Footrest mechanism and seat

Abstract

The utility model discloses a kind of footrest mechanism and seat, footrest mechanism includes pedestal and footrest piece, footrest piece includes connecting seat, the footrest plate of being set on connecting seat, pedestal is equipped with opening and closing assembly between connecting seat, opening and closing assembly includes the front connecting rod and rear connecting rod of left-right symmetrical arrangement, each front connecting rod and corresponding rear connecting rod are hinged, the front end of front connecting rod, rear connecting rod rear end is respectively hinged with connecting seat and pedestal;By the existing slide bar design replacement for connecting rod type opening and closing assembly, reduce the probability that footrest mechanism appears jam and abnormal sound when adjusting, install to seat, can effectively improve the adjustment convenience of footrest mechanism and the use experience of seat.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a footrest mechanism and a seat. Background Technology

[0002] Most office chairs or ergonomic chairs are equipped with a footrest mechanism at the bottom of the seat to provide temporary support for the legs or feet when resting. The footrest mechanism generally includes a slide bar that is slidably connected to the seat, with a footrest plate connected to the front end of the slide bar. When the footrest plate is needed, the slide bar slides forward and moves the footrest plate forward to support the feet. After use, the slide bar can be slid in the opposite direction, at which point the footrest plate returns to the bottom of the seat for normal sitting.

[0003] For example, in the patent for a footrest mechanism with publication number CN221229044, two spaced-apart fixing parts are connected to the lower end of the seat. Each fixing part is slidably connected to an adjusting rod through a sliding groove and a fixing block. The front ends of the two adjusting rods are connected to a footrest. The user can adjust the front and back position of the footrest by pulling the footrest or the adjusting rod. However, the drawback of this sliding adjustment footrest mechanism is that when the user pulls the footrest or the adjusting rod, the pulling position is difficult to correspond perfectly with the middle position of the footrest. This makes it difficult to distribute the pulling force evenly to the two adjusting rods. It is easy for one adjusting rod to slide out and the other adjusting rod to lag behind. Therefore, when adjusting the position of the footrest, it is easy for the adjusting rod and the fixing part to get stuck and make abnormal noise. At the same time, it is also easy to damage the adjusting rod, affecting the adjustment convenience of the footrest mechanism and the user experience of the seat. Summary of the Invention

[0004] This utility model provides a footrest mechanism and a seat. By replacing the existing slide bar design with a linkage-type opening and closing component, the probability of jamming and abnormal noise during footrest mechanism adjustment is reduced, thereby improving the adjustment convenience of the footrest mechanism and the user experience of the seat.

[0005] The technical solution of this utility model is implemented as follows: A foot support mechanism includes a base and a foot support component. The foot support component includes a connecting seat and a foot plate disposed on the connecting seat. An opening and closing assembly is provided between the base and the connecting seat. The opening and closing assembly includes a front connecting rod and a rear connecting rod arranged symmetrically on the left and right. Each front connecting rod and its corresponding rear connecting rod are hinged to each other. The front end of the front connecting rod and the rear end of the rear connecting rod are respectively hinged to the connecting seat and the base. The footrest mechanism has an open state and a retracted state. Under the action of external force, the two front links and two rear links that are symmetrically arranged on the left and right rotate inward and move closer together. At this time, the included angle between the front links and the rear links increases, so as to drive the footrest to move forward and the footrest mechanism switches to the open state. When the footrest mechanism switches from the open state to the retracted state, the two front links and two rear links that are symmetrically arranged on the left and right rotate outward and open. At this time, the included angle between the front links and the rear links decreases, so as to drive the footrest to retract backward.

[0006] Preferably, the opening and closing assembly is provided with a linkage structure, which is configured such that when any front link or rear link is subjected to an external force, the two front links and the two rear links are forced to rotate inward to close or rotate outward to open synchronously, in order to prevent the two front links or the two rear links from deflecting to the same side.

[0007] Preferably, the linkage structure is provided between the rear ends of the two rear links and / or between the front ends of the two front links. The linkage structure includes two meshing gears that are fixedly connected to the front ends of the two front links or the rear ends of the two rear links.

