Waist support assembly of seat and seat

Abstract

The utility model discloses a waist support assembly of a seat and the seat. The waist support assembly of the seat comprises a bracket, a first movable seat, a second movable seat, a waist support and an elastic piece, the first movable seat is mounted on the bracket in a manner of being adjustable in the up-down direction, and the second movable seat is mounted on the first movable seat in a manner of being adjustable in the front-back direction; the waist support is provided with a connecting seat, the connecting seat is pivoted to the second movable seat through a rotating shaft extending in the left-right direction, the elastic piece is arranged between the connecting seat and the second movable seat, the elastic piece and the central axis of the rotating shaft are staggered by a certain distance in the up-down direction, and the elastic piece is used for providing elastic stress applied to the connecting seat. According to the waist support assembly, the waist support can be adjusted to a proper position in the up-down direction and the front-back direction, and the waist support can rotate backwards to a proper angle in a self-adaptive mode after being squeezed by the waist of a user, so that the waist support assembly can meet the requirements of different body types and different sitting postures of the user, and better support is provided for the waist of the user.

Description

Technical Field

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

[0002] Traditional chairs support the user's back through the backrest. Due to the angle between the backrest and the seat cushion, the user's waist is suspended in the air, which can easily lead to waist fatigue if the waist is suspended for a long time. In order to overcome the above defects, existing chairs usually have lumbar supports at the junction of the backrest and the seat cushion to support the user's waist and prevent the waist from being suspended in the air. However, different users have different body shapes and usually change their sitting posture when using the chair. The lumbar supports of existing chairs are difficult to meet the needs of users with different body shapes and different sitting postures. Utility Model Content

[0003] The utility model aims to provide a lumbar support assembly for a chair and a chair, which can meet the needs of different body shapes and different sitting postures and provide better support for the waist of the user.

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

[0005] A lumbar support assembly of a seat, comprising a bracket, a first movable seat, a second movable seat, a lumbar support, and an elastic member;

[0006] The first movable seat is mounted on the bracket in a manner that it can be adjusted in the up-down direction, and the second movable seat is mounted on the first movable seat in a manner that it can be adjusted in the front-back direction;

[0007] A connecting seat is arranged on the waist support, and the connecting seat is pivotally connected to the second movable seat through a rotating shaft extending in the left-right direction. The elastic member is arranged between the connecting seat and the second movable seat and is staggered with the central axis of the rotating shaft by a certain distance in the vertical direction to provide an elastic stress applied to the connecting seat.

[0008] Preferably, a retaining wall is respectively provided on both sides of the connecting seat, the second movable seat is confined between the two retaining walls, and the rotating shaft crosses the two retaining walls and the second movable seat to pivotally connect the connecting seat to the second movable seat; a limiting groove is provided on one side of the second movable seat, and a limiting block embedded in the limiting groove is provided on the retaining wall, and the limiting block swings between the top surface and the bottom surface of the limiting groove to limit the swinging amplitude of the connecting seat relative to the second movable seat.

[0009] Preferably, a groove recessed away from the connecting seat is provided on the end surface of the second movable seat facing the connecting seat, the elastic member is a spring embedded in the groove, one end of the spring abuts against the bottom surface of the groove, and the other end abuts against the connecting seat, and a first axial hole located below the groove is provided at one end of the second movable seat close to the connecting seat, a second axial hole is provided on the retaining wall, and the rotating shaft is a locking screw that crosses the first axial hole and the second axial holes of the two retaining walls.

[0010] Preferably, the second movable seat is provided with a plurality of first slots arranged in the front-to-back direction, the first movable seat is provided with a first locking member and a first spring, the first locking member includes a locking column matching the first slot, the first locking member is movably mounted on the first movable seat so that the locking column can move in the left-right direction between a position embedded in the first slot and a position disengaged from the first slot, and the first spring is used to provide an elastic stress applied to the first locking member so that the locking column always maintains a tendency to move toward the first slot.

[0011] Preferably, a guide groove extending in the front-to-back direction is provided on the second movable seat, the guide groove comprising a first side wall, a second side wall opposite to the first side wall, a first end connected between the rear ends of the first side wall and the second side wall, and a second end connected between the front ends of the first side wall and the second side wall, the first clamping groove is formed by the first side wall being recessed in a direction away from the second side wall, and a portion of the guide groove between the first clamping groove and the first end located at the rear side forms a guide section; the first locking member is configured to be able to move relative to the first movable seat in the front-to-back direction, and to swing relative to the first movable seat in the left-to-right direction; the locking of the first locking member The column can slide along the guide groove, and the guide section is used to limit the locking column when the locking column slides into it so that the locking column is kept in a position away from the first slot; a locking portion is provided on the first movable seat, and the first end of the guide groove is used to push the locking column to make the first locking member move forward relative to the first movable seat, so as to combine the first locking member with the locking portion to keep the locking column in a position away from the first slot, and the second end of the guide groove is used to push the locking column to make the locking column move backward relative to the first movable seat, driving the locking member to disengage from the locking portion, so that the elastic stress of the first spring can push the first locking member to drive the locking column to be in a position embedded in the first slot.

