Headrest convenient to adjust and chair applying same

Abstract

The utility model discloses a headrest convenient to adjust and a chair applying the same, the headrest comprises a base frame, a first adjusting arm, a second adjusting arm and a headrest, and the chair further comprises a chair seat and a chair back. The first adjusting arm is pivoted to the base frame, the base frame is fixed to the rear side of the chair back, and the first adjusting arm is located in the middle of the rear side of the chair back, so that the front-back position of the headrest can be adjusted in a large range, and then the second adjusting arm is pivoted to the first adjusting arm, so that the second adjusting arm can further adjust the height of the headrest. And finally, the headrest is pivoted to the second adjusting arm, so that the orientation of the headrest can be conveniently adjusted, through a three-stage adjusting structure, the adjusting range of the headrest can reach the maximum, the flexibility is higher, and the headrest can adapt to a user in the maximum range.

Description

Technical Field

[0001] The utility model relates to the field of headrests, in particular to the field of chairs, and specifically relates to an easily adjustable headrest and a chair using the headrest. Background Art

[0002] The headrest is one of the structures of an ergonomic chair, and its function is to support the user's head. The best supporting position is to make the headrest just support the user's occipital bone. However, due to the different body shapes of users, the headrest needs to be able to adjust its front and back height position to adapt to different users. However, the current ergonomic chairs have a relatively small adjustment range for the position of the headrest. For example, an ergonomic chair disclosed in patent publication number CN115088969A has a headrest pivoted on a rotating frame, and the rotating frame is then pivoted to the top of the chair back. The direction of the headrest is adjusted by rotating the headrest relative to the rotating frame, and the height of the headrest is adjusted by rotating the rotating frame relative to the chair back. However, its adjustment range is limited. When the headrest is at the same height, the front and back positions are fixed, making it difficult to adapt to all users. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to provide an easily adjustable headrest and a chair using the same.

[0004] The technical solution adopted by the utility model to solve the problem is: a headrest that is easy to adjust, comprising:

[0005] Scaffolding;

[0006] A first adjustment arm, the first adjustment arm is pivotally connected to the top of the base frame;

[0007] a second adjusting arm, the second adjusting arm being pivotally connected to the top of the first adjusting arm;

[0008] A headrest, the back side of which is pivotally connected to the front end of the second adjusting arm.

[0009] As a further improvement of the above technical solution, a first positioning structure for fixing the first adjusting arm is provided between the base frame and the first adjusting arm.

[0010] As a further improvement of the above technical solution, a rotating shaft is provided on the base frame, and the first adjusting arm is pivotally connected to the base frame through the rotating shaft;

[0011] The first positioning structure comprises:

[0012] A first ratchet, a first pawl is arranged on the outer periphery of the first ratchet, the first ratchet is fixed on the first adjusting arm, and the axis of the first ratchet is coaxial with the rotation axis of the first adjusting arm, a reset torsion spring is arranged on the first ratchet and fixed on the base frame, a travel groove and a reset groove which are located on the same plane as the first ratchet and are misaligned with the first ratchet are arranged on the outer periphery of the first ratchet, the head ends of the travel groove and the reset groove are connected, the tail ends of the travel groove and the reset groove are connected, and a receiving surface is arranged at the bottom of the reset groove;

[0013] The first pawl is pivotally connected to the base frame, and the first pawl is provided with a first spring that drives the first pawl to swing toward the first ratchet wheel. The front end of the first pawl performs a circular motion along the travel groove and the reset groove. When the first pawl is located in the travel groove, the front end of the first pawl engages with the first ratchet wheel.

[0014] As a further improvement of the above technical solution, a second positioning structure for fixing the second adjusting arm is provided between the first adjusting arm and the second adjusting arm.

[0015] As a further improvement of the above technical solution, a first end surface is provided at the top of the first adjusting arm, and a second end surface abutting against the first end surface is provided at the bottom of the second adjusting arm;

[0016] The second positioning structure comprises:

[0017] Two pairs of opposite locking plates are provided with mutually meshing and annular wave teeth, the two pairs of locking plates are respectively arranged on the first end face and the second end face, the pivot axis of the first adjustment arm and the second adjustment arm is located at the center of the locking plate, and the first end face and / or the second end face have elastic deformation.

[0018] As a further improvement of the above technical solution, a third positioning structure for fixing the headrest is provided between the second adjusting arm and the back of the headrest.

