Direction-adjustable headrest for seat back

Abstract

The invention relates to a headrest used for a seat backrest and capable of being adjusted in direction, the headrest comprises a main body and an operation module, and the operation module is connected with the main body and can drive the main body to move in the up-down direction and the front-back direction relative to the seat backrest; the operating module includes: a locking / unlocking module that controls a state of the headrest relative to the seat back; wherein, in the locked state, the headrest is fixed relative to the seat back; in the unlocking state, the headrest can move relative to the seat backrest; a front-back movement module that enables the headrest to move in the front-back direction; and an up-down movement guide rail module installed in the seat back, the locking / unlocking module and the front-back movement module being connected to the up-down movement guide rail module so as to be movable in the up-down direction; wherein the locking / unlocking module and the front-back moving module are mounted in the main body; in the unlocking state, the headrest can move in the up-down direction and / or the front-back direction through the locking / unlocking module and the front-back moving module.

Description

Technical Field

[0001] The present invention relates to a seat backrest, and more particularly to a headrest capable of adjusting the direction of the seat backrest. Background Art

[0002] With the development trend of environmental protection vehicles, automobile seats are more inclined to be sporty and integrated. Adding the design and function of an adjustable headrest on the basis of an integrated seat can adapt to people of more body types. At the same time, similar requirements also exist in other means of transportation.

[0003] In the prior art, a design for adjusting the headrest up and down is provided. Refer to Figure 1 , in this design, a driving part A is installed inside the headrest, and a double guide rod B is provided at the lower part of the headrest. The guide rod B is connected to a fixing part C installed on the seat backrest, and a locking and unlocking part D is installed at one of the fixing parts C. When the height of the headrest needs to be adjusted, the user presses the unlocking part D with one hand to unlock, and uses the other hand to adjust the headrest up and down to a predetermined height, and then locks the locking and unlocking part D to complete the adjustment of the headrest.

[0004] When using this kind of headrest, the user must use both hands to unlock and lock the locking and unlocking part D, and can only be adjusted up and down in height, and cannot be adjusted in the front-back direction; moreover, the guide rod B and the locking and unlocking part D at the lower part of the headrest are exposed outside, affecting the appearance.

[0005] Therefore, there is a need for further improvement in the existing headrest. A new type of headrest structure is needed, which can adjust the headrest in four directions: up, down, front, and back, and is convenient to use and has a beautiful structure.

[0006] The information disclosed in the background part of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] In order to solve the problems existing in the prior art, the present invention provides a headrest capable of adjusting the direction for a seat backrest, which can adjust the headrest in four directions: up, down, front, and back.

[0008] The headrest capable of adjusting the direction for the seat backrest of the present invention can also be adjusted conveniently using a single-handed operation.

[0009] The headrest capable of adjusting the direction for the seat backrest of the present invention has a beautiful design.

[0010] To solve the above technical problems, an embodiment of the present invention provides a headrest for a seat back that can be adjusted in direction. The headrest includes a main body and an operation module. The operation module is connected to the main body and can drive the main body to move relative to the seat back in the up-down direction and the front-back direction. The operation module includes: a locking / unlocking module that controls the state of the headrest relative to the seat back. In the locked state, the headrest is fixed relative to the seat back. In the unlocked state, the headrest can move relative to the seat back.

[0011] A front-back movement module that enables the headrest to move in the front-back direction; and an up-down movement guide rail module that is installed in the seat back. The locking / unlocking module and the front-back movement module are connected to the up-down movement guide rail module so as to be able to move in the up-down direction. The locking / unlocking module and the front-back movement module are installed inside the main body. In the unlocked state, the headrest can move in the up-down direction and / or the front-back direction through the locking / unlocking module and the front-back movement module.

[0012] Preferably, the locking / unlocking module includes: a bottom plate; a locking plate that is installed on the bottom plate and can move in the left-right direction to lock the locking / unlocking module on the up-down movement guide rail module; and

[0013] a driving assembly that is installed on the bottom plate and can drive the locking plate to move.