[0012] Preferably, a mounting groove is provided on the first movable seat, the mounting groove includes a rear end face and a front end face opposite to the rear end face, a rear groove recessed backward is provided on the rear end face, and the locking portion is a front groove recessed forward from the front end face; the first locking member includes a rotating end and a locking end opposite to the rotating end, the rotating end is embedded in the rear groove and can rotate in the rear groove, the locking end can be clamped in or disengaged from the front groove as the first locking member moves forward and backward relative to the first movable seat, and when the locking end is clamped in the front groove, the locking column is at a position away from the first clamping groove. The first clamping groove includes a supporting wall extending from the first side wall in a direction away from the second side wall, and a guide wall extending obliquely from a side of the supporting wall away from the second side wall to the first side wall.

[0013] Preferably, a guide slot extending in the front-to-back direction is provided on the first movable seat, and the second movable seat is slidably connected in the guide slot; the mounting slot is formed by an upward depression in the bottom surface of the first movable seat, and a bottom cover covering the mounting slot opening is fixed under the first movable seat; a guide groove extending in the front-to-back direction is provided on the bottom surface of the second movable seat, and a guide column slidably embedded in the guide groove is provided on the bottom cover, and a convex rib matching the guide column is provided at the rear of the guide groove.

[0014] Preferably, the bracket is provided with a sliding groove extending in the up-down direction, the sliding groove includes a first side and a second side opposite to the first side, and the first movable seat is provided with a sliding block slidably embedded in the sliding groove; a plurality of second clamping grooves arranged in the up-down direction are provided on the first side of the sliding groove; a second locking member and a second spring are installed on the slider, and a locking boss is provided on the second locking member, and the second locking member and the slider are movably matched so that the locking boss can move between a position clamped in the second clamping slot and a position disengaged from the second clamping slot; the second spring is used to provide an elastic stress applied to the second locking member so that the second locking member always maintains a tendency to move toward the second clamping slot.

[0015] Preferably, a shaft head is provided on the second locking member, and a long groove extending in the up-down direction is provided on the slider, and the shaft head is embedded in the long groove so that the second locking member can move in the up-down direction relative to the slider and swing in the left-right direction relative to the slider; the second locking member is also provided with a lever and a locking boss, and the lever and the locking boss are respectively located on both sides of an end of the second locking member away from the shaft head, and a limiting boss cooperating with the locking boss is provided on the slider; when the shaft head moves in the up-down direction to the lower end of the long groove, the limiting boss combines with the locking boss to limit the second locking member to move toward the second locking boss The freedom of the slot to swing; a limiting groove is arranged on the second side of the sliding slot, the upper end surface of the limiting groove forms a first limiting surface, and the lower end surface forms a second limiting surface, the first limiting surface is used to push the lever downward so that the second locking piece moves downward along the long slot and the locking boss is combined with the limiting boss; the second limiting surface is used to push the lever upward so that the second locking piece moves upward along the long slot and the locking boss is disengaged from the limiting boss; the second slot includes a supporting surface extending from the first side edge toward the side away from the second side edge, and an inclined surface extending from the side of the supporting surface away from the second side edge to the first side edge.

[0016] A seat, comprising the above-mentioned lumbar support assembly of the seat.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] In the utility model, the first movable seat is installed on the bracket in an adjustable manner up and down, and the second movable seat is installed on the first movable seat in an adjustable manner forward and backward, so that the lumbar support has adjustable freedom in the up and down directions and the forward and backward directions, and the rotatable cooperation between the connecting seat and the second movable seat enables the lumbar support to have the freedom to swing backwards, and the elastic member between the second movable seat and the connecting seat is used as a supporting member to provide elastic support for the lumbar support so that the lumbar support can swing forward and backward. When using the seat, the lumbar support can be adjusted to an appropriate position in the up and down directions and the forward and backward directions, and after being squeezed by the user's waist, the lumbar support can adaptively rotate backwards to an appropriate angle until the squeezing force of the waist on the lumbar support is balanced with the elastic stress of the elastic member. In this way, the lumbar support assembly can meet the needs of users with different body shapes and different sitting postures, and provide better support for the user's waist. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of the middle connecting seat;

[0022] Figure 4It is a schematic diagram of the cooperation between the first movable seat and the second movable seat in the figure;

[0023] Figure 5 for Figure 4 A schematic diagram of the structure of the second movable seat;

[0024] Figure 6 for Figure 1 A schematic diagram of a state of the first locking member and the first movable seat;

[0025] Figure 7 for Figure 1 A schematic diagram of another state of the first locking member and the first movable seat;

[0026] Figure 8-10 This is a schematic diagram of a usage state of the utility model;

[0027] Fig.11 for Figure 1 Schematic diagram of the cooperation between the middle slider and the mounting seat;

[0028] Fig.12 for Fig.11 Schematic diagram of the structure of the middle slide;

[0029] Figure 13-15 This is another schematic diagram of the utility model in use state.

