Headrest rotating supporting mechanism

Abstract

The utility model provides a headrest rotating supporting mechanism which comprises a back support, a rotating arm and a locking assembly, the rotating arm connected with a headrest is rotatably connected to an installation part protruding backwards at the rear lower portion of the back support, so that the rotating arm and the back support form an adjusting space in the front-back position; the rotating arm is rotated or locked in the adjusting space in the front-back direction through the locking assembly, so that the supporting position of the headrest can be adjusted in the front-back direction; when the sitting posture of the user changes and the front-back position of the head of the user changes, the rotating arm can rotate front and back and be locked in the adjusting space so as to correspondingly support the head of the user.

Description

Technical Field

[0001] The utility model relates to the field of seats, in particular to a headrest rotation support mechanism. Background Art

[0002] In order to provide support for the user's head during use, ergonomic chairs on the market usually have a rotatable and adjustable headrest above the back support of the chair back assembly. The headrest can rotate forward and backward relative to the back support, thereby providing effective support for the user's head.

[0003] For example, in the headrest adjustment mechanism of the patent publication number CN220088987, as shown in the patent Figure 1 As shown, the headrest is connected to the headrest connecting seat 2, one end of the support arm 3 is rotatably connected to the headrest connecting seat 2, the upper part of the seat back connecting seat 1 is integrally provided with two fixed arms 13, and the support arm 3 is integrally provided with a first sub-arm 31 inserted between the two fixed arms 13, the fixed arm 13 and the first sub-arm 31 are rotatably connected by a first rotating shaft, the headrest can rotate with the rotation of the first sub-arm 31, but because the first sub-arm 31 is directly connected to the upper end of the seat back, the front and rear adjustment space of the headrest is insufficient; specifically, when the first sub-arm 31 rotates front and back, the headrest support surface will greatly deviate from the original support position, causing the headrest support surface that should be facing the front end of the seat back to face the upper or lower end of the seat back, and cannot form effective support for the head. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a headrest rotation support mechanism, which is achieved by rotatably connecting a swivel arm connected to the headrest to a mounting portion protruding rearward at the lower rear of a back bracket, so that the swivel arm and the back bracket form an adjustment space in the front and rear position, and then utilizing a locking assembly to rotate or lock the swivel arm in the adjustment space in the front and rear direction, so that the support position of the headrest can be adjusted front and rear.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A headrest rotation support mechanism, comprising:

[0007] The back bracket protrudes backwards from the rear lower portion of the back bracket, and a mounting portion is formed at the rear lower portion of the back bracket.

[0008] The rotating arm comprises a vertical section, the upper end of the vertical section extends forward to form a horizontal section, the lower end of the vertical section has a second connecting portion, the front end of the horizontal section has a first connecting portion for connecting to the headrest, the position of the first connecting portion is forward beyond the upper edge of the back bracket; the second connecting portion is rotatably connected to the mounting portion, so that the rotating arm and the back bracket form an adjustment space in the front-to-back direction;

[0009] A locking assembly, disposed between the second connecting portion and the mounting portion, the locking assembly being capable of locking or unlocking the rotating arm;

[0010] The mechanism has a locked state and an unlocked state. When the mechanism is in the unlocked state, the locking component unlocks the rotating arm, so that the rotating arm can rotate back and forth to a predetermined position in the adjustment space under the action of external force; when the mechanism switches to the locked state, the locking component can lock the rotating arm rotated to the predetermined position to limit the forward and backward rotation of the rotating arm.

[0011] Preferably, a rotation support shaft is provided between the second connection part and the chair back to provide rotation support for the second connection part; the rotation support shaft enables the rotation arm to rotate stably.

[0012] Preferably, the rotating support shaft can elastically extend and retract along its own length direction; the locking assembly includes a locking gear connected to one end of the rotating support shaft, and a locking tooth groove matching the locking gear is provided on the second connecting part; when the mechanism is in an unlocked state, the rotating support shaft elastically extends along the initial position under the action of external force, and drives the locking gear out of the locking tooth groove; when the mechanism is switched to a locked state, the external force is removed, the rotating support shaft elastically retracts to the initial position, and drives the locking gear to engage in the locking tooth groove; the locking process of the rotating arm by the locking assembly is simplified to a simple elastic extension and retraction process of the rotating support shaft, thereby improving the efficiency of locking or unlocking the rotating arm.

