Positioning locking device and sofa

Abstract

The application relates to a positioning locking device and a sofa. The positioning locking device comprises a limiting part and a rotating part. The limiting part comprises a limiting main body, a positioning piece and a locking groove, and the positioning piece and the locking piece are arranged on the limiting main body. The rotating part comprises a limiting groove and a locking groove, the positioning piece is arranged in the limiting groove and can move in the limiting groove, and the locking piece is arranged in the locking groove to limit the rotation of the rotating part. Based on the above arrangement, the limiting groove on the rotating part can rotate with the rotating part, so that the positioning piece moves in the limiting groove. When the positioning piece contacts two edges of the limiting groove, it is blocked. The rotation range, that is, the angle at which the rotating part can rotate. At the same time, the rotation of the rotating part also drives the rotation of the locking piece, and when the locking piece rotates to the locking groove, the locking piece is clamped with the locking groove, so that the rotating part is locked. At this time, the rotating part cannot rotate. The above arrangement can make the rotation of the rotating part include multiple limited gears.

Description

Technical Field

[0001] This application relates to the field of sofas, and more particularly to a positioning and locking device and a sofa. Background Technology

[0002] A sofa typically consists of a backrest and a seat cushion. The seat cushion provides support and comfort, and its internal filling can be foam, springs, latex, down, etc., covered with fabric or leather. The backrest provides back support and has a similar structure to the seat cushion, also including filling and fabric.

[0003] However, in conventional designs, the headrest and seat cushion are fixed to each other, which cannot meet the user's needs. Utility Model Content

[0004] The purpose of this application is to provide a positioning and locking device and a sofa to address some or all of the shortcomings in the related technology.

[0005] According to a first aspect of the embodiments of this application, a positioning and locking device is provided, the positioning and locking device comprising:

[0006] A limiting part, the limiting part including a limiting body, a positioning element and a locking groove, wherein the positioning element and the locking groove are disposed on the limiting body;

[0007] The rotating part includes a limiting groove and a locking member. The positioning member is disposed in the limiting groove and can move within the limiting groove. The locking member is disposed in the locking groove to restrict the rotation of the rotating part.

[0008] Based on the above configuration, the limiting groove on the rotating part can rotate with the rotating part, allowing the positioning member to move within the limiting groove. When the positioning member contacts both sides of the limiting groove, it will be blocked. This range of rotation is the angle that the rotating part can rotate.

[0009] At the same time, the rotation of the rotating part will also drive the locking part to rotate. When the locking part rotates to the locking groove, the locking part and the locking groove are locked, thereby locking the rotating part. At this time, the rotating part cannot rotate.

[0010] The above settings allow the rotating part to have multiple limited positions, meaning that customers can adjust the position of the headrest according to their actual operating needs, thereby obtaining a more comfortable sitting or lying posture.

[0011] In some alternative embodiments, there are multiple locking slots, which are spaced apart, and the rotation of the rotating part can drive the locking member to switch between the multiple locking slots.

[0012] Based on the above settings, the locking element is switched between multiple locking slots, which means that it can be locked even when the rotating part rotates at different angles, allowing the user to select from multiple positions.

[0013] Of course, multiple locking components can also be set to cooperate with this, so that the locking components can cooperate with the adjacent locking slots when rotating. On this basis, multiple locking components and multiple locking slots can cooperate more tightly to achieve a better locking effect.

[0014] In some alternative embodiments, the locking groove includes a starting groove, and when the locking member is disposed in the starting groove, the positioning member is in contact with the starting edge of the limiting groove;

[0015] The starting groove is gradually increased in size along the rotation direction, and the locking member can be disengaged from the starting groove by rotating along the rotation direction.

[0016] Since the locking element can disengage from the starting slot by rotating in the direction of rotation, it is not necessary to lift the locking element of the headrest and the rotating part connected to it when rotating from the starting area in the direction of rotation, thus allowing the locking element to disengage from the locking slot. This method of adjusting the angle by direct rotation is more in line with user habits and allows for easy operation.

