Position adjustment mechanism for a seat lumbar support

Abstract

The utility model discloses a position adjusting mechanism of seat waist rest, its characterized in that, it includes waist rest main part, shell, inner slide block, spring, position locking assembly, waist rest main part is connected with inner slide block, and inner slide block is movably inserted in the shell, and the spring is connected between inner slide block and shell, position locking assembly is fixed on the shell, and is locked with inner slide block cooperation. The utility model discloses simple structure, good stability, and convenient operation adjusts.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and more specifically to a seat lumbar support position adjustment mechanism. Background Technology

[0002] Currently, many chairs on the market have a fixed connection between the backrest and seat. When the user leans back, the chair back, especially the lumbar support, detaches from the lower back, creating a gap. This causes the chair to lose support for the lower back, commonly known as "lumbar slippage." The spine does not receive effective support, and prolonged sitting can easily lead to various health problems. For example, Chinese Patent Publication No. CN217185374U discloses an adjustable lumbar support for a chair. Its features include a back panel and a backrest support seat movably mounted on the back panel, a backrest support frame mounted on the backrest support seat, and a headrest support. The backrest support frame includes upper and lower swing support plates, which are hinged to the backrest support seat. An upper slot is provided inside the backrest support seat, and the headrest support has a headrest support plate corresponding to the upper slot. The backrest support frame used in this patented structure includes upper and lower swing support plates, which can effectively support the human waist. However, the upper and lower swing support plates are directly hinged to the backrest support seat and are not adjustable. Since the waistline of people of different body sizes is different, the fit to the human waist is not very high. An adjustable lumbar support structure needs to be designed to improve the comfort of the seat. Its structure needs further improvement. Summary of the Invention

[0003] The purpose of this utility model is to provide a stable, reliable, and easy-to-operate lumbar support position adjustment mechanism to overcome the shortcomings of existing technologies.

[0004] The present invention achieves the above-mentioned objective by adopting the following technical solution: a seat lumbar support position adjustment mechanism, characterized in that it includes a lumbar support body, a shell, an inner slider, a spring, and a position locking assembly. The lumbar support body is connected to the inner slider, the inner slider is movably inserted into the shell, and the spring is connected between the inner slider and the shell. The position locking assembly is fixed on the shell and locks with the inner slider.

[0005] As a further explanation of the above solution, the main body of the lumbar support is provided with a connecting base, and the connecting base is provided with two or more lifting guide grooves and movable stop blocks. The rear part of the inner slider is provided with a pin that can be inserted into the lifting guide groove, and the movable stop block is provided with fasteners that are connected and fixed to the pin.

[0006] Furthermore, two or more lifting guide channels are arranged parallel to each other, and the movable stop block spans two or more lifting guide channels. Guide edges are provided on both sides of the lifting guide channels, and the movable stop block is provided with a slot corresponding to the guide edge, so that the movable stop block can slide along the guide edge, thereby adjusting the up and down position of the lumbar support body.

[0007] Furthermore, a rack is provided on the outer side of the lifting guide groove, and the rack is arranged parallel to the lifting guide groove. The rear part of the inner slider is connected to a corresponding swing block through a shaft. The swing block is connected to a return spring. The swing block is provided with a locking tooth that engages with the teeth of the rack. The locking tooth is designed as a trapezoidal tooth or sawtooth structure with a tooth pitch of 1-2mm and a tooth height of ≥2mm to ensure the stability of the engagement.

[0008] Furthermore, impact blocks are provided above and below the rack, and the impact blocks are in active contact with the swing block; the function of the impact blocks is to contact and impact the swing block to unlock it when the swing block is displaced into position.

[0009] Furthermore, at least two cooperating ribs and grooves are provided between the inner slider and the connecting base to serve as lifting and guiding elements.

[0010] Furthermore, the position locking assembly includes a knob base, a knob, a locking lever, and a spring. The outer casing has a locking hole and a slot. The knob base has a connecting block that passes through the slot and connects and fixes to the inner slider, which not only limits the movement distance of the inner slider but also prevents it from detaching from the outer casing. The spring is sleeved behind the locking lever and inserted into the knob base. The knob is sleeved outside the knob base and connected and fixed to the locking lever. An arc-shaped guide surface is provided inside the knob base, and a corresponding protrusion or plate is provided inside the knob that slides in cooperation with the arc-shaped guide surface, allowing the locking lever to insert into or disengage from the locking hole after the knob is rotated to a certain angle.

