Chair waist rest structure

Abstract

According to the chair waist rest structure, the center of the top of a waist rest is connected with a backrest through an elastic device, the two sides of the bottom of the waist rest are connected with the backrest through elastic pieces respectively, and the elastic device and the elastic pieces apply acting force pointing to the front of a chair to the waist rest. When a user sits down, the waist and back part of the user leans backwards, and the elastic device and the elastic piece provide buffering for the waist rest and the waist of the human body, so that damage to bones and muscles caused by overlarge actions is avoided; after a user sits down, the waist rest can provide upward and forward supporting force for the waist of the human body under the elastic action of the elastic device and the elastic piece, so that the human body is better supported; and when the sitting posture of the user is improper or the sitting posture is adjusted, the waist rest can effectively keep the fit degree with the back side of the waist of the human body under the action of the elastic device and the elastic piece, so that the effectiveness of supporting the waist of the human body and the use comfort are ensured, and the health of the human body is protected.

Description

Technical Field

[0001] The utility model relates to a chair, in particular to a lumbar support structure of a chair. Background Art

[0002] In order to support the back of the waist to improve the comfort of use, people will place soft pads such as lumbar pillows and throw pillows on traditional chairs. In order to improve the convenience of use, many current ergonomic chairs are equipped with a lumbar support at the bottom of the backrest. The lumbar support is generally of a fixed structure, and some lumbar supports are installed by means of hinge to better fit the lumbar and back angles of the user when sitting and leaning. There are also some lumbar supports on chairs that are set as adjustable structures that can move up and down or back and forth. However, no matter which type of ergonomic chair it is, the lumbar support only aims to provide passive support for the human waist. If the user's sitting posture is incorrect or the sitting posture changes after sitting and leaning for a long time, the lumbar support cannot effectively fit the human waist, thus unable to ensure the effectiveness and comfort of the support, which is not conducive to human health. Content of the Utility Model

[0003] The purpose of the utility model is to provide a lumbar support structure of a chair that maintains the degree of fit with the back of the human waist through elasticity, so as to better meet the ergonomic requirements and improve the comfort of use.

[0004] The lumbar support structure of the chair described in the utility model includes a lumbar support installed on the backrest. The top of the lumbar support is hinged to the backrest, and an elastic member for supporting the lumbar support is installed between the bottom or middle of the lumbar support and the backrest. The elastic member exerts a force on the lumbar support pointing forward of the chair.

[0005] Further, two ear plates extending towards the backrest are provided at the top of the lumbar support, and an installation groove is provided on the backrest. The two ear plates extend side by side to the installation groove and are hinged through a rotating shaft; a torsion spring is sleeved on the rotating shaft, and the two ends of the torsion spring are respectively abutted against the backrest and the lumbar support.

[0006] Further, a top plate is provided between the installation groove and the end of the torsion spring, and a pressure plate is provided between the lumbar support and the end of the torsion spring.

[0007] Further, a hanging beam and a top block are provided between the two ear plates of the lumbar support, and the hanging beam is horizontally arranged above the top block. The top of the pressure plate is bent and hooked on the hanging beam, and the middle of the pressure plate abuts against the top block.

[0008] Further, elastic members are installed between both sides of the bottom of the lumbar support and the backrest.

[0009] Further, the elastic member is a compression spring. Spring seats are respectively provided at the front and back opposite positions of the backrest and the lumbar support. Annular grooves for the ends of the compression spring to be inserted are respectively provided on the opposite sides of the two spring seats, and the two ends of the compression spring are respectively clamped in the annular grooves of the two spring seats.

[0010] Further, there is an elastic sleeve with scalable deformation. The elastic sleeve is sleeved outside the compression spring and its two ends are respectively connected to the two spring seats.

[0011] Alternatively, the elastic member is an elastic sleeve with scalable deformation, and the two ends of the elastic sleeve are respectively connected to the backrest and the lumbar support.