[0019] As a further improvement of the above technical solution, a second shaft body is provided on the top of the second adjustment arm, and a second shaft hole for inserting the second shaft body is provided on the back of the headrest;

[0020] The third positioning structure comprises:

[0021] A positioning ridge disposed on the surface of the second shaft;

[0022] A wave tooth group is arranged in the second shaft hole and cooperates with the positioning convex ridge, and a deformation cavity is arranged on the back of the headrest and is located at the rear side of the wave tooth group.

[0023] As a further improvement of the above technical solution, the first adjusting arm includes two first arms;

[0024] The second adjusting arm comprises a second arm body at the rear side and two second support arms located at both sides of the front end of the second arm body, and the tops of the two first support arms are respectively pivotally connected to both sides of the second arm body;

[0025] Two mounting blocks are arranged on the rear side of the headrest, and two second supporting arms are respectively pivotally connected to the two mounting blocks from the outer sides of the two mounting blocks.

[0026] A chair comprises a seat and a backrest, and uses any one of the above-mentioned easily adjustable headrests, wherein the base frame is fixed to the back side of the seat, and the lower end of the first adjustment arm is located in the middle of the back side of the seat.

[0027] As a further improvement of the above technical solution, a mounting arm is provided in the middle of the back side of the chair, and the base frame is fixed to the top of the mounting arm.

[0028] The beneficial effects of the present invention are as follows: the first adjusting arm is pivotally connected to the base frame, and the base frame is fixed to the back side of the seat back, and the lower end of the first adjusting arm is located in the middle of the back side of the seat back, so that the front and rear position of the headrest can be adjusted in a large range, and then the second adjusting arm is pivotally connected to the first adjusting arm so that the second adjusting arm can further adjust the height of the headrest, and finally the direction of the headrest can be conveniently adjusted by pivoting the headrest to the second adjusting arm. Through the three-stage adjustment structure, the adjustment range of the headrest can be maximized, the flexibility is stronger, and it can adapt to the user in the largest range. At the same time, the first adjusting arm is pivotally connected to the middle part of the back of the seat back, so as to avoid fixing the headrest directly to the top of the seat back, so that the upper half of the seat back can be freed, and the upper half of the seat back can move and deform freely without affecting the position of the headrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the utility model after the chair body is hidden;

[0032] Figure 3 for Figure 2 Exploded diagram. DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0034] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference Figures 1 to 3 , a conveniently adjustable headrest, comprising:

[0038] Base frame 1;

[0039] A first adjustment arm 20, wherein the first adjustment arm 20 is pivotally connected to the top of the base frame 1;

[0040] a second adjusting arm 30 , the second adjusting arm 30 being pivotally connected to the top of the first adjusting arm 20 ;

[0041] The headrest 40 has a back side pivotally connected to the front end of the second adjustment arm 30 .

[0042] The present invention also discloses a chair, comprising a seat 10 and a backrest 11, which uses the above-mentioned easily adjustable headrest, wherein the base frame 1 is fixed to the rear side of the backrest 11, and the lower end of the first adjustment arm 20 is located in the middle of the rear side of the backrest 11.

[0043] In this solution, the top of the first adjustment arm 20 is preferably higher than the top of the seat back 11, so that the headrest 40 and the second adjustment arm 30 can be easily adjusted, thereby ensuring that when the headrest 40 is located at the front end of the seat back 11, the lowest position of the headrest 40 can be lower than the top of the seat back 11.

[0044] The first adjusting arm 20 is pivoted to the base frame 1, and the base frame 1 is fixed to the rear side of the seat back 11, and the lower end of the first adjusting arm 20 is located in the middle of the rear side of the seat back 11, so that the front and rear position of the headrest 40 can be adjusted in a large range, and then the second adjusting arm 30 is pivoted to the first adjusting arm 20 so that the second adjusting arm 30 can further adjust the height of the headrest 40. Finally, by pivoting the headrest 40 to the second adjusting arm 30, the direction of the headrest 40 can be conveniently adjusted. Through the three-stage adjustment structure, the adjustment range of the headrest 40 can be maximized, with greater flexibility, and can adapt to users in the greatest range. At the same time, the first adjusting arm 20 is pivotally connected to the middle part of the back of the seat back 11, so as to avoid fixing the headrest 40 directly to the top of the seat back 11. In this way, the upper part of the seat back 11 can be freed, and the upper part of the seat back 11 can move and deform freely without affecting the position of the headrest 40. However, in traditional chairs, since the headrest 40 is directly fixed to the top of the seat back 11, the upper part of the seat back 11 needs to be very stable. Otherwise, it is impossible to ensure the position of the headrest 40 while allowing the upper part of the seat back 11 to deform freely to provide space for shoulder movement.

