Seat stretching device and seat

Abstract

The utility model discloses a seat stretching device and seat, including leg stretching subassembly and footrest subassembly, leg stretching subassembly includes first leg connecting rod, second leg connecting rod and leg support, the leg support is equipped with first hinge point, second hinge point, third hinge point and fourth hinge point, the first leg connecting rod is articulated with the first hinge point, the second leg connecting rod is articulated with the second hinge point, and the third hinge point is articulated with the fourth hinge point. The footrest assembly comprises a foot support, a first footrest extension connecting rod, a second footrest extension connecting rod and a footrest connecting rod, the first end of the footrest connecting rod is hinged to the fourth hinge point, the second end of the footrest connecting rod is hinged to the foot support, the first end of the first footrest extension connecting rod is hinged to the second leg connecting rod, and the second end of the second footrest extension connecting rod is hinged to the second leg connecting rod. The second end of the first footrest extension connecting rod is hinged to the foot support, the first end of the second footrest extension connecting rod is hinged to the first footrest extension connecting rod, and the second end of the second footrest extension connecting rod is hinged to a third hinge point of the foot support. The footrest assembly provides support for the feet, and provides better comfort experience for the user.

Description

Technical Field

[0001] The utility model is used in the field of seats, in particular to a seat extension device and a seat. Background Art

[0002] Functional seating has seen rapid growth in the seating market in recent years, with more and more people choosing multifunctional chairs that offer comfort and comprehensive functionality. Functional seats offer significant advantages over traditional chairs, enabling smooth transitions from sitting to reclining positions, meeting various needs, including sitting, lounging, and sleeping. When sitting, the backrest provides excellent back support, and the seat height should be appropriate, ensuring the thighs and calves remain roughly perpendicular, with the feet flat on the ground. This relaxes the muscles at the base of the thighs. When lounging, the backrest remains stationary or slightly tilted. A footrest slowly opens, supporting the legs and relaxing the calf muscles. When reclining, the backrest moves backward, allowing the body to lie flat on the seat, completely relaxing the spine. The footrest can also be horizontally positioned, supporting the legs and relieving leg fatigue. Existing functional seats generally provide leg support when reclining, but lack support for the feet. To meet the user's functional needs and enhance comfort, a footrest is essential. In addition, a mechanical extension device is also necessary to ensure that the functional seat moves smoothly during posture changes and avoid sudden changes in speed, shaking, tilting, and jamming. Utility Model Content

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a seat extension device and a seat.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] In the first aspect, a chair extension device includes a leg extension assembly and a footrest assembly, the leg extension assembly includes a first extension link, a second extension link, a first leg link, a second leg link and a leg support, the leg support is provided with a first hinge point, a second hinge point, a third hinge point and a fourth hinge point in sequence along the extension direction of the chair, the first leg link is hinged to the first hinge point of the leg support, the second leg link is hinged to the second hinge point of the leg support, the footrest assembly includes a footrest, a first footrest extension link, a second footrest extension link and a footrest link, the first end of the footrest link is hinged to the leg support The fourth hinge point, the second end of the footrest link is hinged to the footrest, the first end of the first footrest extension link is hinged to the second leg link, the second end of the first footrest extension link is hinged to the footrest, the first end of the second footrest extension link is hinged to the first footrest extension link, the second end of the second footrest extension link is hinged to the third hinge point of the footrest, the first leg link is hinged to the first extension link, the first leg link crosses the second extension link and is hinged to the second extension link at the crossing position, and the second leg link is hinged to the second extension link.

[0006] In combination with the first aspect, in certain implementations of the first aspect, the leg rest includes a vertical plate and a first wing plate arranged at the edge of the vertical plate and bent to one side, the first hinge point, the second hinge point, the third hinge point and the fourth hinge point are arranged on the vertical plate, the foot rest includes a connecting rod portion, the first end of the connecting rod portion is hinged to the first footrest extension connecting rod, and the second end of the connecting rod portion is provided with a second wing plate bent to one side.

[0007] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a first limiting groove is provided on the edge of the first leg link, and a first limiting block is provided at the second hinge point. After the leg extension assembly is folded, the first limiting block is embedded in the first limiting groove.

[0008] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, during the deployment of the leg extension assembly and the footrest assembly, the leg rest deploys outwards driven by the first leg link and the second leg link, the leg rest drives the first footrest extension link through the second footrest extension link, the foot rest flips outwards of the leg rest under the drive of the first footrest extension link and the constraint of the footrest link, and the second footrest extension link is stretched between the leg rest and the first footrest extension link.

[0009] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, during the folding process of the leg extension assembly and the footrest assembly, the leg rest is folded and retracted under the drive of the first leg link and the second leg link, and the leg rest pushes the first footrest extension link through the second footrest extension link. The foot rest is folded toward the inside of the leg rest under the drive of the first footrest extension link and the constraint of the footrest link, and the second footrest extension link is supported between the leg rest and the first footrest extension link.

[0010] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the seat extension device also includes a seat frame mounting plate, the first extension link is hinged to a first position at the front of the seat frame mounting plate, the second extension link is hinged to a second position at the front of the seat frame mounting plate, and the first position and the second position are staggered in the front-to-back direction on the seat frame mounting plate.

[0011] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the seat extension device also includes a first driving arm and a second driving arm, the first end of the first driving arm is connected to the driving rod, the driving rod is rotatably mounted on the seat frame mounting plate, the second end of the first driving arm is hinged to the first end of the second driving arm, and the second end of the second driving arm is hinged to the second extension link.

