Four-way adjustable headrest

Abstract

A four-way adjustable headrest, relating to the technical field of automobiles. The four-way adjustable headrest comprises a sliding block (120), a base (130), an insertion rod (140), a first driving member (150), and a second driving member (160), wherein the sliding block is slidably arranged on the base, and the base is slidably arranged on the insertion rod; the first driving member is arranged on the insertion rod or the base and configured to drive the base to move along the insertion rod in a first direction; and the second driving member is arranged on the base or the sliding block and configured to drive the sliding block to move relative to the base in a second direction. The first direction is perpendicular to the second direction. The four-way adjustable headrest has the characteristics of a simpler and more compact structure and better stability.

Description

A four-way adjustable headrest Technical Field

[0001] This disclosure relates to the field of automotive technology, and more specifically, to a four-way adjustable headrest. Background Technology

[0002] Currently, some car seats on the market are equipped with four-way adjustable headrests, which can automatically adjust the height and fore-aft position.

[0003] Such headrests typically include a support body connected to a plug, front and rear sliders mounted on the support body, and a lifting slider mounted on the front and rear sliders. In practical applications, the front and rear sliders, driven by front and rear motors, cause the lifting slider to slide relative to the support body in the front-rear direction; the lifting slider, driven by a lifting motor, causes the headrest housing to move up and down.

[0004] This type of headrest has a complex structure, occupies a large space in the front-to-back direction, and forms a long cantilever structure with the front and rear sliders relative to the supporting body. The weight of the lifting slider and the headrest shell are both applied to the front and rear sliders, resulting in a harsh stress situation. This leads to an unstable overall structure and a tendency for adjustment to become stuck after prolonged use.

[0005] Public content

[0006] The purpose of this disclosure is to provide a four-way adjustable headrest that has a simpler and more compact structure and better stability.

[0007] The embodiments of this disclosure provide a technical solution:

[0008] A four-way adjustable headrest includes a sliding block, a base, a plug rod, a first driving member, and a second driving member. The sliding block is slidably disposed on the base, and the base is slidably disposed on the plug rod.

[0009] The first driving member is disposed on the insertion rod or the base and is used to drive the base to move along the insertion rod in a first direction; the second driving member is disposed on the base or the sliding block and is used to drive the sliding block to move relative to the base in a second direction, wherein the first direction is perpendicular to the second direction.

[0010] In an optional embodiment, one end of the insertion rod is provided with a fixing member, the first driving member is disposed on the fixing member, and the output end of the first driving member is connected to the base, or...

[0011] The first driving member is disposed on the base, and the output end of the first driving member is connected to the fixing member.

[0012] In an optional embodiment, the first driving member is disposed on the base, and the output end of the first driving member is provided with a first lead screw extending in the first direction;

[0013] The four-way adjustable headrest also includes a first nut, which is connected to the fixing member and threadedly engaged with the first lead screw.

[0014] The first driving component is used to drive the first lead screw to rotate, thereby causing the first nut to move along the first lead screw.

[0015] In an optional embodiment, a clearance cavity is provided on the base on one side corresponding to the fastener, and the clearance cavity is used for the fastener to be embedded.

[0016] In an optional embodiment, the fastener has a positioning groove, and a mating groove is provided on the outer side wall of the first nut. The two opposite side walls of the positioning groove are embedded in the mating groove to position the first nut.

[0017] In an optional embodiment, the fastener further has a mounting hole, the diameter of which is greater than the width of the positioning groove; the mounting hole communicates with one end of the positioning groove.

[0018] In an optional embodiment, the fastener also has an anti-disengagement groove, and the first nut is provided with an elastic hook that is embedded in the anti-disengagement groove.

[0019] In an optional embodiment, the elastic hook includes a rod extending outward from the sidewall of the first nut and a hook at the end of the rod, the hook abutting against the sidewall of the anti-disengagement groove to restrict the first nut from sliding out of the positioning groove.

[0020] In an optional embodiment, the second driving member is disposed on the sliding block, and the output end of the second driving member is provided with a second lead screw extending in the second direction;

[0021] The four-way adjustable headrest also includes a second nut, which is connected to the base and threadedly engaged with the second lead screw.

[0022] The second driving member is used to drive the second lead screw to rotate, thereby causing the second nut to move along the second lead screw.

[0023] In an optional embodiment, the base has a recessed mounting groove on one side in the first direction, and the second nut is inserted into the mounting groove.

