A sofa frame and seat unit

Abstract

The application provides a sofa support and a seat unit, wherein the sofa support comprises a first driving link hinged to a mounting frame and a supporting link; further comprising a first extension link, a second extension link and a main ottoman link, one end of the first extension link being hinged to a free end of the supporting link, and the first extension link being hinged to the main ottoman link; one end of the second extension link being hinged to the main ottoman link, the hinging point being a second hinging point, and the hinging point between the second extension link and the supporting link being a third hinging point; when the first driving link rotates around the hinging point thereof and the mounting frame, a link section of the first extension link between the second hinging point and the third hinging point is defined as a main link section, and when observing the first extension link from the outside of the second extension link along the rotation axis of the first driving link, the upper edge of the main link section can be shielded by the second extension link. The application can prevent the second extension link and the first extension link from causing injury to users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sofa support, in particular to a sofa support and a seat unit. BACKGROUND

[0002] The functional sofa refers to the sofa with multiple functions, which can realize the deformation of the sofa through special structural design to meet the needs of users sitting, lying or massage, etc. In the use process, in order to provide support for the lower limbs of the user, the support of the functional sofa generally includes a leg stretching assembly and a mounting frame. The existing leg stretching assembly is mostly a planar four-bar mechanism, which is simple in structure and convenient to assemble, but the gap between the opposite sides of the structure is easy to pinch the user during the posture adjustment process; and the structure that can provide support for the user has limited support area, and blindly increasing the support surface will lead to the increase of the volume of the leg stretching assembly, and the space between the leg stretching assembly and the ground after storage becomes smaller, so that the user is difficult to clean the ground in this area. SUMMARY

[0003] In view of the deficiencies of the prior art, the first object of the present application is to provide a sofa support, which can shield the first extension link from the user during use to prevent pinching the user.

[0004] Another object of the present application is to provide a seat unit, which can provide support for the feet or lower legs of the user and is convenient to use.

[0005] The embodiments of the present application are realized by the following technical solutions:

[0006] A sofa support frame, comprising a leg stretching assembly and a mounting frame connected to each other, the leg stretching assembly comprising a first driving link and a supporting link hinged to the mounting frame; further comprising a first extension link, a second extension link, a main ottoman link, a sub-ottoman link and a second driving link, wherein: one end of the first extension link is hinged to a free end of the supporting link at a first hinge point, the other end of the first extension link is hinged to the second driving link, and the first extension link is hinged to the main ottoman link; one end of the sub-ottoman link is hinged to the main ottoman link, and a free end of the second driving link is hinged to the sub-ottoman link; one end of the second extension link is hinged to the main ottoman link at a second hinge point, and the other end of the second extension link is hinged to a free end of the first driving link; the second extension link and the supporting link are hinged at both ends thereof at a third hinge point; when the first driving link rotates about the hinge point thereof with the mounting frame, a main link segment of the first extension link between the second hinge point and the third hinge point is defined, and an upper edge of the main link segment can be blocked by the second extension link when viewed from an outer side of the second extension link along an axis of the first driving link towards the first extension link.

[0007] According to a preferred embodiment, the hinge point of the first extension link and the main ottoman link is a fifth hinge point, the hinge point of the sub-ottoman link and the main ottoman link is a fourth hinge point; the second hinge point, the fifth hinge point and the fourth hinge point are not collinear.

[0008] According to a preferred embodiment, a limiting protrusion is arranged on the second extension link; a receiving notch and an extending notch are arranged on the supporting link and cooperate with the limiting protrusion; when the first driving link rotates, the receiving notch is used to limit the limiting protrusion so that the leg stretching assembly is in a receiving state, and the extending notch is used to limit the limiting protrusion so that the leg stretching assembly is in an extending state.

[0009] According to a preferred embodiment, a first assembly surface is arranged on the main ottoman link, and a second assembly surface is arranged on the sub-ottoman link; when the leg stretching assembly is in the receiving state, the first assembly surface and the second assembly surface form a first included angle; when the leg stretching assembly is in the extending state, the first assembly surface and the second assembly surface form a second included angle.

[0010] According to a preferred embodiment, the hinge point of the first driving link and the second extension link is a sixth hinge point, the limiting protrusion is distributed between the third hinge point and the sixth hinge point; the receiving notch and the extending notch are both arranged towards the limiting protrusion.

[0011] According to a preferred embodiment, the second extension link comprises a lower working section and an upper working section connected to each other, the lower working section is connected to the first driving link, and the upper working section is connected to the main ottoman link; a first transition fillet is arranged at the connection between the lower working section and the upper working section, and the first transition fillet is distributed on the side close to the first hinge point; and the first transition fillet is arranged protruding towards the first hinge point.

[0012] According to a preferred embodiment, the third hinge point and the sixth hinge point are both arranged on the lower working section.

[0013] According to a preferred embodiment, the first extension link comprises a front working section, a middle working section and a rear working section connected to each other in sequence, wherein: the rear working section is connected to the support link; and a second transition fillet is arranged at the connection between the rear working section and the middle working section, and the second transition fillet is arranged protruding away from the first hinge point.

[0014] According to a preferred embodiment, the front working section comprises a working part and a transition part connected to each other, the transition part is connected to the middle working section, and the working part is connected to the second driving link; and the working part is parallel to the middle working section but not coplanar with the middle working section.

[0015] According to a preferred embodiment, the hinge point between the support link and the mounting frame is a seventh hinge point; a reference axis is defined as the rotation axis of the first driving link when the first driving link rotates around the hinge point of the mounting frame, and a reference plane is perpendicular to the reference axis; and the distance between the projection point of the first hinge point in the reference plane and the projection point of the seventh hinge point in the reference plane is 200-240 mm.

