A dynamic seat back for a seat

Abstract

The utility model discloses a dynamic chair back of seat, including mounting seat, articulating member and waist support, articulating member is set up in mounting seat, and waist support is through articulating member movable assembly, and articulating member includes first connecting part and the second connecting part of lateral extension, and first connecting part is movably assembled in mounting seat, and waist support is equipped with the lateral opening's second installation groove, and the second connecting part is inserted and is formed in this groove and forms front and back limit cooperation, and this cooperation can prevent the second connecting part from separating from the second installation groove, namely, and the waist support is blocked in front and back direction and separates the second connecting part, whole structure is simple, and articulating member only realizes installation and limit function through two connecting parts, and both complete the dynamic assembly of waist support, and guarantee the connection stability.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a dynamic backrest for a seat. Background Technology

[0002] In seat back design, multi-dimensional motion functions of lumbar support are gradually becoming a core requirement to adapt to changes in human sitting posture and relieve lumbar pressure. However, existing dynamic backrests of seats with this function mostly rely on complex structures to achieve multi-directional adjustment of the lumbar support: some solutions use multiple sets of motion mechanisms connected in series to control the forward and backward, up and down, or angle adjustment of the lumbar support, resulting in an increase in the overall size of the seat back, complicated assembly processes, and increased production costs.

[0003] Currently, there is a lack of a design in the market that can achieve multi-dimensional movement of the lumbar support through a simple structure. When manufacturers want to use a single simple component to dynamically set the lumbar support onto the backrest, they often need to set a limiting component on the lumbar support or backrest to prevent the component from falling off. Although this simplifies the adjustment structure to a certain extent, it cannot simplify the matching limiting structure, resulting in redundant and complicated process steps in the production and assembly of the chair. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a dynamic seat back, including a mounting base, a joint, and a lumbar support. The joint is movably mounted on the mounting base, and the lumbar support is movably assembled via the joint. The joint includes a first connecting portion and a laterally extending second connecting portion. The first connecting portion is movably mounted in the mounting base, and the lumbar support has a laterally open second mounting groove. The second connecting portion is inserted into this groove and forms a front-rear limiting fit, which prevents the second connecting portion from detaching from the second mounting groove. In other words, the lumbar support prevents the second connecting portion from detaching in the front-rear direction. The overall structure is simple, and the joint achieves the installation and limiting functions through only two connecting portions, thus completing the dynamic assembly of the lumbar support while ensuring connection stability.

[0005] The technical solution of this utility model is implemented as follows: A dynamic backrest for a seat includes a mounting base, on which a joint is movably mounted. The joint is connected to a lumbar support member, which is movably mounted on the mounting base via the joint. The joint includes a first connecting portion and a second connecting portion extending laterally from the first connecting portion. The first connecting portion is movably mounted in the mounting base. The lumbar support member has a second mounting groove with a lateral opening. The second connecting portion is inserted into the second mounting groove and engages with the second mounting groove in a front-to-back limiting manner.

[0006] The lumbar support is dynamically mounted on the mounting base via a joint. This dynamic component has only a first connecting part and a second connecting part, making its structure simple. During installation, the first connecting part connects to the mounting base, and the second connecting part connects to the lumbar support. Since the second connecting part protrudes laterally from the first connecting part, it not only serves as a connector but also acts as a limiter along with the laterally open second mounting groove. The front and rear limiting fit does not only refer to the second connecting part being in contact with the front and rear walls of the second mounting groove for limitation, but also means that the second mounting groove will not cause the second connecting part to detach in the front and rear directions, thus preventing the lumbar support from detaching from the second connecting part. That is, when the second connecting part is in the second mounting groove, the lumbar support will prevent the second connecting part from leaving the second mounting groove in the front and rear directions.

[0007] Preferably, there are two mounting seats, arranged spaced apart left and right. Each mounting seat is equipped with the aforementioned joint, and the mounting seat provides lateral restraint to the joint. The left and right ends of the waist support member are each provided with the second mounting groove, and the second connecting portions of the two joints are respectively disposed in the corresponding second mounting grooves. The two joints are configured to laterally connect to the waist support member, and are restrained in the lateral direction by the mounting seats to prevent the waist support member from detaching. The two joints clamp the waist support member like clips. Similarly, when the mounting seats provide lateral restraint to the joints, there may be a lateral gap between the mounting seats and the joints, but this gap is definitely less than the length of the second connecting portion entering the second mounting groove. When there is no lateral gap between the mounting seats and the joints, although the second connecting portion will not detach from the second mounting groove, it will increase the resistance to movement of the joint on the mounting seats.

