Seat backrest

Abstract

The utility model discloses a seat backrest which is characterized in that the seat backrest comprises a back plate, a backrest support, a back frame, a waist rest supporting seat and a waist rest, the backrest support is movably arranged on the back plate, the back frame and the waist rest supporting seat are respectively arranged on the backrest support, and the waist rest is arranged on the waist rest supporting seat; the waist rest supporting seat comprises a waist rest fixing seat, a waist rest sliding seat assembly and a sliding seat spring assembly, the waist rest is hinged to the waist rest sliding seat assembly, the waist rest fixing seat is provided with a sliding groove, the waist rest sliding seat assembly is in sliding fit with the sliding groove, and the sliding seat spring assembly is connected between the waist rest sliding seat assembly and the waist rest fixing seat in the sliding direction. And the waist rest can automatically slide down when being pressed, but can automatically reset after the pressure is cancelled. The support is good in stability, convenient to use and adjust, and attractive and elegant.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, and more specifically to a seat backrest. Background Art

[0002] At present, many chairs on the market have a fixed connection structure between the backrest and the seat. When the user is leaning back, the backrest of the chair, especially the lumbar support, is separated from the human waist, forming a gap directly, causing the chair to lose support for the human waist, commonly known as "running waist". The human spine cannot be effectively supported, and long-term sitting can easily lead to many health problems. In order to solve the above problems, those skilled in the art have improved the existing chairs. For example, Chinese patent application No. 202020317760.6 discloses a computer chair, which belongs to a chair, wherein a lumbar support component is movably installed on the backrest bracket, and the lumbar support component can reciprocate in the vertical direction on the backrest bracket; the lumbar support component includes a lumbar support bracket, a main lumbar support plate and two auxiliary lumbar support plates, the lumbar support bracket can be lifted and lowered on the backrest bracket, the main lumbar support plate is fixedly installed on the lumbar support bracket, and the two auxiliary lumbar support plates are placed on opposite sides of the main lumbar support plate; a supporting part for supporting the human waist is formed between the main lumbar support plate and the two auxiliary lumbar support plates. Relieve the pressure on the lumbar spine and the outer side of the waist, and reduce the occurrence of diseases such as the waist and cervical spine. However, the disadvantage is that the main lumbar support plate and the two auxiliary lumbar support plates are fixed and non-adjustable structures, and cannot be adjusted according to the specific conditions of different people's body shapes, resulting in a mediocre experience for some users when using the lumbar support plate. Therefore, it is necessary to further improve the existing technology. Summary of the invention

[0003] The purpose of the utility model is to solve the deficiencies of the prior art and to provide a stable, reliable and easy-to-adjust seat back.

[0004] The utility model adopts the following technical solutions to achieve the above-mentioned purpose: a seat back, characterized in that it includes a back plate, a backrest bracket, a back frame, a lumbar support seat, and a lumbar support, the backrest bracket is movably arranged on the back plate, the back frame and the lumbar support seat are respectively arranged on the backrest bracket, and the lumbar support is arranged on the lumbar support seat.

[0005] The lumbar support seat includes a lumbar support fixed seat, a lumbar support sliding seat assembly, and a sliding seat spring assembly. The lumbar support is hinged to the lumbar support sliding seat assembly. The lumbar support fixed seat is provided with a sliding groove. The lumbar support sliding seat assembly slides in cooperation with the sliding groove. The sliding seat spring assembly is connected between the lumbar support sliding seat assembly and the lumbar support fixed seat along the sliding direction, so that the lumbar support can automatically slide down when under pressure, but can automatically reset after the pressure is released.

[0006] As a further illustration of the above scheme, a card slot and a positioning card block are provided on the back plate, inner teeth are provided on both sides of the card slot, the inner teeth are movably engaged with the positioning card block, and the positioning card block is connected to the backrest bracket.

