Lumbar support adjustment mechanism and seat

Abstract

The utility model discloses a lumbar support adjustment mechanism and a seat, the lumbar support adjustment mechanism includes a bracket, a movable seat connected to the lumbar support, a locking member and an elastic member; the movable seat is slidably mounted on the bracket so that the movable seat can move up and down relative to the bracket, and a plurality of slots arranged in the up and down directions are arranged on the bracket; the locking member includes a movable block and a lock protruding from the movable block, and the movable block and the movable seat can be movably matched to drive the lock to move laterally so that the lock is stuck in the slot or detached from the slot; the elastic member is located between the locking member and the movable seat, and is used to provide an elastic stress applied to the locking member so that the lock on the locking member always maintains a tendency to move toward the slot. The utility model only needs to move the lumbar support up and down so that the lock on the locking member is engaged with the slot at the corresponding height position to complete the height adjustment of the lumbar support, and the structure is simple, and the height of the lumbar support can be quickly and conveniently changed by directly moving the lumbar support.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a lumbar support adjustment mechanism and a seat. Background Art

[0002] Traditional seats support the user's back through the backrest, and the user's waist is suspended in the air. The waist is not supported for a long time, which is prone to back pain and has a great impact on the user's physical health. In order to overcome the above-mentioned defects of traditional seats, existing seats are usually also equipped with lumbar supports to provide support for the user's waist; the lumbar supports of some seats adopt a fixed structure, which cannot be adjusted according to the body shape and sitting posture of different users, and can only support the user's waist in a fixed position, which can hardly meet the individual needs of users; some lumbar supports are also adjustable and installed on the seat. Users can adjust the position of the lumbar support between multiple gears according to their own needs to find a better support position; in the existing multi-gear lumbar support adjustment mechanism, it is generally necessary to set an adjustment button, and then move the lumbar support by operating the adjustment button. The structure is relatively complicated, and it usually requires two hands to adjust the lumbar support, which is less convenient to use. Utility Model Content

[0003] The utility model aims to provide a lumbar support adjustment mechanism and a seat, which have simple structure and are easy to operate.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The lumbar support adjustment mechanism comprises a bracket, a movable seat connected to the lumbar support, a locking member and an elastic member;

[0006] The movable seat is slidably mounted on the bracket so that the movable seat can move up and down relative to the bracket, and the bracket is provided with a plurality of slots arranged in the up and down direction;

[0007] The locking member includes a movable block and a lock head protruding from the movable block, and the movable block and the movable seat can be movably matched to drive the lock head to move horizontally so that the lock head is locked in the slot or disengaged from the slot;

[0008] The elastic member is located between the locking member and the movable seat, and is used to provide an elastic stress applied to the locking member so that the locking head on the locking member always maintains a tendency to move toward the locking slot.

[0009] Preferably, a guide groove extending in the up-down direction is provided on the surface of the bracket facing the movable seat, the guide groove includes a first side wall and a second side wall arranged opposite to each other, the slot is formed by the first side wall being recessed in a direction away from the second side wall, the movable block is configured to be able to swing relative to the movable seat to drive the lock head to move laterally between a first position disposed in the slot and a second position located in the guide groove, and when the movable block is located in the second position, the lock head can slide in the up-down direction in the guide groove.

[0010] Preferably, the guide groove includes an upper end wall connected between the top of the first side wall and the second side wall, and a lower end wall connected between the bottom of the first side wall and the second side wall, the portion of the guide groove located between the uppermost slot and the upper end wall forms a guide section, and the guide section is used to limit the lock head from swinging relative to the movable seat when the lock head slides into it so as to limit the lock head to the second position; the movable block is configured to be able to move relative to the movable seat in the up and down directions, and a locking portion is provided on the movable seat, the upper end wall is used to push the lock head downward when the lock head moves upward to the top of the guide groove, so that the movable block combines with the locking portion to limit the movable block from swinging relative to the movable seat to limit the lock head in the second position, and the lower end wall is used to push the lock head upward when the lock head moves downward to the bottom of the guide groove, so that the movable block is disengaged from the locking portion.

[0011] Preferably, one side surface of the movable seat facing the bracket is recessed in a direction away from the bracket to form an installation groove, the installation groove includes an upper wall surface and a lower wall surface opposite to the upper wall surface, the upper wall surface is provided with an upper groove recessed upward, and the locking portion is a lower groove provided on the lower wall surface; the movable block is placed in the installation groove, and it includes a rotating end embedded in the upper groove and capable of rotating in the upper groove, and a positioning end opposite to the rotating end, the positioning end can be clamped in the lower groove as the movable block moves downward, and can be disengaged from the lower groove as the movable block moves upward.

