Leg rest structure and four-way leg rest

Abstract

The application belongs to the field of automobile parts, and provides a leg support structure and a four-way leg support, which comprises a leg support framework, an extension framework, a guide arm and a support arm, wherein: the extension framework is slidably arranged on the leg support framework to perform extension and contraction movement relative to the leg support framework; one end of the guide arm is movably connected to the leg support framework, and the other end is movably connected to the support arm. Compared with the prior art, the application has the advantages that through the guiding effect of the guide arm, the support arm is positively rotated to form stable support below the extension framework when the extension framework is extended in cooperation, effectively solving the problem of insufficient bearing capacity or easy deformation of the traditional leg support after being extended, significantly improving the structural stability and bearing safety of the leg support in the unfolded state; at the same time, the automatic hiding of the guide arm and the automatic contraction of the support arm are realized when the extension framework is retracted, depending on the structural design of the guide hole, greatly saving the storage space, and also improving the overall appearance.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts, specifically relating to a leg support structure and a four-way leg support. Background Technology

[0002] Car seats are equipped with leg rests, which can be adjusted according to the passenger's sitting or lying posture to support the passenger's legs and effectively improve passenger comfort.

[0003] As users demand higher comfort levels for car seats, the most common type of leg rest on the market is the four-way leg rest. During use, the leg rest can not only be adjusted forward and backward, but also rotated up and down, which can accommodate passengers of different heights and body types, as well as different sitting and lying positions.

[0004] Traditional leg support structures typically consist of a leg support frame and an extension frame that slides relative to it. However, when the extension frame extends to support the user's lower leg, the lack of effective bottom support for the extension frame in existing leg support structures causes the extension section to form a cantilever beam structure. This makes it highly susceptible to sagging, swaying, or even breakage under the weight of the user, severely affecting the overall rigidity and stability of the leg support structure during use. Furthermore, in some car seats with limited space, even greater demands are placed on the space occupied by the support structure when folded. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a leg support structure and a four-way leg support that is simple in structure, has good stability, improves structural rigidity, and reduces space occupation.

[0006] The objective of this invention can be achieved by addressing the following technical problem: a leg support structure is proposed, comprising a leg support frame, an extension frame, a guide arm, and a support arm, wherein: The extension frame is slidably mounted on the leg support frame to extend and retract relative to the leg support frame; One end of the guide arm is movably connected to the leg support frame, and the other end is movably connected to the support arm. The connection between the guide arm and the support arm is movably hinged to the extension frame to guide the support arm to switch between the retracted position and the extended position of the leg support frame. When the extension frame performs an extension movement, the guide arm is used to guide the support arm to rotate in the forward direction relative to the leg support frame to below the extension frame, so that the support arm provides support to the extension frame in the extended position. When the extended frame performs a retraction movement, the guide arm guides the support arm to rotate in the opposite direction to the retracted position, so that the guide arm and the support arm retract together to the underside of the leg support frame.

[0007] In one of the leg support structures described above, a drive arm is movably connected to the extended frame, and the connection between the guide arm and the support arm is movably hinged to the end of the drive arm.

[0008] In one of the above-mentioned leg support structures, a fixed bracket is installed on the leg support frame, and a guide hole is provided on the fixed bracket parallel to the moving direction of the extended frame. The end of the guide arm away from the drive arm is movably engaged in the guide hole by a connecting pin.

[0009] In one of the above-mentioned leg support structures, the drive arm has a waist-shaped hole, the guide arm and the support arm are hinged together by a connecting shaft, and the connecting shaft is movably engaged in the waist-shaped hole.

[0010] In one of the leg support structures described above, the support arm includes a rotating rod and a support rod that are integrally formed at an angle. The end of the rotating rod away from the support rod is movably hinged to the drive arm via the connecting shaft, and the end of the support rod away from the rotating rod is used to contact the ground.

[0011] In the aforementioned leg support structure, the two ends of the connecting shaft are respectively provided with anti-detachment blocks and mounting grooves. The anti-detachment blocks are movably attached to the outer wall of the waist-shaped hole, and the mounting groove is provided with a limiting block. The limiting block abuts against the rotating rod to restrict the connecting shaft from disengaging from the waist-shaped hole.

