Footrest mechanism for furniture

Abstract

Footrest mechanism for furniture, comprising a footrest device mounted on a seat cushion frame, wherein the footrest device is movable and has a retracted position and an extended position relative to the seat cushion frame, characterized in that the footrest mechanism for furniture further comprises a guide structure and a locking structure mounted on the seat cushion frame, wherein during the movement between the retracted position and the extended position the guide structure is configured to guide the movement of the footrest device, and the locking structure is configured to prevent the footrest device from detaching from the guide structure in a left-right direction and / or an up-down direction of the seat cushion frame.

Description

AREA OF INVENTION

[0001] The present application relates to furniture and in particular to a footrest mechanism suitable for furniture such as sofas. BACKGROUND OF THE INVENTION

[0002] With the ongoing development of the economy and the progress of society, more and more consumer goods are being provided to improve people's lives, with sofas being a common example.

[0003] Currently, adjustable floor-standing sofas with armrests are equipped with an internal extendable metal frame. This extendable metal frame includes a footrest, a seat cushion, and a backrest mechanism. A series of mechanical links allows the relative positions and angles of the seat cushion and backrest to be adjusted, enabling the sofa to switch between sitting, resting, and fully reclined positions to meet user requirements.

[0004] In existing extendable metal frames, the seat cushion mechanism is equipped with a guide groove structure along which the footrest moves when switching between the retracted and extended positions. This ensures smooth extension and retraction of the footrest under the support and guidance of the guide groove structure. However, during use or transport of the sofa, an operator may lift the footrest upwards. This causes the footrest to detach from the guide groove structure, making it difficult to realign the footrest properly. Because the extendable metal frame is covered by the sofa, the operator cannot visually confirm the correct realignment of the footrest with the guide groove structure.

[0005] Therefore, there is an urgent need for a foot support mechanism for furniture to overcome one or more of the aforementioned disadvantages. SUMMARY OF THE INVENTION

[0006] One objective of the present application is to provide a footrest mechanism for furniture that prevents the footrest device from accidentally detaching from a guide structure and ensures that the footrest device reliably switches between a retracted position and an extended position.

[0007] To achieve the aforementioned objective, the present application provides a footrest mechanism for furniture, comprising a footrest device mounted on a seat cushion frame, wherein the footrest device is movable and has a retracted position and an extended position relative to the seat cushion frame. The footrest mechanism for furniture further comprises a guide structure and a locking structure mounted on the seat cushion frame, wherein, during movement between the retracted position and the extended position, the guide structure is configured to guide the movement of the footrest device, and the locking structure is configured to prevent the footrest device from detaching from the guide structure in a left-right direction and / or an up-down direction of the seat cushion frame.

[0008] In contrast to the prior art, the present application features a locking structure mounted on the seat cushion frame that, during the movement of the footrest device between the retracted and extended positions, prevents the footrest device from detaching from the guide structure in the left-right direction and / or the up-down direction of the seat cushion frame. This prevents the footrest device from accidentally detaching from the guide structure when an operator lifts it, thus ensuring that the footrest device reliably switches between the retracted and extended positions.

[0009] Preferably, the guide structure is provided with a guide groove to guide the movement of the footrest device, wherein the footrest device is inserted into the guide groove from above and is limited in the lateral direction; the locking structure comprises an upper locking structure which is located above the guide groove, and the upper locking structure is designed to prevent the footrest device from moving upwards out of the guide groove.

[0010] Preferably, the guide structure is rotatably mounted on the seat cushion frame, a center line of rotation of the guide structure extends in the left-right direction of the seat cushion frame, and the guide groove extends completely circularly around the center line of rotation.

[0011] Preferably, the locking structure further comprises a rear locking structure located behind the guide structure, wherein the rear locking structure is also located below the upper locking structure, the rear locking structure is provided with a connecting groove connected to the guide groove, and a groove side wall of the connecting groove located away from the seat cushion frame is longitudinally higher than a groove side wall of the guide groove located away from the seat cushion frame.

[0012] Preferably, a groove side wall of the connecting groove near the seat cushion frame is offset in the left-right direction of the seat cushion frame relative to a groove side wall of the guide groove near the seat cushion frame, and the groove side wall of the connecting groove near the seat cushion frame lies between the seat cushion frame and the groove side wall of the guide groove near the seat cushion frame.

