A rake angle adjustable lever control seat chassis

Abstract

The utility model relates to a seat chassis technical field especially is a kind of adjustable pole control seat chassis of reclining angle, including bottom plate, it is characterized by: the bottom of bottom plate is equipped with movable seat, the movable seat center is equipped with conical tube fixed plate, connecting spinal canal is equipped below the conical tube fixed plate, movable seat inside one side is equipped with reclining adjustment mechanism, the reclining adjustment mechanism includes adjusting plate, locking pin is installed in the adjusting plate, angle adjusting torsional spring is equipped between locking pin and angle adjusting block, the utility model provides a kind of adjustable pole control seat chassis of reclining angle, by the movable connection of bottom plate and movable seat and inside reclining adjustment mechanism, user operation adjusting rod can be flexibly adjusted and firmly locked seat reclining angle, locking pin and angle adjusting block engagement realize multistage regulation, angle adjusting torsional spring is designed specially for reclining control, auxiliary locking pin smoothly switches gear and provides locking holding force, ensure that reclining angle is clear and stable.

Description

Technical Field

[0001] This utility model relates to the field of seat chassis technology, and in particular to a lever-controlled seat chassis with adjustable tilt angle. Background Technology

[0002] With the increasing demands for comfort and ergonomics in modern office environments and home life, chairs, as one of the most frequently used pieces of furniture in daily work and rest, are receiving more and more attention for their functionality and adjustability. Office chairs, in particular, typically need to have adjustable backrest angles to accommodate different user body types, sitting habits, and the comfort needs of prolonged use. This allows users to adjust the backrest tilt according to their needs while seated, achieving the purpose of relaxing the back and relieving fatigue. While traditional chair chassis may have some tilting functions, most use simple fixed or single-angle locking designs, resulting in inflexible adjustment methods, complex operation, and some even relying solely on friction pads for tension adjustment. This not only makes it difficult to accurately control the tilt angle but also suffers from problems such as insecure locking, easy slippage, laborious adjustment, and short lifespan. Existing chair chassis technology has significant shortcomings in terms of tilt adjustment flexibility, ease of operation, locking reliability, and structural durability, failing to meet users' dual needs for comfortable adjustment and safe use.

[0003] Chinese patent discloses a seat chassis (publication number: CN 219629147 U) including a housing, a movable support, a spring assembly, and an adjustment assembly. The middle part of the movable support is rotatably connected to the housing. The spring assembly is inclined and driven to the movable support. The spring assembly can extend and retract with the rotation of the movable support. The adjustment assembly includes a cam with multiple position slots on its edge. The spring assembly has a corresponding position column. However, this seat chassis has problems such as insufficient flexibility and precision in tilt angle adjustment, loose locking, laborious or unintuitive adjustment operation, poor structural stability, and short service life. It cannot well balance user comfort and long-term reliability. Therefore, a lever-controlled seat chassis with adjustable tilt angle is needed. Utility Model Content

[0004] The purpose of this invention is to solve the problems of existing seat chassis, such as insufficient flexibility and precision in tilt angle adjustment, loose locking, laborious or unintuitive adjustment operation, poor structural stability, and short service life, which make it difficult to balance user comfort and long-term reliability. Therefore, this invention proposes a lever-controlled seat chassis with adjustable tilt angle.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A tilt-adjustable lever-controlled seat chassis, comprising a base plate, characterized in that: a movable seat is provided at the bottom of the base plate; a conical tube fixing plate is provided at the center of the movable seat; a connecting conical tube is provided below the conical tube fixing plate; a tilt adjustment mechanism is provided on one side inside the movable seat; the tilt adjustment mechanism includes an adjustment plate; a locking pin is installed inside the adjustment plate; one end of the locking pin is connected to an adjustment rod and extends to the outer wall of the movable seat; an angle adjustment block is provided on one side of the top of the adjustment plate and engages with it; an angle adjustment torsion spring is provided between the locking pin and the angle adjustment block; and a protective cover is provided on the top of the angle adjustment torsion spring and the locking pin. This technical solution, by setting up a tilt adjustment mechanism, allows the user to control the engagement state of the locking pin and the angle adjustment block by operating the exposed adjustment rod, thereby achieving adjustment and locking of the seat tilt angle. The lever control design of the adjustment rod conforms to ergonomic operating habits, making operation intuitive and convenient. The angle-adjusting torsion spring, as a specially designed elastic element for assisting tilt control, acts on the locking pin or related components of the adjustment mechanism to provide appropriate rebound guiding force and angle holding force for tilt movement. This makes the tilt adjustment process smoother and more natural, ensuring that each tilt position is clearly identifiable and securely locked, preventing unexpected loosening or displacement during use, and enhancing safety. The protective cover protects the key internal adjustment components, enhancing the stability and durability of the structure. Overall, it achieves the function of flexible and reliable seat tilt angle adjustment and locking.