[0012] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the seat extension device also includes a seat frame mounting plate lifting assembly, the seat frame mounting plate lifting assembly includes a bottom frame, a front support link, a rear support link, a front suspension, a rear suspension and an intermediate suspension, the front suspension is hinged to the front of the seat frame mounting plate, the first end of the front support link is hinged to the front suspension, the second end of the front support link is hinged to the bottom frame, the rear suspension is hinged to the rear of the seat frame mounting plate, the first end of the rear support link is hinged to the rear suspension, the second end of the rear support link is hinged to the bottom frame, the first end of the intermediate suspension is hinged to the front suspension, and the second end of the intermediate suspension is hinged to the rear suspension.

[0013] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the seat frame mounting plate lifting assembly also includes a transmission lever, a first transmission link and a second transmission link, the middle portion of the transmission lever is hinged to the seat frame mounting plate, the first end of the first transmission link is hinged to the first extension link, the second end of the first transmission link is hinged to the first end of the transmission lever, the first end of the second transmission link is hinged to the front support link, and the second end of the second transmission link is hinged to the second end of the transmission lever.

[0014] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the transmission lever is provided with an arcuate groove, the drive rod passes through the arcuate groove, and when the transmission lever rotates around the hinge point in the middle, the drive rod moves along the arcuate groove relative to the transmission lever.

[0015] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the seat frame mounting plate is provided with a drive rod mounting hole, the drive rod is rotatably installed in the drive rod mounting hole, a bushing is provided between the drive rod and the drive rod mounting hole, and the bushing is embedded in the arc groove.

[0016] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the transmission lever is provided with a second limit block above the intermediate suspension, and the top edge of the intermediate suspension is provided with a second limit groove that cooperates with the second limit block. When the transmission lever rotates around the middle hinge point to the extreme position, the second limit block is embedded in the second limit groove.

[0017] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the hinge position of the rear suspension and the rear support link is higher than the hinge position of the rear suspension and the seat frame mounting plate, the rear suspension is provided with a third limit block in front of the rear support link, and the rear support link is provided with a third limit groove that cooperates with the third limit block.

[0018] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, a fourth limit block is provided in front of the bottom frame and the rear support link, and when the rear support link swings forward to the extreme position around the hinge point at the second end, the rear support link abuts against the fourth limit block.

[0019] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the front suspension is provided with a fifth limit block that abuts against the seat frame mounting plate when it swings forward to an extreme position.

[0020] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the seat extension device also includes a backrest component and a backrest support rod, the bottom front end of the backrest component is hinged to the rear of the seat frame mounting plate, the bottom rear end of the backrest component is hinged to the first end of the backrest support rod, and the second end of the backrest support rod is hinged to the rear suspension.

[0021] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a tailstock extending backward is provided at the bottom of the rear suspension, and the second end of the backrest support rod is hinged to the tailstock.

[0022] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the seat frame mounting plate and the tail stock are connected to a tension spring.

[0023] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, the tailstock is provided with a sixth limit block, and when the rear suspension rotates to the extreme position, the sixth limit block abuts against the seat frame mounting plate from the rear side.

[0024] In combination with the first aspect and the above-mentioned implementation methods, in certain implementation methods of the first aspect, the first end of the first driving arm rod is provided with a third wing plate bent in the length direction of the driving rod, the third wing plate is in contact with the wall surface of the driving rod, the third wing plate and the wall surface of the driving rod are provided with fastener mounting holes, and the third wing plate and the driving rod are connected via fasteners arranged in the fastener mounting holes.

[0025] In a second aspect, a seat is provided, comprising the seat extension device described in any implementation of the first aspect.

[0026] One of the above technical solutions has at least one of the following advantages or beneficial effects: The technical solution of the present invention adds a footrest assembly to the leg extension assembly, that is, a footrest is provided outside the leg rest, wherein, during the extension process of the leg extension assembly, the leg rest is gradually unfolded outward from the storage state under the drive and constraint of the first leg link and the second leg link, and the leg rest gradually rotates and opens around the first hinge point. During this period, the footrest assembly is gradually unfolded outward from the storage state under the drive and constraint of the second leg link and the leg rest, thereby extending the footrest outside the opened leg rest to provide support for the feet and provide a better comfort experience for the user. In addition, the footrest assembly composed of the footrest, the first footrest extension link, the second footrest extension link and the footrest link can cooperate with the leg extension assembly. When the leg extension assembly is unfolded into place, the footrest assembly is also unfolded into place. The entire unfolding process is continuous and stable, ensuring that the functional seat moves smoothly during posture changes and avoiding speed mutations, tremors, tilting, jamming, etc.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of a sitting posture of an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of a TV posture state of an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of an embodiment of the present invention in a lying position;

[0032] Figure 4 This is a structural diagram of a seat frame mounting plate lifting assembly according to an embodiment of the present invention;

[0033] Figure 5 This is an axonometric diagram of a TV posture state of an embodiment of the present utility model;

[0034] Figure 6 This is a schematic structural diagram of an embodiment of the present invention in which a driving rod is arranged between the seat frame mounting plates on both sides;

[0035] Figure 7 This is a schematic diagram of the structure of a driving rod passing through an arc-shaped slot according to an embodiment of the utility model;

[0036] Figure 8 This is a schematic diagram of the drive rod mounting hole and arc-shaped groove structure of an embodiment of the utility model;

[0037] Figure 9 This is a schematic diagram of a seat frame mounting plate provided with a bushing structure according to an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of a bushing embedded in an arc groove in one embodiment of the utility model;

[0039] Figure 11 This is a structural schematic diagram of the second limiting block embedded in the second limiting groove in a sitting position in an embodiment of the present invention;

[0040] Figure 12 This is a schematic diagram of the structure of the fifth limit block abutting against the seat frame mounting plate from below in the sitting posture and TV posture states of an embodiment of the present invention;

[0041] Figure 13 This is a structural schematic diagram of the sixth limit block abutting against the seat frame mounting plate from the rear side in the sitting posture and TV posture states of an embodiment of the present invention. DETAILED DESCRIPTION

[0042] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0043] In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] In this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of this utility model, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0045] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0046] in, Figure 2-Figure 4 The reference direction coordinate system of the embodiment of the present utility model is given below. Figure 2-Figure 4 The embodiment of the present invention is described with reference to the direction shown.