[0017] In some alternative embodiments, the locking groove includes an end groove, and when the locking member is disposed in the end groove, the positioning member is in contact with the end edge of the limiting groove;

[0018] The end groove is gradually increased in the opposite direction of the rotation direction, and the locking member can be disengaged from the end groove by rotating in the opposite direction of the rotation direction.

[0019] Since the locking element can disengage from the starting and ending slots by rotating in the opposite direction of rotation, it is not necessary to lift the headrest and the locking element of the rotating part connected to it when rotating in the opposite direction of rotation from the ending area, thus allowing the locking element to disengage from the locking slot. This method of adjusting the angle simply by rotating is more in line with user habits and allows for easy operation.

[0020] In some alternative embodiments, the locking groove includes an intermediate groove, and when the locking member is disposed in the intermediate groove, the positioning member is not in contact with the edge of the limiting groove;

[0021] The locking element cannot be disengaged from the intermediate groove by rotation.

[0022] Since there is no corresponding limiting groove edge to help limit the movement of the middle groove here, the locking element is designed so that it cannot be disengaged from the middle groove by rotation. That is, after the middle groove is locked, the user cannot rotate the headrest by pushing it directly. This ensures that the headrest will not rotate when the user is leaning against it, providing a good user experience.

[0023] Furthermore, when the user needs to rotate the headrest, they only need to lift the headrest to disengage the locking mechanism from the limiting groove, and rotation will occur. Although this operation requires lifting the headrest compared to natural rotation, this method clearly distinguishes the different operating methods, allowing the user to better differentiate between them.

[0024] In some alternative embodiments, the locking groove is configured to gradually increase in the direction toward the locking member, and the locking member is configured to gradually decrease in the direction toward the locking groove.

[0025] The above describes the specific structural design of the locking groove and locking element. Specifically, the opening of the locking groove gradually decreases inwards from its outward-facing portion. This design facilitates the positioning of the locking element when it engages with it, and the locking element is guided by the wall of the locking groove. Similarly, the side of the locking element facing the locking groove is the smallest part, gradually increasing inwards from there.

[0026] That is, at the beginning of the engagement, the smallest locking part area engages with the largest locking groove area. This allows for better engagement between the two.

[0027] In some alternative embodiments, the limiting part includes a limiting plate, the rotating part includes a rotating plate, the positioning member is disposed on the limiting plate, and the limiting groove is disposed on the rotating plate;

[0028] The positioning and locking device includes an elastic element, which is disposed between the limiting plate and the rotating plate.

[0029] The aforementioned elastic element serves two purposes: firstly, it prevents the limiting plate and the rotating plate from coming into contact, thereby reducing the friction experienced by the rotating part during rotation and making its rotation smoother. Secondly, it can also bear part of the weight of the rotating part and the headrest, making it easier for the user to lift the headrest.

[0030] In some alternative embodiments, the rotating part includes a rotation center, the limiting groove is configured as an arc, and the arc is arranged with the rotation center as the center;

[0031] The rotating part is rotatable so that the limiting groove and the positioning member rotate relative to each other.

[0032] Based on the above settings, since the limiting groove is set to an arc shape, it can match the rotation of the rotating part well, so that the rotating part will not come into contact with the positioning part during rotation, thus allowing the rotation to be smoother and more responsive.

[0033] In some optional embodiments, the limiting groove includes a first end and a second end located at both ends, with the line connecting the first end and the rotation center being a first line, and the line connecting the second end and the rotation center being a second line, wherein the included angle between the first line and the second line is greater than or equal to 10° and less than or equal to 180°.

[0034] Within this range, on the one hand, the rotation of the rotating part can be made practically meaningful, that is, to make the user more comfortable. On the other hand, the headrest will not detach from the seat cushion.

[0035] According to a second aspect of the embodiments of this application, a sofa is provided, the sofa comprising:

[0036] Pillow area;

[0037] Seat cushion section;

[0038] As described in any of the above embodiments, the positioning and locking device has the headrest portion connected to the rotating portion, the headrest portion being rotatably disposed along the limiting portion, and the limiting portion being disposed on the seat cushion portion.