[0030] Among them: 10, bracket; 11, mounting seat; 12, sliding groove; 121, first side; 122, second side; 13, limiting groove; 131, first limiting surface; 132, second limiting surface; 14, second slot; 141, supporting surface; 142, inclined surface; 20, waist support; 21, connecting seat; 211, retaining wall; 212, limiting block; 213, second shaft hole; 22, rotating shaft; 30, first movable seat; 31, mounting groove; 311, rear end surface; 312, rear groove; 313, front end surface; 314, front groove; 32, guide slide groove; 33, bottom cover; 40, second movable seat; 41, guide groove; 411, first side wall; 41 2. second side wall; 413. first end; 414. second end; 415. guiding section; 42. first slot; 421. supporting wall; 422. guide wall; 43. groove; 44. limiting groove; 45. guide groove; 451. convex rib; 46. first axial hole; 50. spring; 60. first locking member; 61. first spring; 62. rotating end; 63. locking end; 64. locking column; 70. slider; 71. second locking member; 711. locking boss; 712. shaft head; 713. lever; 714. locking boss; 72. slide seat; 721. recess; 722. long groove; 723. limiting boss; 73. cover plate; 74. second spring. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] like Figure 1-Figure 4As shown, a lumbar support assembly of a seat of the utility model comprises a bracket 10, a first movable seat 30, a second movable seat 40, a lumbar support 20, and a spring 50. The first movable seat 30 is movably mounted on the bracket 10 in the up-down direction, and can be relatively fixed with the bracket 10 after being moved to a predetermined position, that is, the first movable seat 30 is mounted on the bracket 10 in a manner that can be adjusted in the up-down direction; the second movable seat 40 is movably mounted on the first movable seat 30 in the front-to-back direction, and can be relatively fixed with the first movable seat 30 after being moved to a predetermined position, that is, the second movable seat 40 is mounted on the first movable seat 30 in a manner that can be adjusted in the front-to-back direction; a connecting seat 21 is provided on the lumbar support 20, and the connecting seat 21 is pivotally connected to the second movable seat 40 through a rotating shaft 22, and the rotating shaft 22 The extending direction is consistent with the left-right direction in the figure. The connecting seat 21 is pivotally connected to the second movable seat 40 through the rotating shaft 22, so that the connecting seat 21 can swing forward and backward relative to the second movable seat 40. The spring 50 is installed between the second movable seat 40 and the connecting seat 21, one end of which abuts on the second movable seat 40 and the other end abuts on the connecting seat 21, thereby providing an elastic stress applied to the connecting seat 21 in the front-to-back direction. The spring 50 is staggered at a certain distance from the central axis of the rotating shaft 22 in the up and down directions, so that the elastic stress applied by the spring 50 on the connecting seat 21 has sufficient force arm, so that when the connecting seat 21 swings backward relative to the second movable seat 40, the elastic stress generated by the extrusion of the spring 50 can provide support for the connecting seat 21. The larger the deformation of the spring 50, the greater the supporting force it provides to the connecting seat 21.

[0035] In the present invention, the first movable seat 30 is installed on the bracket 10 in an adjustable manner up and down, and the second movable seat 40 is installed on the first movable seat 30 in an adjustable manner forward and backward, so that the lumbar support 20 has adjustable freedom in the up and down directions and the front and back directions, and the rotatable cooperation between the connecting seat 21 and the second movable seat 40 enables the lumbar support 20 to have the freedom to swing backward, and the spring between the second movable seat 40 and the connecting seat 21 is used as a supporting member to provide elastic support for the lumbar support 20, so that the lumbar support 20 can swing forward and backward. When using the seat, the lumbar support 20 can be adjusted to an appropriate position in the up and down directions and the front and back directions, and the lumbar support 20 can adaptively rotate backward to an appropriate angle after being squeezed by the user's waist until the squeezing force of the waist on the lumbar support 20 is balanced with the elastic stress of the spring 50, so that the lumbar support assembly can meet the needs of users with different body shapes and different sitting postures, and provide better support for the user's waist.