[0045] In the present solution, the first adjusting arm 20 is pivoted to the base frame 1, the second adjusting arm 30 is pivoted to the first adjusting arm 20, and the headrest 40 is pivoted to the second adjusting arm 30. The pivoting method can adopt the form of an axis body interference-inserted on the axis hole, so that a larger friction force is formed between them. During adjustment, only the friction force needs to be overcome. This method does not require the setting of an additional positioning structure for assistance, but the disadvantage is that after long-term use, the axis body and the inner wall of the axis hole will wear, resulting in a decrease in the friction force of the axis body rotating in the axis hole.

[0046] For further optimization, it is preferred that a first positioning structure 60 for fixing the first adjusting arm 20 is provided between the base frame 1 and the first adjusting arm 20 .

[0047] In this solution, the first positioning structure 60 preferably includes:

[0048] The base frame 1 is provided with a rotating shaft, and the first adjusting arm 20 is pivotally connected to the base frame 1 through the rotating shaft;

[0049] A first ratchet, a first pawl is arranged on the outer periphery of the first ratchet, the first ratchet is fixed on the first adjusting arm 20, and the axis of the first ratchet is coaxial with the rotation axis of the first adjusting arm 20, a reset torsion spring fixed on the base frame 1 is arranged on the first ratchet, a running groove located on the same plane as the first ratchet and a reset groove misaligned with the first ratchet are arranged on the outer periphery of the first ratchet, the head end of the running groove is connected with the reset groove, the tail end of the running groove is connected with the reset groove, and a receiving surface is arranged at the bottom of the reset groove;

[0050] The first pawl is pivotally connected to the base frame 1, and a first spring is provided on the first pawl to drive the first pawl to swing toward the first ratchet. The front end of the first pawl performs a circular motion along the travel groove and the reset groove. When the first pawl is located in the travel groove, the front end of the first pawl engages with the first ratchet.

[0051] In this way, when the first adjusting arm 20 swings along the back side of the chair back 11 toward the front side of the chair back 11, the first adjusting arm 20 drives the first ratchet to rotate relative to the first pawl. At this time, the first pawl is located in the travel groove, so that the first pawl is engaged with the first ratchet. In the process of swinging toward the front, the first ratchet can push the first pawl to overcome the elastic force of the first spring and bounce up, thereby falling onto the ratchet on the rear side. However, when the first adjusting arm 20 swings toward the rear side, the first pawl will get stuck on the ratchet, thereby preventing the first adjustment arm from swinging backward. Only when the first adjusting arm swings to the frontmost position, the first pawl enters the reset groove along the traveling groove, and the first pawl disengages from the first ratchet. At this time, under the action of the reset torsion spring, the first adjusting arm 20 is driven to reset backward. At the same time, the first pawl moves along the reset groove during the resetting of the first adjusting arm and finally returns to the front end of the traveling groove to re-engage with the first ratchet. The supporting surface plays the role of supporting the end of the first pawl when the first pawl enters the reset groove, thereby maintaining the height of the first pawl, so that the first pawl can be smoothly stuck on the ratchet tooth when returning to the traveling groove.

[0052] In other embodiments, the first positioning structure 60 may also be configured as other structures, for example:

[0053] A second ratchet, the second ratchet is disposed on the base frame 1 and is coaxial with the rotation axis of the first adjusting arm 20;

[0054] A second pawl, the end of which is movably engaged with the second ratchet, and the second pawl is provided with a second spring which drives the end of the second pawl to engage with the second ratchet;

[0055] A handle is provided on the first adjusting arm 20 , and the handle is connected to the second pawl and is used to drive the second pawl to swing in a direction of disengaging from the second ratchet wheel.

[0056] Through this structure, the second ratchet and the second pawl are also used to restrict the first adjustment arm 20 from swinging from back to front, thereby preventing the first adjustment arm 20 from moving backward. The difference is that when the first adjustment arm 20 is adjusted to reset backward, the second pawl needs to be driven by the handle to swing and disengage from the second ratchet. Only then can the first adjustment arm be driven to swing backward and reset.

[0057] Similarly, preferably, a second positioning structure for fixing the second adjusting arm 30 is provided between the first adjusting arm 20 and the second adjusting arm 30 .

