Child chair with support function

Abstract

The utility model belongs to the field of children's chair, provide a children's chair with support function, include: foreleg and back leg, foreleg inside is provided with the bearing groove, and the end of bearing groove forms the opening to the chair back, back leg swing joint is in foreleg, and can switch between the unfolded position and the folding position of foreleg. Compared with prior art, the utility model has the advantages that through the cooperation of extension block and bearing block, the stable support of the seat plate in the first position can be ensured, the contact length of the seat plate and the bearing groove can be increased when the seat plate is in the second position, the load force of the seat plate is effectively shared, the overall structural strength and use stability of the seat plate are improved, and at the same time, the isosceles support structure is formed when the foreleg and the back leg are in the folding position, the center of gravity is centered and the stress is balanced in the folding position, the folding position is realized after the folding position is kept balanced, and the phenomenon that the traditional folding position needs to rely on external support is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of children's chairs, specifically relating to a children's chair with a support function. Background Technology

[0002] Children's folding chairs are portable seating devices designed specifically for infants and preschool children. They combine safety, comfort, and convenient storage. Their core feature is the use of a foldable support structure, which provides stable and reliable sitting support when unfolded, and is compact and easy to carry and store when folded. They are widely used in various scenarios such as homes, kindergartens, outdoor picnics, travel, camping, and performances.

[0003] Currently, most children's chairs on the market use a fixed seat design, which cannot be adjusted. Furthermore, in some adjustable seat structures, the position of the seat relative to the legs cannot guarantee absolute stability, making it prone to wobbling or tilting, thus affecting user safety and experience. In addition, existing folding chairs generally have the legs parallel or stacked together when folded, requiring external support (such as a wall) to prevent them from forming an independent standing structure. This limits their usability and impacts user convenience and experience. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a children's chair with a simple structure and improved support rigidity and stability.

[0005] The purpose of this utility model can be achieved by addressing the following technical problem: providing a child chair with a support function, comprising: a front leg and a rear leg, wherein a support groove is provided on the inner side of the front leg, and an opening is formed at the end of the support groove facing the backrest; the rear leg is movably connected to the front leg and can be switched between an extended position and a folded position of the front leg;

[0006] An unlocking mechanism is provided inside the hind leg. The unlocking mechanism is used to restrict the hind leg to the unfolded position and guide the hind leg to rotate to the folded position, so that an angle is formed between the front leg and the hind leg, so that the distance from the rotation center of the hind leg to the bottom of the front leg and the hind leg is equal respectively.

[0007] At least one seat, the seat being switchable between a first position and a second position of the front leg, the sidewall of the seat having a support block that is movably engaged in the support groove;

[0008] An extension mechanism and a locking mechanism are provided on the seat plate. The extension mechanism includes an extension block that is engaged in the bearing groove and movably abuts against the bearing block. The locking mechanism is movably inserted into the front leg to restrict the seat plate to the first position or the second position.

[0009] When the seat is in the first position, the support block and the extension block are completely housed in the support groove, and the support block and the extension block abut against each other; when the seat moves from the first position to the second position, the end of the support block extends out of the support groove along the opening direction, and the extension block moves in a direction away from the opening, so that the extension block and the support block are arranged at intervals in the support groove.

[0010] In the aforementioned child chair with support function, the extension mechanism further includes:

[0011] The limiting slider is provided, wherein the seat plate includes a support base connected to its bottom wall, the support block is connected to the support base and extends out of the seat plate, and the limiting slider is slidably disposed inside the support base;

[0012] A connecting block is connected to the limiting slider. A limiting hole is formed on the outer wall of the bearing seat. The connecting block movably passes through the limiting hole and is connected to the extension block.

[0013] An elastic element, one end of which is connected to the bearing seat and the other end of which is connected to the limiting slider.

[0014] In the aforementioned child chair with support function, an eccentric shaft is provided on the rear leg, the eccentric shaft is movably connected to the front leg, and the rotation center of the eccentric shaft deviates from the symmetrical center line of the rear leg in its length direction, and coincides with the symmetrical center line of the front leg in its length direction.

[0015] In the aforementioned child chair with a support function, an extension plate is also formed at the end of the extension block away from the support block.