[0012] In one of the leg support structures described above, a reinforcing plate is connected between two adjacent support rods.

[0013] In one of the leg support structures described above, the extended frame is further provided with a bearing frame and a support frame, and the end of the drive arm away from the guide arm is movably hinged to the bearing frame; the bends of the rotating rod and the support rod are movably hinged to the support frame.

[0014] In one of the leg support structures described above, the length of the rotating rod is less than the length of the support rod.

[0015] The technical solution adopted by the present invention to solve its technical problem is to also propose a four-way leg support, including one of the leg support structures mentioned above.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The leg support structure and four-way leg support of the present invention, through the guiding action of the guide arm, and in conjunction with the extension frame extending, the linkage support arm rotates forward to the bottom of the extension frame to form a stable support, effectively solving the problem that the traditional leg support is suspended after extension, resulting in insufficient load-bearing capacity or easy deformation, and significantly improving the structural stability and load-bearing safety of the leg support in the unfolded state; at the same time, relying on the structural design of the guide hole, the guide arm can be automatically hidden and the support arm can be automatically retracted when the extension frame is retracted, which greatly saves storage space and also improves the overall aesthetics.

[0018] (2) The lever principle is used to optimize the lever arm ratio of the support arm. The shorter rotating rod is used as the power input end and the longer support rod is used as the output end. This can achieve a larger support expansion range and a lower grounding angle within a limited extension stroke, thereby providing a longer support span and a more stable support posture.

[0019] (3) The waist-shaped hole provides a certain floating stroke and adjustment space for the connecting shaft, avoiding jamming when the guide arm and support arm move relative to each other, thus ensuring the smoothness and stability of the support arm when switching between the retracted and extended positions. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the support arm in the extended position; Figure 2 This is a schematic diagram of the structure when the support arm is in the retracted position; Figure 3 This is a structural diagram of the guide arm, support arm, and drive arm; Figure 4 yes Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the structure used to drive the extension frame to extend and retract relative to the leg support frame.

[0021] In the diagram, 1 is the leg support frame; 10 is the fixing bracket; 100 is the guide hole; and 11 is the lead screw bracket. 2. Extension frame; 20. Drive arm; 200. Waist-shaped hole; 21. Connecting shaft; 210. Anti-detachment block; 211. Mounting slot; 212. Washer; 22. Bearing frame; 23. Support frame; 3. Guide arm; 30. Connecting pin; 4. Support arm; 40. Rotating rod; 41. Support rod; 410. Reinforcing plate; 50. Drive motor; 51. Lead screw. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention 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 indication will also change accordingly.

[0024] like Figures 1 to 5 As shown, a leg support structure is characterized by comprising a leg support frame 1, an extension frame 2, a guide arm 3, and a support arm 4.

[0025] Wherein: the extension frame 2 is slidably mounted on the leg support frame 1 to extend and retract relative to the leg support frame 1; one end of the guide arm 3 is movably connected to the leg support frame 1, and the other end is movably connected to the support arm 4, and the connection between the guide arm 3 and the support arm 4 is movably hinged to the extension frame 2 to guide the support arm 4 to switch between the retracted position and the extended position of the leg support frame 1; when the extension frame 2 performs the extension movement, the guide arm 3 is used to guide the support arm 4 to rotate forward relative to the leg support frame 1 to the underside of the extension frame 2, so that the support arm 4 forms support for the extension frame 2 in the extended position; when the extension frame 2 performs the retraction movement, the guide arm 3 is used to guide the support arm 4 to rotate in the opposite direction to the retracted position, so that the guide arm 3 and the support arm 4 retract together to the underside of the leg support frame 1.

