A stepless four-way headrest adjustment mechanism

Abstract

The present invention relates to a steplessly adjustable four-way headrest adjustment mechanism, comprising an outer shell, an inverted U-shaped support frame installed inside the outer shell, a lifting frame being fitted in the middle parts of two arms of the support frame, a slider assembly being slidably installed through the lifting frame front and back, and two ends of the slider assembly being respectively fixed to the wall surfaces opposite to the outer shell; a rotation-linear conversion mechanism is installed between the lifting frame and the support frame; and a locking mechanism is also included, which locks the sliding of the slider assembly and the rotation of a rotating member in the rotation-linear conversion mechanism; force is applied to a button so that the horizontal locking mechanism releases the forward and backward movement freedom of the slider assembly downward, and the lifting locking mechanism releases the rotation freedom of the rotating member, and when an up-down or forward-backward force is applied to the outer shell, the slider assembly moves forward and backward with the outer shell relative to the lifting frame, and the lifting frame moves up and down with the slider assembly and the outer shell relative to the support frame, thereby realizing stepless adjustment of the headrest in four directions, which is simple, convenient and fast, has good practicality, and greatly improves user experience.

Description

Technical Field

[0001] The invention relates to the technical field of seat headrests, in particular to a steplessly adjustable four-way headrest adjustment mechanism. Background Art

[0002] As an important configuration in automobile safety, the quality of the headrest is not only related to the comfort of the driver and passengers, but also supports the cervical vertebrae of the passengers in the event of a severe vehicle collision, effectively protecting the cervical vertebrae and even life safety; therefore, the comfort level, height and position matching of the headrest are crucial.

[0003] In the prior art, headrests are adjustable in four directions: up and down, front and back, to match the height of the driver's head and the front and back fit; however, the existing headrest adjustment mechanism has a cumbersome structure, is troublesome and laborious to unlock, and can only be adjusted within a limited number of gears, resulting in a low match with the user's head and inconvenience in use. Summary of the invention

[0004] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a four-way headrest adjustment mechanism with a rational structure and stepless adjustment, thereby realizing stepless adjustment of the headrest in four directions. The adjustment is simple, the use is convenient, the practicality is good, and the user experience is greatly improved and the comfort is enhanced.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A four-way headrest adjustment mechanism with stepless adjustment comprises an outer shell, an inverted U-shaped support frame is installed inside the outer shell, a lifting frame is commonly mounted on the middle parts of the two arms of the support frame, a slider assembly is slidably installed through the lifting frame front and back, and the two ends of the slider assembly are respectively fixed to the two wall surfaces opposite to the outer shell; a rotation-linear conversion mechanism is installed between the lifting frame and the support frame; and a locking mechanism is also included, which simultaneously locks the sliding of the slider assembly and the rotation of the rotating part in the rotation-linear conversion mechanism.

[0007] As a further improvement of the above technical solution:

[0008] The structure of the locking mechanism is as follows: it includes a button component that passes through the side wall of the outer shell, the inner end of the button component extends into the outer shell, the front end of the button component located in the outer shell is connected to a push block, the inner side of the push block is fixedly installed with a transmission plate, the transmission plate is located inside the lifting frame, and the end of the transmission plate is installed with a horizontal locking mechanism, and the top of the horizontal locking mechanism is clamped and matched with the slider component; a lifting locking mechanism is installed between the rear of the lifting frame and the support frame, and the lifting locking mechanism is engaged and clamped with the rotating member.

[0009] The rotating member is a screw rod, which is rotatably mounted on the support frame; an axially vertical nut is fixed on the lifting frame, and the screw rod and the nut helical pair cooperate to form a rotation-linear conversion mechanism;

[0010] The structure of the lifting locking mechanism is as follows: it includes a middle cross beam and a lever arranged up and down, the middle cross beam is fixedly installed between the two side arms of the support frame below the lifting frame, and a rotating shaft is installed at the middle part of the middle cross beam and the middle part of the lever at the same time; an axially vertical internal spline is installed at one end of the lever, and a cable is clamped at the other end of the lever, and the cable passes through the middle cross beam upward and then goes around to the front of the lifting frame; a lug is extended forward from the middle part of the transmission plate through the lifting frame, and the lug is fixedly connected to the front end of the cable; the bottom end of the screw rod is circumferentially arranged with an external spline, and after the screw rod passes through the middle cross beam downward, the external spline at the bottom end of the screw rod is matched with the internal spline.