[0016] In the aforementioned child chair with support function, the locking mechanism includes:

[0017] A drive block and a locking pin are movably disposed within the bearing seat. The drive block is connected to the locking pin so as to drive the locking pin through the extension block along its axial direction and movably insert it into the front leg.

[0018] The unlocking slider is movably disposed within the support base, and the driving block is movably engaged within the unlocking slider, so that when the unlocking slider slides along the radial direction of the locking pin, it pulls the driving block together with the locking pin to disengage from the front leg.

[0019] A reset spring, one end of which is connected to the bearing seat and the other end of which is connected to the drive block.

[0020] In the aforementioned child chair with support function, the unlocking slider is provided with a traction hole at an angle, and the drive block is formed with a traction block, which is movably engaged in the traction hole.

[0021] In the aforementioned child chair with support function, a track plate is installed inside the front leg, and an arc-shaped guide hole is formed inside the track plate. A guide block is formed on the rear leg, and the guide block is movably engaged in the arc-shaped guide hole.

[0022] In the aforementioned child chair with support function, the unlocking mechanism includes:

[0023] Unlock the lever; the active setting is located inside the rear leg.

[0024] A locking spring is provided, wherein a protrusion is formed at the end of the unlocking lever, one end of the locking spring is connected to the protrusion, and the other end is connected to the inner wall of the rear leg.

[0025] The unlocking post has a track groove inside the track plate. One end of the unlocking post is connected to the unlocking lever, and the other end is movably engaged in the track groove.

[0026] In the aforementioned child chair with support function, the track groove includes a locking part and a guide part. When the unlocking pin is engaged in the locking part, it can restrict the rear leg to the unfolded position. The guide part and the locking part are arranged at an angle and communicate with each other to guide the rear leg to rotate relative to the front leg to the folded position around the axis of the eccentric shaft.

[0027] In the aforementioned child chair with support function, a guide hole is also formed on the rear leg. One end of the guide hole coincides with the locking part, and the other end is located at the opening of the guide part. The unlocking pin passes through the guide hole and can slide back and forth inside it.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The present invention provides a child chair with a support function. Through the coordinated cooperation of the extension block and the bearing block, it can not only ensure the stable support of the seat in the first position, but also increase the contact length between the seat and the bearing groove when the seat is in the second position. This effectively distributes the load force of the seat and improves the overall structural strength and stability of the seat. Moreover, the child chair utilizes the front and rear legs to form an isosceles support structure when folded, ensuring that the center of gravity is centered and the force is balanced when folded. This allows the chair to maintain its balance after folding, avoiding the need to rely on external objects for support after folding, thus expanding the application scenarios and improving the user's convenience and experience.

[0030] (2) The extended support plate can provide additional support area or contact surface when the seat is in the second position, further enhancing the load-bearing capacity and bending resistance of the front end of the seat, and effectively improving the overall structural strength and comfort of the seat.

[0031] (3) The guide hole provides additional motion constraints for the unlocking post, improving its accuracy and stability in the track groove; on the other hand, it plays an auxiliary guiding role in the folding process, preventing the unlocking post from coming out or getting stuck, further enhancing the reliability and durability of the folding mechanism. Attached Figure Description

[0032] Figure 1 This is a structural diagram of the child chair in its unfolded position;

[0033] Figure 2 This is a schematic diagram of the installation structure of the locking mechanism and the extension mechanism within the support base;

[0034] Figure 3 This is a schematic diagram of the structure when the extension block and the load-bearing block are separated;

[0035] Figure 4 yes Figure 1 Enlarged view of section A in the image;

[0036] Figure 5 This is a structural diagram of the child chair in the folded position;

[0037] Figure 6 This is a structural diagram of the forelegs;

[0038] Figure 7 This is a structural diagram of the hind leg;

[0039] Figure 8 This is a schematic diagram of the unlocking mechanism;

[0040] Figure 9 This is a structural diagram showing the center of rotation of the hind legs.

[0041] In the figure, 1 is the front leg; 10 is the bearing groove; 100 is the opening; 101 is the first locking hole; 102 is the second locking hole; 11 is the track plate; 110 is the arc-shaped guide hole; 111 is the track groove; 111a is the locking part; 111b is the guide part; and 12 is the connecting hole.