[0036] A retaining wall 211 is provided on both sides of the connecting seat 21, and the front end of the second movable seat 40 is limited between the two retaining walls 211. The rotating shaft 22 crosses the two retaining walls 211 and the second movable seat 40, and the connecting seat 21 is pivoted to the front end of the second movable seat 40. A limiting groove 44 is provided on one side of the second movable seat 40, and a limiting block 212 embedded in the limiting groove 44 is provided on the retaining wall 211. The limiting block 212 swings between the top surface and the bottom surface of the limiting groove 44 to limit the swing amplitude of the connecting seat 21 relative to the second movable seat 40, and prevents the connecting seat 21 from swinging too much relative to the second movable seat 40. A limiting groove 44 can be provided on both sides of the second movable seat 40, and a corresponding limiting block 212 is provided on the two retaining walls 211, and the two limiting blocks 212 are respectively embedded in the two limiting grooves 44. The end surface of the second movable seat 40 facing the connecting seat 21 is provided with a groove 43 which is recessed away from the connecting seat 21. The spring is embedded in the groove 43, one end of which abuts against the bottom surface of the groove 43 and the other end abuts against the connecting seat 21. The end of the second movable seat 40 close to the connecting seat 21 is provided with a first shaft hole 46 located below the groove 43, and the retaining wall 211 is provided with a second shaft hole 213. The rotating shaft 22 is a locking screw that crosses the first shaft hole 46 and the two second shaft holes 213. The second movable seat 40 is fixed to the second movable seat 21 by the locking screw. The seat 40 is assembled with the connecting seat 21, and the axis of rotation of the connecting seat 21 relative to the second movable seat 40 is located below the spring 50, so that the spring 50 is offset from the central axis of the rotating shaft 22; in other embodiments, the spring 50 can be replaced by other elastic members, for example, the elastic member can be an elastic rubber block embedded in the groove 43, or the rotating shaft 22 can be arranged above the elastic member, and the elastic member is a tension spring, and the two ends of the tension spring are respectively hung on the second movable seat 40 and the connecting seat 21.

