Extended seat frames and furniture

Abstract

The present invention discloses an extension type seat frame and furniture. The extension type seat frame includes a seat frame main body (1), a hidden extension mechanism (2), and a fixed base (3). The seat frame main body (1) is installed above the fixed base (3) so as to be relatively movable. The hidden extension mechanism (2) is pivotally connected to the fixed base (3) and also to the seat frame main body (1), thereby switching the extension type seat frame between a stored state and an extended state. The hidden extension mechanism (2) includes an extension part (21). One end of the extension part (21) is pivotally connected to one end of the seat frame main body (1) that is away from the extension direction, so that the seat frame main body (1) reverses the extension part (21) when it moves in the extension direction. By fitting this seat frame body (1) to the reversible extension part (21), the extension distance of the seat frame body (1) is increased and the rear extension part (21) is reversed to fill in the gap formed by the movement of the seat frame body (1), resulting in excellent comfort and high safety.

Description

[Technical Field]

[0001] The present invention relates to the technical field of smart homes, and in particular to extended seat frames and furniture. [Background technology]

[0002] As people's needs for smart homes continue to grow, the seat frames of commercially available furniture, such as sofas and seats, are often equipped with adjustable structures to accommodate various user needs for seat frame positioning. However, the movement distance of conventional seat frames is limited, and some seats often have a footrest-like structure added to the front of the seat frame to extend the cushion length, but this structure cannot meet various user needs for cushion length. Furthermore, after the seat frame is extended, a large gap is created between the rear of the seat frame and the back frame, which is uncomfortable and may pose a safety risk to the user. Furthermore, in conventional seat frame adjustments, the position of the seat frame is often adjusted manually by the user, which is time-consuming and laborious, resulting in user inconvenience.

[0003] Therefore, there is a need for an extendable seat frame and furniture that significantly increases the extension distance of the seat frame body, and that reverses the rear extension of the seat frame body as the seat frame body extends, filling in the gap created by the movement of the seat frame body, allowing for smooth and easy movement, improved seating comfort, and increased safety. Summary of the Invention [Problem to be solved by the invention]

[0004] In response to the above-mentioned problems of the prior art, the present invention provides an extension-type seat frame and furniture, which significantly increases the extension distance of the seat frame body, and at the same time as the seat frame body advances, the rear extension part of the seat frame body is reversed, filling the gap created by the movement of the seat frame body, making movement smoother and easier, more comfortable, and safer. [Means for solving the problem]

[0005] The extension-type seat frame according to the present invention includes a seat frame main body, a hidden extension mechanism, and a fixed base. The seat frame main body is installed above the fixed base so as to be relatively movable. The hidden extension mechanism is pivotally connected to the fixed base and also to the seat frame main body, thereby switching the extension-type seat frame between a stowed state and an extended state. The hidden extension mechanism includes at least an extension portion. One end of the extension portion is pivotally connected to one end of the seat frame main body that is away from the extension direction, so that the extension portion is reversed when the seat frame main body moves in the extension direction.

[0006] Furthermore, the length of the extension is 200 to 350 mm.

[0007] Furthermore, the maximum movement distance of the seat frame body is 450 to 600 mm.

[0008] Furthermore, the hidden extension mechanism further includes at least one carousel, which is pivotally connected to the extension portion, and which is further pivotally connected to the fixed base.

[0009] Furthermore, at least one pivotal connection unit is installed at the connection point between the extension and the seat frame main body. The pivotal connection unit includes a first connection member and a second connection member. The first connection member is fixed to an end surface of the seat frame main body. The second connection member is fixed to the extension. The first connection member and the second connection member are pivotally connected in a one-to-one relationship.

[0010] Furthermore, the second connecting member is an L-shaped member, one side of which is fixed to the extension portion and the other side of which is rotatably connected to the first connecting member.

[0011] Furthermore, at least one third connecting member is further fixedly installed on the extension portion, and the third connecting member and the rotary rack are rotatably connected in a one-to-one relationship.