[0011] Furthermore, the top of the inner slider is provided with two or more guide grooves, the inner wall of the outer shell is provided with ribs corresponding to the guide grooves, the top of the outer shell is provided with two or more horizontal guide grooves and a connecting strip that crosses the horizontal guide grooves, and the connecting strip is provided with a protrusion that connects and fixes to the inner slider, thereby limiting the forward and backward movement of the outer shell.

[0012] The beneficial effects that this utility model can achieve by adopting the above-mentioned technical solution are:

[0013] This utility model adopts a lumbar support position adjustment structure mainly composed of a lumbar support body, a shell, an inner slider, a spring, and a position locking component. The lumbar support body is connected to the inner slider, which is movably inserted into the shell. The spring connects the inner slider and the shell. The position locking component is fixed to the shell and locks with the inner slider. When the position locking component is released, the lumbar support can move backward under force to adjust to a suitable position, so that the lumbar support can fully conform to the human waist, providing good and stable support for the user's waist and making it comfortable to use.

[0014] This utility model features a connecting base on the lumbar support body, with a lifting guide groove and a movable stop block on the connecting base. A rack is provided on the outside of the lifting guide groove, and the rack is arranged parallel to the lifting guide groove. The rear of the inner slider is connected to a corresponding swing block via a shaft. The swing block is connected to a return spring, and the swing block has teeth that engage with the teeth of the rack. When adjusting the up and down position of the lumbar support body, the swing block can play a locking and positioning role, making operation and adjustment convenient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the main structure of the lumbar support of this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the mounting structure of the inner slider and the outer shell of this utility model.

[0019] Figure 5 This is a schematic diagram of the installation structure for the position locking component.

[0020] Figure 6 This is a schematic diagram of the connection structure between the locking rod and the inner slider.

[0021] Figure 7 This is a schematic diagram of the internal slider structure.

[0022] Figure 8 This is a schematic diagram of the outer shell structure.

[0023] Figure 9 This is a schematic diagram of the installation structure for the position locking component.

[0024] Figure 10 This is a schematic diagram of the swing block installation structure.

[0025] Figure 11 This is a schematic diagram of the position locking component structure.

[0026] Figure 12This is a schematic diagram of the internal structure of the position locking component.

[0027] Figure 13 This is a schematic diagram of the installation structure of the locking rod and spring components.

[0028] Explanation of reference numerals in the attached drawings: 1. Lumbar support body; 2. Outer shell; 2-1. Slot; 2-2. Locking hole; 2-3. Raised rib; 2-4. Horizontal guide groove; 3. Inner slider; 3-1. Pin; 3-2. Guide groove; 3-3. Fixing hole; 4. Spring; 5. Position locking assembly; 5-1. Knob seat; 5-11. Arc-shaped guide surface; 5-2. Knob; 5-21. Protrusion or protruding plate; 5-3. Locking rod; 5-4. Spring component; 6. Connecting base; 6-1. Lifting guide groove; 6-2. Movable stop block; 6-3. Guide edge; 6-4. Rack; 6-5. Impact block; 7. Swinging block; 8. Raised rib; 9. Groove; 10. Connecting strip. Detailed Implementation

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in this description of the utility model, "at least" means one or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In utility models, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "below" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of this utility model clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0034] like Figures 1-13 As shown, this utility model is a seat lumbar support position adjustment mechanism, including a lumbar support body 1, a housing 2, an inner slider 3, a spring 4, and a position locking assembly 5. The lumbar support body 1 is connected to the inner slider 3, which is movably inserted into the housing 2. The spring 4 is connected between the inner slider 3 and the housing 2. In this embodiment, the spring 4 is a compression spring, installed between the inner slider 3 and the rear end of the housing 2 cavity, providing a resetting driving force for the lumbar support body; the position locking assembly 5 is fixed to the housing 2 and locked in cooperation with the inner slider 3. The lumbar support body 1 is provided with a connecting base 6, which is plate-shaped and vertically installed at the rear of the lumbar support body. The connecting base 6 has two lifting guide grooves 6-1 and corresponding movable stop blocks 6-2. The two lifting guide grooves are arranged parallel to each other, and the movable stop blocks span the two lifting guide grooves. Guide edges 6-3 are provided on both sides of the lifting guide grooves, and the movable stop blocks have grooves corresponding to the guide edges, allowing the movable stop blocks to slide along the guide edges, thereby adjusting the vertical position of the lumbar support body. The surfaces of the guide edges on both sides of the guide grooves are provided with anti-slip textures or ball bearing structures to reduce friction and improve sliding smoothness. The rear of the inner slider 3 has a pin 3-1 that can be inserted into the lifting guide groove 6-1, and the movable stop block 6-2 is provided with fasteners that connect and fix it to the pin 3-1.

