Waist panel spacing segmented adjustment structure

Abstract

This application discloses a segmented adjustment structure for waist panel spacing, including a fixed base and a pair of support arms movably connected to the fixed base on the left and right. A central lumbar support is connected to the front end of the fixed base. The end of each support arm away from the fixed base is bent forward and connected to a waist panel. The two support arms are connected by a linkage mechanism, which includes a pair of front and rear linkage members. The middle parts of the two linkage members cross each other and are hinged together. The left and right ends of the two linkage members are slidably connected to the support arms on the corresponding sides. The rear end of the linkage member on the rear side has a plurality of first ratchet teeth with the tips facing backward and arranged in a circumferential array centered on the hinge point. A ratchet member is slidably connected to the fixed base along the front and rear direction. The ratchet member and the fixed base are fixed relative to each other in the circumferential direction. The hinge point of the ratchet member and the linkage member is coaxially arranged. The front end of the ratchet member is provided with a plurality of second ratchet teeth that mesh with the first ratchet teeth. The ratchet member and the fixed base are connected by an elastic member.

Description

Technical Field

[0001] This invention relates to the field of seating technology, specifically to a segmented adjustable structure for the lumbar support spacing. Background Technology

[0002] Lumbar supports are common components on seating used to support the lower back, effectively relieving problems such as lower back muscle strain and excessive pressure on the lumbar spine caused by prolonged sitting. To improve the support experience of lumbar supports and make them suitable for users of various body types, a three-zone lumbar support has emerged on the market. It includes a central lumbar support body and symmetrically arranged lumbar panels on both sides of the body. The lumbar panels on both sides support the user's lower back, providing a comfortable wrapping sensation and more comprehensive lumbar support, further relieving fatigue.

[0003] Furthermore, to make the three-zone lumbar support more adaptable to users of various body types, the inventors have provided a three-zone lumbar support with adjustable lumbar spacing, as shown in the attached figure. Figure 11 As shown, the lumbar support body is fixedly connected to a support base 10, and the lumbar pieces are respectively connected to a connecting arm 11. The inner cavity of the support base 10 is open from left to right. The connecting arms 11 on both sides are inserted into the left and right ends of the support base 10 and can slide relative to each other in the left and right direction to adjust the spacing, thereby adapting to users with different waist widths. In addition, the inner wall of the support base 10 has multiple horizontally arranged locking holes 1010, and each connecting arm 11 on each side is provided with a spring plunger 1110 for engaging with the locking holes 1010. When adjusting the spacing of the lumbar pieces, as the connecting arm 11 slides, the spring plunger 1110 engages with the multiple locking holes 1010 in sequence, so that the lumbar pieces can be suspended in multiple adjustment positions.

[0004] However, after actual use, the inventors found the following problems with the above solution: users need to manually push and pull the waist piece to adjust the spacing, which is troublesome. Also, when the spring plunger 1110 is inserted into any of the holes, the position of the waist piece is fixed and cannot automatically move inward to clamp the user's waist, resulting in insufficient wrapping sensation.

[0005] To achieve adaptive adjustment of the lumbar support spacing, if the aforementioned spring plunger 110 and locking hole 1010 are removed, and a tension spring is added between the two connecting arms 11 to provide inward pulling force, the initial spacing between the two lumbar supports will be smaller. When the user sits down, their waist will compress outward, spreading the lumbar supports apart. The tension spring will be stretched and deformed by the connecting arms 11 on both sides. With the return force of the tension spring, the connecting arms 11 on both sides will tend to retract inward, thereby causing the lumbar supports to automatically clamp the user's waist inward. Although this solution achieves adaptive adjustment of the lumbar supports, the clamping force provided by the lumbar supports will be directly affected by the deformation of the tension spring. That is, when the spacing between the lumbar supports is large, the deformation of the tension spring will be too large, resulting in excessive clamping force for users with wider waists, thus worsening the experience. Summary of the Invention

[0006] In view of the aforementioned defects or deficiencies in the prior art, it is desirable to provide a segmented adjustment structure for the waist slat spacing. By hinged together at the middle of two connecting parts to form a structure similar to a cross linkage, the two connecting parts rotate synchronously, and their ends move by the same distance, so that the two waist slats move synchronously, the transmission process is relatively stable, and the waist slat spacing adjustment operation is very simple. Furthermore, multiple first ratchet teeth are integrated into the connecting parts. When the support arms on both sides are extended, they drive the connecting parts and the first ratchet teeth to rotate synchronously. The inclined tooth surface of the first ratchet teeth presses against the second ratchet teeth, thereby forcing the ratchet teeth to overcome the elastic force of the elastic element and retract backward. The return elastic force of the elastic element, in turn, drives the waist slats to adaptively close inward to clamp the user's waist, providing comfortable adaptive waist support. When the first ratchet teeth rotate to pass the current second ratchet teeth and fully engage with the next second ratchet teeth, the deformation of the elastic element is restored to its initial state, so that the maximum working deformation of the elastic element is basically consistent in different settings, thereby ensuring that users with different waist widths can obtain the same size, soft and comfortable clamping force.

