An adjustable width headrest and car seat

Abstract

This utility model discloses an adjustable-width headrest and car seat. The headrest is symmetrical about its width center plane. It includes a housing assembly, a locking assembly, and an extension assembly both housed within the housing. The housing assembly forms a first cavity that is expandable and contractible in the width direction. The extension assembly connects to both ends of the first cavity and, under prestress, pushes the first cavity to extend synchronously in both directions. The locking assembly includes unlocking rods that fix the extension assembly at both ends, forming two sets of lever structures. The connection point drives the two ends of the levers to swing synchronously in opposite directions to disengage from the extension assembly. This utility model increases the width of the headrest by symmetrically arranging the extension shells, allowing them to extend synchronously in opposite directions under prestress. The unlocking rods limit the movement distance of the extension shells, thus limiting the width of the headrest at both ends. Passengers can control the movement of the unlocking rods to control the extension of the housing assembly, allowing them to quickly increase the width of both sides of the headrest by the same distance, reducing the difficulty of adjusting the car seat headrest.

Description

Technical Field

[0001] This utility model relates to the field of vehicle seat technology, specifically to an adjustable-width headrest and car seat. Background Technology

[0002] According to GB11550-2009, the minimum usable width of a car seat headrest must be ≥85mm. This requirement applies to all types of headrests to ensure effective head support. Most existing car seat headrests achieve width adjustment through side wing extensions, increasing the range of support for lateral head movement and improving neck protection.

[0003] Chinese patent CN222554796U discloses an adjustable headrest, seat, and vehicle. It uses a sliding mechanism to slide along the length of the adjustable headrest, driving connected side wing panels to slide in the same direction as the sliding mechanism. This allows adjustment of the width at the neck position, improving the lateral support of the headrest and enhancing the user experience. However, adjusting the headrest width requires manually shifting both side wing panels by the same distance, making it difficult to quickly increase the width of both sides of the headrest by the same amount, thus increasing the difficulty of adjusting the car seat headrest. Utility Model Content

[0004] To solve the above problems, this utility model provides an adjustable-width headrest and car seat, the specific technical solution of which is as follows:

[0005] An adjustable-width headrest is disclosed. The headrest is symmetrical about its width center plane and includes a housing assembly, a locking assembly, and an extension assembly, all disposed inside the housing assembly. The housing assembly is curved in an arc along its width direction, and the interior of the housing assembly forms a first cavity that is expandable and contractable in the width direction. The extension assembly is connected to the two ends of the first cavity for expansion and contraction, and the extension assembly can push the first cavity to extend synchronously in both directions along the extension directions of the arc-shaped ends under the action of prestress of the same size but opposite direction. The locking assembly includes unlocking links that fix the extension assembly at both ends, and the unlocking links form a lever structure symmetrical about the width center plane. The middle connection of the lever structure drives the two ends of the lever to swing synchronously in opposite directions to disengage from the extension assembly.

[0006] Furthermore, the locking assembly also includes an adjusting lever whose bottom end contacts the middle connection of the unlocking link. The bottom end of the adjusting lever forms an inclined surface that engages with the middle connection of the unlocking link. When the inclined surface approaches the unlocking link, it can push the middle connection of the unlocking link closer to the extension assembly to swing the two ends of the lever.

[0007] Furthermore, the locking assembly also includes: a fixed block forming a second cavity inside, the bottom end of the adjusting rod intersecting the middle connection of the unlocking link in the second cavity, when the inclined surface of the adjusting rod approaches the unlocking link along the height direction, the middle connection of the unlocking link moves along the thickness direction, and the height direction, thickness direction and width direction are perpendicular to each other; and a first compression spring symmetrically arranged in the second cavity, the length direction of the first compression spring being consistent with the thickness direction, and one end of the first compression spring making lever contact with both ends of the unlocking link to undergo elastic deformation.

[0008] Preferably, the extension assembly includes: an extension shell symmetrically arranged about the center plane of its width, the extension shells being respectively disposed at the telescopic ends of the first cavity, the symmetrically arranged extension shells being able to push the first cavity to move along the extension direction of the arcuate ends, and the interior of each extension shell forming a third cavity; a telescopic member symmetrically disposed about the center plane of its width inside the third cavity, the telescopic member being a compression spring, the telescopic member having the telescopic direction consistent with the width direction, one end of the telescopic member being fixed relative to the housing assembly, and the other end of the telescopic member applying prestress to the extension shell; and a movable slide rail connected to the housing assembly, the length direction of the movable slide rail being the same as the moving direction of the extension shell, the extension shell being able to move away from the first cavity along the movable slide rail.

[0009] Preferably, the swing trajectory of the unlocking link forms a swing surface, and the side of the extension shell perpendicular to the swing surface is called side A. Side A forms at least two limiting grooves along the extension direction of the telescopic member. The limiting grooves can form a separable fixing structure with the two ends of the unlocking link. When the two ends of the unlocking link are fixed with the limiting grooves at different positions, the magnitude of the prestress applied by the telescopic member to the extension shell is different.

[0010] Preferably, the telescopic component includes a hollow conduit connected to the housing assembly. A second compression spring is provided on the side of the hollow conduit. A through hole or blind hole with a guide groove is formed inside the hollow conduit. A telescopic rod connected to the extension shell is provided in the through hole or blind hole. The cross-section of the telescopic rod and the cross-section of the hollow conduit are in concave-convex fit. The telescopic rod can compress the second compression spring when it is embedded in the hollow conduit. The axial direction of the through hole or blind hole of the hollow conduit, the axial direction of the telescopic rod, and the telescopic direction of the second compression spring are all consistent with the moving direction of the extension shell.