[0016] According to a preferred embodiment, the mounting frame comprises a seat frame and an adjusting assembly for adjusting the seat frame, wherein: the adjusting assembly comprises a fixed base plate, a rotary driving plate and an adjusting mechanism arranged oppositely, the rotary driving plate is adjustably connected to the fixed base plate through the adjusting mechanism; the rotary driving plate is adjustably connected to the seat frame through at least two first connecting members, one end of the first connecting member is hingedly connected to the seat frame, and the other end is hingedly connected to the rotary driving plate.

[0017] According to a preferred embodiment, the hinge point between the first connecting member and the seat frame is an eighth hinge point, and the hinge point between the first connecting member and the rotary driving plate is a ninth hinge point; the distance between the projection point of the eighth hinge point in the reference plane and the projection point of the ninth hinge point in the reference plane on the same first connecting member is 110-150 mm.

[0018] According to a preferred embodiment, the adjusting mechanism comprises a second connecting piece, a third connecting piece, a fourth connecting piece, a fifth connecting piece, a sixth connecting piece, a seventh connecting piece and an eighth connecting piece, wherein: the second connecting piece is provided with a first hinging hole and a second hinging hole, the second connecting piece is hinged to the rotating driving plate through the first hinging hole, the second connecting piece is hinged to the third connecting piece through the second hinging hole, and the second hinging hole is between the two ends of the third connecting piece; the first end of the third connecting piece is hinged to the fixed base plate, and the second end is hinged to the first end of the fourth connecting piece; the second end of the fourth connecting piece is hinged to the fifth connecting piece, and the hinging points of the two are between the two ends of the fifth connecting piece; the first end of the fifth connecting piece is hinged to the second connecting piece, and the hinging points of the two are between the first hinging hole and the second hinging hole, and the second end of the fifth connecting piece is hinged to the first end of the sixth connecting piece; the second end of the sixth connecting piece is hinged to the fixed base plate; the first end of the seventh connecting piece is hinged to the sixth connecting piece, and the hinging points of the two are between the two ends of the sixth connecting piece, and the second end of the seventh connecting piece is hinged to the rotating driving plate; the first end of the eighth connecting piece is hinged to the rotating driving plate, and the second end is hinged to the first driving connecting rod.

[0019] According to a preferred embodiment, the seat frame is provided with a backrest assembly, the backrest assembly comprises a backrest connecting block, a backrest limiting block, a backrest limiting rod, a ninth connecting piece, the backrest connecting block is hinged to the backrest limiting block, one end of the ninth connecting piece is hinged to between the two end points of the backrest connecting block, and the other end is hinged to the backrest limiting rod, the backrest limiting rod is provided with a limiting column, and the backrest limiting block is provided with a limiting surface matched with the limiting column; the backrest limiting block is fixedly connected to the seat frame.

[0020] According to a preferred embodiment, the backrest assembly further comprises a tenth connecting piece, the first end of the tenth connecting piece is hinged to the fixed base plate, and the hinging point of the two is the tenth hinging point; the second end of the tenth connecting piece is hinged to one end of the backrest limiting rod away from the backrest connecting block, and the hinging point of the two is the eleventh hinging point; the distance between the projection point of the tenth hinging point in the reference surface and the projection point of the eleventh hinging point in the reference surface is 65-100mm.

[0021] A seat unit comprises the sofa support described above.

[0022] The technical scheme of the embodiment of the application has at least the following advantages and beneficial effects:

[0023] The sofa support provided by this invention, through the structural design of the first and second extension links, ensures that the upper edge of the main link segment (the section between the second and third hinge points) of the first extension link coincides with the second extension link along the rotation axis of the first drive link. That is, when viewed from the outside of the second extension link along the rotation axis of the first drive link towards the first extension link, the upper edge of the main link segment is obscured by the second extension link. This prevents the gap between the first and second extension links from causing pinching injuries to the user during leg extension component posture adjustment. The second extension link, as a component of the leg extension assembly, serves both a structural support and a safety protection function. It eliminates the need for additional anti-pinch components, ensuring safety while simplifying the sofa frame's structure. Furthermore, by incorporating the second drive link and the auxiliary footstool link, the auxiliary footstool link provides functional support to the user, complementing the main footstool link's support. In other words, the auxiliary footstool link provides support to the user just like the main footstool link. This auxiliary footstool link is retractable, compact, and occupies minimal space. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural diagram of the leg extension component provided in an embodiment of the present invention;

[0026] Figure 2 This is a front view of the leg extension component in an extended state according to an embodiment of the present invention.

[0027] Figure 3 A front view of the leg extension component in a stowed state according to an embodiment of the present invention;

[0028] Figure 4 A three-dimensional structural schematic diagram of the second extension link provided in an embodiment of the present invention;

[0029] Figure 5 A three-dimensional structural schematic diagram of the first extension link provided in an embodiment of the present invention;

[0030] Figure 6 A top view of the first extension link provided in an embodiment of the present invention;

[0031] Figure 7A perspective view of the support connecting rod according to an embodiment of the present application is shown in FIG. 1.

[0032] Figure 8 A perspective view of the sofa support in a storage state according to an embodiment of the present application is shown in FIG. 2.

[0033] Figure 9 A perspective view of the sofa support in a half-extended state according to an embodiment of the present application is shown in FIG. 3.

[0034] Figure 10 A perspective view of the sofa support in an extended state according to an embodiment of the present application is shown in FIG. 4.

[0035] Figure 11 A front view of the sofa support in an extended state according to an embodiment of the present application is shown in FIG. 5.

[0036] Figure 12 A rear view of the sofa support in an extended state according to an embodiment of the present application is shown in FIG. 6.