[0013] Preferably, the outer end of the locking gear is connected to a limiting end cover, and the outer diameter of the limiting end cover is larger than the outer diameter of the locking gear; a limiting groove adjacent to the locking tooth groove is provided on the second connecting part; when the mechanism is in an unlocked state, the rotating support shaft elastically extends along the initial position under the action of external force, and drives the limiting end cover to separate from the bottom wall of the limiting groove; when the mechanism is switched to a locked state, the external force is removed, the rotating support shaft elastically retracts to the initial position, and drives the limiting end cover to abut against the bottom wall of the limiting groove; to ensure that the locking gear can normally cooperate or separate with the locking tooth groove, so that the locking gear can correspondingly lock or unlock the rotating arm.

[0014] Preferably, the rotating support shaft, the locking gear and the limiting end cover are integrally formed; the integrally formed design is simple, efficient and easy to install.

[0015] Preferably, the opposite end of the rotating support shaft connected to the locking gear is connected with an exposed pressing portion, and the second connecting portion is provided with an installation groove for accommodating the pressing portion; the pressing portion slides in the installation groove and drives the rotating support shaft to elastically extend and retract along the initial position; the pressing portion is convenient for manual pressing, so that the user can lock or unlock the rotating arm according to their own needs.

[0016] Preferably, the rotating support shaft can be elastically extended and retracted along its own length direction, which means that: a clamping groove concentric with the mounting groove is provided on the inner side of the mounting groove, and a spring is sleeved on the rotating support shaft and is located between the pressing part and the bottom wall of the clamping groove; the spring can provide the rotating support shaft with power for elastic extension and retraction.

[0017] Preferably, the limiting groove is through-through to form an opening, and a protective cover is provided at the opening of the limiting groove; the protective cover can shield the limiting end cover in the limiting groove to prevent debris from entering the limiting groove.

[0018] Preferably, a through groove with a hexagonal cross-sectional shape is provided on the mounting portion, and a penetration portion with a hexagonal cross-sectional shape is provided between the two ends of the rotating support shaft, and the penetration portion is located in the through groove to keep the rotating support shaft circumferentially fixed; the penetration portion can remain circumferentially fixed in the through groove, so that when the rotating arm rotates, the penetration portion will not generate rotational friction with the mounting portion.

[0019] The principle and beneficial effects of the utility model using the above technical solution are:

[0020] The purpose of the utility model is to provide a headrest rotation support mechanism, which forms an adjustment space in the front-to-back position of the rotation arm and the back support by rotationally connecting the rotation arm connected to the headrest to a mounting portion protruding rearward at the lower rear of the back support, and then utilizes a locking component to rotate or lock the rotation arm in the adjustment space in the front-to-back direction; when the user's sitting posture changes and thus causes the front-to-back position of his head to change, the rotation arm can be rotated and locked in the adjustment space to provide corresponding support for the user's head. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the headrest adjustment mechanism installed on the seat;

[0022] Figure 2 is a cross-sectional view of a second connecting portion position locking assembly on a rotating arm;

[0023] Figure 3 This is a schematic diagram of the structure of the locking assembly after the installation portion and the second connecting portion are hidden;

[0024] Figure 4 This is an enlarged view of the mounting groove and the clamping groove at one end of the rotating arm;

[0025] Figure 5 It is an enlarged view of the limit groove and the locking tooth groove at the other end of the rotating arm;

[0026] Figure 6 is a schematic diagram of the structure of the locking member;

[0027] Figure 7 It is an enlarged view of the mounting portion on the back bracket;

[0028] The figures are marked as follows: 1-rotating arm, 2-back frame, 3-locking piece, 4-pressing part, 5-spring, 6-protective cover, 11-second connecting part, 12-installing groove, 13-card slot, 14-limiting slot, 15-locking tooth groove, 16-first connecting part, 1a-vertical section, 1b-horizontal section, 21-back support frame, 22-back bracket, 23-through slot, 31-limiting end cover, 32-locking gear, 33-rotating support shaft, 34-penetrating part, 41-blocking cover, 42-connecting part, s-adjusting space. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0032] The specific implementation methods of the utility model are as follows:

[0033] like Figure 1-7 As shown, this embodiment provides a headrest rotation support mechanism, comprising:

[0034] The back bracket 22 protrudes rearwardly from the rear lower portion of the back bracket 22, and a mounting portion 23 is formed at the rear lower portion of the back bracket 22;

[0035] The rotating arm 1 includes a vertical section 1a, the upper end of the vertical section 1a extends forward to form a horizontal section 1b, the vertical section 1a and the horizontal section 1b are integrally formed, and the overall shape is 7, the lower end of the vertical section 1a has a second connecting portion 11, the front end of the horizontal section 1b has a first connecting portion 16 for connecting to a headrest, and the position of the first connecting portion 16 exceeds the upper edge of the back bracket 1 forward; the second connecting portion 11 is rotatably connected to the mounting portion 23, so that the rotating arm 1 and the back bracket 22 form an adjustment space s in the front-to-back direction;

[0036] A locking assembly, disposed between the second connecting portion 11 and the mounting portion 23, the locking assembly can lock or unlock the rotating arm 1;

[0037] The mechanism has a locked state and an unlocked state. When the mechanism is in the unlocked state, the locking component unlocks the rotating arm 1, so that the rotating arm 1 can rotate back and forth to a predetermined position in the adjustment space s under the action of external force; when the mechanism is switched to the locked state, the locking component can lock the rotating arm 1 rotated to the predetermined position to limit the rotating arm 1 from rotating back and forth.

[0038] Furthermore, the mechanism is installed on the back of a chair, which includes a back frame 2, which includes a back support frame 21 facing the back of a human body, the front end of the back support frame 21 is used to support the back of a human body, and the back bracket 22 is connected to the rear end of the back support frame 21. When the human body leans on the back support frame 21, the headrest can be rotated and adjusted in the adjustment space s. During rotation, due to the existence of the adjustment space s, the support surface of the headrest will not deviate significantly from the front, so that the headrest can effectively support the head at the front end of the back support frame 21.

[0039] like Figure 2-3 As shown, further, the rotating support shaft 33 can be elastically extended and retracted along its own length direction; the locking assembly includes a locking gear 32 connected to one end of the rotating support shaft 33, and the second connecting part 11 is provided with a locking tooth groove 15 matching the locking gear 32; when the mechanism is in an unlocked state, the rotating support shaft 33 elastically extends along the initial position under the action of external force, and drives the locking gear 32 to disengage from the locking tooth groove 15; when the mechanism is switched to a locked state, the external force is removed, the rotating support shaft 33 elastically retracts to the initial position, and drives the locking gear 32 to engage in the locking tooth groove 15; the locking process of the rotating arm 1 by the locking assembly is simplified to a simple elastic extension process of the rotating support shaft 33, thereby improving the efficiency of locking or unlocking the rotating arm 1.

[0040] Further, if Figure 6 As shown, the locking gear 32 is evenly distributed with a plurality of locking teeth in the circumferential direction, each locking tooth is closely adjacent to each other, and a smooth transition surface is formed at the junction position. Correspondingly, the locking tooth groove 15 is also evenly distributed with a plurality of locking grooves in the circumferential direction, each locking groove is closely adjacent to each other, and a smooth transition surface is formed at the junction position between the locking grooves, and the transition surface can play a guiding role; therefore, when the rotating arm 1 rotates back and forth, although the circumferential position of the locking groove in the locking tooth groove 15 changes relative to the initial locking gear 32, due to this smooth transition design, even if the locking gear 32 is occasionally misaligned with the locking tooth groove 15, relying on these smooth transition surfaces, the locking gear 32 can still re-enter the locking tooth groove 15 and lock the rotating arm 1.

[0041] Furthermore, in order to ensure the stable cooperation between the locking gear 32 and the locking tooth groove 15, the outer end of the locking gear 32 is connected to the limiting end cover 31, and the outer diameter of the limiting end cover 31 is larger than the outer diameter of the locking gear 32; the second connecting part 11 is provided with a limiting groove 14 adjacent to the locking tooth groove 15; when the mechanism is in the unlocked state, the rotating support shaft 33 elastically extends along the initial position under the action of external force, and drives the limiting end cover 31 to separate from the bottom wall of the limiting groove 14; when the mechanism is switched to the locked state, the external force is removed, the rotating support shaft 33 elastically retracts to the initial position, and drives the limiting end cover 31 to abut against the bottom wall of the limiting groove 14; in order to avoid the locking gear 32 from falling out of the locking tooth groove 15 when the rotating support shaft 33 retracts, this design ensures that the locking gear 32 can normally cooperate or separate with the locking tooth groove 15, so that the locking gear 32 can correspondingly lock or unlock the rotating arm 1.

