Locking mechanism for waist support

Abstract

The utility model provides a locking mechanism for waist support, which comprises a base, a motion component and a waist leaning piece, and the motion component is respectively and rotatably connected with the base and the waist leaning piece so as to enable the waist leaning piece to be movably arranged on the base; the motion assembly and the waist leaning piece are selectively locked through a locking part and a locking piece, the locking part is provided with at least one blocking convex part, the locking piece is arranged on the waist leaning piece in a sliding mode and provided with an acting end and a connecting end, and the connecting end is connected with a control piece to control the locking piece to slide; when the locking piece moves towards the locking part and abuts against the blocking convex part at the acting end, the moving assembly is locked, and the waist leaning piece is kept static relative to the base; a gap is formed between the locking part and the waist leaning piece, when the locking piece moves away from the locking part and is located in the gap at the acting end, the movement assembly is unlocked, and the waist leaning piece moves relative to the base through the movement assembly; and compared with a stepless locking scheme, the structure is simple, the cost is lower, and the effects of fitting the waist and tracking the waist for supporting are achieved during unlocking.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a locking mechanism for lumbar support. Background Technology

[0002] As one of the most common pieces of furniture, chairs have become increasingly sophisticated in terms of comfort. For example, traditional chair backs are divided into lumbar supports and backrests to provide targeted support for the back and waist. The lumbar supports also have movement capabilities, allowing them to conform to and support the waist in different postures.

[0003] This type of lumbar support often uses a stepless locking mechanism to balance adjustment and support. It is generally achieved through off-the-shelf devices or independently designed mechanical structures, but both methods have their problems. If stepless locking is achieved through a mechanism, the problems encountered include complex structure, time-consuming design, high mold costs, and additional assembly time during production. If stepless locking is achieved through off-the-shelf devices, such as gas springs, it will increase the cost of the chair and reduce the manufacturer's profits.

[0004] Moreover, continuously locking sports lumbar supports lack floating capability, thus lacking the experience of waist support and cushioning; therefore, continuously locking is not the most suitable adjustment and support method for sports lumbar supports. Summary of the Invention

[0005] To solve the aforementioned technical problems, this utility model provides a locking mechanism for lumbar support, including a base, a motion component, and a lumbar support member. The motion component is rotatably connected to both the base and the lumbar support member, allowing the lumbar support member to be movably mounted on the base. Selective locking is achieved between the motion component and the lumbar support member via a locking part and a locking member. The locking part has at least one blocking protrusion. The locking member is slidably mounted on the lumbar support member and has an action end and a connecting end. The connecting end is connected to a control member to control the sliding of the locking member. When the locking member moves toward the locking part and engages with the blocking protrusion at its action end... When the parts are in contact, the locking motion component is locked, and the lumbar support remains stationary relative to the base. There is a gap between the locking part and the lumbar support. When the locking part moves away from the locking part and is in the gap at the action end, the motion component is unlocked, and the lumbar support moves relative to the base through the motion component. This solution abandons stepless locking, but still has at least one stop formed by the blocking protrusion. Moreover, the locking mechanism has a simpler structure and lower production and assembly costs. When unlocked, the lumbar support has a floating ability, so it moves with the waist, which has the effect of conforming to the waist and supporting the waist, and the comfort is better.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A locking mechanism for lumbar support includes a base, a motion component, and a lumbar support. The lumbar support is mounted on the base via the motion component. One end of the motion component is rotatably connected to the base, and the other end is rotatably connected to the lumbar support. The motion component has a locking part, and a locking member is slidably mounted on the lumbar support. The locking part has at least one blocking protrusion protruding towards the locking member. The locking member has an action end and a connecting end located at both ends. The action end faces the locking part, and the connecting end is connected to a control member configured to control the movement of the locking member toward or away from the locking part. When the locking member moves toward the locking part and abuts against the blocking protrusion at its action end, the motion component is locked, and the lumbar support remains stationary relative to the base. There is a gap between the locking part and the lumbar support. When the locking member moves away from the locking part and its action end is within the gap, the motion component is unlocked, and the lumbar support moves relative to the base via the motion component.

[0008] This solution abandons stepless locking but still has at least one locking position formed by blocking protrusions. With the increase in the number of blocking protrusions, the number of selectable locking positions can be further increased, which can be selected by the manufacturer according to actual requirements, making it more in line with the manufacturer's efficiency. Moreover, this locking mechanism has a simpler structure and lower production and assembly costs, thereby improving efficiency. When locked, the lumbar support remains stationary to fully support the waist. When unlocked, the lumbar support has floating ability, so it moves with the waist, providing a close fit and lumbar support effect, resulting in better comfort.

