A type of all-iron folding chair that prevents hand pinching

Abstract

This utility model discloses an anti-pinch all-iron folding chair, relating to the field of folding furniture technology. It includes a seat, a first support rod, and a second support rod. A U-shaped groove is formed inside the seat, within which a sliding fixing component and a resetting component are installed. The fixing component includes a U-shaped slider, a connecting block, a cover plate, and a handle. A positioning post is provided at the end of the U-shaped slider. A rear cover plate is installed on the second support rod, and the rear cover plate has a positioning groove. The positioning post is automatically locked into the positioning groove by the spring force of the resetting component. When folding, the handle must be pulled forward to disengage the positioning post from the positioning groove. This design forces the user to operate correctly with both hands: one hand operates the handle at the front of the seat, and the other hand holds the back panel, effectively avoiding the hand-pinch area on the side of the seat and eliminating the risk of hand pinching due to improper operation. This also improves the safety and stability of the folding chair.

Description

Technical Field

[0001] This utility model relates to the field of folding furniture technology, specifically to an all-iron folding chair that prevents hand pinching. Background Technology

[0002] Folding chairs, as a type of seating that can be folded up or down via a hinge mechanism, are widely used in homes, conference rooms, and various temporary venues due to their ease of storage and transportation. Their core structure typically includes a seat frame, front and rear support legs, and movable pivots connecting these components.

[0003] However, while folding chairs offer convenience, they also carry inherent safety risks, the most prominent being hand-pinching accidents during unfolding or folding. Several existing designs aim to address this issue. For example, Chinese utility model patent CN212165375U proposes an anti-pinch chair that adds an arc-shaped connecting piece between the first and second supports, with its concave side facing upwards. While this provides some protection under ideal operating conditions, its effectiveness is highly dependent on the user's posture. In actual use, due to the lack of mandatory guidelines for operating procedures, users are highly susceptible to improper posture (such as single-handed operation, non-upright operation, or placing fingers in unintended areas), causing their fingers to bypass the arc-shaped protective piece and directly enter the mechanical gap between the support rod and the connecting shaft. More importantly, this design only attempts to eliminate the "pinch" result, failing to address the root cause of the improper operating behavior that leads to hand pinching. Therefore, existing passive protection technologies are insufficient to effectively prevent the risk of fingers being pinched due to poor operating habits or lack of understanding (such as children's curious exploration), and cannot effectively eliminate safety hazards caused by human error. Therefore, a full-iron folding chair with anti-pinch function is proposed. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an all-iron folding chair that prevents hand pinching. It has the advantages of forcibly regulating operating posture through a locking structure and eliminating the risk of hand pinching from the source. It solves the problem that existing folding chairs rely on passive protection and cannot correct improper operating habits of users, resulting in frequent hand pinching accidents.

[0005] (II) Technical Solution To achieve the aforementioned goal of forcibly regulating operating posture through a locking structure and eliminating the risk of pinching fingers from the source, this utility model provides the following technical solution: A folding chair with anti-pinch function made of iron includes a seat board with a U-shaped groove inside the seat board. The opening of the U-shaped groove faces the rear side of the seat board. Two symmetrical through holes are opened at the rear end of the seat board and communicate with the U-shaped groove. A through hole is opened at the front end of the bottom of the seat board and communicates with the U-shaped groove. A fixing component is slidably arranged in the U-shaped groove in the front-back direction, and at least two sets of reset components are provided inside the groove. The fixing assembly includes a U-shaped slider, a connecting block, a cover plate, and a handle; The seat plate is also hinged to a first support rod and a second support rod on both sides. A rear cover plate is fixedly installed on the second support rod. A positioning groove is opened on the rear cover plate. A positioning post is provided at the end of the U-shaped slider. The positioning post cooperates with the positioning groove through a through hole.

[0006] The seat has a pivot 1 and a pivot 2 symmetrically arranged on both sides. The first support rod is a U-shaped rod structure, and the second support rod is composed of two straight rod structures. The pivot 1 is located in front of the pivot 2. The pivot 1 cooperates with the first support rod, and the pivot 2 cooperates with the second support rod.

[0007] The first support rod has a back plate at its upper end, and each straight rod structure of the second support rod has a spherical limiter at its upper end. The spherical limiter has an adapter groove that contacts and engages with the first support rod.