[0013] Preferably, the footrest device comprises a front footrest swivel link, a rear footrest swivel link, a first intermediate link, a front footrest connecting link, a rear footrest connecting link, a second intermediate link, and a first long link and a second long link, each extending in a front-to-rear direction of the seat cushion frame; the first intermediate link is located below the seat cushion frame and extends in the front-to-rear direction of the seat cushion frame; the front footrest swivel link is pivotably connected to both the seat cushion frame and a front end of the first intermediate link; the rear footrest swivel link is pivotably connected to both the seat cushion frame and a rear end of the first intermediate link; an upper end of the rear footrest connecting link is pivotably connected to a rear end of the first long link.A lower end of the rear footrest connecting link is pivotally connected to the rear footrest swivel link; a lower end of the front footrest connecting link is pivotally connected to the front footrest swivel link; an upper end of the front footrest connecting link is successively pivotally connected to a rear end of the second long link and the rear end of the first long link; the second intermediate link is pivotally connected to both the rear footrest connecting link and the front footrest swivel link; a front end of the first long link is pivotally connected to a first footrest section having a support section; a position of the first footrest section spaced from the first long link is pivotally connected to a second footrest section having a support section; the second footrest section is pivotally connected to a short link.and a front end of the second long link is successively pivotably connected to the first footrest section and the short link; the guide structure is designed to allow the first long link to slide along it, and the locking structure is designed to prevent the first long link from detaching from the guide structure in the left-right direction and / or the up-down direction of the seat cushion frame.

[0014] Preferably, when the footrest device is switched to the retracted position, the support sections of the first footrest section and the second footrest section are arranged such that one is directed forwards and one downwards, while the first long link and the second long link are also slidably retracted into the seat cushion frame; when the footrest device is switched to the extended position, the support sections of the first footrest section and the second footrest section are arranged facing upwards, while the first long link and the second long link are also slidably extended out of the seat cushion frame.

[0015] Preferably, the front footrest swivel link is provided with a front upper pivot point, a front lower pivot point, and a central front pivot point located between the front upper pivot point and the front lower pivot point; the seat cushion frame is pivotably connected to the front upper pivot point, the front footrest connecting link is pivotably connected to the front lower pivot point, and the first intermediate link is pivotably connected to the central front pivot point; the rear footrest swivel link is provided with a rear upper pivot point, a rear lower pivot point, and a central rear pivot point located between the rear upper pivot point and the rear lower pivot point;The seat cushion frame is pivotally connected to the rear upper pivot point, the rear footrest linkage is pivotally connected to the rear lower pivot point, and the first intermediate linkage is further pivotally connected to the central rear pivot point.

[0016] Preferably, the front footrest swivel link is further provided with a lower pivot point located below the front lower pivot point, the rear footrest connecting link is provided with a rear middle pivot point and a rear upper pivot point which is pivotably connected to the rear end of the first long link, the second intermediate link is pivotably connected to the lower pivot point and the rear middle pivot point, and the rear middle pivot point is located between the rear lower pivot point of the rear footrest swivel link and the rear upper pivot point of the rear footrest connecting link.

[0017] Preferably, the front footrest connecting link is further provided with a front central pivot point and a front upper pivot point, wherein the rear end of the second long link is pivotably connected to the front central pivot point of the front footrest connecting link and the first long link is pivotably connected to the front upper pivot point of the front footrest connecting link. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of the footrest mechanism for furniture according to the present application, mounted on a seat cushion frame, wherein the footrest device is in a retracted position. Fig. 2 is a top view of Fig. 1, viewed from the direction opposite to arrow A. Fig. 3 is an exploded view of Fig. 1. Fig. 4 is a perspective view of Fig. 1 from a different angle. Fig. 5 is an exploded view of Fig. 4. Fig. Figure 6 is a perspective view of the footrest mechanism for furniture according to the present application, mounted on a seat cushion frame, wherein the footrest device is in an extended position. Fig. 7 is a top view of Fig. 6, viewed from the direction opposite to arrow A. Fig. 8 is an exploded view of Fig. 7. Fig. Figure 9 is a perspective view showing the guide structure and the locking structure of the foot support mechanism for furniture according to the present application, mounted on the seat cushion frame. Fig. 10 is a top view of Fig. 9, viewed in the direction of arrow C. DETAILED DESCRIPTION OF THE ILLUSTRATED EXECUTION FORMS

[0018] Preferred embodiments of the present application are described below in conjunction with the drawings provided in the description.