[0012] Preferably, a cover plate is fixedly connected to the movable seat in a detachable manner and covers the opening of the installation slot, and a through hole is provided on the cover plate for the lock head to pass through.

[0013] Preferably, the slot includes a retaining wall extending from the first side wall toward a direction away from the second side wall, and a guide wall extending upwardly from a side of the retaining wall away from the second side wall to the first side wall, and the angle between the retaining wall and the extension direction of the guide slot is a, where a≥90°.

[0014] Preferably, the bracket is provided with two slide grooves extending in the up-down direction, and two protrusions are protruding on the surface of the movable seat facing the bracket, and the two protrusions are respectively slidably embedded in the two slide grooves, and the movable seat is provided with a baffle, which is detachably fixed on the two protrusions, and the baffle and the movable seat are respectively located on both sides of the bracket; the part of the bracket located between the two slide grooves forms a mounting wall, and the card slot is provided on a side surface of the mounting wall facing the movable seat.

[0015] Preferably, a wear-resistant sleeve is provided on the outer periphery of the projection, and the outer edge surface of the wear-resistant sleeve is in contact with and fits with the inner wall surface of the slide groove.

[0016] Preferably, a mounting gap is formed between a side of the mounting wall facing the baffle and the baffle, and a roller is provided in the mounting gap for rolling cooperation with the mounting wall and / or the baffle.

[0017] The seat comprises the above-mentioned lumbar support adjustment mechanism.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The lumbar support adjustment mechanism of the utility model utilizes the elastic stress provided by the elastic member to make the lock head on the locking member engage with one of the slots on the bracket. When adjusting the position of the lumbar support, it is only necessary to move the lumbar support up and down, and the movable seat drives the locking member to move up and down, so that the lock head on the locking member engages with the slot at the corresponding height position to complete the height adjustment of the lumbar support. The lumbar support adjustment mechanism is simple, and the height of the lumbar support can be quickly and conveniently changed by directly moving the lumbar support. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the middle bracket;

[0022] Figure 3 for Figure 2 Magnified view at A in the middle;

[0023] Figure 4 for Figure 1 A schematic diagram of the cooperation between the middle movable seat and the locking member;

[0024] Figure 5 for Figure 1 A schematic diagram of the structure of the middle locking member;

[0025] Figure 6a-6f It is a schematic diagram of the use state of the utility model.

[0026] Among them: 10, bracket; 11, slide groove; 12, mounting wall; 13, guide groove; 131, first side wall; 132, second side wall; 133, upper end wall; 134, lower end wall; 135, guide section; 14, slot; 141, retaining wall; 142, guide wall; 20, movable seat; 21, cover plate; 22, protrusion; 23, mounting groove; 231, upper wall surface; 232, upper groove; 233, lower wall surface; 234, lower groove; 24, baffle; 25, wear-resistant sleeve; 26, roller; 30, locking member; 31, movable block; 311, rotating end; 312, positioning end; 32, lock head; 40, spring. DETAILED DESCRIPTION

[0027] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0029] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] like Figure 1 , 2, 3, 4, and 5 show a lumbar support adjustment mechanism of the present invention, which includes a bracket 10, a movable seat 20 connected to the lumbar support, a locking member 30, and a spring 40. The bracket 10 can be a backrest bracket of a seat, and the lumbar support is connected to the movable seat 20. The movable seat 20 is slidably mounted on the bracket 10 so that the movable seat 20 can move up and down relative to the bracket 10, thereby enabling the lumbar support to have the freedom to move in the up and down directions relative to the seat back. A plurality of slots 14 sequentially arranged in the up and down directions are provided on the bracket 10. The locking member 30 is mounted on the movable seat 20, and can cooperate with the slots 14 of a predetermined height when the movable seat 20 moves to a predetermined position in the up and down directions, so as to adjust the movable seat 20 is locked with the bracket 10, wherein the locking member 30 includes a movable block 31 and a locking head 32 protruding from the movable block 31, the movable block 31 is installed on the movable seat 20, and the movable cooperation between the movable seat 20 and the movable seat 20 enables the locking head 32 to have the freedom of lateral movement, thereby enabling the locking head 32 to be clamped in one of the slots 14 to achieve the purpose of locking the movable seat 20 and the bracket 10, and enabling the locking head 32 to be disengaged from the slot 14 to achieve the purpose of adjusting the height of the movable seat 20 up and down, and the spring 40 is located between the locking member 30 and the movable seat 20, and the spring 40 is used to apply an elastic stress to the locking member 30, so that the locking head 32 on the locking member 30 always maintains a tendency to move toward the slot 14.