[0011] Preferably, the movable slide rail includes: a fixed slide plate connected to the housing assembly, the fixed slide plate forming a sliding connection with a movable slide plate disposed on the extended housing, the cross-sections of the fixed slide plate and the movable slide plate being zig-shaped to form a fit; and a support frame connected to the fixed slide plate, the support frame being disposed in the third cavity to apply a support force to the side of the extended housing, the direction of the support force being perpendicular to the extension and contraction direction of the second compression spring, and the support frame allowing the second compression spring to pass through without interfering with each other.

[0012] Preferably, the housing assembly further includes: a headrest cover fixedly connected to the rotation fulcrum of the unlocking linkage, the headrest cover contacting the passenger's head; a roll-up foam that wraps around the headrest cover, locking assembly, and extension assembly along the width direction, the inner side of the roll-up foam away from the headrest cover forming an open end, and when the first cavity extends along the width direction, the opposite sides of the open ends move in opposite directions; a headrest back plate disposed at the open end of the roll-up foam, the width of the headrest back plate being not less than the maximum distance between the opposite sides of the open ends, the headrest back plate protruding outward in a direction away from the headrest cover, the headrest cover and the headrest back plate having the same curvature and direction; and a folding pillowcase connected at both ends to symmetrical support frames, the folding pillowcase being made of foldable material such as genuine leather or fabric, the folding pillowcase being disposed on the side of the roll-up foam and extending and retracting simultaneously with the roll-up foam, the folding pillowcase moving relative to the side of the roll-up foam during the extension and retraction process.

[0013] Preferably, the length of the folded pillowcase is greater than the length of the rolled-up foam.

[0014] Preferably, the top and bottom of the extended shell are opposite to the top and bottom of the headrest cover, respectively. The inner sides of the top and bottom of the headrest cover are symmetrically formed with straight slides and bent slides, with the symmetry plane being the width center plane. Two straight slides are formed at one end of the headrest cover, and the length direction of the straight slides is consistent with the length direction of the moving slide rail. The bent slides are respectively set at the end of the straight slides near the extended shell. The bent slides protrude towards the rear plate of the headrest to form a complete sliding track. The extended shell can extend to both ends along the straight slides, and then the extended shell bends towards the headrest cover along the bent slides. The outer surfaces of the extended shell and the headrest cover form concave curved surfaces.

[0015] A car seat, the car seat including the headrest described above.

[0016] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0017] This invention features an extended shell symmetrically arranged about the center plane of the width, allowing it to extend synchronously in opposite directions under prestress, thereby simultaneously increasing the width of both ends of the headrest by the same amount. An unlocking linkage is provided to limit the movement distance of the extended shell, thus limiting the increase in width at both ends of the headrest. Passengers can control the extension state of the shell assembly by controlling the movement of the unlocking linkage, enabling them to quickly increase the width of both sides of the headrest by the same distance, thus reducing the difficulty of adjusting the headrest of a car seat. Attached Figure Description

[0018] Figure 1a This is a schematic diagram of the structure of a headrest embodiment of the present invention.

[0019] Figure 1b This is a schematic diagram of the structure of the headrest in embodiment two of this utility model;

[0020] Figure 2 This is an exploded view of an embodiment of the headrest of this utility model;

[0021] Figure 3 This is a cross-sectional view of an embodiment of the present utility model;

[0022] Figure 4 A cross-sectional view of an embodiment of this utility model. Figure 2 ;

[0023] Figure 5 for Figure 2 Enlarged view of the structure at point A in the image;

[0024] Figure 6 for Figure 2 Enlarged view of the structure at point B in the image;

[0025] Figure 7 This is a schematic diagram of the structure of an embodiment of the movable slide rail;

[0026] Figure 8 for Figure 2 Enlarged view of the structure at point C in the image;

[0027] Figure 9 This is a schematic diagram illustrating the movement of the extension length on one side of the extension component of this utility model;

[0028] Figure 10 Another embodiment of the headrest front cover;

[0029] Figure 11 This is a schematic diagram of another embodiment of the headrest of this utility model;

[0030] Figure 12 for Figure 11 Top view.

[0031] In the diagram: 1. Shell assembly; 11. First cavity; 12. Headrest front cover; 121. Straight slide rail; 122. Bending slide rail; 13. Headrest back panel; 14. Roll-up foam; 15. Folding pillowcase; 2. Locking assembly; 21. Adjusting lever; 22. Unlocking linkage; 23. Fixing block; 24. Second cavity; 25. First compression spring; 3. Extension assembly; 31. Extension shell; 311. Third cavity; 312. Limiting groove; 32. Moving slide rail; 321. Moving slide plate; 322. Fixed slide plate; 323. Support frame; 33. Telescopic component; 331. Hollow guide tube; 332. Second compression spring; 333. Telescopic rod; 4. Width center plane; 5. Side A; 6. Inner side of the shell assembly or inner side of the headrest front cover. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Example 1

[0035] Figure 1a This is a schematic diagram of the unextended state in Example 1. Figure 1b This is a schematic diagram of the extended state in Embodiment 1. Figure 1b The width of the first embodiment is greater than Figure 1a In Embodiment 1, the width is such that the concave side of Embodiment 1 contacts the passenger's head. The X-axis direction is the width direction of Embodiment 1, the Z-axis direction is the height direction of Embodiment 1, and the thickness direction is the Y-axis direction, which is perpendicular to both the X-axis and the Z-axis. Embodiment 1 is an axisymmetric figure, and its symmetry plane is the width center plane 4. The width center plane 4 is perpendicular to the X-axis and parallel to the Z-axis and the Y-axis.