[0035] A rack 6-4 is provided on the outer side of the lifting guide groove 6-1, and the rack is arranged parallel to the lifting guide groove. The rear of the inner slider 3 is connected to a corresponding swing block 7 via a shaft. A positioning post is provided at the rear of the swing block 7, and a return spring is sleeved on the positioning post. The swing block is provided with locking teeth that can engage with the teeth of the rack. Impact blocks 6-5 are provided above and below the rack 6-4. The function of the impact blocks 6-5 is to contact and impact the swing block 7 when the swing block 7 is in the correct vertical position to unlock it. The locking teeth are designed as trapezoidal teeth or sawtooth structures with a tooth pitch of 1-2mm and a tooth height ≥2mm to ensure engagement stability. Two cooperating ribs 8 and grooves 9 are provided between the inner slider 3 and the connecting base 6 to guide the lifting. When adjusting the vertical position of the waist rest body, the swing blocks can engage and position.

[0036] The inner slider 3 has two guide grooves 3-2 at its top, and the inner wall of the outer shell 2 has ribs 2-3 corresponding to the guide grooves 3-2, which provide linear guidance for the forward and backward movement of the outer shell. The top of the outer shell 2 has two or more horizontal guide grooves 2-4 and a connecting strip 10 spanning the horizontal guide grooves. The connecting strip 10 has protrusions that connect and fix to the inner slider 3, limiting the forward and backward movement of the outer shell 2. The position locking assembly 5 includes a knob seat 5-1, a knob 5-2, a locking rod 5-3, and a spring 5-4. The bottom of the outer shell 2 has a slot 2-1. The knob seat 5-1 has a connecting block that passes through the slot 2-1 and connects to the inner slider, which not only limits the movement distance of the inner slider but also prevents it from detaching from the outer shell. The bottom of the outer shell 2 has a locking hole 2-2, which is an elongated hole. Correspondingly, the inner slider 3 has a fixing hole 3-3 corresponding to the locking hole 2-2, allowing the locking rod to pass through the locking hole and enter the fixing hole. The spring is sleeved behind the locking rod and inserted into the knob seat. The knob is sleeved outside the knob seat and is connected and fixed to the locking rod. An arc-shaped guide surface 5-11 is provided inside the knob seat 5-1. A corresponding protrusion or plate 5-21 is provided inside the knob and slides in cooperation with the arc-shaped guide surface 5-11, so that after rotating the knob to a certain angle, the locking rod can be inserted into or disengaged from the lock hole.

[0037] During operation and adjustment:

[0038] 1. Height Adjustment: Loosen the knob and press the waist support body to make the swing block overcome the pressure of the reset spring and disengage from the rack. After moving to the target height, release it, and the block will automatically engage with the rack under the action of the spring.

[0039] 2. Front and back adjustment: Continuously rotate the knob until the locking rod is completely disengaged from the locking hole, press the lumbar support body, and the front and back position can be adjusted with the cooperation of the guide groove and the rib. Under the action of the spring, it fits the waist of the human body. After the adjustment is completed, rotate the knob in the opposite direction to lock the position.

