A multi-directional extension mechanism, leg rest and car seat

Abstract

The utility model relates to the technical field of automobile seat, disclose a multidirectional extension mechanism, leg rest and automobile seat, this multidirectional extension mechanism, include: installation main part is equipped with telescopic drive structure and gear structure, longitudinal extension spare, the movable setting is in installation main part, is equipped with first rack structure on longitudinal extension spare, and telescopic drive structure can drive longitudinal extension spare along longitudinal telescopic motion, simultaneously first rack structure makes gear structure rotate, first transverse extension spare and second transverse extension spare are equipped with second rack structure and third rack structure respectively, and mesh with gear structure respectively, longitudinal extension spare longitudinal telescopic, and drive gear structure to rotate through first rack structure when, gear structure mesh transmission second rack structure and third rack structure, make first transverse extension spare and second transverse extension spare simultaneous transverse telescopic motion. The utility model has the advantages of good motion stability, small space occupation and simple structure.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to a multi-directional extension mechanism, a leg rest, and an automotive seat. Background Technology

[0002] Due to the vehicle's design, the leg rests are limited in width, resulting in insufficient support for passengers' legs in the width direction. When passengers' feet are slightly spread outwards, they will feel the risk of slipping, leading to a poor experience.

[0003] This problem can be effectively solved by adding a width extension function to the existing longitudinally extendable leg rest. During use, the leg rest extends laterally in both the longitudinal and width directions simultaneously, increasing the width support of the leg rest without changing the original vehicle body environment. Achieving simultaneous longitudinal and lateral extension of the leg rest requires a multi-directional extension mechanism. Existing leg rests are generally driven by a linkage mechanism. In the initial stage of movement, the force exerted by the linkage is large, and the force changes continuously with the linkage angle, resulting in poor stability of the leg rest extension. Furthermore, the linkage mechanism occupies a large amount of space.

[0004] Besides leg rests, car seat headrests and tray tables also present usage scenarios requiring both longitudinal and lateral extension, which can be achieved through multi-directional extension mechanisms. However, existing multi-directional extension mechanisms suffer from poor motion stability, large space requirements, and complex structures. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a multi-directional extension mechanism, leg support and car seat with good motion stability, small space occupation and simple structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is to propose a multi-directional extension mechanism, comprising:

[0007] The mounting body is equipped with a telescopic drive structure and a gear structure;

[0008] A longitudinal extension member is movably mounted on the mounting body. The longitudinal extension member is provided with a first rack structure, and the first rack structure meshes with the gear structure. The telescopic drive structure can drive the longitudinal extension member to telescopically extend and retract along the longitudinal direction, while the first rack structure causes the gear structure to rotate.

[0009] A first lateral extension and a second lateral extension are movably mounted on the mounting body. The first lateral extension is provided with a second rack structure, and the second lateral extension is provided with a third rack structure. The second rack structure and the third rack structure respectively mesh with the gear structure.

[0010] When the longitudinal extension extends and retracts longitudinally, and drives the gear structure to rotate through the first rack structure, the gear structure meshes with the second rack structure and the third rack structure, causing both the first transverse extension and the second transverse extension to move laterally simultaneously.

[0011] Furthermore, the second rack structure and the third rack structure are respectively disposed on opposite sides of the gear structure and are arranged in a rotationally symmetrical manner.

[0012] Furthermore, the second rack structure and the third rack structure are arranged in parallel and are both perpendicular to the first rack structure;

[0013] The lateral extension and retraction directions of the first and second lateral extensions are perpendicular to the retraction and retraction directions of the longitudinal extension.

[0014] Furthermore, lateral slide rails are provided between the first lateral extension member and the mounting body, and between the second lateral extension member and the mounting body;

[0015] A longitudinal slide rail is provided between the longitudinal extension and the mounting body.

[0016] Furthermore, the longitudinal extension member is provided with a longitudinal guide groove along its own extension and contraction direction, and the first transverse extension member and the second transverse extension member are provided with transverse guide grooves along their own extension and contraction direction.

[0017] The mounting body is provided with a first guide slide and a second guide slide, the first guide slide is disposed in the longitudinal guide slide groove, and the second guide slide is disposed in the transverse guide slide groove.