[0047] See also Figure 1-Figure 5The embodiment of the present invention provides a chair extension device, including a leg extension assembly 100 and a footrest assembly 200, the leg extension assembly 100 includes a first leg connecting rod 101, a second leg connecting rod 102 and a leg support 103, the leg support 103 is provided with a first hinge point 1031, a second hinge point 1032, a third hinge point 1033 and a fourth hinge point 1034 in sequence along the extension direction of the chair, the fourth hinge point 1034 is located in front of the first hinge point 1031, the first leg connecting rod 101 is hinged to the first hinge point 1031 of the leg support 103, the second leg connecting rod 102 is hinged to the second hinge point 1032 of the leg support 103, the footrest assembly 200 includes a footrest 201, a first footrest extension link 202, a second footrest extension link 203 and a footrest link 204, the first end 2041 of the footrest link 204 is hinged to the fourth hinge point 1034 of the leg rest 103, the second end 2042 of the footrest link 204 is hinged to the foot rest 201, the first end 2021 of the first footrest extension link 202 is hinged to the second leg link 102, the second end 2022 of the first footrest extension link 202 is hinged to the foot rest 201, the first end 2031 of the second footrest extension link 203 is hinged to the first footrest extension link 202, and the second end 2032 of the second footrest extension link 203 is hinged to the third hinge point 1033 of the foot rest 201.

[0048] See also Figure 1 In the sitting state, the leg extension assembly 100 and the footrest assembly 200 are in a curled and folded state and stored at the bottom of the front end of the seat. When sitting, ensure that the thighs and calves remain basically vertical and the feet are flat on the ground, so that the muscles at the bottom of the thighs can be relaxed.

[0049] See also Figure 1 、 Figure 2 、 Figure 3, when the chair extension device switches from a sitting position to a TV position and a lying position, the leg extension assembly 100 and the footrest assembly 200 unfold forward and provide support for the legs and feet, relax the muscles of the calves and other parts, and meet the requirements of leisure, sleep, etc. The technical solution of the utility model adds a footrest assembly 200 on the basis of the leg extension assembly 100, that is, a footrest 201 is provided outside the leg rest 103, wherein, during the extension process of the leg extension assembly 100, the leg rest 103 is gradually unfolded outward from the storage state under the drive and constraint of the first leg connecting rod 101 and the second leg connecting rod 102, and the leg rest 103 gradually rotates and opens in a clockwise direction around the first hinge point 1031, and the leg rest 103 is further extended through the second footrest. The rod 203 drives the first footrest extension link 202 to rotate in a clockwise direction around the hinge point between the first footrest extension link 202 and the second leg link 102, and the angle between the first footrest extension link 202 and the second leg link 102 gradually increases. When the leg rest 103 switches to the TV posture, the top supporting surface of the leg rest 103 is roughly horizontal. When the leg rest 103 switches to the lying posture, the top supporting surface of the leg rest 103 is roughly tilted and upward at the front end. The footrest 201 is driven by the first footrest extension link 202 and constrained by the footrest link 204, and is flipped toward the outside of the leg rest 103. During this period, the angle between the footrest 201 and the first footrest extension link 202 gradually increases. When it approaches the extreme position, the extension direction of the footrest 201 and the extension direction of the first footrest extension link 202 are roughly on the same straight line. The second footrest extension link 203 is stretched between the leg rest 103 and the first footrest extension link 202, so that the footrest 201 can be lifted to the upper side of the leg rest 103.

[0050] See also Figure 1 、 Figure 2 、 Figure 3 During the process of the seat extension device switching from the TV posture and the lying posture to the sitting posture, the leg support 103 is gradually folded back from the unfolded state under the drive and constraint of the first leg link 101 and the second leg link 102, and the leg support 103 gradually rotates counterclockwise around the first hinge point 1031, and the leg support 103 further pushes the first footrest extension link 202 to rotate counterclockwise around the hinge point of the first footrest extension link 202 and the second leg link 102 through the second footrest extension link 203, and the angle between the first footrest extension link 202 and the second leg link 102 gradually becomes smaller, and the footrest 201 is folded toward the inside of the leg support 103 under the drive of the first footrest extension link 202 and the constraint of the footrest link 204, during which the angle between the footrest 201 and the first footrest extension link 202 gradually becomes smaller. Figure 1In the sitting position shown, the supporting surface of the leg rest 103 is roughly in a vertical position, and the foot rest 201 is completely folded at the lower position on the back side of the leg rest 103. The second footrest extension link 203 is supported between the leg rest 103 and the first footrest extension link 202, so that the first footrest extension link 202 is swung toward the rear side of the leg rest 103, so that the footrest 201 is more likely to be stored on the rear side of the leg rest 103.