[0008] One side of the U-shaped slider is attached to the inner wall of the U-shaped groove, the connecting block slides on the second through hole, the connecting block is fixedly installed at the bottom front end of the U-shaped slider, a cover plate is fixed at the bottom of the connecting block, the cover plate covers the bottom of the second through hole, and the handle is fixedly connected to the cover plate.

[0009] Each set of reset components includes two fixing plates and a spring. One fixing plate is installed on the side of the U-shaped slider, and the other fixing plate is installed on the outer wall of the U-shaped groove. The spring is located between the two fixing plates.

[0010] Both of the fixing plates have circular protrusions on their opposite surfaces that engage with the ends of the springs.

[0011] The first support rod and the second support rod are hinged together by two symmetrically arranged connecting rods, and both the first support rod and the second support rod are connected to a round rod at their bottom.

[0012] (III) Beneficial Effects Compared with the prior art, this utility model provides an all-iron folding chair that prevents hand pinching, which has the following beneficial effects: This all-iron folding chair with anti-pinch design utilizes a locking mechanism consisting of a U-shaped slider and a reset assembly inside the seat, along with a positioning groove on the second support rod, to achieve forced unlocking. When folding, the user must first pull the handle at the bottom of the seat forward, causing the U-shaped slider to slide forward against spring resistance, disengaging the positioning pin from the positioning groove before folding can proceed. This design fundamentally changes the traditional operation of folding chairs, actively intervening to force the user into the correct posture, ensuring that hands remain in a safe area throughout operation, completely eliminating the risk of pinching due to single-handed operation or fingers accidentally entering the mechanical gaps; it also prevents accidental pinching caused by the chair failing to lock. Attached Figure Description

[0013] Figure 1 A diagram illustrating an incorrect way of folding a traditional folding chair; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the bottom structure of this utility model; Figure 4 This is a partial sectional view of the internal structure of the seat plate in this utility model; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of the fixing component in this utility model.

[0014] In the diagram: 1. Seat plate; 2. First support rod; 3. Second support rod; 4. Fixing assembly; 5. Reset assembly; 6. Round rod; 7. Connecting rod; 101. U-shaped groove; 102. Through hole one; 103. Rotating shaft one; 104. Rotating shaft two; 105. Through hole two; 201. Back plate; 301. Spherical limiter; 302. Adaptor groove; 303. Rear cover plate; 304. Positioning groove; 401. U-shaped slider; 402. Connecting block; 403. Cover plate; 404. Handle; 405. Positioning post; 501. Fixing plate; 502. Protrusion; 503. Spring. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0016] Please see Figure 1 This is an extremely easy way to get your hand caught and is a frequently used incorrect folding method. Because traditional folding chairs do not have a folding locking device, one hand is used to hold the seat 1 and the other hand to hold the back panel 201 when folding. However, when the hand holding the seat 1 is located on the side of the seat 1, there is a serious area where your hand may be caught (i.e., Figure 1(Part B of the device) Only when the hand holding the seat 1 is at the front end of the seat 1 will it not be pinched. This device guides the hand to the front end of the seat 1 before folding by fixing component 4, which is safer and can correct the user's wrong folding method, and is very practical.

[0017] Please see Figure 2-6 A folding chair with anti-pinch function made of iron includes a seat 1. The seat 1 has a U-shaped groove 101 inside, with the opening of the U-shaped groove 101 facing the rear side of the seat 1. The rear end of the seat 1 has two symmetrically arranged through holes 102 that communicate with the U-shaped groove 101. The front bottom of the seat 1 has a through hole 105 that communicates with the U-shaped groove 101. A fixing component 4 is slidably arranged in the U-shaped groove 101 in a front-back direction, and at least two sets of reset components 5 are provided inside. The fixing component 4 includes a U-shaped slider 401, a connecting block 402, a cover plate 403, and a handle 404. A first support rod 2 and a second support rod 3 are hinged to both sides of the seat 1. A rear cover plate 303 is fixedly installed on the second support rod 3. The rear cover plate 303 has a positioning groove 304. The end of the U-shaped slider 401 is provided with a positioning post 405, which cooperates with the positioning groove 304 through the through hole 102.