[0036] like Figure 1a , Figure 1b , Figure 2 and Figure 3 As shown, this embodiment is an adjustable-width headrest. The headrest is symmetrical about the width center plane 4. The headrest includes a housing assembly 1, a locking assembly 2, and an extension assembly 3, all disposed inside the housing assembly 1. The housing assembly 1 is curved in an arc shape in the width direction, and the interior of the housing assembly 1 forms a first cavity 11 that is expandable in the width direction. The extension assembly 3 is connected to the two ends of the first cavity 11 for expansion and contraction. The extension assembly 3 can push the first cavity 11 to extend synchronously in both directions along the extension directions of the arc-shaped ends under the action of prestress of the same size but opposite direction. The locking assembly 2 includes an unlocking link 22 that fixes the extension assembly 3 at both ends. The unlocking link 22 forms a lever structure that is symmetrical about the width center plane 4. The middle connection of the lever structure drives the two ends of the lever to swing synchronously in opposite directions to disengage from the extension assembly 3.

[0037] Specifically, the housing assembly 1 is a container for housing the locking assembly 2 and the extension assembly 3. The side of the housing assembly 1 that contacts the passenger's head is a concave curved surface, thereby improving the comfort of the headrest. The interior of the housing assembly 1 forms a first cavity 11 symmetrical about the width center plane 4. The first cavity 11 can extend along the width direction to increase the width of the housing assembly 1, thereby increasing the width of Embodiment 1. Secondly, the extension assembly 3 is a movable assembly, which is symmetrically arranged at both ends of the first cavity 11. There is a prestress between the two extension assemblies 3 with opposite directions and the same magnitude. The direction of the prestress is consistent with the width direction, which can push the two extension assemblies 3 to move in opposite directions and with the same moving distance, thereby pushing the first cavity 11 to extend in both directions and increase its width. The extension assembly 3 moves in both directions along the housing assembly 1, and its moving trajectory is the extension of the two ends of the concave curved surface, that is, a curve. This ensures that after the extension assembly 3 increases the width of the housing assembly 1, the side of the housing assembly 1 that contacts the passenger's head is always a concave curved surface, ensuring the comfort of the headrest.

[0038] Secondly, the locking component 2 is fixedly connected to the middle position of the housing component 1, and is fixedly connected to the inner side of the housing component 1. This inner side is a concave curved surface near the passenger's head, and includes an unlocking link 22 symmetrical about the width center plane 4. The unlocking link 22 forms two sets of symmetrical levers, and the ends of the two sets form a detachable fixing structure with the extension component 3. This fixing structure is specifically a conical protrusion. The left-end conical protrusion forms a slope inclined to the left and a protrusion extending towards the extension component 3. The left-end protrusion can restrict the extension component 3 from extending to the left, and the slope at the left end allows the fixed extension component 3 to move towards the middle position of the housing component 1. Then, the positional relationship between the extension component 3 and the unlocking link 22 is adjusted. The unlocking link 22 has a symmetrical structure, with the right end and the left end having the same structure. The connection position of the two sets of levers is located in the middle of the housing component 1. Both sets of levers can rotate around the housing component 1, and their ends can move relative to the extension component 3. Secondly, the middle position of the unlocking link 22 swings relative to the inner side of the housing component 1, which can drive the two sets of levers to swing in opposite directions at the same time. Then, the ends of the two sets of levers separate from the extension component 3 at the same time, so that the extension components 3 at both ends can move synchronously in opposite directions under the action of prestress, thereby making the first cavity 11 extend synchronously in both directions.

[0039] Among them, the two ends of the unlocking linkage 22 are separated from the extension component 3, so that under the action of prestress, the first cavity 11 is automatically pushed to extend synchronously in both directions, thereby increasing the width of the shell synchronously in both directions, thus rapidly increasing the width of both sides of the headrest, and increasing the same width, thereby increasing the support area of ​​the headrest for the passenger's head, and thus improving its comfort.

[0040] Combination Figure 4As shown, the locking assembly 2 also includes an adjusting pressure rod 21 whose bottom end contacts the middle connection of the unlocking link 22. The bottom end of the adjusting pressure rod 21 forms an inclined surface that cooperates with the middle connection of the unlocking link 22. When the inclined surface approaches the unlocking link 22, the inclined surface can push the middle connection of the unlocking link 22 closer to the extension assembly 3 to swing the two ends of the lever.

[0041] Specifically, the unlocking linkage 22 includes two sets of symmetrical levers. The two sets of levers are connected or flexibly connected to achieve linkage. The bottom end of the adjusting lever 21 acts on the flexibly connected position to drive the two sets of levers to swing. There is a gap between the two sets of levers at the connection position or in the middle to allow the two ends of the two sets of levers to have room to swing without interference. The inclined surface at the bottom end of the adjusting lever 21 can act on the two ends of the two sets of levers simultaneously to drive the two sets of levers to swing at the same time.

[0042] Secondly, the length direction of the adjusting lever 21 is consistent with the Z-axis direction. Figure 4 To adjust the longitudinal section of the pressure rod 21 about the width center plane 4, its bottom end forms a downward sloping surface, and the sloping surface contacts the middle connection of the unlocking link 22. As the adjusting pressure rod 21 approaches the unlocking link 22 along the Z-axis, the sloping surface applies a downward pressure to the middle connection of the unlocking link 22. The component of this pressure pushes the middle connection of the unlocking link 22 closer to the inner side of the housing assembly 1, thereby causing the two sets of levers to swing synchronously relative to the inner side of the housing assembly 1. Figure 3 The arrow in the figure indicates the direction of movement at the middle connection of the unlocking linkage 22. The lever at the left end rotates clockwise and the lever at the right end rotates counterclockwise, causing both to move away from the end of the adjusting pressure rod 21 and separate from the extension assembly 3. This allows the extension assembly 3 to push the first cavity 11 to extend synchronously in both directions under the action of prestress, thereby increasing the width of both sides of the shell.

