Footrest mechanism for furniture

Abstract

Footrest mechanism for furniture, mounted on a seat cushion frame and having a retracted position and an extended position relative to the seat cushion frame, wherein the footrest mechanism for furniture comprises a front footrest swivel link, a rear footrest swivel link, a first intermediate link, a rear footrest connecting link and a second intermediate link, wherein the first intermediate link is located below the seat cushion frame and extends in a front-to-rear direction of the seat cushion frame, the front footrest swivel link is pivotally connected to both the seat cushion frame and 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;A lower end of the rear footrest connecting link is pivotally connected to the rear footrest swivel link; the second intermediate link is pivotally connected to both the rear footrest connecting link and the front footrest swivel link; and one of the front footrest swivel link, the second intermediate link, or the rear footrest swivel link is provided with a drive structure powered by an external force mechanism to switch the footrest mechanism for furniture between the retracted position and the extended position. characterized in that the first intermediate link is provided with a first support structure located behind the front footrest swivel link and projecting in a left-right direction of the seat cushion frame, and the second intermediate link is provided with a second support structure for supporting the first support structure; wherein, when the footrest mechanism for furniture is moved into the extended position, the second support structure supports the first support structure from below, while the first support structure also supports the front footrest swivel link.

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] With existing extendable metal frames, the footrest can be extended and retracted relative to the seat cushion frame of the extendable metal frame to meet the requirement that "the footrest can be moved backward relative to the seat cushion frame to move into a retracted position and forward relative to the seat cushion frame to move into an extended position." Because the footrest itself and the connection between the footrest and the seat cushion frame are assembled via pivot joints, the play in the pivot joints gradually increases during prolonged extension and retraction of the footrest relative to the seat cushion frame. It is precisely because of this increasing play that the sagging of the footrest becomes more pronounced when it is moved into the extended position.

[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 foot support mechanism for furniture that prevents severe sagging when switching to an extended position.

[0007] To achieve the aforementioned objective, the present application provides a footrest mechanism for furniture, which is mounted on a seat cushion frame and has a retracted position and an extended position relative to the seat cushion frame, wherein the footrest mechanism for furniture comprises a front footrest pivot link, a rear footrest pivot link, a first intermediate link, a rear footrest connecting link, and a second intermediate link. The first intermediate link is located below the seat cushion frame and extends in a front-to-rear direction of the seat cushion frame; the front footrest pivot link is pivotally connected to both the seat cushion frame and a front end of the first intermediate link; the rear footrest pivot link is pivotally connected to both the seat cushion frame and a rear end of the first intermediate link.A lower end of the rear footrest connecting link is pivotally connected to the rear footrest swivel link; the second intermediate link is pivotally connected to both the rear footrest connecting link and the front footrest swivel link; and one of the front footrest swivel link, the second intermediate link, or the rear footrest swivel link is provided with a drive structure powered by an external force mechanism to switch the footrest mechanism for furniture between the retracted and extended positions. The first intermediate link is provided with a first support structure located behind the front footrest swivel link and projecting in a left-right direction from the seat cushion frame; and the second intermediate link is provided with a second support structure to support the first support structure.wherein, when the footrest mechanism for furniture is moved into the extended position, the second support structure supports the first support structure from below, while the first support structure also supports the front footrest swivel arm.

[0008] In contrast to the prior art, in the present application the first intermediate link is provided with the first support structure, which lies behind the front footrest swivel link and projects forward in the left-right direction of the seat cushion frame, and the second intermediate link is provided with the second support structure for supporting the first support structure, so that when an external force mechanism drives the drive structure, the footrest mechanism for furniture of the present application is driven to move into the extended position, and the second support structure supports the first support structure from below, while the first support structure also supports the front footrest swivel link.In this way, the problem of excessive sagging caused by increased play in the pivot joints can be eliminated, i.e., it prevents the footrest mechanism from sagging excessively relative to the seat cushion frame 200 when it is moved into the extended position.

[0009] Preferably, the first support structure is located between the front end and the rear end of the first intermediate link; the first support structure has a circular cross-section, and the second support structure has a flat support surface that is tangentially connected to the first support structure.