[0012] Or, the elastic member includes a hinge plate and a fixed plate arranged oppositely. The side of the hinge plate facing away from the fixed plate is hinged to the backrest, the side of the fixed plate facing away from the hinge plate is fixedly installed on the lumbar support, a spring is installed between the opposite sides of the hinge plate and the fixed plate, and the two ends of the hinge plate and the two ends of the fixed plate are respectively connected by two rotating plates. One ends of the two rotating plates are hinged to each other and the other ends are respectively hinged to the ends of the hinge plate and the fixed plate.

[0013] Further, the hinge plate, the fixed plate and the rotating plates are all arc-shaped with the centers of the circles facing the spring.

[0014] Or, the elastic member includes a hinge plate and a fixed plate arranged oppositely. The side of the hinge plate facing away from the fixed plate is hinged to the backrest, the side of the fixed plate facing away from the hinge plate is fixedly installed on the lumbar support, and a spring is installed between the opposite sides of the hinge plate and the fixed plate; one ends of the hinge plate and the fixed plate respectively extend out arc-shaped telescopic plates. The end of the telescopic plate on the hinge plate is hinged to the fixed plate, the end of the telescopic plate on the fixed plate is hinged to the hinge plate, and a plurality of concave grooves are arranged at intervals on the inner side of the arc in the middle of the telescopic plate.

[0015] In the chair lumbar support structure of the present utility model, the top of the lumbar support is hinged to the backrest, and the bottom is connected to the elastic member, so that the lumbar support has a tendency to flip forward around the hinge end; when the user sits down, his lumbar and dorsal regions will lean backward, that is, lean towards the backrest and the lumbar support. The lumbar support is pressed and drives the elastic member to compress, so as to provide buffering for the human waist and avoid damage to bones and muscles caused by excessive movements; after the user sits down, the lumbar support can provide an upward and forward supporting force for the human waist under the elastic action of the elastic member, so as to better support the human body; when the user's sitting posture is improper or the sitting posture is adjusted, the lumbar support can effectively maintain the fitting degree with the back side of the human waist under the action of the elastic member, so as to ensure the effectiveness of the support for the human waist and the comfort of use, which is also beneficial to protecting human health. Description of the Drawings

[0016] Figure 1 、 2 is a schematic structural diagram of the first embodiment of the chair lumbar support structure.

[0017] Figure 3 is a schematic connection structure diagram of the backrest and the elastic member.

[0018] Figure 4 is a schematic connection structure diagram of the lumbar support and the elastic member.

[0019] Figure 5 It is a schematic diagram of the connection structure of the backrest, lumbar support and elastic device.

[0020] Figure 6 It is a schematic diagram of the connection structure of the lumbar support and the elastic device.

[0021] Figure 7 It is a schematic diagram of the structure of the elastic device.

[0022] Figure 8 It is a partial schematic diagram of the local structure of the backrest where it is used to connect the elastic device.

[0023] Figure 9 It is a partial schematic diagram of the local structure of the lumbar support where it is used to connect the elastic device.

[0024] Figure 10 、 11 It is a schematic diagram of the structure of the elastic member in the second embodiment of the lumbar support structure of the chair.

[0025] Figure 12 、 13 It is a schematic diagram of the structure of the elastic member in the third embodiment of the lumbar support structure of the chair.

[0026] Reference numerals in the drawings: backrest 1, mounting groove 11, lumbar support 2, hanging beam 21, top block 22, ear plate 3, elastic member 4, hinge plate 41, fixing plate 42, spring 43, hinge plate 44, spring seat 5, clamping block 51, positioning cylinder 52, elastic sleeve 6, rotating shaft 7, torsion spring 8, top plate 9, pressing plate 10. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then such directional indications will also change accordingly.

[0029] If there are descriptions involving "first" or "second" in the embodiments of the present utility model, such descriptions of "first" or "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] Embodiment 1, as Figure 1-9 shown, the present utility model provides a chair lumbar support structure.

[0031] The chair lumbar support structure of this embodiment includes a lumbar support 2 installed on the backrest 1, and is characterized in that: the top of the lumbar support is hinged to the backrest, and an elastic member 4 for supporting the lumbar support is installed between the bottom or middle of the lumbar support and the backrest; the elastic member exerts a force on the lumbar support pointing towards the front of the chair, that is, in the front direction of the chair.