[0037] Figure 13 A front view of the first connecting member according to an embodiment of the present application is shown in FIG. 7.

[0038] Figure 14 A front view of the tenth connecting member according to an embodiment of the present application is shown in FIG. 8.

[0039] Figure 15 A perspective view of the sofa support after the first driving member is assembled according to an embodiment of the present application is shown in FIG. 9.

[0040] Figure 16 A front view of the sofa support relative to the ground after the sofa support is assembled to the seat unit according to an embodiment of the present application is shown in FIG. 10.

[0041] Figure 17 A front view of the sofa support in a lying state according to an embodiment of the present application is shown in FIG. 11.

[0042] Icon: 1, leg stretching assembly; 11, first driving link; 12, supporting link; 121, stretching gap; 122, storage gap; 123, hinged hole three; 124, hinged hole four; 13, second extending link; 131, upper working section; 132, lower working section; 133, first transition round corner; 14, main ottoman link; 141, first assembly surface; 15, first extending link; 151, rear working section; 152, middle working section; 153, front working section; 1531, transition part; 1532, working part; 154, second transition round corner; 16, second driving link; 17, auxiliary ottoman link; 171, second assembly surface; 18, limiting protrusion; 191, first hinged point; 192, sixth hinged point; 193, third hinged point; 194, second hinged point; 195, fourth hinged point; 196, fifth hinged point; 197, seventh hinged point; a, first included angle; b, second included angle; 2, mounting frame; 201, fixed base plate; 202, rotary driving plate; 21, seat frame; 22, first connecting piece; 221, hinged hole five; 222, hinged hole six; 23, second connecting piece; 231, hinged hole one; 24, third connecting piece; 25, fourth connecting piece; 26, fifth connecting piece; 27, sixth connecting piece; 28, seventh connecting piece; 29, eighth connecting piece; 3, backrest assembly; 31, backrest connecting block; 32, backrest limiting block; 321, limiting surface; 33, backrest limiting rod; 331, limiting column; 34, tenth connecting piece; 341, hinged hole seven; 342, hinged hole eight; 35, ninth connecting piece; 4, first driving piece; 41, rear mounting pipe; 42, front mounting pipe. DETAILED DESCRIPTION

[0043] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application.

[0044] In the description of the present application, it should be noted that the positions or location relations indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the positions or location relations shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a specific position, to be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0046] Please refer to Figures 1 to 17The utility model provides a sofa support, including leg stretching assembly 1 and mounting frame 2 connected with each other, leg stretching assembly 1 includes the first drive connecting rod 11 and support connecting rod 12 articulated to mounting frame 2, still include first extension connecting rod 15, second extension connecting rod 13, main ottoman connecting rod 14, auxiliary ottoman connecting rod 17 and second drive connecting rod 16, wherein: first extension connecting rod 15 one end is articulated to the free end of support connecting rod 12, and its articulation point is first articulation point 191, and the other end of first extension connecting rod 15 is articulated to second drive connecting rod 16, and first extension connecting rod 15 is articulated to main ottoman connecting rod 14, auxiliary ottoman connecting rod 17 one end is articulated to main ottoman connecting rod 14, and the free end of second drive connecting rod 16 is articulated to auxiliary ottoman connecting rod 17, second extension connecting rod 13 one end is articulated to main ottoman connecting rod 14, and its articulation point is second articulation point 194, and the other end of second extension connecting rod 13 is articulated to the free end of first drive connecting rod 11, second extension connecting rod 13 and support connecting rod 12 are articulated between the two end points of both, and its articulation point is third articulation point 193, when first drive connecting rod 11 rotates around its articulation point with mounting frame 2, define the rod section of first extension connecting rod 15 between second articulation point 194 and third articulation point 193 as main rod section, when observing first extension connecting rod 15 from the axial direction of the rotation shaft of first drive connecting rod 11 along the outer side of second extension connecting rod 13, the upper edge of main rod section can be blocked by second extension connecting rod 13, the mounting frame 2 in the embodiment can be any mounting frame 2 applied to workable sofa in the prior art, and cooperating with leg stretching assembly 1 can constitute sofa support.

[0047] In the embodiment, the articulation point of first extension connecting rod 15 and main ottoman connecting rod 14 is fifth articulation point 196, and the articulation point of auxiliary ottoman connecting rod 17 and main ottoman connecting rod 14 is fourth articulation point 195, second articulation point 194, fifth articulation point 196 and fourth articulation point 195 are not collinear, and the articulation point of first drive connecting rod 11 and second extension connecting rod 13 is sixth articulation point 192, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 and Figure 10 , first extension connecting rod 15, second extension connecting rod 13, main ottoman connecting rod 14 and support connecting rod 12 constitute a first planar four-bar mechanism, and the planar four-bar mechanism can be adjusted in the posture of Figures 2 to 3 under the condition that first drive connecting rod 11 exerts external force on second extension connecting rod 13, more specifically, as shown in Figures 8 to 10 (from the storage state to the stretched state) or Figures 10 to 8(From the stretched state to the storage state), so as to realize the posture adjustment of the functional sofa and facilitate the use of the user. When in use, the leg stretching assembly 1 is in the storage state, and the user does not need to support the leg part for relaxation. When the user adjusts the leg stretching assembly 1 to the stretched state, the main ottoman connecting rod 14 can provide upward supporting force for the feet or the lower leg part of the user, so as to achieve the purpose of relieving the fatigue of the lower limbs of the user.