[0011] The rotating member is a gear, which is rotatably mounted on the side wall of the lifting frame; a toothed structure is arranged on the vertical arm wall of the support frame along the axial direction, and the gear meshes with the toothed structure to form a rotation-linear conversion mechanism;

[0012] The structure of the lifting and locking mechanism is as follows: it includes a supporting shaft extending from the side wall of the lifting frame toward the push block, and a gear is rotatably mounted on the end of the supporting shaft; a locking shaft extends from the inner side of the push block, and the axial direction of the locking shaft is located on the same straight line as the axial direction of the supporting shaft and the gear, and a spline structure is arranged at the end of the locking shaft; a spline hole and an axial hole are arranged in sequence along the axial direction through the axis of the gear, the spline hole is meshed with the spline structure of the locking shaft, and the axial hole is rotatably connected with the outer wall of the supporting shaft; a blind hole for accommodating the spline structure is also opened at the center of the end of the supporting shaft.

[0013] The structure of the horizontal locking mechanism is as follows: it includes an inclined wedge block of a frame-type structure, the inner bottom surface of the inclined wedge block is set as a lower inclined surface, the end of the transmission plate is clamped with an upper wedge block, and the upper wedge block is provided with an upper inclined surface that matches the lower inclined surface of the inclined wedge block; the top of the inclined wedge block penetrates the bottom wall surface of the guide sleeve in the slider assembly upward, the top surface of the inclined wedge block is engaged with the bottom surface of the slider in the slider assembly, a bottom cover is installed on the bottom surface of the lifting frame below the inclined wedge block, and an elastic body 1 is installed between the bottom surface of the inclined wedge block and the bottom cover.

[0014] The structure of the button assembly is as follows: it includes a button sleeve that penetrates the side wall of the outer shell inside and outside and is fixed, a button is installed along the axial direction through the button sleeve, and the inner end of the button is clamped with the button sleeve through a barb; the push block is installed between the end of the transmission plate and the inner end of the button, the side surface of the push block is clamped and fixedly connected with the end of the transmission plate, an elastomer 2 is installed between the push block and the lifting frame, and an elastomer 3 is installed between the step of the inner wall of the button sleeve and the button.

[0015] The structure of the lifting frame is as follows: it includes a front frame and a rear frame arranged front and back, and the front frame and the rear frame are clamped and fixedly connected as a whole; a space for accommodating a transmission plate and a horizontal locking mechanism is formed between the front frame and the rear frame, and the rear frame is contained inside the front frame.

[0016] The structure of the support frame is as follows: it includes a support rod with an inverted U-shaped structure, an upper crossbeam is fixedly installed below the horizontal arm at the top of the support rod, sleeves are installed between the two vertical arms of the support rod and the lifting frame, and a middle crossbeam is fixedly installed between the two vertical arms of the support rod located below the sleeve; the bottoms of the two vertical arms of the support rod are fixed to the external seat.

[0017] The structure of the slider assembly is as follows: it includes a slider, which is circumferentially covered with a guide sleeve; the guide sleeve passes through the lifting frame front and back, and the guide sleeve is fixed to the lifting frame; guide rods are symmetrically passed through the lifting frame located outside the two sides of the slider, and the two end heads of the guide rods located on the front and rear sides of the lifting frame are respectively fixed to the inner wall of the shell; a through hole is opened on the bottom surface of the guide sleeve, and the bottom surface of the slider is provided with teeth in the left and right directions.

[0018] The structure of the outer shell is as follows: it includes a front half shell and a rear half shell arranged front and back, and the edges of the front half shell and the rear half shell are clamped together to form an outer shell with an integrated structure; the two ends of the slider assembly are respectively fixed to the inner side surfaces opposite to the front half shell and the rear half shell; the bottom surface of the rear half shell is provided with a strip groove for the two arms of the support frame to pass through and slide relatively forward and backward.