[0008] Preferably, the linkage structure is provided between the rear ends of the two rear links and between the front ends of the two front links; so that when any link is subjected to force, the two front links or the two rear links can only rotate toward each other or rotate apart.

[0009] Preferably, the linkage structure includes two meshing linkage gears, and a mounting seat is provided between the front connecting rod and the rear connecting rod on at least one of the left and right sides. The rear end of the front connecting rod and the front end of the rear connecting rod are respectively hinged to the mounting seat, and the two linkage gears are respectively fixedly connected to the rear end of the front connecting rod and the front end of the rear connecting rod.

[0010] Preferably, a positioning gear assembly is provided between the two meshing linkage gears. The positioning gear assembly includes two meshing positioning teeth respectively provided on the two linkage gears. The end faces of the two positioning teeth are provided with positioning protrusions or positioning grooves to ensure that the two front connecting rods or the two rear connecting rods are symmetrical when installed.

[0011] Preferably, the front and rear links, which are hinged to each other, are staggered vertically to prevent interference between the front and rear links when the foot rest is retracted.

[0012] Preferably, the front link is located at the lower end of the rear link; the footrest connected to the front link is positioned as low as possible so that it can be retracted under the seat.

[0013] Preferably, the linkage mechanism includes two linkage rods respectively hinged to the two rear connecting rods, and the two linkage rods are hinged to each other through a rotating shaft; the rotating shaft is slidably connected to the base in the front and rear directions; or, the linkage mechanism includes two linkage rods respectively hinged to the two front connecting rods, and the two linkage rods are hinged to each other through a rotating shaft; the rotating shaft is slidably connected to the connecting seat in the front and rear directions.

[0014] A seat includes a seat and the footrest mechanism, wherein the base is connected to the lower end of the seat.

[0015] The beneficial effects of this utility model, which adopts the above technical solution, are as follows: This invention uses a linkage structure to adjust the position of the footrest. The two symmetrical front and two rear linkages form a layout similar to a four-bar linkage, which means that when adjusting the position of the footrest, there are basically no strict requirements on the position and magnitude of the force applied to the footrest. The user can activate the front and rear linkages in the opening and closing mechanism by applying force to any position of the footrest, thus moving the footrest back and forth. Compared with the sliding rod design in the prior art, the footrest mechanism of this invention has a smoother adjustment and is easier to adjust the position of the footrest. There will be no jamming or abnormal noise. When installed on a seat, it can effectively improve the user experience.

[0016] To ensure that when the foot rest is subjected to external force in any direction, the two front links or the two rear links can rotate outward to open or rotate inward to close synchronously, so as to ensure that the foot rest moves stably only in the front-back direction, this utility model is provided with two meshing linkage gears located at the front end of the two front links or the rear end of the two rear links respectively. When one of the front links or the rear links has a rotational tendency, the other front link or the rear link can respond synchronously, avoiding the entire opening and closing assembly and the foot rest from swaying left and right after being subjected to force, so that the foot rest only moves in the front-back direction to adjust the foot rest position.

[0017] When the footrest retracts, the angle between the front and rear links decreases, making them prone to interference. Therefore, to ensure the footrest can retract smoothly to the predetermined position, the front and rear links are hinged and located at the lower end of the rear link, avoiding interference between the front and rear links. At the same time, because the front link is at a lower height, the corresponding footrest will not interfere with the seat when retracting, allowing the footrest to retract under the seat.

[0018] This utility model is equipped with positioning teeth that are respectively set on two linkage gears and mesh with each other. The positioning teeth are provided with positioning grooves or positioning protrusions, which can serve as installation marks. During installation, as long as the two positioning teeth are meshed with each other, the two front linkages and the two rear linkages can be kept symmetrical from left to right. This makes the axis of symmetry of the opening and closing component coincide as much as possible with the middle position of the footrest and the seat, ensuring that the footrest is always in the correct support position during use. Attached Figure Description

