A seat footrest assembly

Abstract

The utility model relates to the technical field of seat, especially the optimization design of seat footrest structure, a seat footrest subassembly, include: support rod for connecting chair base, footrest, rotating device, assemble in the end of support rod for connecting footrest, rotating device includes rotating cylinder and positioning device, rotating cylinder assemble in the end of support rod, both ends are rotatedly connected with footrest, positioning device is built into the inside of rotating cylinder, positioning device includes pressing piece, positioning rod and linkage mechanism, pressing piece and positioning rod are connected through linkage mechanism, and the pressing piece partially exposes rotating cylinder surface, one end of positioning rod is connected with linkage mechanism, and the other end extends to the positioning hole arranged on footrest, when the pressing piece is pressed into rotating cylinder, positioning rod is driven to separate from the positioning hole through linkage mechanism.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, and in particular to the optimized design of seat footrest structure. Background Technology

[0002] As a key component for improving sitting comfort, the chair footrest needs to be scientifically matched with ergonomic parameters to relieve leg pressure.

[0003] Chinese patent document CN219845747U discloses a leg rest assembly for a chair and a chair. In this technical solution, when the leg rest assembly is folded up, the support member rotates 180° around its axis to fit snugly against the connecting rod, and the entire assembly is hidden in the space under the seat; when in use, it rotates 180° in the opposite direction, and the load-bearing part extends outward to form a leg support platform. When the support member is rotated to the use position, it is locked by the cooperation of a limiting block and a limiting groove, wherein the limiting block is engaged with the limiting groove, and the trapezoidal locking part is prevented from falling off by the toothed engagement of the matching groove.

[0004] However, the above-mentioned device has the following drawbacks: users need to perform two independent operation steps (pulling out the connecting rod and manually moving the limit block) to complete the extension and locking of the support. After long-term and frequent operation, the limit block and related hinge or snap-fit ​​parts may develop gaps or loosening due to mechanical wear, affecting the reliability and durability of the locking effect and potentially increasing maintenance requirements. Utility Model Content

[0005] To overcome the shortcomings of the prior art, a seat footrest assembly is provided.

[0006] This utility model is achieved through the following technical solution: a seat footrest assembly, comprising: a support rod for connecting to a chair base; a footrest; a rotating device assembled at the end of the support rod for connecting to the footrest; the rotating device includes a rotating cylinder and a positioning device; the rotating cylinder is assembled at the end of the support rod, and its two ends are rotatably connected to the footrest; the positioning device is built into the interior of the rotating cylinder; the positioning device includes a pressing element, a positioning rod, and a linkage mechanism; the pressing element and the positioning rod are connected through the linkage mechanism, the pressing element is partially exposed on the surface of the rotating cylinder, one end of the positioning rod is connected to the linkage mechanism, and the other end extends into a positioning hole provided on the footrest; when the pressing element is pressed into the rotating cylinder, the positioning rod is driven to disengage from the positioning hole through the linkage mechanism.

[0007] When adjusting the footrest angle, the user simply presses the exposed pressing element, which triggers a linkage mechanism that drives the positioning rod to retract from the footrest's positioning hole, unlocking the footrest. This unlocking operation is simplified to a single linear pressing action, eliminating the need to rotate the handle or locate a specific slot. After unlocking, the user can freely rotate the footrest to the desired angle. Releasing the pressing element causes the positioning rod to automatically spring out under the action of the elastic reset element, re-inserting into the now-aligned positioning hole on the footrest, thus automatically restoring the locked state. This design simplifies the angle adjustment process, such as pressing to unlock, rotating, and resetting, and in particular, eliminates additional locking steps.

[0008] In a preferred embodiment of this utility model, the linkage mechanism includes two movable sliders and a mating slider; the side of the movable slider is provided with an inwardly inclined first inclined surface; the two movable sliders are arranged opposite to each other; the mating slider is provided with an inclined groove, the inner sidewall of which is a second inclined surface that abuts against the first inclined surface; the second inclined surface presses against the first inclined surface to make the two movable sliders move toward each other.

[0009] In a preferred embodiment of this utility model, the movable slider is provided with a fixing hole for mounting the positioning rod at the bottom of the first inclined surface.

[0010] In a preferred embodiment of this utility model, the linkage mechanism further includes an elastic reset member; the elastic reset member is fixed between the two movable sliders.