[0039] The beneficial technical effects of the technical solutions provided in this application are:

[0040] The system comprises a limiting part and a rotating part. The limiting part includes a limiting body, a positioning element, and a locking groove, with the positioning element and locking groove disposed on the limiting body. The rotating part includes a limiting groove and a locking element, with the positioning element disposed within the limiting groove and movable within it, and the locking element disposed within the locking groove to restrict the rotation of the rotating part.

[0041] Based on the above configuration, the limiting groove on the rotating part can rotate with the rotating part, allowing the positioning member to move within the limiting groove. When the positioning member contacts both sides of the limiting groove, it will be blocked. This range of rotation is the angle that the rotating part can rotate. Simultaneously, the rotation of the rotating part will also cause the locking member to rotate. When the locking member rotates to the locking groove, it engages with the locking groove, thereby locking the rotating part. At this point, the rotating part cannot rotate.

[0042] The above settings allow the rotating part to have multiple limited positions, meaning that customers can adjust the position of the headrest according to their actual operating needs, thereby obtaining a more comfortable sitting or lying posture.

[0043] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram illustrating a mode of sofa according to an embodiment of this application.

[0046] Figure 2 This is a structural schematic diagram of another mode of sofa according to an embodiment of this application.

[0047] Figure 3 This is a structural schematic diagram of another mode of sofa according to an embodiment of this application.

[0048] Figure 4 This is a schematic diagram of the positioning and locking device according to an embodiment of this application.

[0049] Figure 5 This is a partial structural schematic diagram of a positioning and locking device according to an embodiment of this application.

[0050] Figure 6 This is a partial structural schematic diagram of a positioning and locking device according to an embodiment of this application from another perspective.

[0051] Figure 7 This is a partial structural schematic diagram from another perspective of a positioning and locking device according to an embodiment of this application.

[0052] Figure 8 This is a partial structural schematic diagram from another perspective of a positioning and locking device according to an embodiment of this application.

[0053] Figure 9 The following is a specific structure of the locking groove shown according to an embodiment of this application.

[0054] Explanation of reference numerals in the attached figures

[0055] Sofa 1

[0056] Positioning and locking device 10

[0057] Pillow 20

[0058] Seat cushion 30

[0059] Limiting part 100

[0060] Positioning component 110

[0061] Limiting main body 120

[0062] Locking slot 130

[0063] Starting slot 131

[0064] End slot 132

[0065] Intermediate slot 133

[0066] Limit plate 140

[0067] Rotating part 200

[0068] Limiting groove 210

[0069] First end 211

[0070] Second end 212

[0071] Locking part 220

[0072] Rotation center 230

[0073] Rotating plate 240

[0074] Elastic element 300

[0075] First Line L1

[0076] Second line L2 Detailed Implementation

[0077] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0078] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0079] Sofa 1 generally consists of a backrest 20 and a seat cushion 30. The seat cushion 30 provides support for sitting comfort, and its internal filling can be foam, springs, latex, down, etc., covered with fabric or leather. The backrest 20 provides back support, and its structure is similar to the seat cushion, also including filling and fabric.

[0080] However, in conventional designs, the headrest 20 and the seat cushion 30 are fixed to each other, which cannot meet the user's needs.

[0081] This application discloses a sofa 1, which includes a backrest portion 20, a seat cushion portion 30, and a positioning and locking device 10. The backrest portion 20 is connected to a rotating portion 200, and the backrest portion 20 is rotatably disposed along a limiting portion 100, which is disposed on the seat cushion portion 30. (Reference) Figures 1-3 As shown, Figure 1 , Figure 2 , Figure 3 These are the three modes of this sofa, and this sofa 1 can be switched between the three modes.

[0082] refer to Figures 4-8 As shown, this application proposes a positioning and locking device 10, which includes a limiting part 100 and a rotating part 200.

[0083] The limiting part 100 includes a limiting body 120, a positioning member 110, and a locking groove 130, with the positioning member 110 and the locking groove 130 disposed on the limiting body 120. The rotating part 200 includes a limiting groove 210 and a locking member 220, with the positioning member 110 disposed within the limiting groove 210 and movable within it, and the locking member 220 disposed within the locking groove 130 to restrict the rotation of the rotating part 200.