[0019] Figure 1 A schematic diagram of the footrest mechanism on the chair seat; Figure 2 This is a schematic diagram of the footrest mechanism on the chair seat, viewed from a low angle. Figure 3 A schematic diagram showing the foot support mechanism in the fully open position; Figure 4 This is a schematic diagram showing the foot support mechanism in the opening position. Figure 5This is a schematic diagram showing the foot rest mechanism in its fully retracted state. Figure 6 Exploded view of the foot support mechanism; Figure 7 A side view of a seated person using their feet to act on the footrest; Figure 8 A side view showing the occupant exerting force forward and causing the footrest to move forward; Figure 9 A side view showing the foot piece moved forward to the predetermined position; Figure 10 A side view of a seated person with their feet resting on the footrest; Figure 11 A simplified schematic diagram showing the two front connecting rods coinciding with the hinge points of the connecting seat and the two rear connecting rods coinciding with the hinge points of the base. Figure 12 A simplified schematic diagram illustrating the linkage structure between the front link and the corresponding rear link; Figure 13 This is a schematic diagram of another linkage structure in Example 2; The reference numerals for each figure are as follows: 1-base, 11-extension, 12-slide groove, 2-foot rest, 21-foot rest plate, 22-connecting seat, 221-shaft seat, 222-shaft cover, 3-front connecting rod, 4-rear connecting rod, 5-linkage gear, 51-positioning tooth, 52-positioning protrusion, 53-positioning groove, 6-seat, 7-mounting seat, 8-linkage rod, 81-rotating shaft, s-gap. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0022] This utility model has several specific embodiments, and the specific implementation methods are as follows: Example 1: As Figure 1-12As shown, this embodiment provides a footrest mechanism, which is typically installed on a seat. The footrest mechanism includes a base 1 and a footrest 2. The footrest 2 includes a connecting seat 22 and a footrest plate 21 disposed on the connecting seat 22. The footrest plate 21 and the connecting seat 22 can be fixedly connected or movably connected. For example, the connecting seat 22 and the footrest plate 21 shown in this embodiment are rotatably connected. Specifically, the connecting seat 22 includes a shaft seat 221 and a shaft cover 222 that can be joined together and locked by screws. The connecting seat 22 has a shaft hole through which the shaft seat 221 and the shaft cover 222 pass. The footrest plate 21 includes two footrest support plates. A rotating support shaft is integrally formed between the two feet. The rotating support shaft is matched and disposed in the shaft hole so that the footrest plate 21 can be flipped forward to open or rotated backward to retract.

[0023] Furthermore, an opening and closing assembly is provided between the base 1 and the connecting seat 22. The opening and closing assembly includes a front connecting rod 3 and a rear connecting rod 4 arranged symmetrically on the left and right sides. Each front connecting rod 3 and its corresponding rear connecting rod 4 are hinged to each other. The hinge method can be direct hinge, or a mounting seat 7 can be provided between them, and the front connecting rod 3 and the rear connecting rod 4 can be simultaneously hinged to the mounting seat 7, so that the front connecting rod 3 and the rear connecting rod 4 on the same side are indirectly hinged. The preferred hinge position is the rear end of the front connecting rod 3 and the front end of the rear connecting rod 4. The front end of the front connecting rod 3 and the rear end of the rear connecting rod 4 are respectively hinged to the connecting seat 22 and the base 1. The base 1 and the connecting seat 22 each have two mutually spaced extensions 11. The front ends of the two front connecting rods 3 are hinged between the two extensions 11 of the connecting seat 22 through a rotating shaft, and the rear ends of the two rear connecting rods 4 are hinged between the two extensions 11 of the base 1 through a rotating shaft. The hinge position of the front ends of the two front connecting rods 3 and the connecting seat 22 can be as follows: Figure 6 They can be staggered as shown, or as... Figure 12 As shown, they overlap. In this embodiment, the front ends of the two front connecting rods 3 are preferably offset from the hinged positions of the connecting seat 22; correspondingly, the hinged positions of the two rear connecting rods 4 and the base 1 can be as shown. Figure 6 They can be staggered as shown, or as... Figure 12 As shown, they overlap with each other; in this embodiment, the hinge positions of the two rear connecting rods 4 and the base 1 are preferably staggered; compared with the adjustment mechanism that uses a sliding rod and a slide rail, in this embodiment, the two front connecting rods 3 and the two rear connecting rods 4 together form a structure similar to a four-bar linkage. When the foot rest 2 needs to be adjusted in the front and back position, the four-bar linkage can deform to move the foot rest 2 back and forth in linkage. There is no phenomenon of the sliding rod and the slide rail getting stuck, so the adjustment of the foot rest 2 position is smoother.

