CN111923802A

CN111923802A - Stepless-adjustment four-way headrest adjusting mechanism

Info

Publication number: CN111923802A
Application number: CN202010915571.3A
Authority: CN
Inventors: 周文华
Original assignee: Et Technology Wuxi Co ltd
Current assignee: Et Technology Wuxi Co ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2020-11-13

Abstract

The invention relates to a four-way headrest adjusting mechanism for stepless adjustment, which comprises an outer shell, wherein an inverted U-shaped support frame is arranged in the outer shell, the middle parts of two arms of the support frame are sleeved with a lifting frame together, a sliding block assembly penetrates through the lifting frame in the front and back direction and is installed in a sliding manner, and two ends of the sliding block assembly are fixedly installed on the opposite wall surfaces of the outer shell respectively; a rotation-linear conversion mechanism is arranged between the lifting frame and the supporting frame; the locking mechanism locks the sliding of the sliding block component and the rotation of the rotating piece in the rotation-linear conversion mechanism; the force is applied to the button, so that the horizontal locking mechanism releases the front and back movement freedom degree of the sliding block assembly in a descending mode, the lifting locking mechanism releases the rotation freedom degree of the rotation piece, the sliding block assembly moves back and forth relative to the lifting frame along with the outer shell when up-down or front-back force is applied to the outer shell, the lifting frame moves up and down relative to the supporting frame along with the sliding block assembly and the outer shell, and accordingly stepless adjustment of the headrest in four directions is achieved.

Description

Stepless-adjustment four-way headrest adjusting mechanism

Technical Field

The invention relates to the technical field of seat headrests, in particular to a four-way headrest adjusting mechanism capable of achieving stepless adjustment.

Background

The headrest is an important configuration in the safety of the automobile, the quality of the headrest not only relates to the comfort level of drivers and passengers, but also supports the cervical vertebra of the passengers under the condition of severe collision of the automobile, and effectively protects the cervical vertebra and even the life safety; therefore, the comfort and the height and position matching of the headrest are of great importance.

In the prior art, the headrest is adjusted in the up-down direction and the front-back direction to match the head height of a driver and a passenger and the front-back fitting degree; however, the existing headrest adjusting mechanism is complicated in structure, troublesome and labor-consuming in unlocking, and can be adjusted only in a limited number of gears, so that the degree of matching with the head of a user is not high, and the headrest adjusting mechanism is inconvenient to use.

Disclosure of Invention

The four-direction headrest adjusting mechanism is reasonable in structure and capable of achieving stepless adjustment of the headrest in four directions, adjustment is simple, use is convenient, practicality is good, user experience is greatly improved, and comfort is improved.

The technical scheme adopted by the invention is as follows:

a four-way headrest adjusting mechanism achieving stepless adjustment comprises an outer shell, wherein a support frame with an inverted U-shaped structure is arranged in the outer shell, a lifting frame is sleeved at the middle parts of two arms of the support frame together, a sliding block assembly penetrates through the lifting frame in the front and back direction and is installed in a sliding mode, and two ends of the sliding block assembly are fixedly installed on two opposite wall surfaces of the outer shell respectively; a rotation-linear conversion mechanism is arranged between the lifting frame and the supporting frame; and the locking mechanism simultaneously locks the sliding of the sliding block assembly and the rotation of the rotating piece in the rotation-linear conversion mechanism.

As a further improvement of the above technical solution:

the locking mechanism has the structure that: the push-button assembly penetrates through the side wall of the shell, the inner end of the push-button assembly extends into the shell, the front end of the push-button assembly positioned in the shell is connected and provided with a push block, the inner side surface of the push block is fixedly provided with a transmission plate, the transmission plate is positioned in the lifting frame, the end of the transmission plate is provided with a horizontal locking mechanism, and the top of the horizontal locking mechanism is clamped and matched with the sliding block assembly; and a lifting locking mechanism is arranged between the rear part of the lifting frame and the support frame and is engaged and clamped with the rotating piece.