[0026] This design primarily aims to achieve the coordinated operation of the support arm 4 and the extension frame 2, thereby providing both storage and support. Specifically, when the extension frame 2 extends outward relative to the leg support frame 1, the extension frame 2 moves along... Figure 2 Moving to the right generates horizontal displacement. Since one end of the guide arm 3 is movably connected to the leg support frame 1, and the other end is hinged to the support arm 4 and the extension frame 2, as the extension frame 2 moves outward, the hinge point on the extension frame 2 is forced to move outward, thereby pulling the guide arm 3 to deflect at an angle. The deflection motion of the guide arm 3, through its connection with the support arm 4, applies an upward torque to the support arm 4. Under the action of this torque, the support arm 4 rotates in the positive direction relative to the leg support frame 1 (i.e., the support arm 4 rotates along...). Figure 2 Rotate counterclockwise to Figure 1 (as shown in the image), until the extended skeleton 2 reaches... Figure 1 As shown in the extended position, the support arm 4 rotates synchronously to below the extension frame 2. During use, the weight of the user's legs is directly transferred to the support arm 4 through the extension frame 2, ultimately forming a stable support for the extended frame 2 after it extends. Similarly, when the extension frame 2 is positioned relative to the leg support frame 1... Figure 1 The expanded position shown is retracted to Figure 2 When the extended frame 2 is in the contracted position, the inward movement of the extended frame 2 causes the connection point of the guide arm 3, which is hinged to it, to return inward. During the return process, the angle of the guide arm 3 changes, thereby applying an angle along the support arm 4. Figure 1 The clockwise rotational torque decreases as the support arm 4 rotates in the opposite direction relative to the leg support frame 1 (i.e., the support arm 4 rotates along the clockwise direction). Figure 1 Rotate clockwise to Figure 2 As shown in the diagram, the support arm 4 gradually moves away from the support position. During the process of the extension frame 2 retracting above the leg support frame 1, the support arm 4 also moves synchronously towards the bottom of the leg support frame 1. It is worth noting that the angle of the guide arm 3 can change relative to the leg support frame 1 as the extension frame 2 moves. Simultaneously, when the extension frame 2 is in... Figure 2 In the position shown, the guide arm 3 overlaps with the bottom structure of the leg support frame 1. With the retraction of the support arm 4, it effectively saves space. Figure 2 The thickness of the extended frame 2, leg support frame 1, guide arm 3, and support arm 4, all in their retracted state, is shown, thus reducing the space occupied by the leg support structure and facilitating storage and transportation. It is evident that this solution, through the telescopic movement of the extended frame 2 relative to the leg support frame 1, combined with the guiding action of the guide arm 3, constructs a mechanical structure in which the support arm 4 extends and retracts in tandem, effectively solving the problem of insufficient load-bearing capacity or easy deformation caused by the traditional leg support being suspended after extension. This significantly improves the structural stability and load-bearing safety of the leg support in its extended state. Simultaneously, when the extended frame 2 retracts, the guide arm 3 automatically guides the support arm 4 to rotate in the opposite direction and retract under the leg support frame 1, achieving automatic concealment of the guide arm 3 and retraction of the support arm 4 (i.e., a stacked storage between the guide arm 3 and the support arm 4), greatly saving storage space and making it suitable for space-constrained car seats.

[0027] A drive arm 20 is movably connected to the extended frame 2, and the connection between the guide arm 3 and the support arm 4 is movably hinged to the end of the drive arm 20.

[0028] like Figures 1 to 3As shown, this embodiment introduces a drive arm 20 as an intermediate transmission medium. The drive arm 20 acts as a lever, which can more effectively convert the linear driving force of the extension frame 2 into the rotational torque of the support arm 4. Especially in the extended position, the drive arm 20, guide arm 3 and support arm 4 can form a more stable triangular support system. Therefore, when heavy pressure is applied to the user's legs, the load is transmitted to the drive arm 20 through the extension frame 2 and finally applied to the support arm 4, thereby improving the overall rigidity and deformation resistance of the leg support structure. Even when used by a heavy user, it can remain stable and not shake. This structure not only optimizes the force transmission path, but also makes the linear extension and retraction motion of the extension frame 2 more smoothly and accurately converted into the rotational motion of the support arm 4, enhancing the synchronization and reliability of the mechanism's motion and reducing the phenomenon of jamming or interference during the motion process.

[0029] The drive arm 20 has a waist-shaped hole 200. The guide arm 3 and the support arm 4 are hinged together by a connecting shaft 21, and the connecting shaft 21 is movably engaged in the waist-shaped hole 200.