[0008] Preferably, when the joint is installed on the mounting base, there is a lateral gap between the joint and the mounting base, which is less than the length of the second connecting part entering the second mounting groove. This ensures that the waist support will not detach from the joint after installation.

[0009] Preferably, the waist support is a frame structure, including vertical bars on the left and right sides, with a second mounting groove formed on the inner or outer surface of the vertical bars. The second mounting groove is only laterally open, and when the second connecting part is located in the second mounting groove, both the front and rear directions of the second connecting part are blocked by the waist support. The opening direction of the second mounting groove can be selected according to actual needs, but the second mounting groove must be laterally open to cooperate with the joint to achieve front and rear limiting.

[0010] Preferably, in the vertical direction, there is a vertical movement space between the second connecting part and the second mounting groove, so that the waist support and the joint can move relative to each other in the vertical direction.

[0011] Preferably, the first connecting part is arranged in the front-to-back direction, the second connecting part is arranged in the left-to-right direction, the mounting base is provided with a first mounting groove, the first mounting groove opens forward, the first connecting part is installed in the first mounting groove, and the second connecting part protrudes outside the first mounting groove.

[0012] Preferably, there is a front-to-back movement space between the rear of the first connecting part and the first mounting groove, and a rotational movement space between the first connecting part and the first mounting groove in the vertical direction, and the joint is disposed in the first mounting groove in a way that allows it to move back and forth and rotate up and down.

[0013] Preferably, the rear end of the first connecting part has a protruding mounting post, and a spring is mounted on the mounting post. The spring is located in the front-to-back movement space and provides a forward elastic force to the first connecting part. The rear end face of the mounting base has a clearance hole, in which a bolt is installed from back to front, and the bolt is connected to the first connecting part in the first mounting groove. The spring is also sleeved on the bolt. The vertical dimension of the clearance hole is larger than the diameter of the bolt. The bolt and the spring move together when the joint moves back and forth and rotates, thereby acting on the movement of the joint, such as elastic reset during front-to-back movement or elastic reset during rotation.

[0014] Preferably, the joint is L-shaped, with the second connecting part located at the front end of the first connecting part. The joint can also be T-shaped, but the L-shaped joint has lower mold costs and a simpler structure.

[0015] Preferably, it also includes a back support, which has a support base arranged horizontally on the left and right sides, and a mounting base is disposed on the support base.

[0016] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows: The lumbar support is dynamically mounted on the mounting base via a joint. This dynamic component has only a first connecting part and a second connecting part, making its structure simple. During installation, the first connecting part connects to the mounting base, and the second connecting part connects to the lumbar support. Since the second connecting part protrudes laterally from the first connecting part, it not only serves as a connector but also acts as a limiter along with the laterally open second mounting groove. The front and rear limiting fit does not only refer to the second connecting part being in contact with the front and rear walls of the second mounting groove for limitation, but also means that the second mounting groove will not cause the second connecting part to detach in the front and rear directions, thus preventing the lumbar support from detaching from the second connecting part. That is, when the second connecting part is in the second mounting groove, the lumbar support will prevent the second connecting part from leaving the second mounting groove in the front and rear directions. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the chair back in this embodiment of the present invention; Figure 2This is a rear view of the dynamic chair back in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the dynamic chair back in an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the back frame in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the waist support member in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the joint component in an embodiment of the present invention; Figure 7 This is an exploded view of the dynamic chair back in an embodiment of the present invention; Figure 8 This is a front view of the back frame in an embodiment of the present invention; Figure 9 This is a cross-sectional view of the first connecting part and the first mounting groove being left and right limited, and the second connecting part and the second mounting groove being front and rear limited in an embodiment of the present invention.

[0018] The reference numerals in the attached drawings are as follows: back frame 1; waist support 2; joint 3; first connecting part 31; second connecting part 32; mounting post 33; first mounting groove 4; second mounting groove 5; vertical rod 10; upright rod 11; support base 12; mounting base 121; slot 13; elastic ball 14; spring 15; clearance hole 17. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0021] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] The specific implementation of this utility model is as follows: like Figure 1-9As shown, this utility model provides a dynamic backrest for a seat, including a support member and a lumbar support member 2. A joint member 3 is provided between the lumbar support member 2 and the support member. The lumbar support member 2 is movably mounted on the support member through the joint member 3, and the lumbar support member 2 can move along the support member in multiple directions. The support member is provided with a first mounting groove 4, and the lumbar support member 2 is provided with a second mounting groove 5. The two ends of the joint member 3 are respectively installed in the first mounting groove 4 and the second mounting groove 5, and there is a movable space between the joint member 3 and the first mounting groove 4 and the second mounting groove 5. The movable space is configured to allow the joint member 3 to be movably mounted in the first mounting groove 4 and the second mounting groove 5.