[0018] Furthermore, the telescopic drive structure is configured as a lead screw motor, and the output lead screw of the lead screw motor is provided with a sliding nut that can slide along it, and the sliding nut is fixedly connected to the longitudinal extension member.

[0019] Furthermore, the gear structure is configured as a single gear, with the first rack structure, the second rack structure, and the third rack structure meshing with the single gear, and the longitudinal extension, the first lateral extension, and the second lateral extension moving synchronously and with equal strokes.

[0020] Furthermore, the gear structure is configured as a first gear and a second gear that are coaxially arranged and rotate synchronously, the first rack structure meshes with the first gear, and the second rack structure and the third rack structure mesh with the second gear respectively;

[0021] The pitch circle diameter and number of teeth of the first gear and the second gear are different, so that the longitudinal extension, the first transverse extension and the second transverse extension can move simultaneously, and the extension stroke of the longitudinal extension is not equal to the extension stroke of the first transverse extension and the second transverse extension.

[0022] This utility model also proposes a leg support, which is equipped with the aforementioned multi-directional extension mechanism, enabling the leg support to extend both longitudinally and laterally simultaneously.

[0023] This utility model also proposes a car seat, characterized in that the car seat is equipped with a headrest and / or a table, and the headrest and / or the table is equipped with the aforementioned multi-directional extension mechanism.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] In this invention, a gear structure is provided on the mounting body, and a first rack structure, a second rack structure, and a third rack structure are respectively provided on the longitudinal extension, the first transverse extension, and the second transverse extension. When the telescopic drive structure drives the longitudinal extension to extend and retract longitudinally, the first rack structure on the longitudinal extension drives the gear structure to rotate, and the rotation of the gear structure drives the first and second transverse extensions to extend and retract laterally synchronously, achieving simultaneous longitudinal and transverse extension, thus achieving multi-directional extension. The forces on the first and second transverse extensions remain unchanged during the transverse extension process, meaning that the movement of the first and second transverse extensions is stable, thereby ensuring good overall movement stability of the multi-directional extension mechanism. Furthermore, the overall structure of the multi-directional extension mechanism is simple and occupies little space.

[0026] In one implementation of this utility model, the gear structure is configured as a single gear, which simultaneously meshes with the first rack structure, the second rack structure, and the third rack structure. This ensures that when the multi-directional extension mechanism performs its extension action, the longitudinal extension member, the first transverse extension member, and the second transverse extension member have the same extension stroke, good synchronization, and consistent stroke.

[0027] In another implementation of this invention, the gear structure is configured as a first gear and a second gear that rotate coaxially and synchronously. The first rack structure meshes with the first gear, and the second rack structure and the third rack structure mesh with the second gear. This ensures simultaneity and is applicable to scenarios with different travel requirements in the lateral and longitudinal directions.

[0028] In this utility model, the longitudinal slide rail and the transverse slide rail can respectively ensure the smooth sliding of the longitudinal extension and the first transverse extension and the second transverse extension. The longitudinal guide groove cooperates with the first guide and the transverse guide groove cooperates with the second guide, which can play both the role of guiding and limiting. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of one embodiment of the multi-directional extension mechanism of this utility model;

[0030] Figure 2 for Figure 1 A schematic diagram after removing the upper part of the main installation structure;

[0031] Figure 3 for Figure 2 A structural diagram from another perspective;

[0032] Figure 4 for Figure 2 A plan view;

[0033] Figure 5 for Figure 4 Schematic diagram of the structure after longitudinal and lateral extension;

[0034] Figure 6 This is a schematic diagram showing the installation of the telescopic drive structure and gear structure on the mounting body.

[0035] Figure 7 This is a partial structural schematic diagram of another embodiment of the multi-directional extension mechanism of this utility model;

[0036] Figure 8 for Figure 7 A structural diagram from another perspective;

[0037] Figure 9 A schematic diagram of the structure when the multi-directional extension mechanism is configured in the leg rest;

[0038] Figure 10 for Figure 9 A structural diagram from another perspective;

[0039] Figure 11 for Figure 9 A schematic diagram of the structure after the middle leg support extends in multiple directions;

[0040] Figure 12 for Figure 11 A structural diagram from another perspective;

[0041] Figure 13 This is a schematic diagram of the structure of the six-way leg support of this utility model;

[0042] In the picture:

[0043] 1. Mounting body; 10. Gear structure; 11. First guide slide; 12. Second guide slide; 101. First gear; 102. Second gear;

[0044] 2. Longitudinal extension; 20. First rack structure; 21. Longitudinal slide rail; 22. Longitudinal guide groove;

[0045] 3. First lateral extension; 30. Second rack structure; 340. Lateral slide rail; 341. Lateral guide groove;

[0046] 4. Second lateral extension; 40. Third rack structure;

[0047] 5. Telescopic drive structure; 50. Sliding nut. Detailed Implementation

[0048] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0053] Example 1:

[0054] like Figures 1-6 As shown, a multi-directional extension mechanism in this embodiment mainly includes: a mounting body 1, a longitudinal extension member 2, a first transverse extension member 3, and a second transverse extension member 4. The mounting body 1 is provided with a telescopic drive structure 5 and a gear structure 10. The telescopic drive structure 5 drives the longitudinal extension member 2, the first transverse extension member 3, and the second transverse extension member 4 to telescopically extend and retract. The longitudinal extension member 2 is movably mounted on the mounting body 1. The longitudinal extension member 2 is provided with a first rack structure 20, which meshes with the gear structure 10. The first rack structure 20 drives the gear structure 10 to rotate, and the telescopic drive structure 5 drives the longitudinal extension member 2 to telescopically extend and retract longitudinally. Simultaneously, the first rack structure 20 causes the gear structure 10 to rotate. Both the first transverse extension member 3 and the second transverse extension member 4 are movably mounted. On the mounting body 1, the first lateral extension 3 is provided with a second rack structure 30, and the second lateral extension 4 is provided with a third rack structure 40. The second rack structure 30 and the third rack structure 40 respectively mesh with the gear structure 10. Through the rotation of the gear structure 10, the second rack structure 30 and the third rack structure 40 are driven to extend and retract. In actual use, when the telescopic drive structure 5 drives the longitudinal extension 2 to extend and retract, the longitudinal extension 2 drives the gear structure 10 to rotate through the first rack structure 20. The gear structure 10 meshes and transmits the second rack structure 30 and the third rack structure 40, so that the second rack structure 30 and the third rack structure 40 extend and retract, that is, the first lateral extension 3 and the second lateral extension 4 both extend and retract laterally at the same time.

[0055] In this embodiment, a gear structure 10 is provided on the mounting body 1, and a first rack structure 20, a second rack structure 30, and a third rack structure 40 are respectively provided on the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4. When the telescopic drive structure 5 drives the longitudinal extension 2 to move longitudinally, the first rack structure 20 on the longitudinal extension 2 drives the gear structure 10 to rotate, and the rotation of the gear structure 10 drives the first transverse extension 3 and the second transverse extension 4 to move laterally in sync, realizing simultaneous longitudinal and transverse extension, i.e., achieving multi-directional extension. The force on the first transverse extension 3 and the second transverse extension 4 remains unchanged during the transverse extension process, i.e., the movement stability of the first transverse extension 3 and the second transverse extension 4 is good, thus ensuring the overall movement stability of the multi-directional extension mechanism. Furthermore, the overall structure of the multi-directional extension mechanism is simple and occupies little space. Moreover, the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4 are driven by the same drive component, ensuring both synchronization and low cost.

[0056] The mounting body 1 provides structural support for other components and includes multiple brackets arranged front to back to facilitate the installation of other components. During extension, the mounting body 1 remains stationary. A longitudinal extension member 2 is movably and extendably mounted on the mounting body 1, effectively extending the longitudinal support range of the mounting body 1. The longitudinal extension member 2 allows for stepless adjustment of its longitudinal extension, thus improving the usability of the multi-directional extension mechanism. A first transverse extension member 3 is movably and extendably mounted on one side of the mounting body 1, effectively extending the support range on one transverse side of the mounting body 1. The first transverse extension member 3 is also steplessly adjustable. A second transverse extension member 4 is movably and extendably mounted on the other side of the mounting body 1 (opposite to the first transverse extension member 3), effectively extending the support range on the other transverse side of the mounting body 1 (opposite to the first transverse extension member 3). The second transverse extension member 4 is also steplessly adjustable.