[0051] In the embodiment of the present invention, the footrest assembly 200 is gradually unfolded outward from the storage state under the drive and constraint of the second leg link 102 and the leg support 103, so that the footrest 201 is extended outside the opened leg support 103 to provide support for the foot and provide the user with a better comfort experience. In addition, the footrest assembly 200 composed of the footrest 201, the first footrest extension link 202, the second footrest extension link 203 and the footrest link 204 can cooperate with the leg extension assembly 100. When the leg extension assembly 100 is unfolded into place, the footrest assembly 200 is also unfolded into place. The entire unfolding process is continuous and stable, ensuring that the functional seat moves smoothly during posture changes and avoiding sudden changes in speed, shaking, tilting, and jamming.

[0052] In some embodiments, see Figure 5 The leg rest 103 includes a vertical plate 1035 and a first wing plate 1036 disposed at the edge of the vertical plate 1035 and bent to one side. The vertical plate 1035 serves as the hinged location of the leg rest 103. The first leg link 101, the second leg link 102, the footrest link 204, and the second footrest extension link 203 can overlap with the leg rest 103 at the vertical plate 1035 and be hinged. That is, the first hinge point 1031, the second hinge point 1032, the third hinge point 1033, and the fourth hinge point 1034 are disposed on the vertical plate 1035. The first wing plate 1036 is used to connect to the leg support plate disposed along the width of the seat. The first wing plate 1036 can effectively increase the support area of ​​the leg rest 103 for the leg support plate, thereby improving the installation stability of the leg support plate.

[0053] In some embodiments, see Figure 5The footrest 201 includes a connecting rod 2011, the first end of which is hinged to the first footrest extension link 202, and the second end of which is provided with a second wing 2012 bent to one side. The connecting rod 2011 extends a certain length. When the footrest 201 is unfolded toward the outside of the leg rest 103 under the drive of the first footrest extension link 202 and the constraint of the footrest link 204, the angle between the connecting rod 2011 and the first footrest extension link 202 gradually increases. When the footrest 201 is close to the limit position, the extension direction of the connecting rod 2011 and the extension direction of the first footrest extension link 202 are roughly aligned, so that after unfolding, the footrest 201 can extend obliquely upward to support the leg rest 103. The second wing 2012 is used to connect to the foot support plate arranged along the width direction of the seat. The second wing 2012 can effectively increase the support area of ​​the footrest 201 for the foot support plate, thereby improving the installation stability of the leg support plate.

[0054] Further, see Figure 5 The second end 2042 of the footrest link 204 is hinged to the footrest 201 near the second wing 2012. The footrest link 204 is connected between the leg rest 103 and the footrest 201 to constrain the posture of the footrest 201 during posture switching. The footrest link 204 forms a V-shaped angle along its length. The end of the footrest link 204 connected to the footrest 201 is tilted, so that after extension, the footrest 201 can be raised obliquely above the leg rest 103. At the same time, with the support of the first footrest extension link 202 and the second footrest extension link 203, the second wing 2012 of the footrest 201 is stably limited to the highest position. Figure 1 When the seat extension device is adjusted to the sitting position, the footrest link 204 further supports the footrest 201 and confines it in the V-shaped space between the first leg link 101 and the leg rest 103, thereby achieving hidden storage and avoiding interference with the drooping calves, allowing the muscles at the bottom of the thighs to be better relaxed.

[0055] In some embodiments, see Figure 1 、 Figure 5The edge of the first leg link 101 is provided with a first limiting groove 1011. The distance between the first limiting groove 1011 and the first hinge point 1031 is equal to the distance between the second hinge point 1032 and the first hinge point 1031. In other words, the first limiting groove 1011 and the second hinge point 1032 are located on the same circumference with the first hinge point 1031 as the center. The second hinge point 1032 is provided with a first limiting block 1037. When the leg extension assembly is folded, the first limiting block 1037 engages with the first limiting groove 1011. Specifically, when the seat extension device is adjusted to the sitting position, the leg support 103 folds around the first hinge point 1031 toward the first leg link 101. The first limiting block 1037 at the second hinge point 1032 engages with the first limiting groove 1011 on the edge of the first leg link 101, achieving positioning and locking, and providing travel limit protection. When the seat extension device is unfolded outward, the leg support 103 is unfolded in the opposite direction around the first hinge point 1031, and the first limit block of the second hinge point 1032 is disengaged from the first limit groove 1011. This embodiment can fully ensure the accuracy of the seat in posture changes.

[0056] In some embodiments, see Figure 1-Figure 5 The seat extension device also includes a seat frame mounting plate 300. The seat frame mounting plate 300 is generally L-shaped, with a main portion extending in the front-to-back direction. The top of the main portion forms a mounting surface for the seat frame and seat cushion. The rear end of the seat frame mounting plate 300 extends rearward and upward, and the top portion is used to mount the seat backrest. The leg extension assembly 100 also includes a first extension link 104 and a second extension link 105. The first end 1041 of the first extension link 104 is hinged to the first position 301 in front of the seat frame mounting plate 300, and the first end 1051 of the second extension link 105 is hinged to the second position 302 in front of the seat frame mounting plate 300. The first position 301 and the second position 302 are staggered along the front-to-back direction on the seat frame mounting plate 300. The first leg link 101 is hinged to the second end 1042 of the first extension link 104. The first leg link 101 crosses the second extension link 105 and is hinged to the second extension link 105 at the crossing position. The second leg link 102 is hinged to the second end 1052 of the second extension link 105. The first extension link 104 and the second extension link 105 are hingedly connected by the first leg link 101 and the seat frame mounting plate 300 at both ends, forming a parallelogram linkage. The first leg link 101 and the second leg link 102 are hingedly connected by the second extension link 105 and the leg support 103 at both ends, forming another parallelogram linkage. The leg extension assembly 100, through these two parallelogram linkages, enables long-stroke folding and unfolding functions, meeting the functional requirements of different seat usage scenarios.