[0007] The beneficial effects of this invention are achieved as follows:

[0008] This application provides a segmented adjustment structure for waist panel spacing, including a fixed base and a pair of support arms that are movably connected to the fixed base on the left and right. A central lumbar support is connected to the front end of the fixed base, and the end of each support arm away from the fixed base is bent forward and connected to a waist panel.

[0009] The two arms are connected by a linkage mechanism, which includes a pair of front and rear linkages. The middle of the two linkages crosses each other and is hinged together. The left and right ends of the two linkages are slidably connected to the corresponding arms. When the two linkages rotate relative to each other, the linkage mechanism expands or retracts as a whole. The two arms move outward or inward synchronously under the push and pull of the linkage mechanism.

[0010] The rear end of the connecting component located on the rear side has multiple first ratchet teeth with rearward-facing tips, arranged in a circumferential array around the hinge point. A ratchet component is slidably connected to the fixed base along the front-rear direction. The ratchet component and the fixed base are fixed relative to each other in the circumferential direction. The hinge point of the ratchet component and the connecting component are coaxially arranged. The front end of the ratchet component has multiple second ratchet teeth that mesh with the first ratchet teeth. The ratchet component and the fixed base are connected by an elastic component. The elastic force of the elastic component acts on the ratchet component, causing the ratchet component to tend to move towards the connecting component.

[0011] When the two side panels are subjected to an outward stretching force, the support arm extends outward and drives the connecting component to rotate. Multiple first ratchet teeth move in a circular motion with the connecting component. The inclined tooth surfaces of the first and second ratchet teeth press against each other and force the ratchet component to retract backward. The first and second ratchet teeth are not fully engaged. The elastic element generates elastic deformation and applies a forward reset force to the ratchet component. Then, the second ratchet teeth press against the first ratchet teeth, causing the connecting component to reset, thus making the support arm and side panels tend to retract inward. When the side panels are pulled outward further until the first ratchet teeth pass the current second ratchet teeth and fully engage with the next second ratchet teeth, the deformation of the elastic element is restored, and the side panels are suspended at the current position.

[0012] Furthermore, the fixed base has shift slots extending left and right and spaced apart. Each side of the support arm is equipped with an elastic locking member that slides in conjunction with the shift slot. When the two side waist pieces are subjected to an outward pulling force, the elastic locking member slides along one side of the shift slot. When the waist piece is pulled further outward until the first ratchet passes the current second ratchet and fully engages with the second ratchet on the next side, the elastic locking member disengages from the current shift slot and enters the next shift slot. The elastic locking member and the shift slots provide continuous and precise lateral limiting and guiding for the support arm. When the waist piece spacing segmented adjustment structure switches gears, the first ratchet needs to overcome not only the elastic force of the elastic member but also the stop of the shift slot wall on the elastic locking member to pass the current second ratchet, making the boundaries between each gear clear and the waist piece spacing adjustment operation precise and reliable.

[0013] Furthermore, both tooth surfaces of the first ratchet are inclined, including a driving surface and a retraction surface; the two tooth surfaces of the second ratchet are also inclined, including a bearing surface and a return surface. When the two connecting parts extend outward, the driving surface and the bearing surface press against each other; when the two connecting parts retract inward, the retraction surface and the return surface press against each other. This ensures that the ratchet parts can move back and forth regardless of which direction the connecting parts rotate. This allows the waist piece to move freely in both left and right directions.

[0014] Furthermore, the inclinations of the driving surface and the bearing surface are similar, as are the inclinations of the exit surface and the return surface, with the exit surface having a greater inclination than the driving surface. This results in a smaller stroke during lumbar support reset and a larger stroke available for adaptive adjustment of the lumbar support. Additionally, it prevents the first ratchet from directly overtaking the second ratchet on the upper side when the lumbar support wobbles or vibrates in the initial state, effectively avoiding gear rebound.

[0015] Furthermore, the inclination of the driving surface and the bearing surface is 15-30°, and the inclination of the exit surface and the return surface is 60-75°. This ensures that the axial thrust of the elastic element is efficiently converted into the circumferential rotational force of the driving link, making the waist plate spacing adjustment operation smooth and stable, and also allowing for a longer stroke during waist plate adaptive adjustment; moreover, during ratchet shifting and resetting, the two tooth surfaces can quickly and cleanly separate and engage, providing clear feedback.

[0016] Furthermore, the linkage mechanism also includes a columnar support column, which is detachably connected to the fixed base. The linkage component includes a central annular sleeve, and both linkage components are sleeved onto the support column through the sleeve, allowing the two linkage components to rotate coaxially. With the support column axially fixed, the rotation adjustment operation of the two linkage components is more stable, and the assembly operation of the linkage mechanism is more convenient.

[0017] Furthermore, the support column has a through mounting hole, and the end of the ratchet near the connecting member has a recessed splicing groove with a through connecting hole at the bottom. The end of the support column passes through the sleeve and engages with the splicing groove, and the mounting hole and connecting hole are coaxial. The support column is connected to the fixing seat by screws, with the screw thread passing through the mounting hole and connecting hole and screwed to the fixing seat. This not only ensures precise engagement of the first and second ratchet teeth but also significantly simplifies the assembly process and provides strong centering.

