Compact waist rest depth adjusting device and seat

Abstract

The invention discloses a compact waist rest depth adjusting device and a seat, the compact waist rest depth adjusting device comprises a waist rest unit and an adjusting assembly, the adjusting assembly comprises a cross hinge rod, a front mounting seat and a rear mounting seat, the front mounting seat is connected to the rear end of the waist rest unit, and the rear mounting seat is configured to be connected with a chair back unit; the cross hinge rod comprises a first hinge rod and a second hinge rod which are consistent in length, the middle of the first hinge rod and the middle of the second hinge rod intersect with each other and are hinged together through a rotating shaft, the front ends of the first hinge rod and the second hinge rod are both slidably connected to the front mounting base, and the rear ends of the first hinge rod and the second hinge rod are both slidably connected to the rear mounting base; a through groove is formed in the front mounting base in the front-back direction in a hollowed-out mode, a movable part is further hinged to the rotating shaft, and the front end of the movable part is slidably connected to the front mounting base through the through groove. According to the compact waist rest depth adjusting device and the seat, the gear adjusting operation of the waist rest has high stability and smoothness, and the adjusting assembly is very compact in overall structure and small in occupied space.

Description

Technical Field

[0001] This invention relates to the field of seating technology, specifically to a compact lumbar support depth adjustment device and a seat. Background Technology

[0002] Nowadays, people often sit for long periods at work or school, and the lack of support in the lower back can easily lead to fatigue, resulting in lumbar muscle strain, scoliosis, and other lumbar spine diseases. To maintain lumbar health, existing chairs usually have a lumbar support to support the user's lower back. With the support of a lumbar support, the lower back is less prone to fatigue and can help users correct posture, effectively protecting lumbar health. Furthermore, as user needs become more sophisticated, the requirements for lumbar supports are no longer limited to basic support functions. Different users have different gaps between their lower back and the chair back when sitting, meaning that a lumbar support that cannot be adjusted forward or backward will not be suitable for all types of users.

[0003] To address the aforementioned issues, existing patents provide a backrest device and a seat (Application No.: CN202421144171.7). The backrest device includes a back support, a lumbar support, and an adjustment assembly. The lumbar support is connected to the back support via the adjustment assembly. The adjustment assembly includes a first adjustment member, a second adjustment member, a locking member, and an elastic member. By utilizing the cooperation of the first adjustment member, the second adjustment member, the locking member, and the elastic member, the position of the lumbar support can be adjusted forward or backward. The back support is provided with a sliding column, and a receiving cavity is provided in the middle of the sliding column. The adjustment assembly is located in the receiving cavity, which helps to improve the compactness of the structure. A sliding sleeve is provided on the rear side of the lumbar support, which is fitted around the outer periphery of the sliding column and can slide back and forth.

[0004] However, the above solution has the following problems: the sliding column and sliding sleeve are interlocked and slide back and forth to adjust the depth of the lumbar support. The sliding column and sliding sleeve are relatively bulky in appearance and are easily exposed between the lumbar support and the backrest unit, which is awkward and not aesthetically pleasing. Without the sliding column and sliding sleeve, the movement of the adjustment component lacks guidance and is prone to deviation.

[0005] Therefore, how to provide a lumbar support depth adjustment device with a more compact structure and less prone to deviation during the adjustment process has become the main problem that needs to be solved. Summary of the Invention

[0006] In view of the aforementioned defects or deficiencies in the prior art, it is desirable to provide a compact lumbar support depth adjustment device and seat. By hinged a movable component to a pivot, when the cross hinge is extended forward or folded backward, the pivot moves back and forth along the axial direction of the cross hinge, thereby driving the movable component to move back and forth along the axis of the cross hinge. The design is ingenious, and the movable component is always located on the axis of the cross hinge without any offset, making the lumbar support adjustment operation highly stable and smooth. Moreover, when the lumbar support unit is at its rearmost position, the movable component can be inserted and integrated with the front mounting seat. After the cross hinge is folded backward, it is close to and nearly parallel to the front and rear mounting seats, making the overall structure of the adjustment component very compact and occupying less space. This allows the adjustment component to be hidden between the lumbar support unit and the backrest unit, making it less likely to be exposed, thus making the seat lighter and more aesthetically pleasing.