[0018] In this embodiment, a first pivot 103 and a second pivot 104 are symmetrically arranged on both sides of the seat 1. The first support rod 2 is a U-shaped rod structure, and the second support rod 3 is composed of two straight rod structures. The first pivot 103 is located in front of the second pivot 104. The first pivot 103 cooperates with the first support rod 2, and the second pivot 104 cooperates with the second support rod 3.

[0019] It should be noted that the first pivot 103 and the second pivot 104 are spatially staggered, providing independent rotation axes for the first support rod 2 and the second support rod 3. This design ensures the stability of the seat plate 1. The first support rod 2 adopts a U-shaped rod structure, which enables it to form a stable two-point support with the seat plate 1; while the second support rod 3 adopts two independent straight rods, which facilitates the installation of locking structures such as the rear cover plate 303 at its upper end.

[0020] In this embodiment, a back plate 201 is provided at the upper end of the first support rod 2, and a spherical limiter 301 is provided at the upper end of each straight rod structure of the second support rod 3. An adapter groove 302 is provided on the spherical limiter 301, and the adapter groove 302 contacts and cooperates with the first support rod 2.

[0021] It should be noted that the spherical limiter 301 and its adapter groove 302 located at the upper end of the second support rod 3 have the core function of limiting the rotation of the first support rod 2 in the unfolded state. When the chair is fully unfolded, the first support rod 2 will engage in the adapter groove 302. This design effectively prevents abnormal noises or structural instability caused by lateral swaying during use, thus improving the overall rigidity of the product and the user experience.

[0022] In this embodiment, one side of the U-shaped slider 401 is attached to the inner wall of the U-shaped groove 101, the connecting block 402 slides on the through hole 105, the connecting block 402 is fixedly installed at the bottom front end of the U-shaped slider 401, a cover plate 403 is fixed at the bottom of the connecting block 402, the cover plate 403 covers the bottom of the through hole 105, and the handle 404 is fixedly connected to the cover plate 403.

[0023] It should be noted that the fitted design of the U-shaped slider 401 and the U-shaped groove 101 ensures that the U-shaped slider 401 will not deflect or jam during sliding, and the movement trajectory is precise. The connecting block 402 connects the bottom front end of the slider 401 to the cover plate 403 and the handle 404 as one unit. Its core function is the transmission of force: when the user pulls the handle 404, the force is directly driven by the connecting block 402 to drive the entire U-shaped slider 401 to slide forward against the force of the spring 503. The cover plate 403 prevents dust from entering the mechanism through the through hole 105 and prevents potential hand pinching problems.

[0024] In this embodiment, each set of reset components 5 includes two fixing plates 501 and a spring 503. One fixing plate 501 is installed on the side of the U-shaped slider 401, and the other fixing plate 501 is installed on the outer wall of the U-shaped groove 101. The spring 503 is located between the two fixing plates 501.

[0025] It should be noted that the working principle of the reset component 5 is as follows: In its natural state, the elastic force of the spring 503 pushes the U-shaped slider 401 through the two fixed plates 501, causing the positioning post 405 at its end to always maintain a backward movement trend. Thus, when the chair is unfolded, it automatically springs into the positioning groove 304 of the rear cover plate 303, achieving automatic locking. When folding is required, the user needs to apply force to overcome the elastic force of the spring 503 to pull the positioning post 405 out of the positioning groove 304. This "spring 503-driven locking, manual unlocking" mode ensures the reliability of the locking and the intuitiveness of the operation.

[0026] In this embodiment, circular protrusions 502 that are inserted into and cooperate with the ends of springs 503 are provided on the opposite surfaces of the two fixing plates 501.

[0027] It should be noted that circular protrusions 502 are provided on the opposite surfaces of the two fixing plates 501. Their main purpose is to accurately position and fix the two ends of the spring 503. The circular protrusions 502 are embedded in the coils at the ends of the spring 503, which can effectively prevent the spring 503 from sliding laterally or dislodging during compression or rebound, ensuring that the elastic force is always transmitted in a straight line, thereby improving the stability and service life of the reset assembly 5.

[0028] In this embodiment, two symmetrically arranged connecting rods 7 are hinged together on the first support rod 2 and the second support rod 3, and a round rod 6 is connected to the bottom of both the first support rod 2 and the second support rod 3.