[0048] In the embodiment, the first extension connecting rod 15 and the second extension connecting rod 13 are a pair of opposite sides of the first planar four-bar mechanism, and the first extension connecting rod 15 is on the inner side of the second extension connecting rod 13. Here, the second extension connecting rod 13 is widened to shield the first extension connecting rod 15 on the outer side, so that the upper edge of the rod segment of the first extension connecting rod between the second hinge point 194 and the third hinge point 193 coincides with the second extension connecting rod 13 in the axial direction of the rotation shaft of the first driving connecting rod 11, that is, the upper edge of the main rod segment can be shielded by the second extension connecting rod 13 when viewed from the outer side of the second extension connecting rod 13 along the rotation shaft axial direction of the first driving connecting rod 11 towards the first extension connecting rod 15 (towards the inner side as shown in Figure 8 . Further, the gap between the first extension connecting rod 15 and the second extension connecting rod 13 can be avoided from causing injury to the user during the posture adjustment of the leg stretching assembly 1. It should be noted that the area of the main rod segment is not fixed, but changes continuously with the movement of the leg stretching assembly 1. The second extension connecting rod 13 as a constituent rod of the leg stretching assembly 1 plays a role in structural support and connection and a safety protection role, without the need for an additional specific anti-pinch member, which simplifies the structure of the sofa support while ensuring safety.

[0049] Further, as shown in Figure 1 , Figure 2 and Figure 3 , the main ottoman connecting rod 14, the second driving connecting rod 16, the first extension connecting rod 15 and the auxiliary ottoman connecting rod 17 constitute a second planar four-bar mechanism, and the second planar four-bar mechanism is connected in series with the first planar four-bar mechanism. When the first planar four-bar mechanism is adjusted in posture, the second planar four-bar mechanism is adjusted in posture as well. The auxiliary ottoman connecting rod 17 can supplement the main ottoman connecting rod 14 in the structural space, so that the leg stretching assembly 1 can provide a larger supporting area for the feet or the lower leg part of the user in the stretched state under the condition that the distance between the leg stretching assembly 1 and the ground is basically unchanged after storage, which can improve the supporting effect and make the functional sofa with the sofa support adapt to users of a larger body size, that is, the user coverage is wider.

[0050] As shown in Figure 2 , Figure 4 , Figure 8 andFigure 10 As shown, the second extension link 13 comprises a lower working section 132 and an upper working section 131 connected to each other, the lower working section 132 is connected to the first driving link 11, and the upper working section 131 is connected to the main ottoman link 14; the first transition round corner 133 is arranged at the connection between the lower working section 132 and the upper working section 131, and is distributed on the side close to the first hinge point 191; the first transition round corner 133 is protrudingly arranged towards the first hinge point 191. In this embodiment, the upper working section 131 and the lower working section 132 are integrally formed, and the third hinge point 193 and the sixth hinge point 192 are both arranged on the lower working section 132. After assembly, no matter whether the sofa support is in the storage state or the stretched state, the structural center of the upper working section 131 is always higher than that of the lower working section 132, so that the leg stretching assembly 1 always keeps the upper end of the main ottoman link 14 up, which on the one hand can make the main ottoman link 14 as high as possible to support the user's feet or lower legs when the sofa support is in the stretched state, so as to promote the blood circulation of the user's lower limbs to achieve the purpose of relaxation; on the other hand, when the sofa support is in the storage state, the upper end of the leg stretching assembly 1 is up, so that the space between the leg stretching assembly 1 and the ground is large, which is convenient for the user to clean the space below the leg stretching assembly 1.

[0051] In this embodiment, as shown in Figure 2 , Figure 3 and Figure 4 , the first transition round corner 133 is used to shield part of the structure of the first hinge point 191. Specifically, during the posture adjustment of the first planar four-bar mechanism, the first hinge point 191 makes a circular motion around the third hinge point 193, and the structure of the first transition round corner 133 is basically adapted to the motion track of the first hinge point 191, which can shield the first hinge point 191 during its motion, and can reduce the width of the second extension link 13 as much as possible on the basis of shielding the first extension link 15, thereby saving the production cost of the second extension link 13, reducing the volume of the leg stretching assembly 1, increasing the height between the leg stretching assembly 1 and the ground, and facilitating the user to clean.

[0052] In this embodiment, the second extension link 13 is provided with a limiting protrusion 18; the support link 12 is provided with a storage notch 122 and a stretching notch 121 matched with the limiting protrusion 18; when the first driving link 11 rotates, the storage notch 122 is used to cooperate with the limiting protrusion 18 to make the leg stretching assembly 1 in the storage state, and the stretching notch 121 is used to cooperate with the limiting protrusion 18 to make the leg stretching assembly 1 in the stretched state. As shown in Figure 1 , Figure 2 , Figure 4 and Figure 7As shown, the extension gap 121 and the accommodation gap 122 here are used to cooperate with the limiting protrusion 18, specifically, as shown in Figure 2 As shown, during the rotation of the first driving link 11 to drive the leg extension assembly 1 to move, the support link 12 and the second extension link 13 rotate relative to each other around the third hinge point 193. When the support link 12 rotates clockwise around the third hinge point 193 relative to the second extension link 13 to the extent that the extension gap 121 is clamped to the limiting protrusion 18, the extension assembly is kept in the extended state; while when the support link 12 rotates counterclockwise around the third hinge point 193 relative to the second extension link 13 to the extent that the accommodation gap 122 is clamped to the limiting protrusion 18, the extension assembly is kept in the accommodation state. In this embodiment, the limiting protrusion 18 is distributed between the third hinge point 193 and the sixth hinge point 192; the accommodation gap 122 and the extension gap 121 are both arranged towards the limiting protrusion 18.