[0007] The effects of this invention are achieved as follows: In a first aspect, embodiments of this application provide a compact lumbar support depth adjustment device, including a lumbar support unit and an adjustment assembly. The adjustment assembly includes a cross hinge, a front mounting base, and a rear mounting base. The front mounting base is connected to the rear end of the lumbar support unit, and the rear mounting base is configured to connect to a chair back unit. The cross hinge includes a first hinge and a second hinge of the same length. The middle portions of the first hinge and the second hinge cross each other and are hinged together by a pivot. The front ends of both the first hinge and the second hinge are slidably connected to the front mounting base, and the rear ends of both the first hinge and the second hinge are slidably connected to the rear mounting base. A through groove is hollowed out along the front-rear direction on the front mounting base, and a movable part is also hinged to the pivot. The front end of the movable part is slidably connected to the front mounting base through the through groove. When the lumbar support unit is pulled forward or backward, the cross hinge rod unfolds forward or folds backward as a whole, the front mounting seat moves forward and backward relative to the rear mounting seat, and the pivot slides forward and backward relative to the front mounting seat along the axis of the cross hinge rod, thereby driving the movable part to slide forward and backward relative to the front mounting seat. A gear adjustment mechanism is provided between the movable part and the front mounting seat. The gear adjustment mechanism is configured to stop the movable part at the current sliding position, thereby allowing the lumbar support unit to be suspended at the current depth. When the lumbar support unit slides to its rearmost position, the moving part is inserted into the front mounting seat, and the cross hinge folds backward until the first hinge, the second hinge, the front mounting seat, and the rear mounting seat are in close contact with each other and approach parallelism.

[0008] Furthermore, the movable part is provided with a protrusion, and one side of the protrusion has a recessed area with multiple shift slots arranged in a front-to-back direction. The shift adjustment mechanism also includes a spring-loaded lever, one end of which is connected to the front mounting base, and the other end has a locking head that engages with the shift slot. The spring-loaded lever applies a spring force to the locking head, causing it to engage towards the shift slot. When the movable part slides back and forth along the through groove, the locking head engages with the multiple shift slots sequentially under the spring force of the spring-loaded lever. This makes the depth adjustment of the lumbar support tactilely adjustable, further improving the stability of the adjustment operation.

[0009] Furthermore, the top of the movable part is recessed with a mounting groove, and a protrusion is located within the mounting groove. An annular gap is formed between the protrusion and the groove wall. The gap between the side of the protrusion with the gear slot and the groove wall forms an adjustment channel, and the gap between the side of the protrusion with the gear slot and the groove wall forms a reset channel. When the movable part slides forward along the through groove, the lock head slides within the adjustment channel; when the movable part slides backward along the through groove, the lock head slides within the reset channel. This ensures that when the lumbar support unit is pulled forward, and the lock head switches between adjacent gear slots, the lock head slides out of the gear slot and moves within the adjustment channel, preventing deviation and making the gear adjustment process more stable. Simultaneously, when the lumbar support unit is adjusted to its foremost position, the lock head can be easily returned to its lowest position via the reset channel, making the gear reset operation more convenient.

[0010] Furthermore, the shift groove is tilted backward from the side closest to the adjustment groove to the side closest to the reset groove. This allows the locking head to stably engage at the bottom of the shift groove along the tilt direction when the lumbar support unit is supported by the user's waist, providing good stability. Additionally, as the lumbar support unit is pulled forward, the locking head slides out along the slope of the shift groove and smoothly engages in the next shift groove, making the lumbar support depth adjustment operation simpler and smoother.

[0011] Furthermore, the elastic lever is a flexible rod with its front end fixed to the front mounting base and its rear end bent downwards to form a lock head. The top of the front mounting base has a hollowed-out clearance hole that connects to a through slot, through which the lock head passes and inserts into the through slot. This improves the stability of the connection between the locking mechanisms and makes the lumbar support depth adjustment operation more stable.

[0012] Furthermore, the front end of the rear mounting base is recessed to form a connecting groove extending in a left-right direction. The rear ends of the first and second hinge rods are slidably connected to the rear mounting base through the connecting groove. The middle part of the rear mounting base protrudes to form a backrest connecting part, which divides the connecting groove into left and right parts. A first elastic element is provided between the side wall of the backrest connecting part and the first and second hinge rods. The first elastic element acts on the first and second hinge rods, causing them to always have an outward sliding tendency. This not only ensures that the lock head of the lumbar support unit can stably engage with the gear slot during use, preventing it from easily dislodging, thus improving stability, but also allows the lock head to automatically slide along the reset groove during the lumbar support unit reset process, making the reset operation simpler.

[0013] Furthermore, the first hinge rod has a first opening hollowed out in its middle, through which the second hinge rod passes. The second hinge rod also has a second opening hollowed out in its middle, through which the rear end of the movable part passes. The first hinge rod, the second hinge rod, and the movable part are stacked together in an alternating manner. This not only results in higher connection strength but also makes the adjustment assembly more compact in structure.

[0014] Furthermore, both the front and rear ends of the first and second hinge rods are bent towards the axis of the cross hinge rod to form curved sections. The first and second hinge rods are hinged together via these curved sections and the front and rear mounting seats. This allows the adjustment assembly to be folded more compactly, further reducing its footprint.

[0015] Furthermore, a first rotating part is provided at the front end of the front mounting base, and a second rotating part is provided at the rear end of the lumbar support unit. The first rotating part is hinged to the second rotating part, allowing the lumbar support unit to rotate up and down relative to the front mounting base. The lumbar support unit can rotate up and down relative to the front mounting base to adjust its tilt, thereby conforming to the waist of various users and improving its practicality.