[0019] The beneficial effects of the present invention are as follows:

[0020] The invention has a compact and reasonable structure and is easy to operate. By applying force to the button, the push block and the transmission plate are pushed to move horizontally, and the horizontal locking mechanism is moved downward through the cooperation of the inclined wedge to release the forward and backward movement freedom of the slider assembly, and the lifting locking mechanism is pulled by the cable to release the rotational freedom of the screw rod, or the rotational freedom of the gear is released through the locking shaft; then, an up and down or front and back lateral force is applied to the outer shell, the slider assembly moves forward and backward with the outer shell relative to the lifting frame, and the lifting frame moves up and down with the slider assembly and the outer shell relative to the support frame, and the screw rod or the gear rotates, thereby realizing stepless adjustment of the headrest in four directions. It is simple and quick, greatly improves the user experience, improves the comfort, and effectively ensures the safety of the cervical spine, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of the present invention (the outer shell is omitted).

[0023] Figure 3 for Figure 2 Exploded diagram.

[0024] Figure 4 It is a schematic diagram of the structure of the present invention (outer shell omitted, another viewing angle, embodiment 1).

[0025] Figure 5 It is a schematic diagram of the structure of the present invention (outer shell omitted, another viewing angle, embodiment 2).

[0026] Figure 6 Exploded view of the lifting and locking mechanism of the present invention (Example 2).

[0027] Figure 7 It is a schematic diagram of the structure of the gear of the present invention.

[0028] Figure 8 It is a schematic diagram of the structure between the inclined wedge block, the guide sleeve and the sliding block of the present invention.

[0029] Among them: 1. outer shell; 2. button assembly; 3. support frame; 4. transmission plate; 5. slider assembly; 6. lifting frame; 7. screw rod; 8. horizontal locking mechanism; 9. lifting locking mechanism; 11. front half shell; 12. rear half shell; 21. push block; 22. elastic body 2; 23. button cover; 24. elastic body 3; 25. button; 31. upper crossbeam; 32. sleeve; 33. middle crossbeam; 34. support rod; 41. Lug; 51, slider; 52, guide sleeve; 53, guide rod; 61, rear frame; 62, front frame; 81, upper wedge; 82, inclined wedge; 83, elastic body 1; 84, bottom cover; 91, cable; 92, nut; 93, internal spline; 94, lever; 95, rotating shaft; 96, supporting shaft; 97, gear; 98, locking shaft; 99, toothed structure; 961, blind hole; 971, shaft hole; 972, spline hole. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0031] like Figure 1 and Figure 2As shown, a stepless four-way headrest adjustment mechanism of this embodiment includes an outer shell 1, an inverted U-shaped support frame 3 is installed inside the outer shell 1, a lifting frame 6 is commonly mounted on the middle of the two arms of the support frame 3, a slider assembly 5 is slidably installed through the lifting frame 6 front and back, and the two ends of the slider assembly 5 are respectively fixed to the two opposite walls of the outer shell 1; a rotation-linear conversion mechanism is installed between the lifting frame 6 and the support frame 3; and a locking mechanism is also included, which simultaneously locks the sliding of the slider assembly 5 and the rotation of the rotating member in the rotation-linear conversion mechanism; the slider assembly is locked by the locking mechanism After the sliding of 5 and the rotation of the rotating member are unlocked, when the front and rear lateral forces are applied to the outer shell 1, the slider assembly 5 moves forward and backward with the outer shell 1 relative to the lifting frame 6, so that the outer shell 1, that is, the headrest, can be adjusted forward and backward; when the up and down forces are applied to the outer shell 1, the lifting frame 6 moves up and down with the slider assembly 5 and the outer shell 1 relative to the support frame 3, and the rotating member rotates, so that the outer shell 1, that is, the headrest, can be adjusted up and down; after the up and down or front and back adjustments are in place, the locking mechanism locks the rotation of the slider assembly 5 and the rotating member, and then the position cannot be adjusted by applying force on the outer shell 1.