[0037] See also Figure 4-Figure 10As shown, a plurality of first slots 42 arranged in the front-to-back direction are provided on the second movable seat 40, a first locking member 60 and a first spring 61 are provided on the first movable seat 30, the first locking member 60 includes a locking column 64 matched with the first slot 42, the first locking member 60 is movably mounted on the first movable seat 30, so that the locking column 64 on the first locking member 60 can swing in the left-right direction, and the locking column 64 can move between a position embedded in the first slot 42 and a position detached from the first slot 42 when swinging in the left-right direction, and the first spring 61 is used to provide an elastic stress applied to the first locking member 60 so that the locking column 64 on the first locking member 60 The locking column 64 always maintains a tendency to move toward the first slot 42, that is, when the locking column 64 is capable of swinging left and right, the locking column 64 is stuck in the first slot 42 through the elastic stress applied by the first spring 61, and the first locking member 60 is used to lock the freedom of the second movable seat 40 to move forward and backward relative to the first movable seat 30, so that the second movable seat 40 and the first movable seat 30 remain relatively fixed. When it is necessary to adjust the front and rear position of the lumbar support 20, the locking column 64 of the first locking member 60 is disengaged from the first slot 42, and the second movable seat 40 is moved in the front and rear direction, so that the locking column 64 is re-slotted into the first slot 42 at the corresponding position. In order to facilitate the adjustment of the front and rear positions of the waist support 20, the utility model provides a guide groove 41 extending in the front and rear direction on the second movable seat 40, the guide groove 41 includes a first side wall 411, a second side wall 412 opposite to the first side wall 411, a first end 413 connected between the rear ends of the first side wall 411 and the second side wall 412, and a second end 414 connected between the front ends of the first side wall 411 and the second side wall 412. The first clamping groove 42 is formed by the first side wall 411 being recessed in the direction away from the second side wall 412, and a portion of the guide groove 41 between the first clamping groove 42 and the first end 413 located at the rear side forms a guiding section 415; after the first locking member 60 is installed on the first movable seat 30, it can move in a smaller range relative to the first movable seat 30 in the front and rear direction, and can also When the second movable seat 40 moves in the front-rear direction relative to the first movable seat 30, the locking column 64 on the first locking member 60 can slide along the guide groove 41 with the first movable seat 30. The shape of the locking column 64 matches the shape of the guide section 415. When the locking column 64 slides in the guide groove 41 to the inside of the guide section 415, the guide section 415 can limit the locking column 64 so that the locking column 64 cannot rotate inside the guide section 415, and then the locking column 64 is kept in a position away from the first slot 42 in the left-right direction. A locking portion is provided on the first movable seat 30. The first end 413 and the second end 414 of the guide groove 41 are respectively used to push the locking column 64 when the locking column 64 approaches it.The first locking member 60 is made to move in the corresponding direction. Specifically, when the locking column 64 is located inside the guiding section 415 and the second movable seat 40 moves forward, the first end 413 of the guide groove 41 will push the locking column 64 forward, pushing the first locking member 60 to move forward relative to the first movable seat 30. When the first locking member 60 moves forward a small distance relative to the first movable seat 30, the first locking member 60 is combined with the locking portion on the first movable seat 30. When the first locking member 60 is combined with the locking portion, the freedom of the first locking member 60 to swing left and right relative to the first movable seat 30 is limited, and the locking column 64 is maintained at a position away from the first slot 42 in the left and right directions. In this way, the locking column 64 can be kept away from the first slot 42. The locking column 64 is hindered from sliding inside the guide groove 41. When the second movable seat 40 moves backward relative to the first movable seat 30 until the locking column 64 contacts the second end 414 of the guide groove 41, the second end 414 pushes the locking column 64 backward. After the locking column 64 moves a small distance backward relative to the first movable seat 30, the first locking member 60 is disengaged from the locking portion on the first movable seat 30. At this time, the freedom of the first locking member 60 to swing relative to the first movable seat 30 in the left and right directions will no longer be restricted by the locking portion. The elastic stress provided by the first spring 61 will push the first locking member 60, causing the first locking member 60 to swing toward the first card slot 42, and then the locking column 64 can be embedded in one of the first card slots 42. The first movable seat 30 is provided with a mounting groove 31, the mounting groove 31 includes a rear end face 311 and a front end face 313 opposite to the rear end face 311, the rear end face 311 is provided with a rear groove 312 recessed backwards, the locking portion is a front groove 314 recessed forwards from the front end face 313, the first locking member 60 includes a rotating end 62 and a locking end 63 opposite to the rotating end 62, the rotating end 62 is embedded in the rear groove 312, and the shape of the rotating end 62 is set to be fan-shaped so that it can be embedded in the rear groove 312. The first locking member 60 rotates in the rear groove 312, and then the first locking member 60 has the freedom to swing in the left-right direction relative to the first movable seat 30, and the locking end 63 can move forward and backward with the first locking member 60 relative to the first movable seat 30, so that the locking end 63 can be stuck in the front groove 314 or disengaged from the front groove 314. When the locking end 63 is stuck in the front groove 314, the first locking member 60 is located at a side of the second side wall 412 close to the guide groove 41, that is, the locking column 64 is at a position away from the first slot 42. The first slot 42 includes a support wall 421 and a guide wall 422. The support wall 421 extends from the first side wall 411 in a direction away from the second side wall 412, and the guide wall 422 extends obliquely from the side of the support wall 421 away from the second side wall 412 to the first side wall 411, and the first slot 42 is surrounded by the support wall 421 and the guide wall 422 to form a triangular structure. When the locking column 64 is located inside the first slot 42, the locking column 64 abuts against the supporting wall 421.The locking column 64 can support the backward pressure from the second movable seat 40, and transmit the backward pressure to the first movable seat 30 through the first locking member 60. When the second movable seat 40 is subjected to a forward external force, the second movable seat 40 moves forward relative to the first movable seat 30, and the guide wall 422 presses the locking column 64 in the left and right directions while moving forward, so that the locking column 64 can be disengaged from the first slot 42.

[0038] See also Figure 6-Figure 10 As shown, when adjusting the front and rear position of the waist support 20, as shown in Figure 8 As shown, the lumbar support 20 can be pulled forward first, and the second movable seat 40 moves forward to the limit position, so that the locking column 64 of the first locking member 60 slides into the guiding section 415 of the guide groove 41, and the first end 413 of the guide groove 41 pushes the locking column 64 forward, and the first locking member 60 is in Figure 6 In the state shown in FIG. 1 , the locking end 63 of the first locking member 60 is engaged with the front groove 314. At this time, the locking column 64 is located away from the first locking groove 42 in the left-right direction. Figure 8 As shown, the lumbar support 20 is pushed backward, and the second movable seat 40 moves backward, so that the second end 414 of the guide groove 41 contacts the locking column 64 and pushes the locking column 64 backward. The locking column 64 moves backward relative to the first movable seat 30, so that the locking end 63 of the first locking member 60 is disengaged from the front groove 314. At this time, the freedom of the first locking member 60 to swing left and right is no longer restricted. Under the elastic stress of the first spring 61, the first locking member 60 is in Figure 7 In the state shown, the locking column 64 is locked in the first locking groove 42 located at the front end; see Fig.10 As shown, the lumbar support 20 can be pulled forward a proper distance to allow the locking column 64 to be locked into the first locking slot 42 at the corresponding position.