[0009] Preferably, the lumbar support includes a rotating connection part, a motion component is rotatably connected to the rotating connection part, and a control component and a locking component are both disposed on the rotating connection part.

[0010] Preferably, the lumbar support also includes a support portion for conforming to and supporting the human lumbar region. A rotating connecting portion protrudes rearward from the support portion, a control component is rotatably connected below the rotating connecting portion, and a locking component is vertically positioned above the rotating connecting portion. The support portion supports the human lumbar region, the rotating connecting portion connects the motion components and houses the control component and locking component, and the rotating connecting portion protrudes rearward from the support portion. The two components have clearly defined functions and will not affect the lumbar support provided by the lumbar support; moreover, operating the control component will not affect the lumbar support.

[0011] Preferably, the connecting end is equipped with a head, and the control component has a receiving groove facing downwards. The head is placed in the receiving groove and fixedly connected to the connecting end by screws. The locking component is linked to the control component through the head.

[0012] Preferably, the lumbar support has a rotating groove, and the control component is rotatably disposed in the rotating groove. The rotating groove has a spiral inclined surface, a first stop surface, and a second stop surface. Both the first and second stop surfaces are planar and located at opposite ends of the spiral inclined surface. The first stop surface is closer to the locking portion than the second stop surface. The control component has a lifting protrusion located in the rotating groove and rotating with the control component. The first stop surface is configured such that when the lifting protrusion is located on the first stop surface, the functional end of the locking component abuts against the blocking protrusion. The spiral inclined surface is configured such that when the lifting protrusion slides against the spiral inclined surface, the head and the locking component move up and down. The second stop surface is configured such that when the lifting protrusion is located on the second stop surface, the locking component disengages from the blocking protrusion, and the functional end of the locking component is located in the gap between the locking portion and the lumbar support. The spiral inclined surface is used for the lifting and lowering of the control component. When the control component lifts and lowers, it can move the locking component up and down together, so as to realize the movement of the locking component closer to or away from the locking portion, thereby achieving the switching between locking and unlocking.

[0013] Preferably, a return spring is provided between the lumbar support and the locking member, and the return spring is configured to always provide an upward elastic force to the locking member. Under the action of the return spring, the head is in contact with the end face of the receiving groove. When the control member moves from the second stop surface to the first stop surface, the return spring, in conjunction with the control member, causes the locking member to rise and approach the locking part.

[0014] Preferably, the motion assembly includes a first link and a second link, with the first link located in front of the second link. The rotational connection point of the first link on the base and the rotational connection part is also located in front of the rotation point of the second link. The first link, the second link, the base, and the lumbar support constitute a four-bar linkage, thereby realizing the movement of the lumbar support.

[0015] Preferably, a support spring is provided between the first link and the base, and the support spring provides a forward elastic force to the first link. This same spring provides a forward elastic force to the lumbar support. When unlocked, the lumbar support extends forward under the action of the support spring and provides a supporting elastic force to provide the user with a sense of support or envelopment. It also provides a cushioning sensation when the user's lower back is lowered, resulting in better comfort.

[0016] Preferably, the first link has a rearward-opening movable slot, and the second link is disposed in the movable slot. That is, the second link is nested in the first link, which makes the motion component more integrated.

[0017] Preferably, the locking part is disposed on the first connecting rod, and the locking part includes two blocking protrusions, with a groove formed between the two blocking protrusions. The two blocking protrusions form two positions, one position is achieved by a single blocking protrusion abutting against the actuating end, and the other position is achieved by the actuating end being inserted into the groove.

[0018] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0019] This solution abandons stepless locking but still has at least one locking position formed by blocking protrusions. With the increase in the number of blocking protrusions, the number of selectable locking positions can be further increased, which can be selected by the manufacturer according to actual requirements, making it more in line with the manufacturer's efficiency. Moreover, this locking mechanism has a simpler structure and lower production and assembly costs, thereby improving efficiency. When locked, the lumbar support remains stationary to fully support the waist. When unlocked, the lumbar support has floating ability, so it moves with the waist, providing a close fit and lumbar support effect, resulting in better comfort. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the locking mechanism installed on the backrest in an embodiment of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the locking mechanism in an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the locking mechanism in an embodiment of the present invention;