[0019] With reference to Fig. 1, Fig. 2, Fig. 6 and Fig. 7. The footrest mechanism for furniture 100 of the present application comprises a footrest device 10 mounted on a seat cushion frame 200, as well as a guide structure 20 and a locking structure 30 mounted on the seat cushion frame 200. The seat cushion frame 200 provides support for the footrest device 10, the guide structure 20, and the locking structure 30. Optionally, in Fig. 9 and Fig. In one embodiment, the locking structure 30 is first mounted on the seat cushion frame 200, and subsequently the guide structure 20 is mounted on the locking structure 30, so that the guide structure 20 is indirectly mounted on the seat cushion frame 200 via the locking structure 30. Obviously, the guide structure 20 could also be mounted directly on the seat cushion frame 200, depending on the actual requirements, which is not related to the fact that in Fig. 9 and Fig. The number of images shown is limited to 10.

[0020] Specifically, the footrest device 10 is positioned, at least relative to the seat cushion frame 200, towards the rear in a manner that Fig. 1, Fig. 2 or Fig. 4 shown retracted position or relative to the seat cushion frame 200 forward into a position in Fig. 6 or Fig. The extended position shown in section 7 is movable to meet user requirements. For example, if a user wishes to rest their feet, the footrest 10 is moved forward relative to the seat cushion frame 200 into the position shown. Fig. 6 or Fig. The footrest mechanism 10, shown in the extended position 7, moves forward out of the seat cushion frame 200 to provide the footrest. When the footrest is not needed, the footrest mechanism 10 is moved backward relative to the seat cushion frame 200 into the space shown in the text. Fig. 1, Fig. 2 or Fig. 4 shown retracted position moved and thereby retracted back towards the seat cushion frame 200 into a stowed state.

[0021] Furthermore, the guide structure 20 is designed to guide the movement of the footrest device 10 during the movement between the retracted and extended positions. That is, during the movement between the retracted and extended positions, the footrest device 10 moves along the guide structure 20. Optionally, it supports in Fig. In one embodiment, the guide structure 20 also supports the footrest 10 from below, so that the footrest 10 moves along the guide structure 20 while being supported by it, thereby more effectively improving the smoothness and stability of the movement of the footrest 10 along the guide structure 20. Additionally, during the movement of the footrest 10 between the retracted and extended positions, the locking structure 30 is designed to prevent the footrest 10 from detaching from the guide structure 20 in a left-right direction and / or an up-down direction of the seat cushion frame 200.Therefore, the locking structure 30 ensures that the footrest 10 always maintains a correct engagement position with the guide structure 20, thus guaranteeing the reliability of switching the footrest 10 between the retracted and extended positions along the guide structure 20. The specific structures of the footrest 10, the guide structure 20, and the locking structure 30 are described below.

[0022] As in Fig. 9 and Fig. As shown in Figure 10, in one embodiment the guide structure 20 is provided with a guide groove 21 along which the footrest device 10 can move. The footrest device 10 (specifically the first long link 17 of the footrest device 10) is inserted into the guide groove 21 from above and is laterally limited, as shown in Figure 10. Fig. Figure 8 shows that the first long link 17, arranged within the guide groove 21, is limited in the left-right direction by the guide structure 20 and cannot slide laterally, thereby improving the reliability of the movement of the footrest device 10 along the guide structure 20. The locking structure 30 includes an upper locking structure 31, which is located above the guide groove 21. The upper locking structure 31 is designed to prevent the footrest device 10 (specifically, the first long link 17 of the footrest device 10) from moving upwards out of the guide groove 21. Thus, the interaction of the guide groove 21 and the upper locking structure 31 prevents the footrest device 10 from detaching from the guide structure 20 in the up-down and left-right directions of the seat cushion frame 200.