[0042] 2. Rear leg; 20. Eccentric shaft; 21. Guide block; 22. Guide hole; 23. Limiting groove;

[0043] 3. Unlocking mechanism; 30. Unlocking lever; 300. Protrusion; 301. Extension handle; 31. Locking spring; 32. Unlocking pin;

[0044] 4. Seat plate; 40. Support seat; 400. Support block; 401. Limiting hole; 402. Arc-shaped protrusion;

[0045] 5. Extension mechanism; 50. Extension block; 500. Extension support plate; 501. Arc-shaped groove; 51. Limiting slider; 52. Elastic element;

[0046] 6. Locking mechanism; 60. Drive block; 600. Traction block; 61. Locking pin; 62. Unlocking slider; 620. Traction hole; 63. Return spring. Detailed Implementation

[0047] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] like Figures 1 to 9 As shown, this utility model discloses a children's chair with a support function, characterized in that it includes a front leg 1, a rear leg 2, an unlocking mechanism 3, at least one seat 4, an extension mechanism 5, and a locking mechanism 6.

[0050] The front leg 1 has a support groove 10 on its inner side, and the end of the support groove 10 forms an opening 100 facing the backrest; the rear leg 2 is movably connected to the front leg 1 and can be switched between an extended position and a folded position; the unlocking mechanism 3 is located in the rear leg 2, which is used to restrict the rear leg 2 to the extended position and guide the rear leg 2 to rotate to the folded position, so that an angle is formed between the front leg 1 and the rear leg 2, so that the distance from the rotation center of the rear leg 2 to the bottom of the front leg 1 and the rear leg 2 are equal; the seat 4 can be switched between a first position and a second position of the front leg 1, and a support block 400 is formed on the side wall of the seat 4, which is movably engaged in the support groove 10; the extension mechanism 5 and the lock The stopping mechanism 6 is disposed on the seat plate 4. The extension mechanism 5 includes an extension block 50, which is engaged in the bearing groove 10 and movably abuts against the bearing block 400. The locking mechanism 6 is movably inserted into the front leg 1 to restrict the seat plate 4 to a first position or a second position. When the seat plate 4 is in the first position, the bearing block 400 and the extension block 50 are completely housed in the bearing groove 10 and abut against each other. When the seat plate 4 moves from the first position to the second position, the end of the bearing block 400 extends out of the bearing groove 10 along the direction of the opening 100, and the extension block 50 moves in the direction away from the opening 100, so that the extension block 50 and the bearing block 400 are spaced apart in the bearing groove 10.

[0051] It is worth noting that, such as Figure 1 As shown, in this embodiment, several bearing grooves 10 are evenly distributed on the front leg 1. By snapping the seat 4 into the bearing grooves 10 at different heights, it can be flexibly adjusted according to users of different heights. Similarly, in this embodiment, the seat 4 can be one, two, or even more. One seat 4 can provide a resting service for the user, while in the case of two seats 4 (e.g., ... Figure 1 As shown), the lower seat 4 can be used as a footrest to further enhance user comfort. Furthermore, the opening 100 of each support groove 10 faces the backrest (and each support groove 10 can be slightly tilted towards the front of the chair), meaning the seat 4 needs to gradually extend from the backrest into the support groove 10, effectively preventing the seat 4 from slipping during use. Different users can adjust the position of the seat 4 on the chair legs according to their needs. Specifically, when the seat 4 is located near the front of the seat (i.e., the seat 4 is in the first position), the extension block 50 is located... Figure 4 At the leftmost end of the bearing groove 10 shown, simultaneously, due to the adjustment of the position of the seat plate 4, the bearing block 400 on the side wall of the seat 2 is fully embedded in the bearing groove 10 until the bearing block 400 abuts against the extension block 50 (see reference). Figure 2As shown in the diagram, with the unlocking mechanism 3 locking the seat 4, the supporting force of the seat 4 can be stably supported by the extension block 50 together with the support block 400. After the user releases the lock on the seat 4 by moving the unlocking mechanism 3, the seat 4 can move towards the back of the chair along the opening 100 of the support groove 10. As the front end of the support block 400 extends to... Figure 4 Outside the right opening 100 of the bearing groove 10 shown, the extension block 50 is displaced in the opposite direction of the movement of the opening 100 under the force of the extension mechanism 5 (that is, the extension block 50 does not move synchronously with the bearing block 400, but moves in the direction away from the movement of the bearing block 400), until the extension block 50 and the bearing block 400 are at an angle. Figure 3 In the state shown, the seat 4 reaches the predetermined second position. Since the rear end of the support block 400 (the end near the extension block 50) is still located within the support groove 10, it forms an extended support point with the extension block 50, which is separated from the support block 400, thus providing additional support area. The two work together to increase the contact length between the seat 4 and the support groove 10, and also share the load force of the seat 4, improving the overall structural strength and stability of the seat 4. Therefore, this structure not only improves the flexibility of the seat 4 but also enhances the load-bearing capacity and safety of the seat 4 when switching positions, making it particularly suitable for scenarios such as children's chairs where safety and adjustability are highly required. In addition, this embodiment also utilizes the rear legs 2 in conjunction with the locking mechanism 6 to achieve an isosceles support structure after folding, that is, the rotation center of the rear legs 2 (i.e., Figure 5 or Figure 9 The distance L1 from point B in the diagram to the bottom of the front leg 1 is equal to the distance L2 from the rotation center of the rear leg 2 to the bottom of the rear leg 2 (i.e., L1 = L2, forming an isosceles triangle support structure), ensuring that the center of gravity is centered and the force is balanced when folded. Compared with traditional chairs where the legs need to be supported by external objects (such as walls) after folding, this solution enables the chair to maintain its balance posture independently after folding, effectively improving the overall support stability and ease of use of the children's chair.