[0018] Furthermore, the mounting base has a split structure, including a front cover and a mounting shell that are spliced ​​together. The mounting shell has a recessed connecting cavity that runs through the left and right sides, and the support arms on both sides are movably connected to the mounting base through the connecting cavity. This makes the segmented adjustment structure of the lumbar support spacing more compact and the assembly operation simpler.

[0019] Furthermore, a movable support groove is recessed at the front end of the fixed shell, through which the ratchet is movably connected to the fixed shell. Several positioning protrusions protrude from the side wall of the ratchet, and corresponding positioning grooves are recessed on the wall of the movable support groove. The positioning protrusions and positioning grooves slide together, fixing the ratchet and the fixed seat relatively in the circumferential direction. The positioning protrusions and positioning grooves apply circumferential constraints to the ratchet, effectively improving the stability of the waist plate spacing adjustment operation.

[0020] Furthermore, each support arm has a perforated limiting groove extending in the left-right direction. A mounting post extending in the front-back direction is installed inside the fixed housing. The mounting post engages with the limiting groove, and moves along the limiting groove when the support arm moves left or right. The front end of the mounting post abuts against the front cover, and the mounting post and the front cover are detachably connected by screws. This not only limits the range of motion of the connecting arm, resulting in a stronger connection between the support arm and the fixed base and better stability of the adjustment operation, but the mounting post also serves to connect the front cover and the fixed housing, making the assembly operation between the front cover and the fixed housing simpler.

[0021] Furthermore, each side of the support arm has a pair of symmetrical vertical guide slots near the end of the connecting member. The end of the connecting member near the support arm protrudes in a front-to-back direction to form a locking head, which engages with the corresponding guide slot. When the connecting member rotates, the locking head slides along the guide slot. This not only enhances the connection strength and stability between the connecting member and the support arm, improving the stability of the transmission process between them, but also ensures that the two connecting members remain connected to the support arm, further improving the stability of the transmission process between the connecting member and the support arm, as the locking head slides along the vertical guide slot.

[0022] The waist plate spacing segment adjustment structure provided in this application forms a cross-link-like structure by hinged the middle of two connecting parts together. When the waist plate and support arm on one side are unfolded, the two connecting parts are pulled and rotated synchronously, and the ends on both sides move the same distance. This pushes and pulls the waist plate and support arm on the other side to move inward or outward synchronously by the same distance. That is, the two waist plates keep moving synchronously, the transmission process is relatively stable, and the waist plate spacing adjustment operation is very simple.

[0023] Furthermore, the lumbar support spacing adjustment mechanism includes an initial state and an adaptive state. In the initial state, when the user is not seated, the distance between the two lumbar supports is less than the user's waist width. At this time, the first and second ratchet teeth are fully engaged, and the lumbar supports are suspended in the current position. When the user sits down, the waist will compress and expand the lumbar supports on both sides. At this time, the lumbar support spacing adjustment mechanism enters the adaptive state. Since the first ratchet is integrated into the connecting member, when the support arms on both sides are extended, they will drive the connecting member and the first ratchet to rotate synchronously. The inclined tooth surface of the first ratchet and the second ratchet press against each other, but they are not fully engaged. This forces the ratchet to overcome the elastic force of the elastic element and retract backward. At this time, the restoring force generated by the elastic element is transmitted through the tooth surface. The connecting member and the support arms have a tendency to retract inward, thereby driving the lumbar supports to adaptively retract inward and clamp the user's waist. The user does not need to bend over and manually push or pull the lumbar supports, providing comfortable adaptive lumbar support. When the user's waist width exceeds the adaptive range of the current setting, and the lumbar support is further stretched, the first ratchet can rotate past the current second ratchet and, pushed by the elastic element, fully engage with the next adjacent second ratchet. When the first and second ratchets fully engage again, the elastic element's deformation returns to its initial state. This means that regardless of the lumbar support's adjustment setting, the elastic element will return to the same initial deformation when the lumbar support is statically suspended. The maximum working deformation of the elastic element remains essentially consistent across different settings, ensuring that users with different waist widths receive the same gentle and comfortable clamping force. Attached Figure Description

[0024] 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:

[0025] Figure 1 A three-dimensional structural diagram of the lumbar support provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the back structure of the lumbar support provided in an embodiment of this application;

[0027] Figure 3 A schematic diagram illustrating the state change of the lumbar support when adjusting the lumbar support spacing, as provided in an embodiment of this application.

[0028] Figure 4 A schematic diagram of the connection structure between the fixed base, support arm, waist plate and central lumbar support provided in the embodiments of this application;

[0029] Figure 5 This is a schematic diagram of the connection structure between the support arm and the fixed base provided in an embodiment of this application;

[0030] Figure 6 A three-dimensional structural diagram of the support arm provided in an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the connection structure between the linkage mechanism and the fixed shell provided in an embodiment of this application;

[0032] Figure 8 A schematic diagram illustrating the state changes between the connecting member and the ratchet member when the connecting member rotates, as provided in an embodiment of this application.

[0033] Figure 9 This is a schematic diagram illustrating the state changes of the linkage mechanism in its initial state, as provided in an embodiment of this application.

