Headrest with square guide rail hidden in vertical direction

Abstract

The headrest comprises a headrest fixed end, a headrest sliding end and a headrest framework, the headrest framework is mounted at the headrest sliding end, the headrest fixed end comprises a headrest guide rod, a mounting plate and the square guide rail, the mounting plate is fixed on the headrest guide rod, the square guide rail is fixed on the mounting plate, and the square guide rail is fixed on the mounting plate. Sliding rails are arranged on the two sides of the square guide rail, a guide rail locking gear groove is formed in the middle of the square guide rail, sliding grooves are formed in the two sides of the headrest sliding end, the headrest sliding end is inserted into the guide rail through the sliding grooves, flexible linings are further arranged in the sliding rails, a locking push plate is arranged on the headrest sliding end, and a locking block and a return spring are arranged on the locking push plate. The locking block is clamped into the guide rail locking gear groove to be locked. When the locking push plate is pushed, the return spring is compressed, and the locking block comes out of the guide rail locking gear groove for unlocking. According to the invention, the problems of quick disassembly and assembly of the front wing part of the headrest and exposure of the headrest rod in the motion stroke are solved. Relative flexible sliding and necessary clamping rigidity of the sliding groove and the guide rail are achieved through the flexible matching technology of the square guide rail and the sliding groove.

Description

Technical Field

[0001] The invention belongs to the field of automobile interior decoration, and in particular relates to an automobile headrest. Background Art

[0002] In order to meet people's living needs, many vehicles are equipped with headrests. When most headrests move up and down, the headrest rods are exposed and visible. For this reason, it is necessary to design and develop a hidden headrest to solve the problem of the headrest rod being exposed when the headrest moves up and down. In addition, in order to meet the convenience of headrest installation and later use and maintenance, it is also necessary to design and develop a mechanism to ensure the quick installation and disassembly of the headrest. In addition, most headrests are based on the cooperation of circular guide rods and circular bushings to achieve up and down sliding. Due to the closed nature of the circular bushing, the fastening of the moving part and the fixed part must be arranged outside the full stroke, resulting in the occupation of the upper and lower square spaces of the headrest mechanism, which will correspondingly affect the setting of the up and down stroke of the headrest.

[0003] For example, CN216231852U discloses a new type of automobile seat headrest with a new installation method, including a headrest frame and a headrest base, which belongs to the field of automobile parts. The invention realizes the up and down adjustment function of the headrest and fixes the headrest frame to the automobile seat back frame by aligning the buckle with the slot for snap connection during assembly. However, due to the closedness of the aforementioned circular bushing and guide rod, the span of the installation buckle in the up and down direction, especially in the left and right direction, is very small, making it difficult to ensure the installation rigidity of the headrest frame.

[0004] Another example is CN216833351U, which discloses a suspended adjustable headrest. This invention not only sets the headrest in a suspended position but also makes the height of the headrest adjustable, and is simple to operate and has high adjustment efficiency. However, it is also limited by the closedness of the aforementioned circular bushing and guide rod. Under the premise that the structure ensures the up and down movement stroke, the up and down span of the fixed part of the front structure of the headrest is limited. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a hidden headrest, which solves the problem of the headrest rod being exposed when the headrest moves up and down, while meeting the convenience of the headrest installation and subsequent use and maintenance. It is also necessary to design and develop a mechanism to ensure the quick installation and disassembly of the headrest.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a square guide rail up and down two-way hidden headrest, comprising a headrest fixed end, a headrest sliding end and a headrest frame, the headrest frame is installed on the headrest sliding end, the headrest fixed end comprises a headrest guide rod, a mounting plate, and a square guide rail, the mounting plate is fixed on the headrest guide rod, the square guide rail is fixed on the mounting plate, slide rails are arranged on both sides of the square guide rail, a guide rail locking gear slot is arranged in the middle, slide slots are arranged on both sides of the headrest sliding end, the headrest sliding end is inserted into the guide rail through the slide slot, a flexible bushing is also arranged in the slide rail, a locking push plate is arranged on the sliding end of the headrest, a locking block and a return spring are arranged on the locking push plate, the locking block is stuck in the guide rail locking gear slot to lock; when the locking push plate is pushed, the return spring is compressed, and the locking block comes out of the guide rail locking gear slot to unlock.