[0016] Furthermore, a rotation limiting groove is hollowed out on the front mounting base opposite the second rotating part. The rear end of the second rotating part extends to form a limiting protrusion, which engages with the rotation limiting groove. A second elastic element is provided between the limiting protrusion and the bottom of the rotation limiting groove. Under the elastic force of the second elastic element, the limiting protrusion always has an upward rotation tendency. This gives the lumbar support unit the function of adaptively adjusting the tilt angle of the user's lumbar region, making it not only more convenient to use but also more comfortable.

[0017] Secondly, this application also provides a seat, including a backrest unit and a compact lumbar support depth adjustment device. The backrest unit includes a lumbar support mounting portion extending forward from the center, and a backrest connecting portion is provided in the center of the rear mounting seat. The backrest connecting portion is detachably connected to the lumbar support mounting portion, so that the compact lumbar support depth adjustment device is detachably connected to the backrest unit. This allows other lumbar supports with different functions and structures to be installed on the backrest unit, such as lumbar supports with massage functions, making it more practical.

[0018] Furthermore, the backrest connector and the lumbar support mounting part are detachably connected by screws. A recessed groove is formed on the rear side of the lumbar support mounting part, and the screw passes through the bottom of the groove and is screwed onto the backrest connector. A cover is also provided on the lumbar support mounting part, which is configured to conceal the groove. The connection mark between the lumbar support mounting part and the backrest connector is located within the groove and concealed by the cover, giving the seat a better overall appearance and aesthetic appeal.

[0019] The compact lumbar support depth adjustment device and seat provided in this application utilize a cross-hinged rod to achieve unfolding or folding through the relative rotation of two intersecting and hinged first and second hinge rods. This design is relatively simple and compact, and easy to manufacture. Furthermore, by unfolding or folding the cross-hinged rod as a whole, the first and second hinge rods slide relative to the front and rear mounting seats, allowing the front mounting seat to move back and forth in a parallel posture with the rear mounting seat. This ensures that the front mounting seat remains parallel during movement, thereby driving the lumbar support unit to move back and forth to adjust the depth, resulting in strong adjustment stability. Furthermore, the movable component is hinged to the pivot, so that when the cross hinge extends forward or folds backward, the pivot moves back and forth along the axial direction of the cross hinge, thereby causing the movable component to move back and forth along the axis of the cross hinge. That is, the movable component always slides perpendicular to the front mounting base, and the adjustment operation between it and the front mounting base is tactilely controlled via a gear adjustment mechanism. The ingenious design ensures that the movable component remains on the axis of the cross hinge without any offset, resulting in strong stability and smoothness in the lumbar support gear adjustment operation. Furthermore, the overall structure of the adjustment assembly is quite compact. The moving parts slide to the front mounting base via a through slot, allowing them to be recessed and integrated with the front mounting base as a single unit, resulting in a more compact overall structure. Especially when the lumbar support unit is at its rearmost position, the cross hinge folds backward and closely adheres to and nearly parallel the front and rear mounting bases, further enhancing the compactness and space-saving design of the adjustment assembly. This allows the adjustment assembly to be hidden between the lumbar support and backrest units, minimizing its visibility and contributing to a lighter and more aesthetically pleasing appearance for the seat. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural schematic diagram of the compact lumbar support depth adjustment device provided in the embodiments of this application; Figure 2 A schematic diagram illustrating the process of adjusting the depth of the lumbar support unit provided in this embodiment of the application; Figure 3 A schematic diagram of the connection structure between the lumbar support unit and the adjustment component provided in an embodiment of this application; Figure 4 This is a schematic diagram of the connection structure between the adjustment components provided in the embodiments of this application; Figure 5 A schematic diagram of the connection structure between the cross hinge and the rear mounting base provided in an embodiment of this application; Figure 6 A schematic diagram illustrating the state changes of the adjustment component when the lumbar support unit provided in this embodiment is located at the rearmost end; Figure 7 A schematic diagram illustrating the state change of the adjustment component when the lumbar support unit is adjusted forward, as provided in the embodiments of this application. Figure 8 A schematic diagram illustrating the state changes of the adjustment component when the lumbar support unit provided in this embodiment is located at the foremost position; Figure 9 A schematic diagram of the connection structure between the front mounting base and the lumbar support unit provided in an embodiment of this application; Figure 10 A cross-sectional structural diagram of the lumbar support unit and the front mounting base in the initial state provided in an embodiment of this application; Figure 11 A schematic cross-sectional view of the lumbar support unit and the front mounting base after the lumbar support unit is rotated according to an embodiment of this application. Figure 12 A three-dimensional structural diagram of the seat provided in the embodiments of this application; Figure 13 This is a schematic diagram of the connection structure between the chair back unit and the lumbar support unit provided in an embodiment of this application.

