Backrest folding mechanism and folding chair

Abstract

This utility model discloses a backrest folding mechanism, comprising: a folding body; at least two folding connectors, one end of which is connected to the left and right sides of the folding body respectively, and the other end of which is connected to a backrest support tube; at least two folding telescopic components, each including an outer connector and an inner connector; one end of the inner connector is connected to the lower side of the folding body, and the other end is always fitted inside the outer connector; the end of the outer connector away from the inner connector is connected to the backrest support tube; when the folding body is pressed to its maximum position, the connectors work together to open the backrest support tube to form an unfolded backrest; when the folding body is pulled up to its maximum position, the connectors work together to close the backrest support tube, and the inner connector partially extends out of the outer connector but remains fitted, forming a folded backrest. This utility model also discloses a folding chair using this mechanism.

Description

Technical Field

[0001] This utility model relates to the field of furniture manufacturing technology, specifically to a backrest folding mechanism and a folding chair. Background Technology

[0002] Folding chairs are widely used in homes, outdoors, and offices due to their ease of storage and transportation. However, existing folding chair backrest folding mechanisms generally suffer from the following technical problems:

[0003] 1. Unsmooth operation: During folding or unfolding, interference or jamming may easily occur between structural components, resulting in unsmooth operation, poor user experience, and even damage to the mechanism.

[0004] 2. Complex Structure / Poor Stability: To achieve the folding function, some mechanisms are designed to be overly complex, containing too many moving parts. This not only increases manufacturing costs and failure rates but may also lead to insufficient support or instability in the unfolded state. Other mechanisms, while simple in structure, cannot effectively absorb displacement changes during the folding process, resulting in uneven stress or deformation of components.

[0005] 3. Inconvenient operation: The folding operation mechanism (such as the unlock button or handle) is poorly designed or difficult to operate, does not conform to ergonomics, and is difficult to operate with one hand.

[0006] 4. Poor appearance / inconvenient storage: Many connection points are exposed, affecting the overall aesthetics. The volume can only be compressed slightly after folding, or some parts protrude, making it difficult to store.

[0007] 5. Poor adaptability: The backrest support point is fixed in position and cannot be adjusted in height according to different chair types or user needs.

[0008] Therefore, there is an urgent need to develop a new type of backrest folding mechanism to solve the above problems, achieve reliable, smooth, safe and convenient folding operation, and improve the product's aesthetics and versatility. Utility Model Content

[0009] To address the shortcomings of existing technologies, this utility model provides a backrest folding mechanism and a folding chair.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A backrest folding mechanism includes: a folding body; at least two folding connectors, one end of which is connected to the left and right sides of the folding body respectively, and the other end of which is connected to a backrest support tube; at least two folding telescopic components, each folding telescopic component including an outer connector and an inner connector; one end of the inner connector is connected to the lower side of the folding body, and the other end is always sleeved inside the outer connector; the end of the outer connector away from the inner connector is connected to the backrest support tube; when the folding body is pressed to its maximum position, each connector moves to open the backrest support tube to form an unfolded backrest; when the folding body is pulled to its maximum position, each connector moves to close the backrest support tube, and the inner connector partially extends out of the outer connector but remains sleeved, forming a folded backrest.

[0012] Furthermore, the bottom of the folding body is provided with a recessed cavity for the connector to be inserted; the top of the folding body is provided with a handle.

[0013] Furthermore, there are two folding connectors, symmetrically distributed on the left and right sides of the folding body; and there are two folding telescopic components, symmetrically distributed on the lower side of the folding body.

[0014] Furthermore, in the folding telescopic assembly, the outer connector is a cylindrical structure, the inner connector is a rod-shaped structure, and the inner connector and the outer connector are clearance-fitted to achieve axial telescopic movement.

[0015] Furthermore, the cross-section of the inner connector is square or circular; the cross-sectional shape of the outer connector matches that of the inner connector, and is a square or circular cylinder.

[0016] Furthermore, the folding connector is a cylindrical or solid structure with a square or circular cross-section.

[0017] Furthermore, the backrest support tube is provided with a detachable connector; the connector can move axially along the backrest support tube and is locked in the target position by fasteners; the folding connector and the external connector are connected to the connector.

[0018] A folding chair with a backrest folding mechanism includes a foldable folding chair body and a backrest connected to the folding chair body via the backrest folding mechanism.

[0019] The beneficial effects of this utility model are:

[0020] 1. The folding main body serves as the connection center for all moving parts, ensuring synchronized movement of the folding connectors on both sides and the folding telescopic assembly on the bottom, thus enabling the unfolding / folding action of the backrest support tube. The inner connector is always fitted inside the outer connector, preventing complete separation of parts during folding and reducing the risk of loss; in the folded state, the inner connector partially extends but remains fitted, providing a stable telescopic stroke to adapt to the space compression requirements when the backrest is closed; during the linkage process, displacement changes are absorbed through telescopic movement, reducing structural interference and ensuring smooth operation. The folding main body's press / pull mechanism drives the symmetrically distributed connectors and telescopic assembly, achieving stepless switching and self-locking between unfolded and folded states, preventing accidental operation.