[0057] The telescopic drive structure 5 primarily functions to drive the longitudinal extension member 2, the first transverse extension member 3, and the second transverse extension member 4 in the multi-directional extension mechanism to extend and retract. It drives these three members to extend and retract through its own telescopic movement. Therefore, the telescopic drive structure 5 can be implemented using various structures, such as telescopic cylinders, telescopic hydraulic cylinders, telescopic springs, and lead screw motors. Preferably, in this embodiment, the telescopic drive structure 5 is configured as a lead screw motor, and the output lead screw of the lead screw motor is equipped with a sliding nut 50 that can slide along it. The sliding nut 50 is fixedly connected to the longitudinal extension member 2. The lead screw of the lead screw motor is arranged longitudinally. When the lead screw of the lead screw motor rotates, it drives the sliding nut 50 to extend and retract along the lead screw (i.e., longitudinally), thereby driving the longitudinal extension member 2, which is fixedly connected to the sliding nut 50, to extend and retract.

[0058] In this embodiment, the second rack structure 30 and the third rack structure 40 are respectively disposed on opposite sides of the gear structure 10 and are rotationally symmetrical. Specifically, one of the second rack structure 30 and the third rack structure 40 is located on the upper side of the gear structure 10, and the other is located on the lower side of the gear structure 10. For example, the teeth of the second rack structure 30 protrude downwards, while the teeth of the third rack structure 40 protrude upwards, ensuring that when the gear structure 10 synchronously drives the second rack structure 30 and the third rack structure 40, the forces on the upper and lower sides are balanced, and the overall extension and retraction movement is smooth. The second rack structure 30 can be integrally formed with the first transverse extension 3, that is, the second rack structure 30 is part of the first transverse extension 3. Alternatively, the second rack structure 30 can be separately disposed from the first transverse extension 3 and fixed to the first transverse extension 3 by welding, riveting, or bolting. Similarly, the third rack structure 40 can be integrated with the second transverse extension 4, that is, the third rack structure 40 is part of the second transverse extension 4 and is integrally formed. Of course, the third rack structure 40 can also be separately set from the second transverse extension 4 and fixed to the second transverse extension 4 by welding, riveting or bolting.

[0059] In this embodiment, the second rack structure 30 and the third rack structure 40 are arranged in parallel, both along the transverse direction. The extension and retraction directions of the second rack structure 30 and the third rack structure 40 are the extension and retraction directions of the first transverse extension member 3 and the second transverse extension member 4, i.e., transverse. Therefore, the arrangement direction of the second rack structure 30 and the third rack structure 40 is perpendicular to the first rack structure 20, thereby making the transverse extension and retraction directions of the first transverse extension member 3 and the second transverse extension member 4 perpendicular to the extension and retraction direction of the longitudinal extension member 2. For example, when the multi-directional extension mechanism of this embodiment is applied to a leg rest, the left and right transverse extension directions of the leg rest are perpendicular to the downward longitudinal extension direction of the leg rest.

[0060] To improve the telescopic movement effect of the first lateral extension 3 and the second lateral extension 4, this embodiment provides lateral slide rails 340 between the first lateral extension 3 and the mounting body 1, and between the second lateral extension 4 and the mounting body 1. The lateral slide rail 340 includes an upper rail and a lower rail, with the upper rail slidably mounted on the lower rail. The lower rail is fixedly connected to the mounting body 1, and the upper rail is fixedly connected to either the first lateral extension 3 or the second lateral extension 4. Therefore, when the upper rail of the lateral slide rail 340 slides along the lower rail, the first lateral extension 3 or the second lateral extension 4 slides laterally relative to the mounting body 1.

[0061] To improve the telescopic movement effect of the longitudinal extension member 2, this embodiment provides a longitudinal slide rail 21 between the longitudinal extension member 2 and the mounting body 1. The longitudinal slide rail 21 includes an upper rail and a lower rail. The upper rail is slidably mounted on the lower rail, and the lower rail is fixedly connected to the mounting body 1. The upper rail is fixedly connected to the longitudinal extension member 2. Therefore, when the upper rail of the longitudinal slide rail 21 slides along the lower rail, the longitudinal extension member 2 slides longitudinally relative to the mounting body 1. Since the longitudinal extension member 2 is relatively wide, a longitudinal slide rail 21 is provided on each of its two sides to ensure smooth movement of the longitudinal extension member 2 and prevent unilateral deviation.

