Headrest with square guide rail hidden in vertical direction

Abstract

The utility model discloses a square guide rail up-down two-way hidden type headrest, which comprises a headrest fixed end, a headrest sliding end and a headrest framework, the headrest framework is arranged 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, 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 utility model, 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 utility model belongs to the field of automobile interior decoration, and particularly 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 rod is 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 subsequent use and maintenance, it is also necessary to design and develop a mechanism to ensure the quick installation and removal 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 headrest's up and down stroke.

[0003] For example, CN216231852U discloses a novel mounting method for a car seat headrest, comprising a headrest frame and a headrest base, belonging to the field of automotive components. This design allows for vertical adjustment of the headrest and secures the headrest frame to the car seat back frame by aligning a clip with a slot during assembly. However, due to the enclosed nature of the circular bushing and guide rod, the mounting clip has a very small span in the vertical and, in particular, horizontal directions, making it difficult to ensure adequate mounting rigidity for the headrest frame.

[0004] Another example is CN216833351U, a utility model that discloses a suspended, adjustable headrest. This design not only provides a suspended headrest but also allows for height adjustment, offering simple operation and high adjustment efficiency. However, due to the enclosed nature of the circular bushing and guide rod, while this structure maintains a sufficient vertical range, the vertical span of the fixed portion of the headrest's front structure is limited. Utility Model Content

[0005] In order to solve the above problems existing in the prior art, the utility model 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 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 utility model provides the following technical solutions: a square guide rail with 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 provided on both sides of the square guide rail, a guide rail locking gear slot is provided in the middle, slide slots are provided on both sides of the sliding end of the headrest, the headrest sliding end is inserted into the guide rail through the slide slot, and a flexible bushing is also provided in the slide rail, a locking push plate is provided on the sliding end of the headrest, a locking block and a return spring are provided on the locking push plate, and the locking block is locked in the guide rail locking gear slot; 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 set 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 includes 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 that cooperates with the headrest quick-release buckle.

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

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

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

[0015] Set the deformation force requirement of the headrest top to F, the deformation amount to ΔL, the distance between the bushing center and the headrest top 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 bushing's deflection angle is approximately equal to the headrest's deflection angle, that is, the bushing's angular stiffness is approximately equal to the headrest's angular stiffness. Therefore, the headrest's angular stiffness 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. It solves 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 realizes the relative flexible sliding of slide grooves and guide rails and the necessary clamping rigidity.

[0029] 3. The locking position slot and 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, which can withstand the upward and downward impact forces 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 this patent;

[0033] Figure 2 This is a schematic diagram of the patented headrest assembly 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 this 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 patented headrest;

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

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

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

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

[0042] Figure 11 for Figure 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0044] See also Figure 1-4 The utility model provides the following technical solutions: a square guide rail up and down two-way hidden headrest, including 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 includes a headrest guide rod 11, a mounting plate 14, 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 set on both sides of the square guide rail 12, and a guide rail locking gear slot 121 is set in the middle, and slide grooves 21 are set on both sides of the headrest sliding end 2, and the headrest sliding end 2 passes through the slide grooves 2 1 is inserted into the guide rail 125, and a flexible bushing 13 is also provided in the guide 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. One end of the return spring 223 is fixed to the locking block 222, and the other end is fixed to the headrest sliding end 2. When the return spring 223 is not compressed, the locking block 222 is locked in the guide rail locking gear groove 121; when 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 groove 121 to be unlocked.

[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, and a limit stop point 241 is fixed on the limit block 24. The limit stop point 241 is set between the upper and lower gear point limits and slides up and down with the headrest sliding end 2.

[0046] like Figure 9 A flexible bushing 13 is provided between the slide rails 125 and the slide groove 21 on both sides. 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 by the protrusions on it, thereby limiting its lateral position.

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

[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 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 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 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 coupling the headrest frame mounting block 311 with the slideway attachment point 211. Meanwhile, the headrest quick-release buckle 313 snaps onto the slideway quick-release support 213, enabling quick installation of the headrest. The headrest positioning support 312 cooperates with the slideway positioning support hole 212 to quickly position the headrest during installation while providing a certain level of 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 or down, the locking push plate 22 is pushed, driving the locking block 222 out of the guide rail locking gear slot 121. At the same time, the return spring 223 is compressed, and the locking block 222 is released from the guide rail locking gear slot 121 to complete the unlocking. Then, the headrest sliding end 2 can be pushed up and down along the slide groove 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 back 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 and is adjusted to the upper end, the limit stop point 241 hits the upper gear point limit 122, and thus cannot be adjusted further upward. When the headrest slides and is adjusted to the lower 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 the flexible bushing deformation support and the square guide rail 12 are contact-fitted through the bushing support part 132; by adjusting the interference amount of the flexible bushing deformation part 131 and the span of 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.

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

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

[0057] Assume that 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 rail bushings in this case, the stiffness requirement for each bushing is K1*0.5=150N / mm. (This completes the first step of this case study. Based on the deformation requirements of the headrest, the stiffness requirements for the headrest bushing are obtained.)

[0066] In particular, if the bushing material is POM, as in the connection technology of the square guide rail and bushing emphasized in this case, the stiffness of the flexible bushing can be calculated by setting an appropriate span based on the elastic modulus of the material and the moment of inertia of the bushing deformation area. 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] The bushing stiffness K = P / f = 201 N / mm > 150 N / mm, meeting the aforementioned requirements. (This completes the second step of this case: designing or selecting a flexible bushing with appropriate stiffness.)

[0075] Furthermore, the bushing deformation f is adjusted based on the friction coefficient of the guide rail, bushing, and slideway and the required operating force to achieve the appropriate sliding operating force. Since the aforementioned solution has already locked the bushing's stiffness, a slight adjustment in the sliding force does not affect the stiffness of the headrest and is not discussed in detail in this patent.

[0076] The above method can be used to determine the stiffness requirements of the square rail, bushing, and slideway based on the headrest's deformation stiffness requirements, thereby designing and developing a flexible bushing with appropriate stiffness (materials are not limited to POM and can include other materials with good elasticity and low friction coefficients, such as stainless steel). By locking the bushing stiffness, the formula (sliding friction force = normal pressure * kinetic friction coefficient) allows for adjusting the appropriate operating force without affecting the stiffness of the headrest.

[0077] Finally, it should be noted that the above are merely 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 will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A square guide rail two-way hidden headrest, characterized in that: The invention 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), wherein 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 (25) are arranged on both sides of the headrest sliding end (2). 1), the headrest sliding end (2) is inserted into the slide rail (125) through the 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), and the locking block (222) is locked in the guide rail locking gear slot (121); 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 guide rail up and down two-way hidden headrest according to claim 1, characterized in that: An upper shift point limit (122) and a lower shift point limit (124) are provided on the square guide rail (12); a limit block (24) is fixed on the headrest sliding end (2); a limit stop point (241) is provided on the limit block (24); the limit stop point (241) is provided between the upper and lower shift point limits and slides up and down along with the headrest sliding end (2).

3. The square guide 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: A bushing limiter (123) is provided on the slide rail (125).

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

6. The square guide 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 groove quick-release support (213) that cooperates with the headrest quick-release buckle (313).

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

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

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

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