[0053] As shown in Figure 2 and Figure 3 The main ottoman link 14 is configured with a first assembly surface 141, and the auxiliary ottoman link 17 is configured with a second assembly surface 171; when the leg extension assembly 1 is in the accommodation state, the first assembly surface 141 and the second assembly surface 171 form a first included angle α, and the first included angle α is 85°-95°; when the leg extension assembly 1 is in the extended state, the first assembly surface 141 and the second assembly surface 171 form a second included angle β, and the second included angle β is 0°-10°. In this embodiment, preferably, when the leg extension assembly 1 is in the accommodation state, the first included angle α is 90°; when the leg extension assembly 1 is in the extended state, the second included angle β is 0°. As shown in Figure 3 and Figure 8 As shown, when the leg extension assembly 1, i.e. the sofa support, is in the accommodation state, the first assembly surface 141 is basically perpendicular to the ground, and the second assembly surface 171 is basically parallel to the ground. Such arrangement makes the leg extension assembly 1 compact in structure and small in space occupation. As shown in Figure 2 and Figure 10 When the leg extension assembly 1, i.e. the sofa support, is in the extended state, the first assembly surface 141 and the second assembly surface 171 are basically parallel and arranged towards the same side, so that the second assembly surface 171 can well expand the support area of the first assembly surface 141 in function, increase the support area of the leg extension assembly 1, and be conducive to improving the comfort of the leg extension assembly 1.

[0054] As shown in Figure 5 and Figure 6As shown, in the embodiment, the first extension link 15 comprises a front working section 153, a middle working section 152 and a rear working section 151 connected in sequence, wherein the rear working section 151 is connected to the support link 12; and a second transition fillet 154 is arranged at the connection between the rear working section 151 and the middle working section 152, and the second transition fillet 154 is arranged protruding away from the first hinge point 191. The front working section 153, the middle working section 152 and the rear working section 151 are integrally formed. The rear working section 151 and the middle working section 152 are arranged at an angle, which can make the upper edge of the rod section between the first hinge point 191 and the second hinge point 194 closer to the upper edge of the second extension link 13 without changing the action of the first extension link 15, so that the structure is compact, the second extension link 13 can shield the first extension link 15, the gap between the lower edge of the second extension link 13 and the upper edge of the first extension link 15 is prevented, the user is prevented from being pinched, and the safety is high. The second transition fillet 154 formed at the connection between the rear working section 151 and the middle working section 152 can reduce stress concentration at the connection, and the structural strength is high.

[0055] In the embodiment, the front working section 153 comprises a working part 1532 and a transition part 1531 connected to each other, the transition part 1531 is connected to the middle working section 152, and the working part 1532 is connected to the second driving link 16; and the working part 1532 is parallel to and not coplanar with the middle working section 152. Figure 1 、 Figure 5 and Figure 6 As shown, the structure that the working part 1532 is parallel to and not coplanar with the middle working section 152 facilitates the articulation of the working part 1532 and the second driving link 16.

[0056] In the embodiment, the articulation point between the support link 12 and the mounting frame 2 is a seventh hinge point 197, the axis of rotation of the first driving link 11 when rotating about the articulation point of the mounting frame 2 is defined as a reference axis, and the plane perpendicular to the reference axis is a reference plane; the distance between the projection point of the first hinge point 191 in the reference plane and the projection point of the seventh hinge point 197 in the reference plane is D1, and D1 = 200-240 mm. In the embodiment, preferably, D1 = 215.53 mm. As shown, Figure 7 The support link 12 is respectively provided with an articulation hole three 123 and an articulation hole four 124, wherein the seventh hinge point 197 is located on the central axis of the articulation hole three 123, the first hinge point 191 is located on the central axis of the articulation hole four 124, and the central axes of the articulation hole three 123 and the articulation hole four 124 are parallel to the reference axis. Here, D1 is the distance between the central axis of the articulation hole three 123 and the central axis of the articulation hole four 124. Here, the length of D1 is limited, which can ensure the opening length of the leg stretching assembly 1 in the stretched state, and also can ensure that no interference with the ground occurs during storage.

[0057] Further, the mounting rack 2 comprises a seat frame 21 and an adjusting assembly for adjusting the seat frame 21, wherein: the adjusting assembly comprises oppositely arranged a fixed base plate 201, a rotating driving plate 202 and an adjusting mechanism, the rotating driving plate 202 is adjustably connected to the fixed base plate 201 through the adjusting mechanism; the rotating driving plate 202 is adjustably connected to the seat frame 21 through at least two first connecting pieces 22, the first end of the first connecting piece 22 is hingedly connected to the seat frame 21, and the other end is hingedly connected to the rotating driving plate 202. Here, the seat frame 21 and the rotating driving plate 202 are hingedly connected through the two first connecting pieces 22 to constitute a planar four-bar mechanism as shown in Figure 11 indicated. In use, the fixed base plate 201 is fixedly installed relative to the ground, and the posture of the planar four-bar mechanism composed of the seat frame 21, the rotating driving plate 202 and the first connecting piece 22 is adjusted by driving the rotating driving plate 202, so as to realize the posture adjustment of the seat frame 21.

[0058] In the embodiment, as shown in Figure 13 , the first connecting piece 22 is provided with a hinge hole five 221 and a hinge hole six 222, the hinge point of the first connecting piece 22 with the seat frame 21 is an eighth hinge point, the hinge point of the first connecting piece 22 with the rotating driving plate 202 is a ninth hinge point, the distance between the projection point of the eighth hinge point in the reference plane and the projection point of the ninth hinge point in the reference plane is D2, D2 = 110-150mm. In the embodiment, preferably, D2 = 125.5mm. It can be ensured that the height of the sofa or seat can reach 430-500mm when the sofa support is applied to the sofa or seat. In the embodiment, the eighth hinge point is on the central axis of the hinge hole five 221, and the ninth hinge point is on the central axis of the hinge hole six 222, and the central axes of the hinge hole five 221 and the hinge hole six 222 are parallel to the reference axis. Here, D2 is the distance between the central axis of the hinge hole five 221 and the central axis of the hinge hole six 222.