[0007] The square guide rail is provided with an upper gear point limit and a lower gear point limit, a limit block is fixed on the sliding end of the headrest, a limit stop point is provided on the limit block, and the limit stop point is provided between the upper and lower gear point limits and slides up and down with the sliding end of the headrest.

[0008] The flexible bushing is arranged between the slide rail and the slide groove, and the flexible bushing comprises a bushing deformation part and a bushing support part.

[0009] The slide rail is provided with a bushing limiter.

[0010] The sliding end of the headrest is provided with a locking thrust plate buckle, and the locking thrust plate is clamped on the sliding end of the headrest through the locking thrust plate buckle.

[0011] The headrest frame is provided with a headrest quick-release buckle, and the sliding end of the headrest is provided with a slide groove quick-release support matched with the headrest quick-release buckle.

[0012] A headrest frame mounting block is arranged on the headrest frame, and a slide groove hanging point matched with the headrest frame mounting block is arranged on the sliding end of the headrest.

[0013] The headrest frame is provided with a headrest positioning support, and the sliding end of the headrest is provided with a slide groove positioning support hole matched with the headrest positioning support.

[0014] A locking thrust plate support for supporting the locking thrust plate is arranged on the sliding end of the headrest.

[0015] Set the deformation force requirement of the top of the headrest to F, the deformation amount to ΔL, the distance between the center of the bushing and the top of the headrest to L1, and the upper and lower spans of the flexible bushing to L2;

[0016] Then, the bushing torque is: M = F * L1, assuming bushing stiffness K1 = K2,

[0017] Then the bushing deformation:

[0018]

[0019] Bushing deflection angle:

[0020]

[0021] Then the core bushing angular stiffness is:

[0022]

[0023] Since the bushing and the guide rail are rigidly connected, the deflection angle of the bushing is approximately equal to the deflection angle of the headrest, that is, the angular stiffness of the bushing is approximately equal to the angular stiffness of the headrest, so the angular stiffness of the headrest is:

[0024]

[0025] Combining formulas (3) and (4), the bushing stiffness can be obtained:

[0026]

[0027] Compared with the prior art, the beneficial effects of the present invention are: 1. Solving the problem of rapid disassembly and installation of the front wing part of the headrest and the problem of exposure of the headrest rod during the movement stroke.

[0028] 2. The flexible matching technology of square guide rails and slide grooves can realize the relative flexible sliding of the slide grooves and guide rails and the necessary clamping stiffness.

[0029] 3. The locking position slot and the gear point limit of the square guide rail can be integrated into the guide rail, saving the number of parts.

[0030] 4. The locking push plate support and the locking push plate buckle can be integrated into the plastic slide groove to withstand the upward and downward impact force of the locking mechanism and save the number of parts.

[0031] 5. The hanging points for installing the headrest frame can be integrated into the plastic slide, which not only saves the number of parts but also has sufficient span to maintain the angular stiffness of the headrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the headrest assembly of the present patent;

[0033] Figure 2 This is a schematic diagram of the headrest assembly of the patent from another angle;

[0034] Figure 3 This is a schematic diagram of the headrest skeleton of this patent;

[0035] Figure 4 This is a schematic diagram of the coordination between the fixed end and the sliding end of the headrest of the present patent;

[0036] Figure 5 This is a schematic diagram of the fixed end of the headrest of this patent;

[0037] Figure 6 This is a front view of the sliding end of the headrest of the present patent;

[0038] Figure 7 This is a schematic diagram of the back side of the sliding end of the headrest of the present patent;

[0039] Figure 8 This is a top view of the patented headrest unlocking mechanism and gear point;

[0040] Fig. 9 This is a schematic cross-sectional view of the square guide rail and the flexible bushing of the present patent;

[0041] Fig.10 This is a schematic diagram of the principle of the flexible bushing of this patent;