[0052] The extension mechanism 5 also includes: a limiting slider 51; the seat plate 4 includes a support base 40 connected to its bottom wall; a support block 400 is connected to the support base 40 and extends out of the seat plate 4; the limiting slider 51 is slidably disposed inside the support base 40; a connecting block 52 is connected to the limiting slider 51; a limiting hole 401 is formed on the outer wall of the support base 40; the connecting block 52 movably passes through the limiting hole 401 and is connected to the extension block 50; and an elastic member 53, one end of which is connected to the support base 40 and the other end of which is connected to the limiting slider 51.

[0053] like Figures 2 to 4As shown, in this embodiment, the support seat 40 can be connected to the bottom wall of the seat plate 4 by screws, bolts, or other components. Under normal use (i.e., when the seat plate 4 is in the first position), the elastic element 53 is in the released state. As the support block 400 gradually extends into the support groove 10, the extension block 50 abuts against the support. Figure 4 At the leftmost end of the bearing groove 10 shown, as the bearing block 400 gradually approaches, the extension block 50 is subjected to the squeezing force of the inner wall of the bearing groove 10, which is transmitted to the elastic member 53 through the limiting slider 51, so that the elastic member 53 is gradually compressed to ensure that the bearing block 400 can move and fit tightly against the extension block 50 (reference). Figure 2 (The structure shown); while Figure 2 As the right end of the supporting block 400 gradually moves outward from the opening 100 of the supporting groove 10, the compressive force of the elastic element 53 is gradually released, thereby driving the limiting slider 51 to move. Ultimately, the extension block 50 and the supporting block 400 are spaced within the supporting groove 10, effectively preventing the seat plate 4 in the second position from wobbling or tilting due to insufficient support. This significantly improves the overall support strength of the seat plate 4, ensuring user safety and stability. It should be noted that the elastic element 53 in this embodiment can be replaced by other elastic devices such as compression springs or return springs 63.

[0054] Preferably, such as Figures 2 to 4 As shown, in this embodiment, an extension support plate 500 is added to the end of the extension block 50 away from the bearing block 400. The extension support plate 500 can extend outward to form an additional support structure (providing a larger support contact surface or auxiliary support point) when the seat 4 is in the second position. This further increases the contact length between the extension block 50 and the bearing groove 10, avoids insufficient overall force on the seat 4 and the phenomenon of shaking, enhances the overall anti-overturning ability of the seat, improves the load-bearing capacity and comfort of the seat in the extended state, and ensures the stability, comfort and safety of the user's (especially children's) sitting posture.