[0059] Further, as shown in Figures 10 to 12As shown, the adjusting mechanism comprises a second connecting member 23, a third connecting member 24, a fourth connecting member 25, a fifth connecting member 26, a sixth connecting member 27, a seventh connecting member 28 and an eighth connecting member 29, wherein: the second connecting member 23 is provided with a first hinge hole 231 and a second hinge hole, the second connecting member 23 is hingedly connected to the rotating driving plate 202 through the first hinge hole 231, the second connecting member 23 is hingedly connected to the third connecting member 24 through the second hinge hole, and the second hinge hole is between the two ends of the third connecting member 24; the first end of the third connecting member 24 is hingedly connected to the fixed base plate 201, and the second end is hingedly connected to the first end of the fourth connecting member 25; the second end of the fourth connecting member 25 is hingedly connected to the fifth connecting member 26, and the hinge points of the two are between the two ends of the fifth connecting member 26; the first end of the fifth connecting member 26 is hingedly connected to the second connecting member 23, and the hinge points of the two are between the first hinge hole 231 and the second hinge hole, and the second end of the fifth connecting member 26 is hingedly connected to the first end of the sixth connecting member 27; the second end of the sixth connecting member 27 is hingedly connected to the fixed base plate 201; the first end of the seventh connecting member 28 is hingedly connected to the sixth connecting member 27, and the hinge points of the two are between the two ends of the sixth connecting member 27, and the second end of the seventh connecting member 28 is hingedly connected to the rotating driving plate 202; the first end of the eighth connecting member 29 is hingedly connected to the rotating driving plate 202, and the second end is hingedly connected to the first driving connecting rod 11.

[0060] In this embodiment, the front end (the end close to the leg stretching assembly 1) of the rotating driving plate 202 is adjustably mounted to the front end (the end close to the leg stretching assembly 1) of the fixed base plate 201 through the seventh connecting member 28 and the sixth connecting member 27, and the rear end (the end opposite to the front end) of the rotating driving plate 202 is adjustably mounted to the rear end (the end opposite to the front end) of the fixed base plate 201 through the second connecting member 23 and the third connecting member 24, and the first connecting member 22, the fourth connecting member 25, the fifth connecting member 26 and the eighth connecting member 29 cooperate to enable the posture of the seat frame 21 to be adjusted when the rotating driving plate 202 rotates. Specifically, when the rotating driving plate 202 is forwardly driven, the adjusting mechanism drives the seat frame 21 to lift the front end (the end close to the leg stretching assembly 1) of the seat frame 21 relative to the ground and lower the rear end of the seat frame 21 relative to the ground, so that the sofa support is adjusted to a lying posture, and at this time, the leg stretching assembly 1 is in an extended state, so that the user can realize a zero-gravity lying posture; on the contrary, when the rotating driving plate 202 is reversely driven, the adjusting mechanism drives the seat frame 21 to lower the front end (the end close to the leg stretching assembly 1) of the seat frame 21 relative to the ground and lift the rear end of the seat frame 21 relative to the ground, so that the sofa support is adjusted to a sitting posture, and at this time, the leg stretching assembly 1 is in a storage state, so that the user can realize a conventional sitting posture.

[0061] In the embodiment, the seat frame 21 is provided with the backrest assembly 3 for providing support to the back of the user to better realize the posture adjustment of the sofa support. Specifically, the backrest assembly 3 comprises a backrest connecting block 31, a backrest limiting block 32, a backrest limiting rod 33, and a ninth connecting piece 35. The backrest connecting block 31 is hingedly connected to the backrest limiting block 32. One end of the ninth connecting piece 35 is hingedly connected to the two end points of the backrest connecting block 31, and the other end is hingedly connected to the backrest limiting rod 33. The backrest limiting rod 33 is provided with a limiting column 331. The backrest limiting block 32 is provided with a limiting surface 321 matched with the limiting column 331. The backrest limiting block 32 is fixedly connected to the seat frame 21. Further, the backrest assembly 3 further comprises a tenth connecting piece 34. A first end of the tenth connecting piece 34 is hingedly connected to the fixed base plate 201, and the hinging point of the two is the tenth hinging point. A second end of the tenth connecting piece 34 is hingedly connected to one end of the backrest limiting rod 33 away from the backrest connecting block 31, and the hinging point of the two is the eleventh hinging point. The distance between the projection point of the tenth hinging point in the reference plane and the projection point of the eleventh hinging point in the reference plane is D3, and D3 = 65-100 mm. In the embodiment, preferably, D3 = 74.18 mm. As shown in Figure 11 and Figure 14 shown, the ninth connecting piece 35 is respectively provided with a hinging hole seven 341 and a hinging hole eight 342. The tenth hinging point is on the central axis of the hinging hole eight 342, and the eleventh hinging point is on the central axis of the hinging hole seven 341. The central axis of the hinging hole eight 342 and the central axis of the hinging hole seven 341 are both parallel to the reference axis. Here, D3 is the distance between the central axis of the hinging hole eight 342 and the central axis of the hinging hole seven 341.