[0042] Fig.11 for Fig.10 Longitudinal cross-section of . DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-4 The present invention provides the following technical solutions: a square guide rail two-way hidden headrest, comprising a headrest fixed end 1, a headrest sliding end 2 and a headrest frame 3, the headrest frame 3 is installed on the headrest sliding end 2, the headrest fixed end 1 comprises a headrest guide rod 11, a mounting plate 14, and a square guide rail 12, the mounting plate 14 is fixed on the headrest guide rod 11, the square guide rail 12 is fixed on the mounting plate 14, slide rails 125 are arranged on both sides of the square guide rail 12, and a guide rail locking gear slot 121 is arranged in the middle, and slide grooves 21 are arranged on both sides of the headrest sliding end 2, and the headrest sliding end 2 passes through the slide grooves 21 Insert the slide rail 125, which is also provided with a flexible bushing 13. A locking thrust plate 22 is provided on the sliding end 2 of the headrest. A locking block 222 and a return spring 223 are provided on the locking thrust plate 22. One end of the return spring 223 is fixed to the locking block 222, and the other end is fixed to the sliding end 2 of the headrest. When the return spring 223 is not compressed, the locking block 222 is locked in the guide rail locking gear slot 121; push the locking thrust plate 22, the return spring 223 is compressed, and the locking block 222 comes out of the guide rail locking gear slot 121 to unlock.

[0045] The square guide rail 12 is provided with an upper gear point limit 122 and a lower gear point limit 124, a limit block 24 is fixed on the headrest sliding end 2, a limit stop point 241 is fixed on the limit block 24, and the limit stop point 241 is arranged between the upper and lower gear point limits and slides up and down with the headrest sliding end 2.

[0046] like Fig. 9 A flexible bushing 13 is provided between the slide rails 125 and the slide slot 21 on both sides, and the flexible bushing 13 includes a bushing deformation portion 131 and a bushing support portion 132. A bushing limiter 123 is provided on the slide rail 125. The flexible bushing 13 is clamped in the bushing limiter 123 through the convex point on it, so as to limit it laterally.

[0047] like Figure 8 The headrest sliding end 2 is provided with a locking thrust plate buckle 215, and the locking thrust plate 22 is clamped on the headrest sliding end 2 through the locking thrust plate buckle 215. The locking thrust plate 22 is relatively fixed on the headrest sliding end 2 through the locking thrust plate buckle 215, and the locking thrust plate 22 can be pushed by hand to slide left and right.

[0048] like Figure 3 , Figure 4 The headrest frame 3 is provided with a headrest quick release buckle 313, and the headrest sliding end 2 is provided with a slide slot quick release support 213 that cooperates with the headrest quick release buckle 313. The headrest frame 3 is provided with four headrest frame mounting blocks 311, and the headrest sliding end 2 is provided with four slide slot hanging points 211 that cooperate with the four headrest frame mounting blocks 311. The headrest frame 3 is provided with a headrest positioning support 312, and the headrest sliding end 2 is provided with a slide slot positioning support hole 212 that cooperates with the headrest positioning support 312.

[0049] The headrest sliding end 2 is provided with a locking thrust plate support 214 for supporting the locking thrust plate 22 .

[0050] The headrest is installed by the headrest frame mounting block 311 and the slide slot hanging point 211, and the headrest quick release buckle 313 is connected to the slide slot quick release support 213, so that the headrest can be quickly installed. The cooperation between the headrest positioning support 312 and the slide slot positioning support hole 212 can quickly position the headrest when it is installed, and at the same time provide a certain support strength.

[0051] After the headrest is installed, the locking block 222 on the locking push plate 22 is stuck in the guide rail locking gear slot 121, so that the headrest is locked and cannot be slid up and down for adjustment.

[0052] When the headrest needs to be adjusted up and down, the locking push plate 22 is pushed to drive the locking block 222 out of the guide rail locking gear slot 121, and the return spring 223 is compressed at the same time, and the locking block 222 is released from the guide rail locking gear slot 121 to complete the unlocking, and then the headrest sliding end 2 can be pushed to slide up and down along the slide slot 21 in the slide rail 125, so that the headrest can be adjusted up and down. After the adjustment is in place, the locking push plate 22 is released, and the compressed return spring 223 drives the locking block 222 to return to its original position, so that it is re-engaged in the guide rail locking gear slot 121, and the headrest is locked again.