[0084] Based on the above configuration, the limiting groove 210 on the rotating part 200 can rotate with the rotating part 200, allowing the positioning member 110 to move within the limiting groove 210. When the positioning member 110 contacts both sides of the limiting groove 210, it will be blocked. This range of rotation is the angle that the rotating part 200 can rotate. Simultaneously, the rotation of the rotating part 200 will also cause the locking member 220 to rotate. When the locking member 220 rotates to the locking groove 130, the locking member 220 engages with the locking groove 130, thereby locking the rotating part 200. At this time, the rotating part 200 cannot rotate.

[0085] The above settings allow the rotating part 200 to rotate in multiple limited positions, meaning that customers can adjust the position of the headrest part 20 according to their actual operating needs, thereby obtaining a more comfortable sitting or lying posture.

[0086] Furthermore, the positioning element 110 and the limiting groove 210 can be interchanged. That is, the positioning element 110 is set on the rotating part 200, while the limiting groove 210 is set at the lower fixed plate of the limiting part 100; in this case, the positioning element 110 rotates with the rotating part 200, while the limiting groove 210 remains fixed. This can also limit the range of rotation angle.

[0087] In one embodiment, reference Figures 4-9 As shown, there are multiple locking slots 130, which are spaced apart. The rotating part 200 can rotate to move the locking member 220 between the multiple locking slots 130. The number of multiple locking slots 130 can be 2, 3, 4, 5, 6, etc. As long as the number of locking slots 130 is greater than or equal to two, it is within the protection scope of this application.

[0088] Based on the above settings, the locking member 220 is switched between multiple locking slots 130, which means that the rotating part 200 can be locked even when it rotates at different angles, so that the user can select from multiple positions.

[0089] Of course, multiple locking elements 220 can also be provided to cooperate with this, so that the locking elements 220 cooperate with the adjacent locking grooves 130 when rotating. On this basis, multiple locking elements 220 and multiple locking grooves 130 can cooperate more tightly to achieve a better locking effect.

[0090] In one embodiment, reference Figures 4-9 As shown, the locking groove 130 includes a starting groove 131. When the locking member 220 is disposed in the starting groove 131, the positioning member 110 is in contact with the starting edge of the limiting groove 210. The starting groove 131 is gradually increased in the direction of rotation, and the locking member 220 can be disengaged from the starting groove 131 by rotating in the direction of rotation.

[0091] Based on the above settings, the angle of increase of the starting groove 131 toward the rotation direction can be set to be greater than or equal to 15° and less than or equal to 45°. Within this range, on the one hand, the locking member 220 will not need to rotate a sufficient length to disengage from the starting groove 131 due to an excessively small angle, and on the other hand, the rotating part 200 will not be difficult to rotate due to an excessively large angle. For example, the angle of increase of the starting groove 131 toward the rotation direction can be 15°, 20°, 25°, 30°, 35°, 40°, or 45°.

[0092] Since the locking member 220 can disengage from the starting groove 131 by rotating in the rotational direction, when rotating from the starting area in the rotational direction, it is not necessary to lift the locking member 220 of the headrest part 20 and the rotating part 200 connected to it, thereby allowing the locking member 220 to disengage from the locking groove 130. This method of adjusting the angle by direct rotation is more in line with the user's habits, allowing for easier operation.

[0093] In one embodiment, reference Figures 4-9 As shown, the locking groove 130 includes an ending groove 132. When the locking member 220 is disposed in the ending groove 132, the positioning member 110 is in contact with the ending edge of the limiting groove 210.

[0094] The end groove 132 is gradually increased in the opposite direction of the rotation direction, and the locking member 220 can be disengaged from the end groove 132 by rotating in the opposite direction of the rotation direction.