[0039] A guide slot 32 extending in the front-to-back direction is also provided on the first movable seat 30, and the second movable seat 40 is slidably embedded in the guide slot 32; the above-mentioned mounting slot 31 is formed by the bottom surface of the first movable seat 30 being recessed upward, and a bottom cover 33 is fixed below the first movable seat 30, and the bottom cover 33 covers the opening of the mounting slot 31. The bottom cover 33 can be detachably fixed to the first movable seat 30 by screws, and is used to prevent the first locking member 60 and the first spring 61 from detaching from the first movable seat 30, and facilitate the first locking member 60 and the first spring 61 to be installed on the first movable seat The second movable seat 40 is on the movable seat 30; a guide groove 45 is arranged on the bottom surface of the second movable seat 40, and a guide column slidably embedded in the guide groove 45 is arranged on the bottom cover 33. A convex rib 451 matching the guide column is arranged at the rear part of the guide groove 45. When the second movable seat 40 moves forward and backward relative to the first movable seat 30, the guide column contacts the convex rib 451, providing a certain damping for the forward and backward movement of the second movable seat 40, thereby reminding the user that the lumbar support 20 is about to reach the limit position of the forward adjustment, preventing the force used to pull the lumbar support 20 forward from being too large, causing damage to the entire lumbar support assembly.

[0040] like Figure 1-Figure 2 , Figure 11-13 As shown, the bracket 10 of the present invention is provided with a sliding groove 12 extending in the up-down direction, and the first movable seat 30 is provided with a slider 70 slidably embedded in the sliding groove. The sliding groove 12 can be directly provided on the bracket 10, or it can be as shown in FIG. Figure 1 As shown, a mounting seat 11 is fixedly connected to the front side of the bracket 10 by screws, and a sliding groove 12 is set on the mounting seat 11. The slider 70 can be integrally formed and set on the rear side of the first movable seat 30, or it can be as shown in FIG. Fig.11As shown, it includes a slide seat 72 and a cover plate 73. The slide seat 72 is fixed to the rear side of the first movable seat 30 by screws or clamping, and the cover plate 73 is connected to the slide seat 72 by screws to form an assembly; a plurality of second clamping grooves 14 arranged in the up-down direction are provided on one side of the slide groove 12, and a second locking member 71 and a second spring 74 are installed on the slide block 70. The second locking member 71 and the second spring 74 are arranged between the slide seat 72 and the cover plate 73 to prevent the two from detaching from the slide block 70; the second locking member 71 and the second spring 74 are arranged between the slide seat 72 and the cover plate 73 to prevent the two from detaching from the slide block 70; The member 71 is provided with a locking boss 711. The second locking member 71 and the slider 70 can be movably matched, so that the locking boss 711 has a degree of freedom to move in the left and right directions, and then the locking boss 711 can move between a position where it is locked in one of the second slots 14 and a position where it is separated from the second slot 14. When the locking boss 711 is located in one of the second slots 14, the slider 70 and the mounting seat 11 are locked by the second locking member 71, and then the first movable seat 30 and the bracket 10 are locked. The second spring 74 is used to provide an elastic stress applied to the second locking member 71, and the second locking member 71 is always pushed toward the side of the sliding groove 12 where the second slot 14 is set by the elastic stress, so that the locking boss 711 on the second locking member 71 can be locked in one of the second slots 14. When the up and down position of the lumbar support 20 needs to be adjusted, the second locking member 71 is moved in a direction away from the second slot 14, so that the slider 70 moves along the sliding slot 12 in the up and down direction, and the positioning boss 711 is inserted into the second slot 14 at the corresponding position, thereby locking the first movable seat 30 and the bracket 10.