[0030] like Figure 3 As shown, in this embodiment, a waist-shaped hole 200 is opened in the length direction of the drive arm 20, and the connecting shaft 21 is movably engaged in it. The waist-shaped hole 200, as an elongated hole structure, provides a certain floating stroke and adjustment space for the connecting shaft 21. When the extension frame 2 performs telescopic movement, the sliding of the connecting shaft 21 in the hole is equivalent to a "buffering and yielding" mechanism. Then, the movement of the connecting shaft 21 (i.e., the movable hinge of the support arm 4 and the guide arm 3) realizes the switching of the support arm 4 between the retracted position and the extended position. This avoids the jamming phenomenon when the guide arm 3 and the support arm 4 move relative to each other. At the same time, there is no need to sacrifice internal space or increase external dimensions to avoid the jamming. Therefore, this embedded sliding connection not only saves the connection space of the drive arm 20, the guide arm 3 and the support arm 4, but also improves the smoothness and stability of the support arm 4 when switching between the retracted position and the extended position.

[0031] The support arm 4 includes a rotating rod 40 and a support rod 41 that are angled together and integrally formed. The end of the rotating rod 40 away from the support rod 41 is movably hinged to the drive arm 20 via a connecting shaft 21. The end of the support rod 41 away from the rotating rod 40 is used to contact the ground.

[0032] like Figure 3As shown, in this embodiment, the support arm 4 is designed as an integrally formed rotating rod 40 and support rod 41, with the two arranged at an angle. In traditional straight rod structures, the supporting force is often accompanied by a large bending moment. However, this solution eliminates the risk of loosening between the assembled parts through the integrally formed structure, which greatly improves the overall rigidity and strength of the support arm 4. At the same time, the angle arrangement allows the support rod 41 to contact the ground at a more optimal angle when it is deployed, forming a stable triangular support structure and maximizing the torque balance effect. In addition, this integrated design simplifies the manufacturing process, reduces the number of parts and assembly costs, and reduces potential failure points.

[0033] Preferably, in this embodiment, the length of the rotating rod 40 is much smaller than the length of the support rod 41, such as... Figure 3 As shown, the lever principle is used to optimize the lever arm ratio. The shorter rotating rod 40 serves as the power input end, while the longer support rod 41 serves as the output end. This allows a small-angle rotation of the rotating rod 40 to drive the end of the support rod 41 to complete a large range of displacement. This enables the support arm 4 to quickly land and provide support when the extended frame 2 is deployed, giving the user a sense of "instant stability" and security. Moreover, this structure can achieve a greater support deployment range and grounding angle within a limited extension stroke, thus providing a longer support span and a more stable support posture. In addition, the short rotating rod 40 design facilitates more compact storage under the frame in the retracted state, further optimizing the minimum storage volume.

[0034] The two ends of the connecting shaft 21 are respectively provided with anti-detachment block 210 and mounting groove 211. The anti-detachment block 210 is movably attached to the outer wall of the waist-shaped hole 200. The mounting groove 211 is provided with a limiting block, which abuts against the rotating rod 40 to restrict the connecting shaft 21 from detaching from the waist-shaped hole 200.

[0035] like Figure 3 and Figure 4As shown, regarding the connection between the guide arm 3 and the rotating rod 40, this embodiment utilizes a connecting shaft 21 passing through the oblong hole 200, the guide arm 3, and the rotating rod 40. With the anti-detachment block 210 abutting against the outer wall of the oblong hole 200, the worker can then assemble it into the mounting groove 211 using a limiting block (not shown in the figure, similar to a snap ring structure in the prior art, and will not be described in detail here). It is worth noting that the anti-detachment block 210 and the limiting block in the mounting groove 211 form a double limiting structure, physically blocking the path of the connecting shaft 21 from leaving the oblong hole 200 along its axial direction, completely solving the safety hazard of easy shaft detachment in the frequent reciprocating motion of existing hinge structures. This design significantly improves the safety and reliability of the leg support structure in long-term use, achieving self-locking fixation without the need for additional fasteners, resulting in low maintenance costs. Preferably, this embodiment can also add a washer 212 between the limiting block and the rotating rod 40. This washer 212 eliminates manufacturing and assembly errors during assembly, and also reduces wear caused by frequent rotation of the rotating rod.