[0006] Preferably, the locking pin is composed of several cylindrical segments and several square locking segments arranged at intervals. The locking pin as a whole has an L-shaped structure, and the adjusting plate has an adjusting groove. The locking pin cooperates with the adjusting groove. The L-shaped structure design of the locking pin, which combines cylindrical segments and square locking segments at intervals, allows it to slide smoothly in the adjusting groove and achieve a stable angle lock at a specific position by engaging the square locking segments with the groove. This structural design cleverly combines sliding flexibility and locking reliability, allowing the seat to easily switch between multiple preset tilt angles and remain stable at the selected angle, avoiding unexpected tilting and loosening during use, and improving user safety and comfort.

[0007] Preferably, the movable seat has multiple compression springs on one side, with two springs arranged correspondingly. A fixing block is located on the top of each spring, and one end of the fixing block engages with the angle adjustment block. By providing a pair of corresponding compression springs and fixing blocks inside the movable seat, a certain auxiliary force can be provided to the angle adjustment block, making it more stable when engaged with the locking pin. This helps improve the positioning accuracy and operating feel during tilt angle switching. This design helps the angle adjustment block stay in the set position, enhances the structural coordination of the entire tilt adjustment mechanism, and makes the user adjust the tilt angle more smoothly and naturally, improving the functionality and comfort of the adjustment process.

[0008] Preferably, multiple screws are provided between the adjusting plate and the movable seat. The use of multiple screws to fix the adjusting plate and the movable seat ensures a firm connection and accurate relative position. This connection method not only enhances the overall structural stability of the tilt adjustment mechanism but also effectively avoids loosening or misalignment of components that may occur due to prolonged use or frequent adjustments, ensuring the long-term reliable operation of the tilt angle adjustment function and improving the product's durability and safety.

[0009] Preferably, a rivet is provided at the connection between the movable seat and the base plate, and a bushing is provided at the connection between the rivet and the movable seat. The movable seat and the base plate are connected by rivets, and a bushing is provided at the connection between the rivet and the movable seat. This design significantly reduces the frictional resistance of the movable seat during tilting and rotation, making the tilting action smoother and more fluid. The bushing also protects the rivets and connecting parts, reduces wear, extends the service life of the chassis, and improves the user's comfort and smoothness when adjusting the tilt angle.

[0010] Preferably, multiple circular contact points are provided at the connection between the base plate and the movable seat around their perimeter. These circular contact points help create uniform support and contact between the two, improving the overall structural stability and stress balance. This design not only reduces friction and interference between the movable seat and the base plate during tilting, but also enhances the structural reliability at their connection point, optimizes the user's experience when adjusting the tilt angle, and makes the entire chassis more stable, safe, and durable during dynamic use.