[0014] Preferably, the bottom plate has a guide groove, and the middle part of the bottom plate has a downward concave portion. The bottom of the concave portion has a through hole. The locking plate includes a moving frame, a guide rod, and a locking rod. The guide rod is installed in the guide groove of the bottom plate, and the locking rod locks with the up-down movement guide rail module. The driving assembly includes a knob, a rotating shaft, a driving link, and a spring. The knob is located below the concave portion of the bottom plate. The rotating shaft passes upward through the through hole of the concave portion. One end of the rotating shaft is fixedly connected to the knob, and the other end is fixedly connected to the driving link. The driving link has a toggle rod at the end on the side opposite to the rotating shaft, and this toggle rod contacts the inner side of the moving frame to push the locking plate to move.

[0015] Preferably, the up-down movement guide rail module includes: a pair of fixed guide rails with a U-shaped cross-section, fixed on the seat back and having a plurality of locking holes. The locking rod can be inserted into the locking holes so that the locking / unlocking module is locked relative to the up-down movement guide rail module; and a pair of moving guide rails installed inside the fixed guide rails and capable of moving relative to the fixed guide rails. The bottom plate of the locking / unlocking module and the front-back movement module are fixedly connected to the moving guide rails.

[0016] Preferably, the up-down movement guide rail module further includes: a first ball group provided between the fixed guide rails and the moving guide rails.

[0017] Preferably, the front-back movement module is located above or below the locking / unlocking module, and the front-back movement module includes: a cover plate, a locking pin, and a locking frame; a middle portion of the cover plate has a groove, and a lower end of the groove has an opening; the locking pin and the locking frame are received in the groove; the locking frame is a hollow frame body that can move in the front-back direction relative to the cover plate; one side of the locking frame has a plurality of card slots, and front and rear ends of the locking frame are fixedly connected to the headrest; the locking pin is sleeved outside the locking frame and can move in the left-right direction relative to the locking frame, and one side of the locking pin has a pin for cooperating with the card slots of the locking frame.

[0018] Preferably, the locking plate further includes a stepped section, and the stepped section is arranged between the guide rod and the locking rod; a lower side of the locking pin has a protrusion, and the protrusion cooperates with the stepped section of the locking plate, so that when the locking plate moves, the locking pin can be simultaneously pushed to move in the left-right direction, so that the pin of the locking pin is stuck in or disengaged from the card slots of the locking frame.

[0019] Preferably, the front-back movement module further includes a ball group, and upper and lower sides of the locking frame respectively have tracks for cooperating with the second ball group.

[0020] Preferably, the operation module further includes a frame, and the frame is installed on the seat backrest and is respectively connected to the frame of the seat backrest and the fixed guide rail.

[0021] Preferably, the main body includes: a headrest cover, a front / rear inner cover; the headrest cover is arranged on the outermost side of the main body, the front / rear inner cover is located inside the headrest cover, and an accommodation space is formed inside the front / rear inner cover to accommodate the operation module; the front / rear inner cover is connected to the front-back movement module, so as to be able to move the headrest.

[0022] The adjustable headrest for a seat backrest according to the present invention has the following beneficial effects:

[0023] (1) It can improve the disadvantages of the existing headrest adjustment method of the integrated seat and realize various adjustment functions of the integrated seat.

[0024] (2) It improves the existing locking / unlocking method of the headrest and facilitates the function of seat adjustment.

[0025] (3) By optimizing the fixing method of the headrest and the rear frame, the moving feeling of the seat is maintained, and the adjustment function of the headrest is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shows a headrest for a seat backrest of the prior art.

[0027] Figure 2 Shows an adjustable headrest for a seat backrest according to an embodiment of the present invention, wherein the dashed line indicates the situation of up-and-down adjustment of the headrest.

[0028] Figure 3 Shows an adjustable headrest for a seat back according to an embodiment of the present invention, where the dashed line indicates the situation of front - rear adjustment of the headrest.

[0029] Figure 4 Shows the situation where the headrest and its components are installed in the seat back.

[0030] Figure 5 Front view of the headrest installed in the seat back, where the support parts on the left and right sides of the seat back are removed.

[0031] Figure 6 Rear view of the headrest installed in the seat back, where the support parts on the left and right sides of the seat back are removed.

[0032] Figure 7A Exploded view of the headrest.

[0033] Figure 7B Is a schematic diagram showing the assembled state of the headrest.

[0034] Figure 7C Is a schematic diagram showing the components of the headrest.

[0035] Figure 8A Is a schematic diagram showing the components of the operation module.

[0036] Figure 8B Exploded view of the operation module.

[0037] Figure 9A Is a schematic diagram showing the assembled state of the locking / unlocking module.