[0024] In an optional embodiment, one of the base and the sliding block has a guide groove that extends in the second direction;

[0025] The other one of them has a guide slide portion that extends into the guide slide groove and slides in cooperation with the guide slide groove.

[0026] In an optional embodiment, the four-way adjustable headrest further includes an elastic tensioning member, and the elastic tensioning member is provided on two opposite sidewalls of the guide groove in the first direction, and the elastic tensioning member abuts against the guide part.

[0027] In an optional embodiment, when the sliding block moves to its limit position near the base in the second direction, the first driving member and the second driving member at least partially overlap in the first direction.

[0028] In an optional embodiment, one of the base and the insertion rod has a limiting groove, the limiting groove extending in the first direction and being closed at at least one end;

[0029] The other one of them is provided with a limiting member, which extends into the limiting groove and slides in cooperation with the limiting groove.

[0030] In an optional embodiment, the four-way adjustable headrest further includes a sliding bushing, which is detachably connected to the base and slidably fitted onto the outer wall of the insert rod.

[0031] In an optional implementation, with the car as the reference standard, the first direction is the vertical direction and the second direction is the front-to-back direction.

[0032] Compared to existing technologies, the four-way adjustable headrest provided in this disclosure has a base slidably mounted on the insertion rod, and a sliding block slidably mounted on the base. The base moves along the insertion rod in a first direction under the drive of a first driving member, and the sliding block moves relative to the base in a second direction under the drive of a second driving member. In typical practical applications, the first direction is the height direction, and the second direction is the front-to-back direction. The sliding block is used to mount the headrest housing, enabling adjustment of the height and front-to-back position of the headrest housing. Therefore, this four-way adjustable headrest eliminates the need for a support body fixedly connected to the insertion rod. The liftable base directly engages with the insertion rod, avoiding excessive weight concentration on the cantilevered sliding block, optimizing the stress distribution, and reducing space occupation in the front-to-back direction. Thus, the beneficial effects of the four-way adjustable headrest provided in this disclosure include: a simpler and more compact structure and better stability. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 is an exploded view of a four-way adjustable headrest provided in an embodiment of this disclosure;

[0035] Figure 2 is a schematic diagram of the connection structure between the base and the insertion rod from one perspective.

[0036] Figure 3 is an exploded view of the structure shown in Figure 2;

[0037] Figure 4 is a schematic diagram of the connection structure between the first nut and the fastener in one state;

[0038] Figure 5 is a schematic diagram of the connection structure between the first nut and the fastener in another state;

[0039] Figure 6 is an exploded view of the structure shown in Figure 5;

[0040] Figure 7 is a schematic diagram of the connection structure of the base, sliding block and plug rod from one perspective.

[0041] Figure 8 is a cross-sectional schematic diagram of the structure shown in Figure 7;

[0042] Figure 9 is a schematic diagram of the connection structure of the base, sliding block and plug rod from another perspective;

[0043] Figure 10 is a cross-sectional schematic diagram of the structure shown in Figure 9;

[0044] Figure 11 is a schematic diagram of the connection structure between the base and the insertion rod from another perspective;

[0045] Figure 12 is a cross-sectional schematic diagram of the four-way adjustable headrest when the sliding block is in the extreme position close to the base;

[0046] Figure 13 is a schematic diagram of the connection structure between the sliding block and the base in Figure 12;

[0047] Figure 14 is a cross-sectional schematic diagram of the four-way adjustable headrest when the sliding block is in the extreme position far away from the base;

[0048] Figure 15 is a schematic diagram of the connection structure between the sliding block and the base in Figure 14;

[0049] Figure 16 is a schematic diagram of the sliding block from one perspective;

[0050] Figure 17 is a schematic diagram of the sliding block from another perspective;

[0051] Figure 18 is a schematic diagram of the base structure;

[0052] Figure 19 is an enlarged schematic diagram of region A in Figure 18;

[0053] Figure 20 is an exploded view of the connection structure between the second nut and the base;

[0054] Figure 21 is an enlarged schematic diagram of region B in Figure 20;

[0055] Figure 22 is a schematic diagram of the connection structure between the second driving component and the sliding block;

[0056] Figure 23 is an exploded view of the structure shown in Figure 22.