[0010] Preferably, when the footrest mechanism for furniture is moved into the retracted position, the second support structure is located behind the first support structure, while the first support structure is also spaced apart from the front footrest swivel link; the second support structure projects from an upper surface of the second intermediate link, and the first support structure projects from the first intermediate link in a direction away from the seat cushion frame.

[0011] Preferably, the footrest mechanism further comprises a front footrest connecting link and a first long link and a second long link, each extending in the front-to-rear direction of the seat cushion frame; wherein a lower end of the front footrest connecting link is pivotably connected to the front footrest swivel link, an upper end of the front footrest connecting link is successively pivotably connected to a rear end of the second long link and a rear end of the first long link, and an upper end of the rear footrest connecting link is pivotably connected to the rear end of the first long 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 spaced apart from the first long link is pivotally connected to a second footrest section which has a further support section; the second footrest section is pivotally connected to a short link; and a front end of the second long link is successively pivotally connected to the first footrest section and the short link.

[0012] Preferably, when the footrest mechanism for furniture 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 mechanism for furniture is switched to the extended position, the support sections of the first footrest section and the second footrest section are arranged facing upward, while the first long link and the second long link are also slidably extended out of the seat cushion frame.

[0013] 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; the drive structure on the front footrest pivot linkage is adjacent to a front face of the front lower pivot point.

[0014] Preferably, the front footrest swivel link is further provided with a lower pivot point located below the front lower pivot point, and the drive structure on the front footrest swivel link is further located adjacent to a front face of the 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, respectively, the rear middle pivot point being 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;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.

[0015] Preferably, the foot support mechanism further comprises a guide structure mounted on the seat cushion frame for sliding guidance of the first long link and a locking structure to prevent the first long link from detaching from the guide structure in the left-right direction and / or an up-down direction of the seat cushion frame.

[0016] Preferably, the guide structure is provided with a guide groove to receive the first long link in a sliding manner, wherein the first long link 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, thereby preventing the first long link from moving upwards out of the guide groove.

[0017] 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;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 which is connected to the guide groove, a groove side wall of the connecting groove furthest from the seat cushion frame is longitudinally higher than a groove side wall of the guide groove furthest from the seat cushion frame, 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. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of the foot support mechanism for furniture according to the present application, mounted on a seat cushion frame and in a retracted position. Fig. 2 is a top view of Fig. 1, viewed from the direction opposite to the direction of arrow B. Fig. 3 is a perspective view of Fig. 1 from a different angle. Fig. 4 is an exploded view of Fig. 3. Fig. Figure 5 is a perspective view of the foot support mechanism for furniture according to the present application, mounted on a seat cushion frame and in an extended position. Fig. 6 is a top view of Fig. 5, viewed from the direction opposite to arrow B. Fig. Figure 7 is an enlarged view of section D in Fig. 6. Fig. Figure 8 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. 9 is a top view of Fig. 8, viewed in the direction of arrow A. 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. 5 and Fig. 6. The footrest mechanism for furniture 100 of the present application is mounted on a seat cushion frame 200, which provides a mounting point and support for the footrest mechanism 100. At the same time, the footrest mechanism 100 of the present application is recessed, at least relative to the seat cushion frame 200, into a Fig. 1, Fig. 2 or Fig. 3 shown retracted position or relative to the seat cushion frame 200 forward into a position that Fig. 5 or Fig. The extended position shown in section 6 is movable to meet user requirements. For example, if a user wishes to rest their feet, the footrest mechanism 100 is moved forward relative to the seat cushion frame 200 into the position shown. Fig. 5 or Fig. The extended position shown in section 6 moves and thus extends forward out of the seat cushion frame 200 to provide the footrest. When the footrest is not needed, the footrest mechanism 100 is moved backward relative to the seat cushion frame 200 into the position shown in section 6. Fig. 1, Fig. 2 or Fig. 3 shown retracted position moved and thereby retracted back towards the seat cushion frame 200 into a stowed state.