[0062] As shown in Figure 11 , in the embodiment, the backrest limiting block 32 is bifurcated and has two ends, which are the upper end and the lower end. One end of the backrest connecting block 31 is hingedly connected to the upper end of the backrest limiting block 32, and the lower end of the backrest limiting block 32 is hingedly connected to the two end points of the backrest limiting rod 33. In use, when the sofa support is adjusted from the sitting posture to the lying posture (zero gravity) state as shown in Figure 17 , the rear end of the seat frame 21 is lowered relative to the ground, so that the upper end of the backrest limiting block 32 mounted on the rear end of the seat frame 21 is raised relative to the ground, and the lower end of the backrest limiting block 32 is lowered relative to the ground, thereby driving the backrest connecting block 31 to rotate clockwise around the upper end of the backrest limiting block 32, and driving the backrest connecting block 31 to drive the backrest limiting rod 33 to rotate counterclockwise around the lower end of the backrest limiting block 32 through the ninth connecting piece 35, until the limiting column 331 abuts against the limiting surface 321, so that the upper body of the user can realize a lower lying posture, thereby better realizing the zero gravity lying posture. The embodiment also provides a seat unit comprising the sofa support described above. The seat unit can be used for a functional sofa, which can provide support to the feet or lower legs of the user and provide the user with a zero gravity lying posture through posture adjustment, which is convenient to use.

[0063] Specifically, as shown in Figure 15 and Figure 16 , two parallel and linked sofa supports are installed in the seat unit, and the two sofa supports are linked at least by the front mounting pipe 42 and the rear mounting pipe 41. Specifically, one end of the front mounting pipe 42 is connected to the first driving link 11 of one of the sofa supports, and the other end is connected to the first driving link 11 of the other sofa support (not shown in the figure), and similarly, one end of the rear mounting pipe 41 is connected to the fixed base plate 201 of one of the sofa supports, and the other end is connected to the fixed base plate 201 of the other sofa support. A first driving member 4 is arranged between the front mounting pipe 42 and the rear mounting pipe 41 to provide driving force to the first driving link 11. The first driving member 4 here can be an electric push rod.

[0064] In this embodiment, the distance from the lowest point of the rear mounting pipe 41 to the ground is D4, and D4 = 30-60mm. Preferably, D4 = 45.6mm.

[0065] As shown in Figure 12 , in this embodiment, the fixed base plate 201 is provided with a rear mounting hole, and the center of the rear mounting hole is 60-100mm above the ground. Preferably, the center of the rear mounting hole is 85mm above the ground.

[0066] The technical means disclosed in the present application is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which are considered to be within the scope of protection of the present application.

Claims

1. A sofa bracket comprising a leg extension assembly (1) and a mounting bracket (2) connected to each other, characterized in that, The leg stretching assembly (1) comprises a first driving link (11) and a supporting link (12) hinged to the mounting frame (2); further comprising a first extension link (15), a second extension link (13), a main ottoman link (14), a secondary ottoman link (17) and a second driving link (16), wherein: One end of the first extension link (15) is hinged to the free end of the supporting link (12), and the hinging point is a first hinging point (191); the other end of the first extension link (15) is hinged to the second driving link (16), and the first extension link (15) is hinged to the main ottoman link (14); one end of the secondary ottoman link (17) is hinged to the main ottoman link (14), and the free end of the second driving link (16) is hinged to the secondary ottoman link (17); One end of the second extension link (13) is hinged to the main ottoman link (14), and the hinging point is a second hinging point (194); the other end of the second extension link (13) is hinged to the free end of the first driving link (11); The second extension link (13) and the supporting link (12) are hinged between the two end points of both, and the hinging point is a third hinging point (193); When the first driving link (11) rotates around the hinging point with the mounting frame (2), the rod segment of the first extension link (15) between the second hinging point (194) and the third hinging point (193) is defined as a main rod segment, and when observing the first extension link (15) from the outside of the second extension link (13) along the rotation axis of the first driving link (11) axially, the upper edge of the main rod segment can be blocked by the second extension link (13); The second extension link (13) is provided with a limiting protrusion (18); The supporting link (12) is provided with a receiving gap (122) and an extending gap (121) matched with the limiting protrusion (18); When the first driving link (11) rotates, the receiving gap (122) is used to limit the limiting protrusion (18) so that the leg stretching assembly (1) is in a receiving state, and the extending gap (121) is used to limit the limiting protrusion (18) so that the leg stretching assembly (1) is in an extending state; During the rotation driving of the first driving link (11) to move the leg stretching assembly (1), the supporting link (12) and the second extension link (13) rotate relatively around the third hinging point (193), and when the supporting link (12) rotates clockwise relative to the second extension link (13) around the third hinging point (193) to the extending gap (121) clamped to the limiting protrusion (18), the leg stretching assembly (1) remains in the extending state; And when the supporting link (12) rotates counterclockwise relative to the second extension link (13) around the third hinging point (193) to the receiving gap (122) clamped to the limiting protrusion (18), the leg stretching assembly (1) remains in the receiving state.

2. The sofa frame of claim 1, wherein The hinge point of the first extension link (15) and the main ottoman link (14) is a fifth hinge point (196), and the hinge point of the auxiliary ottoman link (17) and the main ottoman link (14) is a fourth hinge point (195); The second hinge point (194), the fifth hinge point (196) and the fourth hinge point (195) are not collinear.

3. The sofa frame of claim 2, wherein The main ottoman link (14) is provided with a first assembly surface (141), and the auxiliary ottoman link (17) is provided with a second assembly surface (171); When the leg stretching assembly (1) is in the storage state, the first assembly surface (141) and the second assembly surface (171) form a first included angle (α); When the leg stretching assembly (1) is in the stretching state, the first assembly surface (141) and the second assembly surface (171) form a second included angle (β).

4. The sofa frame of claim 2, wherein The hinge point of the first driving link (11) and the second extension link (13) is a sixth hinge point (192), and the limiting protrusion (18) is distributed between the third hinge point (193) and the sixth hinge point (192); The storage gap (122) and the stretching gap (121) are both arranged towards the limiting protrusion (18).