[0023] Figure 4 This is an exploded view of the locking mechanism in an embodiment of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the base in an embodiment of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the first connecting rod in an embodiment of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the motion component in the embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the lumbar support component in an embodiment of the present invention. Figure 1 ;

[0028] Figure 9 This is a three-dimensional structural diagram of the connection between the locking member and the head in an embodiment of the present invention;

[0029] Figure 10 This is a three-dimensional structural diagram of the control component in the embodiments of this utility model. Figure 1 ;

[0030] Figure 11 This is a schematic diagram of the three-dimensional structure of the lumbar support component in an embodiment of the present invention. Figure 2 ;

[0031] Figure 12 This is a three-dimensional structural diagram of the control component in the embodiments of this utility model. Figure 2 .

[0032] The reference numerals in the attached figures are as follows: base 1; motion component 2; first link 21; second link 22; lumbar support 3; rotating connection 31; support 32; locking part 4; blocking protrusion 41; slot 42; locking element 5; actuating end 51; connecting end 52; columnar body 53; plate-shaped body 54; control element 6; rotating part 61; handle 62; gap 7; backrest 8; movable groove 9; support spring 10; spring seat 11; clearance groove 12; head 13; receiving groove 14; sliding groove 15; return spring 16; rotating groove 17; spiral inclined surface 18; first stop surface 19; second stop surface 20; lifting protrusion 23. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The specific implementation of this utility model is as follows:

[0037] like Figure 1-4As shown, this utility model provides a locking mechanism for lumbar support, including a base 1, a motion component 2, and a lumbar support 3. The lumbar support 3 is mounted on the base 1 via the motion component 2. One end of the motion component 2 is rotatably connected to the base 1, and the other end of the motion component 2 is rotatably connected to the lumbar support 3. The motion component 2 is provided with a locking part 4, and a locking part 5 is slidably mounted on the lumbar support 3. The locking part 4 has at least one blocking protrusion 41 protruding towards the locking part 5. The locking part 5 has an action end 51 and a connecting end 52 located at both ends. 51 faces the locking part 4, and the connecting end 52 is connected to the control member 6. The control member 6 is configured to control the movement of the locking member 5 toward or away from the locking part 4. When the locking member 5 moves toward the locking part 4 and abuts against the blocking protrusion 41 at the actuating end 51, the motion assembly 2 is locked, and the lumbar support member 3 remains stationary relative to the base 1. There is a gap 7 between the locking part 4 and the lumbar support member 3. When the locking member 5 moves away from the locking part 4 and is in the gap 7 at the actuating end 51, the motion assembly 2 is unlocked, and the lumbar support member 3 moves relative to the base 1 through the motion assembly 2.

[0038] This solution abandons stepless locking, but still has at least one position formed by the blocking protrusion 41. With the increase in the number of blocking parts, the number of selectable locking positions can be further increased, which can be selected by the manufacturer according to actual requirements, which is more in line with the manufacturer's efficiency. Moreover, the locking mechanism has a simpler structure and lower production and assembly costs, thereby improving efficiency. When locked, the lumbar support 3 remains stationary to fully support the waist. When unlocked, the lumbar support 3 has a floating ability, so it moves with the waist, which has the effect of conforming to the waist and supporting the waist, resulting in better comfort.

[0039] Specifically, the locking mechanism is applied in a seat. The base 1 is connected to the seat back 8. The lumbar support 3 includes a rotating connecting part 31 and a supporting part 32. The supporting part 32 has a frame structure and a mesh fabric is provided on it. The supporting part 32 is used to fit and support the human waist. The rotating connecting part 31 protrudes backward from the supporting part 32, and the motion component 2 is rotatably connected to the rotating connecting part 31. The control component 6 and the locking component 5 are both provided on the rotating connecting part 31. Further, the control component 6 is rotatably connected below the rotating connecting part 31, the locking component 5 is vertically arranged, and the locking part 4 is located above the rotating connecting part 31. The supporting part 32 is used to support the human waist, and the rotating connecting part 31 is used to connect the motion component 2 and provide the control component 6 and the locking component 5. The rotating connecting part 31 protrudes backward from the supporting part 32. The two have clear division of labor and will not affect the lumbar support 3's support for the human waist. Moreover, operating the control component 6 will not affect the lumbar support.