[0024] Furthermore, a seat is provided, including a seat 6 and the aforementioned footrest mechanism, wherein the base 1 is connected to the lower end of the seat 6, allowing the footrest 2 to move back and forth to provide temporary foot support for the person sitting on the seat 6.

[0025] The foot rest mechanism has an open state and a retracted state, such as Figure 7-10 As shown, due to the linkage structure design, the footrest mechanism in this embodiment almost completely avoids the jamming phenomenon when adjusting the footrest 2. The occupant doesn't even need to bend over and use their hands to operate the footrest 2. The occupant can control the position of the footrest 2 with their feet from a sitting or reclining position. Specifically, when the footrest mechanism is in the retracted state, the footrest 2 is located under the seat 6, with a gap s between the footrest 2 and the seat 6. The occupant can lift their leg and insert their foot into this gap s, placing their foot on the left or right side of the footrest 2, and then exert force forward, causing the two symmetrical front linkages 3 and two rear linkages 4 to move inward. When the footrest is rotated and brought closer together, the angle between the front link 3 and the rear link 4 increases, causing the footrest 2 to move forward. The footrest mechanism switches to the open state, at which point the person sitting can use their feet to rotate the footrest 21 forward and place their feet on it. When the footrest mechanism switches from the open state to the retracted state, the person sitting can first rotate the footrest 21 backward and then use their feet to apply force to the footrest 2 again, causing the two symmetrical front links 3 and two rear links 4 to rotate outward and open. At this time, the angle between the front link 3 and the rear link 4 decreases, causing the footrest 2 to retract backward and return to the position under the seat 6.

[0026] Furthermore, when the foot rest 2 is subjected to an external force, causing the front link 3 or the rear link 4 to tend to rotate, in order to prevent the opening and closing assembly and the foot rest 2 from shifting to the left or right, the opening and closing assembly in this embodiment is provided with a linkage structure. The linkage structure is configured such that when any front link 3 or rear link 4 is subjected to an external force, it forces the two front links 3 and the two rear links 4 to rotate inward to close or rotate outward to open simultaneously; to prevent the two front links 3 or the two rear links 4 from deflecting to the left or right simultaneously. The linkage structure is provided between the rear ends of the two rear links 4 and / or between the front ends of the two front links 3, that is, at least one of the rear ends of the two rear links 4 and the front ends of the two front links 3 is provided with the linkage structure. The linkage structure includes two meshing and fixedly connected linkage gears 5 to the front ends of the two front links 3 or the rear ends of the two rear links 4 respectively; so that when any link is subjected to force, the two front links 3 or the two rear links 4 can only In this embodiment, the linkage structure is preferably provided between the rear ends of the two rear connecting rods 4 and between the front ends of the two front connecting rods 3. Taking two linkage gears 5 set between the rear ends of the two rear connecting rods 4 as an example, the two linkage gears 5 are respectively fixed to the rear ends of the two rear connecting rods 4, and the rotation center of each linkage gear 5 coincides with the rotation center of the rear end of the rear connecting rod 4. Correspondingly, taking two linkage gears 5 set between the front ends of the two front connecting rods 3 as an example, the two linkage gears 5 are respectively fixed to the front ends of the two front connecting rods 3, and the rotation center of each linkage gear 5 coincides with the rotation center of the front end of the front connecting rod 3. When one of the front connecting rods 3 or the rear connecting rod 4 has a swing tendency, the two meshing linkage gears 5 can force the two front connecting rods 3 and the two rear connecting rods 4 to rotate closer or further apart, so as not to cause the entire opening and closing assembly to wobble to the left or right.