[0031] In a more specific embodiment, the utility model is provided with a guide groove 13 extending in the up-down direction on the surface of the bracket 10 facing the movable seat 20, the guide groove 13 includes a first side wall 131, and a second side wall 132 opposite to the first side wall 131, and the above-mentioned multiple card grooves 14 are arranged on the first side wall 131 of the guide groove 13, specifically, the card groove 14 is formed by the first side wall 131 being recessed in the direction away from the second side wall 132, and the movable block 31 can swing relative to the movable seat 20 after being installed on the movable seat 20. When the movable block 31 swings relative to the movable seat 20, the lock head 32 on the locking member 30 swings with the movable block 31, and the lock head 32 is embedded in the guide groove 13 after protruding from the movable block 31, so that the movable block 31 can drive The lock head 32 swings laterally inside the guide groove 13, that is, the lock head 32 can swing between the card slot 14 and the guide groove 13. When the lock head 32 swings to the inside of the card slot 14, the lock head 32 is combined with the card slot 14 so that the lock head 32 is located in the first position where it is stuck in the card slot 14. After the movable block 31 swings a certain amplitude in the opposite direction, the lock head 32 disengages from the card slot 14 combined with it and is located in the second position in the guide groove 13. When the lock head 32 is maintained in the second position, the movable seat 20 can move relative to the bracket 10 in the up and down direction, and the lock head 32 can slide in the up and down direction inside the guide groove 13 as the movable seat 20 moves up and down. The elastic stress provided by the spring 40 can enable the locking member 30 to always maintain a tendency to swing toward the first side wall 131.

[0032] That is to say, when the swinging freedom of the lock head 32 is not restricted, under the action of the elastic stress of the spring 40, the lock head 32 is ensured to be in the first position to engage with the slot 14; when the lock head 32 is in the second position and the swinging freedom is restricted, the elastic stress applied by the spring 40 cannot cause the lock head 32 to swing toward the first position, so as to ensure that the lock head 32 can slide inside the guide groove 13 along the up and down directions; the limitation of the swinging freedom of the lock head 32 when the lock head 32 is in the second position is achieved through the relevant structure inside the guide groove 13 and the matching structure between the movable block 31 and the movable seat 20.

[0033] Specifically, the guide groove 13 includes an upper end wall 133 connected between the top of the first side wall 131 and the second side wall 132, and a lower end wall 134 connected between the bottom of the first side wall 131 and the second side wall 132. The portion between the uppermost slot 14 in the guide groove 13 and the upper end wall 133 forms a guide section 135. The guide section 135 is used to limit the swing of the lock head 32 relative to the movable seat 20 when the lock head 32 slides into the inside thereof so that the lock head 32 remains in the second position. That is to say, when the lock head 32 slides into the inside of the guide section 135, it is guided by the guide section 135 so that the lock head 32 is in the second position, and at this time the lock head 32 does not have the freedom to move toward the first position, thereby limiting the freedom of the movable block 31 to swing relative to the movable seat 20; the guiding section 135 is formed by not setting the card slot 14 at a distance above the guide slot 13, and its width is limited by the first side wall 131 and the second side wall 132 of the guide slot 13, so that the guiding section 135 is a long strip structure, and the lock head 32 is set to a long strip structure, and its width is equivalent to the width of the guiding section 135, so that the lock head 32 can slide into the guiding section 135 from bottom to top, and the guiding section 135 can limit the freedom of the lock head 32 to swing therein, thereby achieving the purpose of limiting the lock head 32 to the second position.

[0034] The movable block 31 is configured to be movable relative to the movable seat 20 in the up and down directions, that is, the movable block 31 can both swing relative to the movable seat 20 and move up and down relative to the movable seat 20. A locking portion is provided on the movable seat 20. When the movable block 31 moves downward to a low position relative to the movable seat 20, the movable block 31 is combined with the locking portion to limit the swinging freedom of the movable block 31 relative to the movable seat 20, thereby limiting the lock head 32 in the second position. The up and down movement of the movable block 31 relative to the movable seat 20 is achieved by the upper end wall 133 and the lower end wall 134 of the guide groove 13 pushing the lock head 32.