[0040] In addition, such as Figure 6 , 7As shown, the motion component 2 includes a first link 21 and a second link 22. The first link 21 is located in front of the second link 22. The upper ends of the first link 21 and the second link 22 are rotatably connected to the base 1, and the lower ends of the first link 21 and the second link 22 are rotatably connected to the rotating connection part 31. The rotating connection point of the first link 21 on the base 1 and the rotating connection part 31 is also located in front of the rotating point of the second link 22. The first link 21, the second link 22, the base 1, and the lumbar support 3 constitute a four-bar linkage, thereby realizing the movement of the lumbar support 3. The first link 21 has a rearward open movable groove 9, and the second link 22 is set in the movable groove 9, that is, the second link 22 is nested in the first link 21, making the motion component 2 more integrated.

[0041] The locking part 4 is disposed on the first connecting rod 21. In this embodiment, the locking part 4 includes two blocking protrusions 41, and a groove 42 is formed between the two blocking protrusions 41. The two blocking protrusions 41 form two positions. One position is achieved by a single blocking protrusion 41 abutting against the actuating end 51, and the other position is achieved by the actuating end 51 being inserted into the groove 42.

[0042] like Figure 3-7 As shown, a support spring 10 is provided between the first connecting rod 21 and the base 1. The support spring 10 provides a forward elastic force to the first connecting rod 21. Specifically, the base 1 has a spring seat 11 protruding towards the moving component 2, and the first connecting rod 21 has a spring seat 11 protruding towards the base 1. The second connecting rod 22 has a relief groove 12 that avoids the base 1. The two ends of the support spring 10 are installed on the spring seat 11 of the first connecting rod 21 and the base 1 through the relief groove 12. The support spring 10 provides a forward elastic force to the lumbar support 3. When unlocking, the lumbar support 3 extends forward under the action of the support spring 10 and provides a supporting elastic force to provide the user with a sense of support or wrapping. It also has a cushioning feel when the user's waist leans down, making it more comfortable.

[0043] Furthermore, such as Figure 4 , 8As shown in Figure -10, the locking member 5 includes a columnar body 53 and a plate-shaped body 54. A sliding groove 15 is provided on the rotating connecting part 31 corresponding to both the columnar body 53 and the plate-shaped body 54. The plate-shaped body 54 is located above the columnar body 53, and its lower part is connected to the upper part of the columnar body 53. The upper end of the plate-shaped body 54 forms the actuating end 51, and the lower end of the columnar body 53 forms the connecting end 52. The actuating end 51 protrudes upward from the rotating connecting part 31, and the connecting end 52 protrudes downward from the rotating connecting part 31. A head 13 is installed on end 52, and a receiving groove 14 is provided facing downward on the control component 6. The head 13 is placed in the receiving groove 14 and is fixedly connected to the connecting end 52 by screws. A return spring 16 is provided in the sliding groove 15 where the plate-shaped body 54 is located. The two ends of the return spring 16 abut against the rotating connecting part 31 and the locking component 5. The return spring 16 always provides an upward elastic force to the locking component 5. Under the action of the return spring 16, the head 13 is in contact with the end face of the receiving groove 14, thereby realizing the linkage between the control component 6 and the locking component 5.

[0044] like Figure 3 , 11As shown in Figure 12, the rotating connecting part 31 has a downwardly opening rotating groove 17. The control component 6 includes a rotating part 61 and a handle 62. The receiving groove 14 is provided on the lower surface of the rotating part 61, and the rotating part 61 is rotatably disposed in the rotating groove 17. The handle 62 protrudes from the rotating part 61 for the user to control the rotation of the rotating part 61. The rotating groove 17 has a spiral inclined surface 18, a first stop surface 19, and a second stop surface 20. The first stop surface 19 and the second stop surface 20 are both planar and located at both ends of the spiral inclined surface 18. The first stop surface 19 is smaller than the second stop surface 20. The stop surface 20 is close to the locking part 4; the rotating part 61 of the control member 6 is provided with a lifting protrusion 23, which is located in the rotating groove 17 and rotates with the rotating part 61. When rotating, the lifting protrusion 23 selectively abuts against the first stop surface 19, the spiral inclined surface 18, and the second stop surface 20, so that the control member 6 can lift and lower at the same time as rotating; the first stop surface 19 is configured such that when the lifting protrusion 23 is located on the first stop surface 19, the actuating end 51 of the locking member 5 abuts against the blocking protrusion 41 or is in the slot 42, and the moving component 2 is in a locked state. The support member 3 remains stationary; the spiral inclined surface 18 is configured such that when the lifting protrusion 23 slides against the spiral inclined surface 18, the head 13 and the locking member 5 move up and down in two directions: when moving from the first stop surface 19 to the second stop surface 20, the control member 6 directly drives the head 13 and the locking member 5 to descend away from the locking part 4; when moving from the second stop surface 20 to the first stop surface 19, the locking member 5 rises to approach the locking part 4 in conjunction with the action of the return spring 16; the second stop surface 20 is configured such that when the lifting protrusion 23 is located at the second stop surface 20, the locking member 5 and the blocking member 5 move up and down. The protrusion 41 disengages from the contact, and the working end 51 of the locking member 5 is located in the gap 7 between the locking part 4 and the waist support member 3; the spiral inclined surface 18 is used to control the lifting and lowering of the control member 6. The user only needs to turn the handle 62 to control the lifting and lowering of the control member 6. When the control member 6 lifts and lowers, it can move the locking member 5 together to achieve the movement of the locking member 5 closer to or further away from the locking part 4, thereby realizing the switching between locking and unlocking; the first stop surface 19 and the second stop surface 20 are used to ensure that the motion component 2 can maintain its current state when it is locked or unlocked and is not operated by the user.