[0055] More preferably, such as Figure 2 and Figure 3 As shown, in this embodiment, an arc-shaped groove 501 is provided at the end of the extension block, and an arc-shaped protrusion 402 is provided at the end of the bearing block 400. By relying on the two to move and fit together, not only is the contact area increased, but stress concentration when they are pressed together is also reduced, which avoids the extension block 50 or the bearing block 400 from breaking during the frequent adjustment of the seat plate 4. This enhances the positioning accuracy and structural stability between the two, prevents abnormal noise or wear caused by shaking or displacement, and extends the service life of the product.

[0056] The locking mechanism 6 includes: a drive block 60 and a locking pin 61, which are movably disposed within the support base 40. The drive block 60 is connected to the locking pin so as to drive the locking pin 61 to pass through the extension block 50 along its axial direction and be movably inserted into the front leg 1; an unlocking slider 62, which is movably disposed within the support base 40. The drive block 60 is movably engaged within the unlocking slider 62 so that when the unlocking slider 62 slides along the radial direction of the locking pin 61, it pulls the drive block 60 and the locking pin 61 to disengage from the front leg 1; and a return spring 63, one end of which is connected to the support base 40 and the other end of which is connected to the drive block 60.

[0057] like Figure 2 As shown, when the user moves the unlock slider 62 along... Figure 2 When moving to the right, the drive block 60 can be pulled along... Figure 2 Moving downwards causes the return spring 63 to gradually contract, which in turn drives the locking pin 61 to disengage from the front leg 1 along its axis and retract into the support seat 40. At this time, the seat 4 can switch between the first position and the second position. When the desired position is reached, as the user releases the tension on the unlocking slider 62, the drive block 60 can push the locking pin 61 back into the front leg 1 under the elastic reset force of the return spring to complete the locking state. Therefore, this embodiment utilizes the combined structure of the drive block 60, the locking pin 61, the unlocking slider 62, and the return spring 63. By pulling the unlocking slider 62, the drive block 60 retracts the locking pin 61, thereby releasing the seat 4 from the locking state in the support groove 10 and realizing position switching. The return spring 63 ensures that the locking pin 61 can automatically reset and re-insert into the front leg 1 after the unlocking slider 62 is released, restoring the locking function. The entire structure is easy to operate, responds quickly, and has self-locking capability, significantly improving the safety and convenience of the seat 4 adjustment process. Preferably, the unlocking slider 62 in this embodiment can also be equipped with a spring to achieve the automatic reset function after the user releases it.

[0058] More preferably, in this embodiment, a first locking hole 101 and a second locking hole 102 are provided at intervals on the inner wall of the bearing groove 10, and the locking pin 61 is movably inserted into the first locking hole 101 or the second locking hole 102, such as... Figure 4 As shown, the first locking hole 101 corresponds to the locking of the locking pin 61 when the seat plate 4 is in the first position, and the second locking hole 102 corresponds to the locking of the locking pin 61 when the seat plate 4 is in the second position. This design not only ensures that the seat plate 4 is firmly locked in both use states to prevent accidental sliding, but also provides clear position feedback to the user, enhancing the sense of security and structural stability.

[0059] The unlocking slider 62 is inclinedly provided with a traction hole 620, and the drive block 60 is formed with a traction block 600, which is movably engaged in the traction hole 620.

[0060] like Figure 2 As shown, in this embodiment, the traction block 600 is movably engaged within the inclined traction hole 620 to form an inclined transmission mechanism, allowing the user to pull the unlocking slider 62 along... Figure 2 When moving to the right, the traction hole 620 and the traction block 600 work together to convert the lateral tension force into the deformation force of the drive block 60 compressing the return spring 63, thereby driving the locking pin 61 to disengage from the first / second locking hole 102 to complete the unlocking function of the seat plate 42. This structure cleverly utilizes the mechanical transmission principle to make the unlocking operation more effortless and intuitive, thus improving the user experience.

[0061] The hind leg 2 is provided with an eccentric shaft 20, which is movably connected to the front leg 1. The rotation center of the eccentric shaft 20 is offset from the symmetrical center line of the hind leg 2 in its length direction and coincides with the symmetrical center line of the front leg 1 in its length direction.