[0023] The lumbar support 2 moves relative to the support through the movement between the joint 3 and the lumbar support 2 and the support. Since the joint 3 has movable space between itself and the first mounting groove 4 and the second mounting groove 5, the joint 3 has at least one direction of movement relative to both the lumbar support 2 and the support. That is, the lumbar support 2 has at least one direction of movement relative to the joint 3, and the joint 3 has at least one direction of movement relative to the support, so that the lumbar support 2 has at least two directions of movement relative to the support, thereby realizing the multi-dimensional movement of the lumbar support 2.

[0024] Specifically, such as Figure 1 , 2 As shown, the lumbar support 2 is used to support the human waist. In addition, there are components that support the human back. The support can be a back bracket, and a backrest or back frame is set on it to support the back. In this embodiment, the support is a back frame 1, and the lumbar support 2 is located in the back frame 1. The lumbar support 2 is also a frame structure. The two frame structures are connected by joints 3. There can be one or more joints 3. In this embodiment, there are two joints 3, located at the left and right ends of the lumbar support 2 respectively. Correspondingly, there are also two first mounting slots 4 and two second mounting slots 5. Since the lumbar support 2 is a frame structure, it includes vertical rods 10 located on the left and right sides. The second mounting slots 5 are opened on the vertical rods 10, and the joints 3 are set therein.

[0025] Furthermore, such as Figure 3 , 7As shown, in this embodiment, the multi-directional movement of the waist support 2 includes forward and backward, up and down, and rotational movements, all of which are achieved through the joint 3. There are three movable spaces between the joint 3 and the first mounting groove 4 and the second mounting groove 5, and each of the three movable spaces allows the joint 3 to move in different directions. There are two movable spaces between the joint 3 and the first mounting groove 4 or two movable spaces between the joint 3 and the second mounting groove 5. In this embodiment, the joint 3 has two movable spaces between the joint 3 and the first mounting groove 4, and only one movable space between the joint 3 and the second mounting groove 5. Of course, it is also possible to form two movable spaces between the joint 3 and the second mounting groove 5.

[0026] The three movable spaces are the forward and backward movement space, the up and down movement space, and the rotational movement space. The up and down movement space and the rotational movement space are formed in the up and down direction of the joint 3, and the forward and backward movement space is formed in the forward and backward direction of the joint 3. For the up and down movement space, there is space to avoid movement between the joint 3 and the mounting slot in both the up and down directions. For the rotational movement space, there is only space to avoid movement above or below, or there is space in both the up and down directions. For the forward and backward movement space, there can also be space to avoid movement only in front of or behind the joint 3. Through the above-mentioned structural settings of the connection positions, the lumbar support 2 can move forward and backward, up and down, and rotate on the back frame 1, so that the user can adjust it as needed, improving applicability and comfort. The multi-dimensional movement of the lumbar support 2 can be achieved by simply setting up the joint 3 and its connection positions, which greatly simplifies the structure and saves production costs.

[0027] Furthermore, such as Figure 2-8As shown, there is a vertical movement space between the joint member 3 and the second mounting groove 5, and a front-back movement space and a rotational movement space between the joint member 3 and the first mounting groove 4. That is, the waist support member 2 can move vertically relative to the joint member 3 (after the joint member 3 is set on the back frame 1, the vertical movement of the joint member 3 is restricted), and the joint member 3 can move back and forth and rotate relative to the back frame 1, thereby driving the waist support member 2 to move back and forth and rotate relative to the back frame 1. Structurally, the second mounting groove 5 has several slots 13 along the vertical direction on its groove wall, and the joint member 3 has a locking member that cooperates with the slots 13. The locking member is an elastic ball 14. The front-back movement space is formed between the rear inner wall of the joint member 3 and the first mounting groove 4, and a spring 15 is provided in the front-back movement space. The rotational movement space is formed between the upper and lower sides of the joint member 3 and the first mounting groove 4. There is a gap between the side walls, i.e., between the joint 3 and the first mounting groove 4 in the vertical direction. The rotation of the lumbar support 2 is achieved by the movement of the joint 3 in the gap. The spring 15 always provides a forward elastic force to the joint 3 so that the lumbar support 2 moves forward. When the waist of the human body leans down, the lumbar support 2 can adaptively move backward. In addition, the joint 3 is set on the back frame 1 by bolts. The bolts are inserted into the spring 15 and are slidably set on the back frame 1. After the bolt passes through the back frame 1 and the spring 15, it is connected to the joint 3 in the front and back movement space to prevent the joint 3 from coming out of the first mounting groove 4. Moreover, the clearance hole 17 on the back frame 1 for the bolt is larger than the diameter of the bolt in the vertical direction, so that the bolt can swing up and down. When the lumbar support 2 rotates, the joint 3 swings in the first mounting groove 4, and at the same time, it will also drive the bolt to swing up and down.