[0062] Furthermore, the longitudinal extension member 2 is provided with a longitudinal guide groove 22 along its own extension direction (i.e., longitudinal direction), and the first transverse extension member 3 and the second transverse extension member 4 are provided with transverse guide grooves 341 along their own extension direction (i.e., transverse direction). The longitudinal guide groove 22 is a waist groove arranged longitudinally, and the transverse guide groove 341 is a waist groove arranged transversely. The mounting body 1 is provided with a first guide member 11 and a second guide member 12 respectively. The outer surfaces of the first guide member 11 and the second guide member 12 are cylindrical to ensure that they cooperate with the sides of the guide groove. Among them, the first guide member 11 is disposed in the longitudinal guide groove 22. When the longitudinal extension member 2 moves longitudinally, the first guide member 11 and the longitudinal guide groove 22 guide the slide and can limit the extreme position of the extension movement of the longitudinal extension member 2. The second guide slide 12 is disposed in the transverse guide slide groove 341. When the first transverse extension 3 and the second transverse extension 4 move laterally relative to the mounting body 1, the second guide slide 12 and the transverse guide slide groove 341 guide the slide and can limit the extreme positions of the transverse extension movement of the first transverse extension 3 and the second transverse extension 4.

[0063] In actual use, the longitudinal slide rail 21 and the transverse slide rail 340 can ensure the smooth sliding of the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4, respectively. The longitudinal guide groove 22, in conjunction with the first guide 11, and the transverse guide groove 341, in conjunction with the second guide 12, can both guide the sliding and limit the movement.

[0064] Specifically, in this embodiment, the gear structure 10 is configured as a single gear, and the first rack structure 20, the second rack structure 30 and the third rack structure 40 mesh with the single gear. The longitudinal extension 2, the first transverse extension 3 and the second transverse extension 4 move synchronously and have equal extension and retraction strokes. To explain, gear structure 10 is a single gear, and the first rack structure 20, the second rack structure 30, and the third rack structure 40 all mesh with this single gear. During operation, the first rack structure 20 meshes with and drives the single gear, so the longitudinal extension speed of the first rack structure 20 is equal to the rotational linear velocity of the single gear. The second rack structure 30 and the third rack structure 40 also directly mesh with the single gear, and their lateral extension speeds are also equal to the rotational linear velocity of the single gear. Therefore, the first rack structure 20, the second rack structure 30, and the third rack structure 40 not only move synchronously, but also have equal extension strokes. That is, the longitudinal extension 2, the first lateral extension 3, and the second lateral extension 4 move synchronously and have equal strokes. For example, when the multi-directional extension mechanism of this embodiment is applied to a leg rest, the longitudinal extension 2, the first lateral extension 3, and the second lateral extension 4 can all extend outward by 50 mm to ensure sufficient support for the passenger's legs.

[0065] In actual use, in the implementation of this embodiment, the gear structure 10 is configured as a single gear. The single gear meshes with the first rack structure 20, the second rack structure 30 and the third rack structure 40 simultaneously, ensuring that when the multi-directional extension mechanism performs the extension action, the longitudinal extension member 2, the first transverse extension member 3 and the second transverse extension member 4 have the same extension stroke, good synchronization and consistent stroke.

[0066] Combination Figure 4 and Figure 5 As shown, the working principle of the multi-directional extension mechanism in this embodiment is as follows:

[0067] When the multi-directional extension mechanism is not deployed (i.e. not extended), the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4 are all retracted onto the mounting body 1. When the multi-directional extension mechanism needs to be deployed, the telescopic drive structure 5, configured as a lead screw motor, operates. The output lead screw of the lead screw motor rotates, driving the sliding nut 50 to move from top to bottom along the output lead screw. The sliding nut 50 drives the longitudinal extension member 2, which is fixedly connected to it, to slide from top to bottom. The first rack structure 20 on the longitudinal extension member 2 meshes with the gear structure 10, causing the gear structure 10 to rotate. The gear structure 10 simultaneously meshes with the second rack structure 30 and the third rack structure 40, causing the second rack structure 30 to extend laterally to the left and the third rack structure 40 to extend laterally to the right. This means that the second rack structure 30 and the third rack structure 40 extend laterally outward synchronously, that is, the first lateral extension member 3 and the second lateral extension member 4 extend laterally outward respectively. When the extension limit position is reached, the lead screw motor stops working, and the longitudinal extension member 2, the first lateral extension member 3, and the second lateral extension member 4 extend to the maximum stroke, and the multi-directional extension mechanism is fully deployed.