[0057] Icons: 100-Four-way adjustable headrest; 110-Housing shell; 111-Accommodation space; 120-Sliding block; 121-Guide slide; 130-Base; 131-Relief cavity; 132-Mounting groove; 133-Guide slide groove; 134-Limiting groove; 140-Insertion rod; 141-Limiting component; 150-First driving component; 151-First lead screw; 152-First shock-absorbing pad; 160-Second driving component; 161-Second lead screw; 162-Second shock-absorbing pad; 170-Fixing component; 171-Positioning groove; 172-Mounting hole; 173-Anti-detachment groove; 180-First nut; 181-Matching groove; 182-Elastic hook; 1821-Rod part; 1822-Hook part; 190-Second nut; 191-Elastic tensioning component; 192-Sliding bushing. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] In the description of this disclosure, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the disclosed product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0062] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0063] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, terms such as "setup" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0064] The specific embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0065] Example

[0066] Please refer to Figure 1, which is an exploded view of the four-way adjustable headrest 100 provided in this embodiment.

[0067] The four-way adjustable headrest 100 provided in this embodiment is applied to a car seat and specifically includes a housing 110, a sliding block 120, a base 130, a plug rod 140, a first drive member 150, and a second drive member 160. The sliding block 120, the base 130, the first drive member 150, and the second drive member 160 are all disposed inside the housing 110. One end of the plug rod 140 extends into the housing 110, and the other end is used to connect with the car seat. The base 130 is slidably disposed on the plug rod 140, and the sliding block 120 is slidably disposed on the base 130 and connected to the housing 110.

[0068] The housing 110 includes a front cover and a rear cover that interlock. The front cover is connected to a sliding block 120, and the front cover and the rear cover together form an accommodating space 111 (refer to Figures 12 and 14). The sliding block 120, the base 130, the first driving member 150, and the second driving member 160 are all housed within this accommodating space 111, making the overall structure more compact. Furthermore, the electrical terminals of the first driving member 150 and the second driving member 160 can be integrated into one end of the insertion rod 140 that extends out of the housing 110, thereby enabling hot-swapping of the four-way adjustable headrest 100 in practical applications.

[0069] A first driving member 150 is disposed on a base 130 and is used to drive the base 130 to move along the insertion rod 140 in a first direction. A second driving member 160 is disposed on a sliding block 120 and is used to drive the sliding block 120 to move relative to the base 130 in a second direction, wherein the first direction is perpendicular to the second direction.

[0070] In fact, using a car as a reference standard, the first direction is the vertical direction, and the second direction is the front-to-back direction. During the vertical movement of the base 130 driven by the first driving component 150, the base 130, through the sliding block 120, drives the housing 110 to move synchronously in the vertical direction, thereby adjusting the height of the housing 110. Similarly, during the front-to-back movement of the sliding block 120 driven by the second driving component 160, the sliding block 120 drives the housing 110 to move synchronously in the front-to-back direction, thereby adjusting the front-to-back position of the housing 110.

[0071] As can be seen, in this embodiment, the four-way adjustable headrest 100 has its base 130 slidably mounted on the insert rod 140, and the sliding block 120 slidably mounted on the base 130. This eliminates the need to fix a support body on the insert rod 140 and avoids excessive weight concentration on the cantilevered sliding block 120, thus optimizing the overall structural stress and reducing the space occupied in the front-to-back direction. Therefore, the four-way adjustable headrest 100 provided in this disclosure has the characteristics of simpler and more compact structure and better stability.

[0072] In another embodiment, the specific positions of the first driving member 150 and the second driving member 160 can be adjusted according to the actual application conditions. For example, the first driving member 150 can be set on the insertion rod 140, and the second driving member 160 can be set on the base 130.

[0073] Please refer to Figures 2 and 3. Figure 2 shows a schematic diagram of the connection structure between the base 130 and the insertion rod 140 from one perspective, and Figure 3 shows an exploded schematic diagram of the structure shown in Figure 2.

[0074] In fact, in this embodiment, a fixing member 170 is provided at one end of the insertion rod 140 that extends into the housing 110. The first driving member 150 is disposed on the base 130 and the output end of the first driving member 150 is connected to the fixing member 170. During operation, the first driving member 150 drives the base 130 to move closer to or further away from the fixing member 170 along the insertion rod 140, thereby adjusting the height position of the housing 110.

[0075] In another embodiment, the first driving member 150 can be disposed on the fixing member 170 at the end of the insertion rod 140, and the output end of the first driving member 150 can be connected to the base 130. In this case, during the movement of the first driving member 150, the base 130 can also be moved along the insertion rod 140 closer to or away from the fixing member 170.