[0062] like Figures 5 to 9 As shown, during the transition of the rear leg 2 from the unfolded position to the folded position, the rear leg 2 can achieve stable rotation around the eccentric shaft 20 (i.e., the axis of the eccentric shaft 20 is the rotation center of the rear leg 2 in this embodiment). The structure is simple and easy to assemble, improving the smoothness and reliability of the folding action. (Reference) Figure 5 and Figure 9 The structure shown can be implemented in this embodiment using the following two methods to achieve an isosceles support structure after rotation. Specifically, in this embodiment, the center line of symmetry of the front leg 1 is C, and the conventional rotation center of the hind leg 2 is [missing information]. Therefore, during the manufacturing process, Figure 9 The tip of the hind leg 2 needs to be further extended (i.e., extended to the outside of the front leg 1) until the rotation center D of the hind leg 2 falls on the symmetrical center line C of the front leg 1. However, considering the overall aesthetics and to prevent the hind leg 2 structure extending to the outside of the front leg 1 from causing bumps or knocks during use, this embodiment changes the rotation center of the hind leg 2 from... Figure 9 The position of point D shown has been changed to Figure 5 or Figure 9 Point B (i.e., the axis of eccentric shaft 20) is located off the center line of symmetry of the hind leg 2 but coincides with the center line of symmetry of the front leg 1, thanks to the rotation center of eccentric shaft 20. This asymmetrical arrangement allows the overall length of the hind leg 2 to be slightly shorter (i.e.,...). Figure 9 As shown, the top of the rear leg 2 never extends to the outside of the front leg 1 during rotation (to improve aesthetics and prevent bumps), ensuring that the bottom of both legs are on the same horizontal plane after folding (and the distance from the bottom of both legs to the center of rotation is equal), thereby avoiding structural shaking or tipping when folded, and improving the product's aesthetics and stability.

[0063] A track plate 11 is installed inside the front leg 1, and an arc-shaped guide hole 110 is formed inside the track plate 11. A guide block 21 is formed on the rear leg 2, and the guide block 21 is movably engaged in the arc-shaped guide hole 110.

[0064] like Figure 6 As shown, in this embodiment, the guide block 21 and the arc-shaped guide hole 110 precisely control the running trajectory of the rear leg 2. Therefore, during the rotation of the rear leg 2 relative to the front leg 1 around the axis of the eccentric shaft 20, the arc-shaped guide hole 110 provides precise trajectory constraints for the rotation of the rear leg 2, effectively preventing deviation or jamming during rotation, making the folding / unfolding action smoother and more stable, while also enhancing the overall rigidity and service life of the structure. It is precisely because of the constraint of the arc-shaped guide hole 110 that the range of rotation angle of the rear leg 2 relative to the front leg 1 is effectively limited, avoiding excessive rotation angle that could affect the normal use of the seat. It should be noted that in this embodiment, a connecting hole is also formed in both the track plate 11 and the front leg 1, and the eccentric shaft on the rear leg is movably connected in the connecting hole to realize the folding and unfolding operation of the rear leg relative to the front leg.

[0065] The unlocking mechanism 3 includes: an unlocking lever 30, which is movably disposed within the rear leg 2; a locking spring 31, wherein a protrusion 300 is formed at the end of the unlocking lever 30, one end of the locking spring 31 is connected to the protrusion 300, and the other end is connected to the inner wall of the rear leg 2; and an unlocking post 32, wherein a track groove 111 is provided in the track plate 11, one end of the unlocking post 32 is connected to the unlocking lever 30, and the other end is movably engaged in the track groove 111.

[0066] like Figures 6 to 8 As shown, when the rear leg 2 is in the use position, the unlocking lever 30 is movably engaged with one end of the track groove 111. At this time, the locking spring 31 is in the released state, effectively preventing the unlocking lever 30 and the unlocking pin 32 from sliding within the track groove 111, thereby achieving the locking function of the rear leg 2. When the user pulls the unlocking lever 30 along... Figure 7 As the rear leg 2 moves along its length, the locking spring 31 is gradually compressed. Simultaneously, the unlocking pin 32 slides partially out of the track groove 111, ensuring that the unlocking pin 32 can retract synchronously with the rear leg 2 around the axis of the eccentric shaft 20 towards the front leg 1. Figure 5 As shown in the diagram, the unlocking post 32 in this embodiment locks and releases by cooperating with the track groove 111. Users can unlock and fold with just one hand, making the whole process convenient and quick. At the same time, the locking spring 31 provides automatic reset and locking functions, which improves user experience and operating efficiency.