[0011] In a preferred embodiment of this utility model, multiple positioning holes are provided, which are opened on the inner side wall of the end of the foot and are evenly distributed along the circumferential axis of the rotating cylinder, and are used to cooperate with the positioning rod to lock the rotation angle.

[0012] In a preferred embodiment of this utility model, the inner wall of the foot end is provided with a rotating shaft connected to the rotating cylinder; bearings connected to the rotating shaft are provided on both sides of the rotating cylinder; the axis of the rotating shaft is consistent with the axis of the rotating cylinder.

[0013] In a preferred embodiment of this utility model, a limiting baffle for fixing the linkage mechanism is provided inside the rotating cylinder; the limiting baffle is arranged on both sides of the linkage mechanism, and the limiting baffle is provided with a through hole for the positioning rod to pass through.

[0014] In a preferred embodiment of this utility model, a sliding sleeve is slidably connected to the support rod; the sliding sleeve is fixed to the bottom of the chair base, and the support rod moves axially within the sliding sleeve.

[0015] In a preferred embodiment of this utility model, a connector that is detachably connected to one end of a support rod is fixed on the rotating cylinder.

[0016] In a preferred embodiment of this utility model, the other end of the support rod is provided with a limiting structure, which is used to prevent the support rod from disengaging from the sliding sleeve.

[0017] Compared with the prior art, the present invention has the following beneficial effects: A seat footrest assembly enables convenient adjustment of the footrest angle. Users can unlock and rotate the footrest simply by pressing it, making the operation simple and the lock secure, thus improving user comfort and functionality.

[0018] Furthermore, by utilizing the mechanical principle of inclined plane transmission, the linear motion of the pressing component is converted into the horizontal movement of the positioning rod. This results in a compact structure with high transmission efficiency, ensuring the reliability and sensitivity of the action.

[0019] Furthermore, the design of the fixing hole ensures the installation accuracy and movement consistency of the positioning rod, prevents the positioning rod from shifting, and improves the stability and durability of the locking structure.

[0020] Furthermore, an automatic reset function is implemented after pressing, eliminating the need for users to manually adjust the positioning rod, making operation more convenient and extending the service life of the mechanism.

[0021] Furthermore, the circumferentially distributed positioning holes provide multiple preset rotation angles, allowing users to choose the most comfortable angle according to their needs, thus enhancing the footrest's applicability and personalized adjustment capabilities.

[0022] Furthermore, the concentric design of the shaft and bearing reduces rotational friction, ensuring smooth and unbiased rotation of the footrest, thus improving structural stability and user experience. Alignment of the axes prevents rotational jamming or wear caused by axis misalignment, extending component lifespan and improving the stability and precision of the footrest's rotation.

[0023] Furthermore, the double-sided limiting baffles effectively suppress vibration and sway during the operation of the linkage mechanism, improving the dynamic stability of the entire device; the cooperation between the positioning rod and the through hole eliminates the relative displacement error between the linkage mechanism and the rotating cylinder, ensuring the synchronization of their movements.

[0024] Furthermore, the length of the footrest component can be quickly adjusted to accommodate the height needs of different users, enhancing the chair's versatility and comfort.

[0025] Furthermore, the detachable design simplifies the installation and maintenance process, allowing users to quickly replace or repair the rotating device, reducing operating costs and maintenance difficulty.

[0026] Furthermore, the limiting structure plays a safety limiting role, avoiding the risk of the support rod falling off due to misoperation or external force, and improving the overall safety and reliability of the foot support assembly.

[0027] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is an assembly diagram of a seat footrest assembly according to the present invention; Figure 2 This is a structural schematic diagram of a seat footrest assembly according to the present invention; Figure 3 This is a front view of the linkage mechanism of this utility model; Figure 4 This is an exploded view of the linkage mechanism of this utility model; Figure 5 This is a schematic diagram of the structure of the rotating cylinder of this utility model; Figure 6 for Figure 5 Enlarged detail of the structure at point A in the middle; Figure 7 This is a schematic diagram of the movable slider of this utility model; The annotations in the attached figures are explained as follows: Support rod 1, chair base 2, footrest 3, rotating device 4, positioning hole 31, rotating cylinder 41, positioning device 42, pressing part 421, positioning rod 422, linkage mechanism 423, moving slider 4231, mating slider 4232, elastic reset part 4233, rotating shaft 5, bearing 411, limiting baffle 412, through hole 4121, sliding sleeve 6, connecting part 7, limiting structure 11, first inclined surface 4231-1, fixing hole 4231-2, inclined groove 4232-1, second inclined surface 4232-2. Detailed Implementation