[0021] The reference numerals in the attached figures are as follows: 1-lumbar support unit, 110-second rotating part, 111-limiting protrusion, 120-second elastic element, 2-front mounting seat, 201-first sliding groove, 210-through groove, 220-clearance hole, 221-stop groove, 230-first rotating part, 240-rotation limiting groove, 3-rear mounting seat, 310-connecting groove, 311-second sliding groove, 320-backrest connecting part, 330-first elastic element 4a-First hinge rod, 4b-Second hinge rod, 401-First clearance opening, 402-Second clearance opening, 410-Rotating shaft, 420-Bending part, 5-Moving part, 510-Protrusion, 511-Gear slot, 520-Gear slot, 521-Adjustment channel, 522-Reset channel, 6-Elastic locking rod, 610-Lock head, 7-Backrest unit, 710-Lumbar support mounting part, 711-Receiving slot, 720-Cover. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0023] Please refer to the attached document. Figure 1-13 This application provides a compact lumbar support depth adjustment device, including a lumbar support unit 1 and an adjustment assembly. The adjustment assembly includes a cross hinge, a front mounting base 2, and a rear mounting base 3. The front mounting base 2 is connected to the rear end of the lumbar support unit 1, and the rear mounting base 3 is configured to connect to the backrest unit 7. The cross hinge includes a first hinge 4a and a second hinge 4b ​​of the same length. The middle parts of the first hinge 4a and the second hinge 4b ​​intersect each other and are hinged together by a pivot 410. The front ends of the first hinge 4a and the second hinge 4b ​​are slidably connected to the front mounting base 2, and the rear ends of the first hinge 4a and the second hinge 4b ​​are slidably connected to the rear mounting base 3. The front mounting base 2 has a through groove 210 hollowed out along the front-back direction. A movable part 5 is also hinged to the pivot 410. The front end of the movable part 5 is slidably connected to the front mounting base 2 through the through groove 210.

[0024] When the lumbar support unit 1 is pulled forward or backward, the cross hinge rod unfolds forward or folds backward as a whole, the front mounting seat 2 moves back and forth relative to the rear mounting seat 3, and the pivot 410 slides back and forth relative to the front mounting seat 2 along the axis of the cross hinge rod, thereby driving the movable part 5 to slide back and forth relative to the front mounting seat 2. A gear adjustment mechanism is provided between the movable part 5 and the front mounting seat 2. The gear adjustment mechanism is configured to stop the movable part 5 at the current sliding position, thereby making the lumbar support unit 1 hover at the current depth.

[0025] When the lumbar support unit 1 slides to the last end, the movable part 5 is inserted into the front mounting seat 2, that is, the movable part 5 is completely inserted into the front mounting seat 2 and does not protrude forward from the front mounting seat 2. The cross hinge folds backward until the first hinge 4a, the second hinge 4b, the front mounting seat 2 and the rear mounting seat 3 are close to each other and approach parallel.

[0026] In this embodiment, the cross-shaped hinge rod unfolds or folds through the relative rotation of two intersecting and hinged first hinge rods 4a and second hinge rods 5a. The structure is relatively simple and compact, and easy to manufacture. Furthermore, by unfolding or folding the cross-shaped hinge rod as a whole, the first hinge rods 4a and second hinge rods 5a slide relative to the front mounting base 2 and the rear mounting base 3. This allows the front mounting base 2 to maintain a parallel posture with the rear mounting base 3 during forward and backward movement, ensuring that the front mounting base 2 remains parallel throughout its movement. This, in turn, drives the lumbar support unit 1 to move forward and backward to adjust its depth, resulting in strong adjustment stability.

[0027] Furthermore, the movable part 5 is hinged to the pivot 410, so that when the cross hinge extends forward or folds backward, the pivot 410 moves back and forth along the axial direction of the cross hinge, thereby driving the movable part 5 to move back and forth along the axis of the cross hinge. That is, the movable part 5 always slides in a direction perpendicular to the front mounting seat 2, and the adjustment operation between the movable part 5 and the front mounting seat 2 is performed with a gear adjustment mechanism. The design is ingenious, and the movable part 5 is always located on the axis of the cross hinge without any offset, which makes the gear adjustment operation of the lumbar support highly stable and smooth. Suppose the movable part 5 is hinged to other positions of the cross hinge, as the first hinge 4a and the second hinge 4b ​​rotate, the points other than the pivot 410 move in an arc, that is, the movable part 5 will continuously offset in the front and back direction. As a result, no matter what gear adjustment method is used between the movable part 5 and the front mounting seat 2, the gear adjustment operation between the movable part 5 and the front mounting seat 2 will have a strong sense of sticking, and smooth and continuous adjustment cannot be achieved.

[0028] Furthermore, the overall structure of the adjustment assembly is quite compact. The movable part 5 is slidably connected to the front mounting base 2 via the through slot 210, allowing the movable part 5 to be submerged and integrated with the front mounting base 2 as a whole, thus making the overall structure of the adjustment assembly more compact. Especially when the lumbar support unit 1 is at the rearmost end, the cross hinge folds backward and closely adheres to and approaches parallel with the front mounting base 2 and the rear mounting base 3, making the overall structure of the adjustment assembly very compact and occupying less space. This allows the adjustment assembly to be hidden between the lumbar support unit 1 and the backrest unit 7, making it less likely to be exposed, thus making the seat lighter and more aesthetically pleasing.

