Novel bidirectional adjusting mechanism for automobile headrest

Abstract

The utility model aims to provide the novel bidirectional adjusting mechanism for the automobile headrest, the adjusting mechanism is controlled by the button switch to realize the function of adjusting the height and the front and back of the headrest at one time, the defect of sectional adjustment is overcome, and the operation steps are also simplified at the same time. The first small spring is coaxially matched with the button; the button shell is clamped on the headrest front shell; the adjuster is coaxially matched with the headrest front shell; the second small spring is coaxially matched with the regulator; the interlocking structure is coaxially matched with the lower rotating shaft and can rotate; the upper gear blade is coaxially matched with the upper rotating shaft; the lower gear blade is coaxially matched with the lower rotating shaft; the spring is hung on the upper gear blade and the lower gear blade; the headrest rear shell and the headrest front shell are clamped and fixed; and the left headrest rod and the right headrest rod are welded and fixed with the upper rotating shaft and the lower rotating shaft. The utility model has the advantages and positive effects that the headrest can be manually controlled to realize the function of adjusting the height and the front and back at one time.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile interior decoration and relates to a novel two-way adjustment mechanism for an automobile headrest. Background Art

[0002] With the development of the automotive industry, end users require that car interiors not only be safe but also comfortable. When the vehicle is impacted, the headrest can prevent the occupant's head from moving backward, providing support and protecting the occupant's head and neck from injury. At the same time, the headrest must also ensure passenger comfort by adjusting the height and angle of the headrest to better fit the occupant's head and cervical spine. Conventional headrests are adjusted separately for height and fore-and-aft, and cannot meet the requirements of simultaneous two-way adjustment. Against this background, a new type of two-way adjustment mechanism for automotive headrests has emerged. This headrest mechanism is simple, easy to operate, and can achieve simultaneous height and fore-and-aft adjustment. Utility Model Content

[0003] The purpose of the utility model is to provide a new type of two-way adjustment mechanism for automobile headrests, which can realize one-time height and front and rear adjustment functions of the headrest by controlling the adjustment mechanism through a button switch, so that it can be adjusted to a suitable and comfortable usage position, overcoming the disadvantages of segmented adjustment and simplifying the operation steps.

[0004] The utility model solves the technical problem by adopting the following technical solutions:

[0005] A novel bidirectional adjustment mechanism for a car headrest, comprising a button 1, a button housing 2, a first small spring 3, an adjuster 4, a lock spring 5, an interlocking structure 6, a headrest front housing 7, an upper gear leaf 8, a lower gear leaf 9, an upper rotating shaft 10, a lower rotating shaft 11, a spring 12, a headrest rear housing 13, a left headrest rod 14, a right headrest rod 15, and a second small spring 16; wherein the button 1 slides along the button housing slideway 201; the first small spring 3 is coaxially matched with the button 1 (such as Figure 4 As shown); the button shell 2 is clamped on the positioning surface 701 of the headrest front shell 7; the first rotating shaft 401 and the second rotating shaft 402 of the regulator 4 are coaxially matched with the first positioning hole 702 and the second positioning hole 703 of the headrest front shell 7, and can rotate around the first rotating shaft 401 and the second rotating shaft 402 under force (as shown); Figure 10 The second small spring 16 is coaxial with the second shaft 402 of the regulator 4, one end is fixedly connected to the front shell 7 of the headrest, and the other end is fixedly connected to the regulator 4 (as shown); Figure 11As shown), it is used to return the adjuster 4; the opening slots 601 and 602 of the interlocking structure 6 are coaxially matched with the lower rotating shaft 11 and can rotate; the lock spring 5 is fixed to the lower rotating shaft 11 to support the interlocking structure 6; the positioning holes 801 and 802 of the upper gear leaf 8 are coaxially matched with the upper rotating shaft 10 and can rotate, the opening slots 803 and 804 of the upper gear leaf 8 are engaged with the protruding structure 704 of the headrest front shell 7, and the teeth 805 of the upper gear leaf 8 are engaged with the teeth 603 of the interlocking structure 6 (as shown Figure 6 、 Figure 7 、 Figure 8 and Figure 12 The positioning holes 901, 902 and 903 of the lower gear leaf 9 are coaxially matched with the lower shaft 11 and can rotate around the lower shaft 11 under the action of the spring 12 (as shown); Figure 12 The second positioning shaft 904 and the third positioning shaft 905 of the lower gear leaf 9 are fixedly connected with the first opening groove 705 and the second opening groove 706 of the headrest front shell 7 (as shown); Figure 9 、 Figure 12 、 Figure 13 The upper end of the spring 12 is hooked on the first positioning shaft 806 of the upper gear leaf 8, and the lower end of the spring 12 is hooked on the fourth positioning shaft 906 of the lower gear leaf 9 (as shown); Figure 14 the headrest rear shell 13 is fixed to the headrest front shell 7; the left headrest rod 14 and the right headrest rod 15 are welded to the upper shaft 10 and the lower shaft 11.