[0020] The footrest mechanism of the present application comprises a front footrest pivot link 10, a rear footrest pivot link 20, a first intermediate link 30, a rear footrest connecting link 40, and a second intermediate link 50. The first intermediate link 30 is located below the seat cushion frame 200 and extends in a front-to-rear direction of the seat cushion frame 200, as shown in Fig. 2 or Fig. Figure 6 shows that the front footrest swivel link 10 is pivotally connected to both the seat cushion frame 200 and a front end 31 of the first intermediate link 30. The rear footrest swivel link 20 is pivotally connected to both the seat cushion frame 200 and a rear end 32 of the first intermediate link 30. The first intermediate link 30 is provided with a first support structure 33, which is located behind the front footrest swivel link 10 and projects in a left-right direction from the seat cushion frame 200. Optionally, a support structure 33 is located in the seat cushion frame 200. Fig. 2 and Fig. 6 as one embodiment, the first support structure 33 is located between the front end 31 and the rear end 32 of the first intermediate link 30, thereby increasing the support strength of the first support structure 33 for the front footrest swivel link 10. Obviously, the first support structure 33 could also be arranged at other suitable positions on the first intermediate link 30, depending on the actual requirements, which is not to be confused with the one in Figure 6. Fig. 2 and Fig. The number of images shown is limited to 6.

[0021] As in Fig. 2 and Fig. As shown in Figure 6, a lower end 41 of the rear footrest connecting link 40 is pivotally connected to the rear footrest swivel link 20. The second intermediate link 50 is pivotally connected to both the rear footrest connecting link 40 and the front footrest swivel link 10. The second intermediate link 50 is provided with a second support structure 51 for supporting the first support structure 33. Optionally, in Fig. 7 as one embodiment, the second support structure 51 is designed to project from an upper surface 52 of the second intermediate link 50, so that the second support structure 51 on the second intermediate link 50 can better support the first support structure 33 on the first intermediate link 30. Obviously, the second support structure 51 could also be arranged at other suitable positions on the second intermediate link 50 according to the actual requirements, which is not to be confused with the one in Fig. The number of images shown is limited to 7.

[0022] Again with reference to Fig. 2 and Fig. 6 The front footrest swivel linkage 10 is provided with a drive structure 50' which is actuated by an external force mechanism (such as a cylinder, hydraulic cylinder, linear motor, etc.), thereby pivoting the footrest mechanism of the present application between the in Fig. 2 shown in the retracted position and the one in Fig. The footrest mechanism is switched to the extended position shown in section 6. Fig. When the extended position shown in Figure 6 is moved, the second support structure 51 supports the first support structure 33 from below, while the first support structure 33 also supports the front footrest swivel arm 10, as shown in Figure 6. Fig. Figure 7 shows that when the footrest mechanism for furniture 100 of the present application is driven into the extended position by the external force mechanism via the drive structure 50', the front footrest pivot link 10, the first intermediate link 30, and the second intermediate link 50 are held in a tightly fitting, load-bearing state via the second support structure 51 and the first support structure 33, thus preventing the footrest mechanism for furniture 100 from sagging excessively in the extended position. It should be noted that, although Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. 6 the drive structure 50' on the front footrest swivel link 10, which could obviously also be provided on the second intermediate link 50 or the rear footrest swivel link 20, depending on the actual requirements. Furthermore, in Fig. 1, Fig. 3 and Fig. 4 As one embodiment, the drive structure 50' is a plate-like structure that is curved relative to the front footrest swivel link 10. Obviously, the drive structure 50' could also have other shapes.

[0023] More precisely, as in Fig. Figure 7 shows that the first support structure 33 has a circular cross-section, and the second support structure 51 has a flat support surface 511 that is tangential to the first support structure 33. In such configurations, the support between the second support structure 51 and the first support structure 33 is improved when the footrest mechanism for furniture 100 of the present application is switched to the extended position, thereby ensuring the reliability of the support provided by the second support structure 51 for the first support structure 33 and also ensuring the support effect of the first support structure 33 on the front footrest swivel link 10. Furthermore, in Fig. 2 as an embodiment, when the footrest mechanism for furniture 100 of the present application is moved into the retracted position, the second support structure 51 is arranged accordingly behind the first support structure 33, while the first support structure 33 is also spaced apart from the front footrest swivel link 10, as in Fig. 2 shown. Additionally, it protrudes into Fig. 1 as one embodiment the first support structure 33 extends from the first intermediate link 30 in a direction away from the seat cushion frame 200 to facilitate the process in which the first support structure 33 is supported by the second support structure 51 on the second intermediate link 50.