[0095] Similarly, the angle of increase of the end groove 132 in the opposite direction of rotation can be set to be greater than or equal to 15° and less than or equal to 45°. Within this range, on the one hand, the locking member 220 will not need to rotate a sufficient length to disengage from the end groove 132 due to an angle that is too small, and on the other hand, the rotating part 200 will not be difficult to rotate due to an angle that is too large. For example, the angle of increase of the end groove 132 in the opposite direction of rotation can be 15°, 20°, 25°, 30°, 35°, 40°, or 45°.

[0096] Since the locking member 220 can disengage from the starting and ending groove 132 by rotating in the opposite direction of rotation, when rotating from the ending area in the opposite direction of rotation, it is not necessary to lift the locking member 220 of the headrest part 20 and the rotating part 200 connected to it, thereby allowing the locking member 220 to disengage from the locking groove 130. This method of adjusting the angle by direct rotation is more in line with the user's habits, allowing for easier operation.

[0097] In one embodiment, reference Figures 4-9 As shown, the locking groove 130 includes an intermediate groove 133. When the locking member 220 is disposed in the intermediate groove 133, the positioning member 110 does not contact the edge of the limiting groove 210, and the locking member 220 cannot be disengaged from the intermediate groove 133 by rotation.

[0098] Since there is no corresponding limiting groove 210 edge to help limit the movement of the middle groove here, the locking member 220 is set so that it cannot be disengaged from the middle groove 133 by rotation. That is, after the middle groove 133 is locked, the user cannot make the headrest 20 rotate by pushing it directly. This ensures that the headrest 20 will not rotate when the user is leaning against it, providing the user with a good user experience.

[0099] Furthermore, when the user needs to rotate the headrest 20, they only need to lift the headrest 20 to disengage the locking member 220 from the limiting groove 210, and rotation will occur. Although the above operation requires lifting the headrest 20 compared to natural rotation, this method clearly distinguishes the operation method, allowing the user to better differentiate between them.

[0100] In one embodiment, reference Figures 4-8 As shown, the locking groove 130 is gradually increased in the direction toward the locking member 220, and the locking member 220 is gradually decreased in the direction toward the locking groove 130.

[0101] The above describes the specific structural configuration of the locking groove 130 and the locking member 220. Specifically, the opening of the locking groove 130 gradually decreases in size towards the inside, facilitating the positioning of the locking member 220 when it engages with it, and allowing it to be guided by the wall of the locking groove 130. Similarly, the side of the locking member 220 facing the locking groove 130 is the smallest, gradually increasing in size towards the inside.

[0102] That is, at the beginning of the engagement, the smallest locking element 220 area engages with the largest locking groove 130 area. In this way, the engagement between the two can be achieved more effectively.

[0103] In one embodiment, reference Figures 4-8 As shown, the limiting part 100 includes a limiting plate 140, the rotating part 200 includes a rotating plate 240, the positioning member 110 is disposed on the limiting plate 140, and the limiting groove 210 is disposed on the rotating plate 240. The positioning locking device 10 includes an elastic member 300, which is disposed between the limiting plate 140 and the rotating plate 240. It should be noted that the elastic member 300 here can be a spring, rubber, etc.

[0104] The aforementioned elastic element 300 serves two purposes. First, it prevents the limiting plate 140 and the rotating plate 240 from contacting each other, thereby reducing the friction force experienced by the rotating part 200 during rotation and making the rotation of the rotating part 200 smoother. Second, when the user lifts the headrest part 20 and rotates it to the locking groove 130, the elastic element 300 helps the rotating plate 240 return to its original position downwards, and allows the locking element 220 and the locking groove 130 to engage more tightly, making it less likely for the locking element 220 to jump out of the locking groove 130, thus making the locking more reliable.

[0105] In one embodiment, reference Figures 4-8 As shown, the rotating part 200 includes a rotation center 230, and the limiting groove 210 is arc-shaped, with the arc centered on the rotation center 230. The rotating part 200 can rotate to cause the limiting groove 210 and the positioning member 110 to rotate relative to each other.

[0106] Based on the above settings, since the limiting groove 210 is set to an arc shape, it can match the rotation of the rotating part 200 well, so that the rotating part 200 will not come into contact with the positioning part 110 during rotation, thus allowing it to rotate more smoothly and easily.

