Seat conforming to human engineering

Abstract

The utility model discloses a seat according with ergonomics, which comprises a seat body, a chair back and a back support for supporting the chair back, the chair back is divided into two waist and back supporting pieces which are arranged in a bilateral symmetry mode, and the back support is provided with two supporting parts which are arranged in a bilateral symmetry mode. Each waist and back supporting piece is rotationally connected with the corresponding supporting part through a rotating shaft, a fulcrum is formed at the rotating joint, and an elastic piece for providing reset force after the waist and back supporting piece rotates is arranged between the waist and back supporting piece and the back bracket; the chair back rotates around the fulcrum when bearing leaning force of a user, and the two waist and back supporting pieces are close to the waist and the back of the user. According to the chair, when a user sits on the chair, the chair back can support the waist and the back of the user, and the burden of the waist and the back is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ergonomic seats, and particularly relates to an ergonomic seat. Background Art

[0002] Common ordinary chairs on the market, such as wooden chairs, plastic chairs, etc., have various deficiencies, such as insufficient support, lack of adjustment functions, poor comfort, and poor safety. These defects may lead to incorrect sitting postures, spinal problems, and physical discomfort, which are particularly serious for long-term users and children. Choosing a suitable chair is crucial because a good chair design can provide correct support, comfort, and safety, helping to maintain a healthy sitting posture and reduce spinal problems.

[0003] In response to the above problems, a utility model patent with the publication number "CN208524310U" discloses an adjustable learning chair that is beneficial to children's physical health. This utility model patent uses two lumbar and back support members as the backrest. Each of the two lumbar and back support members is connected to the back bracket through a torsion connector. When the user leans on the backrest, the angle of the lumbar and back support members is adjusted through the deformation of the torsion connector, enabling the back panel to wrap around both sides of the back, reducing the burden on the lumbar and back, and protecting spinal health. However, this utility model uses the deformation of the torsion connector to achieve the angle adjustment of the backrest. Generally, the backrest torsion is made of rubber. When the lumbar and back support members are subjected to a large leaning force, the torsion connector is not easily deformed, resulting in insufficient angle adjustment of the lumbar and back support members. Moreover, the torsion connector is a consumable part, and it generally breaks after about one year. Whether purchased through online channels or offline channels, the replacement backrest torsion is not inexpensive. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide an ergonomic seat. The seat adjusts two independent lumbar and back support members to an independent rotation mode, so that when the user sits and leans on the seat, the lumbar and back support members can rotate inward, and both sides of the backrest can automatically fit tightly against the user's lumbar and back, providing support for the user's lumbar and back, reducing the burden on the lumbar and back, and when the user leaves the seat, the backrest can automatically reset.

[0005] The technical solution of the utility model is realized as follows:

[0006] An ergonomic seat, comprising:

[0007] A seat, a backrest, and a backrest support for supporting the backrest. The backrest is divided into two left and right symmetrically arranged lumbar and back supports. The backrest support has two left and right symmetrically arranged support parts. Each lumbar and back support is rotatably connected to the corresponding support part through a rotating shaft and forms a fulcrum at the rotating connection. And an elastic member for providing a restoring force after the lumbar and back support rotates is provided between the lumbar and back support and the backrest support; with the fulcrum as the boundary, the lumbar and back support has an inner area and an outer area respectively arranged on both sides of the fulcrum; when the inner area of the backrest is subjected to a backward extrusion force, it rotates backward around the fulcrum, driving the outer area to rotate toward the middle of the backrest, approaching and fitting the user's lumbar and back.

[0008] Preferably, the lumbar and back support includes a plate-shaped body and a rotating support integrally formed at the middle position of the back surface of the plate-shaped body. The rotating support protrudes from the back surface of the plate-shaped body, and the end of the rotating support far from the back surface of the plate-shaped body is rotatably connected to the support part of the backrest support through a rotating shaft. The protruding length of the rotating support serves as the force arm, and the leaning force applied by the user to the lumbar and back support serves as the force acting on the force arm. The two are multiplied to obtain the torque. By means of the appropriate length of the rotating support, the user can make the backrest rotate without applying a large leaning force to the backrest. Through the rotating support integrally formed on the back surface of the plate-shaped body, on the one hand, it is rotatably connected to the support part of the backrest, so that when the backrest is subjected to a leaning force, the lumbar and back support can naturally fit the user's lumbar and back; on the other hand, by controlling the protruding length of the rotating support, the backrest can rotate when subjected to an appropriate force.