[0011] The advantages of this utility model are: This invention provides a lever-controlled seat chassis with adjustable tilt angle. Through a scientifically designed structure, it achieves flexible adjustment and secure locking of the seat back tilt angle, effectively improving user comfort and ease of operation. The chassis establishes a relatively movable structural foundation between the base plate and the movable seat, and a dedicated tilt adjustment mechanism is installed inside the movable seat. This mechanism drives a locking pin to move within an adjustment slot via an adjustment rod, allowing the square locking section of the locking pin to selectively engage with the angle adjustment block or the slot. This precisely controls and locks the seat tilt angle. Users can easily switch between different comfortable angles simply by operating the exposed adjustment rod; the operation is intuitive and responsive. Simultaneously, an angle adjustment torsion spring, as a dedicated elastic element for assisting tilt control, acts on the locking pin or related components of the adjustment mechanism, providing appropriate rebound guiding force and angle holding force for the tilt movement. This makes the tilt adjustment process smoother and more natural, ensuring that each tilt position is clearly identifiable and securely locked, preventing unexpected loosening or displacement during use, and enhancing safety. Furthermore, the chassis employs a structure combining L-shaped locking pins with cylindrical and square segments, enabling multi-level adjustment in conjunction with adjustment slots. It utilizes compression springs and fixed pressure blocks to assist in the positioning and stabilization of the angle adjustment block. Multiple screws securely connect the adjustment plate and the movable seat, enhancing the overall structural consistency of the adjustment mechanism. Rivets and bushings connect the movable seat and the base plate, resulting in smoother tilting and rotation and reduced wear. Circular contact point blocks are placed around the base plate and the movable seat to optimize support and force distribution between them. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0013] Figure 1 This is a schematic diagram of the exploded structure of this utility model.

[0014] Figure 2 This is a top view of the initial locking structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the right-side structure for controlling and locking the present invention.

[0016] Figure 4 This utility model Figure 3 A schematic diagram of the cross-sectional structure of AA.

[0017] Figure 5 This is a schematic diagram of the lifting right-side view structure of this utility model.

[0018] Figure 6 This utility model Figure 5 A schematic diagram of the cross-sectional structure of AA.

[0019] Figure 7 This is a schematic diagram of the unlocked, tilted-right structure of this utility model.

[0020] Figure 8 This is a schematic diagram of the unlocked, tilted-down structure of this utility model.

[0021] In the diagram: 1. Base plate; 2. Bushing; 3. Fixing block; 4. Compression spring; 5. Protective cover plate; 6. Cylindrical section; 7. Square locking section; 8. Adjusting rod; 9. Rivet; 10. Angle adjusting torsion spring; 11. Angle adjusting block; 12. Adjusting plate; 13. Movable seat; 14. Connecting conical tube; 15. Conical tube fixing plate; 16. Locking pin. Detailed Implementation

[0022] 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 scope of protection of the present utility model. Example

[0023] Please see Figure 1-8As shown, a tilt-adjustable lever-controlled seat chassis includes a base plate 1. The base plate 1 has a movable seat 13 at its bottom, a conical tube fixing plate 15 at its center, a connecting conical tube 14 below the conical tube fixing plate 15, a tilt adjustment mechanism on one side of the movable seat 13, the tilt adjustment mechanism including an adjustment plate 12, a locking pin 16 installed inside the adjustment plate 12, an adjustment rod 8 connected to one end of the locking pin 16 and extending to the outer wall of the movable seat 13, an angle adjustment block 11 on one side of the top of the adjustment plate 12 and engaging with it, an angle adjustment torsion spring 10 between the locking pin 16 and the angle adjustment block 11, and a protective cover plate 5 on the top of both the angle adjustment torsion spring 10 and the locking pin 16. This technical solution, by setting up a tilt adjustment mechanism, allows users to control the engagement state of the locking pin 16 and the angle adjustment block 11 by operating the exposed adjustment rod 8, thereby achieving adjustment and locking of the seat tilt angle. The lever control design of the adjustment rod 8 conforms to human operating habits, making operation intuitive and convenient. The angle adjustment torsion spring 10, as an elastic element specifically used to assist tilt control, acts on the locking pin 6 or related components of the adjustment mechanism, providing appropriate rebound guiding force and angle holding force for the tilt action, making the tilt adjustment process smoother and more natural, ensuring that each tilt position is clearly distinguishable and securely locked, avoiding unexpected loosening or displacement during use, and enhancing safety. The protective cover 5 protects the internal key adjustment components, enhancing the stability and durability of the structure. Overall, it achieves the function of flexible and reliable locking of the seat tilt angle.