[0043] Furthermore, the locking assembly 2 also includes: a fixing block 23 forming a second cavity 24 inside; the bottom end of the adjusting rod 21 intersects with the middle connection of the unlocking link 22 in the second cavity 24; when the inclined surface of the adjusting rod 21 approaches the unlocking link 22 along the height direction, the middle connection of the unlocking link 22 moves along the thickness direction, and the height direction, thickness direction and width direction are perpendicular to each other; and a first compression spring 25 symmetrically arranged in the second cavity 24; the length direction of the first compression spring 25 is consistent with the thickness direction; one end of the first compression spring 25 makes lever contact with both ends of the unlocking link 22 to undergo elastic deformation.

[0044] Specifically, the fixing block 23 is fixedly connected to the inner side of the housing assembly 1, forming a cavity inside. Its side wall has a through hole 1 along the X-axis and a through hole 2 along the Z-axis, so that the bottom end of the adjusting rod 21 passes through the through hole 2 and applies a downward pressure to the unlocking link 22. This pressure has a component force along the thickness direction, so that the bottom end of the adjusting rod 21 can drive the middle connection of the unlocking link 22 to swing. This causes both sets of levers of the unlocking link 22 to swing relative to the inner side of the housing assembly 1 through the through hole 1, and then its end separates from the extension assembly 3, increasing the width of both sides of the housing.

[0045] Secondly, the two sets of levers are connected to one end of the first compression spring 25 at the non-intermediate connection points in the second cavity 24. The other end of the first compression spring 25 is connected to the housing assembly 1. The first compression spring 25 is located between the bottom inclined surface of the adjusting rod 21 and the inner side of the housing assembly 1. When the bottom inclined surface pushes the middle connection point of the unlocking link 22 close to the inner side of the housing assembly 1, the two sets of levers at the non-intermediate connection points in the second cavity 24 can compress the first compression spring 25 respectively, and the compression amount is the same. Then, when the bottom inclined surface of the adjusting rod 21 moves away from the unlocking link 22, the first compression spring 25 restores its deformation, and then pushes the middle connection point of the unlocking link 22 to automatically reset. Then, the ends of the two sets of levers automatically fix the extension components 3 at both ends to fix their position relative to the housing assembly 1.

[0046] like Figure 5 and Figure 6 As shown, the extension assembly 3 includes: an extension shell 31 symmetrically arranged about the width center plane 4, the extension shell 31 being respectively disposed at the telescopic ends of the first cavity 11, the symmetrically arranged extension shell 31 being able to push the first cavity 11 to move along the arc-shaped extension directions at both ends, and the interior of each extension shell 31 forming a third cavity 311; a telescopic member 33 symmetrically arranged about the width center plane 4 inside the third cavity 311, the telescopic member 33 being a compression spring, the telescopic direction of the telescopic member 33 being consistent with the width direction, one end of the telescopic member 33 being fixed relative to the housing assembly 1, and the other end of the telescopic member 33 applying prestress to the extension shell 31; and a movable slide rail 32 connected to the housing assembly 1, the length direction of the movable slide rail 32 being the same as the moving direction of the extension shell 31, the extension shell 31 being able to move away from the first cavity 11 along the movable slide rail 32.

[0047] Specifically, the extension shell 31, the telescopic member 33, and the moving slide rail 32 are all symmetrically arranged around the width center plane 4. The interior of the extension shell 31 forms a third cavity 311 with an open end. One end of the telescopic member 33 is fixedly connected to the inner side of the shell assembly 1, and the other end of the telescopic member 33 is fixedly connected to the interior of the extension shell 31. The telescopic direction of the telescopic member 33 is consistent with the moving direction of the extension shell 31. When the extension assembly 3 is not extended, the telescopic member 33 is in a contracted state and applies prestress to the extension shell 31. When the extension shell 31 moves in opposite directions along the width direction, the telescopic member 33 gradually returns to its original position. The prestress does work on the extension shell 31. The outer side of the extension shell 31 coincides with the side wall of the first cavity 11, thereby pushing the first cavity 11 to extend along both ends of the concave curved surface.

[0048] Secondly, the movable slide rail 32 is fixedly connected to the inner side of the housing assembly 1, with its length direction consistent with its width direction. The extension shell 31 moves along the movable slide rail 32 towards both ends of the first cavity 11, so that the extension shell 31 only moves along the width direction during movement, and does not move along the height and thickness directions, ensuring that the housing assembly 1 only increases in width on both sides. A single extension shell 31 can be fixedly connected to multiple movable slide rails 32 to ensure its movement accuracy, improve its structural strength with the housing assembly 1, and extend its service life.

[0049] Furthermore, the swing trajectory of the unlocking link 22 forms a swing surface, and the side of the extension shell 31 perpendicular to the swing surface is side A5. Side A5 forms at least two limiting grooves 312 along the extension direction of the telescopic member 33. The limiting grooves 312 can form a separable fixing structure with the two ends of the unlocking link 22. When the two ends of the unlocking link 22 are fixed with the limiting grooves 312 at different positions, the magnitude of the prestress applied by the telescopic member 33 to the extension shell 31 is different.

[0050] Specifically, the unlocking link 22 swings around the Z-axis, making the swing surface perpendicular to the Z-axis and parallel to the X and Y axes. The side A5 of the extension shell 31 is the inner side, which is perpendicular to the Y-axis and parallel to the Z and X axes. Multiple equally spaced limiting grooves 312 are formed on the side A5 along the X-axis direction. The limiting grooves 312 are through holes that pass through the side A5 and can fix the end of the unlocking link 22. The end of the unlocking link 22 can also swing relative to the side A5, so that it can separate from the limiting grooves 312, thereby forming a separable fixing structure. The two ends of the unlocking link 22 swing synchronously in opposite directions, so that the limiting grooves 312 at both ends separate from the unlocking link 22 at the same time. This allows the prestress at both ends to do positive work on the extension shell 31, so that the first cavity 11 extends synchronously in both directions, increasing the width of both sides of the shell assembly 1.