[0009] Preferably, a cavity for inserting the rotating support is provided on the support part. The cavity has a limiting surface for restricting the outward rotation of the rotating support, and a rotating space for the rotating support to rotate inward is formed in the cavity from the limiting surface to the middle direction of the backrest support. The cavity in the backrest support not only serves to install and accommodate the rotating support, but also can limit the rotation range of the backrest.

[0010] Preferably, the elastic member is a torsion spring sleeved on the rotating shaft. The torsion spring is easy to hide and does not occupy space. When the lumbar and back support changes from the stressed state to the unstressed state, the torsion spring can provide the elastic force for resetting the backrest, so as to realize the automatic reset of the lumbar and back support.

[0011] As a second choice, the elastic member is a compression spring provided between the rotating support and the backrest support. Using the compression spring can also realize the automatic reset of the lumbar and back support.

[0012] Preferably, a tubular cover is sleeved on the rotating support, and the front end of the tubular cover abuts against the back surface position of the plate-shaped body. Due to processing accuracy problems, the surface of the rotating support has unevenness such as burrs and rough edges. The tubular cover can cover these uneven surfaces, providing a smooth contact surface, so that the user will not be uncomfortable or inconvenient when using the chair, and at the same time increasing the overall aesthetics.

[0013] Preferably, in the left - right direction, the fulcrum is eccentrically arranged so that the width of the inner region is greater than that of the outer region; the eccentric fulcrum arrangement makes the rotation easier, and the user can rotate the backrest without applying a large force.

[0014] Preferably, there is a gap between the two lumbar - back support members. A soft pad is attached to the front ends of the two lumbar - back support members. The soft pad covers both the two lumbar - back support members and the gap between them. An outer cover that binds the three together is sleeved outside the soft pad and the two lumbar - back support members. The soft pad makes the lumbar support of the chair softer and more comfortable. When the user sits for a long time, they can feel better support and comfort, reducing the pressure on the waist; the design of the outer cover unifies the appearance of the lumbar - back support members and can also increase the overall aesthetics of the seat.

[0015] Preferably, there is a gap between the two lumbar - back support members, and an outer cover is sleeved outside the two lumbar - back support members together, making the surfaces of the left lumbar - back support member and the right lumbar - back support member appear unpartitioned; unifying the appearance of the two lumbar - back support members increases the overall aesthetics of the seat.

[0016] Preferably, the backrest support includes a vertically - arranged column and a T - shaped frame arranged at the upper end of the column. The T - shaped frame includes a horizontally - arranged crossbar and a longitudinal part integrally formed below the middle of the crossbar. Support parts are formed at both ends of the crossbar, and a connecting part for connecting to the seat is formed at the lower end of the column. The longitudinal part is sleeved and matched with the upper end of the column. The T - shaped frame is inserted and installed above the column and can be removed. When the height and body shape of the user change, the T - shaped frame and the backrest can be replaced to make the seat more suitable for the user.

[0017] The principle and beneficial effects of the present utility model adopting the above - mentioned technical solutions are as follows:

[0018] 1. The present utility model connects the two lumbar - back support members and the two support parts through a rotating shaft respectively. When the user sits on the seat and leans on the backrest, the lumbar - back support members can rotate around the rotating shaft. By designing an appropriate length of the rotating support and an appropriate cavity space of the support part, when the user applies a force of a certain intensity to the backrest, the backrest can rotate around the rotating shaft and approach and fit the user's waist and back. Through the elastic member arranged between the lumbar - back support member and the backrest support, when the backrest is not stressed, it can automatically reset.

[0019] 2. In the prior art, the back support and the lumbar support are connected by a twisting connector, and the angle adjustment of the backrest is achieved through the deformation of the twisting connector. The disadvantages are as follows: the larger the range of movement of the lumbar support, the less likely the rubber is to deform, and the reaction force provided is relatively large. Therefore, the rotation range of the backrest is limited by the deformation amount of the twisting connector. However, in the present utility model, by designing an appropriate length of the rotating support and an appropriate cavity space of the support part, the two lumbar supports are easy to rotate and can have a sufficient rotation range. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a three-dimensional structural schematic diagram of an ergonomic seat;

[0021] Figure 2 FIG. is a three-dimensional structural schematic diagram of an ergonomic seat with the sponge cover removed;

[0022] Figure 3 FIG. is a rear view of the back support and the backrest;