[0028] More specifically, the second mounting groove 5 is opened on the inner side of the vertical rod 10 and the opening of the second mounting groove 5 faces inward; the back frame 1 includes left and right uprights 11, and a support seat 12 arranged horizontally between the two uprights 11 is provided. The first mounting groove 4 is opened on the support seat 12 and the opening of the first mounting groove 4 faces forward; in this embodiment, the back frame 1 is not a traditional complete four-sided frame, its lower end is open, and the support seat 12 is located in the middle and lower part of the uprights 11 to correspond to the position of the waist support member 2; the joint member 3 is L-shaped so that it can be inserted into the first mounting groove 4 and the second mounting groove 5 at the same time; the clearance hole 17 is provided on the support seat 12 and the opening faces backward, and the clearance hole 17 communicates with the first mounting groove 4.

[0029] In addition, the second mounting groove 5 can also be opened on the outer side of the vertical rod 10 with the opening of the second mounting groove 5 facing outward; the first mounting groove 4 is correspondingly opened on the inner side of the vertical rod 11 with the opening facing inward, and the joint 3 can be straight rod or block.

[0030] During installation, the L-shaped joint 3 is inserted into the first mounting groove 4 and the second mounting groove 5 from two directions. Specifically, the two joints 3 are first inserted into the second mounting groove 5 of the waist support 2 in the left-right direction, so that the elastic ball 14 engages with the groove 13. Then, the waist support 2 and the two joints 3 are moved together, so that the other end of the joint 3 is inserted into the first mounting groove 4 from front to back. During this process, a spring 15 is sleeved on the cylindrical tail of the joint 3, so that the spring 15 enters the front-back movement space. Finally, a bolt is inserted from the clearance hole 17 to connect the joint 3, restricting the joint 3 in the first mounting groove 4 and preventing it from moving left or right. Due to the L-shaped structure of the joint 3, the waist support 2 is also restricted by the joint 3, so that the waist support 2 cannot fall off.

[0031] Furthermore, such as Figure 7 , 9 As shown, two mounting seats 121 spaced apart are provided on the support base 12. The first mounting groove 4 is opened on the mounting seat 121. There are also two joint members 3, which are respectively set into the corresponding mounting seats 121. The two joint members 3 clamp the waist support member 2 like a clamp. The joint member 3 includes a first connecting part 31 and a second connecting part 32 extending laterally from the first connecting part 31. The second mounting groove 5 is laterally opened corresponding to the second connecting part 32, so that the first connecting part 31 is inserted into the first mounting groove 4 from front to back, and the second connecting part 32 is inserted into the second mounting groove 5 from left to right. During installation, the second connecting part 32 and the second mounting groove 5 are assembled first. After the second connecting part 32 is inserted into the second mounting groove 5, the two achieve a front-to-back limiting fit.

[0032] The lumbar support 2 is dynamically mounted on the mounting base 121 via the joint 3. This dynamic component has only a first connecting part 31 and a second connecting part 32, and has a simple structure. During installation, the first connecting part 31 is connected to the mounting base 121, and the second connecting part 32 is connected to the lumbar support 2. Since the second connecting part 32 protrudes laterally from the first connecting part 31, the second connecting part 32 not only serves as a connection but also acts as a limiting element together with the laterally open second mounting groove 5. The front and rear limiting cooperation does not only refer to the second connecting part 32 being in contact with the front and rear groove walls of the second mounting groove 5 for limiting, but also means that the second mounting groove 5 will not cause the second connecting part 32 to detach in the front and rear directions, so as to prevent the lumbar support 2 from detaching from the second connecting part 32. That is, when the second connecting part 32 is in the second mounting groove 5, the lumbar support 2 will prevent the second connecting part 32 from leaving the second mounting groove 5 in the front and rear directions.