[0024] As in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. As shown in Figure 6, in one embodiment the footrest mechanism for furniture 100 of the present application further comprises a front footrest connecting link 60 as well as a first long link 70 and a second long link 80, each extending in the front-to-back direction of the seat cushion frame 200. Optionally, in Fig. 2 and Fig. 6 the first long link 70 is longer than the second long link 80, and the first long link 70 is also spaced apart from the second long link 80 in the left-right direction of the seat cushion frame 200, such that the first long link 70 lies between the seat cushion frame 200 and the second long link 80, as shown in Fig. Figure 1 shows that a lower end 61 of the front footrest connecting link 60 is pivotably connected to the front footrest swivel link 10. An upper end 62 of the front footrest connecting link 60 is successively pivotably connected to a rear end 81 of the second long link 80 and a rear end 71 of the first long link 70, as shown in Figure 1. Fig. Figure 6 shows that an upper end 42 of the rear footrest connecting link 40 is pivotally connected to the rear end 71 of the first long link 70, such that the speed at which the combination of the second intermediate link 50 and the rear footrest connecting link 40 drives the first long link 70 is greater than the speed at which the front footrest connecting link 60 drives the second long link 80, thereby generating a speed difference between the first long link 70 and the second long link 80. A front end 72 of the first long link 70 is pivotally connected to a first footrest section 90a, which has a support section 91. A position of the first footrest section 90a spaced apart from the first long link 70 is pivotally connected to a second footrest section 90b, which has a support section 92. The second footrest section 90b is pivotally connected to a short linkage 90c.A front end 82 of the second long link 80 is successively pivotable to the first foot support section 90a and the short link 90c.

[0025] If the footrest mechanism for furniture 100 of the present application is incorporated into the Fig. When the retracted position shown in Figure 2 is switched, the support sections 91, 92 of the first footrest section 90a and the second footrest section 90b are arranged such that one is directed forward and one downward, while the first long link 70 and the second long link 80 are also slidably retracted into the seat cushion frame 200, as shown in Figure 2. Fig. 2 shown, to prevent the first footrest section 90a and the second footrest section 90b from protruding outwards from the seat cushion frame 200 in this position. When the footrest mechanism for furniture 100 of the present application is inserted into the Fig. When the extended position shown in Figure 6 is switched, the support sections 91, 92 of the first footrest section 90a and the second footrest section 90b are arranged facing upwards, while the first long link 70 and the second long link 80 are also extended slidingly from the seat cushion frame 200 to meet the user's need for the footrest.

[0026] Furthermore, as in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. Figure 6 shows that in one embodiment, the front footrest swivel link 10 is provided with a front upper pivot point 11, a front lower pivot point 12, and a central front pivot point 13 located between the front upper pivot point 11 and the front lower pivot point 12. The seat cushion frame 200 is pivotably connected to the front upper pivot point 11, the front footrest connecting link 60 is pivotably connected to the front lower pivot point 12, and the first intermediate link 30 is pivotably connected to the central front pivot point 13. This ensures that the pivot points at which the front footrest swivel link 10 is connected to the first intermediate link 30 and to the front footrest connecting link 60 do not coincide. Additionally, in Fig. 2 and Fig. 6 in one embodiment the rear footrest pivot link 20 is provided with a rear upper pivot point 21, a rear lower pivot point 22 and a central rear pivot point 23 located between the rear upper pivot point 21 and the rear lower pivot point 22. Here, the seat cushion frame 200 is pivotally connected to the rear upper pivot point 21, the rear footrest connecting link 40 is pivotally connected to the rear lower pivot point 22, the first intermediate link 30 is further pivotally connected to the middle rear pivot point 23, and the drive structure 50' on the front footrest swivel link 10 is adjacent to a front face of the front lower pivot point 12. On the one hand, this ensures that the pivot points at which the rear footrest swivel link 20 is connected to the first intermediate link 30 and to the rear footrest connecting link 40 do not coincide.On the other hand, this facilitates the process by which the external force mechanism switches the foot support mechanism for furniture 100 of the present application between the retracted and extended positions via the drive structure 50'.

