs to be quickly opened for lunch. The acute-angle travel of this design, combined with a hidden button, allows parents to fold the baby within ten seconds by simply pressing with their thumb and slightly lifting the rear leg. To open the baby again, no pressing is required; simply pull down the rear leg, and the locking protrusion automatically slides into the opening recess, emitting a soft "click" sound to indicate that it has been reliably locked. The line contact between the hemispherical locking surface and the spherical recess results in extremely low wear; after 5,000 cycles, the recess depth changes by less than 5%, maintaining the same feel as on the first day. The flexible skirt prevents food particles and milk stains from entering the guide cavity, avoiding spring jamming and significantly reducing maintenance frequency.

[0066] With the hinges completely hidden, the chair's sway angle when unfolded is less than that visible to the naked eye, achieving the same lateral rigidity as a fixed dining chair. When folded, its thickness is equal to the height of a single elliptical profile, allowing it to stand upright against the side seam of a cabinet, occupying less than ten centimeters of width, leaving a passage for vacuum cleaners, play mats, etc., and realizing a compact lifestyle rhythm of "unfolding when needed and folding when not in use".

[0067] Second Embodiment: In this embodiment, the profile is replaced with a rectangular hollow steel tube, resulting in a square appearance suitable for mixing and matching with Nordic-style wooden dining chairs. The fixed base and rotating arm are replaced with zinc alloy die-cast parts: the outer wall of the fixed base has longitudinal ribs that fit into the stamped grooves inside the steel tube, preventing rotation without screws; the outer wall of the rotating arm also has ribs, which fit into the inner cavity of the rear leg steel tube and are permanently fixed by a laterally driven elastic cylindrical pin. The structure of the limit buckle and elastic reset component is the same as in Embodiment 1, but the button is changed to a metal material with a brushed surface flush with the steel tube, resulting in a stronger visual integrity. The arc-shaped groove and recess are directly formed on the end face of the zinc alloy rotating arm, and the dimensional accuracy is guaranteed by the mold, eliminating the need for secondary machining.

[0068] This chair is suitable for low-frequency but highly mobile needs such as "car transport - temporary meals" during weekend outings: parents fold the high chair and put it in the car trunk, then quickly unfold it for the child's lunch upon arrival at the countryside or grandparents' house. The rectangular steel tube cross-section provides higher torsional rigidity, ensuring stability on outdoor lawns and uneven tiled surfaces; the zinc alloy die-cast rotating arm is 20% thinner than aluminum parts, reducing the overall weight by about 300 grams, making it easier to carry. Because the button is flush with the steel tube surface, it will not snag on the trunk carpet or surrounding items during loading. When unfolding, parents hold the backrest with one hand and gently pull down the rear leg with the other; the locking protrusion automatically engages and emits a crisp metallic sound, indicating that locking is complete. When folding, the same method applies: pressing the flush button with one hand and lifting the rear leg instantly flattens the chair, allowing it to be inserted vertically into the side wall of the trunk, placed alongside a stroller and folding table without taking up extra space.

[0069] The high density of zinc alloy reduces the pressure on the bearing surface of the recess, resulting in minimal deformation of the recess after long-term use and maintaining a "crisp" locking feel. The mating surface between the rectangular steel tube and the die-cast part forms a closed force flow, ensuring stability and preventing wobbling even in light outdoor winds or when children push against it from the side. This achieves a convenient travel experience of "ready to go in the car and ready to use on the ground," while maintaining the same hidden safety and modular maintenance advantages as in Example 1.

[0070] Specifically, the principle of this utility model is as follows: The core of this utility model lies in integrating the three elements of "rotation, limiting, and resetting" into the same radial plane and concealing them within the profile cavity. The fixed seat is fixed to the front leg, and the rotating arm is fixed to the rear leg, forming a revolute joint through a transverse pivot. A guide cavity perpendicular to the pivot plane is opened in the fixed seat, and the limiting buckle forms a sliding joint within the cavity. The elastic resetting member continuously pushes the buckle towards the rotating arm, ensuring that the locking protrusion at its front end always tends to embed into the recess on the end face of the rotating arm. When the rear leg is in the open state, the locking protrusion falls into the open recess. At this time, the angle between the pushing direction of the elastic resetting member and the normal direction of the recess sidewall is zero, forming a self-locking mechanism. Any external force attempting to rotate the rear leg upward must simultaneously overcome the elastic pushing force and the constraint of the recess sidewall, thus achieving an unfolding stiffness comparable to that of a fixed dining chair. When folding is needed, the parent holds the front leg with one hand and presses the button with their thumb. The inner end of the button pushes the limit buckle backward, and the locking protrusion exits the recess axially and compresses the elastic reset component. At this time, the rotating arm loses its circumferential constraint, and the rear leg can flip upward within the acute angle stroke. The locking protrusion slides along the arc-shaped groove. After reaching the folding recess, the thumb is released, and the elastic reset component pushes the buckle forward again, causing the locking protrusion to fall into the folding recess, completing the folding and locking process. When unfolding again, since there is also a spherical crown surface and chamfer between the opening recess and the groove, the parent does not need to press the button. They can simply pull the rear leg downward, and the locking protrusion automatically exits the folding recess under the action of the inclined surface and slides back to the opening recess along the groove, achieving "buttonless unfolding". Throughout the process, the sliding axis of the limit buckle and the pivot axis are always perpendicular to each other, and the force system is closed inside the fixed seat. Only a dustproof skirt is left on the outer wall of the profile, which dynamically fits the button rod, preventing food residue from entering and avoiding button shaking and abnormal noise. By limiting the rotation range to an acute angle, the center of gravity of the hind legs moves along a short path, allowing parents to operate the chair without moving their body or flipping their wrists, which meets the ergonomic requirements of holding a baby. At the same time, the small-angle rotation shortens the length of the arc-shaped slide and reduces the thickness of the rotating arm, allowing it to be completely hidden inside the cavity of a conventional hollow metal profile without the need for additional thickening or slotting, ensuring the chair's simple and lightweight appearance.