[0076] Preferably, in this embodiment, the first driving member 150 is a rotary motor mounted on the base 130, and its output end is provided with a first lead screw 151 extending in a first direction. The four-way adjustable headrest 100 also includes a first nut 180, which is connected to the fixing member 170 and threadedly engaged with the first lead screw 151. The first driving member 150 is used to drive the first lead screw 151 to rotate, thereby causing the first nut 180 to move along the first lead screw 151.

[0077] It is understandable that the first nut 180 is installed on the fixing member 170. When the first driving member 150 drives the first lead screw 151 to rotate, the first lead screw 151 rotates relative to the first nut 180 and also moves in the first direction, thereby driving the base 130 to move along the insertion rod 140 in the first direction, so as to realize the height position adjustment of the housing 110.

[0078] In the embodiment where the first drive member 150 is disposed on the fixing member 170, the first nut 180 can be fixed to the base 130, or integrally formed with the base 130. Furthermore, in other embodiments, other driving methods can be used instead of the lead screw and nut combination in this embodiment. For example, the first drive member 150 can also be a linear motor, mounted on either the base 130 or the fixing member 170, with its output end connected to the other one.

[0079] The four-way adjustable headrest 100 provided in this embodiment also includes a first shock-absorbing pad 152. The first shock-absorbing pad 152 is disposed between the first driving member 150 and the base 130, and plays the role of isolating vibration transmission, preventing the vibration of the first driving member 150 from being transmitted to the base 130 during operation and reducing noise.

[0080] To facilitate the smooth relocation of the fixing member 170 to achieve a greater upward stroke, in this embodiment, a relocation cavity 131 is provided on one side of the base 130 corresponding to the fixing member 170. The relocation cavity 131 is used for the fixing member 170 to be embedded. That is, a relocation cavity 131 is provided at the top of the base 130. During the upward movement of the base 130 along the insertion rod 140 driven by the first driving member 150, the fixing member 170 can be embedded in the relocation cavity 131, thereby increasing the maximum upward stroke of the base 130.

[0081] In order to eliminate assembly errors between the insertion rod 140 and the base 130, reduce friction, and ensure smooth sliding of the base 130 on the insertion rod 140, the four-way adjustable headrest 100 provided in this embodiment also includes a sliding bushing 192. The sliding bushing 192 is detachably connected to the base 130, and the sliding bushing 192 is slidably sleeved on the outer side wall of the insertion rod 140.

[0082] Understandably, during assembly, the sliding bushing 192 is first installed on the base 130, and then the base 130 drives the sliding bushing 192 to be fitted onto the insert rod 140. In the assembled state, one end of the insert rod 140 that extends into the housing 110 passes through the sliding bushing 192 and connects to the fixing member 170.

[0083] Please refer to Figures 4, 5 and 6. Figure 4 shows a schematic diagram of the connection structure between the first nut 180 and the fastener 170 in one state. Figure 5 shows a schematic diagram of the connection structure between the first nut 180 and the fastener 170 in another state. Figure 6 shows an exploded view of the structure shown in Figure 5.

[0084] In this embodiment, for ease of assembly, the first nut 180 is installed on the fixing member 170 by a snap-fit ​​method, and the two can be repeatedly disassembled and reassembled. In another embodiment, depending on the actual application conditions, the first nut 180 can also be connected to the fixing member 170 in other detachable ways, such as threaded engagement. The first nut 180 can also be fixed to the fixing member 170 by welding or other methods, or it can be integrally formed with the fixing member 170.

[0085] Specifically, in this embodiment, the fixing member 170 has a positioning groove 171, and the outer side wall of the first nut 180 is provided with a mating groove 181. The two opposite side walls of the positioning groove 171 are embedded in the mating groove 181 to position the first nut 180.

[0086] It is understandable that the two sidewalls of the positioning groove 171 are embedded in the mating groove 181 on the outer sidewall of the first nut 180 to achieve the snap-fit ​​of the first nut 180 and restrict the first nut 180 from moving in the vertical direction relative to the fixing member 170.

[0087] To facilitate the insertion of the first nut 180 into the positioning groove 171, in this embodiment, the fixing member 170 also has a mounting hole 172, the diameter of which is larger than the width of the positioning groove 171. The mounting hole 172 is connected to one end of the positioning groove 171.