[0036] Preferably, since the support arms 4 in this solution are symmetrically arranged in two sets, a reinforcing plate 410 is added between two adjacent support rods 41 in this embodiment. The design of the reinforcing plate 410 significantly improves the lateral rigidity and torsional resistance of the leg support mechanism, prevents the support arm 4 from deforming or tilting under unilateral force or off-center load, strengthens the synchronicity of movement of the left and right support rods 41, ensures the uniform distribution of support force, thereby further extending the service life of the leg support structure and ensuring the reliability of long-term use.

[0037] A fixed bracket 10 is installed on the leg support frame 1. The fixed bracket 10 has a guide hole 100 that is parallel to the moving direction of the extension frame 2. The end of the guide arm 3 away from the drive arm 20 is movably engaged in the guide hole 100 by a connecting pin.

[0038] like Figures 1 to 3 As shown, in this embodiment, a fixed bracket 10 with a guide hole 100 is provided on the leg support frame 1, and the end of the guide arm 3 is engaged in the guide hole 100 by a connecting pin. The guide hole 100 forms a bidirectional constraint on the connecting pin (sliding along the length of the hole and locking perpendicular to the length of the hole), thereby strictly constraining the movement trajectory of the guide arm 3 and ensuring that the guide arm 3 always moves in a predetermined direction during the movement of the extension frame 2. It should be noted that the guide hole 100 structure is only for... Figure 3 The running trajectory of the left end of the guide arm 3 is constrained to accommodate the rotation of the drive arm 20 and the support arm 4. Figure 3The right end of the guide arm 3 shown is movably engaged in the waist-shaped hole 200 only through the connecting shaft 21. This floating constraint makes the movement of the entire mechanism smoother, effectively avoiding mechanical jamming, abnormal noise or wear caused by trajectory deviation, and extending service life. Therefore, while ensuring the smooth expansion and contraction of the support arm 4, the overall space occupied after contraction can be reduced by relying on the engagement between the guide hole 100 and the guide arm 3.

[0039] The extended frame 2 is also equipped with a bearing frame 22 and a support frame 23. The end of the drive arm 20 away from the guide arm 3 is movably hinged to the bearing frame 22; the bends of the rotating rod 40 and the support rod 41 are movably hinged to the support frame 23.

[0040] like Figures 1 to 3 As shown, it should be noted that both the support frame 22 and the support frame 23 can be integrally formed with the extension frame 2 or assembled in a detachable manner (using screws, bolts, etc.). In this embodiment, the drive arm 20 and the support arm 4 are not directly assembled onto the body of the extension frame 2 (considering that direct connection often leads to the support arm 4 colliding or rubbing against the extension frame 2 in the initial stage of folding). Instead, the connection rigidity and shear resistance are improved through the support frame 22 and the support frame 23, respectively. The support frame 22 / support frame 23 is usually made of thickened plate, casting, or reinforcing rib structure, and its thickness and strength are much higher than the body of the extension frame 2. Therefore, the support frame 22 can effectively resist the huge shear force transmitted by the connecting pin (as well as the shear force applied to the rotating rod 40 and the support rod 41 at the bending point of the support frame 23), prevent the hinge point from deforming, and ensure that the gap does not increase after long-term use. This allows the hinge point to withstand several times the load of ordinary structures, extending its service life and meeting the safety requirements of heavy users or dynamic impacts (such as sudden lowering). Furthermore, this solution provides a stable mounting base for the drive arm 20 and support arm 4 by hinged the drive arm 20 to the support frame 22 and the bends of the rotating rod 40 and support rod 41 to the support frame 23. This clarifies the force transmission path, reduces the risk of jumping or loosening of components during movement, and makes the connection between the drive arm 20, support arm 4 and guide arm 3 more precise and reliable, thereby improving transmission efficiency.