[0006] When the headrest needs to be moved forward and upward, the button 1 can be pressed. The button 1 moves inward along the slide 201 under the force and pushes the adjuster 4 to rotate counterclockwise around the first rotating shaft 401 and the second rotating shaft 402 (as shown in FIG. Figure 15 As shown in the figure, the second small spring 16 is compressed and accumulates force. After the adjuster 4 rotates to a certain angle, it contacts the interlocking structure 6 and applies its downward pressure. After the interlocking structure 6 is forced to rotate downward around the lower rotating shaft 11, the upper gear leaf 8 is unlocked and the upper gear leaf 8 performs a circular motion around the upper rotating shaft 10. Since the front headrest shell 7 is engaged with the upper gear leaf 8, the headrest front shell 7 is pulled forward and upward at this time, and the headrest can be adjusted in height and in both the front and rear directions at one time. When the headrest front shell 7 is adjusted forward, the spring 12 is stretched. When the headrest front shell 7 is adjusted backward, the spring 12 contracts the elastic force. The upper gear leaf 8 includes multiple teeth. By adjusting different teeth 805 to engage with the interlocking structure teeth 603, the headrest can be adjusted forward and upward in multiple levels. When the appropriate position is reached, the button 1 is released and the button 1 returns to its original position under the elastic force of the first small spring 3. The adjuster 4 returns to its original position under the elastic force of the second small spring 16. Then the interlocking structure 6 returns to its original position and is locked with the upper gear leaf 8.

[0007] When the headrest needs to move backward and downward, just press button 1 and the headrest will automatically return to the final and lowest position. The principle is as follows: under force, button 1 moves inward along the slide 201 and pushes the adjuster 4 to rotate around the first rotating shaft 401 and the second rotating shaft 402. After the adjuster 4 rotates to a certain angle, it contacts the interlocking structure 6 and applies its downward pressure. After the interlocking structure 6 rotates downward under force, the upper gear leaf 8 is unlocked. Since the double-headed hook of the spring 12 is respectively fixed on the upper gear leaf 8 and the lower gear leaf 9, the spring is in a stretched state. The upper gear leaf 8 and the lower gear leaf 9 automatically return to the final and lowest position under the tension of the spring 12, so that the upper gear leaf 8 pulls the front shell of the headrest back to the final and lowest position.

[0008] Except for the first small spring 3, the lock spring 5, the upper rotating shaft 10, the lower rotating shaft 11, the spring 12, the left headrest rod 14, the right headrest rod 15 and the second small spring 16, which are metal parts, the others are plastic injection molding structures.

[0009] The advantages and positive effects of the utility model are:

[0010] The utility model has reasonable design, compact structure, simple structure and simple operation. This structure and layout can be widely used in the layout of headrest assemblies. The utility model can meet the needs of manually controlling the headrest to achieve one-time height and front and back adjustment functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the outline diagram of a new type of two-way adjustment mechanism for automobile headrest;

[0012] Figure 2 It is a structural diagram of a new type of automobile headrest two-way adjustment mechanism;

[0013] Figure 3 This is an exploded view of a new type of automobile headrest two-way adjustment mechanism;

[0014] Figure 4 yes Figure 3 Assembly drawing of middle button 1;

[0015] Figure 5 yes Figure 3 A schematic structural diagram of the middle regulator 4;

[0016] Figure 6 yes Figure 3 A schematic structural diagram of the middle headrest front shell 7;

[0017] Figure 7 yes Figure 3 A schematic structural diagram of the middle upper gear blade 8;