[0035] Specifically, when the movable seat 20 drives the locking member 30 to move upward relative to the bracket 10, the lock head 32 moves upward to the top of the guide groove 13 in the guide section 135 along with the movable seat 20, and the upper end wall 133 blocks the lock head 32 from continuing to move upward, pushing the lock head 32 downward. Under the push of the upper end wall 133, the movable block 31 moves downward to a low position relative to the movable seat 20, so that the movable block 31 is combined with the locking portion on the movable seat 20. At this time, the lock head 32 remains in the second position. When the movable seat 20 drives the locking member 30 to move downward to a predetermined position relative to the bracket 10, the lock head As the movable seat 20 moves along the guide groove 13 to the bottom of the guide groove 13, the lower end wall 134 blocks the lock head 32 from continuing to move downward, and then pushes the lock head 32 upward. Under the push of the lower end wall 134, the movable block 31 moves upward to a high position relative to the movable seat 20, so that the movable block 31 is disengaged from the locking portion on the movable seat 20. At this time, the swinging freedom of the movable block 31 relative to the movable seat 20 is no longer limited by the locking portion. Under the elastic stress of the spring 40, the lock head 32 in the second position swings toward the first position, so that the lock head 32 can be inserted into the slot 14.

[0036] A mounting groove 23 is formed on one side surface of the movable seat 20 facing the bracket 10 and is recessed in a direction away from the bracket 10. The mounting groove 23 includes an upper wall 231 and a lower wall 233 opposite to the upper wall 231. An upper groove 232 recessed upward is provided on the upper wall 231. The above-mentioned locking portion is a lower groove 234 provided on the lower wall 233. The movable block 31 is embedded in the mounting groove 23, and includes a rotating end 311 located at its upper end and a positioning end 312 located at its lower end opposite to the rotating end 311. The rotating end 311 is embedded in the upper groove 232, and the rotating end 311 is configured to be able to rotate in the upper groove 232.

[0037] Specifically, one side of the rotating end 311 is set to an arc shape, so that when the rotating end 311 rotates in the upper groove 232, the rotating end 311 is prevented from interfering with the peripheral surface of the upper groove 232, so that the movable block 31 can swing relative to the movable seat 20, and the positioning end 312 can move downward with the movable block 31 relative to the movable seat 20 to be engaged in the lower groove 234, and the lower groove 234 cooperates with the positioning end 312 to limit the freedom of the movable block 31 to swing relative to the movable seat 20, so that the lock head 32 is maintained in the second position, and when the positioning end 312 moves upward with the movable block 31 relative to the movable seat 20, the positioning end 312 can disengage from the lower groove 234.

[0038] See also Figure 6a-6f As shown, the schematic diagram of the use process of the lumbar support adjustment mechanism of the utility model is shown in FIG. Figure 6aIn the state shown, the lock head 32 is in the first position and is stuck in one of the slots 14. The spring 40 pushes the locking member 30 so that the lock head 32 is stably combined with the slot 14, so that the movable seat 20 and the bracket 10 remain in a relatively fixed state. When the lumbar support needs to be adjusted upward, the lumbar support is lifted upward, and the movable seat 20 drives the locking member 30 to move upward, and the inner wall of the slot 14 is used to squeeze the lock head 32, so that the lock head 32 is disengaged from the slot 14. After the movable seat 20 is moved upward to a predetermined position, the elastic stress of the spring 40 is used to make the lock head 32 stuck in the slot 14 at a predetermined height, thereby completing the height adjustment of the lumbar support.

[0039] exist Figure 6a In the state shown, when the lumbar support is too high and needs to be adjusted downward, Figure 6b As shown, the lumbar support is moved upward, so that the movable seat 20 drives the locking member 30 to move upward, and the locking head 32 moves upward with the locking member 30 to the guiding section 135 of the guide groove 13, and the locking head 32 is guided by the guiding section 135 to keep the locking head 32 in the second position.