[0023] Figure 4 FIG. is an exploded view of the back support and the backrest;

[0024] Figure 5 FIG. is an exploded view of an ergonomic seat;

[0025] Figure 6 FIG. is an exploded view of the T-shaped frame, the backrest and the tubular cover;

[0026] Figure 7 FIG. is a rear view of the backrest;

[0027] Figure 8 FIG. is a three-dimensional structural schematic diagram of the backrest;

[0028] Figure 9 FIG. is a three-dimensional structural schematic diagram of the T-shaped frame;

[0029] Figure 10 FIG. is a top view of the seat without the applied leaning force after removing the outer cover and the cushion;

[0030] Figure 11 FIG. is a top view of the seat with the applied leaning force after removing the outer cover and the cushion;

[0031] Figure 12 FIG. is a top view of the seat without the applied leaning force when the outer cover and the cushion are put on;

[0032] Figure 13 FIG. is a top view of the seat with the applied leaning force when the outer cover and the cushion are put on;

[0033] Figure 14 FIG. is a side view of the back support, the backrest and the tubular cover;

[0034] The reference numerals in each figure are as follows: 1-seat, 2-backrest, 201-lumbar support, 201a-inner region, 201b-outer region, 202-plate body, 203-rotating support, 203a-groove body, 3-back support, 3a-T-shaped frame, 3b-column, 301-crossbar, 302-longitudinal part, 303-support part, 303a-cavity, 303b-limiting surface, 330c-rotating space, 4-cushion, 4a-outer cover, 5-tubular mask. Detailed implementation manners

[0035] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0036] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0037] The specific implementation manners of the present invention are as follows:

[0038] Please refer to Figure 1-14 , this embodiment provides an ergonomic seat, which includes a seat 1, a backrest 2 and a back support 3 for supporting the backrest 2. The backrest 2 is further divided into two symmetrically arranged lumbar supports 201 on the left and right. There are two symmetrically arranged support parts 303 on the back support 3. Each lumbar support 201 is rotatably connected to the corresponding support part 303 through a rotating shaft and forms a fulcrum at the rotating connection. Taking the fulcrum as the boundary, the lumbar support 201 has an inner region 201a and an outer region 201b respectively arranged on both sides of the fulcrum; when the user sits on the seat and leans on the backrest 2, the inner region 201a of the backrest 2 is subjected to a backward extrusion force and rotates backward around the fulcrum, while driving the outer region 201b to rotate towards the middle of the backrest 2, approaching and approaching the user's waist and back, providing support for the user's waist and back and reducing the burden on the waist and back. At the same time, an elastic member for providing a restoring force for the lumbar support 201 after rotation is also provided between the lumbar support 201 and the back support 3. When the lumbar support 201 is in an unloaded state, the elastic member can also provide a restoring force for its rotation.

[0039] Specifically, as Figure 7Or 8, the lumbar support 201 includes a plate-shaped body 202 and a rotating support 203 integrally formed at the middle position of the back surface of the plate-shaped body 202. The rotating support 203 protrudes from the back surface of the plate-shaped body 202, and the end of the rotating support 203 away from the back surface of the plate-shaped body 202 is rotatably connected to the support portion 303 of the back support 3 through a rotating shaft. The protruding length of the rotating support 203 serves as the force arm, and the leaning force applied by the user to the lumbar support 201 serves as the force acting on the force arm. The product of the two is the torque. By setting the appropriate length of the rotating support 203, the user can rotate the chair back 2 without applying a large leaning force to the chair back 2. Through the rotating support 203 integrally formed on the back surface of the plate-shaped body 202, on the one hand, it is rotatably connected to the support portion 303 of the back support 3, so that when the chair back 2 is subjected to a leaning force, the lumbar support 201 can naturally fit the user's waist and back; on the other hand, by controlling the protruding length of the rotating support 203, the chair back 2 can rotate when subjected to an appropriate force.

[0040] More specifically, please refer to Figure 4 The specific structure of the back support 3 is as follows: it includes a longitudinally arranged column 3b and a T-shaped frame 3a provided at the upper end of the column 3b. The T-shaped frame 3a includes a horizontally arranged crossbar 301 and a longitudinal portion 302 integrally formed below the middle of the crossbar 301. Support portions 303 are formed at both ends of the crossbar 301. The specific connection relationship of the back support 3 is as follows: the lower end of the column 3b is connected to the seat 1, the two support portions 303 of the T-shaped frame 3a are respectively rotatably connected to the two lumbar supports 201 through rotating shafts, and the longitudinal portion 302 is sleeved and fitted with the upper end of the column 3b. An insertion cavity is pre-opened at the upper end of the column 3b. After the longitudinal portion 302 of the T-shaped frame 3a is inserted into the insertion cavity, the two are locked together by screws. By adopting the above method, the T-shaped frame 3a can be removed. When the height and body shape of the user change, the T-shaped frame 3a and the chair back 2 can be replaced to make the seat more suitable for the user.