[0051] Secondly, when the adjusting rod 21 is pressed down, it causes the two ends of the unlocking link 22 to separate from the limiting groove 312. The extension shells 31 at both ends and the limiting grooves 312 move away from each other under the action of prestress. Multiple equally spaced limiting grooves 312 move away from the end of the unlocking link 22 one after another. When the unlocking link 22 is reset and fixed to the limiting groove 312 under the action of the first compression spring 25, the extension shells 31 at both ends are fixed relative to the locking assembly 2, thereby fixing the width of the housing assembly 1 after the change, thereby improving the user experience of Embodiment 1.

[0052] Furthermore, the telescopic component 33 includes a hollow conduit 331 connected to the housing assembly 1. A second compression spring 332 is provided on the side of the hollow conduit 331. A through hole or blind hole with a guide groove is formed inside the hollow conduit 331. A telescopic rod 333 connected to the extension shell 31 is provided in the through hole or blind hole. The cross-section of the telescopic rod 333 and the cross-section of the hollow conduit 331 are concave and convex, and the telescopic rod 333 can compress the second compression spring 332 during the process of embedding the telescopic rod 333 into the hollow conduit 331. The axial direction of the through hole or blind hole of the hollow conduit 331, the axial direction of the telescopic rod 333, and the telescopic direction of the second compression spring 332 are all consistent with the moving direction of the extension shell 31.

[0053] Specifically, one end of the telescopic rod 333 is fixedly connected to the inside of the extension shell 31, and one end of the hollow conduit 331 is fixedly connected to the side of the fixing block 23. This side forms a limiting surface for restricting the second compression spring 332, and a blind hole for placing the telescopic rod 333 is formed axially inside. The axial direction of both is consistent with the moving direction of the extension shell 31. The cross-sections of the telescopic rod 333 and the blind hole are both cross-shaped, and the concave and convex fits of both sides without gaps. This allows the blind hole to restrict the degree of freedom of the telescopic rod 333 to rotate around the axial direction, retaining only its degree of freedom of movement along the axial direction. This allows the telescopic rod 333 to move stably along the blind hole, thereby changing the extension... The total length of the telescopic rod 333 and the blind hole changes the distance between the two ends of the extension shell 31, thereby changing the width of the first cavity 11. The outer side of the hollow guide tube 331 is fitted with a second compression spring 332, one end of which is fixed to one end of the hollow guide tube 331, and the other end face can contact the fixed end of the telescopic rod 333. When the telescopic rod 333 moves close to the hollow guide tube 331, the telescopic rod 333 can compress the second compression spring 332, so that the second compression spring 332 generates elastic force. This elastic force is the prestress on the extension shell 31, which can push the extension shell 31 to move synchronously in both directions, thereby increasing the width of the shell assembly 1.

[0054] like Figure 7As shown, the movable slide rail 32 includes: a fixed slide plate 322 connected to the housing assembly 1, the fixed slide plate 322 and the movable slide plate 321 disposed on the extended housing 31 forming a sliding connection, the cross sections of the fixed slide plate 322 and the movable slide plate 321 are both zig-shaped to form a fit; a support frame 323 connected to the fixed slide plate 322, the support frame 323 is disposed in the third cavity 311 to apply a support force to the side of the extended housing 31, the direction of the support force is perpendicular to the extension and retraction direction of the second compression spring 332, and the support frame 323 allows the second compression spring 332 to pass through without interfering with each other.

[0055] Specifically, the fixed slide plate 322 is fixedly connected to the inner side of the housing assembly 1. The side of the movable slide plate 321 is slidably connected to the side of the fixed slide plate 322 along its length direction. The length directions of the two are consistent, their lengths are the same, and their cross-sections are zigzag. The bent side of the fixed slide plate 322 provides Z-axis support force to the bent side of the movable slide plate 321. The movable slide plate 321 is positioned between the bent side of the fixed slide plate 322 and the inner side of the housing assembly 1, so that the two can restrict the movement of the movable slide plate 321 along the Y-axis, so that the movable slide plate 321 can move stably along the length direction of the fixed slide plate 322, thereby allowing the extended shell 31 to move along the length direction of the fixed slide plate 322 via the movable slide plate 321.

[0056] Secondly, the support frame 323 is fixedly connected to the end of the fixed slide plate 322 near the extension shell 31. The support frame 323 is a rectangular frame, and its side contacts the inner side of the extension shell 31, so that it can apply a support force along the Y-axis to the side of the extension shell 31, thereby increasing the bending moment that the extension shell 31 can withstand, and thus increasing the connection strength between the extension shell 31 and the shell assembly 1, ensuring that the extension shell 31 does not shake when the passenger's head applies pressure to the extended extension shell 31, thus ensuring its performance. Secondly, when the extension shell 31 moves along the support frame 323 and the fixed slide plate 322, the telescopic members 33 all pass through the hollow area of ​​the support frame 323 to apply prestress to the extension shell 31.

[0057] Combination Figure 8 and Figure 9As shown, the housing assembly 1 further includes: a headrest front cover 12 fixedly connected to the rotation fulcrum of the unlocking linkage 22, the headrest front cover 12 contacting the passenger's head; a roll-up foam 14 wrapping around the headrest front cover 12, the locking assembly 2, and the extension assembly 3 along the width direction, the roll-up foam 14 forming an open end on its inner side 6 away from the headrest front cover, and the opposite sides of the open end moving away from each other when the first cavity 11 extends along the width direction; and a headrest back plate 13 disposed at the open end of the roll-up foam 14, the width of the headrest back plate 13 being not less than the opening. The maximum distance between the opposite sides of the headrest, the back panel 13 of the headrest protrudes outward away from the front cover 12 of the headrest, the front cover 12 of the headrest and the back panel 13 of the headrest have the same curvature and the same direction; and the folding pillowcase 15 is connected to the symmetrical support frame 323 at both ends. The folding pillowcase 15 is made of foldable material such as genuine leather or cloth. The folding pillowcase 15 is set on the side of the roll-up foam 14 and moves in extension and retraction at the same time as the roll-up foam 14. During the extension and retraction of the roll-up foam 14, the folding pillowcase 15 moves relative to the side of the roll-up foam 14.