[0024] In this embodiment, the locking pin 16 is composed of several cylindrical segments 6 and several square locking segments 7 arranged at intervals. The locking pin 16 has an overall L-shaped structure. The adjusting plate 12 is provided with an adjusting groove, and the locking pin 16 cooperates with the adjusting groove. The locking pin 16 adopts an L-shaped structure design with alternating cylindrical segments 6 and square locking segments 7, which allows it to slide smoothly in the adjusting groove and achieve a stable angle lock at a specific position by engaging the square locking segments 7 with the groove. This structural design cleverly combines sliding flexibility and locking reliability, allowing the seat to easily switch between multiple preset tilt angles and remain stable at the selected angle, avoiding unexpected tilting and loosening during use, and improving the safety and comfort of the user.

[0025] In this embodiment, a plurality of compression springs 4 are provided on one side inside the movable seat. There are two springs 4 arranged correspondingly, and a fixing block 3 is provided on the top of each spring 4. One end of the fixing block 3 cooperates with the angle adjustment block 11. By providing a pair of correspondingly arranged compression springs 4 and fixing blocks 3 inside the movable seat 13, a certain auxiliary force can be provided to the angle adjustment block 11, making it more stable when engaged with the locking pin 16. This helps improve the positioning accuracy and operating feel during the tilt angle switching process. This design helps the angle adjustment block 11 to remain in the set position, enhances the structural coordination of the entire tilt adjustment mechanism, makes the user adjust the tilt angle more smoothly and naturally, and improves the functionality and comfort of the adjustment process.

[0026] In this embodiment, multiple screws are provided between the adjusting plate 12 and the movable seat 13. The adjusting plate 12 and the movable seat 13 are fixed together using multiple screws, ensuring a firm connection and accurate relative position. This connection method not only enhances the overall structural stability of the tilt adjustment mechanism but also effectively avoids loosening or misalignment of components that may occur due to prolonged use or frequent adjustments, ensuring the long-term reliable operation of the tilt angle adjustment function and improving the product's durability and safety.

[0027] In this embodiment, a rivet 9 is provided at the connection between the movable seat 13 and the base plate 1, and a bushing 2 is provided at the connection between the rivet 9 and the movable seat 13. The movable seat 13 and the base plate 1 are connected by the rivet 9, and the bushing 2 is provided at the connection between the rivet 9 and the movable seat 13. This design can significantly reduce the frictional resistance of the movable seat 13 during tilting and rotation, making the tilting action smoother and more fluid. The use of the bushing 2 also protects the rivet 9 and the connection part, reduces wear, extends the service life of the chassis, and improves the user's operating comfort and smoothness when adjusting the tilt angle.

[0028] In this embodiment, multiple circular contact points are provided at the connection points of the base plate 1 and the movable seat 13 around their perimeter. These circular contact points help to create uniform support and contact between the two, improving the overall structural stability and stress balance. This design not only reduces friction and interference between the movable seat 13 and the base plate 1 during tilting, but also enhances the structural reliability of the connection point, optimizes the user's experience when adjusting the tilt angle, and makes the entire chassis more stable, safe, and durable during dynamic use.

[0029] The implementation principle of this embodiment is as follows: The base plate 1 serves as a fixed foundation and is connected to the underside of the seat. The movable seat 13 can tilt and rotate relative to the base plate 1, thereby causing the seat back to tilt. The movable seat 13 is equipped with a tilt adjustment mechanism, which is the core of the angle adjustment and locking mechanism. It includes components such as: adjustment plate 12, locking pin 16, adjustment rod 8, angle adjustment block 11, angle adjustment torsion spring 10, and protective cover plate 5. The adjustment plate 12 is provided with an adjustment slot, and the adjustment rod 8 is exposed on the outer wall of the movable seat 13 for user operation. The angle adjustment torsion spring 10 provides elastic guidance and angle holding force for the tilting action, making the tilting process smoother, and assisting in maintaining a stable state when locked.