[0057] See also Figure 1-Figure 3During the process of switching the seat extension device from a sitting position to a TV position or a lying position, the first extension link 104 and / or the second extension link 105 rotate clockwise around their respective hinge points with the seat frame mounting plate 300 under the action of the driving force. During this period, the first leg link 101 and the second leg link 102 are swung outward under the drive of the first extension link 104 and the second extension link 105, and the first leg link 101 and the second leg link 102 further drive the footrest assembly 200 to expand in a clockwise direction, thereby providing support for the feet outside the leg extension assembly 100.

[0058] In some embodiments, see Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The seat extension device also includes a first driving arm 106 and a second driving arm 107. The first end 1061 of the first driving arm 106 is connected to the driving rod. The driving rod 108 is rotatably mounted on the seat frame mounting plate 300. The driving rod 108 can be further connected to the output end of a driving component such as a motor. The second end 1062 of the first driving arm 106 is hinged to the first end 1071 of the second driving arm 107. The second end 1072 of the second driving arm 107 is hinged to the second extension link 105. The first driving arm 106 and the second driving arm 107 form a crank-connecting rod structure. When the seat extension device is working, the driving component drives the driving rod 108 and drives the first driving arm rod 106 to rotate around the axis of the driving rod 108. The first driving arm rod 106 further transmits power to the second extension link 105 through the second driving arm rod 107, driving the second extension link 105 to swing around the hinge position with the seat frame mounting plate 300, and finally realizing the expansion and folding action of the entire seat extension device. This embodiment can realize the smooth movement of the functional seat during posture changes, avoiding sudden changes in speed, trembling, tilting, jamming, etc.

[0059] The first drive arm 106 and the drive rod 108 can be assembled or connected by fasteners. In some embodiments, see Figure 5 、 Figure 6The first driving arm 106 is provided with a driving rod connection hole 1063, which is a contoured hole corresponding to the cross-section of the driving rod 108. The driving rod 108 is inserted into the driving rod connection hole 1063. The first end of the first driving arm 106 is provided with a third wing plate 1064 bent in the longitudinal direction of the driving rod 108. The third wing plate 1064 is in contact with the wall surface of the driving rod 108. The third wing plate 1064 and the wall surface of the driving rod 108 are provided with fastener mounting holes 1065. The third wing plate 1064 and the wall surface of the driving rod 108 are connected to the driving rod 108 via fasteners provided in the fastener mounting holes 1065. In this embodiment, the first end of the first driving arm 106 is bent in the longitudinal direction of the driving rod 108 to form the third wing plate 1064. The third wing plate 1064 is further in contact with the wall surface of the driving rod 108, and the driving rod 108 and the third wing plate 1064 are connected via fasteners. The driving force of the driving rod 108 can be transmitted to the first driving arm 106 through the cooperation between the driving rod 108 and the contoured hole, and the cooperation between the driving rod 108 and the third wing plate 1064, thereby improving the stability of the connection between the driving rod 108 and the first driving arm 106 and extending the service life.

[0060] It is understandable that the driving component may be directly connected to the first stretching link 104 and / or the second stretching link 105 , so that the power is directly applied to the first stretching link 104 and / or the second stretching link 105 .

[0061] In some embodiments, see Figure 4The seat extension device also includes a seat frame mounting plate lifting assembly 400, which is used to adaptively adjust the seat frame mounting plate 300 during the posture adjustment process, thereby providing the user with a more comfortable sitting, leisure, sleeping and other experiences. Among them, the seat frame mounting plate lifting assembly 400 includes a bottom frame 401, a front support link 402, a rear support link 403, a front suspension 404, a rear suspension 405 and an intermediate suspension 406. The bottom frame 401 is located below the seat frame mounting plate 300 and extends in the front and rear directions. The front suspension 404 is hinged to the front of the seat frame mounting plate 300, the first end 4021 of the front support link 402 is hinged to the front suspension 404, the second end 4022 of the front support link 402 is hinged to the bottom frame 401, the rear suspension 405 is hinged to the rear of the seat frame mounting plate 300, the first end 4031 of the rear support link 403 is hinged to the rear suspension 405, the second end 4032 of the rear support link 403 is hinged to the bottom frame 401, the first end 4061 of the intermediate suspension 406 is hinged to the front suspension 404, and the second end 4062 of the intermediate suspension 406 is hinged to the rear suspension 405. The seat frame mounting plate 300 forms a multi-link articulated support structure through the bottom frame 401, the front support link 402, the rear support link 403, the front suspension 404 and the rear suspension 405, providing the seat frame mounting plate 300 with more diverse position and posture adjustment space. A specific driving force can be used to act on a specific seat frame mounting plate lifting component 400 to achieve flexible adjustment of the posture of the seat frame mounting plate 300, providing users with a more comfortable sitting, leisure, sleeping and other experiences.