[0042] Further, if Figure 2-5 As shown, the elastic extension of the rotating support shaft 33 requires external force to press and trigger. In order to facilitate pressing, the opposite end of the rotating support shaft 33 connected to the locking gear 32 is connected with a pressing portion 4 exposed to the rotating arm 1, and the second connecting portion 11 is provided with a mounting groove 12 for accommodating the pressing portion 4; the pressing portion 4 includes a connecting portion 42 threadedly connected to the rotating support shaft 33, and the outer end of the connecting portion 42 is provided with an opening for facilitating the installation of screws, and the opening is threadedly connected with a blocking cover 41 for covering the opening; the pressing portion 4 slides in the mounting groove 12, and drives the rotating support shaft 33 to elastically extend and retract along the initial position; the pressing portion 4 is convenient for manual pressing, so that the user can lock or unlock the rotating arm 1 according to their own needs.

[0043] Furthermore, the fact that the rotating support shaft 33 can be elastically extended and retracted along its own length direction means that: a slot 13 concentric with the mounting slot 12 is provided on the inner side of the mounting slot 12, and a spring 5 is sleeved on the rotating support shaft 33 and is located between the pressing portion 4 and the bottom wall of the slot 13; the spring 5 can provide the rotating support shaft 33 with power for elastic extension and retraction; specifically, the spring 5 is a compression spring, and when the pressing portion 4 is subjected to force, the compression spring will be elastically compressed, and drive the locking gear 32 to disengage from the locking tooth groove 15, so that the rotating arm 1 can rotate back and forth, and when the rotating arm 1 is rotated to the predetermined position, the external force on the pressing portion 4 is removed, the compression spring will elastically retract and reset, and drive the locking gear 32 to be clamped into the locking tooth groove 15 again, thereby completing the locking of the rotating arm 1.

[0044] Furthermore, in order to allow the locking gear 32 to cooperate normally with the lock groove tooth groove 15, the limit groove 14 is penetrated outward to form an opening, and a protective cover 6 is provided at the opening position of the limit groove 14; the protective cover 6 can cover the limit end cover 31 in the limit groove 14 to prevent debris from entering the limit groove 14.

[0045] Further, if Figure 7As shown, the rotating support shaft 33 provides rotating support for the rotating arm 1, but in order to avoid rotational wear between the rotating support shaft 33 and the mounting portion 23, the rotating support shaft 33 itself does not rotate, and therefore a through groove 21 with a hexagonal cross-sectional shape is provided on the mounting portion 23, and a through-hole 34 with a hexagonal cross-sectional shape is provided between the two ends of the rotating support shaft 33, and the through-hole 34 is in the through groove 21 to keep the rotating support shaft 33 circumferentially fixed; the through-hole 34 can be kept circumferentially fixed in the through groove 21, so that when the rotating arm 1 rotates, the through-hole 34 will not generate rotational friction with the mounting portion 23, thereby avoiding the rotating support shaft 33 causing rotational wear on the mounting portion 23 due to the simultaneous rotation of the rotating arm 1.

[0046] Further, if Figure 6 As shown, in order to facilitate production and installation, the rotating support shaft 33, the locking gear 32, and the limiting end cover 31 are integrally formed; the penetration portion 34 is located between the two ends of the rotating support shaft 33, and is also integrally formed with the rotating support shaft 33; specifically, the four components are integrally formed into a locking member 3, and the locking member 3 is an open mold component; during installation, it is only necessary to align the second connecting portion 11 of the rotating arm 1 with the mounting portion 23, and then insert the locking member 3 between the second connecting portion 11 and the mounting portion 23, so that the four components can be quickly installed; this one-piece design makes the installation process of each component relatively simple, and can be suitable for large-scale batch production.