[0041] The second locking member 71 is configured to be able to swing left and right relative to the slider 70 and to move up and down relative to the slider 70. Specifically, a shaft head 712 is provided on the second locking member 71, and a long slot 722 extending in the up-down direction is provided on the slide seat 72 of the slider 70. The shaft head 712 is embedded in the long slot 722. The cross section of the shaft head 712 is circular, so that the shaft head 712 can rotate in the long slot 722 and slide along the long slot 722 in the up-down direction, thereby enabling the second locking member 71 to swing left and right relative to the slider 70, and to move up and down relative to the slider 70. When the second locking member 71 is in the state of being moved forward, the locking member 71 will be in the state of being moved forward, and the locking member 71 will be in the state of being moved backward. When the second locking member 71 is disengaged from the second locking groove 14, the freedom of the second locking member 71 to swing toward the second slot 14 is no longer limited. The elastic stress provided by the second spring 74 can be used to push the second locking member 71 so that the second locking member 71 swings to a position close to the second slot 14, and the locking boss 711 is embedded in the second slot 14. The up and down movement of the second locking member 71 relative to the slider 70 is achieved by the corresponding structure on the sliding groove 12, wherein the plurality of second slots 14 are located on the first side 121 of the sliding groove 12, the sliding groove 12 includes a second side 122 opposite to the first side 121, and a limiting groove 13 is provided on the second side 122. The limiting groove 13 extends a certain length in the up and down directions, and its upper end surface forms a first limiting surface 131 and the lower end surface forms a second limiting surface 132. The lever 713 is embedded in the limiting groove 13. The first limiting surface 131 is used to push the lever 713 downward so that the second locking member 71 can move downward along the long groove 722, and then the locking boss 714 on the second locking member 71 moves downward and then combines with the limiting boss 723. The second limiting surface 132 is used to push the lever 713 upward so that the second locking member 71 can move upward along the long groove 722, and then the locking boss 714 on the second locking member 71 moves upward and then disengages from the limiting boss 723.The second slot 14 includes a supporting surface 141 extending from the first side 121 of the sliding slot 12 toward the second side 122 away from the second side 122, and an inclined surface 142 extending from the side of the supporting surface 141 away from the second side 122 to the first side 121. When the locking boss 711 is locked in the second slot 14, the supporting surface 141 is supported below the locking boss 711, limiting the freedom of the second locking member 71 to move downward, and then limiting the freedom of the first movable seat 30 to move downward. When the first movable seat 30 is subjected to an upward external force, the second locking member 71 moves upward accordingly. At this time, the inclined surface 142 can push the locking boss 711, and then when the second locking member 71 moves upward, the locking boss 711 is pushed out of the second slot 14.

[0042] See also Figure 13-Figure 15 When the locking cam 711 is in the state of being disengaged from the second locking groove 14, the locking cam 713 is pressed downwardly by the first locking surface 131 and the locking cam 723 is pressed downwardly by the first locking surface 131, so that the second locking member 71 moves downwardly relative to the sliding block 70, and then the locking cam 714 is engaged with the limiting cam 723, limiting the freedom of the second locking member 71 to swing toward the first side edge 121. At this time, the locking cam 711 on the second locking member 71 remains in a state of being disengaged from the second locking groove 14, and then the locking cam 713 is pressed downwardly by the first locking surface 131. The lumbar support 20 is then moved downward until the lever 713 on the second locking member 71 contacts the second limiting surface 132, and the lumbar support 20 continues to be moved downward. The second limiting surface 132 pushes the lever 713 upward, causing the second locking member 71 to move upward relative to the slider 70, and the locking boss 714 is disengaged from the limiting boss 723, and the swinging freedom of the second locking member 71 is no longer limited. Under the elastic stress of the second spring 74, the second locking member 71 can swing toward the first side edge 121, and then the locking boss 711 can be snapped into the second slot 14. At this time, the lumbar support 20 can be lifted upward to a corresponding height, so that the locking boss 711 is snapped into the second slot 14 at a corresponding position, and the height adjustment of the lumbar support 20 is completed.

[0043] In order to make the structure of the entire slider 70 more compact, a recess 721 is provided on the slide seat 72 , and the second locking member 71 and the second spring 74 are both located in the recess 721 . The cover plate 73 is fixed to the slide seat 72 to cover the recess 721 .

[0044] The seat of the utility model comprises the above-mentioned lumbar support assembly of the seat, and other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0045] 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. The lumbar support assembly of the seat is characterized in that: It includes a bracket, a first movable seat, a second movable seat, a waist support, and an elastic member; The first movable seat is mounted on the bracket in a manner that it can be adjusted in the up-down direction, and the second movable seat is mounted on the first movable seat in a manner that it can be adjusted in the front-back direction; A connecting seat is arranged on the waist support, and the connecting seat is pivotally connected to the second movable seat through a rotating shaft extending in the left-right direction. The elastic member is arranged between the connecting seat and the second movable seat and is staggered with the central axis of the rotating shaft by a certain distance in the vertical direction to provide an elastic stress applied to the connecting seat.

2. The lumbar support assembly of a seat as claimed in claim 1, characterized in that: A retaining wall is respectively provided on both sides of the connecting seat, the second movable seat is confined between the two retaining walls, and the rotating shaft crosses the two retaining walls and the second movable seat to pivotally connect the connecting seat to the second movable seat; a limiting groove is provided on one side of the second movable seat, and a limiting block embedded in the limiting groove is provided on the retaining wall, and the limiting block swings between the top surface and the bottom surface of the limiting groove to limit the swinging amplitude of the connecting seat relative to the second movable seat.

3. The lumbar support assembly of a chair as claimed in claim 2, characterized in that: A groove is provided on the end surface of the second movable seat facing the connecting seat, and the groove is recessed away from the connecting seat. The elastic member is a spring embedded in the groove, one end of the spring is against the bottom surface of the groove, and the other end is against the connecting seat. A first axial hole is provided at one end of the second movable seat close to the connecting seat, and a second axial hole is provided on the retaining wall. The rotating shaft is a locking screw that crosses the first axial hole and the second axial holes of the two retaining walls.