[0062] Further, see Figure 2 、 Figure 4The seat frame mounting plate lifting assembly 400 also includes a transmission lever 407, a first transmission link 408 and a second transmission link 409. The middle portion of the transmission lever 407 is hinged to the seat frame mounting plate 300 to form a lever structure. When the transmission lever 407 rotates around the hinge point in the middle, the first end 4071 and the second end 4072 of the transmission lever 407 can move in opposite directions. The first end 4081 of the first transmission link 408 is hinged to the first extension link 104, the second end 4082 of the first transmission link 408 is hinged to the first end 4071 of the transmission lever 407, the first end 4091 of the second transmission link 409 is hinged to the front support link 402, and the second end 4092 of the second transmission link 409 is hinged to the transmission lever. At the second end 4072 of 407, the driving rod 108 can drive the first driving arm 106 to rotate, the first driving arm 106 further drives the second driving arm 107, the second driving arm 107 further drives the second extension link 105, the second extension link 105 further drives the first extension link 104, the first extension link 104 further drives the first transmission link 408, the first transmission link 408 further drives the transmission lever 407 to rotate around the hinge point between the transmission lever 407 and the seat frame mounting plate, the transmission lever 407 further drives the second transmission link 409, the second transmission link 409 further drives the front support link 402, and the front support link 402 further drives the seat frame mounting plate 300 to adjust its posture. In this embodiment, the seat frame mounting plate lifting assembly 400 is connected to the leg extension assembly 100 via a transmission lever 407, a first transmission link 408, and a second transmission link 409. That is, the seat frame mounting plate lifting assembly 400 and the leg extension assembly 100 share a common set of driving forces. Thus, when the seat extension device adjusts its posture, the seat frame mounting plate 300, the leg extension assembly 100, and the footrest assembly 200 are synchronously adjusted, achieving a linkage technical effect, ensuring that the posture switching of the leg extension assembly 100 and the footrest assembly 200 is synchronized with the posture adjustment of the seat frame mounting plate 300, ensuring that the posture of the seat frame mounting plate 300 is coordinated with the posture of the leg extension assembly 100 and the footrest assembly 200, and providing the user with a more comfortable experience of sitting, relaxing, sleeping, etc. At the same time, sharing a common set of driving forces can ensure that the overall structure is more concise and ingenious.

[0063] In some embodiments, see Figure 4The transmission lever 407 is located in the middle of the seat frame mounting plate 300 in the front-to-back direction, overlapping with the drive rod 108 in the width direction of the seat. The transmission lever 407 is approximately diamond-shaped and has an arcuate slot 4073 formed in the transmission lever 407. The drive rod 108 passes through the arcuate slot 4073. When the transmission lever 407 rotates about the central hinge point, the drive rod 108 moves relative to the transmission lever 407 along the arcuate slot 4073. In this embodiment, by providing the arcuate slot 4073 in the transmission lever 407 to avoid the drive rod 108, the transmission lever 407 can adopt a larger diamond-shaped design, thereby increasing the strength of the transmission lever 407.

[0064] See also Figures 6-10 The drive rod 108 is disposed between the seat frame mounting plates 300 on both sides. The seat frame mounting plates 300 are provided with drive rod mounting holes 303. The drive rod 108 is rotatably mounted in the drive rod mounting holes 303. A bushing 304 is disposed between the drive rod 108 and the drive rod mounting holes 303. The bushing 304 extends a certain length along the length of the drive rod 108. The drive rod 108 passes through the bushing 304. The bushing 304 increases the support area of ​​the seat frame mounting plates 300 for the drive rod 108, thereby reducing wear on the drive rod 108. Simultaneously, the bushing 304 is embedded in the arcuate groove 4073. The bushing 304 is located between the drive rod 108 and the arcuate groove 4073, separating the drive rod 108 from the transmission lever 407, thereby preventing wear between the transmission lever 407 and the drive rod 108.

[0065] In some embodiments, see Figure 11 The transmission lever 407 is provided with a second limit block 4074 above the middle suspension 406, and the middle suspension 406 bypasses the bottom of the second limit block 4074. The top edge of the middle suspension 406 is provided with a second limit groove 4063 that cooperates with the second limit block 4074. When the transmission lever 407 rotates to the extreme position around the hinge point in the middle, the second limit block 4074 is embedded in the second limit groove 4063 to achieve the limit of the sitting state, ensuring that the seat frame mounting plate 300 can be stably supported in the sitting state to avoid collapse.

[0066] Further, in some embodiments, see Figure 4The hinge point between the rear suspension 405 and the rear support link 403 is higher than the hinge point between the rear suspension 405 and the seat frame mounting plate 300. In other words, the top of the rear suspension 405 is hinged to the top of the rear support link 403, while the bottom of the rear suspension 405 is hinged to the seat frame mounting plate 300. The rear suspension 405 is provided with a third stopper 4051 in front of the rear support link 403, and the rear support link 403 is provided with a third stopper slot 4033 that engages with the third stopper 4051. During posture adjustment of the seat frame mounting plate 300, the angle between the rear support link 403 and the rear suspension 405 changes. The cooperation between the third stopper 4051 and the third stopper slot 4033 limits the minimum angle between the rear support link 403 and the rear suspension 405, i.e., the maximum swing position of the rear suspension 405 relative to the rear support link 403.

[0067] In some embodiments, see Figure 3 A fourth limit block 4011 is provided in front of the bottom frame 401 and the rear support link 403. When the rear support link 403 swings forward to the limit position around the hinge point at the second end, the rear support link 403 abuts the fourth limit block 4011. During the posture adjustment process of the seat frame mounting plate 300, especially when adjusting from the TV posture / sitting posture to the lying posture, when the rear support link 403 swings forward to the limit position around the hinge point at the second end, the rear support link 403 abuts the fourth limit block 4011, achieving the lying posture limit. This ensures that the seat frame mounting plate 300 is stably supported in the lying posture and prevents it from swinging forward further.