[0029] It should be noted that the connecting rod 7 forms a classic triangular folding support structure. The connecting rod 7 functions similarly to the arc-shaped connecting piece in patent publication number CN212165375U, making folding smoother. The round rod 6 connected at the bottom enhances the stability of the chair in its unfolded state.

[0030] Working principle: When the folding chair is unfolded, the spring 503 of the reset assembly 5 pushes the positioning post 405 of the U-shaped slider 401 into the positioning groove 304 of the rear cover 303, forming a mechanical lock to prevent accidental folding. When folding is required, the user must use one hand to pull the handle 404 at the bottom of the seat 1 forward, driving the U-shaped slider 401 to slide forward against the resistance of the spring 503, causing the positioning post 405 to disengage from the positioning groove 304; the other hand holds the back panel 201 to stabilize the structure. This operation forces the user's hands to be positioned at the front end of the seat 1 and the back panel 201 respectively, avoiding the hand-pinching area on the side of the seat 1. After unlocking, the user can easily close the first support rod 2 and the second support rod 3 to complete the safe folding. The entire process actively guides the operating posture through the locking mechanism, fundamentally eliminating the risk of hand pinching.

[0031] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A full-iron folding chair with anti-pinch, comprising a seat plate (1), characterized in that: The seat plate (1) has a U-shaped groove (101) inside, the opening of the U-shaped groove (101) faces the rear side of the seat plate (1), the rear end of the seat plate (1) has two symmetrically arranged through holes (102) that communicate with the U-shaped groove (101), the front end of the bottom of the seat plate (1) has a through hole (105) that communicates with the U-shaped groove (101), a fixing component (4) is slidably arranged in the U-shaped groove (101) in the front-back direction, and at least two sets of reset components (5) are provided inside; The fixing component (4) includes a U-shaped slider (401), a connecting block (402), a cover plate (403), and a handle (404); The seat plate (1) is also hinged to a first support rod (2) and a second support rod (3) on both sides. A rear cover plate (303) is fixedly installed on the second support rod (3). A positioning groove (304) is provided on the rear cover plate (303). A positioning post (405) is provided at the end of the U-shaped slider (401). The positioning post (405) cooperates with the positioning groove (304) through a through hole (102).

2. The self-storing, self-stabilizing, full-iron folding chair of claim 1, wherein: The seat (1) is symmetrically provided with a first pivot (103) and a second pivot (104) on both sides. The first support rod (2) is a U-shaped rod structure, and the second support rod (3) is composed of two straight rod structures. The first pivot (103) is located in front of the second pivot (104). The first pivot (103) cooperates with the first support rod (2), and the second pivot (104) cooperates with the second support rod (3).

3. The self-folding chair of claim 2, wherein: The first support rod (2) is provided with a back plate (201) at its upper end. Each straight rod structure of the second support rod (3) is provided with a spherical limiter (301) at its upper end. The spherical limiter (301) is provided with an adapter groove (302) which is in contact with the first support rod (2).

4. The self-folding chair of claim 1, wherein: One side of the U-shaped slider (401) is in contact with the inner wall of the U-shaped groove (101). The connecting block (402) slides on the second through hole (105). The connecting block (402) is fixedly installed at the bottom front end of the U-shaped slider (401). A cover plate (403) is fixed at the bottom of the connecting block (402). The cover plate (403) covers the bottom of the second through hole (105). The handle (404) is fixedly connected to the cover plate (403).

5. The self-folding chair of claim 1, wherein: Each set of reset components (5) includes two fixing plates (501) and a spring (503). One fixing plate (501) is installed on the side of the U-shaped slider (401), and the other fixing plate (501) is installed on the outer wall of the U-shaped groove (101). The spring (503) is located between the two fixing plates (501).

6. The self-folding chair of claim 5, wherein: Both of the fixed plates (501) have circular protrusions (502) on their opposite surfaces that are inserted into the ends of the springs (503).

7. The self-folding chair of claim 1, wherein: The first support rod (2) and the second support rod (3) are hinged together by two symmetrically arranged connecting rods (7), and the bottom of the first support rod (2) and the second support rod (3) are both fixedly connected with round rods (6).

Images