[0033] Mounting base 121 provides left and right direction limit for joint member 3; when joint member 3 is installed on mounting base 121, there is a left and right direction gap between joint member 3 and mounting base 121, which is less than the length of the second connecting part 32 entering the second mounting groove 5, so as to ensure that the waist support member 2 will not detach from joint member 3 after installation; when there is no left and right gap between mounting base 121 and joint member 3, although the second connecting part 32 will not detach from the second mounting groove 5, the installation will increase the movement resistance of joint member 3 on mounting base 121.

[0034] The waist support member 2 is provided with the second mounting groove 5 at both ends. The second mounting groove 5 can be located on the inner or outer side of the vertical rod 10. The opening direction can be selected according to the actual situation. However, the second mounting groove 5 must be opened laterally in order to cooperate with the joint member 3 to achieve front and rear limit. The second connecting part 32 of the two joint members 3 is respectively located in the corresponding second mounting groove 5. The two joint members 3 are configured to be laterally connected to the waist support member 2 and are limited by the left and right direction of the mounting seat 121 to prevent the waist support member 2 from detaching.

[0035] The rear end of the first connecting part 31 is provided with a mounting post 33, and the spring 15 is sleeved on the mounting post 33. The bolt is installed from back to front into the clearance hole 17 and the bolt is connected to the first connecting part 31 in the first mounting groove 4. The spring 15 is also sleeved on the bolt.

Claims

1. A dynamic seat back for a seat, characterized by: The device includes a mounting base, on which a joint is movably mounted. The joint is connected to a lumbar support member, which is movably mounted on the mounting base via the joint. The joint includes a first connecting portion and a second connecting portion extending laterally from the first connecting portion. The first connecting portion is movably mounted in the mounting base. The lumbar support member has a second mounting groove with a lateral opening. The second connecting portion is inserted into the second mounting groove and engages with the second mounting groove in a front-to-back limiting manner.

2. A dynamic seat back for a seat as claimed in claim 1, characterized in that: There are two mounting bases, which are arranged at an interval from left to right. Each mounting base is equipped with the aforementioned joint, and the mounting base provides left and right direction limitation for the joint. The left and right ends of the waist support are provided with the second mounting groove, and the second connecting parts of the two joints are respectively set in the corresponding second mounting groove. The two joints are configured to be laterally connected to the waist support and are limited by the left and right direction of the mounting base to prevent the waist support from detaching.

3. A dynamic seat back for a seat as claimed in claim 2, characterised in that: When the joint is installed on the mounting base, there is a left-right gap between the joint and the mounting base, which is less than the length of the second connecting part entering the second mounting groove.

4. A dynamic seat back for a seat as claimed in claim 2, characterized in that: The waist support is a frame structure, including vertical bars on the left and right sides. The second mounting groove is opened on the inner or outer side of the vertical bar. The second mounting groove is only open laterally. When the second connecting part is located in the second mounting groove, the front and rear directions of the second connecting part are blocked by the waist support.

5. A dynamic seat back for a seat as defined in claim 2, characterized by: In the vertical direction, there is a vertical movement space between the second connecting part and the second mounting groove, so that the waist support and the joint can move relative to each other in the vertical direction.

6. The dynamic seat back of claim 1, wherein: The first connecting part is arranged in the front-to-back direction, the second connecting part is arranged in the left-to-right direction, the mounting base is provided with a first mounting groove, the first mounting groove opens forward, the first connecting part is installed in the first mounting groove, and the second connecting part protrudes outside the first mounting groove.

7. A dynamic seat back for a seat as claimed in claim 6, characterised in that: There is a front-to-back movement space between the rear of the first connecting part and the first mounting groove. In the vertical direction, there is also a rotational movement space between the first connecting part and the first mounting groove. The joint is arranged in the first mounting groove to move back and forth and rotate up and down.

8. A dynamic seat back for a seat as claimed in claim 7, characterised in that: The rear end of the first connecting part is provided with a mounting post, and a spring is provided on the mounting post. The spring is located in the front and rear movement space and provides the first connecting part with a forward elastic force. The rear end face of the mounting base is provided with a clearance hole, and a bolt installed from back to front is provided in the clearance hole. The bolt is connected to the first connecting part in the first mounting groove, and the spring is also sleeved on the bolt. The vertical dimension of the clearance hole is larger than the diameter of the bolt.

9. The dynamic seat back of claim 1, wherein: The joint is L-shaped, and the second connecting part is located at the front end of the first connecting part.

10. The dynamic seat back of claim 1, wherein: It also includes a back support, which has a support base arranged horizontally on the left and right sides, and a mounting base is set on the support base.

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