[0041] Furthermore, the structures of the support portions 303 at both ends of the crossbar 301 are as shown in Figure 9As shown, the support portion 303 is provided with a cavity 303a for inserting the rotating support 203, and the cavity 303a has a limiting surface 303b for limiting the rotation of the rotating support 203 toward the outside, and from the limiting surface 303b to the middle of the back support 3, a rotation space 303c for the rotating support 203 to rotate inward is formed in the cavity 303a. The cavity 303a in the support portion 303 not only plays the role of installing and accommodating the rotating support 203, but also can limit the rotation distance of the chair back 2. When the outer area 201b of the waist and back support 201 is under force or the waist and back support 201 is not under force, the rotating support 203 is pressed against the limiting surface 303b in the cavity 303a under the action of the elastic member, so that the chair back 2 cannot rotate outward; when the inner area 201a of the waist and back support 201 is under force, the rotating support 203 leaves the limiting surface 303b in the cavity 303a and rotates toward the inside of the cavity 303a.

[0042] like Figure 6 and Figure 14 As shown, a tubular cover 5 is sleeved on the rotating support 203, and the front end of the tubular cover 5 is against the back of the plate-like body 202. Due to the problem of processing accuracy, the surface of the rotating support 203 has burrs and rough edges, and the tubular cover can cover these uneven surfaces, providing a smooth contact surface, so that the user will not feel discomfort or inconvenience when using the chair, and this component can also increase the overall aesthetics of the chair.

[0043] Furthermore, the plate-like body 202 of the two waist and back support members 201 is structured as follows: Figure 7 As shown, in the left-right direction, the fulcrum is eccentrically arranged so that the width of the inner area 201a is greater than the width of the outer area 201b; the eccentric fulcrum arrangement makes rotation easier, and the user does not need to apply much force to rotate the chair back.

[0044] In one embodiment, the elastic member is a torsion spring sleeved on the rotating shaft. The function of the torsion spring is specifically realized as follows: a torsion bar is provided at the upper and lower ends of the torsion spring, one end of which is against the cavity 303a in the support part 303, and the other end is against the rotating support 203. When the chair back 2 is not subjected to force, the torsion spring can prevent the two waist and back support members 201 from rotating and shaking at will; when the chair back 2 is subjected to a leaning force, the force is transmitted to the torsion bar through the support part 303, so that the two waist and back support members 201 rotate respectively, and the torsion spring is deformed; when the chair back 2 changes from a stressed state to a non-stressed state, the deformation of the torsion spring disappears and returns to its original state, converting the deformation into mechanical energy, so that the waist and back support member 201 rotates to a naturally non-stressed position, thereby realizing the automatic reset of the waist and back support member 201. In addition, the torsion spring is easy to hide, does not take up space, and can be directly sleeved on the rotating shaft.

[0045] When using a torsion spring as the elastic member, the installation steps between the chair back 2 and the back support 3 are as follows: First, put the tubular mask 5 on the rotating support 203, then place the torsion spring into the groove 203a preset in the middle of the rotating support 203, and then install the rotating support 203 together with the torsion spring into the cavity 303a in the support part 303. Finally, install the rotating shaft. The rotating shaft needs to pass through the hole preset in the support part 303, through the torsion spring, and through the rotating support 203 to string these three together, and then lock the rotating shaft.

[0046] In another embodiment, the elastic member is a compression spring arranged between the rotating support 203 and the back support 3. As the same elastic member, the compression spring and the torsion spring have a similar action mechanism. The disadvantage is that the compression spring requires an additional designed installation space and cannot be directly sleeved on the rotating shaft, but using the compression spring can also achieve the functions that the torsion spring can achieve in the above embodiment.