[0058] Specifically, the outer surface of the headrest front cover 12 contacts the passenger's head, and the contact surface is a concave curved surface. The curvature of the surface is designed according to actual needs. The cross-section of the headrest front cover 12 along the width center plane 4 is a wide U-shape. Its inner side parallel to the Z-axis is fixedly connected to the fixed sliding plate 322 and the fixed block 23, respectively. The upper end face perpendicular to the Z-axis forms a through hole through which the adjusting pressure rod 21 passes. The inside of the through hole forms a step to limit the top of the adjusting pressure rod 21, so that the top of the adjusting pressure rod 21 can be fixed on the upper end face of the headrest front cover 12. The top end face is coplanar with the upper end face to improve aesthetics. At the same time, the upper and lower end faces of the headrest front cover 12 perpendicular to the Z-axis are along the Z-axis. The projections overlap and can cover the fixed sliding plate 322 and the fixed block 23 inside; secondly, when the first cavity 11 is not extended, the symmetrically arranged extension shells 31 are all placed inside the headrest front cover 12, so that the Z-axis projection of the headrest front cover 12 can cover the extension shells 31. When the extension shells 31 move away from the fixed sliding plate 322, the extension shells 31 gradually move away from the headrest front cover 12. The length of the fixed sliding plate 322 is the maximum stroke of the extension shells 31. When the extension shells 31 reach the maximum stroke position, the end of them that is close to the headrest front cover 12 is also located inside the headrest front cover 12 and in contact with the support frame 323, ensuring the structural strength after extension.

[0059] Secondly, the side of the headrest back panel 13 parallel to the Z-axis forms an outwardly convex surface that is the same as the concave surface. Both have the same radius of curvature. The outwardly convex surface of the headrest back panel 13 is coplanar with the concave surface of the headrest front cover 12 away from the passenger's head, so that it can close the opening end of the headrest front cover 12, forming an annular shell to hold the fixed slide plate 322, the fixed block 23 and the unlocking linkage 22. Secondly, the upper and lower ends of the headrest back panel 13 form end faces perpendicular to the Z-axis, and the distance between the upper and lower end faces is greater than the distance between the upper and lower end faces of the headrest front cover 12, so that the inner side surfaces of the upper and lower end faces of the headrest back panel 13 can be coplanar with the upper and lower end faces of the headrest front cover 12, thereby allowing the headrest back panel 13 to be fastened to the headrest front cover 12, and the opening ends of the two are arranged opposite each other to form an annular shell.

[0060] Secondly, the retractable foam 14 is made of a flexible material that can be freely rolled up and stretched. It has an elastic coefficient, and in a preferred embodiment, it is an elastic sponge, with a constant total length. The side of the retractable foam 14 parallel to the Z-axis coincides with the concave outer curved surface of the headrest front cover 12 and the outer side of the extension shell 31 parallel to the Z-axis, respectively. The beginning and end ends of the retractable foam 14 are both located between the upper and lower end faces of the headrest back plate 13. When the extension shells 31 at both ends move outwards in opposite directions, the retractable foam 14 located at the concave curved surface of the headrest front cover 12 remains fixed. Its inner side, which contacts the extension shell 31, moves relative to the outer side of the extension shell 31. The beginning and end ends move relative to the headrest back plate 13 and the distance between them increases, but the maximum distance does not exceed the width of the headrest back plate 13. This allows the retractable foam 14 to always wrap around the extension shell 31 during the extension process, without exposing the beginning and end ends, thus improving the aesthetics of the shell assembly 1.

[0061] Figure 9 This is a schematic diagram illustrating the movement of the folded pillowcase 15 and the rolled-up foam 14 as the extension shell 31 at one end of the headrest front cover 12 extends outward.

[0062] Specifically, in a preferred embodiment, the foldable pillowcase 15 is made of foldable, textured genuine leather, which contacts the side of the rolled-up foam 14 parallel to the Z-axis. One end of the folding pillowcase 15 near the headrest front cover 12 is fixedly connected to the concave curved surface of the headrest front cover 12, and the other end is fixedly connected to the support frame 323, so that both ends remain fixed during the movement of the extension shell 31, maintaining their relative position with the headrest front cover 12; secondly, when the extension shell 31 is in the initial unextended position, the folding pillowcase 15 contacts the outer side of the headrest front cover 12, the outer side of the roll-up foam 14, and the inner side of the extension shell 31 from the fixed position. The folding pillowcase 15 forms a U-shape that wraps around the beginning and end of the roll-up foam 14, so that when the extension shell 31 begins to extend, the extension shell 31 drives the roll-up foam 14 to extend, and the roll-up foam 14 drives the folding pillowcase 15 located inside the extension shell 31 to move to the outer side of the roll-up foam 14, always wrapping its outer side, so that the roll-up foam 14 is not exposed, improving the aesthetics of the shell assembly 1.

[0063] Secondly, as the extended shell 31 moves towards each other and returns to its initial unextended position under the action of external force, the support frame 323 moves relative to the inner side of the extended shell 31 and gradually moves to its left or right end, increasing the distance between the support frame 323 and the beginning or end of the roll-up foam 14. This causes the folding pillowcase 15 to gradually retract into the interior of the extended shell 31. The folding pillowcase 15 then causes the roll-up foam 14 to move closely following the outer side of the extended shell 31, thereby causing the roll-up foam 14 located at one end of the outer side of the headrest front cover 12 to grip and roll up, and move towards the headrest back panel 13, causing its beginning and end ends to move towards each other, with the distance gradually decreasing.