The rotating piece is a screw rod, and the screw rod is rotatably arranged on the supporting frame; the lifting frame is fixedly provided with an axially vertical nut, and the screw rod is matched with the nut screw pair to form a rotation-linear conversion mechanism;

the lifting locking mechanism has the structure that: the middle cross beam is fixedly arranged between two side arms of the support frame below the lifting frame, and a rotating shaft is arranged in a manner of penetrating through the middle part of the middle cross beam and the middle part of the lever in front and at the back; one end of the lever is provided with an axial vertical internal spline, the other end of the lever is clamped with a pull rope, and the pull rope upwards penetrates through the middle cross beam and then winds to the front of the lifting frame; the middle part of the transmission plate penetrates through the lifting frame forward and extends to form a lug which is fixedly connected with the front end of the inhaul cable; the circumference of the bottom end of the screw rod is provided with an external spline, and after the screw rod downwards penetrates through the middle cross beam, the external spline at the bottom end of the screw rod is assembled with the internal spline.

The rotating piece is a pinion, and the pinion is rotatably arranged on the side wall of the lifting frame; a tooth-shaped structure is arranged on the wall surface of a vertical arm of the support frame along the axial direction, and a pinion is meshed with the tooth-shaped structure to form a rotation-linear conversion mechanism;

the lifting locking mechanism has the structure that: the lifting frame comprises a supporting shaft, wherein the side wall of the lifting frame extends towards a push block, and a pinion is rotatably sleeved at the end of the supporting shaft; a locking shaft extends from the inner side surface of the push block, the axial direction of the locking shaft is positioned on the same straight line with the axial direction of the supporting shaft and the pinion, and the end head of the locking shaft is provided with a spline structure; a spline hole and a shaft hole are sequentially arranged along the axial direction through the axis of the pinion, the spline hole is meshed with a spline structure of the locking shaft, and the shaft hole is rotatably connected with the outer wall of the supporting shaft; and the center of the end part of the supporting shaft is also provided with a blind hole for accommodating a spline structure.

The structure of the horizontal locking mechanism is as follows: the wedge block comprises a wedge block with a frame-shaped structure, wherein the inner bottom surface of the wedge block is provided with a lower inclined surface, an upper wedge block is clamped at the end of the transmission plate, and an upper inclined surface matched with the lower inclined surface of the wedge block is arranged on the upper wedge block; the top of the oblique wedge block upwards penetrates through the bottom wall surface of a guide sleeve in the sliding block assembly, the top surface of the oblique wedge block and the bottom surface of a sliding block in the sliding block assembly are in tooth-shaped engagement clamping, a bottom cover is installed on the bottom surface of a lifting frame located below the oblique wedge block, and a first elastic body is installed between the bottom surface of the oblique wedge block and the bottom cover.

The button assembly is structurally characterized in that: the button sleeve penetrates through the side wall surface of the outer shell inside and outside and is fixedly installed, a button is installed in the mode that the button sleeve penetrates through the button sleeve along the axial direction, and the inner end of the button is clamped with the button sleeve through an agnail; the push block is arranged between the end head of the transmission plate and the inner end head of the button, the side face of the push block is fixedly connected with the end head of the transmission plate in a clamping mode, the second elastic body is arranged between the push block and the lifting frame, and the third elastic body is arranged between the step on the inner wall face of the button sleeve and the button.

The crane has the structure that: the front frame and the rear frame are fixedly connected into a whole in a clamping manner; a space for accommodating the transmission plate and the horizontal locking mechanism is formed between the front frame and the rear frame, and the rear frame is contained inside the front frame.

The structure of the support frame is as follows: the device comprises a supporting rod with an inverted U-shaped structure, wherein an upper cross beam is fixedly arranged below a horizontal arm at the top of the supporting rod, sleeves are respectively arranged between two vertical arms of the supporting rod and a lifting frame, and a middle cross beam is fixedly arranged between the two vertical arms of the supporting rod below the sleeves; the bottoms of the two vertical arms of the supporting rod are fixedly arranged with an external seat.

The structure of the sliding block component is as follows: comprises a sliding block, wherein a guide sleeve is sleeved on the sliding block in the circumferential direction; the front part and the rear part of the guide sleeve penetrate through the lifting frame, and the guide sleeve and the lifting frame are fixedly arranged; guide rods symmetrically penetrate through the lifting frames positioned outside the two sides of the sliding block, and two ends of the guide rods positioned on the front side and the rear side of the lifting frames are fixedly installed on the inner wall surface of the outer shell respectively; the bottom surface of the guide sleeve is provided with a through hole, and the bottom surface of the sliding block is provided with a tooth shape in the left-right direction.