[0029] Preferably, the left and right sides of the front mounting base 2 are both vertically perforated with first sliding grooves 201. The front ends of the first hinge rod 4a and the second hinge rod 5a are respectively hinged to the first sliding grooves 201 on the left and right sides by pins, and the front ends of the first hinge rod 4a and the second hinge rod 5a slide left and right relative to the front mounting base 2 through the first sliding grooves 201. The front end of the rear mounting base 3 is recessed to form a connecting groove 310 extending in the left and right direction. The groove walls on the left and right sides of the connecting groove 310 are both perforated with second sliding grooves 311. The rear ends of the first hinge rod 4a and the second hinge rod 5a are respectively hinged to the second sliding grooves 311 on the left and right sides by pins, and the rear ends of the first hinge rod 4a and the second hinge rod 5a slide left and right relative to the rear mounting base 3 through the second sliding grooves 311.

[0030] Please refer to the attached document. Figure 3-4 In some embodiments of this application, the movable member 5 is provided with a protrusion 510, and a plurality of gear slots 511 arranged in a front-back direction are recessed on one side of the protrusion 510. The gear adjustment mechanism also includes an elastic locking rod 6, one end of which is connected to the front mounting base 2, and the other end is provided with a locking head 610 that engages with the gear slots 511. The elastic locking rod 6 applies a spring force to the locking head 610 to engage in the direction of the gear slots 511. When the movable member 5 slides back and forth along the through groove 210, the locking head 610 engages with the plurality of gear slots 511 in sequence under the spring force of the elastic locking rod 6.

[0031] In this embodiment, when the user sits down, the locking head 610 on the elastic lever 6 engages with the positioning groove 511 on the protrusion 510, fixing the lumbar support unit 1 at the current depth and providing stable support for the user. When the lumbar support unit 1 needs adjustment, as the movable member 5 slides back and forth along the through groove 210, the elastic lever 6 moves relative to the movable member 5, and the locking head 610 abuts against the positioning groove 511, thereby forcing the elastic lever 6 to undergo elastic deformation until the locking head 610 slides into the previous or next positioning groove 511 along the opening direction of the positioning groove 511 to achieve the adjustment of the lumbar support unit 1. This provides a tactile feedback during the lumbar support depth adjustment operation, further improving the stability of the adjustment operation.

[0032] Preferably, the protrusion 510 is provided with three adjustable grooves 511, and the lumbar support unit 1 has at least three adjustable depth levels, providing a high degree of freedom. Of course, in other embodiments of this application, the number of adjustable grooves 511 can also be two, four, five, etc.

[0033] Please refer to the attached document. Figure 6-8In some embodiments of this application, the top of the movable member 5 is recessed and provided with a mounting groove 520, and a protrusion 510 is provided in the mounting groove 520. An annular gap is formed between the protrusion 510 and the groove wall of the mounting groove 520. The gap between the side of the protrusion 510 with the stop groove 511 and the groove wall of the mounting groove 520 forms an adjustment channel 521. The gap between the side of the protrusion 510 with the stop groove 511 and the groove wall of the mounting groove 520 forms a reset channel 522. When the movable member 5 slides forward along the through groove 210, the locking head 610 slides in the adjustment channel 521. When the movable member 5 slides backward along the through groove 210, the locking head 610 slides in the reset channel 522.

[0034] In this embodiment, by setting the gear slot 520, when the lumbar support unit 1 is pulled forward, the locking head 610 switches between adjacent gear slots 511. After the locking head 610 slides out of the gear slot 511, it moves within the adjustment channel 521, which is less likely to cause deviation and makes the gear adjustment process more stable. At the same time, when the lumbar support unit 1 is adjusted to the frontmost position, the locking head 610 can be easily returned to the lowest position through the reset channel 522, making the gear reset operation more convenient.

[0035] Please refer to the attached document. Figure 6-8 In some embodiments of this application, the gear slot 511 is tilted backward from the side near the adjustment channel 521 to the side near the reset channel 522.

[0036] In this embodiment, by tilting the shift groove 511, when the lumbar support unit 1 is supported by the user's waist, the locking head 610 can be stably locked at the bottom of the shift groove 511 along the tilt direction of the shift groove 511, making it less likely to come off and providing good stability. Furthermore, during the process of pulling the lumbar support unit 1 forward, the locking head 610 can slide out along the slope of the shift groove 511 and smoothly lock into the next shift groove 511, thereby making the lumbar support depth adjustment operation simpler and smoother.

[0037] Please refer to the attached document. Figure 4 In some embodiments of this application, the elastic locking rod 6 is an elastic rod. The front end of the elastic locking rod 6 is fixed to the front mounting base 2, and the rear end is bent downward to form a lock head 610. The top of the front mounting base 2 is hollowed out with a clearance hole 220. The clearance hole 220 is connected to the through groove 210. The lock head 610 passes through the clearance hole 220 and enters the through groove 210.