[0030] When a user wishes to adjust the reclining angle of the seat back, they manually operate the adjustment lever 8 (push forward, pull back) to move the locking pin 16 within the adjustment plate 12, causing the square locking section 7 of the locking pin 16 to disengage from the adjustment slot. During this process, the angle adjustment torsion spring 10 undergoes a certain degree of deformation or torque, which assists the locking pin 16 in disengaging from its position and provides a certain rebound tendency for subsequent reclining movements, allowing the user to recline or adjust the backrest angle more naturally. Once the locking pin 16 is disengaged, the movable seat 13 and the base plate 1 are in a state of relative rotation. The user can then recline the seat back by leaning back to achieve the desired comfortable angle.

[0031] When the user stops tilting and wants to lock the current tilt angle, the locking pin 16 can be moved back to the corresponding adjustment slot position by reversing the adjustment lever 8 (or by releasing the adjustment lever 8 to reset it under the action of the torsion spring). The square locking section 7 of the locking pin 16 engages with the slot. At this time, the angle adjustment torsion spring 10 restores its deformation and provides a moderate rebound force to help the locking pin 16 stabilize in the position, ensuring that the tilt angle is firmly locked and preventing unexpected tilting loosening due to body shaking or external force during use.

[0032] The compression spring 4 and the fixed pressure block 3 assist the angle adjustment block 11 to maintain stability and improve the accuracy of gear switching; the adjustment plate 12 and the movable seat 13 are fastened by multiple screws to ensure that the overall adjustment mechanism structure is consistent and not easy to loosen; the movable seat 13 and the base plate 1 are connected by rivets 9 and bushings 2 are set to reduce rotational friction and improve tilt smoothness; the base plate 1 and the movable seat 13 are provided with circular contact point blocks around the perimeter to optimize support and force distribution and enhance overall stability; the angle adjustment torsion spring 10 not only assists the gear switching of the locking pin 16 in the whole process, but also directly participates in guiding the tilt action and maintaining the locked state, which is a key functional component for achieving comfortable tilt control.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A tilt-adjustable lever-controlled seat chassis, comprising a base plate (1), characterized in that: The bottom of the base plate (1) is provided with a movable seat (13), the center of the movable seat (13) is provided with a cone tube fixing plate (15), and a connecting cone tube (14) is provided below the cone tube fixing plate (15). The movable seat (13) is provided with a tilt adjustment mechanism on one side inside. The tilt adjustment mechanism includes an adjustment plate (12). A locking pin (16) is installed inside the adjustment plate (12). One end of the locking pin (16) is connected to an adjustment rod (8) and extends to the outer wall of the movable seat (13). An angle adjustment block (11) is provided on one side of the top of the adjustment plate (12) and they are engaged with each other. An angle adjustment torsion spring (10) is provided between the locking pin (16) and the angle adjustment block (11). The top of the angle adjustment torsion spring (10) and the locking pin (16) are provided with a protective cover plate (5).

2. The tilt-adjustable lever-controlled seat chassis according to claim 1, characterized in that: The locking pin (16) is composed of several cylindrical segments (6) and several square locking segments (7) arranged at intervals. The locking pin (16) has an overall L-shaped structure. The adjusting plate (12) is provided with an adjusting slot. The locking pin (16) cooperates with the adjusting slot.

3. The tilt-adjustable lever-controlled seat chassis according to claim 1, characterized in that: The movable seat (13) has multiple compression springs (4) on one side inside. There are two compression springs (4) and they are set in a corresponding manner. A fixed pressure block (3) is provided on the top of the compression spring (4). One end of the fixed pressure block (3) is engaged with the angle adjustment block (11).

4. The tilt-adjustable lever-controlled seat chassis according to claim 1, characterized in that: Multiple screws are provided between the adjusting plate (12) and the movable seat.

5. The tilt-adjustable lever-controlled seat chassis according to claim 1, characterized in that: The movable seat (13) is provided with a rivet (9) at the connection between it and the base plate (1), and a bushing (2) is provided at the connection between the rivet (9) and the movable seat (13).

6. The tilt-adjustable lever-controlled seat chassis according to claim 1, characterized in that: The base plate (1) and the movable seat (13) are provided with multiple circular contact point blocks at the four edges of the connection.

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