[0029] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0030] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to facilitate the description of the embodiments and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] like Figures 1 to 7As shown, this embodiment provides a specific implementation of a seat footrest assembly. The assembly mainly consists of a support rod 1, a footrest 3, and a rotating device 4. The support rod 1 is made of aluminum alloy, with one end fixed to the end of the rotating cylinder 41 via a detachable connector 7 (such as a threaded connection or a snap-fit ​​connection), and the other end passing through a sliding sleeve 6 fixed to the bottom crossbeam of the chair base 2. It can slide axially within the sleeve to adjust the extension length of the footrest 3, and the sliding range is limited by a C-shaped retaining ring or other limiting structure 11 to prevent the support rod 1 from completely detaching from the sleeve, ensuring safe use.

[0032] The rotating cylinder 41 of the rotating device 4 is a hollow cylindrical structure. Its two ends are connected to the rotating shaft 5 at the end of the foot rest 3 via bearings 411. The rotating shaft 5 of the foot rest 3 is coaxially arranged with the rotating cylinder 41, ensuring that the foot rest 3 can rotate smoothly around the axis of the rotating cylinder 41. Multiple positioning holes 31 are evenly formed on the inner sidewall of the end of the foot rest 3 along the circumferential direction of the axis of the rotating cylinder 41. The number and angle interval of the positioning holes 31 can be set according to requirements (for example, at least two positioning holes corresponding to the storage position and the use position; or more positioning holes to provide finer angle adjustment levels). In this embodiment, there are 12 positioning holes 31, with adjacent positioning holes spaced 30 degrees apart. The positioning holes 31 cooperate with the positioning rod 422 of the positioning device 42 to lock the rotation angle of the foot rest 3.

[0033] The positioning rod 422 and the positioning hole 31 are connected by an insertion fit along the axis of the positioning rod. When under load, the main supporting force is transmitted axially along the positioning rod 422, effectively avoiding the situation in the prior art where the locking structure mainly bears the lateral shear force, thereby reducing the risk of accidental release of the lock due to the shear force.

[0034] The positioning device 42 is built into the rotating cylinder 41, and its core consists of a pressing element 421, a positioning rod 422, a linkage mechanism 423, and an elastic reset element 4233. The pressing element 421 is a button-type structure, partially exposed on the surface of the rotating cylinder 41 for easy pressing operation by the user; the linkage mechanism 423 is built into the rotating cylinder 41 to isolate the locking state from external collisions or vibrations. The linkage mechanism 423 includes two opposing movable sliders 4231, a mating slider 4232, and an elastic reset member 4233. The mating slider 4232 is fixed on the side of the pressing member 421 near the inner cavity of the rotating cylinder 41. The movable slider 4231 has an inwardly inclined first inclined surface 4231-1 on its side, and a fixing hole 4231-2 is opened at its bottom to fix one end of the positioning rod 422. The positioning rod 422 is fixed in the fixing hole 4231-2 (by screwing or welding). The mating slider 4232 has an inclined groove 4232-1, and its inner sidewall is a second inclined surface 4232-2, which abuts against the first inclined surface 4231-1.

[0035] The limiting baffles 412 inside the rotating cylinder 41 are symmetrically arranged on both sides of the linkage mechanism 423, forming a motion constraint space for the linkage mechanism. When the rotating cylinder 41 rotates, the linkage mechanism 423 is displaced under the action of centrifugal force or the driving device. At this time, the limiting baffles 412 restrict the axial or radial movement range of the linkage mechanism through physical blocking. The design of the positioning rod 422 passing through the through hole 4121 of the baffle not only ensures the synchronous rotation of the linkage mechanism and the rotating cylinder 41, but also achieves precise control of the motion trajectory through the guiding effect of the through hole on the positioning rod.

[0036] When the user presses down on the pressing member 421, the sliding block 4232 moves along the pressing direction. The second inclined surface 4232-2 presses against the first inclined surface 4231-1, forcing the two moving sliding blocks 4231 to move towards each other. This causes the positioning rod 422 to disengage from the positioning hole 31 of the foot rest 3, releasing the rotation lock. At this time, the user can rotate the foot rest 3 to the target angle. The elastic reset member 4233 is horizontally installed between the two inclined sliding blocks 4231. After the pressing member 421 is released, the elastic reset member 4233 (such as a compression spring) pushes the moving sliding block 4231 to reset, and the positioning rod 422 is reinserted into the positioning hole 31, which is now aligned with the positioning rod 422, completing the angle locking.