[0053] When the headrest slides up and down, the limit block 24 on the sliding end 2 of the headrest plays a limiting role. The limit stop point 241 on the limit block 24 is located between the upper gear point limit 122 and the lower gear point limit 124. When the headrest slides to the uppermost end, the limit stop point 241 hits the upper gear point limit 122, and thus cannot be adjusted further upward. When the headrest slides to the lowermost end, the limit stop point 241 hits the lower gear point limit 124, and thus cannot be adjusted further downward, thereby ensuring safety during the adjustment process.

[0054] The flexible bushing 13 is installed between the slide rail 125 and the slide groove 21, and an interference fit is achieved through the flexible bushing deformation part 131 and the slide groove 21, and a contact fit is achieved between the flexible bushing deformation support and the square guide rail 12 through the bushing support part 132; the sliding operating force and relative stiffness of the slide groove 21 and the square guide rail 12 can be adjusted by adjusting the interference amount of the flexible bushing deformation part 131 and the span of the bushing support part 132.

[0055] like Fig.10 , Fig.11 , the force deformation requirement of the top of the headrest is set to F = 50N, the deformation ΔL = 3mm, the distance between the core center and the top of the headrest is L1 = 150mm, and the upper and lower spans of the flexible bushing are L2 = 50mm;

[0056] Then, the core torque is: M = F * L1 = 50N * 150mm = 7500N * mm = 7.5N * m

[0057] Assume the core bushing stiffness K1 = K2,

[0058] The deformation of the core bushing is:

[0059] Core bushing deflection angle:

[0060] Then the core bushing angular stiffness is:

[0061] Since the core bushing and the armrest are rigidly connected, the deflection angle of the core bushing is approximately equal to the deflection angle of the headrest, that is, the angular stiffness of the core is approximately equal to the angular stiffness of the headrest, and the angular stiffness of the headrest is:

[0062]

[0063] Combining formulas (3) and (4), the bushing stiffness can be obtained:

[0064] Therefore, it can be calculated that K1=K2=300000N / m=300N / mm.

[0065] Since K1 and K2 are provided by the left and right guide rails-bushings in this case, the stiffness requirement on each bushing is K1*0.5=150N / mm. (This completes the first step of this case. According to the deformation requirements of the headrest, the stiffness requirements of the headrest bushing are obtained.)

[0066] In particular, the bushing material is selected as POM, such as the connection technology of the square guide rail and bushing emphasized in this case. According to the elastic modulus of the material and the moment of inertia of the bushing deformation area, the stiffness of the flexible bushing can be calculated by setting a suitable span. For example:

[0067] The elastic modulus of the known material POM is: 4200Mpa

[0068] Flexible bushing deformation area thickness h = 1mm, width b = 12mm; flexible span l = 10mm

[0069] Then: I = 1 / 12*b*h3 = 1 / 12*12*10 -3 *1*1*1*10 -9 =1*10-12m 4

[0070] E*I=4.2*10 -3 N*m 2

[0071] P=100N

[0072] f=P*L 3 / (48*E*I)=(100*10*10*10*10 -9 ) / 48*4.2*10 -3

[0073] =100*10 -6 / 470.4*10 -3 =0.213*10 -3 m=0.496*mm

[0074] Then the bushing stiffness K = P / f = 201N / mm> 150N / mm, which meets the above requirements. (Thus, the second step of this case is completed, designing or selecting a flexible bushing with appropriate stiffness)

[0075] Furthermore, according to the friction coefficient of the guide rail-sleeve-slideway and the operating force requirement, the deformation amount f of the sleeve is adjusted to obtain a suitable sliding operating force. Since the aforementioned solution has locked the stiffness of the sleeve, a slight adjustment of the sliding force will not affect the stiffness of the headrest, and this patent will not elaborate on it.

[0076] Through the above method, the rigidity requirements of the square rail-bushing-slot can be determined according to the deformation rigidity requirements of the headrest, so as to design and develop a flexible bushing with appropriate rigidity (the material is not limited to POM, and should include other materials with good elasticity and low friction coefficient such as stainless steel sheets, etc.). In the case of locking the rigidity of the bushing, according to the formula of sliding friction force = normal pressure * dynamic friction coefficient, the appropriate operating force can be adjusted without affecting the rigidity of the headrest.