[0038] In this embodiment, the elastic locking rod 6 is a steel rod that has undergone bending processing, which is not only easy to process but also has high strength and good elastic deformation capability. Furthermore, the locking head 610 passes through the clearance hole 220 into the through groove 210 and connects with the movable part 5 in the through groove 210 to perform gear adjustment operation, thereby making the connection stability between the locking mechanisms better and the lumbar support depth adjustment operation more stable.

[0039] Preferably, the top of the front mounting base 2 is recessed downward to form a stop groove 221, which is connected to the clearance hole 220. The elastic locking rod 6 is engaged in the stop groove 221, and when the rear side of the elastic member 6 undergoes elastic deformation, it swings left and right in the stop groove 221, so that the connection strength between the elastic locking rod 6 and the front mounting base 2 is higher and the stability is better.

[0040] Please refer to the attached document. Figure 5 In some embodiments of this application, the front end of the rear mounting base 3 is recessed to form a connecting groove 310 extending in the left-right direction. The rear ends of the first hinge rod 4a and the second hinge rod 4b are slidably connected to the rear mounting base 3 through the connecting groove 310. The middle part of the rear mounting base 3 protrudes to form a backrest connecting portion 320. The backrest connecting portion 320 divides the connecting groove 310 into left and right parts. A first elastic member 330 is provided between the side wall of the backrest connecting portion 320 and the first hinge rod 4a and the second hinge rod 4b. The first elastic member 330 acts on the first hinge rod 4a and the second hinge rod 4b, so that the first hinge rod 4a and the second hinge rod 4b always have the tendency to slide outward.

[0041] In this embodiment, by setting the first elastic element 330, the first hinge 4a and the second hinge 4b ​​always have an outward sliding tendency, that is, the cross hinge has a tendency to fold backward, and the movable element 5 also has a tendency to slide forward relative to the front mounting base 2. This not only makes the locking head 610 stably engaged in the stop groove 511 during use, making it less likely to fall out, thus improving stability; it also allows the locking head 610 to automatically slide along the reset groove 522 during the reset process of the lumbar support unit 1, that is, the lumbar support unit 1 automatically moves backward, without requiring manual reset by the user, making the reset operation simpler.

[0042] Preferably, the first elastic element 330 is a spring, which not only has good elasticity but is also inexpensive and easy to install.

[0043] Please refer to the attached document. Figure 3In some embodiments of this application, the first hinge rod 4a has a first opening 401 hollowed out in the middle, the second hinge rod 4b passes through the first opening 401, the second hinge rod 4b has a second opening 402 hollowed out in the middle, and the rear end of the movable member 5 passes through the second opening 402. The first hinge rod 4a, the second hinge rod 4b, and the movable member 5 are stacked together in an alternating manner. This not only results in higher connection strength but also makes the adjustment assembly more compact in structure.

[0044] Please refer to the attached document. Figure 3-5 In some embodiments of this application, the front and rear ends of the first hinge rod 4a and the second hinge rod 4b are both bent toward the axis of the cross hinge rod to form a bent portion 420. The first hinge rod 4a and the second hinge rod 4b are both hinged to the front mounting seat 2 and the rear mounting seat 3 through the bent portions 420 on the front and rear sides.

[0045] In this embodiment, with the help of the bend 420, the corner space between the cross link and the front mounting base 2 and the rear mounting base 3 is larger, so that the first hinge 4a and the second hinge 4b ​​can rotate to fully fit the front mounting base 2 and the rear mounting base 3, thereby making the adjustment assembly fold more compactly and further reducing the space occupied.

[0046] Please refer to the attached document. Figure 3 and attached Figure 9 In some embodiments of this application, the front end of the front mounting base 2 is provided with a first rotating part 230, and the rear end of the lumbar support unit 1 is provided with a second rotating part 110. The first rotating part 230 is hinged to the second rotating part 110, so that the lumbar support unit 1 can rotate up and down relative to the front mounting base 2.

[0047] In this embodiment, the lumbar curvature of different users may vary, which means that if the tilt of the lumbar support unit 1 cannot be adjusted, it will not be suitable for different users. Therefore, by hinged to the front mounting base 2, the lumbar support unit 1 can rotate up and down relative to the front mounting base 2 to adjust its tilt, thereby conforming to the waist of various users and improving its practicality.

[0048] Please refer to the attached document. Figure 9-11 In some embodiments of this application, a rotation limiting groove 240 is hollowed out on the front mounting base 2 opposite to the second rotating part 110. The rear end of the second rotating part 110 extends to form a limiting protrusion 111. The limiting protrusion 111 is inserted into the rotation limiting groove 240. A second elastic member 120 is provided between the limiting protrusion 111 and the bottom of the rotation limiting groove 240. Under the elastic force of the second elastic member 120, the limiting protrusion 111 always has an upward rotation tendency.