[0032] In the described chair lumbar support structure, the top of the lumbar support is hinged to the backrest, and the bottom is connected to the elastic member, so that the lumbar support has a tendency to flip forward around the hinge end; when the user sits down, his / her lumbar and dorsal regions will lean backward, that is, lean towards the backrest and the lumbar support, the lumbar support is pressed and drives the elastic member to compress, thereby providing buffering for the human waist; after the user sits down, the lumbar support can provide an upward and forward supporting force for the human waist under the elastic action of the elastic member; and when the user's sitting posture is improper or the sitting posture is adjusted, the lumbar support can effectively maintain the degree of fitting with the back side of the human waist under the action of the elastic member.

[0033] In the described chair lumbar support structure, elastic members 4 are installed between both sides of the bottom or middle of the lumbar support 2 and the backrest 1, and the elastic members can be one, two or more. On the one hand, this can improve the uniformity of the supporting force, and on the other hand, it can form different supporting strengths, enabling the lumbar support to more comprehensively fit the back side of the human waist, meeting the usage needs of people with different physiques, and can also ensure the supporting effect when the user adjusts the sitting posture. The elastic member 4 can be a rubber spring or a compression spring, such as Figure 3 、 4As shown, spring seats 5 are respectively provided at the front and rear relative positions of the backrest 1 and the lumbar support 2. Ring-shaped grooves for clamping the ends of the compression springs are respectively provided on the opposite sides of the two spring seats. The two ends of the compression spring are respectively clamped in the ring-shaped grooves of the two spring seats, thereby limiting and guiding the compression spring and providing a more stable support for the lumbar support. There is also an elastic sleeve 6 that can be elastically deformed. The elastic sleeve is sleeved outside the compression spring and the two ends are respectively connected to the two spring seats, enabling it to elastically deform in cooperation with the compression spring, and also protecting the compression spring and preventing dust, gravel, etc. from entering the compression spring and the spring seat and affecting their operation. In addition, the elastic sleeve can also be used alone as an elastic member to obtain a smaller elastic force to meet the needs of different people. The ring-shaped groove of the spring seat can be as Figure 3 shown in the backrest. The end face of the spring seat 5 is concave, and a cross-shaped block 51 protrudes outward from the center of the bottom of the concave part. The gap between the block and the inner wall of the concave part of the spring seat is the ring-shaped groove. The end of the compression spring is sleeved on the cross end of the block. The ring-shaped groove of the spring seat can also be as Figure 4 shown in the lumbar support. The end face of the spring seat 5 is concave, and a cylindrical positioning cylinder 52 protrudes outward from the center of the bottom of the concave part. The gap between the outer wall of the positioning cylinder and the inner wall of the concave part of the spring seat is the ring-shaped groove. The end of the compression spring is sleeved on the positioning cylinder, thereby forming a more stable connection.

[0034] In the lumbar support structure of the chair described above, in addition to being able to provide elastic members at the bottom or middle of the lumbar support 2, an elastic device can also be provided at the top. The elastic device also applies a force pointing forward of the chair to the lumbar support, forming a more effective buffer and a more comfortable support through the elastic forces at the upper and lower ends. The elastic device can be the same as the elastic member at the bottom of the lumbar support, or as Figures 5-9 shown. Two ear plates 3 extending towards the backrest 1 are provided at the top of the lumbar support 2. An installation groove 11 is provided on the backrest. The two ear plates extend side by side to the installation groove and are hinged through a rotating shaft 7. A torsion spring 8 is sleeved on the rotating shaft. The two ends of the torsion spring are respectively abutted against the backrest and the lumbar support, providing a more stable buffer and support for the lumbar support.