[0027] Furthermore, the linkage mechanism can also be set between the front link 3 and the rear link 4 on the same side. Specifically, a mounting seat 7 is provided between the front link 3 and the rear link 4 on at least one of the left and right sides. The rear end of the front link 3 and the front end of the rear link 4 are respectively hinged to the mounting seat 7. The hinge points of the rear end of the front link 3 and the front end of the rear link 4 with the mounting seat 7 are preferably staggered. Two linkage gears 5 are respectively fixedly connected to the rear end of the front link 3 and the front end of the rear link 4, and the rotation centers of the two linkage gears 5 coincide with the rotation centers of the rear end of the front link 3 and the front end of the rear link 4, respectively. When one of the front link 3 or the rear link 4 has a swing tendency, the two meshing linkage gears 5 can force the left and right front link 3 and the rear link 4 to rotate closer or further apart, which can also limit the entire opening and closing assembly from swinging to the left or right.

[0028] Furthermore, to ensure that the front connecting rods 3 and rear connecting rods 4 on both sides are symmetrical when the opening and closing assembly is installed, and thus ensure that the footrest 2 always corresponds to the center position of the seat 6, a positioning gear assembly is provided between the two meshing linkage gears 5 in this embodiment. The positioning gear assembly includes two meshing positioning teeth 51 respectively provided on the two linkage gears 5. The end faces of the two positioning teeth 51 are provided with positioning protrusions 52 or positioning grooves 53. When the opening and closing assembly is installed, the positioning protrusions 52 or positioning grooves 53 can be used as installation marks to make the two positioning teeth 51 mesh with each other. At this time, the two front connecting rods 3 or the two rear connecting rods 4 will automatically form a left-right symmetrical structure, ensuring that the footrest 2 will not shift to the center position of the seat 6.

[0029] Furthermore, in this embodiment, the front link 3 and the rear link 4 can be at the same height. However, when the foot rest 2 retracts, the angle between the front link 3 and the rear link 4 gradually decreases. The front link 3 and the rear link 4, which are at the same height, are prone to interfering with each other. Therefore, in this embodiment, the front link 3 and the rear link 4, which are hinged to each other, are staggered vertically so that when the foot rest 2 retracts, the front link 3 and the rear link 4 can overlap vertically.

[0030] Furthermore, in this embodiment, the front link 3 can be located at the upper end of the rear link 4 or at the lower end of the rear link 4, but in this embodiment, the front link 3 is preferably located at the lower end of the rear link 4; so that the height position of the footrest 2 connected to the front link 3 is as low as possible, so that the footrest 2 can be smoothly retracted under the seat 6 without interfering with the seat 6.

[0031] Example 2: As Figure 13 As shown, the difference between this embodiment and the above embodiment is that this embodiment provides another linkage structure. Specifically, the linkage mechanism in this embodiment includes two linkage rods 8 respectively hinged to the two rear connecting rods 4. The two linkage rods 8 are hinged to each other through a rotating shaft 81, the cross-sectional shape of which is usually circular. The base 1 has a connecting part corresponding to the position of the rotating shaft 81. The connecting part is provided with a sliding groove 12 corresponding to the position of the rotating shaft 81 and extending in the front-back direction. The rotating shaft 81 is matched and inserted into the sliding groove 12, so that the rotating shaft 81 and the base 1 are slidably connected in the front-back direction. When one of the rear connecting rods 4 has a tendency to rotate, the two linkage rods 8 can link the other rear connecting rod 4 to rotate synchronously, so that the two rear connecting rods 4 rotate inward to move closer or rotate outward to open. At the same time, in order to prevent the two linkage rods 8 from being collinear and causing the entire opening and closing assembly to jam, the linkage rods 8 in this embodiment are relatively long and the two linkage rods 8 are always in a V-shaped structure.

[0032] Furthermore, in addition to opening the slide groove 12, a sliding connection assembly (not shown) can also be installed on the base 1. The sliding connection includes a guide seat connected to the base 1 and a sliding seat that is slidably connected to the guide seat. The sliding seat is connected to the rotating shaft 81, which can also indirectly slide the rotating shaft 81 to the base 1 to achieve the same sliding connection effect as the above structure.