[0021] 2. The nested telescopic components maintain partial interlocking when folded, eliminating the risk of parts falling off; the integrated connection points in the recessed cavity reduce protruding parts and improve storage safety.

[0022] 3. The top handle integrates operation functions, allowing for one-handed switching between states; the connecting body supports the backrest folding mechanism to be set at different height positions to meet individual needs. Attached Figure Description

[0023] Figure 1 The diagram shown is an exploded view of the backrest folding mechanism of this utility model.

[0024] Figure 2 The figure shown is a three-dimensional structural diagram of the backrest folding mechanism of this utility model;

[0025] Figure 3 The figure shown is a schematic diagram of the main structure of the backrest folding mechanism of this utility model.

[0026] Figure 4 The diagram shown is a front view of the backrest folding mechanism installed on the unfolded state of the folding chair.

[0027] Figure 5 The diagram shows a three-dimensional structural schematic of the backrest folding mechanism installed on a folding chair in its unfolded state.

[0028] In the diagram: 1. Folding main body; 2. Folding connector; 3. Folding telescopic assembly; 4. Support tube; 5. Connector; 6. Fastener; 7. Main body of the folding chair; 8. Backrest; 9. Connecting hole; 10. Clearance cavity; 31. External connector; 32. Internal connector. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] See Figure 1-5 As shown, this embodiment provides a backrest folding mechanism, including: a folding body 1; at least two folding connectors 2, one end of which is connected to the left and right sides of the folding body 1 respectively, and the other end of which is connected to the backrest support tube 4; at least two folding telescopic components 3, each folding telescopic component including an outer connector 31 and an inner connector 32; one end of the inner connector 32 is connected to the lower side of the folding body 1, and the other end is always sleeved inside the outer connector 31; the end of the outer connector 31 away from the inner connector 32 is connected to the backrest support tube 4; when the folding body 1 is pressed to the maximum position, each connector links to open the backrest support tube 4 to form an unfolded backrest state; when the folding body 1 is pulled to the maximum position, each connector links to close the backrest support tube 4, and the inner connector 32 partially extends out of the outer connector 31 but remains sleeved, forming a folded backrest state.

[0031] The folding body 1 serves as the connection center for all moving parts, ensuring synchronized movement of the folding connectors 2 on both sides and the folding telescopic assembly 3 on the lower side, thus realizing the unfolding / folding action of the backrest support tube 4. The inner connector 32 is always fitted inside the outer connector 31 to prevent complete separation of parts during folding and reduce the risk of loss; in the folded state, the inner connector 32 extends out but remains fitted, providing a stable telescopic stroke to adapt to the space compression requirements when the backrest is closed; during the linkage process, displacement changes are absorbed through telescopic movement to reduce structural interference and ensure smooth operation.

[0032] The bottom of the folding body 1 has a recessed cavity 10 for the connector to be inserted; the top of the folding body 1 has a handle 11. The recessed cavity 10 is designed to centrally house the rotating connection point, reducing exposed structure and improving overall aesthetics and safety. The handle 11 is integrated into the top of the folding body 1, which is ergonomic and allows the folding action to be triggered with one hand.

[0033] There are two folding connectors 2, symmetrically distributed on the left and right sides of the folding body 1; there are two folding telescopic components 3, symmetrically distributed on the lower side of the folding body 1. With one folding connector 2 on each side and one folding telescopic component 3 on each side below, the force transmission path is symmetrical and balanced, avoiding jamming or deformation caused by force on one side; the support tube 4 is subjected to uniform force, improving the load-bearing reliability in the unfolded state.

[0034] In the folding telescopic assembly 3, the outer connector 31 is a cylindrical structure, and the inner connector 32 is a rod-shaped structure. The inner connector 32 and the outer connector 31 are fitted together with a clearance to achieve axial telescopic movement. The clearance fit between the cylindrical outer connector 31 and the rod-shaped inner connector 32 achieves low-friction axial telescopic movement, ensuring smooth folding / unfolding action; the structure is simple and requires no additional slide rails, reducing the failure rate and manufacturing cost.

[0035] The inner connector 32 has a square or circular cross-section; the outer connector 31 matches the cross-sectional shape of the inner connector 32, and is a square or circular cylinder. The folding connector 2 is a cylindrical or solid structure with a square or circular cross-section. The matching design of the square / circular cross-section facilitates standardized production and assembly; the cylindrical or solid structure balances lightweight and strength requirements.

[0036] Each backrest support tube 4 is equipped with two detachably connected connectors 5; the connectors 5 can move axially along the backrest support tube 4 and are locked in the target position by fasteners 6; the folding connector 2 is connected to the upper connector 5, and the outer connector 31 is connected to the lower connector 5. The connectors 5 can move axially along the backrest support tube 4 and be locked to accommodate the backrest folding mechanism at different height positions.