[0027] Furthermore, in Fig. 2 and Fig. 6 In one embodiment, the front footrest swivel link 10 is further provided with a lower pivot point 14 located below the front lower pivot point 12, and the drive structure 50' on the front footrest swivel link 10 is further located adjacent to a front face of the lower pivot point 14. The rear footrest connecting link 40 is provided with a rear central pivot point 43 and a rear upper pivot point 44, which is pivotably connected to the rear end 71 of the first long link 70. The second intermediate link 50 is pivotably connected to both the lower pivot point 14 and the rear central pivot point 43. The rear central pivot point 43 lies between the rear lower pivot point 22 of the rear footrest swivel link 20 and the rear upper pivot point 44 of the rear footrest connecting link 40.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 10, the rear footrest swivel link 20 and the first intermediate link 30, is greater than the sliding speed of the second long link 80, driven by the said four-bar linkage, thereby achieving the purpose of the first long link 70 sliding relative to the second long link 80.

[0028] As in Fig. 2 and Fig. As shown in Figure 6, in one embodiment the front footrest connecting link 60 is further provided with a front central pivot point 63 and a front upper pivot point 64. The rear end 81 of the second long link 80 is pivotably connected to the front central pivot point 63 of the front footrest connecting link 60, and the first long link 70 is pivotably connected to the front upper pivot point 64 of the front footrest connecting link 60.In these configurations, a compact adjustment between the first long link 70 and the second long link 80 can be achieved, and the sliding of the first long link 7 relative to the second long link 80 in the front-back direction of the seat cushion frame 200 is more reliable during the switching process of the footrest mechanism for furniture 100 between the extended position and the retracted position, thus enabling the first long link 70 to drive the support section 91 of the first footrest section 90a to flip between a forward-facing and an upward-facing position.

[0029] With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. In one embodiment, the footrest mechanism for furniture 100 of the present application further comprises a guide structure 90d mounted on the seat cushion frame 200 for slidingly guiding the first long link 70 and a locking structure 90e to prevent the first long link 70 from detaching from the guide structure 90d in a left-right direction and / or an up-down direction of the seat cushion frame 200. This prevents an operator from accidentally detaching the footrest mechanism for furniture 100 from the guide structure 90d by lifting it upwards, thus ensuring reliable switching of the footrest mechanism for furniture 100 of the present application between the retracted and extended positions.

[0030] Specifically, in Fig. 3 and Fig. 4 In one embodiment, the guide structure 90d is provided with a guide groove 93 to slidably receive the first long link 70. The first long link 70 is inserted into the guide groove 93 from above and is laterally limited, as shown in Fig. Figure 4 shows that the first long link 70, arranged within the guide groove 93, is limited in the left-right direction by the guide structure 90d and cannot slide laterally, thus improving the reliability of the sliding of the first long link 70 along the guide structure 90d. The locking structure 90e includes an upper locking structure 94, which is located above the guide groove 93. The upper locking structure 94 prevents the first long link 70 from moving upwards out of the guide groove 93. Thus, the interaction of the guide groove 93 and the upper locking structure 94 achieves the purpose of preventing the first long link 70 from detaching from the guide structure 90d in the up-down and left-right directions of the seat cushion frame 200.