[0033] Furthermore, the two linkage rods 8 can also be hinged to the two front linkage rods 3 respectively (this design is not shown in the figure), and the two linkage rods 8 are hinged to each other through a rotating shaft 81; correspondingly, the aforementioned sliding groove 12 can also be provided on the connecting seat 22, so that the rotating shaft 81 can be inserted into the sliding groove 12, so that the rotating shaft 81 and the connecting seat 22 can slide back and forth; the same linkage effect as the above structure can also be achieved.

[0034] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A foot support mechanism, characterized in that, It includes a base (1) and a foot rest (2). The foot rest (2) includes a connecting seat (22) and a foot plate (21) set on the connecting seat (22). An opening and closing assembly is provided between the base (1) and the connecting seat (22). The opening and closing assembly includes a front connecting rod (3) and a rear connecting rod (4) arranged symmetrically on the left and right. Each front connecting rod (3) and the corresponding rear connecting rod (4) are hinged to each other. The front end of the front connecting rod (3) and the rear end of the rear connecting rod (4) are respectively hinged to the connecting seat (22) and the base (1). The footrest mechanism has an open state and a retracted state. Under the action of external force, the two front connecting rods (3) and the two rear connecting rods (4) that are symmetrical on the left and right rotate inward and move closer together. At this time, the included angle between the front connecting rod (3) and the rear connecting rod (4) increases to drive the footrest (2) to move forward, and the footrest mechanism switches to the open state. When the footrest mechanism switches from the open state to the retracted state, the two front connecting rods (3) and the two rear connecting rods (4) that are symmetrical on the left and right rotate outward and open. At this time, the included angle between the front connecting rod (3) and the rear connecting rod (4) decreases to drive the footrest (2) to retract backward.

2. The foot support mechanism according to claim 1, characterized in that: The opening and closing assembly is equipped with a linkage structure. The linkage structure is configured such that when any front link (3) or rear link (4) is subjected to an external force, the two front links (3) and the two rear links (4) are forced to rotate inward to close or rotate outward to open synchronously.

3. The foot support mechanism according to claim 2, characterized in that: The linkage structure is provided between the rear ends of the two rear links (4) and / or between the front ends of the two front links (3). The linkage structure includes two meshing gears (5) that are fixedly connected to the front ends of the two front links (3) or the rear ends of the two rear links (4).

4. The foot support mechanism according to claim 3, characterized in that: The aforementioned linkage structure is provided between the rear ends of the two rear links (4) and between the front ends of the two front links (3).

5. The foot rest mechanism according to claim 2, characterized in that: The linkage structure includes two meshing linkage gears (5), and a mounting seat (7) is provided between the front link (3) and the rear link (4) on at least one of the left and right sides. The rear end of the front link (3) and the front end of the rear link (4) are respectively hinged to the mounting seat (7), and the two linkage gears (5) are respectively fixedly connected to the rear end of the front link (3) and the front end of the rear link (4).

6. The foot support mechanism according to any one of claims 3-5, characterized in that: A positioning tooth assembly is provided between the two meshing linkage gears (5). The positioning tooth assembly includes two meshing positioning teeth (51) respectively provided on the two linkage gears (5). The end faces of the two positioning teeth (51) are provided with positioning protrusions (52) or positioning grooves (53).

7. The foot rest mechanism according to claim 1, characterized in that: The front link (3) and the rear link (4) are hinged to each other and staggered vertically.

8. The foot rest mechanism according to claim 7, characterized in that: The front link (3) is located at the lower end of the rear link (4).

9. The foot rest mechanism according to claim 1, characterized in that: The linkage mechanism includes two linkage rods (8) respectively hinged to the two rear connecting rods (4), and the two linkage rods (8) are hinged to each other through a rotating shaft (81); the rotating shaft (81) is slidably connected to the base (1) in the front and rear directions; or, the linkage mechanism includes two linkage rods (8) respectively hinged to the two front connecting rods (3), and the two linkage rods (8) are hinged to each other through a rotating shaft (81); the rotating shaft (81) is slidably connected to the connecting seat (22) in the front and rear directions.

10. A type of seat, characterized in that, Includes a seat (6) and a footrest mechanism as described in claim 1, wherein the base (1) is connected to the lower end of the seat (6).

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