[0040] When the lock head 32 moves to the top of the guide groove 13 and contacts the upper end wall 133, as shown in FIG. Figure 6c As shown, the movable seat 20 drives the locking member 30 to continue to move upward, and the upper end wall 133 pushes the lock head 32 downward. The lock head 32 is kept in the second position, so that the movable block 31 moves downward inside the installation groove 23. The positioning end 312 on the movable block 31 is clamped in the lower groove 234. The lower groove 234 cooperates with the positioning end 312 to keep the lock head 32 in the second position. At this time, Figure 6d As shown, the lumbar support is moved downward, and the movable seat 20 drives the locking member 30 to move downward. Due to the limiting structure formed by the cooperation between the lower groove 234 and the positioning end 312, the locking head 32 is still maintained in the second position when it is separated from the guiding section 135.

[0041] When the movable seat 20 drives the locking member 30 to move downward until the lock head 32 contacts the lower end wall 134 of the guide groove 13, as shown in FIG. Figure 6e As shown, the movable seat 20 continues to move downward, and the lower end wall 134 pushes the lock head 32 upward, so that the movable block 31 moves upward inside the installation groove 23, and the positioning end 312 on the movable block 31 moves upward and disengages from the lower groove 234. At this time, the swing freedom of the movable block 31 is no longer limited by the lower groove 234. Figure 6fAs shown, under the elastic stress of the spring 40, the movable block 31 swings toward the first side wall 131 inside the mounting groove 23, so that the lock head 32 swings to the lowest slot 14 and combines with the slot 14. At this time, the lumbar support is in the lowest position. The lumbar support is moved upward according to the required height, and the movable seat 20 drives the locking member 30 to move upward, so that the lock head 32 is stuck in the slot 14 of the corresponding height, and the height adjustment of the lumbar support is completed.

[0042] It should be pointed out that the above-mentioned spring 40 of the utility model can be replaced by other elastic members. For example, the elastic member can be an elastic rubber block arranged between the movable seat 20 and the locking member 30, or a tension spring connected between the movable seat 20 and the locking member 30.

[0043] In the lumbar support adjustment mechanism of the present invention, the elastic stress provided by the elastic member is used to make the lock head 32 on the locking member 30 engage with one of the slots on the bracket 10. When adjusting the position of the lumbar support, it is only necessary to move the lumbar support up and down, and the movable seat 20 drives the locking member 30 to move up and down, so that the lock head 32 on the locking member 30 engages with the slot at the corresponding height position to complete the height adjustment of the lumbar support. The lumbar support adjustment mechanism is simple, and the height of the lumbar support can be quickly and conveniently changed by directly moving the lumbar support.

[0044] It should be pointed out that, in the present invention, the locking portion provided in the mounting groove 23 is not limited to the above-mentioned lower groove 234, it can also be a stopper protruding on the lower wall surface 233 of the mounting groove 23. After the movable block 31 moves downward a predetermined distance in the mounting groove 23, the stopper is used to block the positioning end 312 of the movable block 31, which can also keep the lock head 32 in the second position.

[0045] The structure in which the movable block 31 can rotate in the mounting groove 23 is not limited to the structure in which the upper groove 232 and the rotating end 311 cooperate with each other. In other embodiments, a boss with a circular cross-section protruding upward may be provided on the bottom surface of the mounting groove 23, and a long groove may be provided on the movable block 31. The boss is connected to the long groove, and the boss can slide in the long groove to meet the requirement that the movable block 31 can move inside the mounting groove 23 in the up and down directions. At the same time, the boss with a circular cross-section ensures that the movable block 31 can rotate relative to the boss.

[0046] In order to prevent the locking member 30 from detaching from the movable seat 20, a cover plate 21 is fixed to the movable seat 20 by screws or other detachable means, and the cover plate 21 covers the opening of the mounting groove 23. A through hole is provided on the cover plate 21. After the locking member 30 and the spring 40 are placed inside the mounting groove 23, the cover plate 21 is fixed to the movable seat 20 by screws so that the lock head 32 of the locking member 30 passes through the through hole on the cover plate 21. The size of the through hole should meet the lateral movement requirements of the lock head 32.

[0047] The card slot 14 of the utility model includes a retaining wall 141 and a guide wall 142, wherein the retaining wall 141 extends from the first side wall 131 in a direction away from the second side wall 132, and the guide wall 142 extends obliquely upward from a side of the retaining wall 141 away from the second side wall 132 to the first side wall 131, and the extending direction of the retaining wall 141 is perpendicular to the up-down direction, that is, the angle a between the extending direction of the retaining wall 141 and the extending direction of the guide slot 13 is 90°. When the lock head 32 is inserted into the guide slot 13, the retaining wall 141 is used to support the lower part of the lock head 32, and the supporting force applied by the retaining wall 141 to the lock head 32 is consistent with the up-down direction, so that the lock head 32 can be stably connected in the card slot 14, and the card slot 14 and the lock head 32 cooperate to provide a sufficient downward pressure value for the waist support.