The structure of shell body does: the integrated shell comprises a front half shell and a rear half shell which are arranged in a front-back mode, wherein the edge of the front half shell and the edge of the rear half shell are matched and clamped to form an integrated shell body; two ends of the sliding block component are fixedly arranged on the inner side surfaces of the front half shell and the rear half shell which are opposite to each other; and the bottom surface of the rear half shell is provided with a strip-shaped groove which is used for the penetration of the two arms of the support frame and slides back and forth relatively.

The invention has the following beneficial effects:

the sliding block assembly is compact and reasonable in structure and convenient to operate, the push block and the transmission plate are pushed to translate by applying force to the button, the horizontal locking mechanism descends through the cooperation of the inclined wedge to release the front-back movement freedom degree of the sliding block assembly, and the lifting locking mechanism is pulled through the inhaul cable to release the rotation freedom degree of the lead screw or the rotation freedom degree of the pinion through the locking shaft; then, exert about or side direction power around on the shell body, slider assembly is for the crane back-and-forth movement along with the shell body, and the crane reciprocates for the support frame along with slider assembly, shell body, and lead screw or pinion rotate to realize the electrodeless regulation of headrest in four directions, simple swift has promoted user's use experience greatly, has effectively ensured cervical vertebra safety when promoting the comfort, and the practicality is good.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the present invention (omitting the outer casing).

Fig. 3 is an exploded view of fig. 2.

Fig. 4 is a schematic structural diagram of the present invention (with the outer casing omitted, and with another view angle, embodiment one).

Fig. 5 is a schematic structural diagram of the present invention (with the outer casing omitted, in another view, in the second embodiment).

Fig. 6 is an exploded view of the lift lock mechanism of the present invention (embodiment two).

Fig. 7 is a schematic view of the construction of the pinion gear of the present invention.

FIG. 8 is a schematic structural view of the wedge, the guide sleeve and the slide block.

Wherein: 1. an outer housing; 2. a button assembly; 3. a support frame; 4. a drive plate; 5. a slider assembly; 6. a lifting frame; 7. a screw rod; 8. a horizontal locking mechanism; 9. a lifting locking mechanism; 11. a front half shell; 12. a rear half shell; 21. a push block; 22. an elastic body II; 23. a button sleeve; 24. an elastomer III; 25. a button; 31. an upper cross beam; 32. a sleeve; 33. a middle cross beam; 34. a support bar; 41. a lug; 51. a slider; 52. a guide sleeve; 53. a guide bar; 61. a rear frame; 62. a front frame; 81. an upper wedge block; 82. a tapered wedge; 83. an elastic body I; 84. a bottom cover; 91. a cable; 92. a nut; 93. an internal spline; 94. a lever; 95. a rotating shaft; 96. a support shaft; 97. a pinion gear; 98. a lock shaft; 99. a tooth-shaped structure; 961. blind holes; 971. a shaft hole; 972. a splined bore.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 and 2, the stepless-adjustment four-way headrest adjusting mechanism of the embodiment comprises an outer shell 1, wherein a support frame 3 with an inverted U-shaped structure is installed inside the outer shell 1, a lifting frame 6 is sleeved at the middle parts of two arms of the support frame 3 together, a sliding block assembly 5 is installed in a sliding manner by penetrating the lifting frame 6 from front to back, and two ends of the sliding block assembly 5 are fixedly installed on two opposite wall surfaces of the outer shell 1 respectively; a rotation-linear conversion mechanism is arranged between the lifting frame 6 and the supporting frame 3; the locking mechanism simultaneously locks the sliding of the sliding block component 5 and the rotation of the rotating piece in the rotation-linear conversion mechanism; after the sliding of the sliding block component 5 and the rotation of the rotating part are unlocked through the locking mechanism, when front and back lateral forces are exerted on the outer shell 1, the sliding block component 5 moves back and forth relative to the lifting frame 6 along with the outer shell 1, so that the front and back adjustment of the outer shell 1, namely the headrest, is realized; when a force is applied to the outer shell 1, the lifting frame 6 moves up and down along with the sliding block assembly 5 and the outer shell 1 relative to the supporting frame 3, and the rotating piece rotates to realize the up-and-down height adjustment of the outer shell 1, namely the headrest; after the up-down or front-back adjustment is in place, the locking mechanism locks the rotation of the sliding block assembly 5 and the rotating part, and then the position adjustment cannot be carried out through the application of force on the outer shell 1.