[0067] The track groove 111 includes a locking part 111a and a guide part 111b. When the unlocking post 32 is engaged in the locking part 111a, it can restrict the rear leg 2 to the unfolded position. The guide part 111b is set at an angle to the locking part 111a and is connected to each other to guide the rear leg 2 to rotate relative to the front leg 1 around the axis of the eccentric shaft 20 to the folded position.

[0068] like Figures 5 to 8 As shown, it is worth noting that in this embodiment, the opening 100 of the locking part 111a is aligned with the direction of movement of the unlocking lever 30 when it is unlocked, while the curvature of the guide part 111b is aligned with the curvature of the rear leg 2 when it rotates around the eccentric axis 20. Therefore, when the unlocking pin 32 is engaged in the locking part 111a, the rear leg 2 cannot rotate relative to the front leg 1. Only when the user pulls the unlocking lever 30 along the length of the rear leg 2, the unlocking pin 32 disengages from the locking part 111a and is positioned precisely at the opening 100 of the guide part 111b. As the user applies force to the rear leg 2 along the length of the front leg 1, the unlocking pin 32 can rotate. Figure 1 The rotational force in the direction of the arrow indicates that the unlocking post 32 can slide into the guide section 111b, and slide to the deepest part of the guide section 111b as the rear leg 2 rotates. At this time, the rear leg 2 is restricted. Figure 5 The folded position is shown. Therefore, the track groove 111 is designed to be connected at an angle to the locking part 111a through the guide part 111b, which forcibly constrains the unlocking path and the rear leg 2 to rotate around the eccentric axis 20 along a predetermined path. This prevents mis-locking and avoids shaking, misalignment or unexpected unfolding during folding, ensuring the repeatability and reliability of the folding action.

[0069] Preferably, in this embodiment, a semi-circular engaging groove (not shown in the figure) is also formed at the end of the guide portion 111b (the end of the guide portion 111b away from the locking portion 111a). As the unlocking pin 32 moves to the end of the guide portion 111b ( Figure 6 (As shown at the leftmost end of the guide part 111b), at this time the unlocking pin 32 is exactly aligned with the engaging groove. Under the elastic restoring force of the locking spring 31, the unlocking lever 30 can push the unlocking pin 32 into the engaging groove, thereby locking the rear leg 2 in the folded position, avoiding unnecessary trouble caused by mis-locking during transportation or storage, and ensuring the stability of the overall structure.

[0070] A guide hole 22 is also formed on the rear leg 2. One end of the guide hole 22 coincides with the locking part 111a, and the other end is located at the opening 100 of the guide part 111b. The unlocking pin 32 passes through the guide hole 22 and can slide back and forth inside it.

[0071] like Figure 4As shown, in this embodiment, the guide hole 22 partially overlaps with the guide portion 111b. This allows the unlocking pin 32 to smoothly disengage from the locking portion 111a along the length of the guide hole 22 during the unlocking process, effectively preventing jamming. Similarly, as the rear leg 2 switches from the folded position to the active position, the unlocking pin 32 reaches the junction of the guide portion 111b and the locking portion 111a before the rear leg 2 rotates. With the release of the user's tension on the unlocking block 30, the unlocking pin 32, under the elastic restoring force of the locking spring 31, accurately slides into the locking portion 111a, completing the locking function of the rear leg 2, thanks to the stable guidance and limiting function of the guide hole 22. Therefore, the guide hole 22 ensures the freedom of the unlocking pin 32 during the unlocking process while effectively limiting its movement trajectory, preventing structural failure or jamming due to excessive offset, thus improving the operational stability and durability of the entire unlocking mechanism 3.

[0072] Preferably, in this embodiment, both the unlocking lever 30 and the unlocking slider 62 have extended handles 301, and corresponding limiting grooves 23 are provided in the support 40 and the rear leg 2. The extended handles 301 are movably set in the limiting grooves 23, which not only makes it convenient for users to manually push and pull the unlocking slider 62 / unlocking lever 30 to trigger the unlocking action, but also the limiting grooves 23 constrain the movement range of the extended handles 301 to prevent damage to internal parts due to misoperation or excessive displacement, thus taking into account both human-machine interaction friendliness and structural protection.