[0064] Secondly, the length relationship of the folded pillowcase 15 placed at one end in the extended and unextended states of the extended shell 31 is: L1+L2+L3+L4+L5=L1+L6+L2+L3+L4.

[0065] Where L1 is half the arc length of the contact between the concave curved surface of the folding pillowcase 15 and the front cover of the headrest 12, L2 is the arc length of the contact between the folding pillowcase 15 and the left end face of the roll-up foam 14, L3 is half the arc length of the contact between the folding headrest and the convex curved surface of the headrest back plate 13, L4 is the arc length of the contact between the first or last end of the folding pillowcase 15 and the roll-up foam 14, L5 is the arc length of the contact between the folding pillowcase 15 and the inner side of the extension shell 31, and L6 is the moving length of the extension shell 31, where L5 = L6.

[0066] Furthermore, the total length of the folded pillowcase 15 is greater than the total length of the rolled-up foam 14.

[0067] Specifically, during the extension process of the extension shell 31, the total length of the folded pillowcase 15 at one end is equal to the total length of the roll-up foam 14 at one end plus the maximum moving distance of the extension shell 31 at one end, so that the folded pillowcase 15 can always wrap the roll-up foam 14 inside.

[0068] like Figure 10 , Figure 11 and Figure 12 As shown, in another embodiment, the top and bottom of the extended shell 31 are opposite to the top and bottom of the headrest front cover 12, respectively. The inner sides of the top and bottom of the headrest front cover 12 are symmetrically formed with straight slides 121 and bent slides 122, with the symmetry plane being the width center plane 4. Two straight slides 121 are formed at one end of the headrest front cover 12, and the length direction of the straight slides 121 is consistent with the length direction of the moving slide rail 32. The bent slides 122 are respectively provided at one end of the straight slides 121 near the extended shell 31. The bent slides 122 protrude towards the headrest back plate 13 to form a complete sliding track. The extended shell 31 can extend to both ends along the straight slides 121, and then the extended shell 31 bends towards the headrest front cover 12 along the bent slides 122. The outer surfaces of the extended shell 31 and the headrest front cover 12 form concave curved surfaces.

[0069] In another embodiment, the bottom and top inner surfaces of the headrest front cover 12 are symmetrically formed with straight slides 121 and curved slides 122 about the width center plane 4. Two parallel straight slides 121 are formed, which in turn connect to two curved slides 122. The internal grooves of the straight slides 121 and the curved slides 122 have the same width and can be connected to form a complete slide. Both straight slides 121 are aligned with the length direction of the moving slide rail 32. The arc length of the curved slide 122 closer to the passenger is smaller than that of the curved slide 122 farther from the passenger, but both have the same radius of curvature and center, thus forming concentric arcs. Furthermore, the top and bottom of the extension shell 31 form raised double rows of sliding pillars corresponding to the positions of the straight slides 121. The diameter of these sliding pillars is the same as that of the straight slides 121. The internal grooves of the slide column are of the same width, and the axis of the slide column is perpendicular to the bottom surface of the internal groove of the straight slide rail 121. As the extension shell 31 extends to both ends along the moving slide rail 32, the slide column slides along the side of the straight slide rail 121. When the extension shell 31 completes the extension action to both ends under the action of the second compression spring 332, the passenger can apply a force to the extension shell 31 in the direction of head movement, so that the two rows of slide columns slide along the concentric curved slide rail 122, thereby driving the extension shell 31 to swing relative to the headrest front cover 12. The extension shells 31 at both ends swing at the same time, thereby forming a concave curved surface with the outer side of the headrest front cover 12. This concave curved surface can further constrain the passenger's head to move to the left and right ends, thereby increasing the contact area between the headrest and the head, and thus improving the support effect on the head.

[0070] During the swinging process of the extension shell 31 around the headrest front cover 12, one end of the movable slide plate 321 can swing relative to the fixed slide plate 322, thereby avoiding interference with the swinging process of the extension shell 31.

[0071] Example 2

[0072] Example 2 is a car seat, which includes Example 1. When a passenger needs to increase the width of the headrest on both sides to improve comfort, they only need to press the adjustment lever 21, which in turn drives the unlocking linkage 22 to unlock the extension shells 31 at both ends. The symmetrically arranged extension shells 31 move synchronously in both directions, thereby allowing the width of the headrest to increase quickly on both sides. The adjustment lever 21 can be released to control different widths of the headrest, improving the passenger's user experience.

[0073] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0074] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. An adjustable width headrest, characterized by, The headrest is symmetrical about the width center plane (4), and the headrest includes a housing assembly (1), a locking assembly (2) and an extension assembly (3) both disposed inside the housing assembly (1); The housing assembly (1) is curved in the width direction, and the interior of the housing assembly (1) forms a first cavity (11) that is expandable in the width direction; The extension component (3) is connected to the telescopic ends of the first cavity (11) respectively. The extension component (3) can push the first cavity (11) to extend synchronously in both directions along the arc-shaped extension directions under the action of prestress of the same size but opposite direction. The locking component (2) includes an unlocking link that fixes the extension component (3) at both ends. The unlocking link forms a lever structure that is symmetrical about the width center plane (4). The middle connection of the lever structure drives the two ends of the lever to swing synchronously in opposite directions to disengage from the extension component (3).

2. The headrest of claim 1, wherein: The locking assembly (2) further includes an adjusting pressure rod (21) whose bottom end contacts the middle connection of the unlocking link. The bottom end of the adjusting pressure rod (21) forms an inclined surface that cooperates with the middle connection of the unlocking link. When the inclined surface is close to the unlocking link, the inclined surface can push the middle connection of the unlocking link closer to the extension assembly (3) to swing the two ends of the lever.