[0037] A folding chair with a backrest folding mechanism includes a foldable main body 7 and a backrest 8 connected to the main body via the backrest folding mechanism. The backrest folding mechanism is connected to the main body as an independent module, facilitating maintenance and replacement; it is highly versatile and can be adapted to various chair designs.

[0038] It should be noted that the aforementioned folding connector 2 and folding body 1, inner connector 32 and folding body 1, folding connector 2 and connecting body 5, and outer connector 31 and connecting body 5 are all provided with connecting holes 9, and the connection between components is achieved by using pins, rivets or other connecting parts.

[0039] Backrest unfolded state: When the user presses down on the handle 11 at the top of the folding body 1 to its maximum position, the folding body 1 drives the connected left and right folding connectors 2 and the lower inner connector 32 to move synchronously. Under this linkage, the folding connectors 2 push the upper part of the backrest support tube 4 outward, while the inner connector 32 drives the outer connector 31 and the lower part of the backrest support tube 4 outward through the telescopic component. The linkage of all components ultimately opens the left and right backrest support tubes 4 to the unfolded state. At this time, most or all of the inner connector 32 of the folding telescopic component 3 retracts into the outer connector 31. The specific position depends on the design stroke. The mechanism is stably locked, providing reliable backrest support.

[0040] Backrest Folding State: When the user pulls the top handle 11 of the folding main body 1 to its maximum position, the folding main body 1 drives the connected left and right folding connectors 2 and the lower inner connector 32 to move in opposite directions simultaneously. Under this linkage, the folding connectors 2 pull the upper part of the backrest support tube 4 inward to close, while the inner connector 32 pulls the outer connector 31 and the lower part of the backrest support tube 4 inward through the telescopic component. All components work together to finally close the left and right backrest support tubes 4 to the folded state. During this process, the inner connector 32 will partially extend out of the outer connector 31, but will always remain fitted inside the outer connector 31 and will not completely detach. This design provides the necessary telescopic stroke, absorbs the displacement caused by the change in the angle of the support tube 4 when the backrest is closed, effectively reduces structural interference, and ensures smooth folding action; on the other hand, key components always maintain physical connection, completely avoiding the risk of parts being lost in the folded state. The overall volume of the mechanism is significantly compressed in the folded state, making it easy to store.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the patent scope of the present utility model. Therefore, all other embodiments described in the present utility model and the equivalent changes made thereto are included within the protection scope of the present utility model.

Claims

1. A backrest folding mechanism, characterized in that, include: Folding body (1); at least two folding connectors (2), one end of which is connected to the left and right sides of the folding body (1) respectively, and the other end is connected to the backrest support tube (4); at least two folding telescopic components (3), each folding telescopic component including an outer connector (31) and an inner connector (32); one end of the inner connector (32) is connected to the lower side of the folding body (1), and the other end is always sleeved inside the outer connector (31); the end of the outer connector (31) away from the inner connector (32) is connected to the backrest support tube (4); when the folding body (1) is pressed to the maximum position, each connector opens the backrest support tube (4) in conjunction to form the backrest unfolded state; when the folding body (1) is pulled to the maximum position, each connector closes the backrest support tube (4) in conjunction, and the inner connector (32) extends out of the outer connector (31) but remains sleeved, forming the backrest folded state.

2. The backrest folding mechanism according to claim 1, characterized in that, The bottom of the folding body (1) is provided with a recessed cavity (10) for the connector to be inserted; the top of the folding body (1) is provided with a handle (11).

3. The backrest folding mechanism according to claim 1, characterized in that, There are two folding connectors (2), which are symmetrically distributed on the left and right sides of the folding body (1); there are two folding telescopic components (3), which are symmetrically distributed on the lower side of the folding body (1).

4. The backrest folding mechanism according to claim 3, characterized in that, In the folding telescopic assembly (3), the outer connector (31) is a cylindrical structure, and the inner connector (32) is a rod-shaped structure. The inner connector (32) and the outer connector (31) are in clearance fit to achieve axial telescopic movement.

5. The backrest folding mechanism according to claim 4, characterized in that, The cross-section of the inner connector (32) is square or circular; the cross-sectional shape of the outer connector (31) matches that of the inner connector (32), and is a square tube or a circular tube.

6. The backrest folding mechanism according to claim 3, characterized in that, The folding connector (2) is a cylindrical or solid structure with a square or circular cross-section.

7. The backrest folding mechanism according to claim 1, characterized in that, The backrest support tube (4) is provided with a detachable connector (5); the connector (5) can move axially along the backrest support tube (4) and is locked in the target position by fasteners (6); the folding connector (2) and the outer connector (31) are connected to the connector (5).

8. A folding chair employing the backrest folding mechanism as described in any one of claims 1 to 7, characterized in that, It includes a foldable folding chair body (7) and a backrest (8) connected to the folding chair body (7) via a backrest folding mechanism.

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