[0073] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0075] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A child chair with a support function, characterized in that, include: The front leg and the rear leg, wherein the inner side of the front leg is provided with a support groove and the end of the support groove is formed with an opening facing the back of the chair; The hind leg is movably connected to the front leg and can switch between an extended position and a folded position of the front leg; An unlocking mechanism is provided inside the hind leg. The unlocking mechanism is used to restrict the hind leg to the unfolded position and guide the hind leg to rotate to the folded position, so that an angle is formed between the front leg and the hind leg, so that the distance from the rotation center of the hind leg to the bottom of the front leg and the hind leg is equal respectively. At least one seat, the seat being switchable between a first position and a second position of the front leg, the sidewall of the seat having a support block that is movably engaged in the support groove; An extension mechanism and a locking mechanism are provided on the seat plate. The extension mechanism includes an extension block that is engaged in the bearing groove and movably abuts against the bearing block. The locking mechanism is movably inserted into the front leg to restrict the seat plate to the first position or the second position. When the seat is in the first position, the support block and the extension block are completely housed in the support groove, and the support block and the extension block abut against each other; when the seat moves from the first position to the second position, the end of the support block extends out of the support groove along the opening direction, and the extension block moves in a direction away from the opening, so that the extension block and the support block are arranged at intervals in the support groove.

2. A child chair with a support function according to claim 1, characterized in that, The extension mechanism also includes: The limiting slider is provided, wherein the seat plate includes a support base connected to its bottom wall, the support block is connected to the support base and extends out of the seat plate, and the limiting slider is slidably disposed inside the support base; A connecting block is connected to the limiting slider. A limiting hole is formed on the outer wall of the bearing seat. The connecting block movably passes through the limiting hole and is connected to the extension block. An elastic element, one end of which is connected to the bearing seat and the other end of which is connected to the limiting slider.

3. A child chair with a support function according to claim 1, characterized in that, The hind leg is provided with an eccentric shaft, which is movably connected to the front leg. The rotation center of the eccentric shaft is offset from the center line of symmetry of the hind leg in its length direction and coincides with the center line of symmetry of the front leg in its length direction.

4. A child chair with a support function according to claim 1 or 2, characterized in that, An extension support plate is also formed at the end of the extension block away from the bearing block.

5. A child chair with a support function according to claim 2, characterized in that, The locking mechanism includes: A drive block and a locking pin are movably disposed within the bearing seat. The drive block is connected to the locking pin so as to drive the locking pin through the extension block along its axial direction and movably insert it into the front leg. The unlocking slider is movably disposed within the support base, and the driving block is movably engaged within the unlocking slider, so that when the unlocking slider slides along the radial direction of the locking pin, it pulls the driving block together with the locking pin to disengage from the front leg. A reset spring, one end of which is connected to the bearing seat and the other end of which is connected to the drive block.

6. A child chair with a support function according to claim 5, characterized in that, The unlocking slider is provided with a traction hole at an angle, and a traction block is formed on the driving block. The traction block is movably engaged in the traction hole.

7. A child chair with a support function according to claim 3, characterized in that, A track plate is installed inside the front leg, and an arc-shaped guide hole is formed inside the track plate. A guide block is formed on the rear leg, and the guide block is movably engaged in the arc-shaped guide hole.

8. A child chair with a support function according to claim 7, characterized in that, The unlocking mechanism includes: Unlock the lever; the active setting is located inside the rear leg. A locking spring is provided, wherein a protrusion is formed at the end of the unlocking lever, one end of the locking spring is connected to the protrusion, and the other end is connected to the inner wall of the rear leg. The unlocking post has a track groove inside the track plate. One end of the unlocking post is connected to the unlocking lever, and the other end is movably engaged in the track groove.

9. A child chair with a support function according to claim 8, characterized in that, The track groove includes a locking part and a guiding part. When the unlocking pin is engaged in the locking part, it can restrict the rear leg to the unfolded position. The guiding part and the locking part are arranged at an angle and are interconnected to guide the rear leg to rotate relative to the front leg around the axis of the eccentric shaft to the folded position.

10. A child chair with a support function according to claim 9, characterized in that, A guide hole is also formed on the hind leg. One end of the guide hole coincides with the locking part, and the other end is located at the opening of the guide part. The unlocking pin passes through the guide hole and can slide back and forth inside it.

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