[0018] Figure 8 yes Figure 3 A schematic structural diagram of the middle interlocking structure 6;

[0019] Figure 9 yes Figure 3 A schematic structural diagram of the middle and lower gear blades 9;

[0020] Figure 10 Schematic diagram of the assembly of the adjuster 4 and the middle headrest front shell 7;

[0021] Figure 11 1 is a schematic diagram of the assembly of the second small spring 16 and the regulator 4;

[0022] Figure 12 It is a schematic diagram of the assembly of the interlocking structure 6, the headrest front shell 7, and the upper gear leaf 8;

[0023] Figure 13 It is a schematic diagram of the assembly of the headrest front shell 7, the lower gear leaf 9, and the lower rotating shaft 11;

[0024] Figure 14 1 is an assembly diagram of the upper gear leaf 8, the lower gear leaf 9, and the spring 12;

[0025] Figure 15 Schematic diagram of the connection between the regulator 4 and the interlocking structure 6; DETAILED DESCRIPTION

[0026] The following is a further detailed description of the present invention in conjunction with the accompanying drawings:

[0027] 1. See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 The present embodiment is a novel automobile headrest bidirectional adjustment mechanism, which comprises a button 1, a button housing 2, a first small spring 3, an adjuster 4, a lock spring 5, an interlocking structure 6, a headrest front housing 7, an upper gear leaf 8, a lower gear leaf 9, an upper rotating shaft 10, a lower rotating shaft 11, a spring 12, a headrest rear housing 13, a left headrest rod 14, a right headrest rod 15, and a second small spring 16; wherein the button 1 slides along the button housing slide 201; the first small spring 3 is coaxially matched with the button 1 (such as Figure 4As shown); the button shell 2 is clamped on the positioning surface 701 of the headrest front shell 7; the first rotating shaft 401 and the second rotating shaft 402 of the regulator 4 are coaxially matched with the first positioning hole 702 and the second positioning hole 703 of the headrest front shell 7, and can rotate around the first rotating shaft 401 and the second rotating shaft 402 under force (as shown); Figure 10 The second small spring 16 is coaxial with the second shaft 402 of the regulator 4, one end is fixedly connected to the front shell 7 of the headrest, and the other end is fixedly connected to the regulator 4 (as shown); Figure 11 As shown), it is used to return the adjuster 4; the opening slots 601 and 602 of the interlocking structure 6 are coaxially matched with the lower rotating shaft 11 and can rotate; the lock spring 5 is fixed to the lower rotating shaft 11 to support the interlocking structure 6; the positioning holes 801 and 802 of the upper gear leaf 8 are coaxially matched with the upper rotating shaft 10 and can rotate, the opening slots 803 and 804 of the upper gear leaf 8 are engaged with the protruding structure 704 of the headrest front shell 7, and the teeth 805 of the upper gear leaf 8 are engaged with the teeth 603 of the interlocking structure 6 (as shown Figure 6 、 Figure 7 、 Figure 8 and Figure 12 The positioning holes 901, 902 and 903 of the lower gear leaf 9 are coaxially matched with the lower shaft 11 and can rotate around the lower shaft 11 under the action of the spring 12 (as shown); Figure 12 The second positioning shaft 904 and the third positioning shaft 905 of the lower gear leaf 9 are fixedly connected with the first opening groove 705 and the second opening groove 706 of the headrest front shell 7 (as shown); Figure 9 、 Figure 12 、 Figure 13 The upper end of the spring 12 is hooked on the first positioning shaft 806 of the upper gear leaf 8, and the lower end of the spring 12 is hooked on the fourth positioning shaft 906 of the lower gear leaf 9 (as shown); Figure 14 the headrest rear shell 13 is fixed to the headrest front shell 7; the left headrest rod 14 and the right headrest rod 15 are welded to the upper shaft 10 and the lower shaft 11.