[0034] Figure 10 This is a schematic diagram illustrating the state changes of the linkage mechanism under adaptive conditions, provided in an embodiment of this application.

[0035] Figure 11 This is a schematic diagram of the internal structure of a three-zone lumbar support with adjustable lumbar spacing provided by the inventor.

[0036] The reference numerals in the attached drawings are as follows: 1-fixed base, 1a-front cover, 1b-fixed shell, 101-connecting cavity, 110-gear slot, 120-movable support slot, 121-positioning slot, 130-mounting post, 140-mounting protrusion, 2-support arm, 210-elastic locking element, 220-limiting slot, 230-guide slot, 240-mounting slot, 3-center lumbar support, 310-mounting port, 4-waist plate, 5-connecting element, 510-first ratchet, 510a-drive surface, 510b-exit surface, 520-sleeve part, 530-clamp head, 6-racket element, 610-second ratchet, 610a-bearing surface, 610b-return surface, 620-joining slot, 630-connecting hole, 640-positioning protrusion, 7-elastic element, 8-support post, 810-mounting hole, 9-hinge. Detailed Implementation

[0037] 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.

[0038] Please refer to the attached document. Figure 1-10 This application provides a segmented adjustment structure for waist panel spacing, including a fixed base 1 and a pair of support arms 2 that are movably connected to the fixed base 1 on the left and right. A central waist support 3 is connected to the front end of the fixed base 1, and the end of each support arm 2 away from the fixed base 1 is bent forward and connected to a waist panel 4.

[0039] The two support arms 2 are connected by a linkage mechanism. The linkage mechanism includes a pair of front and rear linkage parts 5. The middle parts of the two linkage parts 5 cross each other and are hinged together. The left and right ends of the two linkage parts 5 are slidably connected to the support arms 2 on the corresponding sides, so that when the two linkage parts 5 rotate relative to each other, the linkage mechanism unfolds or retracts as a whole. The two support arms 2 move outward or inward synchronously under the push and pull of the linkage mechanism.

[0040] The rear end of the connecting member 5 located on the rear side has a plurality of first ratchet teeth 510 with the tips facing backward and arranged in a circular array around the hinge point. The ratchet member 6 is slidably connected to the fixed base 1 along the front-back direction. The ratchet member 6 and the fixed base 1 are fixed relative to each other in the circumferential direction. The ratchet member 6 and the hinge point of the connecting member 5 are coaxially arranged. The front end of the ratchet member 6 is provided with a plurality of second ratchet teeth 610 that mesh with the first ratchet teeth 510. The ratchet member 6 and the fixed base 1 are connected by an elastic member 7. The elastic force of the elastic member 7 acts on the ratchet member 6, so that the ratchet member 6 has a tendency to move toward the connecting member 5.

[0041] When the two side waist plates 4 are subjected to an outward spreading force, the support arm 2 unfolds outward and drives the connecting member 5 to rotate. Multiple first ratchet teeth 510 move in a circular motion with the connecting member 5. The inclined tooth surfaces of the first ratchet teeth 510 and the second ratchet teeth 610 press against each other and force the ratchet member 6 to retract backward. The first ratchet teeth 510 and the second ratchet teeth 610 are not fully engaged. The elastic member 7 generates elastic deformation and applies a forward reset force to the ratchet member 6. Then, the second ratchet teeth 610 press against the first ratchet teeth 510 and drive the connecting member 5 to reset, so that the support arm 2 and the waist plate 4 have a tendency to retract inward. When the waist plate 4 is pulled outward further until the first ratchet teeth 510 pass the current second ratchet teeth 610 and fully engage with the next second ratchet teeth 610, the deformation of the elastic member 7 is restored, and the waist plate 4 is suspended in the current position.

[0042] In this embodiment, by hinged together at the middle of the two connecting parts 5 to form a structure similar to a cross linkage, when the waist piece 4 and the support arm 2 on one side are unfolded, the two connecting parts 5 are pulled and rotated synchronously, and the ends on both sides move the same distance, thereby pushing and pulling the waist piece 4 and the support arm 2 on the other side synchronously inward or outward by the same distance. That is, the two waist pieces 4 keep moving synchronously, the transmission process is relatively stable, and the operation of adjusting the spacing of the waist pieces 4 is very simple.

[0043] Furthermore, the lumbar support spacing adjustment mechanism includes an initial state and an adaptive state. In the initial state, when the user is not seated, the distance between the two lumbar supports 4 is less than the user's waist width. At this time, the first ratchet 510 and the second ratchet 610 are fully engaged, and the lumbar supports 4 are suspended in the current position. When the user sits down, the waist will compress and expand the lumbar supports 4 on both sides outward. At this time, the lumbar support spacing adjustment mechanism enters the adaptive state, as shown in the attached diagram. Figure 8-10As shown, since the first ratchet 510 is integrated into the connecting member 5, when the support arms 2 on both sides are extended, the connecting member 5 and the first ratchet 510 will rotate synchronously. The inclined tooth surface of the first ratchet 510 and the second ratchet 610 are pressed against each other, but they are not fully engaged. This forces the ratchet member 6 to overcome the elastic force of the elastic member 7 and retract backward. At this time, the restoring force generated by the elastic member 7 is transmitted through the tooth surface. The connecting member 5 and the support arm 2 have a tendency to retract inward, thereby driving the waist plate 4 to adaptively retract inward to clamp the user's waist. The user does not need to bend over and manually push or pull the waist plate 4, providing comfortable adaptive waist support. When the user's waist width exceeds the adaptive range of the current gear, the waist plate 4 is further stretched. The first ratchet 510 can rotate to pass the current second ratchet 610 and, under the push of the elastic member 7, fully engage with the next adjacent second ratchet 610. When the first ratchet 510 and the second ratchet 610 are fully engaged again, the deformation of the elastic element 7 is restored to its initial state. This means that no matter which adjustment position the waist plate 4 is in, the elastic element 7 will be restored to the same initial deformation when the waist plate 4 is statically suspended. The maximum working deformation of the elastic element 7 is basically the same in different positions, thus ensuring that users with different waist widths can obtain the same size, soft and comfortable clamping force.