Claims

1. A locking mechanism for lumbar support, characterized in that: The device includes a base, a motion assembly, and a lumbar support. The lumbar support is mounted on the base via the motion assembly. One end of the motion assembly is rotatably connected to the base, and the other end is rotatably connected to the lumbar support. The motion assembly has a locking part, and the lumbar support is slidably mounted on the lumbar support. The locking part has at least one blocking protrusion protruding towards the locking part. The locking part has an action end and a connecting end located at both ends. The action end faces the locking part, and the connecting end is connected to a control element. The control element is configured to control the movement of the locking part toward or away from the locking part. When the locking part moves toward the locking part and abuts against the blocking protrusion at its action end, the motion assembly is locked, and the lumbar support remains stationary relative to the base. There is a gap between the locking part and the lumbar support. When the locking part moves away from the locking part and its action end is within the gap, the motion assembly is unlocked, and the lumbar support moves relative to the base via the motion assembly.

2. The locking mechanism for lumbar support according to claim 1, characterized in that: The lumbar support includes a rotating connection part, a motion component is rotatably connected to the rotating connection part, and control and locking components are both disposed on the rotating connection part.

3. The locking mechanism for lumbar support according to claim 2, characterized in that: The lumbar support also includes a support part for fitting and supporting the human waist, a rotating connection part that protrudes backward from the support part, a control part that is rotatably connected below the rotating connection part, and a locking part that is vertically set with the locking part located above the rotating connection part.

4. The locking mechanism for lumbar support according to claim 1, characterized in that: The connecting end is equipped with a head, and the control component has a receiving groove facing downwards. The head is placed in the receiving groove and is fixedly connected to the connecting end by screws.

5. The locking mechanism for lumbar support according to claim 4, characterized in that: The lumbar support has a rotating groove, and the control component is rotatably mounted in the rotating groove. The rotating groove has a spiral inclined surface, a first stop surface, and a second stop surface. The first stop surface and the second stop surface are both planes and located at the two ends of the spiral inclined surface. The first stop surface is closer to the locking part than the second stop surface. The control component has a lifting protrusion, which is located in the rotating groove and rotates with the control component. The first stop surface is configured such that when the lifting protrusion is located at the first stop surface, the working end of the locking component abuts against the blocking protrusion. The spiral inclined surface is configured such that when the lifting protrusion slides against the spiral inclined surface, the head and the locking component move up and down. The second stop surface is configured such that when the lifting protrusion is located at the second stop surface, the locking component disengages from the blocking protrusion, and the working end of the locking component is located in the gap between the locking part and the lumbar support.

6. The locking mechanism for lumbar support according to claim 4, characterized in that: A return spring is provided between the lumbar support and the locking component, and the return spring is configured to always provide an upward elastic force to the locking component.

7. The locking mechanism for lumbar support according to claim 1, characterized in that: The motion assembly includes a first link and a second link, with the first link located in front of the second link.

8. The locking mechanism for lumbar support according to claim 7, characterized in that: A support spring is provided between the first link and the base, and the support spring provides the first link with a forward elastic force.

9. The locking mechanism for lumbar support according to claim 7, characterized in that: The first link has a rearward-opening movable slot, and the second link is disposed in the movable slot.

10. The locking mechanism for lumbar support according to claim 7, characterized in that: The locking part is disposed on the first link and includes two blocking protrusions, with a groove formed between the two blocking protrusions.

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