[0032] like Figure 3 As shown, the structure of the locking mechanism is as follows: it includes a button assembly 2 that passes through the side wall of the outer shell 1, the inner end of the button assembly 2 extends into the outer shell 1, and the front end of the button assembly 2 located in the outer shell 1 is connected to a push block 21, and a transmission plate 4 is fixedly installed on the inner side of the push block 21. The transmission plate 4 is located inside the lifting frame 6, and a horizontal locking mechanism 8 is installed at the end of the transmission plate 4. The top of the horizontal locking mechanism 8 is clamped and matched with the slider assembly 5 to lock the forward and backward movement freedom of the slider assembly 5; a lifting locking mechanism 9 is installed between the rear of the lifting frame 6 and the support frame 3, and the lifting locking mechanism 9 is engaged and clamped with the rotating part to lock the rotational freedom of the rotating part, thereby limiting the lifting freedom of the lifting frame 6.

[0033] The structure of the horizontal locking mechanism 8 is as follows: it includes an inclined wedge block 82 of a frame-type structure, the inner bottom surface of the inclined wedge block 82 is set as a lower inclined surface, the end of the transmission plate 4 is clamped with an upper wedge block 81, and the upper wedge block 81 is provided with an upper inclined surface that matches the lower inclined surface of the inclined wedge block 82; the top of the inclined wedge block 82 penetrates the bottom wall surface of the guide sleeve 52 in the slider assembly 5 upward, and the top surface of the inclined wedge block 82 is engaged with the bottom surface of the slider 51 in the slider assembly 5 in a toothed manner, and a bottom cover 84 is installed on the bottom surface of the lifting frame 6 located below the inclined wedge block 82, and an elastic body 83 is installed between the bottom surface of the inclined wedge block 82 and the bottom cover 84.

[0034] The structure of the button assembly 2 is: it includes a button sleeve 23 that penetrates the side wall of the outer shell 1 inside and outside and is fixed, and a button 25 is installed along the axial direction through the button sleeve 23, and the inner end of the button 25 is clamped with the button sleeve 23 through a barb; the push block 21 is installed between the end of the transmission plate 4 and the inner end of the button 25, and the side of the push block 21 is clamped and fixedly connected with the end of the transmission plate 4, an elastic body 22 is installed between the push block 21 and the lifting frame 6, and an elastic body 3 24 is installed between the step of the inner wall of the button sleeve 23 and the button 25.

[0035] The structure of the lifting frame 6 is as follows: it includes a front frame 62 and a rear frame 61 arranged front and back, and the front frame 62 and the rear frame 61 are clamped and fixedly connected as a whole; a space for accommodating the transmission plate 4 and the horizontal locking mechanism 8 is formed between the front frame 62 and the rear frame 61, and the rear frame 61 is contained inside the front frame 62.

[0036] The structure of the support frame 3 is as follows: it includes a support rod 34 of an inverted U-shaped structure, an upper crossbeam 31 is fixedly installed below the top horizontal arm of the support rod 34, sleeves 32 are installed between the two vertical arms of the support rod 34 and the lifting frame 6, and a middle crossbeam 33 is fixedly installed between the two vertical arms of the support rod 34 located below the sleeve 32; the bottom of the two vertical arms of the support rod 34 is fixed to the external seat.

[0037] The structure of the slider assembly 5 is as follows: it includes a slider 51, and the slider 51 is circumferentially sleeved with a guide sleeve 52; the guide sleeve 52 penetrates the lifting frame 6 front and back, and the guide sleeve 52 is fixed to the lifting frame 6; the lifting frames 6 located outside the slider 51 on both sides are symmetrically penetrated by guide rods 53, and the two ends of the guide rods 53 located on the front and rear sides of the lifting frame 6 are respectively fixed to the inner wall surface of the outer shell 1; the bottom surface of the guide sleeve 52 is provided with a through hole, and the bottom surface of the slider 51 is provided with a tooth profile in the left and right directions. After the top of the inclined wedge block 82 in the horizontal locking mechanism 8 penetrates from bottom to top into the guide sleeve 52 through the through hole, the top surface of the inclined wedge block 82 is engaged with the tooth profile of the bottom surface of the slider 51, as shown in FIG. Figure 8 shown.