[0047] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A headrest rotation support mechanism, It is characterized in that include: A back bracket (22); the lower rear portion of the back bracket (22) protrudes rearward, and a mounting portion (23) is formed at the lower rear portion of the back bracket (22); The rotating arm (1) comprises a vertical section (1a), the upper end of the vertical section (1a) extends forward to form a horizontal section (1b), the lower end of the vertical section (1a) has a second connecting portion (11), the front end of the horizontal section (1b) has a first connecting portion (16) for connecting to a headrest, the position of the first connecting portion (16) is forward beyond the upper edge of the back support (22); the second connecting portion (11) is rotatably connected to the mounting portion (23), so that an adjustment space (s) is formed between the rotating arm (1) and the back support (22) in the front-to-back direction; A locking assembly, arranged between the second connecting portion (11) and the mounting portion (23), the locking assembly being capable of locking or unlocking the rotating arm (1); The mechanism has a locked state and an unlocked state. When the mechanism is in the unlocked state, the locking component unlocks the rotating arm (1), so that the rotating arm (1) can be rotated to a predetermined position in the adjustment space (s) under the action of an external force; when the mechanism is switched to the locked state, the locking component can lock the rotating arm (1) rotated to the predetermined position, so as to restrict the rotating arm (1) from rotating to the predetermined position.

2. A headrest rotation support mechanism according to claim 1, Features: A rotation support shaft (33) is provided between the second connection part (11) and the chair back for providing rotation support for the second connection part (11).

3. A headrest rotation support mechanism according to claim 2, Features: The rotating support shaft (33) can be elastically extended and retracted along its own length direction; the locking assembly comprises a locking gear (32) connected to one end of the rotating support shaft (33); a locking tooth groove (15) matching the locking gear (32) is provided on the second connecting portion (11); when the mechanism is in an unlocked state, the rotating support shaft (33) elastically extends along the initial position under the action of an external force, and drives the locking gear (32) to escape from the locking tooth groove (15); when the mechanism is switched to a locked state, the external force is removed, the rotating support shaft (33) elastically retracts to the initial position, and drives the locking gear (32) to engage in the locking tooth groove (15).

4. A headrest rotation support mechanism according to claim 3, Features: The outer end of the locking gear (32) is connected to the limiting end cover (31), and the outer diameter of the limiting end cover (31) is larger than the outer diameter of the locking gear (32); the second connecting portion (11) is provided with a limiting groove (14) adjacent to the locking tooth groove (15); when the mechanism is in an unlocked state, the rotating support shaft (33) elastically extends along the initial position under the action of an external force, and drives the limiting end cover (31) to separate from the bottom wall of the limiting groove (14); when the mechanism is switched to a locked state, the external force is removed, the rotating support shaft (33) elastically retracts to the initial position, and drives the limiting end cover (31) to abut against the bottom wall of the limiting groove (14).

5. A headrest rotation support mechanism according to claim 4, Features: The rotating support shaft (33), the locking gear (32), and the limiting end cover (31) are integrally formed.

6. A headrest rotation support mechanism according to claim 4, Features: An exposed pressing portion (4) is connected to the opposite end of the rotating support shaft (33) connected to the locking gear (32), and a mounting groove (12) for accommodating the pressing portion (4) is provided on the second connecting portion (11); the pressing portion (4) slides in the mounting groove (12) and drives the rotating support shaft (33) to elastically expand and contract along the initial position.

7. A headrest rotation support mechanism according to claim 6, Features: The rotating support shaft (33) can be elastically extended and retracted along its own length direction, which means that a clamping groove (13) concentric with the mounting groove (12) is provided inside the mounting groove (12), and a spring (5) is sleeved on the rotating support shaft (33) and is located between the pressing portion (4) and the bottom wall of the clamping groove (13).

8. The headrest rotation support mechanism according to claim 4, Features: The limiting groove (14) penetrates outwards to form an opening, and a protective cover (6) is provided at the opening position of the limiting groove (14).

9. The headrest rotation support mechanism according to claim 2, Features: A through groove (21) with a hexagonal cross section is provided on the mounting portion (23), and a through-hole (34) with a hexagonal cross section is provided between the two ends of the rotating support shaft (33). The through-hole (34) is located in the through groove (21) so that the rotating support shaft (33) remains fixed in the circumferential direction.

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