[0048] In other embodiments, the angle a between the extension direction of the retaining wall 141 and the extension direction of the guide groove 13 can be greater than 90°. For example, the retaining wall 141 gradually tilts downward from the first side wall 131 toward a direction away from the second side wall 132. After the lock head 32 is engaged in the slot 14, the inclined retaining wall 141 can prevent the lock head 32 from moving toward the inside of the guide groove 13.

[0049] The guide wall 142 is set to an inclined structure, and when the lock head 32 moves upward, the guide wall 142 can be used to push the lock head 32 to push the lock head 32 into the guide groove 13, for example Figure 6a In the state shown, the lumbar support is moved upward, and the locking member 30 moves upward with the movable seat 20 relative to the bracket 10. The lock head 32 is squeezed by the guide wall 142 of the slot 14, so that the lock head 32 can be disengaged from the slot 14 and slide into the guide slot 13. Then, when the lumbar support is moved upward, the lock head 32 can be disengaged from the lower slot 14, and according to the elastic stress of the spring 40, the lock head 32 can be snapped into the upper slot 14, so that the height adjustment of the lumbar support can be achieved quickly and conveniently.

[0050] In another preferred embodiment, the utility model is provided with two slide grooves 11 extending in the up-down direction on the bracket 10, and two protrusions 22 are provided on the surface of the movable seat 20 facing the bracket 10, and the width of the protrusion 22 is equivalent to the width of the slide groove 11. The two protrusions 22 are respectively slidably embedded in the two slide grooves 11, and the protrusions 22 and the slide groove 11 cooperate with each other to form a linear guide pair between the movable seat 20 and the bracket 10; a baffle 24 is provided on the movable seat 20, and the baffle 24 is fixed on the two protrusions 22 by screws or other detachable methods, and the baffle 24 and the movable seat 20 are respectively arranged on both sides of the bracket 10 to facilitate the assembly of the movable seat 20 and the bracket 10. The part of the bracket 10 located between the two slide grooves 11 forms a mounting wall 12, and the above-mentioned multiple card slots 14 are arranged on a side surface of the mounting wall 12 facing the movable seat 20, and the guide groove 13 is also arranged on a side surface of the mounting wall 12 facing the movable seat 20.

[0051] During assembly, the locking member 30 and the spring 40 are placed in the mounting groove 23 of the movable seat 20, and the opening of the mounting groove 23 is covered with the cover plate 21. Then, the movable seat 20 and the baffle plate 24 are respectively placed on both sides of the mounting wall 12 of the bracket 10, so that the protrusion 22 is embedded in the slide groove 11, and the lock head 32 is inserted into one of the slots 14. Finally, the baffle plate 24 is fixed to the movable seat 20 with screws.

[0052] A wear-resistant sleeve 25 is also sleeved on the periphery of the protrusion 22. The outer edge surface of the wear-resistant sleeve 25 contacts and cooperates with the inner wall surface of the slide groove 11. The wear-resistant sleeve 25 is made of a material different from that of the protrusion 22. For example, the wear-resistant sleeve 25 can be made of polyoxymethylene (POM), which has better surface smoothness and wear resistance, so that the linear guide rail pair composed of the protrusion 22 and the slide groove 11 has a longer service life and ensures that the movable seat 20 can slide smoothly. When the movable seat 20 is worn out after a long period of use and does not slide smoothly, a new wear-resistant sleeve 25 can be replaced. A mounting gap is formed between the side of the mounting wall 12 facing the baffle 24 and the baffle 24. A roller 26 is arranged in the mounting gap. The roller 26 rolls with the mounting wall 12 and the baffle 24 to reduce the friction between the mounting wall 12 and the bracket 10, and further ensure that the movable seat 20 can slide smoothly relative to the bracket 10 in the up and down directions. The roller 26 can also be made of the above-mentioned polyoxymethylene (POM).

[0053] The seat of the utility model includes the above-mentioned lumbar support adjustment mechanism, and other structures of the seat are the same as those in the prior art, which will not be described in detail here.