[0035] In addition, in order to further improve the stability and accuracy of the torsional spring elasticity on the backrest and lumbar support, a top plate 9 can be provided between the installation groove 11 and the end of the torsional spring 8 to avoid stress concentration and make the action of the elastic force more uniform. Similarly, a pressing plate 10 can also be provided between the lumbar support 2 and the other end of the torsional spring 8. The top plate can be fixed in the installation groove by screws. The lumbar support 2 is provided with a hanging beam 21 and a top block 22 between two ear plates 3, and the hanging beam is horizontally arranged above the top block. The top of the pressing plate 10 is bent and hooked on the hanging beam, and the middle of the pressing plate abuts against the top block. This can not only ensure the working stability but also improve the convenience of installation and disassembly. At the same time, it can also avoid problems such as structural damage and even fracture caused by the repeated force applied by the two ends of the torsional spring to the plastic parts between the installation groove of the backrest and the ear plates of the lumbar support during long-term use, extend the service life, and improve the safety performance.

[0036] In the lumbar support structure of the chair described above, the top of the lumbar support 2 can be directly connected to the backrest 1 in addition to being hinged to the backrest 1, and an elastic member, such as an elastic sheet, is installed between the lumbar support 2 and the backrest 1. An elastic member 4 for supporting the lumbar support is also installed between the bottom or middle of the lumbar support 2 and the backrest, and the elastic member can be one, two or more. Similarly, the comfort of the waist can be maintained through the elasticity up and down.

[0037] Embodiment 2 is as Figures 10-11 shown.

[0038] In the lumbar support structure of the chair in this embodiment, the elastic member 4 includes a hinged plate 41 and a fixed plate 42 arranged opposite to each other. The side of the hinged plate facing away from the fixed plate is hinged to the backrest 1, and the side of the fixed plate facing away from the hinged plate is fixedly installed on the lumbar support 2. A spring 43 is installed between the opposite sides of the hinged plate and the fixed plate. The two ends of the hinged plate and the two ends of the fixed plate are respectively connected by two rotating plates 44. One end of the two rotating plates is hinged to each other, and the other end is respectively hinged to the ends of the hinged plate and the fixed plate. At the same time, the hinged plate 41, the fixed plate 42 and the rotating plate 44 are all arcs with the center facing the spring 43, so that their ends are sequentially connected into an ellipse. Spring seats 5 are respectively provided on the opposite sides of the hinged plate 41 and the fixed plate 42, and annular grooves for the ends of the spring to be inserted are respectively provided on the opposite sides of the two spring seats. The two ends of the spring are respectively stuck in the annular grooves of the two spring seats. The rest is the same as in Embodiment 1.

[0039] In the lumbar support structure of the chair described above, the elastic member is sequentially a hinged plate, two rotating plates, a fixed plate, and two rotating plates along the circumferential direction, thus forming an elliptical structure. When the spring between the hinged plate and the fixed plate expands and is compressed, it drives the two mutually hinged rotating plates to rotate in opposite directions. The elastic member of this structure has a more stable deformation ability, can effectively improve the buffering and supporting effects of the lumbar support, and provide a more comfortable experience for the user.

[0040] Embodiment 3 is as follows Figures 12-13 as shown

[0041] In the chair lumbar support structure of this embodiment, the elastic member 4 includes a hinged plate 41 and a fixed plate 42 which are arranged oppositely. One side of the hinged plate facing away from the fixed plate is hinged to the backrest 1, and one side of the fixed plate facing away from the hinged plate is fixedly installed on the lumbar support 2. A spring 43 is installed between the opposite sides of the hinged plate and the fixed plate; one end of the hinged plate and the fixed plate respectively extends an arc-shaped telescopic plate 45. The end of the telescopic plate on the hinged plate is hinged to the fixed plate, and the end of the telescopic plate on the fixed plate is hinged to the hinged plate. And a plurality of concave grooves 46 are arranged at intervals on the inner arc of the middle part of the telescopic plate; the rest is the same as that of Embodiment 2.

[0042] In the chair lumbar support structure, the groove in the middle of the telescopic plate can be used as a deformation space so that the middle part of the arc-shaped telescopic plate can extend or contract with the deformation of the elastic member. It can not only limit the elastic deformation direction and protect the elastic member to ensure that the elastic member provides effective buffering and stable support for the lumbar support, but also improve the use comfort of the chair; the ends of the telescopic plate are hinged to the hinged plate and the fixed plate, which can better ensure the deformation effect and is also convenient for the installation and disassembly of the elastic member.