[0068] In some embodiments, see Figure 12 The front suspension 404 is provided with a fifth stopper 4041 that abuts the seat frame mounting plate 300 when it swings forward to its extreme position. In the sitting / TV posture state, the fifth stopper 4041 contacts the seat frame mounting plate 300. When the seat extension mechanism is rotated from the sitting posture to the TV posture, the fifth stopper 4041 and the seat frame mounting plate 300 remain in contact. When the seat is rotated from the TV posture to the reclining posture, the fifth stopper 4041 and the seat frame mounting plate 300 move relatively farther apart. When the seat is rotated from the reclining posture to the TV posture, the fifth stopper 4041 and the seat frame mounting plate 300 move relatively closer. In the TV posture, the fifth stopper 4041 and the seat frame mounting plate 300 contact each other. When the seat is rotated from the TV posture to the sitting posture, the fifth stopper 4041 and the seat frame mounting plate 300 remain in contact with each other until the sitting posture. This embodiment ensures the posture stability of the front suspension 404 in the sitting / TV posture state through the fifth stopper 4041 and the seat frame mounting plate 300.

[0069] In some embodiments, see Figure 4The seat extension device also includes a backrest component 500 and a backrest support rod 501. The backrest component 500 is used to connect the backrest of the seat and provide support for the backrest of the seat and an angle adjustment function on the seat frame mounting plate 300. The bottom front end of the backrest component 500 is hinged to the rear part of the seat frame mounting plate 300, and the bottom rear end of the backrest component 500 is hinged to the first end 5011 of the backrest support rod 501. The second end 5012 of the backrest support rod 501 is hinged to the rear suspension 405. The backrest component 500 can adjust its posture together with the seat frame mounting plate 300 during the posture adjustment process of the seat frame mounting plate 300, and can also rotate around the hinge position with the seat frame mounting plate 300 driven by the backrest support rod 501 and the rear suspension 405. Therefore, when the seat extension device adjusts its posture, the backrest, seat frame mounting plate 300 and leg extension component 100 and footrest component 200 are adjusted synchronously, achieving the technical effect of linkage, ensuring that the posture switching of the leg extension component 100 and the footrest component 200 is synchronized with the posture adjustment of the seat frame mounting plate 300, ensuring that the posture of the seat frame mounting plate 300 is coordinated with the posture of the leg extension component 100 and the footrest component 200, and providing users with a more comfortable sitting, leisure, sleeping and other experiences.

[0070] Further, see Figure 4 The bottom of the rear suspension 405 is provided with a tailstock 4052 extending backward, and the second end of the backrest support rod 501 is hinged to the tailstock 4052. The end of the tailstock 4052 is at a certain distance from the hinge point of the rear suspension 405 and the seat frame mounting plate 300. The rear suspension 405 forms an arm that drives the backrest support rod 501 through the tailstock 4052, so that when the rear suspension 405 rotates around the hinge point of the rear suspension 405 and the seat frame mounting plate 300, the travel range of the backrest support rod 501 is increased, thereby providing a greater angle adjustment effect for the backrest component 500.

[0071] In some embodiments, see Figure 13 The tailstock 4052 is provided with a sixth stopper 4053. When the rear suspension 405 rotates to its limit position, the sixth stopper 4053 abuts the seat frame mounting plate 300 from the rear. During the posture adjustment process of the seat extension device, particularly when adjusted to the sitting or TV posture states, the sixth stopper 4053 abuts the seat frame mounting plate 300, limiting the sitting and TV posture states and preventing over-limiting.

[0072] Further, in some embodiments, see Figure 5 , the seat frame mounting plate 300 and the tailstock 4052 are connected to a tension spring 600. The tension spring 600 is used to limit the seat extension device to a specific posture more stably, such as the TV posture state.

[0073] The present invention also provides a seat comprising the seat extension device of any of the above embodiments. The seat is generally symmetrically arranged with two or more sets of the seat extension devices of any of the above embodiments along the width direction, and the seat extension devices are synchronously linked to achieve the posture adjustment function of the seat.

[0074] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. A seat extension device, characterized in that: The invention comprises a leg extension assembly and a footrest assembly, wherein the leg extension assembly comprises a first extension link, a second extension link, a first leg link, a second leg link and a leg support, wherein the leg support is provided with a first hinge point, a second hinge point, a third hinge point and a fourth hinge point in sequence along the extension direction of the seat, the first leg link is hinged to the first hinge point of the leg support, the second leg link is hinged to the second hinge point of the leg support, the footrest assembly comprises a footrest, a first footrest extension link, a second footrest extension link and a footrest link, the first end of the footrest link is hinged to the fourth hinge point of the leg support, The second end of the footrest link is hinged to the footrest, the first end of the first footrest extension link is hinged to the second leg link, the second end of the first footrest extension link is hinged to the footrest, the first end of the second footrest extension link is hinged to the first footrest extension link, the second end of the second footrest extension link is hinged to the third hinge point of the footrest, the first leg link is hinged to the first extension link, the first leg link crosses the second extension link and is hinged to the second extension link at the crossing position, and the second leg link is hinged to the second extension link.

2. The seat extension device according to claim 1, characterized in that The leg rest includes a vertical plate and a first wing plate arranged at the edge of the vertical plate and bent to one side, the first hinge point, the second hinge point, the third hinge point and the fourth hinge point are arranged on the vertical plate. The foot rest includes a connecting rod portion, the first end of the connecting rod portion is hinged to the first footrest extension connecting rod, and the second end of the connecting rod portion is provided with a second wing plate bent to one side.

3. The seat extension device according to claim 1, characterized in that A first limiting groove is provided on the edge of the first leg connecting rod, and a first limiting block is provided at the second hinge point. After the leg extension assembly is folded, the first limiting block is embedded in the first limiting groove.