[0049] In this embodiment, the limiting protrusion 111 on the first rotating part 110 rotates within the rotation limiting groove 240 of the front mounting seat 2, which not only increases the connection strength between the lumbar support unit 1 and the front mounting seat 2, but also allows the lumbar support unit 1 to automatically rotate to an angle that fits the user's waist when the user leans against it. The second elastic member 120 is compressed by the limiting protrusion 111, causing elastic deformation and applying a restoring force to the limiting protrusion 111. This allows the lumbar support unit 1 to provide a high degree of elastic support for the user's waist with the help of the elastic force of the second elastic member 120. When the user leaves the seat, the limiting protrusion 111 is pushed against the upper groove wall of the rotation limiting groove 240 by the restoring force of the second elastic member 120, and the lumbar support unit 1 returns to its initial state. Thus, the lumbar support unit 1 has the function of adaptively adjusting the tilt angle of the user's waist, making it not only more convenient to use but also more comfortable.

[0050] Preferably, the lumbar support unit 1 has two symmetrical second rotating parts 110 on its rear side, and the front mounting base 2 also has two first rotating parts 230 and two rotating limiting grooves 240 formed by hollowing out, thereby further improving the connection strength between the lumbar support unit 1 and the front mounting base 2 and making it more stable.

[0051] Preferably, the second elastic element 120 is a spring, which not only has good elasticity but is also inexpensive and easy to install.

[0052] Please refer to the attached document. Figure 12-13 This application embodiment also provides a seat, including a backrest unit 7 and a compact lumbar support depth adjustment device. The backrest unit 7 includes a lumbar support mounting portion 710 extending forward from the center. A backrest connecting portion 320 is provided in the center of the rear mounting seat 3. The backrest connecting portion 320 is detachably connected to the lumbar support mounting portion 710, so that the compact lumbar support depth adjustment device is detachably connected to the backrest unit 7.

[0053] In this embodiment, by detachably connecting the compact lumbar support depth adjustment device to the lumbar support mounting part 710, other lumbar supports with different functions and structures can also be installed on the backrest unit 7, such as lumbar supports with massage function, or lumbar supports with simple structure and strong elasticity, etc. Only a backrest connecting part 320 of the same specification needs to be set on the back of the lumbar support, which can be freely assembled with the backrest unit 7, making it more practical.

[0054] Please refer to the attached document. Figure 12-13In some embodiments of this application, the backrest connecting part 320 and the lumbar support mounting part 710 are detachably connected by screws. The rear side of the lumbar support mounting part 710 is recessed to form a receiving groove 711. The screw passes through the bottom of the receiving groove 711 and is screwed to the backrest connecting part 320. The lumbar support mounting part 710 is also covered with a cover 720, which is configured to cover the receiving groove 711.

[0055] In this embodiment, the lumbar support mounting part 710 and the backrest connecting part 320 are connected by screws, which makes the installation and disassembly of the backrest unit 7 and the lumbar support more convenient. Furthermore, the connection marks between the lumbar support mounting part 710 and the backrest connecting part 320 are located in the receiving groove 711 and are covered by the cover 720, so they are not exposed. This makes the seat have better overall integrity and aesthetics.

[0056] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention. 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise stated, "a plurality of" means three or more.

[0057] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A compact lumbar support depth adjustment device, characterized in that, The device includes a lumbar support unit (1) and an adjustment assembly. The adjustment assembly includes a cross hinge, a front mounting base (2), and a rear mounting base (3). The front mounting base (2) is connected to the rear end of the lumbar support unit (1), and the rear mounting base (3) is configured to connect to the backrest unit (7). The cross hinge includes a first hinge (4a) and a second hinge (4b) of the same length. The middle parts of the first hinge (4a) and the second hinge (4b) intersect each other and are hinged together by a pivot (410). The front ends of the first hinge (4a) and the second hinge (4b) are slidably connected to the front mounting base (2), and the rear ends of the first hinge (4a) and the second hinge (4b) are slidably connected to the rear mounting base (3). The front mounting base (2) has a through groove (210) with a front-to-back orientation. A movable part (5) is also hinged to the pivot (410). The front end of the movable part (5) is slidably connected to the front mounting base (2) through the through groove (210). When the lumbar support unit (1) is pulled forward or backward, the cross hinge rod unfolds forward or folds backward as a whole, the front mounting seat (2) moves forward and backward relative to the rear mounting seat (3), the pivot (410) slides forward and backward relative to the front mounting seat (2) along the axis of the cross hinge rod, thereby driving the movable part (5) to slide forward and backward relative to the front mounting seat (2). A gear adjustment mechanism is provided between the movable part (5) and the front mounting seat (2). The gear adjustment mechanism is configured to stop the movable part (5) at the current sliding position, thereby causing the lumbar support unit (1) to be suspended at the current depth. When the lumbar support unit (1) slides to its last end, the movable part (5) is inserted into the front mounting seat (2), and the cross hinge folds back until the first hinge (4a), the second hinge (4b), the front mounting seat (2) and the rear mounting seat (3) are close to each other and approach parallel.