[0038] Figure 9B Is a schematic diagram showing the components of the locking / unlocking module.

[0039] Figure 10A Side view of the locking / unlocking module.

[0040] Figure 10B Top view of the locking / unlocking module.

[0041] Figure 10C Bottom view of the locking / unlocking module, where the locking lever is in the extended state.

[0042] Figure 10D Bottom view of the locking / unlocking module, where the locking lever is in the retracted state.

[0043] Figure 11A Is a schematic diagram showing the assembled state of the up - down moving guide rail module.

[0044] Figure 11B It is an exploded view of the up-and-down moving guide rail module.

[0045] Figure 12 It is a schematic diagram showing the state where the lock rod of the locking / unlocking module is inserted into the up-and-down moving guide rail module.

[0046] Figure 13A It is a schematic diagram showing the assembled state of the front-and-back moving module.

[0047] Figure 13B It is a schematic diagram of the components of the front-and-back moving module.

[0048] Figure 14A It is a schematic diagram showing the state of the front-and-back moving module, where the lock pin is separated from the lock bracket.

[0049] Figure 14B It is a schematic diagram showing the state of the front-and-back moving module, where the lock pin is clamped with the lock bracket.

[0050] Explanation of the reference numerals in the figure:

[0051] A: Driving part B: Guide rod

[0052] C: Fixed part D: Locking / unlocking part

[0053] T: Headrest Z: Seat back

[0054] 1: Main body 1a: Headrest cover

[0055] 1b: Front / rear inner cover 1c: Front / rear bottom cover

[0056] 2: Operation module 10: Locking / unlocking module

[0057] 101: Locking plate 101a: Moving frame

[0058] 101b: Guide rod 101c: Locking rod

[0059] 101d: Step section 102: Bottom plate

[0060] 102a: Recess 102b: Upper surface

[0061] 102c: Pin post 102d: Guide groove

[0062] 103: Driving assembly 103a: Knob

[0063] 103b: Rotating shaft 103c: Driving link

[0064] 103d: Spring 20: Front-and-back moving module

[0065] 201: Cover plate 202: Lock pin

[0066] 202a: Protrusion 203: Lock bracket

[0067] 204: Second ball set 30: Vertical movement guide rail module

[0068] 301: Fixed guide rail 302: Movable guide rail

[0069] 303: First ball set 40: Frame.

[0070] Unless otherwise specified, for the drawings, the same reference numerals or symbols indicate the same elements.

[0071] It should be understood that the drawings are not necessarily drawn to scale, but rather present simplified representations of various features to illustrate the mounting principle of the present invention. The specific design features disclosed in the present invention (including, for example, specific dimensions, directions, positions, and shapes) will be determined in part by the specific application and use environment.

[0072] In these figures, throughout the multiple figures of the drawings, the same reference numerals represent the same or equivalent parts of the present invention. Detailed implementation manners

[0073] The following will refer in detail to various embodiments of the present invention, examples of which are presented in the drawings and described as follows. Although the present invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the present invention to these exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modified forms, equivalent forms, and other embodiments that may be included within the spirit of the present invention and the scope defined by the appended claims.

[0074] A headrest capable of direction adjustment for a seat back according to an embodiment of the present invention is for mounting on the upper part of the seat back and can be adjusted in the vertical, front-back, and left-right directions relative to the seat, so as to provide a comfortable and suitable headrest position for the occupant.

[0075] The vertical direction refers to the direction upward and downward relative to the seat back.

[0076] The left-right direction refers to the direction along the width of the seat back.

[0077] The front-back direction refers to the direction perpendicular to the vertical and left-right directions, and is a horizontal direction and substantially perpendicular to the seat back.

[0078] The following refers to Figures 1 - 14BA direction-adjustable headrest for a seat back according to an embodiment of the present invention will be described.