[0088] In fact, the mounting hole 172 serves to assist in the assembly of the first nut 180, and the area of ​​the mounting hole 172 is larger than the cross-sectional area of ​​the first nut 180. During assembly, one end of the first nut 180 is first inserted into the mounting hole 172 until the mating groove 181 circumferentially formed on the outer wall of the first nut 180 is horizontally aligned with the positioning groove 171. After alignment, a force is applied to drive the first nut 180 to slide horizontally into the positioning groove 171. During this process, the two sidewalls of the positioning groove 171 are embedded into the mating groove 181.

[0089] In practical applications, if there is a lack of restraint on the first nut 180 in the extending direction of the positioning groove 171 when it is engaged with the positioning groove 171, the first nut 180 may be forced out of the positioning groove 171 and enter the mounting hole 172, thus detaching from the fixing member 170. To solve this problem, in this embodiment, the fixing member 170 also has an anti-detachment groove 173, and the first nut 180 is provided with an elastic hook 182, which is embedded in the anti-detachment groove 173.

[0090] Specifically, the elastic hook 182 includes a rod 1821 extending outward from the side wall of the first nut 180 and a hook 1822 located at the end of the rod 1821. The hook 1822 abuts against the side wall of the anti-disengagement groove 173 to restrict the first nut 180 from sliding in the direction of exiting the positioning groove 171.

[0091] To facilitate molding and assembly, the anti-detachment groove 173 in this embodiment is formed on the side wall of the mounting hole 172 away from the positioning groove 171. When installing the first nut 180, after one end of the first nut 180 is inserted into the mounting hole 172, its rod portion 1821 bends and deforms, and the hook portion 1822 abuts against the surface of the fixing member 170. During the process of the first nut 180 sliding horizontally into the positioning groove 171, the hook portion 1822 slides on the surface of the fixing member 170 and gradually approaches the anti-detachment groove 173. When the first nut 180 slides into place in the positioning groove 171, the hook portion 1822 is just embedded in the anti-detachment groove 173 and is opposite to the side wall of the anti-detachment groove 173 away from the positioning groove 171, so as to prevent the first nut 180 from sliding close to the mounting hole 172.

[0092] As can be seen, Figure 4 shows the state when the first nut 180 and the fastener 170 are assembled, and Figure 5 shows the state after the first nut 180 extends into the mounting hole 172 and before it slides into the positioning groove 171.

[0093] In the state shown in Figure 4, if it is necessary to disassemble the first nut 180, simply push the hook 1822 of the elastic hook 182 upward from the bottom of the fixing member 170 to make it exit the anti-disengagement groove 173, and then apply force to the first nut 180 to make it slide into the mounting hole 172.

[0094] Please refer to Figures 7 and 8. Figure 7 shows a schematic diagram of the connection structure of the base 130, sliding block 120 and plug rod 140 from one perspective. Figure 8 shows a cross-sectional schematic diagram of the structure shown in Figure 7.

[0095] In the state shown in Figure 7, the base 130 is in the lower limit position, and the sliding block 120 is in the rear limit position, that is, the sliding block 120 is in the limit position closest to the base 130. In this state, the housing 110 is in the lowest and rearmost position.

[0096] Please refer to Figures 9 and 10. Figure 9 shows a schematic diagram of the connection structure of the base 130, sliding block 120 and plug rod 140 from another perspective. Figure 10 shows a cross-sectional schematic diagram of the structure shown in Figure 9.

[0097] In the state shown in Figure 9, the base 130 is in the upper limit position and the sliding block 120 is in the rear limit position. In this state, the housing 110 is in the highest and rearmost position.

[0098] To further reduce the size of the four-way adjustable headrest 100 in the front-to-back direction and to increase the adjustable range of the housing 110 in the front-to-back direction, in this embodiment, the first drive member 150 and the second drive member 160 are spaced apart in the vertical direction, and the second drive member 160 is located below the first drive member 150. When the sliding block 120 moves to its limit position closest to the base 130, the first drive member 150 and the second drive member 160 at least partially overlap in the first direction, that is, at least partially overlap in the vertical direction.

[0099] In practical applications, the space below the first driving member 150 provides room for the second driving member 160, which is equivalent to making room for the sliding block 120 in the front-back direction. This allows the housing 110 to be adjusted in a wider range in the front-back direction and effectively reduces the overall size of the structure in the front-back direction.

[0100] Please refer to Figure 11, which shows a schematic diagram of the connection structure between the base 130 and the insertion rod 140 from another perspective.

[0101] In order to limit the vertical movement of the base 130, in this embodiment, the base 130 has a limiting groove 134, which extends in a first direction and is closed at least at one end. The insert rod 140 is provided with a limiting member 141, which extends into the limiting groove 134 and slides in cooperation with the limiting groove 134.