[0107] In one embodiment, reference Figure 7 and Figure 8As shown, the limiting groove 210 includes a first end 211 and a second end 212 located at both ends. The line connecting the first end 211 to the rotation center 230 is designated as the first line L1, and the line connecting the second end 212 to the rotation center 230 is designated as the second line L2. If the angle between the first line L1 and the second line L2 is too small, the adjustment limit will be too small, rendering the rotation adjustment meaningless. If the angle between the first line L1 and the second line L2 is too large, the headrest portion 20 will detach from the seat cushion portion 30.

[0108] This application sets the angle between the first line L1 and the second line L2 to be greater than or equal to 10° and less than or equal to 180°. Within this range, on the one hand, the rotation of the rotating part 200 is meaningful, that is, it can make the user more comfortable. On the other hand, the headrest part 20 will not detach from the seat cushion part 30. For example, the angle between the first line L1 and the second line L2 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or 180°.

[0109] In other embodiments, the angle between the first line L1 and the second line L2 can be any angle between 0° and 360°. Rotation can be performed in increments of 3° or 4°.

[0110] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A positioning and locking device, characterized in that, The positioning and locking device includes: A limiting part, the limiting part including a limiting body, a positioning element and a locking groove, wherein the positioning element and the locking groove are disposed on the limiting body; The rotating part includes a limiting groove and a locking member. The positioning member is disposed in the limiting groove and can move within the limiting groove. The locking member is disposed in the locking groove to restrict the rotation of the rotating part.

2. The positioning and locking device as described in claim 1, characterized in that, The number of locking slots is multiple, and the multiple locking slots are arranged at intervals. The rotation of the rotating part can drive the locking member to switch between the multiple locking slots.

3. The positioning and locking device as described in claim 2, characterized in that, The locking groove includes a starting groove. When the locking member is disposed in the starting groove, the positioning member is in contact with the starting edge of the limiting groove. The starting groove is gradually increased in size along the rotation direction, and the locking member can be disengaged from the starting groove by rotating along the rotation direction.

4. The positioning and locking device as described in claim 2, characterized in that, The locking groove includes an end groove. When the locking member is disposed in the end groove, the positioning member is in contact with the end edge of the limiting groove. The end groove is gradually increased in the opposite direction of the rotation direction, and the locking member can be disengaged from the end groove by rotating in the opposite direction of the rotation direction.

5. The positioning and locking device as described in claim 2, characterized in that, The locking groove includes a middle groove. When the locking member is disposed in the middle groove, the positioning member is not in contact with the edge of the limiting groove. The locking element cannot be disengaged from the intermediate groove by rotation.

6. The positioning and locking device as described in claim 1, characterized in that, The locking groove is gradually increased in size in the direction toward the locking member, and the locking member is gradually decreased in size in the direction toward the locking groove.

7. The positioning and locking device as described in claim 1, characterized in that, The limiting part includes a limiting plate, the rotating part includes a rotating plate, the positioning member is disposed on the limiting plate, and the limiting groove is disposed on the rotating plate; The positioning and locking device includes an elastic element, which is disposed between the limiting plate and the rotating plate.

8. The positioning and locking device as described in claim 1, characterized in that, The rotating part includes a rotation center, and the limiting groove is set in an arc shape, with the rotation center as the center of the circle; The rotating part is rotatable so that the limiting groove and the positioning member rotate relative to each other.

9. The positioning and locking device as described in claim 8, characterized in that, The limiting groove includes a first end and a second end located at both ends. The line connecting the first end and the rotation center is called the first line, and the line connecting the second end and the rotation center is called the second line. The included angle between the first line and the second line is greater than or equal to 10° and less than or equal to 180°.

10. A sofa, characterized in that, The sofa includes: Pillow area; Seat cushion section; The positioning and locking device according to any one of claims 1-9, wherein the headrest portion is connected to the rotating portion, the headrest portion is rotatably disposed along the limiting portion, and the limiting portion is disposed on the seat cushion portion.

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