[0054] Finally, it should be noted that the above-mentioned implementation modes are only optional embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. Lumbar support adjustment mechanism, characterized in that: It includes a bracket, a movable seat connected with the waist support, a locking piece and an elastic piece; The movable seat is slidably mounted on the bracket so that the movable seat can move up and down relative to the bracket, and the bracket is provided with a plurality of slots arranged in the up and down direction; The locking member includes a movable block and a lock head protruding from the movable block, and the movable block and the movable seat can be movably matched to drive the lock head to move horizontally so that the lock head is locked in the slot or disengaged from the slot; The elastic member is located between the locking member and the movable seat, and is used to provide an elastic stress applied to the locking member so that the locking head on the locking member always maintains a tendency to move toward the card slot.

2. The lumbar support adjustment mechanism according to claim 1, characterized in that: A guide groove extending in the up-down direction is arranged on the surface of the bracket facing the movable seat, the guide groove includes a first side wall and a second side wall arranged opposite to each other, the locking groove is recessed by the first side wall in a direction away from the second side wall, the movable block is configured to be able to swing relative to the movable seat to drive the lock head to move laterally between a first position clamped in the locking groove and a second position located in the guide groove, and when the movable block is located in the second position, the lock head can slide in the guide groove in the up-down direction.

3. The lumbar support adjustment mechanism according to claim 2, characterized in that: The guide groove includes an upper end wall connected between the top of the first side wall and the second side wall, and a lower end wall connected between the bottom of the first side wall and the second side wall. The portion of the guide groove located between the uppermost slot and the upper end wall forms a guide section, which is used to limit the lock head from swinging relative to the movable seat when the lock head slides into it so as to limit the lock head to the second position; the movable block is configured to be able to move relative to the movable seat in the up and down directions, and a locking portion is provided on the movable seat, the upper end wall is used to push the lock head downward when the lock head moves upward to the top of the guide groove, so that the movable block combines with the locking portion to limit the movable block from swinging relative to the movable seat to be limited in the second position, and the lower end wall is used to push the lock head upward when the lock head moves downward to the bottom of the guide groove, so that the movable block is disengaged from the locking portion.

4. The lumbar support adjustment mechanism according to claim 3, characterized in that: One side surface of the movable seat facing the bracket is recessed in a direction away from the bracket to form an installation groove, the installation groove includes an upper wall surface and a lower wall surface opposite to the upper wall surface, the upper wall surface is provided with an upper groove recessed upward, and the locking portion is a lower groove provided on the lower wall surface; the movable block is placed in the installation groove, and it includes a rotating end embedded in the upper groove and capable of rotating in the upper groove, and a positioning end opposite to the rotating end, the positioning end can be clamped in the lower groove as the movable block moves downward, and can be disengaged from the lower groove as the movable block moves upward.

5. The lumbar support adjustment mechanism according to claim 4, characterized in that: A cover plate which covers the opening of the installation slot is fixedly connected to the movable seat in a detachable manner, and a through hole for the lock head to pass through is arranged on the cover plate.

6. The lumbar support adjustment mechanism according to claim 2, characterized in that: The card slot includes a blocking wall extending from the first side wall toward a direction away from the second side wall, and a guide wall extending upwardly from a side of the blocking wall away from the second side wall to the first side wall, and the angle between the blocking wall and the extension direction of the guide slot is a, where a≥90°.

7. The lumbar support adjustment mechanism according to claim 1, characterized in that: The bracket is provided with two slide grooves extending in the up-and-down directions, and two protrusions are protruding on the surface of the movable seat facing the bracket. The two protrusions are respectively slidably embedded in the two slide grooves, and the movable seat is provided with a baffle, which is detachably fixed on the two protrusions, and the baffle and the movable seat are respectively located on both sides of the bracket; the part of the bracket located between the two slide grooves forms a mounting wall, and the card slot is arranged on a side surface of the mounting wall facing the movable seat.

8. The lumbar support adjustment mechanism according to claim 7, characterized in that: The outer sleeve of the protrusion is provided with a wear-resistant sleeve, and the outer edge surface of the wear-resistant sleeve is in contact with the inner wall surface of the sliding groove.

9. The lumbar support adjustment mechanism according to claim 7, characterized in that: A mounting gap is formed between a side of the mounting wall facing the baffle and the baffle, and a roller is arranged in the mounting gap to roll with the mounting wall and the baffle.

10. A seat, characterized in that: It comprises the lumbar support adjustment mechanism described in any one of claims 1 to 9.

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