[0068] Conversely, when the multi-directional extension mechanism needs to be retracted from its extended state, the lead screw motor drives the output lead screw to rotate in the opposite direction, causing the sliding nut 50 to move from bottom to top along the output lead screw. The sliding nut 50 drives the longitudinal extension member 2, which is fixedly connected to it, to slide from bottom to top. The first rack structure 20 on the longitudinal extension member 2 meshes with the gear structure 10, causing the gear structure 10 to rotate (the rotation direction of the gear structure 10 at this time is opposite to the direction of extension of the multi-directional extension mechanism). The gear structure 10 simultaneously meshes with the second rack structure 30 and the third rack structure 40, causing the second rack structure 30 to extend laterally to the right and the third rack structure 40 to extend laterally to the left. This causes the second rack structure 30 and the third rack structure 40 to retract inward in lateral direction simultaneously, that is, the first lateral extension member 3 and the second lateral extension member 4 retract inward in lateral direction until they are fully retracted, at which point the lead screw motor stops working.

[0069] Example 2:

[0070] like Figures 7-8 And refer to the first embodiment. Figures 1-6 As shown, the difference between this embodiment and embodiment one is that the gear structure 10 in this embodiment is no longer configured as a single gear, but is configured as two coaxial gears that rotate synchronously. One of the two gears is a large gear and the other is a small gear. It can be understood that the gear structure 10 is configured as a gear shaft.

[0071] Specifically, the gear structure 10 is configured as a first gear 101 and a second gear 102 that are coaxially arranged and rotate synchronously. The first rack structure 20 meshes with the first gear 101, and the second rack structure 30 and the third rack structure 40 mesh with the second gear 102, respectively. The pitch circle diameter and the number of teeth of the first gear 101 and the second gear 102 are different, so that the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4 can move simultaneously in extension and retraction, and the extension and retraction stroke of the longitudinal extension 2 is not equal to the extension and retraction stroke of the first transverse extension 3 and the second transverse extension 4. More specifically, the pitch circle diameter and number of teeth of the first gear 101 are larger than those of the second gear 102. That is, the first gear 101 is a large gear and the second gear 102 is a small gear. Therefore, after transmission through the large gear and the small gear, it is equivalent to a first-stage reduction. This makes it possible that in actual use, the extension stroke of the first lateral extension 3 and the second lateral extension 4 is less than the extension stroke of the longitudinal extension 2 in the same amount of time.

[0072] refer to Figure 7 and Figure 8 As shown, the working principle of the multi-directional extension mechanism in this embodiment is as follows:

[0073] When the multi-directional extension mechanism is in the retracted state, and needs to be extended for use, the output screw of the screw motor rotates, driving the sliding nut 50 to move from top to bottom along the output screw. The sliding nut 50 drives the longitudinal extension member 2, which is fixedly connected to it, to slide from top to bottom. The first rack structure 20 on the longitudinal extension member 2 meshes with the first gear 101 (i.e., the large gear), causing the first gear 101 and the second gear 102 to rotate simultaneously. The second gear 102 (i.e., the small gear) simultaneously meshes with the second rack structure 30 and the third rack structure 40, causing the second rack structure 30 to extend laterally to the left, and the third rack structure 40 to extend laterally to the left. The structure 40 extends laterally to the right, causing the second rack structure 30 and the third rack structure 40 to extend outward synchronously in the lateral direction. That is, the first lateral extension member 3 and the second lateral extension member 4 extend outward laterally respectively. When they reach their extension limit positions, the lead screw motor stops working, and the longitudinal extension member 2, the first lateral extension member 3, and the second lateral extension member 4 extend to their maximum stroke, fully deploying the multi-directional extension mechanism. The extension strokes of the first lateral extension member 2 and the second lateral extension member 4 are equal, and the extension stroke of the longitudinal extension member 2 is greater than that of the first lateral extension member 2 and the second lateral extension member 4. For example, the stroke of the longitudinal extension member 2 can be set to 70 mm, while the extension strokes of the first lateral extension member 2 and the second lateral extension member 4 are both 50 mm. This multi-directional extension mechanism is applicable to scenarios where the longitudinal extension distance is required to be greater than the lateral extension distance.