[0038] The structure of the outer shell 1 is as follows: it includes a front half shell 11 and a rear half shell 12 arranged front and back, and the edges of the front half shell 11 and the edges of the rear half shell 12 are fitted together to form an outer shell 1 of an integrated structure; the two ends of the slider assembly 5 are fixed to the inner side surfaces opposite to the front half shell 11 and the rear half shell 12 respectively; the bottom surface of the rear half shell 12 is provided with a strip groove for the two arms of the support frame 3 to pass through and slide relatively forward and backward.

[0039] Embodiment 1:

[0040] like Figure 3 and Figure 4 As shown, the rotating member is a screw rod 7, which is rotatably mounted on the upper cross beam 31 and the middle cross beam 33 of the support frame 3; an axially vertical nut 92 is fixedly mounted on the lifting frame 6, and the screw rod 7 and the nut 92 helical pair cooperate to form a rotation-linear conversion mechanism;

[0041] The structure of the lifting locking mechanism 9 is as follows: it includes a middle cross beam 33 and a lever 94 arranged up and down, the middle cross beam 33 is fixedly installed between the two side arms of the support frame 3 below the lifting frame 6, and a rotating shaft 95 is installed through the middle part of the middle cross beam 33 and the middle part of the lever 94 at the same time; an axially vertical internal spline 93 is installed at one end of the lever 94, and a cable 91 is clamped at the other end of the lever 94, and the cable 91 passes through the middle cross beam 33 upward and then goes around to the front of the lifting frame 6; a lug 41 extends forward from the middle part of the transmission plate 4 through the lifting frame 6, and the lug 41 is fixedly connected to the front end of the cable 91; the bottom end of the screw rod 7 is circumferentially arranged with an external spline, and after the screw rod 7 passes through the middle cross beam 33 downward, the external spline at the bottom end of the screw rod 7 is matched with the internal spline 93.

[0042] The working principle of the first embodiment is as follows:

[0043] Step 1: Press the button 25 on the side of the outer shell 1, the button 25 moves inward relative to the button sleeve 23, and the elastic body 3 24 is compressed; the inner end of the button 25 contacts and pushes the push block 21 to move, the elastic body 2 22 is compressed, and the transmission plate 4 moves with the push block 21;

[0044] Step 2: The upper wedge 81 at the end of the transmission plate 4 moves and applies a downward force to the inclined wedge 82 through the inclined surface; the inclined wedge 82 moves downward, and its top part is separated from the slider 51, thereby releasing the freedom of the slider 51 to slide forward and backward along the guide sleeve 52, and the elastic body 83 is compressed; synchronously, the lug 41 on the side of the transmission plate 4 pulls the end of the cable 91, and the end of the lever 94 is pulled upward through the cable 91, and the lever 94 rotates relative to the middle cross beam 33 with the rotating shaft 95 as the center of the circle, and the other end of the lever 94 swings downward, driving the internal spline 93 downward, and the internal spline 93 is separated from the bottom end of the screw rod 7, thereby releasing the rotational freedom of the screw rod 7, that is, the lifting freedom of the lifting frame 6 that is spirally matched with the screw rod 7 is released through the nut 92;

[0045] Step 3: Apply a front-to-back lateral force to the outer shell 1, and the slider 51 in the slider assembly 5 and the outer shell 1 move forward and backward relative to the guide sleeve 52 on the lifting frame 6, and the cooperation between the guide rod 53 and the lifting frame 6 plays a guiding role, so that the front-to-back position adjustment of the outer shell 1, that is, the headrest is achieved;

[0046] Step 4: Apply up-and-down forces to the outer shell 1, and the lifting frame 6, the slider assembly 5 and the outer shell 1 move up and down relative to the support frame 3 with the two arms of the support rod 34 as guides, and the screw rod 7 spirally matched with the lifting frame 6 rotates to achieve the up-and-down position adjustment of the outer shell 1, i.e., the headrest;