[0007] A lifting guide mechanism is arranged between the back panel and the backrest bracket, and the lifting guide mechanism includes a plurality of linear guide grooves and positioning guide columns arranged in the linear guide grooves; through the guiding action of the lifting guide mechanism, the backrest bracket can be lifted and moved relative to the back panel, and the cooperation of the positioning block and the slot can temporarily lock the back panel bracket at a certain height position of the back panel.

[0008] Furthermore, a supporting spring piece is connected between the backrest bracket and the back frame, and the supporting spring piece is Z-shaped, so that the back frame can be pressed down and rebound.

[0009] Furthermore, the backrest bracket includes a lower bracket seat and left and right support arms connected to the top of the lower bracket seat. Rubber pads are provided at the connection positions of the left and right support arms and the back frame, which have a certain stabilizing structural effect.

[0010] Furthermore, the lumbar support seat is provided with an inclined surface, and the lumbar support sliding seat assembly is movably supported on the inclined surface and can move back and forth along the inclined surface; a baffle is provided at the end of the slide groove of the lumbar support fixed seat, and the sliding seat spring assembly is connected between the baffle and the lumbar support sliding seat assembly.

[0011] Furthermore, the lumbar support sliding seat assembly comprises an outer sliding sleeve and a core column, a spring is arranged on the top of the core column, and the spring is press-fitted with the top of the lumbar support.

[0012] Furthermore, the back plate is provided with a guide groove parallel to the slide groove, and the core column extends into the guide groove after passing through the outer sliding sleeve and is in sliding contact with the guide groove.

[0013] Furthermore, a groove is provided on the side wall of the outer sliding sleeve, and a swing block and a return spring are arranged in the groove, and the return spring is positioned and pressed between the swing block and the inner wall of the groove; a rack groove is provided on the side of the core column, and a protrusion is provided on the side of the swing block to extend toward the rack groove, and teeth are arranged in the rack groove to movably engage with the protrusion.

[0014] The beneficial effects that can be achieved by the utility model by adopting the above technical solution are:

[0015] The utility model adopts a seat back structure which is mainly composed of a back plate, a backrest bracket, a back frame, a lumbar support seat and a lumbar support. The backrest bracket is movably arranged on the back plate, the back frame and the lumbar support seat are respectively arranged on the backrest bracket, and the lumbar support is arranged on the lumbar support seat; the lumbar support seat comprises a lumbar support fixing seat, a lumbar support sliding seat assembly, and a sliding seat spring assembly; the lumbar support is hinged with the lumbar support sliding seat assembly, the lumbar support fixing seat is provided with a sliding groove, the lumbar support sliding seat assembly slides in cooperation with the sliding groove, and the sliding seat spring assembly is connected between the lumbar support sliding seat assembly and the lumbar support fixing seat along the sliding direction, so that the lumbar support can automatically slide down when under pressure, but can automatically reset after the pressure is cancelled, can match and fit the user's waist, improve good support, and have good comfort.

[0016] The utility model provides a lifting guide mechanism between the back plate and the backrest bracket, which can realize the lifting and moving of the backrest bracket relative to the back plate; and mutually cooperating positioning blocks and slots are provided, which can temporarily lock the back plate bracket at a certain height position of the back plate, thereby realizing the lifting and adjusting of the backrest bracket and the back frame thereon, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 This is a schematic diagram of the backrest bracket structure of the utility model.

[0019] Figure 3 It is a schematic diagram of the structure of the lumbar support seat.

[0020] Figure 4 It is a schematic diagram of the connection structure between the lumbar support fixed seat and the lumbar support sliding seat assembly.

[0021] Figure 5 This is a schematic diagram of the core column installation structure.