[0047] In one of the embodiments, as Figure 1 , Figure 5 shown, there is a gap between the two lumbar support members 201. A soft pad 4 is attached to the front ends of the two lumbar support members 201. The soft pad 4 covers both the two lumbar support members 201 and the gap between the two lumbar support members 201. An outer cover 4a that binds the three together is sleeved outside the soft pad 4 and the two lumbar support members 201. The outer cover 4a is made of non-woven fabric or leather. The soft pad 4 makes the lumbar support of the chair softer and more comfortable. When the user sits for a long time, they can feel better support and comfort, reducing the pressure on the waist; the design of the outer cover wraps the lumbar support members 201 together in appearance, and can also increase the overall aesthetics of the seat.

[0048] In another embodiment, there is a gap between the two lumbar support members 201, and a common outer cover 4a is sleeved outside the two lumbar support members 201, making the surfaces of the left lumbar support member 201 and the right lumbar support member 201 appear without interruption; wrapping the two lumbar support members 201 together in appearance increases the overall aesthetics of the seat.

[0049] The above schematically describes the present invention and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present invention, design structures and embodiments similar to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. An ergonomic seat, comprising a seat (1), a backrest (2) and a backrest support (3) for supporting the backrest (2), characterized in that, The backrest (2) is divided into two lumbar and back support members (201) that are symmetrically arranged left and right. The back support (3) has two symmetrically arranged support portions (303) on the left and right. Each lumbar and back support member (201) is rotatably connected to the corresponding support portion (303) through a rotating shaft and forms a fulcrum at the rotating connection. An elastic member for providing a restoring force after the rotation of the lumbar and back support member (201) is provided between the lumbar and back support member (201) and the back support (3); with the fulcrum as the boundary, the lumbar and back support member (201) has an inner area (201a) and an outer area (201b) that are respectively arranged on both sides of the fulcrum; when the inner area (201a) of the backrest (2) is subjected to a backward extrusion force, it rotates backward around the fulcrum, driving the outer area (201b) to rotate towards the middle of the backrest (2), approaching and fitting against the user's lumbar and back.

2. An ergonomic seat according to claim 1, wherein, The lumbar and back support member (201) includes a plate-shaped body (202) and a rotating support (203) integrally formed at the middle position on the back surface of the plate-shaped body (202). The rotating support (203) protrudes from the back surface of the plate-shaped body (202), and the end of the rotating support (203) far from the back surface of the plate-shaped body (202) is rotatably connected to the support portion (303) of the back support (3) through a rotating shaft.

3. The ergonomic seat according to claim 2, characterized in that: A cavity (303a) for inserting the rotating support (203) is provided on the support portion (303). The cavity (303a) has a limiting surface (303b) that limits the outward rotation of the rotating support (203), and a rotating space (303c) for the rotating support (203) to rotate inward is formed in the cavity (303a) from the limiting surface (303b) to the middle direction of the back support (3).

4. The ergonomic seat according to claim 1, characterized in that: The elastic member is a torsion spring sleeved on the rotating shaft.

5. The ergonomic seat according to claim 1, characterized in that: The elastic member is a compression spring provided between the rotating support (203) and the back support (3).

6. The ergonomic seat according to claim 2, characterized in that: A tubular cover (5) is sleeved on the rotating support (203), and the front end of the tubular cover (5) abuts against the back surface position of the plate-shaped body (202).

7. The ergonomic seat according to claim 1, characterized in that: In the left-right direction, the fulcrum is eccentrically arranged so that the width of the inner area (201a) is greater than the width of the outer area (201b).

8. The ergonomic seat according to claim 1, characterized in that: There is a gap between the two lumbar and back support members (201). A soft pad (4) is attached to the front ends of the two lumbar and back support members (201). The soft pad (4) covers both the two lumbar and back support members (201) and the gap between the two lumbar and back support members (201). There is an outer cover that binds the three together between the soft pad (4) and the two lumbar and back support members (201).

9. The ergonomic seat according to claim 1, characterized in that: There is a gap between the two lumbar and back support members (201). An outer cover is sleeved on the two lumbar and back support members (201) together, making the surfaces of the left lumbar and back support member (201) and the right lumbar and back support member (201) appear unpartitioned.

10. The ergonomic seat according to claim 1, characterized in that: The described back support includes a longitudinally arranged column and a T-shaped frame provided at the upper end of the column. The T-shaped frame includes a horizontally arranged crossbar (301) and a longitudinal portion (302) integrally formed below the middle of the crossbar (301). The support portions (303) are formed at both ends of the crossbar (301). A connecting portion for connecting the seat is formed at the lower end of the column. The longitudinal portion (302) is sleeved and fitted with the upper end of the column.

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