[0044] Please refer to the appendix. Figure 3 and attached Figure 4 The lumbar support 4 and the support arm 2 are hinged together by a hinge 9, meaning that the lumbar support 4 can also rotate left and right relative to the central lumbar support 3. Furthermore, the two plates of the hinge 9 are hinged together by a torsion spring, allowing the lumbar support 4 to automatically rotate inward to fit the tilt angle of the user's waist, improving the adjustability of the lumbar support and making the support experience more comfortable.

[0045] Please refer to the attached document. Figure 5 and attached Figure 6 In some embodiments of this application, the fixed base 1 is provided with a gear slot 110 extending in the left-right direction and spaced apart on the left and right. Each side of the support arm 2 is provided with an elastic locking member 210 that slides in cooperation with the gear slot 110. When the two side waist pieces 4 are subjected to an outward spreading force, the elastic locking member 210 slides along the gear slot 110 on one side. And when the waist piece 4 is further pulled outward until the first ratchet 510 passes the current second ratchet 610 and is fully engaged with the second ratchet 610 on the next side, the elastic locking member 210 disengages from the current gear slot 110 and enters the gear slot 110 on the next side.

[0046] In this embodiment, during the adaptive adjustment of the waist slat spacing 4, the elastic locking member 210 always slides within the current gear slot 110, providing continuous and precise lateral limiting and guidance for the support arm 2. Furthermore, when the first ratchet 510 and the second ratchet 610 complete a gear shift engagement, the elastic locking member 210 simultaneously disengages from the current gear slot 110 and falls into the next gear slot 110. That is, when the waist slat spacing segmented adjustment structure switches gears, the first ratchet 510, when passing the current second ratchet 610, not only needs to overcome the elastic force of the elastic member 7 but also needs to overcome the stop of the gear slot 110 wall on the elastic locking member 210. When the first ratchet 510 is fully engaged with the second ratchet 610 on the next side, and when the elastic locking member 210 is engaged in the gear slot 110 on the next side, both provide significant vibration and sound feedback, making the boundaries between each gear clear and avoiding problems such as ratchet jamming or rebound in the adaptive state. This ensures that the waist slat spacing adjustment operation is precise and reliable.

[0047] Preferably, the elastic locking element 210 is a spring plunger. The steel ball on the spring plunger always tends to engage with the gear slot 110 under the force of the spring, and can move between multiple gear slots 110 by means of the elastic deformation of the spring, so that the movement adjustment operation of the support arm 2 is relatively smooth and stable. The front side of the support arm 2 is recessed to form a mounting groove 240, and the elastic locking element 210 is embedded in the support arm 2 through the mounting groove 240.

[0048] Preferably, the fixed base 1 has two spaced-apart slots 110 on each of its left and right sides, meaning that the waist support spacing adjustment structure has at least two adjustable positions, which are respectively adapted to users with larger and smaller waist supports.

[0049] Please refer to the attached document. Figure 8 In some embodiments of this application, the two tooth surfaces of the first ratchet 510 are both inclined, including a driving surface 510a and a retraction surface 510b. The two tooth surfaces of the second ratchet 610 are also inclined, including a bearing surface 610a and a return surface 610b. When the two connecting members 5 are extended outward, the driving surface 510a and the bearing surface 610a press against each other. When the two connecting members 5 are retracted inward, the retraction surface 510b and the return surface 610b press against each other. This allows the ratchet member 6 to move back and forth regardless of which direction the connecting members 5 rotate.

[0050] In this embodiment, by tilting both tooth surfaces of the first ratchet 510 and the second ratchet 610, the waist piece 4 can move freely in both left and right directions. When it is necessary to reset the spacing between the two waist pieces 4, it is only necessary to push the waist piece 4 inward in the initial state. Under the rotation of the connecting member 5, the exit surface 510b and the return surface 610b press against each other, forcing the ratchet member 6 to retract backward until the first ratchet 510 completely passes over the current second ratchet 610 and fully engages with the second ratchet 610 on the upper side. The segmented adjustment structure of the waist piece spacing returns to the previous position, making the spacing reset operation of the waist piece 4 relatively simple.