[0102] Preferably, in this embodiment, the limiting groove 134 is closed at both ends. During the process of the base 130 sliding upward along the insertion rod 140, the limiting member 141 moves downward relative to the limiting groove 134 until the limiting member 141 contacts the bottom groove wall of the limiting groove 134, thus restricting the base 130 from sliding further upward and positioning the base 130 at the upper limit position.

[0103] As the base 130 slides downward along the insertion rod 140, the limiting member 141 moves upward relative to the limiting groove 134 until the limiting member 141 contacts the top wall of the limiting groove 134, thus restricting the base 130 from further downward interaction and positioning the base 130 at the lower limit position, as shown in Figure 11.

[0104] In another embodiment, the limiting groove 134 can be formed on the insert rod 140, and a limiting member 141 can be provided on the base 130 accordingly. The limiting member 141 and the limiting groove 134 can also limit the base 130. Furthermore, the combination of the limiting groove 134 and the limiting member 141 can be omitted. A limiting part can be provided on the first lead screw 151. By limiting the relative movement stroke of the first nut 180 in the vertical direction, the limiting part can also limit the base 130.

[0105] Please refer to Figures 12 to 15. Figure 12 shows a cross-sectional view of the four-way adjustable headrest 100 when the sliding block 120 is in the extreme position close to the base 130. Figure 13 shows a schematic diagram of the connection structure between the sliding block 120 and the base 130 in Figure 12. Figure 14 shows a cross-sectional view of the four-way adjustable headrest 100 when the sliding block 120 is in the extreme position far away from the base 130. Figure 15 shows a schematic diagram of the connection structure between the sliding block 120 and the base 130 in Figure 14.

[0106] In this embodiment, the second driving member 160 is disposed on the sliding block 120, and the output end of the second driving member 160 is provided with a second lead screw 161 extending in a second direction. The four-way adjustable headrest 100 also includes a second nut 190, which is connected to the base 130 and threadedly engaged with the second lead screw 161. The second driving member 160 is used to drive the second lead screw 161 to rotate, thereby causing the second nut 190 to move along the second lead screw 161.

[0107] It is understandable that the second nut 190 is mounted on the base 130. When the second drive member 160 drives the second lead screw 161 to rotate, the second lead screw 161 rotates relative to the second nut 190 and also moves in the second direction, that is, in the front-back direction, thereby driving the sliding block 120 to move in the front-back direction, so as to realize the front-back position adjustment of the housing 110.

[0108] In the embodiment where the second drive member 160 is disposed on the base 130, the second nut 190 can be mounted on the sliding block 120. In other embodiments, other driving methods can be used instead of the combination of the second lead screw 161 and the second nut 190 in this embodiment. For example, the second drive member 160 can also be a linear motor, mounted on one of the sliding block 120 or the base 130, with its output end connected to the other one.

[0109] Please refer to Figures 16 to 18. Figure 16 shows a schematic diagram of the sliding block 120 from one perspective, Figure 17 shows a schematic diagram of the sliding block 120 from another perspective, and Figure 18 shows a schematic diagram of the base 130.

[0110] In this embodiment, the base 130 has a guide groove 133 that extends in a second direction. The sliding block 120 has a guide portion 121 that extends into the guide groove 133 and slides in cooperation with it. Through the combination of the guide portion 121 and the guide groove 133, the sliding block 120 is slidably mounted on the base 130.

[0111] In practical applications, during the process of the second driving member 160 driving the sliding block 120 to move relative to the base 130 in the second direction, the guide slide 121 slides along the guide slide groove 133. In order to achieve stable support for the sliding block 120 and ensure smooth sliding, in this embodiment, there are multiple guide slides 121 and multiple guide slide grooves 133, and the multiple guide slides 121 and multiple guide slide grooves 133 are matched one-to-one.

[0112] Furthermore, in the assembled state, at least two guide slides 121 are spaced apart in the first direction, that is, at least two guide slides 121 are spaced apart in the vertical direction to optimize the cantilever state of the sliding block 120 and provide stronger support for the sliding block 120. Additionally, at least two guide slides 121 are spaced apart in a third direction, which is perpendicular to the first and second directions. Using the vehicle as a reference standard, the third direction is the left-right direction, ensuring that the sliding block 120 moves smoothly and without wobbling.