[0037] This embodiment achieves convenient adjustment of multiple foot rest angles and rapid length adjustment through the above structure. The operation only requires three steps: pressing, rotating, and releasing the pressing part (automatic locking). The locking is stable and without jamming. The concentric design of the rotating shaft and the rotating cylinder 41 reduces rotational friction and extends the life of the parts; the detachable connector 7 simplifies the maintenance process and reduces maintenance costs.

[0038] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A seat footrest assembly comprising: Support rod (1) is used to connect the chair base (2); Rest your feet (3); A rotating device (4), assembled at the end of the support rod (1), is used to connect the footrest (3); characterized in that the rotating device (4) includes a rotating cylinder (41) and a positioning device (42); the rotating cylinder (41) is assembled at the end of the support rod (1), and its two ends are rotatably connected to the footrest (3); the positioning device (42) is built into the interior of the rotating cylinder (41); the positioning device (42) includes a pressing element (421), a positioning rod (422), and a linkage mechanism (423); the The pressing element (421) and the positioning rod (422) are connected by a linkage mechanism (423). The pressing element (421) is partially exposed on the surface of the rotating cylinder (41). One end of the positioning rod (422) is connected to the linkage mechanism (423), and the other end extends into the positioning hole (31) provided on the foot (3). When the pressing element (421) is pressed into the rotating cylinder (41), the positioning rod (422) is driven to disengage from the positioning hole (31) by the linkage mechanism (423).

2. A seat leg rest assembly according to claim 1, wherein, The linkage mechanism (423) includes two movable sliders (4231) and a mating slider (4232); the side of the movable slider (4231) is provided with an inwardly inclined first inclined surface (4231-1); the two movable sliders (4231) are arranged opposite to each other; the mating slider (4232) is provided with an inclined groove (4232-1), and the inner sidewall of the inclined groove (4232-1) is a second inclined surface (4232-2) that abuts against the first inclined surface (4231-1); the second inclined surface (4232-2) presses against the first inclined surface (4231-1) to make the two movable sliders (4231) move towards each other.

3. A seat leg rest assembly according to claim 2, wherein, The movable slider (4231) is provided with a fixing hole (4231-2) at the bottom of the first inclined surface (4231-1) for installing the positioning rod (422).

4. A seat leg rest assembly according to claim 2, wherein, The linkage mechanism (423) also includes an elastic reset member (4233); the elastic reset member (4233) is fixed between two movable sliders (4231).

5. A seat leg rest assembly as defined in claim 1 wherein, The positioning holes (31) are provided in multiple ways, and are opened on the inner side wall of the end of the foot (3). They are evenly distributed along the circumferential axis of the rotating cylinder (41) and are used to cooperate with the positioning rod (422) to lock the rotation angle.

6. A seat leg rest assembly as defined in claim 1 wherein, The inner wall of the end of the foot (3) is provided with a rotating shaft (5) connected to the rotating cylinder (41); the two sides of the rotating cylinder (41) are provided with bearings (411) connected to the rotating shaft (5); the axis of the rotating shaft (5) is consistent with the axis of the rotating cylinder (41).

7. A seat leg rest assembly as defined in claim 1 wherein, The rotating cylinder (41) is provided with a limiting baffle (412) for fixing the linkage mechanism (423); the limiting baffle (412) is arranged on both sides of the linkage mechanism (423), and the limiting baffle (412) is provided with a through hole (4121) for the positioning rod (422) to pass through.

8. A seat leg rest assembly as defined in claim 1 wherein, A sliding sleeve (6) is slidably connected to the support rod (1); the sliding sleeve (6) is fixed to the bottom of the chair base (2), and the support rod (1) moves axially within the sliding sleeve (6).

9. A seat leg rest assembly as defined in claim 1 wherein, The rotating cylinder (41) is fixed with a connector (7) that is detachably connected to one end of the support rod (1).

10. A seat leg rest assembly according to claim 8, wherein, The other end of the support rod (1) is provided with a limiting structure (11), which is used to prevent the support rod (1) from disengaging from the sliding sleeve (6).

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