[0074] Conversely, when the multi-directional extension mechanism of this embodiment needs to be retracted from the fully extended state, the lead screw motor drives the output lead screw to rotate in the opposite direction, driving the sliding nut 50 to move from bottom to top along the output lead screw. The sliding nut 50 drives the longitudinal extension member 2, which is fixedly connected to it, to slide from bottom to top. The first rack structure 20 on the longitudinal extension member 2 meshes with the first gear 101 (i.e., the large gear), so that the first gear 101 and the second gear 102 rotate synchronously (the rotation direction of the first gear 101 and the second gear 102 at this time is opposite to the direction of extension of the multi-directional extension mechanism). The second gear 102 (i.e., the small gear) simultaneously meshes with the second rack structure 30 and the third rack structure 40, so that the second rack structure 30 extends laterally to the right and the third rack structure 40 extends laterally to the left, so that the second rack structure 30 and the third rack structure 40 retract inward synchronously along the lateral direction, that is, the first lateral extension member 3 and the second lateral extension member 4 retract inward laterally until they are fully retracted, and the lead screw motor stops working. Similarly, the retraction strokes of the first lateral extension and the second lateral extension 4 are equal, and the retraction stroke of the longitudinal extension 2 is greater than that of the first lateral extension and the second lateral extension 4.

[0075] In practical use, in the embodiments of this example, the gear structure 10 is configured as a first gear 101 and a second gear 102 that rotate coaxially and synchronously. The first rack structure 20 meshes with the first gear 101, and the second rack structure 30 and the third rack structure 40 mesh with the second gear 102. While ensuring simultaneity, it can be applied to scenarios with different travel requirements in the lateral and longitudinal directions.

[0076] Optionally, the gear structure 10 can be configured as three gears arranged coaxially and rotating synchronously. The three gears are respectively set as a large gear, a medium gear, and a small gear according to the pitch circle diameter and the number of teeth. Among the large gear, medium gear, and small gear, one meshes with the first rack structure 20, one meshes with the second rack structure 30, and one meshes with the third rack structure 40. In actual use, the extension speed of the first rack structure 20, the second rack structure 30, and the third rack structure 40 are different, and the extension stroke in the same amount of time is different. That is, the extension speed of the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4 are different, and the extension stroke in the same amount of time is different. This can ensure that the longitudinal extension 2, the first transverse extension 3, and the second transverse extension 4 can extend and retract simultaneously, and also ensure that the extension and retraction strokes are different.

[0077] Example 3:

[0078] like Figures 9-12As shown, this embodiment proposes a leg rest, which is equipped with the multi-directional extension mechanism described in Embodiment 1 or Embodiment 2, allowing the leg rest to extend simultaneously in the longitudinal and lateral directions. Corresponding frames and comfort components (such as foam) can be added to the longitudinal extension 2, the first lateral extension 3, and the second extension 4 to ensure passenger comfort when their legs rest against the longitudinal extension 2, the first lateral extension 3, or the second lateral extension 4. Specifically:

[0079] When the leg support in this embodiment is configured with the multi-directional extension mechanism as in Embodiment 1, the longitudinal and lateral extensions of the leg support are completely synchronized, and the extension strokes are equal.

[0080] When the leg support in this embodiment is configured with the multi-directional extension mechanism of Embodiment 2, the lateral extension and longitudinal extension of the leg support occur simultaneously, and the stroke of the longitudinal extension is greater than the stroke of the lateral extension.

[0081] Preferably, such as Figure 13 As shown, the leg support in this embodiment can be configured as a six-way leg support. A six-bar linkage mechanism (an existing structure) is driven by a lead screw to rotate the leg support, and the multi-directional extension mechanism of Embodiment 1 or Embodiment 2 drives the leg support to extend longitudinally and laterally. That is, the leg support achieves six-way adjustment of rotation, lateral extension, and longitudinal extension.