[0047] Step 5: After the front and rear and up and down positions are adjusted to the right position, the force applied to the button 25 is released, and under the action of the compressed elastic body 22 and the elastic body 3 24, the button 25 and the push block 21 are reset, and the transmission plate 4 is reset along with the push block 21;

[0048] Step 6: The upper wedge block 81 is reset along with the transmission plate 4. Under the action of the compressed elastic body 83, the inclined wedge block 82 is reset and moves upward, and then the top of the inclined wedge block 82 is re-extended into the guide sleeve 52 of the slider assembly 5 and cooperates with the tooth profile of the slider 51, limiting the freedom of the slider 51 to move forward and backward;

[0049] Step 7: The transmission plate 4 is reset, and the end of the cable 91 connected to the transmission plate 4 is reset, releasing the force of the other end of the cable 91 pulling the lever 94, and the lever 94 is reversely rotated relative to the middle cross beam 33 with the rotating shaft 95 as the center. The other end of the lever 94 moves upward, so that the internal spline 93 of the end is re-fitted to the bottom end of the screw rod 7 and matched with the external spline, limiting the rotational freedom of the screw rod 7, and then limiting the lifting freedom of the nut 92 matched with the screw rod 7, and limiting the lifting freedom of the lifting frame 6;

[0050] Step 8: Complete the front, back, and up and down adjustments of the headrest.

[0051] Embodiment 2:

[0052] like Figure 5 and Figure 6 As shown, the rotating part is a gear 97, which is rotatably installed on the side wall of the lifting frame 6; a toothed structure 99 is axially arranged on the wall surface of the vertical arm of the support frame 3, that is, a toothed structure 99 is arranged on the back side of the vertical arm of the support rod 34 close to the button assembly 2, and the gear 97 is meshed with the toothed structure 99 to form a rotation-linear conversion mechanism; a hole is opened on the sleeve 32 opposite to the toothed structure 99, so that the toothed structure 99 is exposed from the sleeve 32 and meshed with the gear 97 outside the sleeve 32.

[0053] The structure of the lifting locking mechanism 9 is as follows: it includes a support shaft 96 extending from the side wall of the rear frame 61 of the lifting frame 6 toward the push block 21, and a gear 97 is rotatably mounted on the end of the support shaft 96; a locking shaft 98 extends from the inner side of the push block 21, and the axial direction of the locking shaft 98 is located on the same straight line as the axial direction of the support shaft 96 and the gear 97, and a spline structure is arranged at the end of the locking shaft 98; a spline hole 972 and an axis hole 971 are sequentially arranged along the axial direction through the axis of the gear 97, such as Figure 7 As shown, the spline hole 972 is meshed with the spline structure of the locking shaft 98, and the shaft hole 971 is rotatably connected to the outer wall of the supporting shaft 96; a blind hole 961 for accommodating the spline structure is also opened at the center of the end of the supporting shaft 96.

[0054] The working principle of the second embodiment is as follows:

[0055] Except that the principle of the lifting and locking mechanism 9 is different from that of the first embodiment, the rest are the same, that is, referring to the working principle of the first embodiment, wherein the second step, the fourth step and the seventh step are different, and are described as follows:

[0056] Step 2: The release of the sliding freedom of the slider 51 in the slider assembly 5 along the guide sleeve 52 is the same as in the first embodiment; synchronously, the locking shaft 98 moves with the push block 21, and the spline structure of the end of the locking shaft 98 and the spline hole 972 of the gear 97 is pushed into the blind hole 961 of the support shaft 96, and the rotational freedom of the gear 97 is released, so that the support frame 3 and the lifting frame 6 can move linearly relative to each other through the gear 97 and the tooth structure 99, that is, the lifting freedom of the lifting frame 6 relative to the support frame 3 is released;

[0057] Step 4: Apply vertical force to the outer shell 1, the lifting frame 6, the slider assembly 5 and the outer shell 1 move up and down relative to the support frame 3 with the two arms of the support rod 34 as the guide, and the gear 97 meshing with the toothed structure 99 of the vertical arm of the support rod 34 rotates relative to the support shaft 96 and the lifting frame 6, so as to adjust the vertical position of the outer shell 1, i.e., the headrest;

[0058] Step 7: The locking shaft 98 is reset along with the push block 21, and the spline structure at the end of the locking shaft 98 moves from the blind hole 961 of the supporting shaft 96 to the spline hole 972 of the gear 97, that is, the locking shaft 98 is re-matched with the gear 97 to lock the rotation, thereby limiting the upward and downward movement freedom of the lifting frame 6 relative to the supporting frame 3.