[0113] In this embodiment, the guide slide 121 and the guide slide groove 133 have a limiting engagement structure for restricting the movement stroke of the sliding block 120. In practical applications, when the sliding block 120 moves away from the base 130 until the limiting engagement structure completes engagement, the sliding block 120 is at its extreme position away from the base 130. Due to the restriction of the limiting engagement structure, the sliding block 120 cannot continue to move away from the base 130. When the sliding block 120 moves towards the base 130 until the second drive member 160 contacts the second nut 190, the sliding block 120 is at its extreme position near the base 130 and cannot continue to move towards the base 130.

[0114] In another embodiment, a guide slide 121 can be provided on the base 130, and a guide slide groove 133 can be provided on the sliding block 120. Through the cooperation of the guide slide groove 133 and the guide slide 121, the sliding block 120 can also be slidably installed on the base 130.

[0115] Please refer to Figure 19, which is an enlarged schematic diagram of region A in Figure 18.

[0116] The four-way adjustable headrest 100 provided in this embodiment also includes an elastic tensioning member 191. The guide slide groove 133 is provided with elastic tensioning members 191 on the two opposite sidewalls of the groove in the first direction. The elastic tensioning member 191 abuts against the guide slide part 121.

[0117] In practice, the two vertical surfaces of the guide slide 121 abut against the two elastic tensioners 191 respectively, while they do not contact the corresponding sidewalls of the guide slide groove 133. In other words, the guide slide groove 133 limits the vertical movement of the guide slide 121 through the elastic tensioners 191. In this embodiment, the elastic tensioner 191 is a curved spring sheet, and the convex arc surface of the spring sheet abuts against the surface of the guide slide 121.

[0118] By configuring the elastic tensioner 191, on the one hand, a preload is continuously provided for the assembly of the guide slide 121 within the guide slide groove 133, compensating for the adverse effects caused by dimensional tolerances, i.e., preventing the sliding block 120 from shaking or loosening. On the other hand, it reduces the sliding friction of the guide slide 121 and helps the guide slide 121 to start and stop smoothly within the guide slide groove 133, ensuring a smooth and stable adjustment process.

[0119] Please refer to Figures 20 and 21. Figure 20 shows an exploded view of the connection structure between the second nut 190 and the base 130, and Figure 21 shows an enlarged view of area B in Figure 20.

[0120] In this embodiment, to reduce assembly difficulty, the base 130 has a recessed mounting groove 132 on one side in the first direction, and the second nut 190 is inserted into the mounting groove 132. In fact, the opening of the mounting groove 132 faces upwards and is located on the bottom wall of the relief cavity 131. During assembly, the second nut 190 can be inserted downwards into the mounting groove 132 through the relief cavity 131.

[0121] With the second nut 190 embedded in the mounting groove 132, the groove wall of the mounting groove 132 prevents the second nut 190 from moving in the horizontal direction, so that when the second drive member 160 drives the second lead screw 161 to rotate, the second nut 190 can remain fixed relative to the base 130, thereby driving the sliding block 120 to move closer to or away from the base 130 in the front-back direction.

[0122] In another embodiment, the second nut 190 can also be connected to the base 130 in other detachable ways, or it can be fixed to the base 130 by means such as welding, or it can be integrally formed with the base 130.

[0123] Please refer to Figures 22 and 23. Figure 22 shows a schematic diagram of the connection structure between the second driving member 160 and the sliding block 120, and Figure 23 shows an exploded schematic diagram of the structure shown in Figure 22.

[0124] The four-way adjustable headrest 100 provided in this embodiment also includes a second shock-absorbing pad 162. The second shock-absorbing pad 162 is disposed between the second driving member 160 and the sliding block 120. The second driving member 160 is a rotary motor. The second shock-absorbing pad 162 is provided with a through hole to allow the shaft of the second driving member 160 to rotate.

[0125] Understandably, the second damping pad 162 also serves to isolate vibration transmission, preventing vibration from the second drive component 160 from being transmitted to the sliding block 120 and reducing noise.

[0126] In summary, the four-way adjustable headrest 100 provided in this disclosure has the characteristics of simpler and more compact structure and better stability.

[0127] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A four-way adjustable headrest, characterized in that, It includes a sliding block (120), a base (130), a plug rod (140), a first driving member (150) and a second driving member (160). The sliding block (120) is slidably disposed on the base (130), and the base (130) is slidably disposed on the plug rod (140). The first driving member (150) is disposed on the insertion rod (140) or the base (130) and is used to drive the base (130) to move along the insertion rod (140) in a first direction; the second driving member (160) is disposed on the base (130) or the sliding block (120) and is used to drive the sliding block (120) to move relative to the base (130) in a second direction, wherein the first direction is perpendicular to the second direction.