[0022] Explanation of the accompanying drawings: 1, back panel 2, backrest bracket 2-1, lower bracket seat 2-2, left support arm 2-3, right support arm 3, back frame 4, lumbar support seat 4-1, lumbar support fixing seat 4-11, slide groove 4-12, baffle 4-2, lumbar support sliding seat assembly 4-21, outer sliding sleeve 4-211, slot 4-212, swing block 4-213, return spring 4-214, protrusion 4-22, core column 4-221, rack groove 4-222, tooth 4-23, spring 4-3, sliding seat spring assembly 5, lumbar support 6, supporting spring piece 7, rubber pad. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, "at least" means one or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise specified and limited, the terms "assembly", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the utility model, unless otherwise specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "below" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the height of the second feature. A first feature being "above", "below" and "below" a second feature includes that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the second feature.

[0027] The following is a further description of the specific implementation of the utility model in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the utility model are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the utility model, and cannot be understood as limiting the utility model.

[0028] like Figure 1-Figure 5As shown, the utility model is a seat backrest, including a back plate 1, a backrest bracket 2, a back frame 3, a lumbar support seat 4, and a lumbar support 5. The back frame 3 and the lumbar support 5 are respectively annular and bent at a certain arc to increase the fit with the back and waist of the human body and improve the stability of the support. The backrest bracket 2 is movably arranged on the back plate 1, the back frame 3 and the lumbar support seat 4 are respectively arranged on the backrest bracket 2, and the lumbar support 5 is arranged on the lumbar support seat 4. A supporting spring piece 6 is connected between the backrest bracket 2 and the back frame 3, and the supporting spring piece is Z-shaped. In this embodiment, the supporting spring piece 6 is connected to the lower end of the back frame. When the user presses down on his back, the supporting spring piece can provide a certain elastic support, which is comfortable. Moreover, it can rebound after the pressure is removed, and does not affect the appearance. The backrest bracket 2 includes a lower bracket seat 2-1 and left and right support arms 2-2 and 2-3 connected to the top of the lower bracket seat to form a Y-shaped support structure; rubber pads 7 are provided at the connection positions of the left and right support arms and the back frame, which have a certain stabilizing structural effect.

[0029] The lumbar support seat 4 includes a lumbar support fixed seat 4-1, a lumbar support sliding seat assembly 4-2, and a sliding seat spring assembly 4-3. The lumbar support 5 is hinged with the lumbar support sliding seat assembly 4-2. The lumbar support fixed seat 4-1 is provided with a slide groove 4-11. The lumbar support sliding seat assembly 4-2 slides with the slide groove 4-11. The sliding seat spring assembly is connected between the lumbar support sliding seat assembly 4-2 and the lumbar support fixed seat 4-1 along the sliding direction, so that the lumbar support can automatically slide down when it is pressed, but can automatically reset after the pressure is removed. The lumbar support fixed seat 4-1 is provided with an inclined surface, and the lumbar support sliding seat assembly is movably supported on the inclined surface. In order to make the lumbar support sliding seat assembly move back and forth along the inclined surface more smoothly, a plurality of rollers are arranged on the contact surface between the lumbar support sliding seat assembly and the inclined surface; a baffle 4-12 is arranged at the end of the slide groove of the lumbar support fixed seat 4-1. The baffle is movably installed. By arranging plug-in positions on both sides of the end of the slide groove, the baffle is positioned between the plug-in positions on both sides, which is convenient for disassembly and assembly. The sliding seat spring assembly is connected between the baffle and the lumbar support sliding seat assembly. In this embodiment, the sliding seat spring assembly includes two parallel springs. The two parallel springs have consistent size and performance, ensuring that the sliding process of the lumbar support sliding seat assembly is smoother.