As shown in fig. 3, the locking mechanism has the following structure: the sliding block assembly comprises a button assembly 2 penetrating through the side wall of an outer shell 1, wherein the inner end of the button assembly 2 extends into the outer shell 1, a push block 21 is installed at the front end of the button assembly 2 positioned in the outer shell 1 in a connected mode, a transmission plate 4 is fixedly installed on the inner side surface of the push block 21, the transmission plate 4 is positioned in a lifting frame 6, a horizontal locking mechanism 8 is installed at the end of the transmission plate 4, the top of the horizontal locking mechanism 8 is in clamping fit with a sliding block assembly 5, and the front-back movement freedom degree of the sliding block assembly 5 is; install lift locking mechanism 9 between crane 6 rear and the support frame 3, lift locking mechanism 9 clamps with rotating the piece meshing, locks the rotational degree of freedom of rotating the piece to the lift degree of freedom of restriction crane 6.

The structure of the horizontal locking mechanism 8 is as follows: the wedge block mechanism comprises a wedge block 82 with a frame-shaped structure, wherein the inner bottom surface of the wedge block 82 is provided with a lower inclined surface, an upper wedge block 81 is clamped at the end of a transmission plate 4, and an upper inclined surface matched with the lower inclined surface of the wedge block 82 is arranged on the upper wedge block 81; the top of the wedge block 82 penetrates through the bottom wall surface of the guide sleeve 52 in the sliding block assembly 5 upwards, the top surface of the wedge block 82 is in tooth-shaped engagement clamping with the bottom surface of the sliding block 51 in the sliding block assembly 5, the bottom cover 84 is installed on the bottom surface of the lifting frame 6 located below the wedge block 82, and the first elastic body 83 is installed between the bottom surface of the wedge block 82 and the bottom cover 84.

The button assembly 2 has the structure that: the button sleeve 23 penetrates through the side wall surface of the outer shell 1 from inside to outside and is fixedly installed, a button 25 penetrates through the button sleeve 23 along the axial direction and is installed, and the inner end of the button 25 is clamped with the button sleeve 23 through an agnail; the push block 21 is arranged between the end head of the transmission plate 4 and the inner end head of the button 25, the side face of the push block 21 is fixedly connected with the end head of the transmission plate 4 in a clamping mode, the second elastic body 22 is arranged between the push block 21 and the lifting frame 6, and the third elastic body 24 is arranged between the step of the inner wall face of the button sleeve 23 and the button 25.

The crane 6 has the structure that: comprises a front frame 62 and a rear frame 61 which are arranged in front and back, wherein the front frame 62 and the rear frame 61 are fixedly connected into a whole in a clamping way; 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 accommodated inside the front frame 62.

The structure of the support frame 3 is as follows: the device comprises a support rod 34 with an inverted U-shaped structure, wherein an upper cross beam 31 is fixedly arranged below a horizontal arm at the top of the support rod 34, sleeves 32 are respectively arranged between two vertical arms of the support rod 34 and a lifting frame 6, and a middle cross beam 33 is fixedly arranged between the two vertical arms of the support rod 34 below the sleeves 32; the bottom of the two vertical arms of the support bar 34 is fixedly mounted with the external seat.

The structure of the slide block component 5 is as follows: comprises a slide block 51, wherein a guide sleeve 52 is sleeved on the slide block 51 in the circumferential direction; the guide sleeve 52 penetrates through the lifting frame 6 from front to back, and the guide sleeve 52 and the lifting frame 6 are fixedly arranged; guide rods 53 symmetrically penetrate through the lifting frame 6 positioned outside the two sides of the sliding block 51, and two ends of the guide rods 53 positioned on the front side and the rear side of the lifting frame 6 are fixedly arranged on the inner wall surface of the outer shell 1 respectively; the bottom surface of the guide sleeve 52 is provided with a through hole, the bottom surface of the slide block 51 is provided with a tooth shape in the left-right direction, and after the top of the wedge block 82 in the horizontal locking mechanism 8 penetrates through the guide sleeve 52 from bottom to top through the through hole, the top surface of the wedge block 82 is engaged and clamped with the tooth shape of the bottom surface of the slide block 51, as shown in fig. 8.