[0079] Refer to Figures 2 - 4 , the headrest T according to an embodiment of the present invention is mounted on the seat back Z of a vehicle. There are upwardly protruding support portions provided on both sides of the upper part of the seat back Z, and a groove is formed between the two support portions. The headrest T is mounted in the groove and can move in the vertical direction and the front-rear direction relative to the seat back Z. Figure 2 and Figure 3 The dashed lines in Figure 2 and Figure 3 show the positions where the headrest T is adjusted. It can be seen from Figure 4 that the headrest T can be adjusted relative to the seat back Z in the vertical direction and the front-rear direction respectively. The situation of mounting the headrest T in the seat back Z is shown in

[0080] Refer to Figure 5 , Figure 6 and Figure 7B , the direction-adjustable headrest T for a seat back according to an embodiment of the present invention includes a main body 1 and an operation module 2. The operation module 2 is mounted on the main body 1 and the seat back Z, enabling the main body 1 to move up and down and back and forth relative to the seat back Z.

[0081] Refer to Figure 7A , the main body 1 includes: a headrest cover 1a, front / rear inner covers 1b, front / rear bottom covers 1c, and external foam.

[0082] The headrest cover 1a is located on the outermost side of the headrest T, and the front / rear inner covers 1b, front / rear bottom covers 1c, and external foam are located inside the headrest cover 1a. The headrest cover 1a constitutes the design of the appearance of the headrest T, usually made of a woven material or leather.

[0083] The front / rear inner covers 1b function to separate the operation module 2 and the external foam. The front / rear inner covers 1b together form an accommodation space inside to accommodate the operation module 2; and the front / rear inner covers 1b are connected to the front-rear movement module 20, so that the headrest can move.

[0084] The external foam is located between the headrest cover 1a and the front / rear inner covers 1b, and wraps the outside of the front / rear inner covers 1b to form a soft and comfortable pad.

[0085] The front / rear bottom covers 1c are assembled with the headrest cover 1a.

[0086] Although the specific structure of the main body 1 is described in this embodiment, those skilled in the art can adjust and change the structure according to specific needs without affecting the technical solution of the present invention.

[0087] The operation module 2 is used to drive the up / down and front / back movement of the headrest T and control the locking and unlocking of the headrest. Refer to Figure 8A and Figure 8B , the operation module 2 includes: a locking / unlocking module 10, a front / back movement module 20, an up / down movement guide rail module 30, and a frame 40.

[0088] The locking / unlocking module 10 is disposed inside the main body 1 of the headrest T. In the locked state, the locking / unlocking module 10 can lock the main body 1 to the seat backrest and prevent it from moving; in the unlocked state, the locking / unlocking module 10 allows the main body 1 to be adjusted relative to the seat backrest Z in the up / down direction and the front / back direction.

[0089] Refer to Figures 9A - 9B and Figures 10A - 10D , the locking / unlocking module 10 includes: a locking plate 101, a bottom plate 102, and a driving assembly 103.

[0090] The bottom plate 102 serves as a carrier for the locking / unlocking module 10, and other components of the locking / unlocking module 10 are mounted on the bottom plate 102 and can move relative to the bottom plate 102.

[0091] The middle part of the bottom plate 102 has a downward concave portion 102a, and the bottom of the concave portion 102a has a through hole. The rotating shaft 103b, the driving link 103c, etc. are all located inside the concave portion.

[0092] The upper surface 102b of the bottom plate 102 extends outward from both sides of the concave portion and has a pin 102c and a guide groove 102d.

[0093] The locking plate 101 includes a moving frame 101a, a guide rod 101b, a stepped section 101d, and a locking rod 101c. The locking plate 101 is mounted on the upper surface of the bottom plate 102 and can move relative to the bottom plate 102 in the left / right direction.

[0094] The moving frame 101a is a generally square frame body, and one side in the front / back direction is in an arc shape.

[0095] The guide rods 101b are respectively located on both sides of the moving frame 101a and extend outward in the left / right direction. The guide rods 101b are installed in the guide grooves 102d on the bottom plate 102, so that the guide grooves 102d guide the guide rods 101b when the locking plate 101 moves left / right. Although in this embodiment, the guide rods 101b are respectively located on both sides of the moving frame 101a, the guide rods 101b can also be provided only on one side of the moving frame 101a, that is, the side with the locking rod 101c.

[0096] The stepped section 101d is formed by vertically bending from the end of the guide rod 101b to form a stepped stage.

[0097] The locking lever 101c bends vertically outward from the stepped section 101d and is located outside the guide lever 101b in the left-right direction. The end of the locking lever 101c is inserted into the locking hole of the fixed guide 301 of the vertically moving guide rail module 30 when the locking / unlocking module 10 is locked, so that the locking / unlocking module 10 is fixed relative to the fixed guide 301. In one example, the end of the locking lever 101c may have a chamfer to facilitate insertion into the locking hole of the fixed guide 301. A part of the locking lever 101c is installed in the guide groove of the bottom plate 102 for guiding.