[0023] Specifically, in Fig. 9 and Fig. In one embodiment, the guide structure 20 is rotatably mounted on the seat cushion frame 200. A rotation centerline 22 of the guide structure 20 extends in the left-right direction of the seat cushion frame 200. The guide groove 21 extends in a complete circle around the rotation centerline 22. This configuration can effectively reduce the frictional resistance of the movement of the footrest device 10 along the guide structure 20, thereby making the movement of the footrest device 10 along the guide structure 20 more flexible and uniform. Furthermore, it comprises Fig. 9 and Fig. In one embodiment, the locking structure 30 further comprises a rear locking structure 32, which is located behind the guide structure 20. The rear locking structure 32 is also located below the upper locking structure 31. The rear locking structure 32 is provided with a connecting groove 321, which is connected to the guide groove 21. A groove side wall 3211 of the connecting groove 321, located away from the seat cushion frame 200, extends upwards higher than a groove side wall 211 of the guide groove 21, also located away from the seat cushion frame 200. This configuration effectively prevents the footrest device 10 from detaching from the guide structure 20 in the left-right direction of the seat cushion frame 200. More precisely, in Fig. Figure 10, in one embodiment, describes a groove side wall 3212 of the connecting groove 321, located near the seat cushion frame 200, offset in the left-right direction of the seat cushion frame 200 relative to a groove side wall 212 of the guide groove 21, also located near the seat cushion frame 200. The groove side wall 3212 of the connecting groove 321, located near the seat cushion frame 200, lies between the seat cushion frame 200 and the groove side wall 212 of the guide groove 21, as shown in Figure 10. Fig. 10 shown. This configuration can prevent the groove side wall 3212 of the connecting groove 321, which is close to the seat cushion frame 200, from coming into contact with the footrest device 10 (specifically the first long link 17), thereby effectively reducing the frictional resistance during the movement of the footrest device 10.

[0024] As in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. As shown in Figure 8, in one embodiment the footrest device 10 comprises a front footrest swivel link 11, a rear footrest swivel link 12, a first intermediate link 13, a front footrest connecting link 14, a rear footrest connecting link 15, a second intermediate link 16, and a first long link 17 and a second long link 18, each extending in the front-to-rear direction of the seat cushion frame 200. Optionally, in Fig. 2 and Fig. 7 the first long link 17 is longer than the second long link 18, and the first long link 17 is also spaced apart from the second long link 18 in the left-right direction of the seat cushion frame 200, such that the first long link 17 lies between the seat cushion frame 200 and the second long link 18, as shown in Fig. 3 shown.

[0025] Specifically, the first intermediate link 13 is located below the seat cushion frame 200 and extends in the front-to-rear direction of the seat cushion frame 200. The front footrest swivel link 11 is connected to both the seat cushion frame 200 and a front end 131 (see Fig. 7) of the first intermediate link 13 is pivotally connected. The rear footrest swivel link 12 is connected to both the seat cushion frame 200 and a rear end 132 (see Fig. 7) of the first intermediate link 13 pivotably connected. An upper end 151 of the rear footrest connecting link 15 is pivotably connected to a rear end 171 of the first long link 17, and a lower end 152 of the rear footrest connecting link 15 is pivotably connected to the rear footrest swivel link 12. A lower end 141 of the front footrest connecting link 14 is pivotably connected to the front footrest swivel link 11, and an upper end 142 of the front footrest connecting link 14 is successively pivotably connected to a rear end 181 of the second long link 18 and the rear end 171 of the first long link 17.The second intermediate link 16 is pivotally connected to both the rear footrest connecting link 15 and the front footrest swivel link 11, so that the speed at which the combination of the second intermediate link 16 and the rear footrest connecting link 15 drives the first long link 17 is greater than the speed at which the front footrest connecting link 14 drives the second long link 18, thereby creating a speed difference between the first long link 17 and the second long link 18.