The structure of the outer shell 1 is as follows: the shell comprises a front half shell 11 and a rear half shell 12 which are arranged in a front-rear mode, wherein the edge of the front half shell 11 and the edge of the rear half shell 12 are matched and clamped to form an outer shell 1 of an integrated structure; two ends of the sliding block component 5 are respectively fixedly arranged on the inner side surfaces opposite to the front half shell 11 and the rear half shell 12; the bottom surface of the rear half shell 12 is provided with a strip-shaped groove which is used for the penetration of two arms of the support frame 3 and slides back and forth relatively.

The first embodiment is as follows:

as shown in fig. 3 and 4, the rotating member is a screw rod 7, and the screw rod 7 is rotatably mounted on the upper cross beam 31 and the middle cross beam 33 of the support frame 3; the lifting frame 6 is fixedly provided with an axially vertical nut 92, and the screw rod 7 is matched with a screw pair of the nut 92 to form a rotation-linear conversion mechanism;

the lifting locking mechanism 9 has the structure that: the lifting frame comprises a middle cross beam 33 and a lever 94 which are arranged up and down, wherein the middle cross beam 33 is fixedly arranged between two side arms of the support frame 3 below the lifting frame 6, and a rotating shaft 95 is arranged in a manner of penetrating through the middle part of the middle cross beam 33 and the middle part of the lever 94 at the same time from front to back; one end of the lever 94 is provided with an axial vertical internal spline 93, the other end of the lever 94 is clamped with a guy cable 91, and the guy cable 91 upwards passes through the middle cross beam 33 and then winds to the front of the lifting frame 6; the middle part of the transmission plate 4 penetrates through the lifting frame 6 forwards and extends to form a lug 41, and the lug 41 is fixedly connected with the front end of the inhaul cable 91; the circumference of the bottom end of the screw rod 7 is provided with an external spline, and after the screw rod 7 downwards penetrates through the middle cross beam 33, the external spline at the bottom end of the screw rod 7 is assembled with the internal spline 93.

The working principle of the first embodiment is as follows:

the first step is as follows: pressing a button 25 on the side surface of the outer shell 1, moving the button 25 inwards relative to the button sleeve 23, and compressing the elastic body III 24; the inner end of the button 25 contacts and pushes the push block 21 to move, the second elastic body 22 is compressed, and the transmission plate 4 moves along with the push block 21;

the second step is that: the upper wedge 81 at the end of the driving plate 4 moves to apply a downward force to the inclined wedge 82 through the inclined surface; the wedge block 82 descends, the top of the wedge block is separated from the slide block 51, the freedom degree of the slide block 51 sliding back and forth along the guide sleeve 52 is released, and the first elastic body 83 is compressed; synchronously, the lug 41 on the side surface of the transmission plate 4 pulls the end part of the stay cable 91, the end part of the lever 94 is pulled upwards through the stay cable 91, the lever 94 rotates relative to the middle cross beam 33 by taking the rotating shaft 95 as a circle center, the other end of the lever 94 swings downwards to drive the internal spline 93 to descend, and the internal spline 93 is separated from the bottom end of the screw rod 7, so that the rotational freedom degree of the screw rod 7 is released, namely the lifting freedom degree of the lifting frame 6 in screw fit with the screw rod 7 is released through the nut 92;

the third step: front and back lateral forces are exerted on the outer shell 1, the sliding block 51 in the sliding block assembly 5 and the outer shell 1 move back and forth relative to the guide sleeve 52 on the lifting frame 6, and the guide rod 53 is matched with the lifting frame 6 to play a role in guiding, so that the front and back position adjustment of the outer shell 1, namely the headrest, is realized;

the fourth step: the up-down force is applied to the outer shell 1, the lifting frame 6, the sliding block assembly 5 and the outer shell 1 move up and down relative to the support frame 3 by taking two arms of the support rod 34 as a guide, and the screw rod 7 in spiral fit with the lifting frame 6 rotates to realize the up-down position adjustment of the outer shell 1, namely the headrest;

the fifth step: after the front-back and up-down positions are adjusted to the right position, the force applied to the button 25 is released, the button 25 and the push block 21 reset under the action of the compressed second elastic body 22 and the compressed third elastic body 24, and the transmission plate 4 resets along with the push block 21;