[0028] When the headrest needs to be moved forward and upward, the button 1 can be pressed. The button 1 moves inward along the slide 201 under the force and pushes the adjuster 4 to rotate counterclockwise around the first rotating shaft 401 and the second rotating shaft 402 (as shown in FIG. Figure 15As shown in the figure, the second small spring 16 is compressed and accumulates force. After the adjuster 4 rotates to a certain angle, it contacts the interlocking structure 6 and applies its downward pressure. After the interlocking structure 6 is forced to rotate downward around the lower rotating shaft 11, the upper gear leaf 8 is unlocked and the upper gear leaf 8 performs a circular motion around the upper rotating shaft 10. Since the front headrest shell 7 is engaged with the upper gear leaf 8, the headrest front shell 7 is pulled forward and upward at this time, and the headrest can be adjusted in height and in both the front and rear directions at one time. When the headrest front shell 7 is adjusted forward, the spring 12 is stretched. When the headrest front shell 7 is adjusted backward, the spring 12 contracts the elastic force. The upper gear leaf 8 includes multiple teeth. By adjusting different teeth 805 to engage with the interlocking structure teeth 603, the headrest can be adjusted forward and upward in multiple levels. When the appropriate position is reached, the button 1 is released and the button 1 returns to its original position under the elastic force of the first small spring 3. The adjuster 4 returns to its original position under the elastic force of the second small spring 16. Then the interlocking structure 6 returns to its original position and is locked with the upper gear leaf 8.

[0029] When the headrest needs to move backward and downward, just press button 1 and the headrest will automatically return to the final and lowest position. The principle is as follows: under force, button 1 moves inward along the slide 201 and pushes the adjuster 4 to rotate around the first rotating shaft 401 and the second rotating shaft 402. After the adjuster 4 rotates to a certain angle, it contacts the interlocking structure 6 and applies its downward pressure. After the interlocking structure 6 rotates downward under force, the upper gear leaf 8 is unlocked. Since the double-headed hook of the spring 12 is respectively fixed on the upper gear leaf 8 and the lower gear leaf 9, the spring is in a stretched state. The upper gear leaf 8 and the lower gear leaf 9 automatically return to the final and lowest position under the tension of the spring 12, so that the upper gear leaf 8 pulls the front shell of the headrest back to the final and lowest position.

[0030] Except for the first small spring 3, the lock spring 5, the upper rotating shaft 10, the lower rotating shaft 11, the spring 12, the left headrest rod 14, the right headrest rod 15 and the second small spring 16, which are metal parts, the others are plastic injection molding structures.

[0031] 2. See Figure 4 , the button shell 2 is provided with a button shell slide 201;

[0032] 3. See Figure 5The adjuster 4 is composed of a first rotating shaft 401, a second rotating shaft 402, a protrusion 403, and a force-applying surface 404. The first rotating shaft 401 and the second rotating shaft 402 are coaxially matched with the first positioning hole 702 and the second positioning hole 703 of the headrest front shell 7, and can rotate around the first rotating shaft 401 and the second rotating shaft 402 under force; the second small spring 16 is coaxially matched with the second rotating shaft 402, one end of which is clamped and fixed to the headrest front shell 7, and the other end is clamped and fixed to the adjuster 4; the protrusion 403 is used to transmit the pressure of the button 1, and the force-applying surface 404 is used to transmit the pressure to the interlocking structure 6; the first rotating shaft 401, the second rotating shaft 402, the protrusion 403, and the force-applying surface 404 are integrally injection-molded to constitute the adjuster 4.

[0033] 4. See Figure 6 The headrest front shell 7 is composed of a positioning surface 701, a first positioning hole 702, a second positioning hole 703, a raised structure 704, a first opening groove 705, and a second opening groove 706, wherein the positioning surface 701 is used to clamp and fix the button shell 2; the first positioning hole 702 and the second positioning hole 703 are used to fix the adjuster 4; the raised structure 704 is used to clamp the opening groove 803 and the opening groove 804 of the upper gear leaf 8; the first opening groove 705 and the second opening groove 706 are used to clamp the second positioning axis 904 and the third positioning axis 905 of the lower gear leaf 9; the positioning surface 701, the first positioning hole 702, the second positioning hole 703, the raised structure 704, the first opening groove 705, and the second opening groove 706 are integrally injection molded.