[0026] Furthermore, a front end 172 of the first long link 17 is pivotally connected to a first footrest section 19a, which has a support section 191. A position of the first footrest section 19a spaced apart from the first long link 17 is pivotally connected to a second footrest section 19b, which has a support section 192. The second footrest section 19b is pivotally connected to a short link 19c. A front end 182 of the second long link 18 is successively pivotally connected to the first footrest section 19a and the short link 19c. Therefore, when the footrest device 10 is in the Fig. 6 or Fig. Figure 7 shows the extended position being switched, with the support sections 191, 192 of the first footrest section 19a and the second footrest section 19b arranged facing upwards, while the first long link 17 and the second long link 18 are also slidably extended from the seat cushion frame 200, as shown in Figure 7. Fig. 7 shown to meet the user's need for a footrest. When the footrest device 10 is inserted into the Fig. 1, Fig. 2 or Fig. When the retracted position shown in Figure 4 is switched, the support sections 191, 192 of the first footrest section 19a and the second footrest section 19b are arranged such that one is directed forward and one downward, while the first long link 17 and the second long link 18 are also slidably retracted into the seat cushion frame 200, as shown in Figure 4. Fig. 2 shown, to prevent the first footrest section 19a and the second footrest section 19b from protruding outwards from the seat cushion frame 200 in this position. It should be noted that when the footrest device 10 comprises the front footrest swivel link 11, the rear footrest swivel link 12, the first intermediate link 13, the front footrest connecting link 14, the rear footrest connecting link 15, the second intermediate link 16, the first long link 17 and the second long link 18, the guide structure 20 is configured to allow the first long link 17 to slide along it, and the locking structure 30 is configured to prevent the first long link 17 from detaching from the guide structure 20 in the left-right direction and / or the up-down direction of the seat cushion frame 200. Furthermore, a more specific structure of the foot support device 10 is described below.

[0027] As in Fig. 2 and Fig. As shown in Figure 7, in one embodiment the front footrest swivel link 11 is provided with a front upper pivot point 111, a front lower pivot point 112, and a central front pivot point 113 located between the front upper pivot point 111 and the front lower pivot point 112. The seat cushion frame 200 is pivotably connected to the front upper pivot point 111, the front footrest connecting link 14 is pivotally connected to the front lower pivot point 112, and the first intermediate link 13 is pivotally connected to the central front pivot point 113, thus ensuring that the pivot points at which the front footrest swivel link 11 is connected to the first intermediate link 13 and to the front footrest connecting link 14 do not coincide. Additionally, in Fig. 2 and Fig. 7 as an embodiment of the rear footrest swivel link 12 provided with a rear upper pivot point 121, a rear lower pivot point 122 and a central rear pivot point 123 located between the rear upper pivot point 121 and the rear lower pivot point 122. In this embodiment, the seat cushion frame 200 is pivotably connected to the rear upper pivot point 121, the rear footrest connecting link 15 is pivotably connected to the rear lower pivot point 122, and the first intermediate link 13 is further pivotably connected to the central rear pivot point 123, thereby ensuring that the pivot points at which the rear footrest swivel link 12 is connected to the first intermediate link 13 and to the rear footrest connecting link 15 do not coincide.

[0028] Furthermore, in Fig. 2 and Fig. In one embodiment, the front footrest swivel link 11 is further provided with a lower pivot point 114 located below the front lower pivot point 112. The rear footrest connecting link 15 is provided with a rear central pivot point 153 and a rear upper pivot point 154, which is pivotably connected to the rear end 171 of the first long link 17. The second intermediate link 16 is pivotably connected to both the lower pivot point 114 and the rear central pivot point 153. The rear central pivot point 153 lies between the rear lower pivot point 122 of the rear footrest swivel link 12 and the rear upper pivot point 154 of the rear footrest connecting link 15.In these configurations, it is ensured that the sliding speed of the first long link 70, driven by the four-bar linkage formed by the seat cushion frame 200, the front footrest swivel link 11, the rear footrest swivel link 12 and the first intermediate link 13, is greater than the sliding speed of the second long link 18, driven by the said four-bar linkage, thereby achieving the purpose of the first long link 17 sliding relative to the second long link 18.

[0029] As in Fig. 2 and Fig. As shown in Figure 7, in one embodiment the front footrest connecting link 14 is further provided with a front central pivot point 143 and a front upper pivot point 144. The rear end 181 of the second long link 18 is pivotably connected to the front central pivot point 143 of the front footrest connecting link 14, and the first long link 17 is pivotably connected to the front upper pivot point 144 of the front footrest connecting link 14.In these configurations, a compact adjustment between the first long link 17 and the second long link 18 can be achieved, and the sliding of the first long link 17 relative to the second long link 18 in the front-back direction of the seat cushion frame 200 is more reliable during the switching process of the footrest device 10 between the extended position and the retracted position, thus enabling the first long link 17 to drive the support section 191 of the first footrest section 19a to flip between a forward-facing and an upward-facing position.