[0043] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A chair lumbar support structure, comprising a lumbar support (2) mounted on a backrest (1), characterized in that: The top of the lumbar support is hinged on the backrest, and an elastic member (4) for supporting the lumbar support is installed between the bottom or middle part of the lumbar support and the backrest, and the elastic member applies a force to the lumbar support directed toward the front of the chair.

2. The chair lumbar support structure according to claim 1, characterized in that: Two ear plates (3) extending in the direction of the backrest (1) are provided on the top of the lumbar support (2); a mounting groove (11) is provided on the backrest; the two ear plates extend in parallel to the mounting groove and are hinged via a rotating shaft (7); a torsion spring (8) is mounted on the rotating shaft, and two ends of the torsion spring are respectively against the backrest and the lumbar support.

3. The chair lumbar support structure according to claim 2, characterized in that: A top plate (9) is provided between the mounting groove (11) and the end of the torsion spring (8), and a pressure plate (10) is provided between the lumbar support (2) and the end of the torsion spring.

4. The chair lumbar support structure according to claim 3, characterized in that: The waist support (2) is provided with a hanging beam (21) and a top block (22) between the two ear plates (3), and the hanging beam is transversely arranged above the top block. The top of the pressing plate (10) is bent and hooked on the hanging beam, and the middle of the pressing plate abuts against the top block (22).

5. The chair lumbar support structure according to claim 1, characterized in that: Elastic parts (4) are installed between the two sides of the bottom of the waist support (2) and the backrest (1).

6. The chair lumbar support structure according to claim 1 or 5, characterized in that: The elastic member (4) is a compression spring. Spring seats (5) are respectively arranged at the front and rear opposite positions of the backrest (1) and the lumbar support (2). Annular grooves for the ends of the compression spring to be inserted into are respectively arranged on the opposite sides of the two spring seats. The two ends of the compression spring are respectively inserted into the annular grooves of the two spring seats.

7. The chair lumbar support structure according to claim 6, characterized in that: A retractable and deformable elastic sleeve (6) is provided, the elastic sleeve is arranged outside the compression spring and the two ends of the elastic sleeve are respectively connected to the two spring seats (5).

8. The chair lumbar support structure according to claim 1 or 5, characterized in that: The elastic member (4) is a retractable and deformable elastic sleeve, and two ends of the elastic sleeve are respectively connected to the backrest (1) and the lumbar support (2).

9. The chair lumbar support structure according to claim 1 or 5, characterized in that: The elastic member (4) comprises a hinged plate (41) and a fixed plate (42) which are arranged opposite to each other. The side of the hinged plate facing away from the fixed plate is hinged to the backrest (1), and the side of the fixed plate facing away from the hinged plate is fixedly mounted on the lumbar support (2). A spring (43) is installed between the opposite sides of the hinged plate and the fixed plate. The two ends of the hinged plate and the two ends of the fixed plate are connected respectively via two rotating plates (44). One end of the two rotating plates is hinged to each other and the other end is hinged to the end of the hinged plate and the fixed plate respectively.

10. The chair lumbar support structure according to claim 9, characterized in that: The hinged plate (41), the fixed plate (42) and the rotating plate (44) are all arc-shaped with the center of the circle facing the spring (43).

11. The chair lumbar support structure according to claim 1 or 5, characterized in that: The elastic member (4) comprises a hinge plate (41) and a fixed plate (42) which are arranged opposite to each other, the side of the hinge plate facing away from the fixed plate is hinged to the backrest (1), the side of the fixed plate facing away from the hinge plate is fixedly mounted on the lumbar support (2), and a spring (43) is mounted between the opposite sides of the hinge plate and the fixed plate; one end of the hinge plate and the fixed plate respectively extends an arc-shaped telescopic plate (45), the end of the telescopic plate on the hinge plate is hinged to the fixed plate, the end of the telescopic plate on the fixed plate is hinged to the hinge plate, and a plurality of concave grooves (46) are arranged at intervals on the arc-shaped inner side of the middle part of the telescopic plate.

Images