[0051] Please refer to the attached document. Figure 8 In some embodiments of this application, the inclination of the driving surface 510a and the bearing surface 610a are similar, the inclination of the exit surface 510b and the return surface 610b are similar, and the inclination of the exit surface 510b is greater than that of the driving surface 510a.

[0052] In this embodiment, the inclination of the exit surface 510b is greater than that of the drive surface 510a. This means that during the retraction and reset stroke of the waist rest 4, the slope of the tooth surface where the first ratchet 510 and the second ratchet 610 press against each other is steeper. On the one hand, this makes the stroke of the waist rest 4 during reset smaller, while the stroke that the waist rest 4 can adaptively adjust is larger. On the other hand, it makes it less likely that the first ratchet 510 will directly pass over the second ratchet 610 on the upper side when the waist rest shakes or vibrates in the initial state, thus effectively avoiding gear rebound.

[0053] Please refer to the attached document. Figure 8 In some embodiments of this application, the inclination of the driving surface 510a and the bearing surface 610a is 15-30°, and the inclination of the exit surface 510b and the return surface 610b is 60-75°.

[0054] In this embodiment, after testing and verification, the 15-30° angle range ensures that the axial thrust of the elastic element 7 is efficiently converted into the circumferential rotational force of the driving link 5, without causing self-locking due to excessively small angles. This results in smooth and stable adjustment of the waist plate spacing, and also allows for a longer circumferential length of the driving surface 510a and the bearing surface 610a, leading to a longer stroke during the adaptive adjustment of the waist plate 4. Furthermore, setting the inclination of the exit surface 510b and the return surface 610b within the range of 60-75° ensures that the two tooth surfaces can quickly and cleanly separate and engage during ratchet shifting and resetting, providing clear feedback. At the same time, the steeper tooth surface structure has higher strength and wear resistance, extending the service life of the segmented waist plate spacing adjustment structure.

[0055] Please refer to the attached document. Figure 5 and attached Figure 7In some embodiments of this application, the linkage mechanism further includes a columnar support column 8, which is detachably connected to the fixed base 1. The linkage member 5 includes a central annular sleeve portion 520. Both linkage members 5 are sleeved onto the support column 8 through the sleeve portion 520, allowing the two linkage members 5 to rotate coaxially. With the support column 8 axially fixed, the rotation adjustment operation of the two linkage members 5 is more stable. Furthermore, when installing the linkage mechanism, it is only necessary to sleeve the two linkage members 5 onto the support column 8 and then connect and fix the support column 8 to the fixed base 1, making assembly relatively convenient. Moreover, the support column 8 has a stepped structure that is thicker at the front and thinner at the inside, ensuring that when the support column 8 fixes the two linkage members 5 together to the fixed base 1, the linkage members 5 cannot detach from the support column 8, resulting in good stability.

[0056] Please refer to the attached document. Figure 7 and attached Figure 9 In some embodiments of this application, the support column 8 is provided with a through mounting hole 810, the ratchet 6 is recessed at one end near the connecting member 5 to form a splicing groove 620, and the bottom of the splicing groove 620 is provided with a through connecting hole 630; the end of the support column 8 passes through the sleeve part 520 and is engaged in the splicing groove 620, and the mounting hole 810 and the connecting hole 630 are coaxial; the support column 8 is connected to the fixing base 1 by screws, and the screw shank passes through the mounting hole 810 and the connecting hole 630 and is screwed to the fixing base 1.

[0057] In this embodiment, the end of the support column 8 is embedded in the splicing groove 620 of the ratchet 6, realizing the coaxial fixation of the connecting piece 5, the ratchet 6 and the support column 8. This not only ensures the precise meshing of the first ratchet 510 and the second ratchet 610, but also allows the connecting piece 5, the ratchet 6 and the support column 8 to be directly fastened to the fixing base 1 by passing a screw through the mounting hole 810 of the support column 8 and the connecting hole 630 of the ratchet 6. This greatly simplifies the assembly process and provides strong centering.

[0058] Please refer to the attached document. Figure 5 and attached Figure 7 In some embodiments of this application, the fixing base 1 is a split structure, including a front cover 1a and a fixing shell 1b spliced ​​together. A connecting cavity 101 that runs through the left and right sides is recessed on the fixing shell 1b, and the support arms 2 on both sides are movably connected to the fixing base 1 through the connecting cavity 101.

[0059] In this embodiment, a split splicing structure of front cover 1a and fixed shell 1b is adopted. The connecting cavity 101 can be directly injection molded with the fixed shell 1b. Moreover, the staff can first assemble all internal components such as the linkage mechanism, ratchet 6, and elastic element 7 in the open fixed shell 1b. After inspection and confirmation, the front cover 1a is finally fastened, making the segmented adjustment structure of the lumbar support spacing more compact and the assembly operation more convenient.

[0060] Please refer to the appendix. Figure 4 The central lumbar support 3 and the front cover 1a are also detachably connected by screws. The rear side of the central lumbar support 3 has a recessed mounting opening 310, and the front side of the front cover 1a has a mounting protrusion 140. When the front cover 1a is installed on the central lumbar support 3, the mounting protrusion 140 is engaged with the mounting opening 310 to assist in positioning, so that the positioning between the front cover 1a and the central lumbar support 3 is accurate and easy to install.