[0098] A spring 101e may be provided at the right end of the locking plate 101, so as to apply a restoring force to the left to the locking lever 101c, causing the locking lever 101c to return to the locked state of inserting into the locking hole of the fixed guide 301.

[0099] The drive assembly 103 includes a knob 103a, a rotating shaft 103b, a drive link 103c, and a spring 103d.

[0100] The knob 103a is located below the recess 102a of the bottom plate 102. By rotating the knob 103a, the state of the locking / unlocking module 10 is changed, so that the locking / unlocking module 10 is in the locked state or in the unlocked state.

[0101] The rotating shaft 103b passes upward through the through hole of the recess 102a. One end of the rotating shaft 103b is fixedly connected to the knob 103a, and the other end is fixedly connected to the drive link 103c.

[0102] The drive link 103c has a toggle at the end opposite to the rotating shaft 103b. The toggle contacts the inner side of the moving frame 101a to push the locking plate 101 to move. See Figures 10A - 10D , the arc radius of the arc side of the moving frame 101a corresponds to the length of the drive link 103c. When the knob 103a is rotated, the toggle can move from this arc side to the right and contact the side on the right to toggle the moving frame 101a to move to the right, so that the locking / unlocking module 10 is in the unlocked state.

[0103] The spring 103d is arranged on the rotating shaft 103b. The two ends of the spring 103d are respectively stuck on the drive link 103c and the bottom plate 102, so as to apply a restoring force to the left (i.e., to the locked state) to the drive link 103c. Thus, when the user releases the knob 103a, the drive link 103c and the locking plate 101 can automatically return to the locked position.

[0104] The locking / unlocking module 10 functions to lock and unlock. Rotate the knob 103a below the headrest T and move the toggle to the right, which can simultaneously unlock the locking / unlocking module and the forward and backward moving module.

[0105] In this embodiment, the locking plate 101 is only arranged on one side of the bottom plate 102, that is, the locking / unlocking module 10 only locks with the fixed guide rail 301 on the left side. As an option, the fixed guide rails on both sides can be used to lock the locking plate 101. That is, an additional locking plate is added to the other side of the bottom plate 102 of the locking / unlocking module 10, and the commutation is carried out by arranging racks on the side parts of the guide rods of the two locking plates and a gear located between the two racks, or by hinging the two locking plates through a lever, so that locking can be carried out through the fixed guide rails on the left and right sides.

[0106] See Figure 5 and Figure 6 as well as Figure 8A , the front-back moving module 20 is located above the locking / unlocking module 10 and is connected to the locking / unlocking module 10 through the pin 102c of the locking / unlocking module 10. The side of the front-back moving module 20 is mounted on the moving guide rail 302, and the front-back moving module 20 is connected to the front / rear inner cover 1b, so that in the unlocked state, the front-back moving module 20 can move the headrest in the front-back direction, and can move in the up-down direction relative to the seat back together with the locking / unlocking module 10, thereby driving the headrest to move in the up-down direction.

[0107] See Figure 13A and Figure 13B , the front-back moving module 20 includes a cover plate 201, a locking pin 202, a locking frame 203 and a second ball group 204.

[0108] The cover plate 201 serves as a carrier of the front-back moving module 20, and other components of the front-back moving module 20 are mounted thereon and can move relative to it. The middle part of the cover plate 201 has a groove, and the lower end of the groove has an opening. The locking pin 202, the locking frame 203 and the second ball group 204 are all accommodated in this groove. The left and right ends of the cover plate 201 are fixedly connected to the moving guide rail 302.

[0109] The locking frame 203 is a hollow frame body that can move in the front-back direction relative to the cover plate 201. The cross-section of the locking frame 203 is generally quadrilateral. Four tracks for cooperating with the multiple balls of the second ball group 204 are respectively arranged on its upper and lower sides, and the tracks extend in the front-back direction. And one side of the locking frame 203 (the right side in the figure) has multiple card slots.

[0110] The front and rear ends of the locking frame 203 are fixedly connected to the front / rear inner cover 1b of the headrest T. When the locking frame 203 moves relative to the cover plate 201, the locking frame 203 drives the headrest T to move in the front-back direction.