[0031] More precisely, in Fig. 8 and Fig. 9 In one embodiment, the guide structure 90d is rotatably mounted on the seat cushion frame 200. A rotation centerline 933 of the guide structure 90d extends in the left-right direction of the seat cushion frame 200. The guide groove 93 extends completely circularly around the rotation centerline 933. This configuration can effectively reduce the frictional resistance of the first long link 70 when sliding along the guide structure 90d, thereby making the sliding of the first long link 70 along the guide structure 90d more flexible and smoother. Furthermore, in Fig. 8 and Fig. 9 In one embodiment, the locking structure 90e further comprises a rear locking structure 95, which is located behind the guide structure 90d. The rear locking structure 95 is also located below the upper locking structure 94. The rear locking structure 95 is provided with a connecting groove 951, which is connected to the guide groove 93. A groove side wall 9511 of the connecting groove 951, located furthest from the seat cushion frame 200, is longitudinally higher than a groove side wall 931 of the guide groove 93, also located furthest from the seat cushion frame 200. These configurations effectively prevent the first long link 70 from disengaging from the guide structure 90d in the left-right direction of the seat cushion frame 200. For example, in Fig. 8 and Fig. In one embodiment, a groove side wall 9512 of the connecting groove 951, located near the seat cushion frame 200, is offset in the left-right direction of the seat cushion frame 200 relative to a groove side wall 932 of the guide groove 93, also located near the seat cushion frame 200. The groove side wall 9512 of the connecting groove 951, located near the seat cushion frame 200, lies between the seat cushion frame 200 and the groove side wall 932 of the guide groove 93, which is located near the seat cushion frame 200. This configuration can prevent the groove side wall 9512 of the connecting groove 951, located near the seat cushion frame 200, from coming into contact with the first long link 70, thereby effectively reducing the frictional resistance during the sliding of the first long link 70.

[0032] 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 mechanism for furniture 100 in the in Fig. 2 shown retracted position into the in Fig. To switch to the extended position shown in 6, the external force mechanism, via the drive structure 50', causes the front footrest swivel arm 10 to pivot upwards counterclockwise about the front upper pivot point 11 of the front footrest swivel arm 10, and causes the rear footrest swivel arm 20 to pivot upwards counterclockwise about the rear upper pivot point 21 of the rear footrest swivel arm 20.This causes the first intermediate link 30 to move upwards, while simultaneously causing the front footrest connecting link 60 to pivot the front lower pivot point 12 of the front footrest swivel link 10 clockwise forwards, the rear footrest connecting link 40 to pivot the rear lower pivot point 22 of the rear footrest swivel link 20 clockwise forwards, and the second intermediate link 50 to rotate clockwise forwards. As a result, the second support structure 51, the first support structure 33, and the front footrest swivel link 10 move closer together, while at the same time the first long link 70 and the second long link 80 are caused to slide forwards, with the sliding speed of the first long link 70 being greater than that of the second long link 80.Precisely because the first long link 70 and the second long link 80 slide forward, the first foot support section 90a, the second foot support section 90b and the short link 90c rotate counterclockwise upwards.

[0033] When the front footrest swivel arm 10 pivots upwards counterclockwise around the front upper pivot point 11 of the front footrest swivel arm 10 and the rear footrest swivel arm 20 pivots upwards counterclockwise around the rear upper pivot point 21 of the rear footrest swivel arm 20 into the in Fig. When the position shown in Figure 6 is pivoted, the support section 91 of the first footrest section 90a and the support section 92 of the second footrest section 90b are switched precisely into the upward-facing position. At this point, the second support structure 51 supports the first support structure 33, and the first support structure 33 supports the front footrest pivot link 10, as shown in Figure 6. Fig. 6 and Fig.7 shown.

[0034] During the forward sliding process of the first long arm 70 and the second long arm 80, the first long arm 70 slides along the guide structure 90d, and the locking structure 90e prevents the first long arm 70 from detaching from the guide structure 90d. It should be noted that the process of switching the footrest mechanism for furniture 100 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.

[0035] In comparison to the prior art, in the present application the first intermediate link 30 is provided with the first support structure 33, which is located behind the front footrest swivel link 10 and projects forward in the left-right direction of the seat cushion frame 200, and the second intermediate link 50 is provided with the second support structure 51 for supporting the first support structure 33, so that when an external force mechanism drives the drive structure 50', the footrest mechanism for furniture 100 of the present application is driven to move into the extended position, and the second support structure 51 supports the first support structure 33 from below, while the first support structure 33 also supports the front footrest swivel link 10.In this way, the problem of excessive sagging caused by increased play in the pivot joints can be eliminated, i.e., it prevents the footrest mechanism from sagging excessively relative to the seat cushion frame 200 when it is moved into the extended position.