2. The four-way adjustable headrest according to claim 1, characterized in that, One end of the insertion rod (140) is provided with a fixing member (170), the first driving member (150) is disposed on the fixing member (170), and the output end of the first driving member (150) is connected to the base (130), or, The first driving member (150) is disposed on the base (130), and the output end of the first driving member (150) is connected to the fixing member (170).

3. The four-way adjustable headrest according to claim 2, characterized in that, The first driving member (150) is disposed on the base (130), and the output end of the first driving member (150) is provided with a first lead screw (151) extending in the first direction; The four-way adjustable headrest (100) also includes a first nut (180), which is connected to the fixing member (170) and threadedly engaged with the first lead screw (151); The first driving member (150) is used to drive the first lead screw (151) to rotate, thereby causing the first nut (180) to move along the first lead screw (151).

4. The four-way adjustable headrest according to claim 3, characterized in that, A relief cavity (131) is provided on one side of the base (130) corresponding to the fastener (170), and the relief cavity (131) is used for the fastener (170) to be embedded.

5. The four-way adjustable headrest according to claim 3, characterized in that, The fastener (170) has a positioning groove (171), and the outer sidewall of the first nut (180) is provided with a mating groove (181). The two opposite sidewalls of the positioning groove (171) are embedded in the mating groove (181) to position the first nut (180).

6. The four-way adjustable headrest according to claim 5, characterized in that, The fastener (170) also has a mounting hole (172), the diameter of which is greater than the width of the positioning groove (171); the mounting hole (172) is connected to one end of the positioning groove (171).

7. The four-way adjustable headrest according to claim 5, characterized in that, The fastener (170) also has an anti-detachment groove (173), and the first nut (180) is provided with an elastic hook (182), which is embedded in the anti-detachment groove (173).

8. The four-way adjustable headrest according to claim 7, characterized in that, The elastic hook (182) includes a rod (1821) extending outward from the side wall of the first nut (180) and a hook (1822) located at the end of the rod (1821). The hook (1822) abuts against the side wall of the anti-disengagement groove (173) to restrict the first nut (180) from sliding in the direction of exiting the positioning groove (171).

9. The four-way adjustable headrest according to claim 1, characterized in that, The second driving member (160) is disposed on the sliding block (120), and the output end of the second driving member (160) is provided with a second lead screw (161) extending in the second direction; The four-way adjustable headrest (100) also includes a second nut (190), which is connected to the base (130) and threadedly engaged with the second lead screw (161); The second drive member (160) is used to drive the second lead screw (161) to rotate, thereby causing the second nut (190) to move along the second lead screw (161).

10. The four-way adjustable headrest according to claim 9, characterized in that, The base (130) has a recessed mounting groove (132) on one side in the first direction, and the second nut (190) is inserted into the mounting groove (132).

11. The four-way adjustable headrest according to claim 1, characterized in that, One of the base (130) and the sliding block (120) has a guide groove (133) that extends in the second direction; The other of the two has a guide slide (121) that extends into the guide slide groove (133) and slides in cooperation with the guide slide groove (133).

12. The four-way adjustable headrest according to claim 11, characterized in that, The four-way adjustable headrest (100) also includes an elastic tensioning member (191). The elastic tensioning member (191) is provided on the two opposite sidewalls of the guide groove (133) in the first direction. The elastic tensioning member (191) abuts against the guide part (121).

13. The four-way adjustable headrest according to claim 1, characterized in that, When the sliding block (120) moves to its limit position near the base (130) in the second direction, the first driving member (150) and the second driving member (160) at least partially overlap in the first direction.

14. The four-way adjustable headrest according to claim 1, characterized in that, One of the base (130) and the insertion rod (140) has a limiting groove (134), which extends in the first direction and is closed at at least one end; The other of the two is provided with a limiting member (141), which extends into the limiting groove (134) and slides in cooperation with the limiting groove (134).

15. The four-way adjustable headrest according to claim 1, characterized in that, The four-way adjustable headrest also includes a sliding bushing (192), which is detachably connected to the base (130) and is slidably fitted onto the outer wall of the insert rod (140).

16. The four-way adjustable headrest according to claim 1, characterized in that, Using a car as a reference standard, the first direction is the vertical direction, and the second direction is the front-to-back direction.

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