[0077] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A square rail two-way hidden headrest, characterized in that: The headrest comprises a headrest fixed end (1), a headrest sliding end (2) and a headrest frame (3), wherein the headrest frame (3) is mounted on the headrest sliding end (2), the headrest fixed end (1) comprises a headrest guide rod (11), a mounting plate (14) and a square guide rail (12), the mounting plate (14) is fixed on the headrest guide rod (11), the square guide rail (12) is fixed on the mounting plate (14), slide rails (125) are arranged on both sides of the square guide rail (12), a guide rail locking gear slot (121) is arranged in the middle, and slide grooves (25) are arranged on both sides of the headrest sliding end (2). 1), a headrest sliding end (2) is inserted into a slide rail (125) through a slide groove (21), a flexible bushing (13) is further provided in the slide rail (125), a locking push plate (22) is provided on the headrest sliding end (2), a locking block (222) and a return spring (223) are provided on the locking push plate (22), the locking block (222) is inserted into the guide rail locking gear slot (121) to lock; the locking push plate (22) is pushed, the return spring (223) is compressed, and the locking block (222) comes out of the guide rail locking gear slot (121) to unlock.

2. A square rail up and down two-way hidden headrest according to claim 1, characterized in that: An upper gear point limit (122) and a lower gear point limit (124) are arranged on the square guide rail (12); a limit block (24) is fixed on the headrest sliding end (2); a limit stop point (241) is arranged on the limit block (24); the limit stop point (241) is arranged between the upper and lower gear point limits and slides up and down along with the headrest sliding end (2).

3. A square rail up and down two-way hidden headrest according to claim 1, characterized in that: The flexible bushing (13) is arranged between the slide rail (125) and the slide groove (21), and the flexible bushing (13) comprises a bushing deformation portion (131) and a bushing support portion (132).

4. A square rail up and down two-way hidden headrest according to claim 3, characterized in that: The slide rail (125) is provided with a bushing limiter (123).

5. The square rail up and down two-way hidden headrest according to claim 1, characterized in that: A locking thrust plate buckle (215) is provided on the headrest sliding end (2), and the locking thrust plate (22) is clamped on the headrest sliding end (2) via the locking thrust plate buckle (215).

6. The square rail up and down two-way hidden headrest according to claim 1, characterized in that: The headrest frame (3) is provided with a headrest quick-release buckle (313), and the headrest sliding end (2) is provided with a slide slot quick-release support (213) that cooperates with the headrest quick-release buckle (313).

7. The square rail up and down two-way hidden headrest according to claim 1, characterized in that: The headrest frame (3) is provided with a headrest frame mounting block (311), and the headrest sliding end (2) is provided with a slide groove hanging point (211) matched with the headrest frame mounting block (311).

8. The square rail up and down two-way hidden headrest according to claim 1, characterized in that: The headrest frame (3) is provided with a headrest positioning support (312), and the headrest sliding end (2) is provided with a slide groove positioning support hole (212) that cooperates with the headrest positioning support (312).

9. The square rail up and down two-way hidden headrest according to claim 1, characterized in that: A locking thrust plate support (214) for supporting a locking thrust plate (22) is provided on the headrest sliding end (2).

10. The square rail up and down two-way hidden headrest according to claim 1, characterized in that: Set the deformation force requirement of the top of the headrest to F, the deformation amount to ΔL, the distance between the center of the bushing and the top of the headrest to L1, and the upper and lower spans of the flexible bushing to L2; Then, the bushing torque is: M = F * L1, assuming bushing stiffness K1 = K2, Then the bushing deformation: Bushing deflection angle: Then the core bushing angular stiffness is: Since the bushing and the guide rail are rigidly connected, the deflection angle of the bushing is approximately equal to the deflection angle of the headrest, that is, the angular stiffness of the bushing is approximately equal to the angular stiffness of the headrest, so the angular stiffness of the headrest is: Combining formulas (3) and (4), the bushing stiffness can be obtained:

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