[0061] Please refer to the attached document. Figure 7 In some embodiments of this application, a movable support groove 120 is formed in the front end of the fixed shell 1b. The ratchet 6 is movably connected to the fixed shell 1b through the movable support groove 120. A plurality of positioning protrusions 640 are formed on the side wall of the ratchet 6. A plurality of positioning grooves 121 are formed in the groove wall of the movable support groove 120. The positioning protrusions 640 and the positioning grooves 121 slide in fit, so that the ratchet 6 and the fixed seat 1 are relatively fixed in the circumferential direction.

[0062] In this embodiment, the circumferential constraint is applied to the ratchet 6 by the positioning protrusion 640 and the positioning groove 121, so that the ratchet 6 only has the translational freedom along the front and rear directions along the movable support groove 120. This fundamentally eliminates the problem of the ratchet 6 rotating slightly under the pushing force of the elastic member 7 or the squeezing force of the first ratchet 510, which would lead to problems such as ratchet skipping and slipping. This effectively improves the stability of the waist plate spacing adjustment operation.

[0063] Please refer to the attached document. Figure 6 and attached Figure 7 In some embodiments of this application, the support arm 2 is hollowed out and has a limiting groove 220 extending in the left-right direction. The fixed shell 1b is provided with a mounting post 130 extending in the front-back direction. The mounting post 130 is inserted into the limiting groove 220. When the support arm 2 moves left and right, the mounting post 130 moves along the limiting groove 220. The front end of the mounting post 130 abuts against the front cover 1a. The mounting post 130 and the front cover 1a are detachably connected by screws.

[0064] In this embodiment, the sliding fit between the mounting post 130 and the limiting groove 220 not only restricts the range of motion of the connecting arm 2, making the connection strength between the support arm 2 and the fixed seat 1 higher and the stability of the adjustment operation better, but also the mounting post 130 serves to connect the front cover 1a and the fixed shell 1b, making the assembly operation between the front cover 1a and the fixed shell 1b simpler.

[0065] Please refer to the attached document. Figure 6In some embodiments of this application, each side of the support arm 2 near the end of the connecting member 5 is provided with a pair of vertically symmetrical guide grooves 230. The end of the connecting member 5 near the support arm 2 is provided with a locking head 530 extending in the front-back direction. The locking head 530 is engaged with the guide groove 230 on the corresponding side. When the connecting member 5 rotates, the locking head 530 slides along the guide groove 230.

[0066] In this embodiment, when the connecting member 5 rotates, its end makes a circular motion. That is, when the connecting member 5 pushes and pulls the support arm 2 left and right, the connecting member 5 also moves in the vertical direction relative to the support arm 2. Therefore, the connecting member 5 is engaged with the guide groove 230 on the support arm 2 through the locking head 530. This not only enhances the connection strength and stability between the connecting member 5 and the support arm 2 and improves the stability of the transmission process between them, but also, when the connecting member 5 rotates and pushes the support arm 2 left and right, the locking head 530 slides along the vertical guide groove 230, and the two connecting members 5 can remain connected to the support arm 2, thereby further improving the stability of the transmission process between the connecting member 5 and the support arm 2.

[0067] 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.

[0068] 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 segmented adjustable structure for waist panel spacing, characterized in that, It includes a fixed base (1) and a pair of support arms (2) that are movably connected to the fixed base (1) on the left and right. The front end of the fixed base (1) is connected to a central waist support (3). The end of each support arm (2) away from the fixed base (1) is bent forward and connected to a waist piece (4). The two arms (2) are connected by a linkage mechanism. The linkage mechanism includes a pair of front and rear linkages (5). The middle parts of the two linkages (5) cross each other and are hinged together. The left and right ends of the two linkages (5) are slidably connected to the corresponding arms (2). When the two linkages (5) rotate relative to each other, the linkage mechanism unfolds or retracts as a whole. The two arms (2) move outward or inward synchronously under the push and pull of the linkage mechanism. The rear end of the connecting member (5) located on the rear side has a plurality of first ratchet teeth (510) with the tips facing backward and arranged in a circular array around the hinge point. The fixed seat (1) is slidably connected to a ratchet member (6) along the front-back direction. The ratchet member (6) and the fixed seat (1) are fixed relative to each other in the circumferential direction. The ratchet member (6) and the hinge point of the connecting member (5) are coaxially arranged. The front end of the ratchet member (6) is provided with a plurality of second ratchet teeth (610) that mesh with the first ratchet teeth (510). The ratchet member (6) and the fixed seat (1) are connected by an elastic member (7). The elastic force of the elastic member (7) acts on the ratchet member (6), so that the ratchet member (6) has a tendency to move toward the connecting member (5). When the waist plates (4) on both sides are subjected to an outward spreading force, the support arm (2) unfolds outward and drives the connecting member (5) to rotate. The multiple first ratchet teeth (510) move in a circular motion with the connecting member (5). The inclined tooth surfaces of the first ratchet teeth (510) and the second ratchet teeth (610) press against each other and force the ratchet member (6) to retract backward. The first ratchet teeth (510) and the second ratchet teeth (610) are not fully engaged. The elastic member (7) undergoes elastic deformation and moves towards the ratchet member (6). Apply a forward reset force, which in turn squeezes the first ratchet (510) through the second ratchet (610) to drive the connecting member (5) to reset, thereby causing the support arm (2) and the waist plate (4) to have an inward tendency; when the waist plate (4) is pulled outward further until the first ratchet (510) passes the current second ratchet (610) and is fully engaged with the next second ratchet (610), the deformation of the elastic member (7) is restored, and the waist plate (4) is suspended in the current position.