[0058] In this solution, preferably, the first adjusting arm 20 is provided with a first end surface 22 at the top, and the second adjusting arm 30 is provided with a second end surface 311 abutting against the first end surface 22 at the bottom;

[0059] The second positioning structure comprises:

[0060] Two pairs of opposite locking plates 50 are provided with mutually meshing and annular wave teeth, and the two pairs of locking plates 50 are respectively arranged on the first end face 22 and the second end face 311. The pivot axis of the first adjusting arm 20 and the second adjusting arm 30 is located at the center of the locking plate 50, and the first end face 22 and / or the second end face 311 have elastic deformation.

[0061] Under this structure, when driving the second adjustment arm 30 to rotate relative to the first adjustment arm 20, sufficient external force needs to be applied to cause the first end face 22 and / or the second end face 311 to undergo elastic deformation, thereby causing the wave teeth on the two pairs of locking plates 50 to rotate out of position and achieve the purpose of adjustment.

[0062] The second positioning structure may also be set to other structures, for example:

[0063] A bolt hole is provided on the first adjusting arm 20 , and the end of the bolt hole faces the surface of the second adjusting arm 30 . The positioning bolt threaded in the bolt hole can be fixed when the positioning bolt is rotated inward so that the end face of the positioning bolt abuts against the surface of the second adjusting arm 30 .

[0064] Similarly, it is preferred that a third positioning structure for fixing the headrest 40 is disposed on the back of the second adjustment arm 30 and the headrest 40 .

[0065] In this structure, preferably, a second shaft body 321 is disposed on the top of the second adjustment arm 30, and a second shaft hole 411 for inserting the second shaft body 321 is disposed on the back of the headrest 40;

[0066] The third positioning structure comprises:

[0067] A positioning ridge 3211 disposed on the surface of the second shaft 321;

[0068] A wave tooth group 412 is disposed in the second shaft hole 411 and cooperates with the positioning convex ridge 3211 , and a deformation cavity 413 is disposed on the back of the headrest 40 and located at the rear side of the wave tooth group 412 .

[0069] During adjustment, it is necessary to apply sufficient external force to the headrest 40 so that the positioning ridge 3211 squeezes the surface of the wavy tooth group 412, causing the wavy tooth group 412 to elastically deform toward the deformation cavity 413, thereby causing the positioning ridge 3211 to be offside on the wavy tooth group 412. When the external force stops being applied, the tooth pattern of the wavy tooth group 412 itself can clamp the positioning ridge 3211, thereby preventing the headrest 40 from moving.

[0070] In other embodiments, the third positioning structure may also be selected as:

[0071] An external gear is provided on the second adjusting arm 30, and a forward and backward moving track is provided on the rear side of the headrest 40. An arc-shaped inner rack is movably installed on the forward and backward moving track, and the inner rack is fully meshed with the surface of the external gear. When the inner rack is moved outward until it is fully engaged with the external gear, the headrest 40 is fixed. When the inner rack moves inward along the forward and backward moving track and disengages from the external gear, the headrest 40 is released and can move freely.

[0072] Meanwhile, in the present solution, the specific implementations of the first positioning structure 60 , the second positioning structure, and the third positioning structure can also be used interchangeably.

[0073] Further optimization, in order to ensure the stability of the structure, preferably the middle part of the rear side of the chair back 11 is provided with a mounting arm 12, and the base frame 1 is fixed to the top of the mounting arm 12. In the actual production process of parts, the base frame 1 and the mounting arm 12 are preferably integrally formed.

[0074] On the basis of the above, preferably, the first adjustment arm 20 includes two first support arms 21 respectively pivotally connected to the two sides of the mounting arm 12, and the base frame 1 is two and pivotally connected to the two first support arms 21 respectively;

[0075] The second adjustment arm 30 includes a second arm body 31 at the rear side and two second support arms 32 located at both sides of the front end of the second arm body 31, and the tops of the two first support arms 21 are respectively pivotally connected to both sides of the second arm body 31;

[0076] Two mounting blocks 41 are disposed at the rear side of the headrest 40 , and the two second arms 32 are pivotally connected to the two mounting blocks 41 from the outer sides of the two mounting blocks 41 .

[0077] In this solution, the two second arms 32 are preferably arranged in a trumpet shape at the front end of the second arm body 31, and the inner side surfaces of the two second arms 32 are in an arc-shaped transition.