[0040] Compared with existing technologies, this utility model features: 1. An integrated adjustment structure consisting of a lumbar support body, outer shell, inner slider, spring, and position locking assembly, enabling flexible adjustment of the lumbar support position. Compared with traditional fixed lumbar support structures, it can be adjusted according to user needs, greatly improving the usability of the chair. The spring acts as a buffer during adjustment, avoiding a stiff feeling during adjustment, and provides moderate elastic support when the user leans against it, enhancing comfort. The position locking assembly can securely lock after adjustment to the appropriate position, preventing position displacement due to accidental force during use and ensuring the stability of the support. 2. The connecting base of the lumbar support body is equipped with lifting guide grooves and movable stop blocks. The pins of the inner slider are inserted into the lifting guide grooves and fixed by the movable stop blocks. This connection method is simple and reliable. Two or more parallel lifting guide grooves ensure the straightness of the lumbar support body during vertical adjustment, preventing skewing. The movable stop blocks span multiple lifting guide grooves, and the cooperation between the guide edge and the groove further improves the stability and smoothness of vertical adjustment, making the adjustment process more stable and reducing jamming. The fasteners facilitate the disassembly and installation of the lumbar support body and the inner slider, making later maintenance and replacement easier. 3. The rack on the outside of the lifting guide groove cooperates with the swing block at the rear of the inner slider to achieve precise adjustment and positioning of the lumbar support body's vertical position. The locking teeth on the swing block engage with the teeth of the rack, ensuring the stability of the engagement and accurately fixing the lumbar support body in the required position, preventing slippage. The return spring ensures that the swing block remains engaged with the rack when no external force is applied, and when adjustment is needed, only a certain external force is required to disengage the locking teeth from the rack, making operation convenient. The impact blocks above and below the rack can unlock when the swing block reaches its limit position, preventing over-adjustment and extending the service life of the mechanism. 4. The ribs and grooves between the inner slider and the connecting base provide excellent lifting guidance. At least two cooperating ribs and grooves further limit the lateral displacement of the lumbar support body during vertical adjustment, ensuring the accuracy of the adjustment direction and making the adjustment more precise. Meanwhile, this structure increases the contact area between the inner slider and the connecting base, distributing the force, reducing local wear, and improving the overall strength and durability of the mechanism. 5. The knob seat, knob, locking rod, and spring components of the position locking assembly are ingeniously designed. The connecting block of the knob seat passes through the slot in the outer shell and connects to the inner slider, limiting the movement distance of the inner slider and preventing it from detaching from the outer shell, providing dual protection. The spring component is fitted onto the locking rod, providing power for the extension and retraction of the locking rod, allowing it to be tightly inserted into the lock hole or smoothly disengaged. The knob is connected and fixed to the locking rod, and the precise movement of the locking rod is achieved through the sliding cooperation between the protrusion or plate inside the knob and the arc-shaped guide surface inside the knob seat. Locking or unlocking is completed by rotating the knob to a certain angle; the operation is simple and convenient, and the locking effect is reliable, effectively ensuring the stability of the lumbar support position.6. The guide groove at the top of the inner slider cooperates with the raised rib on the inner wall of the outer casing, providing precise guidance for the back-and-forth movement of the inner slider within the casing, ensuring the straightness of the movement direction and preventing deviation. The horizontal guide groove at the top of the outer casing and the protrusion on the connecting strip are connected and fixed to the inner slider, effectively limiting the back-and-forth movement of the outer casing and preventing excessive movement of the inner slider that could damage the spring or cause other component failure. This structure, combining guidance and limiting, ensures the safety and reliability of the mechanism's operation while also improving the smoothness of adjustment.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A seat lumbar support position adjustment mechanism, characterized in that, It includes a lumbar support body, a housing, an inner slider, a spring, and a position locking assembly. The lumbar support body is connected to the inner slider, which is movably inserted into the housing. The spring connects the inner slider and the housing. The position locking assembly is fixed to the housing and locks with the inner slider.

2. The seat lumbar support position adjustment mechanism according to claim 1, characterized in that, The main body of the lumbar support is equipped with a connecting base, which has two or more lifting guide slots and a movable stop block. The inner slider is equipped with a pin that can be inserted into the lifting guide slot, and the movable stop block is equipped with fasteners that are connected and fixed to the pin.

3. The seat lumbar support position adjustment mechanism according to claim 2, characterized in that, At least two cooperating ribs and grooves are provided between the inner slider and the connecting base.

4. The seat lumbar support position adjustment mechanism according to claim 1, characterized in that, Two or more lifting guide channels are arranged in parallel to each other, and the movable stop block spans two or more lifting guide channels. Guide edges are provided on both sides of the lifting guide channels, and the movable stop block is provided with slots corresponding to the guide edges.

5. The seat lumbar support position adjustment mechanism according to claim 4, characterized in that, A rack is provided on the outside of the lifting guide groove. The rack is parallel to the lifting guide groove. The rear of the inner slider is connected to a corresponding swing block via a shaft. The swing block is connected to a return spring. The swing block is provided with locking teeth that can engage with the teeth of the rack.

6. The seat lumbar support position adjustment mechanism according to claim 5, characterized in that, Impact blocks are provided above and below the rack, and the impact blocks are in active contact with the swing block.

7. The seat lumbar support position adjustment mechanism according to claim 1, characterized in that, The position locking assembly includes a knob base, a knob, a locking lever, and a spring. The outer casing has a locking hole and a slot. The knob base has a connecting block that passes through the slot and is connected and fixed to the inner slider. The spring is sleeved on the locking lever and inserted into the knob base. The knob is sleeved on the outside of the knob base and is connected and fixed to the locking lever. The knob base has an arc-shaped guide surface, and the knob has a corresponding protrusion or plate that slides in cooperation with the arc-shaped guide surface.

8. The seat lumbar support position adjustment mechanism according to claim 1, characterized in that, The top of the inner slider is provided with two or more guide grooves, the inner wall of the outer shell is provided with ribs corresponding to the guide grooves, the top of the outer shell is provided with two or more horizontal guide grooves and a connecting strip that crosses the horizontal guide grooves, and the connecting strip is provided with protrusions to connect and fix with the inner slider.

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