[0041] like Figure 5As shown, this solution also includes a drive motor 50 and a lead screw 51. The drive motor 50 is mounted on the bottom wall of the extension frame 2, and a lead screw bracket 11 is provided on the leg support frame 1. One end of the lead screw 51 is connected to the output end of the drive motor 50, and the other end is movably connected to the lead screw bracket 11, so that when the lead screw 51 rotates, it can drive the extension frame 2 to extend and retract relative to the leg support frame 1. Therefore, for the extension and retraction movement of the extension frame 2 relative to the leg support frame 1, this embodiment mainly achieves this through the cooperation of the drive motor 50 and the lead screw 51 transmission mechanism. That is, by controlling the forward and reverse rotation of the drive motor 50, the extension and retraction movement of the extension frame 2 can be precisely adjusted, which is labor-saving and has high control precision. The lead screw 51 transmission has the characteristics of good self-locking, smooth transmission, and strong load-bearing capacity, which can effectively prevent the leg support from accidentally retracting under load, significantly improving the intelligence level of the product and the user experience. It should be noted that the structure and working principle of the drive motor 50, lead screw 51, lead screw bracket 11, leg support frame 1, and extension frame 2 are the same as those of the prior art, and will not be described in detail here.

[0042] This solution also provides a four-way leg rest, which applies the aforementioned leg rest structure with advantages such as automatic telescopic support, high stability, small space occupation, and high rigidity to a four-way adjustment scenario. This makes the four-way leg rest (the adjustment structure and principle are the same as the existing technology) not only have the flexibility of multi-directional adjustment, but also provide reliable bottom support when unfolded in any direction. This solves the pain point of unstable support when traditional four-way leg rests are unfolded at complex angles, greatly improving the user experience, safety factor and applicability of the product, making it suitable for more diverse usage environments and user needs.

[0043] It should be noted that in this invention, 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" 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 elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If 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 scope of protection claimed by the present invention.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A leg support structure, characterized in that, Includes leg support frame, extension frame, guide arm, and support arm, among which: The extension frame is slidably mounted on the leg support frame to extend and retract relative to the leg support frame; One end of the guide arm is movably connected to the leg support frame, and the other end is movably connected to the support arm. The connection between the guide arm and the support arm is movably hinged to the extension frame to guide the support arm to switch between the retracted position and the extended position of the leg support frame. When the extension frame performs an extension movement, the guide arm is used to guide the support arm to rotate in the forward direction relative to the leg support frame to below the extension frame, so that the support arm provides support to the extension frame in the extended position. When the extended frame performs a retraction movement, the guide arm guides the support arm to rotate in the opposite direction to the retracted position, so that the guide arm and the support arm retract together to the underside of the leg support frame.

2. The leg support structure according to claim 1, characterized in that, A drive arm is movably connected to the extended frame, and the connection between the guide arm and the support arm is movably hinged to the end of the drive arm.

3. A leg support structure according to claim 1 or 2, characterized in that, A fixed bracket is installed on the leg support frame, and a guide hole is provided on the fixed bracket, which is parallel to the moving direction of the extended frame. The end of the guide arm away from the drive arm is movably engaged in the guide hole by a connecting pin.

4. A leg support structure according to claim 2, characterized in that, The drive arm has a waist-shaped hole, and the guide arm and the support arm are hinged together by a connecting shaft, and the connecting shaft is movably engaged in the waist-shaped hole.

5. A leg support structure according to claim 4, characterized in that, The support arm includes a rotating rod and a support rod that are integrally formed at an angle. The end of the rotating rod away from the support rod is movably hinged to the drive arm via the connecting shaft. The end of the support rod away from the rotating rod is used to contact the ground.

6. A leg support structure according to claim 5, characterized in that, The connecting shaft is provided with an anti-detachment block and a mounting groove at both ends. The anti-detachment block is movably attached to the outer wall of the waist-shaped hole. The mounting groove is provided with a limiting block, which abuts against the rotating rod to prevent the connecting shaft from detaching from the waist-shaped hole.

7. A leg support structure according to claim 5, characterized in that, A reinforcing plate is connected between two adjacent support rods.

8. A leg support structure according to claim 5, characterized in that, The extended frame is also equipped with a carrier frame and a support frame. The end of the drive arm away from the guide arm is movably hinged to the carrier frame. The bends of the rotating rod and the support rod are movably hinged to the support frame.

9. A leg support structure according to claim 5, characterized in that, The length of the rotating rod is less than the length of the support rod.

10. A four-way leg rest, characterized in that, Includes a leg support structure as described in any one of claims 1-9.

Images