Claims

1. A foldable children's dining chair, comprising a front leg frame, a rear leg frame, a seat, and a backrest, characterized in that: It also includes a rotating folding mechanism that rotatably connects the rear leg frame to the front leg frame; The rotary folding mechanism includes: The fixed base is fixed to the rear leg frame and has a transversely penetrating pivot hole and a guide cavity that is perpendicular to the axis of the pivot hole; The rotating arm is fixed to the front leg frame and hinged to the fixed seat via a pivot. The end face of the rotating arm facing the fixed seat is provided with an arc-shaped groove, and the two ends of the arc-shaped groove form an opening recess and a folding recess, respectively. The limiting buckle is slidably placed in the guide cavity, with a locking protrusion at the front end and a spring seat at the rear end; The elastic reset element is placed between the bottom wall of the guide cavity and the spring seat. Continuous pushing of the limiting buckle keeps the locking protrusion inclined to be embedded in any recess. The operation button is located on the side of the fixed base facing away from the rotating arm. Its inner end abuts against the rear end of the limit buckle, and its outer end is for the user to press to overcome the elastic reset element and release the lock. The locking protrusion automatically switches between the recess and the arc-shaped slide, enabling stepless rotation and instantaneous positioning of the rear leg frame relative to the front leg frame in the open and folded states.

2. A foldable children's dining chair according to claim 1, characterized in that, The fixing seat is integrally embedded and hidden in the inner cavity of the rear leg frame profile end. Its outer contour is complementary to the inner cavity of the profile. A stop shoulder is provided around the opening of the guide cavity. A flange is provided on the outer periphery of the limiting buckle. The flange is restricted by the stop shoulder to prevent the limiting buckle from falling out of the guide cavity.

3. A foldable children's dining chair according to claim 2, characterized in that, The top surface of the locking protrusion is a spherical crown surface, and the edge of the recess opening is provided with a guide chamfer. The spherical crown surface and the chamfer slide together, so that when the rear leg frame rotates, the locking protrusion can automatically slide out of the recess and slide along the arc-shaped groove.

4. A foldable children's dining chair according to claim 3, characterized in that, The elastic reset component is a helical compression spring. One end of the helical compression spring is sleeved on the short post at the rear end of the limit buckle, and the other end abuts against the bottom wall of the guide cavity, so that the limit buckle automatically resets and relocks after the button is released.

5. A foldable children's dining chair according to claim 4, characterized in that, The central angle corresponding to the arc-shaped groove of the rotating arm is an acute angle, so that the rear leg frame has a rotational stroke of less than 90 degrees between the open position and the folded position; in the open position, the rear leg frame and the front leg frame are supported in an "A" shape; in the folded position, the rear leg frame is close to the plane of the front leg frame.

6. A foldable children's dining chair according to claim 5, characterized in that, The rotating arm has an axial rib on its outer periphery. The rib is inserted into the axial groove of the inner cavity of the rear leg frame profile, so that the rotating arm and the rear leg frame are circumferentially fixed and hidden at the end of the profile.

7. A foldable children's dining chair according to claim 6, characterized in that, A dustproof skirt is provided between the operation button and the fixed base. The dustproof skirt surrounds the button rod and flexibly fits the outer wall of the fixed base to prevent foreign objects from entering the guide cavity.

8. A foldable children's dining chair according to claim 7, characterized in that, Both the front and rear leg frames are made of hollow metal profiles. The fixed base and the rotating arm are completely embedded in the corresponding ends of the profiles. Only the operating holes for the outer ends of the buttons are exposed on the surface of the profiles, thus achieving a fully concealed arrangement of the rotating and folding mechanism.

9. A foldable children's dining chair according to claim 8, characterized in that, The seat and backrest are fixed to the front leg frame, and a plate is detachably provided on the upper part of the front leg frame. The lower part of the rear leg frame is provided with an anti-slip pad. When the rear leg frame is in the open position, the anti-slip pad contacts the ground to form a stable triangular support. When the rear leg frame is in the folded position, the anti-slip pad flips up the rear leg frame and fits against the front leg frame, achieving overall flat storage.

10. A foldable children's dining chair according to claim 9, characterized in that, The limiting buckle, elastic reset component, operation button and fixing seat constitute an independently assembleable locking module. This locking module can be inserted into the end of the front leg frame profile and fastened at the end of the production line, realizing modular assembly and rapid after-sales replacement.

Images