2. The compact lumbar support depth adjustment device according to claim 1, characterized in that, The movable part (5) is provided with a protrusion (510), and a plurality of gear slots (511) arranged in a front-back direction are recessed on one side of the protrusion (510). The gear adjustment mechanism also includes an elastic lever (6). One end of the elastic lever (6) is connected to the front mounting base (2), and the other end is provided with a lock head (610) that engages with the gear slot (511). The elastic lever (6) applies a spring force to the lock head (610) to engage in the direction of the gear slot (511). When the movable part (5) slides back and forth along the through groove (210), the lock head (610) engages with the plurality of gear slots (511) in sequence under the action of the elastic lever (6).

3. The compact lumbar support depth adjustment device according to claim 2, characterized in that, The top of the movable part (5) is recessed and provided with a mounting groove (520). The protrusion (510) is provided in the mounting groove (520), and an annular gap is formed between the protrusion (510) and the groove wall of the mounting groove (520). The gap between the side of the protrusion (510) with the gear slot (511) and the groove wall of the mounting groove (520) forms an adjustment channel (521). The gap between the side of the protrusion (510) with the gear slot (511) and the groove wall of the mounting groove (520) forms a reset channel (522). When the movable part (5) slides forward along the through groove (210), the lock head (610) slides in the adjustment channel (521). When the movable part (5) slides backward along the through groove (210), the lock head (610) slides in the reset channel (522).

4. The compact lumbar support depth adjustment device according to claim 3, characterized in that, The gear slot (511) is tilted backward from the side near the adjustment channel (521) to the side near the reset channel (522).

5. The compact lumbar support depth adjustment device according to claim 3, characterized in that, The elastic lever (6) is an elastic rod. The front end of the elastic lever (6) is fixed to the front mounting base (2), and the rear end is bent downward to form the lock head (610). The top of the front mounting base (2) is hollowed out with a clearance hole (220). The clearance hole (220) is connected to the through groove (210). The lock head (610) passes through the clearance hole (220) and enters the through groove (210).

6. The compact lumbar support depth adjustment device according to claim 1, characterized in that, The front end of the rear mounting base (3) is recessed to form a connecting groove (310) extending in the left-right direction. The rear ends of the first hinge (4a) and the second hinge (4b) are slidably connected to the rear mounting base (3) through the connecting groove (310). The middle part of the rear mounting base (3) protrudes to form a backrest connecting part (320). The backrest connecting part (320) divides the connecting groove (310) into two parts, and a first elastic element (330) is provided between the side wall of the backrest connecting part (320) and the first hinge (4a) and the second hinge (4b). The first elastic element (330) acts on the first hinge (4a) and the second hinge (4b), so that the first hinge (4a) and the second hinge (4b) always have the tendency to slide outward.

7. The compact lumbar support depth adjustment device according to claim 1, characterized in that, The first hinge rod (4a) has a first opening (401) in the middle, the second hinge rod (4b) passes through the first opening (401), the second hinge rod (4b) has a second opening (402) in the middle, and the rear end of the movable member (5) passes through the second opening (402). The first hinge rod (4a), the second hinge rod (4b) and the movable member (5) are stacked together in an alternating manner.

8. The compact lumbar support depth adjustment device according to claim 1, characterized in that, The first hinge (4a) and the second hinge (4b) are both bent toward the axis of the cross hinge to form a bent portion (420). The first hinge (4a) and the second hinge (4b) are both hinged through the bent portions (420) on the front and rear sides and the front mounting seat (2) and the rear mounting seat (3).

9. The compact lumbar support depth adjustment device according to claim 1, characterized in that, The front mounting base (2) is provided with a first rotating part (230) at its front end, and the lumbar support unit (1) is provided with a second rotating part (110) at its rear end. The first rotating part (230) is hinged to the second rotating part (110), so that the lumbar support unit (1) can rotate up and down relative to the front mounting base (2).

10. The compact lumbar support depth adjustment device according to claim 9, characterized in that, A rotation limiting groove (240) is hollowed out on the front mounting base (2) opposite the second rotating part (110). The rear end of the second rotating part (110) extends to form a limiting protrusion (111). The limiting protrusion (111) is inserted into the rotation limiting groove (240). A second elastic element (120) is provided between the limiting protrusion (111) and the bottom of the rotation limiting groove (240). Under the elastic force of the second elastic element (120), the limiting protrusion (111) always has an upward rotation tendency.

11. A type of seat, characterized in that, The chair back unit (7) includes a backrest unit (7) and a compact lumbar support depth adjustment device as described in any one of claims 1-10. The backrest unit (7) includes a lumbar support mounting portion (710) extending forward from the center. The rear mounting seat (3) is provided with a backrest connecting portion (320) at the center. The backrest connecting portion (320) is detachably connected to the lumbar support mounting portion (710), so that the compact lumbar support depth adjustment device is detachably connected to the backrest unit (7).

12. The seat according to claim 11, characterized in that, The backrest connecting part (320) and the lumbar support mounting part (710) are detachably connected by screws. The lumbar support mounting part (710) has a recessed receiving groove (711) on its rear side. The screw passes through the bottom of the receiving groove (711) and is screwed to the backrest connecting part (320). The lumbar support mounting part (710) is also covered with a cover (720), which is configured to cover the receiving groove (711).

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