[0082] In this embodiment, the leg rest utilizes the multi-directional extension mechanism of Embodiment 1 or Embodiment 2. This mechanism increases the Y-axis width (i.e., lateral width) while maintaining the original vehicle body dimensions, providing better support; for example, the width on one side can be increased by 50 mm. It does not require an additional motor; instead, it utilizes the existing length extension motor to simultaneously achieve extension in both the X and Y directions. Compared to existing linkage mechanisms, the multi-directional extension mechanism requires less space and offers better stability.

[0083] Example 4:

[0084] A car seat is provided, wherein a headrest and / or a table are configured on the car seat, and the headrest and / or the table are configured with a multi-directional extension mechanism as described in Embodiment 1 or Embodiment 2. That is, the multi-directional extension mechanism in Embodiment 1 and Embodiment 2 can also be applied to the small table of the car seat, as well as the adjustable headrest.

[0085] In summary, the multi-directional extension mechanism in this solution exhibits good motion stability, occupies little space, and has a simple structure and low cost.

Claims

1. A multi-directional extension mechanism, characterized in that, include: The mounting body is equipped with a telescopic drive structure and a gear structure; A longitudinal extension is movably mounted on the mounting body. The longitudinal extension has a first rack structure, and the first rack structure meshes with the gear structure. The telescopic drive structure can drive the longitudinal extension to move longitudinally, while the first rack structure causes the gear structure to rotate. A first lateral extension and a second lateral extension are movably mounted on the mounting body. The first lateral extension is provided with a second rack structure, and the second lateral extension is provided with a third rack structure. The second rack structure and the third rack structure respectively mesh with the gear structure. When the longitudinal extension extends and retracts longitudinally, and drives the gear structure to rotate through the first rack structure, the gear structure meshes with the second rack structure and the third rack structure, causing both the first transverse extension and the second transverse extension to move laterally simultaneously.

2. The multi-directional extension mechanism according to claim 1, characterized in that, The second rack structure and the third rack structure are respectively disposed on opposite sides of the gear structure and are arranged in a rotationally symmetrical manner.

3. The multi-directional extension mechanism according to claim 1, characterized in that, The second rack structure and the third rack structure are arranged in parallel and are both perpendicular to the first rack structure; The lateral extension and retraction directions of the first and second lateral extensions are perpendicular to the retraction and retraction directions of the longitudinal extension.

4. The multi-directional extension mechanism according to claim 1, characterized in that, A transverse slide rail is provided between the first transverse extension member and the mounting body, and between the second transverse extension member and the mounting body; A longitudinal slide rail is provided between the longitudinal extension and the mounting body.

5. The multi-directional extension mechanism according to claim 1, characterized in that, The longitudinal extension is provided with a longitudinal guide groove along its own extension and contraction direction, and the first transverse extension and the second transverse extension are provided with transverse guide grooves along their own extension and contraction directions. The mounting body is provided with a first guide slide and a second guide slide, the first guide slide is disposed in the longitudinal guide slide groove, and the second guide slide is disposed in the transverse guide slide groove.

6. The multi-directional extension mechanism according to claim 1, characterized in that, The telescopic drive structure is configured as a lead screw motor, and the output lead screw of the lead screw motor is provided with a sliding nut that can slide along it, and the sliding nut is fixedly connected to the longitudinal extension member.

7. The multi-directional extension mechanism according to claim 1, characterized in that, The gear structure is configured as a single gear, with the first rack structure, the second rack structure, and the third rack structure meshing with the single gear. The longitudinal extension, the first transverse extension, and the second transverse extension move synchronously and have equal extension strokes.

8. The multi-directional extension mechanism according to claim 1, characterized in that, The gear structure is configured as a first gear and a second gear that are coaxially arranged and rotate synchronously, the first rack structure meshes with the first gear, and the second rack structure and the third rack structure mesh with the second gear respectively; The pitch circle diameter and number of teeth of the first gear and the second gear are different, so that the longitudinal extension, the first transverse extension and the second transverse extension can move simultaneously, and the extension stroke of the longitudinal extension is not equal to the extension stroke of the first transverse extension and the second transverse extension.

9. A leg rest, characterized in that, The leg rest is provided with a multi-directional extension mechanism as described in any one of claims 1-8, so that the leg rest can extend both longitudinally and laterally at the same time.

10. A car seat, characterized in that, The car seat is equipped with a headrest and / or a table, and the headrest and / or the table is equipped with a multi-directional extension mechanism as described in any one of claims 1-8.

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