[0030] The lumbar support sliding seat assembly 4-2 includes an outer sliding sleeve 4-21 and a core column 4-22. A spring 4-23 is arranged on the top of the core column. The spring is pressed against the top of the lumbar support. When the lumbar support is pressed down, the spring can provide a reverse elastic force, providing good support for the user's waist and better comfort. The back plate 1 is provided with a guide groove parallel to the slide groove. The core column extends into the guide groove after passing through the outer sliding sleeve and slides in contact with the guide groove. The side wall of the outer sleeve 4-21 is provided with a groove 4-211, and a swing block 4-212 and a return spring 4-213 are arranged in the groove, and the return spring is positioned and pressed between the swing block and the inner wall of the groove; the side of the core column 4-22 is provided with a rack groove 4-221, and the side of the swing block is provided with a protrusion 4-214 extending toward the rack groove, and the protrusion is inclined. There are teeth 4-222 in the rack groove and the protrusion 4-214 is movably engaged with each other, so that when the core column moves forward and backward relative to the outer sleeve, it is locked in a certain position by the cooperation of the teeth and the protrusion, thereby improving stability.

[0031] Compared with the prior art, the utility model adopts a method of movably arranging the backrest bracket on the back plate, and the back frame and the lumbar support seat are respectively arranged on the backrest bracket, wherein the back frame is a fixed installation structure, but the lifting position can be adjusted by the backrest bracket; and the lumbar support can be adjusted up and down and front and back, and the lumbar support can automatically slide down when under pressure, but can automatically reset after the pressure is released. Combined with the lumbar support sliding seat assembly structure that can adjust the position front and back, it can adapt to the usage needs of different types of users and has good comfort.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A seat back, characterized in that: It includes a backboard, a backrest bracket, a back frame, a lumbar support seat, and a lumbar support. The backrest bracket is movably arranged on the backboard, the back frame and the lumbar support seat are respectively arranged on the backrest bracket, and the lumbar support is arranged on the lumbar support seat. The lumbar support seat includes a lumbar support fixed seat, a lumbar support sliding seat assembly, and a sliding seat spring assembly. The lumbar support is hinged to the lumbar support sliding seat assembly. The lumbar support fixed seat is provided with a sliding groove. The lumbar support sliding seat assembly slides in cooperation with the sliding groove. The sliding seat spring assembly is connected between the lumbar support sliding seat assembly and the lumbar support fixed seat along the sliding direction.

2. A seat back according to claim 1, characterized in that: The back plate is provided with a card slot and a positioning card block, and inner teeth are respectively provided on both sides of the card slot, the inner teeth are movably connected with the positioning card block, and the positioning card block is connected to the backrest bracket; A lifting guide mechanism is arranged between the back plate and the backrest bracket, and the lifting guide mechanism comprises a plurality of linear guide grooves and positioning guide columns arranged in the linear guide grooves.

3. The seat back according to claim 1, characterized in that: A supporting spring piece is connected between the backrest bracket and the back frame, and the supporting spring piece is in a Z shape.

4. The seat back according to claim 1, characterized in that: The backrest bracket comprises a lower bracket seat and left and right support arms connected to the top of the lower bracket seat, and rubber pads are arranged at the connection positions of the left and right support arms and the back frame.

5. The seat back according to claim 1, characterized in that: The lumbar support seat is provided with an inclined surface, and the lumbar support sliding seat assembly is movably supported on the inclined surface and can move back and forth along the inclined surface; a baffle is provided at the end of the slide groove of the lumbar support fixed seat, and the sliding seat spring assembly is connected between the baffle and the lumbar support sliding seat assembly.

6. The seat back according to claim 1, characterized in that: The lumbar support sliding seat assembly comprises an outer sliding sleeve and a core column. The top of the core column is provided with a spring, and the spring is press-fitted with the top of the lumbar support.

7. The seat back according to claim 6, characterized in that: The back plate is provided with a guide groove parallel to the slide groove. The core column extends into the guide groove after passing through the outer sliding sleeve and is in sliding contact with the guide groove.

8. The seat back according to claim 1, characterized in that: The side wall of the outer sliding sleeve is provided with a groove, and a swing block and a return spring are arranged in the groove, and the return spring is positioned and pressed between the swing block and the inner wall of the groove; the side of the core column is provided with a rack groove, and the side of the swing block is provided with a protrusion extending toward the rack groove, and the rack groove has teeth that are movably engaged with the protrusion.

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