[0030] The operating principle of the foot support mechanism for furniture 100 of the present application is described with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. 8 described. If the footrest device 10 is in the in Fig. 2 shown retracted position into the in Fig. When the extended position shown in Figure 7 is to be switched, the front footrest swivel arm 11 is caused to pivot upwards counterclockwise around the front upper pivot point 111 of the front footrest swivel arm 11, and the rear footrest swivel arm 12 is caused to pivot upwards counterclockwise around the rear upper pivot point 121 of the rear footrest swivel arm 12. This causes the first intermediate link 13 to move upwards, simultaneously causing the front footrest connecting link 14 to pivot the front lower pivot point 112 of the front footrest swivel link 11 clockwise forwards, causing the rear footrest connecting link 15 to pivot the rear lower pivot point 122 of the rear footrest swivel link 12 clockwise forwards, and causing the second intermediate link 16 to rotate clockwise forwards.Consequently, the first long link 17 and the second long link 18 are caused to slide forward, with the sliding speed of the first long link 17 being greater than that of the second long link 18. Precisely because the first long link 17 and the second long link 18 slide forward, the first foot support section 19a, the second foot support section 19b and the short link 19c rotate counterclockwise upwards.

[0031] When the front footrest swivel link 11 pivots upwards counterclockwise around the front upper pivot point 111 of the front footrest swivel link 11, and the rear footrest swivel link 12 pivots upwards counterclockwise around the rear upper pivot point 121 of the rear footrest swivel link 12 into the Fig. When the position shown in Figure 7 is pivoted, the support section 191 of the first foot support section 19a and the support section 192 of the second foot support section 19b are switched precisely into the upward-facing position, as shown in Figure 7. Fig. 7 shown.

[0032] During the forward sliding process of the first long arm 17 and the second long arm 18, the first long arm 17 slides along the guide structure 20, and the locking structure 30 prevents the first long arm 17 from detaching from the guide structure 20. It should be noted that the process of switching the footrest device 10 from the retracted position to the extended position is exactly the opposite of the process of switching from the extended position to the retracted position, so a detailed description of this is omitted here.

[0033] In contrast to the prior art, in the present application, during the movement of the footrest device 10 between the retracted and extended positions, the locking structure 30 mounted on the seat cushion frame 200 is designed to prevent the footrest device 10 from detaching from the guide structure 20 in the left-right direction and / or the up-down direction of the seat cushion frame 200. Therefore, it is prevented that the footrest device 10 accidentally detaches from the guide structure 20 because an operator lifts the footrest device 10, thus ensuring that the footrest device 10 reliably switches between the retracted and extended positions.

[0034] It should be noted that the direction indicated by arrow A in the drawings is the direction of the seat cushion frame 200 from left to right, the direction indicated by arrow B in the drawings is the direction of the seat cushion frame 200 from top to bottom, and the direction indicated by arrow C in the drawings is the direction of the seat cushion frame 200 from back to front.

[0035] The foregoing descriptions are merely preferred embodiments of the present application and are not intended to limit the scope of protection of the application. Any amendments, equivalent replacements, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