and a sixth step: the upper wedge block 81 resets along with the transmission plate 4, the inclined wedge block 82 resets and moves upwards under the action of the compressed elastic body one 83, and then the top of the inclined wedge block 82 extends into the guide sleeve 52 of the sliding block assembly 5 again and is matched with the tooth shape of the sliding block 51 to limit the degree of freedom of the forward and backward movement of the sliding block 51;

the seventh step: resetting the transmission plate 4, resetting the end part of the stay cable 91 connected with the transmission plate 4, releasing the force of the other end of the stay cable 91 pulling the lever 94, reversely rotating and resetting the lever 94 relative to the middle cross beam 33 by taking the rotating shaft 95 as a circle center, ascending the other end of the lever 94, enabling the inner spline 93 at the end part to be sleeved at the bottom end of the screw rod 7 again and matched with the outer spline, limiting the rotational freedom degree of the screw rod 7, further limiting the lifting freedom degree of the nut 92 matched with the screw rod 7, and limiting the lifting freedom degree of the lifting frame 6;

eighth step: the front-back and lifting adjustment of the headrest is completed.

Example two:

as shown in fig. 5 and 6, the rotating member is a pinion 97, and the pinion 97 is rotatably mounted on the side wall of the lifting frame 6; a tooth-shaped structure 99 is arranged on the wall surface of the vertical arm of the support frame 3 along the axial direction, namely the tooth-shaped structure 99 is arranged on the back surface of the vertical arm of the support rod 34 close to the button assembly 2, and the pinion 97 is meshed with the tooth-shaped structure 99 to form a rotation-linear conversion mechanism; the sleeve 32 opposite the tooth formations 99 is apertured so that the tooth formations 99 are exposed at the sleeve 32 and mesh with the pinion 97 on the exterior of the sleeve 32.

The lifting locking mechanism 9 has the structure that: comprises a supporting shaft 96 extending from the side wall of the rear frame 61 of the lifting frame 6 to the push block 21, wherein the end of the supporting shaft 96 is rotatably sleeved with a pinion 97; a locking shaft 98 extends from the inner side surface of the push block 21, the axial direction of the locking shaft 98 is positioned on the same straight line with the axial direction of the supporting shaft 96 and the pinion 97, and the end head of the locking shaft 98 is provided with a spline structure; a spline hole 972 and a shaft hole 971 are sequentially arranged along the axial direction through the axle center of the pinion 97, as shown in fig. 7, the spline hole 972 is engaged with the spline structure of the locking shaft 98, and the shaft hole 971 is rotatably engaged with the outer wall of the supporting shaft 96; a blind bore 961 is also provided centrally in the end of the support shaft 96 for receiving a spline structure.

The second embodiment has the working principle that:

except that the principle of the lifting locking mechanism 9 is different from that of the first embodiment, the rest is the same, namely, the working principle of the first embodiment is referred to, wherein the second step, the fourth step and the seventh step are different, and the description is as follows:

the second step is that: the release of the degree of freedom of the slider 51 sliding back and forth along the guide bush 52 in the slider assembly 5 is the same as in the first embodiment; synchronously, the locking shaft 98 moves along with the pushing block 21, the spline structure of the end head of the locking shaft 98 matched with the spline hole 972 of the pinion 97 is pushed into the blind hole 961 of the supporting shaft 96, the rotational freedom degree of the pinion 97 is released, so that the supporting frame 3 matched with the pinion 97 and the tooth-shaped structure 99 and the lifting frame 6 can move linearly relatively, namely the lifting freedom degree of the lifting frame 6 relative to the supporting frame 3 is released;

the fourth step: the up-down force is exerted on the outer shell 1, the lifting frame 6, the sliding block component 5 and the outer shell 1 move up and down relative to the support frame 3 by taking two arms of the support rod 34 as guidance, and the pinion 97 engaged with the tooth-shaped structure 99 of the vertical arm of the support rod 34 rotates relative to the support shaft 96 and the lifting frame 6, so that the up-down position adjustment of the outer shell 1, namely the headrest is realized;

the seventh step: the locking shaft 98 moves along with the pushing block 21 to reset, 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 pinion 97, namely, the locking shaft 98 is matched with the pinion 97 again to enable the rotation locking, and therefore the up-and-down moving freedom degree of the lifting frame 6 relative to the supporting frame 3 is limited.