4. The seat extension device according to claim 1, characterized in that During the unfolding process of the leg extension assembly and the footrest assembly, the leg rest unfolds outwardly driven by the first leg link and the second leg link, and the leg rest drives the first footrest extension link through the second footrest extension link. The foot rest is flipped toward the outside of the leg rest under the drive of the first footrest extension link and the constraint of the footrest link, and the second footrest extension link is stretched between the leg rest and the first footrest extension link.

5. The seat extension device according to claim 1, characterized in that During the folding process of the leg extension assembly and the footrest assembly, the leg rest is folded and retracted under the drive of the first leg link and the second leg link, and the leg rest pushes the first footrest extension link through the second footrest extension link. The foot rest is folded toward the inside of the leg rest under the drive of the first footrest extension link and the constraint of the footrest link, and the second footrest extension link is supported between the leg rest and the first footrest extension link.

6. The seat extension device according to claim 1, characterized in that The seat extension device also includes a seat frame mounting plate, the first extension link is hinged to a first position at the front of the seat frame mounting plate, the second extension link is hinged to a second position at the front of the seat frame mounting plate, and the first position and the second position are staggered along the front-to-back direction on the seat frame mounting plate.

7. The seat extension device according to claim 6, characterized in that The seat extension device also includes a first driving arm and a second driving arm, the first end of the first driving arm is connected to the driving rod, the driving rod is rotatably mounted on the seat frame mounting plate, the second end of the first driving arm is hinged to the first end of the second driving arm, and the second end of the second driving arm is hinged to the second extension link.

8. The seat extension device according to claim 7, characterized in that The seat extension device also includes a seat frame mounting plate lifting assembly, which includes a bottom frame, a front support link, a rear support link, a front suspension, a rear suspension and an intermediate suspension, the front suspension being hinged to the front portion of the seat frame mounting plate, the first end of the front support link being hinged to the front suspension, the second end of the front support link being hinged to the bottom frame, the rear suspension being hinged to the rear portion of the seat frame mounting plate, the first end of the rear support link being hinged to the rear suspension, the second end of the rear support link being hinged to the bottom frame, the first end of the intermediate suspension being hinged to the front suspension, and the second end of the intermediate suspension being hinged to the rear suspension.

9. The seat extension device according to claim 8, characterized in that The seat frame mounting plate lifting assembly also includes a transmission lever, a first transmission link and a second transmission link. The middle part of the transmission lever is hinged to the seat frame mounting plate, the first end of the first transmission link is hinged to the first extension link, the second end of the first transmission link is hinged to the first end of the transmission lever, the first end of the second transmission link is hinged to the front support link, and the second end of the second transmission link is hinged to the second end of the transmission lever.

10. The seat extension device according to claim 9, characterized in that The transmission lever is provided with an arcuate slot, and the drive rod passes through the arcuate slot. When the transmission lever rotates around the hinge point in the middle, the drive rod moves relative to the transmission lever along the arcuate slot.

11. The seat extension device according to claim 10, characterized in that The seat frame mounting plate is provided with a drive rod mounting hole, the drive rod is rotatably mounted in the drive rod mounting hole, a bushing is provided between the drive rod and the drive rod mounting hole, and the bushing is embedded in the arc groove.

12. The seat extension device according to claim 9, characterized in that The transmission lever is provided with a second limit block above the middle suspension, and the top edge of the middle suspension is provided with a second limit groove that cooperates with the second limit block. When the transmission lever rotates around the middle hinge point to the extreme position, the second limit block is embedded in the second limit groove.

13. The seat extension device according to claim 8, characterized in that The hinge position of the rear suspension and the rear support link is higher than the hinge position of the rear suspension and the seat frame mounting plate. The rear suspension is provided with a third limit block in front of the rear support link, and the rear support link is provided with a third limit groove that cooperates with the third limit block.

14. The seat extension device according to claim 8, characterized in that A fourth limiting block is provided in front of the bottom frame and the rear supporting link. When the rear supporting link swings forward to an extreme position around the hinge point at the second end, the rear supporting link abuts against the fourth limiting block.

15. The seat extension device according to claim 8, characterized in that The front suspension is provided with a fifth limiting block which abuts against the seat frame mounting plate when the front suspension swings forward to an extreme position.

16. The seat extension device according to claim 8, characterized in that The seat extension device also includes a backrest component and a backrest support rod, the bottom front end of the backrest component is hinged to the rear part of the seat frame mounting plate, the bottom rear end of the backrest component is hinged to the first end of the backrest support rod, and the second end of the backrest support rod is hinged to the rear suspension.

17. The seat extension device according to claim 16, characterized in that A tailstock extending backward is provided at the bottom of the rear suspension, and the second end of the backrest support rod is hinged to the tailstock.

18. The seat extension device according to claim 17, characterized in that The seat frame mounting plate and the tailstock are connected to a tension spring.

19. The seat extension device according to claim 17, wherein: The tailstock is provided with a sixth limiting block. When the rear suspension rotates to the limit position, the sixth limiting block abuts against the seat frame mounting plate from the rear side.

20. The seat extension device according to claim 7, characterized in that The first driving arm is provided with a driving rod mounting hole, and the driving rod is inserted into the driving rod mounting hole. The first end of the first driving arm is provided with a third wing plate bent in the length direction of the driving rod, and the third wing plate is in contact with the wall surface of the driving rod. The third wing plate and the wall surface of the driving rod are provided with fastener mounting holes, and the third wing plate and the driving rod are connected by fasteners arranged in the fastener mounting holes.

21. A seat, characterized in that: The invention comprises the seat extension device according to any one of claims 1 to 20.

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