[0078] In other embodiments, the first adjustment arm 20 and the second adjustment arm 30 may also be provided as a straight rod structure, and the base frame 1 may also be directly fixed to the middle of the rear side of the chair back 11 without providing a mounting arm.

[0079] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An easily adjustable headrest, characterized in that: include: Base frame (1); A first adjustment arm (20), the first adjustment arm (20) being pivotally connected to the top of the base frame (1); A second adjustment arm (30), the second adjustment arm (30) being pivotally connected to the top of the first adjustment arm (20); A headrest (40), the back side of the headrest (40) is pivotally connected to the front end of the second adjustment arm (30).

2. The easily adjustable headrest according to claim 1, characterized in that: A first positioning structure (60) for fixing the first adjusting arm (20) is provided between the base frame (1) and the first adjusting arm (20).

3. The easily adjustable headrest according to claim 2, characterized in that: The base frame (1) is provided with a rotating shaft, and the first adjusting arm (20) is pivotally connected to the base frame (1) via the rotating shaft; The first positioning structure (60) comprises: A first ratchet, a first pawl is arranged on the outer periphery of the first ratchet, the first ratchet is fixed on the first adjustment arm (20), and the axis of the first ratchet is coaxial with the rotation axis of the first adjustment arm (20), the first ratchet is provided with a reset torsion spring fixed on the base frame (1), the outer periphery of the first ratchet is provided with a travel groove located on the same plane as the first ratchet and a reset groove offset from the first ratchet, the travel groove and the reset groove are connected at the head end, the travel groove and the reset groove are connected at the tail end, and the reset groove is provided with a receiving surface at the bottom; A first pawl, the first pawl is pivotally connected to the base frame (1), and a first spring is provided on the first pawl to drive the first pawl to swing toward the first ratchet wheel. The front end of the first pawl performs a circular motion along the travel groove and the reset groove. When the first pawl is located in the travel groove, the front end of the first pawl engages with the first ratchet wheel.

4. The easily adjustable headrest according to claim 1, characterized in that: A second positioning structure for fixing the second adjusting arm (30) is provided between the first adjusting arm (20) and the second adjusting arm (30).

5. The easily adjustable headrest according to claim 4, characterized in that: The first adjusting arm (20) is provided with a first end surface (22) at the top, and the second adjusting arm (30) is provided with a second end surface (311) abutting against the first end surface (22) at the bottom; The second positioning structure comprises: Two pairs of opposite locking plates (50) are provided with mutually meshing and annular wave-shaped teeth, the two pairs of locking plates (50) are respectively arranged on the first end surface (22) and the second end surface (311), the pivot axis of the first adjustment arm (20) and the second adjustment arm (30) is located at the center of the locking plate (50), and the first end surface (22) and / or the second end surface (311) have elastic deformation.

6. The easily adjustable headrest according to claim 1, characterized in that: The second adjustment arm (30) and the back of the headrest (40) are provided with a third positioning structure for fixing the headrest (40).

7. The easily adjustable headrest according to claim 6, characterized in that: A second shaft body (321) is disposed on the top of the second adjustment arm (30), and a second shaft hole (411) is disposed on the back of the headrest (40) for inserting the second shaft body (321); The third positioning structure comprises: A positioning ridge (3211) disposed on the surface of the second shaft (321); A wave tooth group (412) is arranged in the second shaft hole (411) and cooperates with the positioning ridge (3211), and a deformation cavity (413) is arranged on the back of the headrest (40) and is located on the rear side of the wave tooth group (412).

8. The easily adjustable headrest according to claim 1, characterized in that: The first adjustment arm (20) comprises two first support arms (21); The second adjustment arm (30) comprises a second arm body (31) at the rear side and two second support arms (32) located at both sides of the front end of the second arm body (31), and the tops of the two first support arms (21) are respectively pivotally connected to both sides of the second arm body (31); Two mounting blocks (41) are arranged on the rear side of the headrest (40), and two second arms (32) are respectively pivotally connected to the two mounting blocks (41) from the outer sides of the two mounting blocks (41).

9. A chair, comprising a seat (10) and a backrest (11), characterized in that An easily adjustable headrest as claimed in any one of claims 1 to 8 is used, wherein the base frame (1) is fixed to the rear side of the seat back (11), and the lower end of the first adjustment arm (20) is located in the middle of the rear side of the seat back (11).

10. A chair as claimed in claim 9, characterized in that: A mounting arm (12) is provided in the middle of the rear side of the chair back (11), and the base frame (1) is fixed to the top of the mounting arm (12).

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