3. The headrest of claim 2, wherein: The locking component (2) further includes: A fixed block (23) forming a second cavity (24) is formed inside. The bottom end of the adjusting rod (21) intersects with the middle connection of the unlocking link in the second cavity (24). When the inclined surface of the adjusting rod (21) approaches the unlocking link along the height direction, the middle connection of the unlocking link moves along the thickness direction. The height direction, the thickness direction, and the width direction are perpendicular to each other. A first compression spring (25) is symmetrically arranged in the second cavity (24). The length direction of the first compression spring (25) is consistent with the thickness direction. One end of the first compression spring (25) is in lever contact with both ends of the unlocking linkage to undergo elastic deformation.

4. The headrest of claim 1, wherein: The extension component (3) includes: The extended shells (31) are symmetrically arranged about the width center plane (4). The extended shells (31) are respectively arranged at the two ends of the extension of the first cavity (11). The symmetrically arranged extended shells (31) can push the first cavity (11) to move along the extension direction of the arc ends. The interior of each extended shell (31) forms a third cavity (311). The telescopic member (33) is symmetrically arranged inside the third cavity (311) with respect to the width center plane (4). The telescopic member (33) is a compression spring. The telescopic direction of the telescopic member (33) is consistent with the width direction. One end of the telescopic member (33) is fixed relative to the housing assembly (1), and the other end of the telescopic member (33) applies the prestress to the extension shell (31). The movable slide rail (32) connected to the housing assembly (1) has the same length direction as the moving direction of the extended shell (31), and the extended shell (31) can move in opposite directions along the movable slide rail (32) to extend the first cavity (11).

5. The headrest of claim 4, wherein: The swing trajectory of the unlocking link forms a swing surface. The side of the extension shell (31) perpendicular to the swing surface is side A (5). Side A (5) forms at least two limiting grooves (312) along the extension direction of the telescopic member (33). The limiting grooves (312) can form a separable fixing structure with the two ends of the unlocking link. When the two ends of the unlocking link are fixed with the limiting grooves (312) at different positions, the magnitude of the prestress applied by the telescopic member (33) to the extension shell (31) is different.

6. The headrest of claim 5, wherein: The telescopic member (33) includes a hollow conduit (331) connected to the housing assembly (1). A second compression spring (332) is provided on the side of the hollow conduit (331). A through hole or blind hole with a guide groove is formed inside the hollow conduit (331). A telescopic rod (333) connected to the extension shell (31) is provided in the through hole or blind hole. The cross section of the telescopic rod (333) and the cross section of the hollow conduit (331) are in concave-convex fit. The telescopic rod (333) can compress the second compression spring (332) during the process of embedding the telescopic rod (331). The axial direction of the through hole or blind hole of the hollow conduit (331), the axial direction of the telescopic rod (333), and the telescopic direction of the second compression spring (332) are all consistent with the moving direction of the extension shell (31).

7. The headrest of claim 6, wherein: The movable slide rail (32) includes: A fixed sliding plate (322) is connected to the housing assembly (1), and the fixed sliding plate (322) is slidably connected to a movable sliding plate (321) disposed on the extended shell (31). The cross-sections of the fixed sliding plate (322) and the movable sliding plate (321) are both zig-shaped to form a fit. A support frame (323) connected to the fixed slide plate (322) is disposed in the third cavity (311) to apply a support force to the side of the extension shell (31), the direction of the support force being perpendicular to the extension direction of the second compression spring (332), and the support frame (323) allows the second compression spring (332) to pass through without interfering with each other.

8. The headrest of claim 7, wherein: The housing assembly (1) further includes: A headrest cover (12) is fixedly connected to the rotation fulcrum of the unlocking linkage, and the headrest cover (12) contacts the passenger's head; A roll-up foam (14) wraps around the headrest cover (12), the locking assembly (2) and the extension assembly (3) along the width direction. The roll-up foam (14) forms an open end away from the inner side (6) of the headrest cover. When the first cavity (11) extends along the width direction, the opposite sides of the open end move away from each other. A headrest back panel (13) is provided at the open end of the take-up foam (14), the width of the headrest back panel (13) being not less than the maximum distance between the opposite sides of the open end, the headrest back panel (13) bulging outward away from the headrest front cover (12), the headrest front cover (12) and the headrest back panel (13) having the same curvature and direction; and A folding pillowcase (15) is connected to the symmetrical support frame (323) at both ends. The folding pillowcase (15) is made of foldable material. The folding pillowcase (15) is located on the side of the roll-up foam (14) and moves in extension and retraction at the same time as the roll-up foam (14). During the extension and retraction of the roll-up foam (14), the folding pillowcase (15) moves relative to the side of the roll-up foam (14). The length of the folding pillowcase (15) is greater than the length of the roll-up foam (14).

9. The headrest of claim 8, wherein: The top and bottom of the extended shell (31) are opposite to the top and bottom of the headrest front cover (12), respectively. The inner side of the top and the inner side of the bottom of the headrest front cover (12) are symmetrically formed with straight slide (121) and bent slide (122), and the symmetrical plane is the width center plane (4). Two straight slides (121) are formed at one end of the headrest front cover (12), and the length direction of the straight slides (121) is consistent with the length direction of the moving slide rail (32); The bending slide (122) is respectively disposed at one end of the straight slide (121) near the extension shell (31). The bending slide (122) protrudes towards the headrest back plate (13) to form a complete sliding track. The extension shell (31) can extend to both ends along the straight slide (121). Then the extension shell (31) bends along the bending slide (122) towards the headrest front cover (12). The outer surfaces of the extension shell (31) and the headrest front cover (12) form concave curved surfaces.

10. An automotive seat characterized by comprising: The car seat includes a headrest as described in any one of claims 1 to 9.

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