[0111] The locking pin 202 is a frame structure, sleeved on the outside of the locking frame 203 and capable of moving relative to the locking frame 203 in the left - right direction. One side of the locking pin 202 has a pin for cooperating with the slot of the locking frame 203, so that the locking pin 202 is engaged with the locking frame 203 to lock the locking frame 203 relative to the cover plate 201. In this embodiment, there are two pins, but the number of pins can also be set to one or more.

[0112] The locking pin 202 has a protrusion 202a on its lower side, and the protrusion 202a is inserted into the stepped section 101d of the locking plate 101, so that the locking plate 101 can drive the locking frame 203 to move. That is, when the locking plate 101 moves to the right to unlock, the stepped section 101d pushes the locking pin 202 to move to the right through the protrusion 202a, so that the pin of the locking pin 202 is disengaged from the slot and the locking frame 203 is unlocked; when the locking rod 101c moves to the left to lock, the locking pin 202 also moves to the left, and the pin of the locking pin 202 contacts the slot to lock the locking frame 203.

[0113] The width of the locking pin 202 in the left - right direction is greater than the width of the locking frame 203. Therefore, the locking pin 202 can move relative to the locking frame 203 in the left - right direction to switch between the locked state and the unlocked state.

[0114] The second ball group 204 is arranged between the cover plate 201 and the locking frame 203 and is located on the track of the locking frame 203, and enables the locking frame 203 to roll and move back and forth relative to the cover plate 201. In the locked state, the locking frame 203 cannot move back and forth by clamping the locking pin 202 on the locking frame 203. In the unlocked state, the locking pin 202 moves to the right to release the engagement between the locking pin 202 and the slot, so that the locking frame 203 can move back and forth.

[0115] The second ball group 204 includes a ball holder and balls.

[0116] As an option, a spring can also be arranged in the front - back movement module 20 to push the locking pin 202 to the left to return to the locked position.

[0117] In this embodiment, the front - back movement module 20 is located above the locking / unlocking module 10. As an option, the front - back movement module 20 can also be located below the locking / unlocking module 10, but the connection relationship between the front - back movement module 20 and the locking / unlocking module 10 needs to be adjusted adaptively.

[0118] See Figures 11A - 11B , the up - down movement guide rail module 30 includes a fixed guide rail 301, a movable guide rail 302 and a first ball group 303. The up - down movement guide rail module 30 is located inside the seat back Z, specifically in the support parts on both sides of the upper part of the seat back Z.

[0119] The fixed guide rails 301 are a pair, with a cross-sectional shape of a C-shape, and are fixed to the frame 40 by bolts, see Figure 5 and Figure 6 . The fixed guide rails 301 are in a groove shape with an opening facing the headrest T and have a plurality of locking holes along their longitudinal direction, so that the end of the locking rod 101c of the locking / unlocking module 10 can be inserted into the locking holes, thereby realizing the locking of the headrest T. The interval between each locking hole can be set as required, which defines the distance of the up-and-down movement of the headrest T.

[0120] The moving guide rail 302 is in a groove shape with an opening facing the support part, is installed inside the fixed guide rail 301 and can move up and down relative to the fixed guide rail 301. The moving guide rail 302 is provided with a perforation, so that the locking plate 101 of the locking / unlocking module 10 can pass through the perforation and be inserted into the locking hole of the fixed guide rail 301. Both the locking / unlocking module 10 and the front-and-back moving module 20 are connected to the moving guide rail 302, so as to move up and down relative to the fixed guide rail 301 through the moving guide rail 302. Specifically, the end of the bottom plate 102 of the locking / unlocking module 10 is fixed to the moving guide rail 302 by bolts, and the end of the cover plate 201 of the front-and-back moving module is also fixed to the moving guide rail 302 by bolts.

[0121] The first ball group 303 is composed of a frame and a plurality of balls located on both sides of the frame, and the first ball group 303 is arranged between the fixed guide rail 301 and the moving guide rail 302, so as to provide rolling friction for the fixed guide rail 301 and the moving guide rail 302, enabling the moving guide rail 302 to move up and down relative to the fixed guide rail 301, see Figure 12 .