[1] Footrest mechanism for furniture, comprising a footrest device mounted on a seat cushion frame, wherein the footrest device is movable and has a retracted position and an extended position relative to the seat cushion frame, characterized by , that the footrest mechanism for furniture further comprises a guide structure mounted on the seat cushion frame and a locking structure, wherein during the movement between the retracted position and the extended position the guide structure is designed to guide the movement of the footrest device, and the locking structure is designed to prevent the footrest device from detaching from the guide structure in a left-right direction and / or an up-down direction of the seat cushion frame. [2] Footrest mechanism for furniture according to claim 1, wherein the guide structure is provided with a guide groove to guide the movement of the footrest device, wherein the footrest device is inserted into the guide groove from above and is limited in a lateral direction; the locking structure comprises an upper locking structure which is located above the guide groove, and the upper locking structure is designed to prevent the footrest device from moving upwards out of the guide groove. [3] Foot support mechanism for furniture according to claim 2, wherein the guide structure is rotatably mounted on the seat cushion frame, a center line of rotation of the guide structure extends in the left-right direction of the seat cushion frame and the guide groove extends completely circularly around the center line of rotation. [4] Foot support mechanism for furniture according to claim 2, wherein the locking structure further comprises a rear locking structure which is located behind the guide structure, wherein the rear locking structure is also located below the upper locking structure, the rear locking structure is provided with a connecting groove which is connected to the guide groove, and a groove side wall of the connecting groove located away from the seat cushion frame is higher in the longitudinal direction than a groove side wall of the guide groove located away from the seat cushion frame. [5] Foot support mechanism for furniture according to claim 4, wherein a groove side wall of the connecting groove near the seat cushion frame is offset in the left-right direction of the seat cushion frame relative to a groove side wall of the guide groove near the seat cushion frame and the groove side wall of the connecting groove near the seat cushion frame lies between the seat cushion frame and the groove side wall of the guide groove near the seat cushion frame. [6] Footrest mechanism for furniture according to any one of claims 1 to 5, wherein the footrest device comprises a front footrest swivel link, a rear footrest swivel link, a first intermediate link, a front footrest connecting link, a rear footrest connecting link, a second intermediate link, and a first long link and a second long link, each extending in a front-to-back direction of the seat cushion frame; the first intermediate link is located below the seat cushion frame and extends in the front-to-back direction of the seat cushion frame; the front footrest swivel link is pivotably connected to both the seat cushion frame and to a front end of the first intermediate link.the rear footrest swivel link is pivotally connected to both the seat cushion frame and a rear end of the first intermediate link; an upper end of the rear footrest connecting link is pivotally connected to a rear end of the first long link; a lower end of the rear footrest connecting link is pivotally connected to the rear footrest swivel link; a lower end of the front footrest connecting link is pivotally connected to the front footrest swivel link; an upper end of the front footrest connecting link is successively pivotally connected to a rear end of the second long link and the rear end of the first long link; the second intermediate link is pivotally connected to both the rear footrest connecting link and the front footrest swivel link; a front end of the first long link is pivotally connected to a first footrest section.which has a support section, a position of the first footrest section pivotably connected to a second footrest section spaced apart from the first long link, which has a support section, the second footrest section pivotably connected to a short link, and a front end of the second long link is successively pivotably connected to the first footrest section and the short link; the guide structure is designed to allow the first long link to slide along it, and the locking structure is designed to prevent the first long link from detaching from the guide structure in the left-right direction and / or the up-down direction of the seat cushion frame. [7] Footrest mechanism for furniture according to claim 6, wherein, when the footrest device is switched to the retracted position, the support sections of the first footrest section and the second footrest section are arranged such that one is directed forward and one downward, while the first long link and the second long link are also slidably retracted into the seat cushion frame; when the footrest device is switched to the extended position, the support sections of the first footrest section and the second footrest section are arranged directed upward, while the first long link and the second long link are also slidably extended out of the seat cushion frame. [8] Footrest mechanism for furniture according to claim 6, wherein the front footrest swivel link is provided with a front upper pivot point, a front lower pivot point and a central front pivot point located between the front upper pivot point and the front lower pivot point; the seat cushion frame is pivotably connected to the front upper pivot point, the front footrest connecting link is pivotably connected to the front lower pivot point and the first intermediate link is pivotably connected to the central front pivot point; the rear footrest swivel link is provided with a rear upper pivot point, a rear lower pivot point and a central rear pivot point located between the rear upper pivot point and the rear lower pivot point;the seat cushion frame is pivotally connected to the rear upper pivot point, the rear footrest connecting link is pivotally connected to the rear lower pivot point, and the first intermediate link is further pivotally connected to the middle rear pivot point. [9] Footrest mechanism for furniture according to claim 8, wherein the front footrest swivel link is further provided with a lower pivot point located below the front lower pivot point, the rear footrest connecting link is provided with a rear middle pivot point and a rear upper pivot point pivotably connected to the rear end of the first long link, the second intermediate link is pivotably connected to the lower pivot point and the rear middle pivot point, respectively, and the rear middle pivot point is located between the rear lower pivot point of the rear footrest swivel link and the rear upper pivot point of the rear footrest connecting link. [10] Footrest mechanism for furniture according to claim 8, wherein the front footrest connecting link is further provided with a front central pivot point and a front upper pivot point, the rear end of the second long link is pivotably connected to the front central pivot point of the front footrest connecting link and the first long link is pivotably connected to the front upper pivot point of the front footrest connecting link.

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