The push block 21 and the transmission plate 4 are pushed to translate by applying force to the button 25, the horizontal locking mechanism 8 descends through the cooperation of the inclined wedges to release the front-back movement freedom degree of the sliding block component 5, the lifting locking mechanism 9 is pulled through the inhaul cable 91 to release the rotation freedom degree of the screw rod 7, or the rotation freedom degree of the pinion 97 is released through the locking shaft 98; then, up-down or front-back lateral force is exerted on the outer shell 1, the sliding block assembly 5 moves back and forth along with the outer shell 1 relative to the lifting frame 6, the lifting frame 6 moves up and down along with the sliding block assembly 5 and the outer shell 1 relative to the supporting frame 3, and the screw rod 7 or the pinion 97 rotates, so that stepless adjustment of the headrest in four directions is achieved.

The invention has compact, reasonable and ingenious structure, realizes stepless adjustment of the headrest in four directions, is simple and convenient to operate, greatly improves the use experience of customers, improves the comfort and simultaneously ensures the safety of cervical vertebra.

The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.

Claims

1. The utility model provides a four-way headrest adjustment mechanism of electrodeless regulation, includes shell body (1), its characterized in that: the lifting device is characterized in that a support frame (3) with an inverted U-shaped structure is arranged in the outer shell (1), the middle parts of two arms of the support frame (3) are sleeved with a lifting frame (6) together, a sliding block assembly (5) penetrates through the lifting frame (6) in the front and back direction and is installed in a sliding mode, and two ends of the sliding block assembly (5) are fixedly installed on two opposite wall surfaces of the outer shell (1) respectively; a rotation-linear conversion mechanism is arranged between the lifting frame (6) and the support frame (3); and the locking mechanism simultaneously locks the sliding of the sliding block component (5) and the rotation of the rotating piece in the rotation-linear conversion mechanism.

2. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 1, wherein: the locking mechanism has the structure that: the push-button assembly comprises a push-button assembly (2) penetrating through the side wall of a shell body (1), wherein the inner end of the push-button assembly (2) extends into the shell body (1), a push block (21) is connected and installed at the front end of the push-button assembly (2) positioned in the shell body (1), a transmission plate (4) is fixedly installed on the inner side surface of the push block (21), the transmission plate (4) is positioned in a lifting frame (6), a horizontal locking mechanism (8) is installed at the end of the transmission plate (4), and the top of the horizontal locking mechanism (8) is clamped and matched with a sliding block assembly (5); a lifting locking mechanism (9) is arranged between the rear part of the lifting frame (6) and the support frame (3), and the lifting locking mechanism (9) is engaged with the rotating piece.

3. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 2, wherein: the rotating piece is a screw rod (7), and the screw rod (7) is rotatably arranged on the support frame (3); the lifting frame (6) is fixedly provided with an axially vertical nut (92), and the screw rod (7) is matched with the screw pair of the nut (92) to form a rotation-linear conversion mechanism;

the lifting locking mechanism (9) is structurally characterized in that: the lifting frame comprises a middle cross beam (33) and a lever (94) which are arranged up and down, wherein the middle cross beam (33) is fixedly arranged between two side arms of a supporting frame (3) below a lifting frame (6), and a rotating shaft (95) penetrates through the middle part of the middle cross beam (33) and the middle part of the lever (94) front and back; one end of the lever (94) is provided with an axial vertical internal spline (93), the other end of the lever (94) is clamped with a guy cable (91), and the guy cable (91) upwards penetrates through the middle cross beam (33) and then winds to the front of the lifting frame (6); the middle part of the transmission plate (4) penetrates through the lifting frame (6) forwards and extends to form a lug (41), and the lug (41) is fixedly connected with the front end of the inhaul cable (91); the bottom end of the screw rod (7) is circumferentially provided with an external spline, and after the screw rod (7) downwards penetrates through the middle cross beam (33), the external spline at the bottom end of the screw rod (7) is assembled with the internal spline (93).

4. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 2, wherein: the rotating piece is a small gear (97), and the small gear (97) is rotatably arranged on the side wall of the lifting frame (6); a tooth-shaped structure (99) is arranged on the wall surface of the vertical arm of the support frame (3) along the axial direction, and a pinion (97) is meshed with the tooth-shaped structure (99) to form a rotation-linear conversion mechanism;

the lifting locking mechanism (9) is structurally characterized in that: comprises a supporting shaft (96) extending from the side wall of the lifting frame (6) towards the push block (21), and a pinion (97) is rotatably sleeved at the end of the supporting shaft (96); a locking shaft (98) extends from the inner side surface of the push block (21), the axial direction of the locking shaft (98) is positioned on the same straight line with the axial direction of the supporting shaft (96) and the pinion (97), and the end head of the locking shaft (98) is provided with a spline structure; a spline hole (972) and a shaft hole (971) are sequentially arranged along the axial direction through the axis of the pinion (97), the spline hole (972) is meshed with a spline structure of the locking shaft (98), and the shaft hole (971) is rotatably connected with the outer wall of the supporting shaft (96); the center of the end part of the supporting shaft (96) is also provided with a blind hole (961) for accommodating a spline structure.

5. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 2, wherein: the structure of the horizontal locking mechanism (8) is as follows: the wedge block mechanism comprises a wedge block (82) with a frame-shaped structure, wherein the inner bottom surface of the wedge block (82) is provided with a lower inclined surface, an upper wedge block (81) is clamped at the end of the transmission plate (4), and the upper wedge block (81) is provided with an upper inclined surface matched with the lower inclined surface of the wedge block (82); the top of the inclined wedge block (82) upwards penetrates through the bottom wall surface of a guide sleeve (52) in the sliding block assembly (5), the top surface of the inclined wedge block (82) is in tooth-shaped engagement clamping with the bottom surface of a sliding block (51) in the sliding block assembly (5), a bottom cover (84) is installed on the bottom surface of the lifting frame (6) located below the inclined wedge block (82), and a first elastic body (83) is installed between the bottom surface of the inclined wedge block (82) and the bottom cover (84).

6. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 2, wherein: the button assembly (2) is structurally characterized in that: the button sleeve (23) penetrates through the side wall surface of the outer shell (1) from inside to outside and is fixedly installed, a button (25) penetrates through the button sleeve (23) along the axial direction and is installed, and the inner end of the button (25) is clamped with the button sleeve (23) through an agnail; the push block (21) is installed between the end of the transmission plate (4) and the inner end of the button (25), the side face of the push block (21) is fixedly connected with the end of the transmission plate (4) in a clamping mode, the second elastic body (22) is installed between the push block (21) and the lifting frame (6), and the third elastic body (24) is installed between the step of the inner wall face of the button sleeve (23) and the button (25).

7. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 2, wherein: the crane (6) is structurally characterized in that: the device comprises a front frame (62) and a rear frame (61) which are arranged in front and back, wherein the front frame (62) and the rear frame (61) are fixedly connected into a whole in a clamping manner; 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 accommodated inside the front frame (62).

8. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 1, wherein: the structure of the support frame (3) is as follows: the device comprises a supporting rod (34) with an inverted U-shaped structure, wherein an upper cross beam (31) is fixedly arranged below a horizontal arm at the top of the supporting rod (34), sleeves (32) are respectively arranged between two vertical arms of the supporting rod (34) and a lifting frame (6), and a middle cross beam (33) is fixedly arranged between the two vertical arms of the supporting rod (34) below the sleeves (32); the bottoms of the two vertical arms of the support rod (34) are fixedly arranged with an external seat.

9. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 1, wherein: the structure of the sliding block component (5) is as follows: comprises a slide block (51), wherein a guide sleeve (52) is sleeved on the slide block (51) in the circumferential direction; the guide sleeve (52) penetrates through the lifting frame (6) from front to back, and the guide sleeve (52) and the lifting frame (6) are fixedly arranged; guide rods (53) symmetrically penetrate through the lifting frame (6) positioned outside the two sides of the sliding block (51), and two end heads of the guide rods (53) positioned on the front side and the rear side of the lifting frame (6) are fixedly arranged on the inner wall surface of the shell body (1) respectively; the bottom surface of the guide sleeve (52) is provided with a through hole, and the bottom surface of the slide block (51) is provided with a tooth shape in the left-right direction.

10. An infinitely adjustable four-way headrest adjustment mechanism as claimed in claim 1, wherein: the structure of the outer shell (1) is as follows: the shell comprises a front half shell (11) and a rear half shell (12) which are arranged in a front-rear mode, wherein the edge of the front half shell (11) and the edge of the rear half shell (12) are matched and clamped to form an outer shell (1) with an integrated structure; two ends of the sliding block component (5) are fixedly arranged on 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-shaped groove which is used for the penetration of two arms of the support frame (3) and slides back and forth relatively.