[0122] In the locked state, the locking plate 101 is inserted into the locking hole of the fixed guide rail 301, so that the locking / unlocking module 10 is locked relative to the fixed guide rail 301. When unlocking, the locking plate 101 of the locking / unlocking module 10 moves to the right to release the locking between the moving guide rail 302 and the fixed guide rail 301, so that the locking / unlocking module 10 can move up and down.

[0123] See Figure 5 and Figure 6 , the frame 40 is located outside the fixed guide rail 301. On the one hand, the frame 40 is fixed to the frame of the seat backrest Z by bolts; on the other hand, the frame 40 is fixed to the fixed guide rail 301 by bolts, so that the up-and-down moving guide rail module 30 is installed inside the seat backrest Z.

[0124] The operation of the headrest capable of adjusting the direction for the seat backrest of the present invention will be described below.

[0125] When it is necessary to adjust the up-and-down position and / or the front-and-back position of the headrest, turn the knob 103a. The knob 103a drives the driving link 103c to rotate, so as to push the locking plate 101 to move rightward, causing the locking rod 101c to withdraw from the locking hole of the fixed guide rail 301, so that the main body 1 of the headrest T is in an unlocked state relative to the fixed guide rail 301. At the same time, under the push of the locking plate 101, the locking pin 202 of the front-and-back moving module 20 also moves rightward and disengages from the card slot of the locking frame 203, making the front-and-back moving module 20 also in an unlocked state. At this time, the up-and-down and front-and-back positions of the main body 1 of the headrest T can be adjusted by moving the main body 1 of the headrest in the up-and-down direction and the front-and-back direction. After the adjustment is completed, release the knob 103a. The locking plate 101 is pushed to move leftward under the restoring force of the spring 103d, causing the locking rod 101c to be inserted into the locking hole of the fixed guide rail 301 again; at the same time, the locking pin 202 also moves leftward and snaps into the card slot of the locking frame 203, so that the main body 1 of the headrest is in a locked state and cannot move in the up-and-down direction and the front-and-back direction.

[0126] Although the present invention has been described in the above embodiments in conjunction with the accompanying drawings, the structure of the present invention can be modified. For example, in the above embodiment, the knob drives the eccentric rotation of the driving link 103c to linearly move and unlock the locking plate 101. As a variant: a push rod can be provided to directly push the locking plate 101 leftward / rightward to lock / unlock the locking / unlocking assembly; or, in this embodiment, it is operated manually, but as a variant, the present invention can also be operated in an electric adjustment manner driven by a motor. For example, a motor drives a lead screw and nut to move the locking rod 101c / locking frame 203 in the left-right / front-back direction.

[0127] The headrest capable of adjusting the direction for the seat back of the present invention can improve the disadvantages of the existing headrest adjustment method of the integrated seat and realize various adjustment functions of the integrated seat. Moreover, it improves the existing locking / unlocking method of the headrest and facilitates the seat function. By optimizing the fixing method of the headrest and the rear frame, the moving feeling of the seat is maintained, and the adjustment function of the headrest is realized.

[0128] The seat back of the present invention can be used for the seat back of a vehicle seat, and can also be used for the backrests of other seats, such as other means of transportation (such as ships, airplanes, etc.), and other seats in fixed positions (such as office seats, etc.).

[0129] For the convenience of explanation and to precisely define the appended claims, the terms "upper", "lower", "inner", "outer", "upward", "downward", "front", "rear", "back", "inner side", "outer side", "inward", "outward", "interior", "exterior", "forward", "backward" are used to describe the features of the exemplary specific embodiments with reference to the positions of these features shown in the accompanying drawings. In the application documents of the present invention, forward, backward, left, right, etc. are positions determined relative to the user. For example, forward refers to the direction towards the front of the user, and backward refers to the direction towards the rear of the user.

[0130] The foregoing description of the specific exemplary embodiments of the present invention has been presented for purposes of illustration and description. The foregoing description is not intended to be exhaustive nor to limit the invention to the precise form disclosed, and obviously many changes and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain specific principles of the invention and its practical application so as to enable others skilled in the art to make and utilize various exemplary embodiments of the invention and their various alternative forms and modifications. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A headrest for a seat back that can be adjusted in direction, the headrest comprising a main body and an operation module, the operation module being connected to the main body and capable of driving the main body to move relative to the seat back in the vertical direction and the front-back direction; The operation module includes: A locking / unlocking module that controls the state of the headrest relative to the seat back; wherein, in the locked state, the headrest is fixed relative to the seat back; in the unlocked state, the headrest can move relative to the seat back; A front-back moving module that enables the headrest to move in the front-back direction; and An up-down moving guide rail module that is installed in the seat back, and the locking / unlocking module and the front-back moving module are connected to the up-down moving guide rail module so as to be able to move in the vertical direction; Wherein, the locking / unlocking module and the front-back moving module are installed inside the main body; in the unlocked state, the headrest can move in the vertical direction and / or the front-back direction through the locking / unlocking module and the front-back moving module.