[0034] 5. See Figure 7 The upper gear leaf 8 is composed of a positioning hole 801, a positioning hole 802, an opening groove 803, an opening groove 804, a tooth 805, and a first positioning shaft 806, wherein the positioning hole 801 and the positioning hole 802 are coaxially matched with the upper rotating shaft 10; the opening groove 803 and the opening groove 804 are fixed to the protruding structure 704 of the headrest front shell and can rotate around it; the tooth 805 is used to engage with the interlocking structure 6; the first positioning shaft 806 is used to suspend the spring 12; the positioning hole 801, the positioning hole 802, the opening groove 803, the opening groove 804, the tooth 805, and the first positioning shaft 806 are integrally injection molded.

[0035] 6. See Figure 8 The interlocking structure 6 is composed of an opening groove 601, an opening groove 602, and teeth 603, wherein the opening groove 601 and the opening groove 602 are coaxially matched with the lower rotating shaft 11 and can rotate around the lower rotating shaft 11; the teeth 603 are used to engage and lock with the teeth 805; the opening groove 601, the opening groove 602, and the teeth 603 are integrally injection molded.

[0036] 7. See Figure 9 The lower gear leaf 9 is composed of a positioning hole 901, a positioning hole 902, a positioning hole 903, a second positioning axis 904, a third positioning axis 905, and a fourth positioning axis 906, wherein the positioning hole 901, the positioning hole 902, and the positioning hole 903 are coaxially matched with the upper rotating shaft 10; the second positioning axis 904 and the third positioning axis 905 are clamped and fixed with the first opening groove 705 and the second opening groove 706 of the front shell of the headrest and there is relative movement; the fourth positioning axis 906 is used to suspend the spring 12; the positioning hole 901, the positioning hole 902, the positioning hole 903, the second positioning axis 904, the third positioning axis 905, and the fourth positioning axis 906 are integrally injection molded.

[0037] The utility model meets the test requirements under harsh test conditions such as pulley collision when in use. It is safe and reliable, the locking device structure is not exposed, and the appearance is beautiful and compact. The height and front and back directions can be adjusted in four levels at once by pressing a button.

[0038] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation methods. Any other implementation methods derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A new type of automobile headrest two-way adjustment mechanism, characterized in that It consists of a button (1), a button shell (2), a first small spring (3), an adjuster (4), a lock spring (5), an interlocking structure (6), a headrest front shell (7), an upper gear leaf (8), a lower gear leaf (9), an upper rotating shaft (10), a lower rotating shaft (11), a spring (12), a headrest rear shell (13), a left headrest rod (14), a right headrest rod (15), and a second small spring (16); wherein the button (1) slides along the button shell slideway (201); the first small spring (3) and the button (1) are coaxially matched; the button shell (2) is clamped on the positioning surface (701) of the headrest front shell (7); the adjuster The first rotating shaft (401) and the second rotating shaft (402) of the (4) are coaxially matched with the first positioning hole (702) and the second positioning hole (703) of the headrest front shell (7), and can rotate around the first rotating shaft (401) and the second rotating shaft (402) under force; the second small spring (16) is coaxially matched with the second rotating shaft (402) of the adjuster (4), one end of which is fixedly engaged with the headrest front shell (7) and the other end of which is fixedly engaged with the adjuster (4) for returning the adjuster (4); the opening grooves (601, 602) of the interlocking structure (6) are coaxially matched with the lower rotating shaft (11) and can rotate; the The lock spring (5) is fixed on the lower rotating shaft (11) and is used to support the interlocking structure (6); the positioning holes (801, 802) of the upper gear leaf (8) are coaxially matched with the upper rotating shaft (10) and can rotate, the opening grooves (803, 804) of the upper gear leaf (8) are engaged with the protruding structure (704) of the headrest front shell (7), and the teeth (805) of the upper gear leaf (8) are engaged with the teeth (603) of the interlocking structure (6); the positioning holes (901), the positioning holes (902), and the positioning holes (903) of the lower gear leaf (9) are coaxially matched with the lower rotating shaft (11) and can rotate around the lower rotating shaft (1 1) rotates under the action of the spring (12); the second positioning shaft (904) and the third positioning shaft (905) of the lower gear leaf (9) are fixedly connected with the first opening groove (705) and the second opening groove (706) of the headrest front shell (7); the upper end hook of the spring (12) is hung on the first positioning shaft (806) of the upper gear leaf (8), and the lower end hook of the spring (12) is hung on the fourth positioning shaft (906) of the lower gear leaf (9); the headrest rear shell (13) is fixedly connected with the headrest front shell (7); the left headrest rod (14) and the right headrest rod (15) are fixedly welded with the upper rotating shaft (10) and the lower rotating shaft (11); Except for the first small spring (3), the lock spring (5), the upper rotating shaft (10), the lower rotating shaft (11), the spring (12), the left headrest rod (14), the right headrest rod (15) and the second small spring (16), which are metal parts, the others are plastic injection molding structures.