[0036] It should be noted that the direction indicated by arrow A in the drawings is the direction of the seat cushion frame 200 from back to front, the direction indicated by arrow B in the drawings is the direction of the seat cushion frame 200 from left to right, and the direction indicated by arrow C in the drawings is the direction of the seat cushion frame 200 from top to bottom.

[0037] 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, mounted on a seat cushion frame and having a retracted position and an extended position relative to the seat cushion frame, the footrest mechanism for furniture comprising a front footrest swivel link, a rear footrest swivel link, a first intermediate link, a rear footrest connecting link and a second intermediate link, wherein the first intermediate link is located below the seat cushion frame and extends in a front-to-rear direction of the seat cushion frame, the front footrest swivel link is pivotally connected to both the seat cushion frame and 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;a lower end of the rear footrest connecting link is pivotally connected to the rear footrest swivel link, the second intermediate link is pivotally connected to both the rear footrest connecting link and the front footrest swivel link, and one of the front footrest swivel link, the second intermediate link or the rear footrest swivel link is provided with a drive structure driven by an external force mechanism to switch the footrest mechanism for furniture between the retracted position and the extended position; characterized by, that the first intermediate link is provided with a first support structure located behind the front footrest swivel link and projecting in a left-right direction of the seat cushion frame, and the second intermediate link is provided with a second support structure to support the first support structure; wherein, when the furniture footrest mechanism is moved into the extended position, the second support structure supports the first support structure from below, while the first support structure also supports the front footrest swivel link. [2] Foot support mechanism for furniture according to claim 1, wherein the first support structure is located between the front end and the rear end of the first intermediate link; the first support structure has a circular cross-section and the second support structure has a flat support surface that is tangentially connected to the first support structure. [3] Footrest mechanism for furniture according to claim 1, wherein when the footrest mechanism for furniture is moved into the retracted position, the second support structure is located behind the first support structure, while the first support structure is also spaced apart from the front footrest pivot link; the second support structure projects on an upper surface of the second intermediate link and the first support structure projects from the first intermediate link in a direction away from the seat cushion frame. [4] Footrest mechanism for furniture according to any one of claims 1 to 3, further comprising a front footrest connecting link and a first long link and a second long link, each extending in the front-to-back direction of the seat cushion frame; wherein a lower end of the front footrest connecting link is pivotably connected to the front footrest swivel link, an upper end of the front footrest connecting link is successively pivotably connected to a rear end of the second long link and a rear end of the first long link, and an upper end of the rear footrest connecting link is pivotably connected to the rear end of the first long 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 spaced apart from the first long link is pivotally connected to a second footrest section which has a further support section; the second footrest section is pivotally connected to a short link; and a front end of the second long link is successively pivotally connected to the first footrest section and the short link. [5] Footrest mechanism for furniture according to claim 4, wherein, when the footrest mechanism for furniture 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 mechanism for furniture is switched to the extended position, the support sections of the first footrest section and the second footrest section are arranged to point upward, while the first long link and the second long link are also slidably extended out of the seat cushion frame. [6] Footrest mechanism for furniture according to claim 4, 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 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; the drive structure on the front footrest pivot linkage is adjacent to a front face of the front lower pivot point. [7] Footrest mechanism for furniture according to claim 6, wherein the front footrest swivel link is further provided with a lower pivot point located below the front lower pivot point, and the drive structure on the front footrest swivel link is further located adjacent to a front face of the 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 pivotably connected to the lower pivot point and the rear middle pivot point respectively, wherein 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;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. [8] Foot support mechanism for furniture according to claim 4, further comprising a guide structure mounted on the seat cushion frame for sliding the first long link and a locking structure to prevent the first long link from detaching from the guide structure in the left-right direction and / or an up-down direction of the seat cushion frame. [9] Foot support mechanism for furniture according to claim 8, wherein the guide structure is provided with a guide groove to receive the first long link in a sliding manner, wherein the first long link 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, thereby preventing the first long link from moving upwards out of the guide groove. [10] Foot support mechanism for furniture according to claim 9, 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;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, a groove side wall of the connecting groove furthest from the seat cushion frame is longitudinally higher than a groove side wall of the guide groove furthest from the seat cushion frame, 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.

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