2. The headrest for a seat back that can be adjusted in direction according to claim 1, wherein the locking / unlocking module includes: A bottom plate; A locking plate that is installed on the bottom plate and can move in the left-right direction to lock the locking / unlocking module on the up-down moving guide rail module; And A driving assembly that is installed on the bottom plate and can drive the locking plate to move.

3. The headrest for a seat back that can be adjusted in direction according to claim 2, wherein the bottom plate has a guide groove, and the middle part of the bottom plate has a downward recess, and the bottom of the recess has a through hole; The locking plate includes a moving frame, a guide rod and a locking rod, the guide rod is installed in the guide groove of the bottom plate, and the locking rod locks with the up-down moving guide rail module; The driving assembly includes a knob, a rotating shaft, a driving connecting rod and a spring, the knob is located below the recess of the bottom plate, the rotating shaft passes upward through the through hole of the recess, one end of the rotating shaft is fixedly connected to the knob, the other end is fixedly connected to the driving connecting rod, and the driving connecting rod has a dial rod at the end on the side opposite to the rotating shaft, and this dial rod contacts the inner side of the moving frame to push the locking plate to move.

4. The headrest for a seat back that can be adjusted in direction according to claim 3, wherein the up-down moving guide rail module includes: A pair of fixed guide rails with a U-shaped cross-section, fixed on the seat back and having a plurality of locking holes, and the locking rod can be inserted into the locking holes so that the locking / unlocking module is locked relative to the up-down moving guide rail module; And A pair of moving guide rails that are installed inside the fixed guide rails and can move relative to the fixed guide rails, and the bottom plate of the locking / unlocking module and the front-back moving module are fixedly connected to the moving guide rails.

5. The headrest capable of direction adjustment for a seat back according to claim 4, wherein the up-and-down movement guide rail module further comprises: A first ball group that is arranged between the fixed guide rails and the moving guide rails.

6. The headrest capable of direction adjustment for a seat back according to claim 3, wherein the forward and backward movement module is located above or below the locking / unlocking module, and the forward and backward movement module comprises: A cover plate, a lock pin and a lock frame; The middle part of the cover plate has a groove, and the lower end of the groove has an opening; The lock pin and the lock frame are accommodated in this groove; The lock frame is a hollow frame that can move in the front-back direction relative to the cover plate; one side of the lock frame has a plurality of card slots, and the front and rear ends of the lock frame are fixedly connected to the headrest; The lock pin is sleeved outside the lock frame and can move in the left-right direction relative to the lock frame, and one side of the lock pin has a pin for cooperating with the card slots of the lock frame.

7. The headrest capable of direction adjustment for a seat backrest according to claim 6, wherein the locking plate further includes a stepped section disposed between the guide rod and the locking rod; The lower side of the locking pin has a protrusion which cooperates with the stepped section of the locking plate, so that when the locking plate moves, the locking pin can be simultaneously pushed to move in the left-right direction, causing the pin of the locking pin to be stuck in or disengaged from the card slot of the locking bracket.

8. The headrest capable of direction adjustment for a seat backrest according to claim 7, wherein the front-back movement module further includes a ball group, and the upper and lower sides of the locking bracket respectively have tracks cooperating with the second ball group.

9. The headrest capable of direction adjustment for a seat backrest according to claim 2, wherein the operation module further includes a frame which is mounted on the seat backrest and is respectively connected to the frame of the seat backrest and the fixed guide rail.

10. The headrest capable of direction adjustment for a seat back according to claim 1, wherein the main body comprises: Headrest cover, front / rear inner cover; The headrest cover is disposed on the outermost side of the main body, and the front / rear inner cover is located inside the headrest cover. An accommodation space is formed inside the front / rear inner cover to accommodate the operation module; the front / rear inner cover is connected to the front-back movement module, so as to be able to move the headrest.

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