[0059] By applying force to the button 25, the push block 21 and the transmission plate 4 are pushed to move horizontally, and the horizontal locking mechanism 8 is moved downward through the cooperation of the inclined wedge to release the forward and backward movement freedom of the slider assembly 5, and the lifting locking mechanism 9 is pulled through the cable 91 to release the rotational freedom of the screw rod 7, or the rotational freedom of the gear 97 is released through the locking shaft 98; then, an up and down or front and back lateral force is applied to the outer shell 1, the slider assembly 5 moves forward and backward with the outer shell 1 relative to the lifting frame 6, the lifting frame 6 moves up and down with the slider assembly 5 and the outer shell 1 relative to the support frame 3, and the screw rod 7 or the gear 97 rotates, thereby realizing stepless adjustment of the headrest in four directions.

[0060] The structure of the present invention is compact, reasonable and ingenious, and the stepless adjustment of the headrest in four directions is realized. The operation is simple and convenient, which greatly improves the customer's use experience, improves the comfort and ensures the safety of the cervical spine.

[0061] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A steplessly adjustable four-way headrest adjustment mechanism, comprising an outer shell (1), characterized in that: The outer shell (1) is internally mounted with an inverted U-shaped support frame (3), the middle parts of the two arms of the support frame (3) are jointly fitted with a lifting frame (6), a slider assembly (5) is slidably mounted through the lifting frame (6) at the front and rear, and the two ends of the slider assembly (5) are respectively fixed to the two opposite wall surfaces of the outer shell (1); a rotation-linear conversion mechanism is installed between the lifting frame (6) and the support frame (3); and a locking mechanism is also included, the locking mechanism simultaneously locking the sliding of the slider assembly (5) and the rotation of the rotating member in the rotation-linear conversion mechanism; the structure of the locking mechanism is as follows: it includes a button assembly (2) that penetrates the side wall of the outer shell (1), the inner end of the button assembly (2) extends into the outer shell (1), and is located in the outer shell (1) ) is connected to the front end of the button assembly (2) in the lifting frame (6) and is installed with a push block (21). The inner side of the push block (21) is fixedly installed with a transmission plate (4). The transmission plate (4) is located inside the lifting frame (6). The end of the transmission plate (4) is installed with a horizontal locking mechanism (8). The top of the horizontal locking mechanism (8) is snap-fitted with the slider assembly (5); a lifting locking mechanism (9) is installed between the rear of the lifting frame (6) and the support frame (3). The lifting locking mechanism (9) is snap-fitted with the rotating member; the rotating member is a screw rod (7), and the screw rod (7) is rotatably installed on the support frame (3); an axially vertical nut (92) is fixedly installed on the lifting frame (6), and the screw rod (7) and the nut (92) are screwed together to form a rotation-linear conversion mechanism; The structure of the lifting locking mechanism (9) is as follows: it comprises a middle cross beam (33) and a lever (94) arranged in an upper and lower manner, the middle cross beam (33) being fixedly mounted between the two side arms of the support frame (3) below the lifting frame (6), and a rotating shaft (95) being installed through the middle part of the middle cross beam (33) and the middle part of the lever (94) at the same time in the front and rear; an axially vertical internal spline (93) is installed at one end of the lever (94), and a cable (91) is clamped at the other end of the lever (94), and the cable (91) passes through the middle cross beam (33) upwards and then goes around to the front of the lifting frame (6); a lug (41) is extended forward from the middle part of the transmission plate (4) through the lifting frame (6), and the lug (41) is fixedly connected to the front end of the cable (91); the bottom end of the screw rod (7) is circumferentially arranged with an external spline, and after the screw rod (7) passes through the middle cross beam (33) downwards, the external spline at the bottom end of the screw rod (7) is assembled with the internal spline (93); The structure of the horizontal locking mechanism (8) is as follows: it comprises an inclined wedge block (82) of a frame-type structure, the inner bottom surface of the inclined wedge block (82) is set as a lower inclined surface, the end of the transmission plate (4) is clamped with an upper wedge block (81), and the upper wedge block (81) is provided with an upper inclined surface that matches the lower inclined surface of the inclined wedge block (82); the top of the inclined wedge block (82) upwardly penetrates the bottom wall surface of the guide sleeve (52) in the slider assembly (5), the top surface of the inclined wedge block (82) is clamped with the bottom surface of the slider (51) in the slider assembly (5) in a toothed meshing manner, the bottom surface of the lifting frame (6) located below the inclined wedge block (82) is installed with a bottom cover (84), and an elastic body (83) is installed between the bottom surface of the inclined wedge block (82) and the bottom cover (84).