2. The segmented adjustment structure for waist panel spacing according to claim 1, characterized in that, The fixed base (1) is provided with a gear slot (110) extending in the left and right direction and arranged at intervals. Each side of the support arm (2) is provided with an elastic locking member (210) that slides in cooperation with the gear slot (110). When the waist pieces (4) on both sides are subjected to an outward force, the elastic locking member (210) slides along the gear slot (110) on one side. When the waist piece (4) is pulled outward further until the first ratchet (510) passes the current second ratchet (610) and is fully engaged with the second ratchet (610) on the next side, the elastic locking member (210) disengages from the current gear slot (110) and enters the gear slot (110) on the next side.

3. The segmented adjustment structure for waist panel spacing according to claim 1, characterized in that, The first ratchet (510) has two inclined tooth surfaces, including a driving surface (510a) and a retraction surface (510b). The second ratchet (610) also has two inclined tooth surfaces, including a bearing surface (610a) and a return surface (610b). When the two connecting parts (5) are extended outward, the driving surface (510a) and the bearing surface (610a) press against each other. When the two connecting parts (5) are retracted inward, the retraction surface (510b) and the return surface (610b) press against each other. This allows the ratchet (6) to move back and forth regardless of which direction the connecting parts (5) rotate.

4. The segmented adjustment structure for waist panel spacing according to claim 3, characterized in that, The inclinations of the driving surface (510a) and the bearing surface (610a) are similar, the inclinations of the exit surface (510b) and the return surface (610b) are similar, and the inclination of the exit surface (510b) is greater than that of the driving surface (510a).

5. The segmented adjustment structure for waist panel spacing according to claim 4, characterized in that, The inclination of the driving surface (510a) and the bearing surface (610a) is 15-30°, and the inclination of the exit surface (510b) and the return surface (610b) is 60-75°.

6. The segmented adjustment structure for waist panel spacing according to claim 1, characterized in that, The linkage mechanism also includes a columnar support column (8), which is detachably connected to the fixed base (1). The linkage member (5) includes a central annular sleeve (520). Both linkage members (5) are sleeved on the support column (8) through the sleeve (520), so that the two linkage members (5) rotate coaxially.

7. The segmented adjustment structure for waist panel spacing according to claim 6, characterized in that, The support column (8) has a through mounting hole (810) on its front and back. The ratchet (6) has a recessed splicing groove (620) at one end near the connecting member (5), and the bottom of the splicing groove (620) has a through connecting hole (630). The end of the support column (8) passes through the sleeve (520) and is inserted into the splicing groove (620). The mounting hole (810) and the connecting hole (630) are coaxial. The support column (8) is connected to the fixing seat (1) by screws. The screw shank passes through the mounting hole (810) and the connecting hole (630) and is screwed to the fixing seat (1).

8. The segmented adjustment structure for waist panel spacing according to claim 1, characterized in that, The fixed base (1) is a split structure, including a front cover (1a) and a fixed shell (1b) spliced ​​together. A connecting cavity (101) is formed in the fixed shell (1b) that runs through the left and right sides. The support arms (2) on both sides are movably connected to the fixed base (1) through the connecting cavity (101).

9. The segmented adjustment structure for waist panel spacing according to claim 8, characterized in that, The front end of the fixed shell (1b) is recessed to form a movable support groove (120). The ratchet (6) is movably connected to the fixed shell (1b) through the movable support groove (120). A plurality of positioning protrusions (640) are formed on the side wall of the ratchet (6). A plurality of positioning grooves (121) are correspondingly recessed on the groove wall of the movable support groove (120). The positioning protrusions (640) and the positioning grooves (121) are slidably engaged, so that the ratchet (6) and the fixed seat (1) are relatively fixed in the circumferential direction.

10. The segmented adjustment structure for waist panel spacing according to claim 8, characterized in that, Each of the support arms (2) has a hollowed-out limiting groove (220) extending in the left-right direction. The fixed shell (1b) is provided with a mounting post (130) extending in the front-back direction. The mounting post (130) is inserted into the limiting groove (220). When the support arm (2) moves left and right, the mounting post (130) moves along the limiting groove (220). The front end of the mounting post (130) abuts against the front cover (1a). The mounting post (130) and the front cover (1a) are detachably connected by screws.

11. The segmented adjustment structure for waist panel spacing according to claim 1, characterized in that, Each side of the support arm (2) near the end of the connecting member (5) is provided with a pair of vertical guide grooves (230) symmetrically arranged vertically. The end of the connecting member (5) near the support arm (2) is provided with a locking head (530) protruding in the front-back direction. The locking head (530) is engaged with the guide groove (230) on the corresponding side. When the connecting member (5) rotates, the locking head (530) slides along the guide groove (230).

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