2. A novel automobile headrest bidirectional adjustment mechanism according to claim 1, characterized in that The button housing (2) is provided with a button housing slideway (201).

3. A novel automobile headrest bidirectional adjustment mechanism according to claim 1, characterized in that The regulator (4) is composed of a first rotating shaft (401), a second rotating shaft (402), a protrusion (403), and a force-applying surface (404). The first rotating shaft (401) and the second rotating shaft (402) are coaxially matched with the first positioning hole (702) and the second positioning hole (703) of the headrest front shell (7), and can rotate around the first rotating shaft (401) and the second rotating shaft (402) under force. The second small spring (16) is coaxially matched with the second rotating shaft (402), one end of which is fixedly engaged with the headrest front shell (7) and the other end of which is fixedly engaged with the regulator (4). The protrusion (403) is used to transmit the pressure of the button (1), and the force-applying surface (404) is used to transmit the pressure to the interlocking structure (6). The first rotating shaft (401), the second rotating shaft (402), the protrusion (403), and the force-applying surface (404) are integrally injection-molded to form the regulator (4).

4. A novel automobile headrest bidirectional adjustment mechanism according to claim 1, characterized in that The headrest front shell (7) is composed of a positioning surface (701), a first positioning hole (702), a second positioning hole (703), a raised structure (704), a first opening groove (705), and a second opening groove (706), wherein the positioning surface (701) is used for clamping and fixing the button shell (2); the first positioning hole (702) and the second positioning hole (703) are used for fixing the adjuster (4); the raised structure (704) is used for clamping the opening grooves (803, 804) of the upper gear leaf (8); the first opening groove (705) and the second opening groove (706) are used for clamping the second positioning shaft (904) and the third positioning shaft (905) of the lower gear leaf (9); the positioning surface (701), the first positioning hole (702), the second positioning hole (703), the raised structure (704), the first opening groove (705), and the second opening groove (706) are integrally injection molded.

5. A novel automobile headrest bidirectional adjustment mechanism according to claim 1, characterized in that The upper gear leaf (8) is composed of positioning holes (801, 802), opening grooves (803, 804), teeth (805), and a first positioning shaft (806), wherein the positioning holes (801, 802) are coaxially matched with the upper rotating shaft (10); the opening grooves (803, 804) are fixedly connected to the headrest front shell protrusion structure (704) and can rotate around it; the teeth (805) are used to engage with the interlocking structure (6); the first positioning shaft (806) is used to suspend the spring (12); the positioning holes (801, 802), opening grooves (803, 804), teeth (805), and the first positioning shaft (806) are integrally injection molded.

6. A novel automobile headrest bidirectional adjustment mechanism according to claim 1, characterized in that The interlocking structure (6) is composed of opening grooves (601, 602) and teeth (603), wherein the opening grooves (601, 602) are coaxially matched with the lower rotating shaft (11) and can rotate around the lower rotating shaft (11); the teeth (603) are used to engage and lock with the teeth (805); the opening grooves (601, 602) and teeth (603) are integrally injection molded.

7. A novel automobile headrest bidirectional adjustment mechanism according to claim 1, characterized in that The lower gear leaf (9) is composed of positioning holes (901, 902, 903), a second positioning shaft (904), a third positioning shaft (905), and a fourth positioning shaft (906), wherein the positioning holes (901, 902, 903) are coaxially matched with the upper rotating shaft (10); the second positioning shaft (904) and the third positioning shaft (905) are fixedly connected to the first opening groove (705) and the second opening groove (706) of the headrest front shell and have relative movement; the fourth positioning shaft (906) is used for suspending the spring (12); the positioning holes (901, 902, 903), the second positioning shaft (904), the third positioning shaft (905), and the fourth positioning shaft (906) are integrally injection molded.

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