5. The sofa frame of claim 4, wherein, The second extension link (13) comprises a lower working section (132) and an upper working section (131) connected to each other, the lower working section (132) is connected to the first driving link (11), and the upper working section (131) is connected to the main ottoman link (14); The first transition round corner (133) is arranged at the connection between the lower working section (132) and the upper working section (131) and is distributed on one side close to the first hinge point (191); The first transition round corner (133) is arranged protruding towards the first hinge point (191).

6. The sofa frame of claim 5, wherein, The third hinge point (193) and the sixth hinge point (192) are both arranged on the lower working section (132).

7. The sofa frame of claim 1, wherein The first extension link (15) comprises a front working section (153), a middle working section (152) and a rear working section (151) connected in sequence, wherein: The rear working section (151) is connected to the support link (12); The second transition round corner (154) is arranged at the connection between the rear working section (151) and the middle working section (152) and is arranged protruding away from the first hinge point (191).

8. The sofa frame of claim 7, wherein, The front working section (153) comprises a working part (1532) and a transition part (1531) connected to each other, the transition part (1531) is connected to the middle working section (152), and the working part (1532) is connected to the second driving link (16); The working part (1532) is parallel to the middle working section (152) and is not coplanar with the middle working section (152).

9. The sofa frame according to any one of claims 1-8, wherein, The hinge point between the support link (12) and the mounting rack (2) is a seventh hinge point (197); A reference axis is defined as the rotation axis of the first driving link (11) when rotating around the hinge point between the first driving link (11) and the mounting rack (2), and a reference plane is perpendicular to the reference axis; The distance between the projection point of the first hinge point (191) in the reference plane and the projection point of the seventh hinge point (197) in the reference plane is 200-240 mm.

10. The sofa frame of claim 9, wherein, The mounting rack (2) comprises a seat frame (21) and an adjusting assembly for adjusting the seat frame (21), wherein: The adjusting assembly comprises oppositely arranged fixed base plates (201), a rotating driving plate (202) and an adjusting mechanism, the rotating driving plate (202) is adjustably connected to the fixed base plates (201) through the adjusting mechanism; The rotating driving plate (202) is adjustably connected to the seat frame (21) through at least two first connecting members (22), one end of the first connecting member (22) is hingedly connected to the seat frame (21), and the other end is hingedly connected to the rotating driving plate (202).

11. The sofa frame of claim 10, wherein, The hinged point of the first connecting member (22) and the seat frame (21) is the eighth hinge point, and the hinged point of the first connecting member (22) and the rotating driving plate (202) is the ninth hinge point. The distance between the projection point of the eighth hinge point in the reference plane and the projection point of the ninth hinge point on the same first connecting member (22) in the reference plane is 110-150 mm.

12. The sofa frame according to claim 10 or 11, characterized in that The adjusting mechanism comprises a second connecting member (23), a third connecting member (24), a fourth connecting member (25), a fifth connecting member (26), a sixth connecting member (27), a seventh connecting member (28) and an eighth connecting member (29), wherein: The second connecting member (23) is provided with a hinged hole one (231) and a hinged hole two, the second connecting member (23) is hingedly connected to the rotating driving plate (202) through the hinged hole one (231), and the second connecting member (23) is hingedly connected to the third connecting member (24) through the hinged hole two, the hinged hole two is between the two ends of the third connecting member (24); The first end of the third connecting member (24) is hingedly connected to the fixed base plate (201), and the second end is hingedly connected to the first end of the fourth connecting member (25); The second end of the fourth connecting member (25) is hingedly connected to the fifth connecting member (26), and the hinged points of the two are between the two ends of the fifth connecting member (26); The first end of the fifth connecting member (26) is hingedly connected to the second connecting member (23), and the hinged points of the two are between the hinged hole one (231) and the hinged hole two, and the second end of the fifth connecting member (26) is hingedly connected to the first end of the sixth connecting member (27); The second end of the sixth connecting member (27) is hingedly connected to the fixed base plate (201); The first end of the seventh connecting member (28) is hingedly connected to the sixth connecting member (27), and the hinged points of the two are between the two ends of the sixth connecting member (27), and the second end of the seventh connecting member (28) is hingedly connected to the rotating driving plate (202); The first end of the eighth connecting member (29) is hingedly connected to the rotating driving plate (202), and the second end is hingedly connected to the first driving connecting rod (11).

13. The sofa frame of claim 10, wherein, The seat frame (21) is provided with a backrest assembly (3), the backrest assembly (3) comprises a backrest connecting block (31), a backrest limiting block (32), a backrest limiting rod (33), a ninth connecting piece (35), the backrest connecting block (31) is hinged with the backrest limiting block (32), one end of the ninth connecting piece (35) is hinged between two end points of the backrest connecting block (31), the other end is hinged to the backrest limiting rod (33), the backrest limiting rod (33) is provided with a limiting column (331), the backrest limiting block (32) is provided with a limiting surface (321) matched with the limiting column (331); The backrest limiting block (32) is fixedly connected to the seat frame (21).

14. The sofa frame of claim 13, wherein, The backrest assembly (3) further comprises a tenth connecting piece (34), a first end of the tenth connecting piece (34) is hinged to the fixed base plate (201), and the hinge points of the two are the tenth hinge points; A second end of the tenth connecting piece (34) is hinged to one end of the backrest limiting rod (33) away from the backrest connecting block (31), and the hinge points of the two are the eleventh hinge points; The distance between the projection point of the tenth hinge point in the reference plane and the projection point of the eleventh hinge point in the reference plane is 65-100mm.

15. A seating unit characterized by: The sofa support comprises the sofa support according to any one of claims 1-14.

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