4. The lumbar support assembly of a chair as claimed in claim 1, characterized in that: The second movable seat is provided with a plurality of first slots arranged in the front-to-back direction, the first movable seat is provided with a first locking member and a first spring, the first locking member includes a locking column matching the first slot, the first locking member is movably mounted on the first movable seat so that the locking column can move in the left-right direction between a position embedded in the first slot and a position disengaged from the first slot, and the first spring is used to provide an elastic stress applied to the first locking member so that the locking column always maintains a tendency to move toward the first slot.

5. The lumbar support assembly of a chair as claimed in claim 4, characterized in that: The second movable seat is provided with a guide groove extending in the front-to-back direction, the guide groove includes a first side wall, a second side wall opposite to the first side wall, a first end connected between the rear ends of the first side wall and the second side wall, and a second end connected between the front ends of the first side wall and the second side wall, the first clamping groove is formed by the first side wall being recessed in a direction away from the second side wall, and a portion of the guide groove between the first clamping groove and the first end located at the rear side forms a guide section; the first locking member is configured to be able to move relative to the first movable seat in the front-to-back direction, and to swing relative to the first movable seat in the left-to-right direction; the locking column of the first locking member can The locking member is engaged with the locking portion and the locking portion is engaged with the locking member, and the locking member is engaged with the locking member and the locking portion is engaged with the locking member, so that the locking member can be kept in a position away from the first slot.

6. The lumbar support assembly of a chair as claimed in claim 5, characterized in that: The first movable seat is provided with an installation groove, which includes a rear end face and a front end face opposite to the rear end face, and a rear groove recessed backwards is provided on the rear end face, and the locking portion is a front groove recessed forwards from the front end face; the first locking member includes a rotating end and a locking end opposite to the rotating end, the rotating end is embedded in the rear groove and can rotate in the rear groove, and the locking end can be clamped in or disengaged from the front groove as the first locking member moves forward and backward relative to the first movable seat; when the locking end is clamped in the front groove, the locking column is in a position away from the first clamping groove, and the first clamping groove includes a supporting wall extending from the first side wall in a direction away from the second side wall, and a guide wall extending to the first side wall at an angle from a side of the supporting wall away from the second side wall.

7. The lumbar support assembly of a chair as claimed in claim 6, characterized in that: The first movable seat is provided with a guide slot extending in the front-to-back direction, and the second movable seat is slidably connected in the guide slot; the mounting slot is formed by an upward depression in the bottom surface of the first movable seat, and a bottom cover covering the mounting slot opening is fixed under the first movable seat; the bottom surface of the second movable seat is provided with a guide groove extending in the front-to-back direction, and the bottom cover is provided with a guide column slidably embedded in the guide groove, and a convex rib matching the guide column is provided at the rear of the guide groove.

8. The lumbar support assembly of a chair as claimed in claim 1, characterized in that: The bracket is provided with a sliding groove extending in the up-down direction, the sliding groove includes a first side and a second side opposite to the first side, and the first movable seat is provided with a sliding block slidably embedded in the sliding groove; a plurality of second clamping grooves arranged in the up-down direction are provided on the first side of the sliding groove; a second locking member and a second spring are installed on the slider, and a locking boss is provided on the second locking member, and the second locking member and the slider are movably matched to enable the locking boss to move between a position clamped in the second clamping slot and a position disengaged from the second clamping slot; the second spring is used to provide an elastic stress applied to the second locking member so that the second locking member always maintains a tendency to move toward the second clamping slot.

9. The lumbar support assembly of a chair as claimed in claim 8, characterized in that: The second locking member is provided with an axis head, and the slider is provided with a long groove extending in the up-down direction, and the axis head is embedded in the long groove so that the second locking member can move relative to the slider in the up-down direction and swing relative to the slider in the left-right direction; the second locking member is also provided with a lever and a locking boss, and the lever and the positioning boss are respectively located on both sides of an end of the second locking member away from the axis head, and the slider is provided with a limiting boss that cooperates with the locking boss; when the axis head moves to the lower end of the long groove in the up-down direction, the limiting boss combines with the locking boss to limit the second locking member from swinging toward the second positioning slot The locking cam is adapted to engage with the locking cam when the second locking member moves downward along the long groove; the locking cam is adapted to engage with the locking cam when the second locking member moves upward along the long groove; the second locking cam comprises a supporting surface extending from the first side edge toward the side away from the second side edge, and an inclined surface extending from a side of the supporting surface away from the second side edge to the first side edge.

10. A seat, characterized in that: A lumbar support assembly for a seat comprising any one of claims 1-9.

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