2. A steplessly adjustable four-way headrest adjustment mechanism as claimed in claim 1, characterized in that: The structure of the button assembly (2) is as follows: it comprises a button sleeve (23) which penetrates the side wall of the outer shell (1) and is fixed thereto; a button (25) is installed along the axial direction through the button sleeve (23); the inner end of the button (25) is clamped with the button sleeve (23) by means of a barb; the push block (21) is installed between the end of the transmission plate (4) and the inner end of the button (25); the side surface of the push block (21) is clamped and fixedly connected with the end of the transmission plate (4); an elastic body 2 (22) is installed between the push block (21) and the lifting frame (6); and an elastic body 3 (24) is installed between the step on the inner wall of the button sleeve (23) and the button (25).

3. A steplessly adjustable four-way headrest adjustment mechanism as claimed in claim 1, characterized in that: The structure of the lifting frame (6) is as follows: it comprises a front frame (62) and a rear frame (61) arranged front and rear, the front frame (62) and the rear frame (61) being fixedly connected as a whole by clamping; a space for accommodating a transmission plate (4) and a horizontal locking mechanism (8) is formed between the front frame (62) and the rear frame (61), and the rear frame (61) is contained inside the front frame (62).

4. A steplessly adjustable four-way headrest adjustment mechanism as claimed in claim 1, characterized in that: The support frame (3) has a structure comprising a support rod (34) of an inverted U-shaped structure, an upper crossbeam (31) being fixedly mounted below a top horizontal arm of the support rod (34), sleeves (32) being installed between two vertical arms of the support rod (34) and the lifting frame (6), and a middle crossbeam (33) being fixedly mounted between the two vertical arms of the support rod (34) located below the sleeves (32); and the bottoms of the two vertical arms of the support rod (34) are fixedly mounted to an external seat.

5. The steplessly adjustable four-way headrest adjustment mechanism according to claim 1, characterized in that: The structure of the slider assembly (5) is as follows: it comprises a slider (51), the slider (51) being sheathed with a guide sleeve (52) in the circumferential direction; the guide sleeve (52) penetrates the lifting frame (6) from front to back, and the guide sleeve (52) is fixedly mounted on the lifting frame (6); guide rods (53) are symmetrically penetrated on the lifting frame (6) located outside the slider (51) on both sides, and the two ends of the guide rods (53) located on the front and rear sides of the lifting frame (6) are respectively fixedly mounted on the inner wall surface of the outer shell (1); a through hole is formed on the bottom surface of the guide sleeve (52), and a tooth profile in the left and right directions is arranged on the bottom surface of the slider (51).

6. The steplessly adjustable four-way headrest adjustment mechanism according to claim 1, characterized in that: The structure of the outer shell (1) is as follows: it comprises a front half shell (11) and a rear half shell (12) arranged front and rear, the edge of the front half shell (11) and the edge of the rear half shell (12) being matched and snap-fitted to form an outer shell (1) of an integrated structure; the two ends of the slider assembly (5) are respectively fixed to the inner side surfaces of the front half shell (11) and the rear half shell (12) opposite to each other; the bottom surface of the rear half shell (12) is provided with a strip groove for the two arms of the support frame (3) to pass through and slide relative to each other forward and backward.

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