[0012] Furthermore, the second connecting member and the third connecting member are both integral with the extension portion.

[0013] Furthermore, the second connecting member has a groove structure, the groove structure is located on an end surface of the extension portion, the first connecting member is inserted into the groove structure, and the groove structure is rotatable relative to the first connecting member.

[0014] The extension type seat frame further includes a drive mechanism, the drive mechanism being installed on the fixed base, and an output end of the drive mechanism being movably connected to the seat frame main body to move the seat frame main body.

[0015] Preferably, a sliding mechanism is installed between the seat frame main body and the fixed base. The sliding mechanism includes a slide rail unit and a sliding unit that are slidably installed relative to each other. The top of the sliding unit is fixedly connected to the seat frame main body. The driving mechanism is drivingly connected to the slide rail unit to slide the sliding unit relative to the slide rail unit.

[0016] Furthermore, the slide rail unit includes a first guide rail and at least one second guide rail. The slide unit includes a first slide member and at least one second slide member. An output end of the drive mechanism is connected to the first guide rail, causing the first slide member to slide relative to the first guide rail. The first slide member is fixedly connected to the second slide member, and a top portion of the second slide member is fixedly connected to the seat frame main body, causing the second slide member to slide back and forth together with the seat frame main body along the extension direction.

[0017] Furthermore, a telescopic push lever is installed between the seat frame main body and the fixed base. The telescopic push lever includes a telescopic portion and a fixed portion that are telescopically connected. One end of the telescopic portion is connected to the seat frame main body. One end of the fixed portion is connected to the drive mechanism. The drive mechanism moves the telescopic portion telescopically relative to the fixed portion.

[0018] The present invention further provides furniture, including a first cushion, a second cushion, and the aforementioned extended seat frame. The first cushion is installed above the seat frame body. The second cushion is installed above the extension. The upper surface of the first cushion is located on the same horizontal plane as the upper surface of the second cushion.

[0019] The present invention has the following beneficial effects. 1. In this invention, a reversible extension is added to the rear of the seat frame body, which significantly increases the extension distance of the seat frame body. When the seat frame body is extended, the rear extension is reversed at the same time, filling the gap created when the seat frame body is extended, making movement smooth and easy, providing excellent comfort and safety. Furthermore, since the extension can be hidden behind the seat frame body in the stowed state, it takes up less space, improving space utilization and facilitating user storage. 2. In the present invention, a rotating rack is installed between the extension part and the fixed base to rotatably connect the extension part and the fixed base, so that the extension part can rotate freely as the seat frame body is extended, making extension easy and providing excellent rotation stability. 3. The first sliding member is driven by the driving mechanism to slide and cause the second sliding member to slide, i.e., the second sliding member plays the role of sliding assist. Furthermore, the combination of active and passive sliding allows the sliding direction of the seat frame body to be limited by multiple sliding structures, resulting in high sliding stability, easy adjustment, and excellent flexibility. [Brief explanation of the drawings]

[0020] In order to more clearly explain the technical solution of the present invention, the drawings used in the embodiments will be briefly described below, and the same parts will be designated by the same drawing symbols. In addition, the drawings in the following description only show some embodiments of the present invention, and it is clear that those skilled in the art can obtain other related drawings based on these drawings without any creative work. [Figure 1] 1 is a diagram showing the configuration of an extension-type seat frame according to the present invention in a stored state. FIG. [Figure 2] 1 is a diagram showing the configuration of an extension-type seat frame according to the present invention in an extended state. FIG. [Figure 3] 2 is a diagram showing the connection relationship between the seat frame main body and the hidden extension mechanism in FIG. 1 in a stored state. [Figure 4] 2 is a diagram showing the connection relationship between the seat frame main body and the hidden extension mechanism in FIG. 1 in an extended state. [Figure 5] FIG. 10 is a diagram showing the configuration of a sliding mechanism in a retracted state according to one possible embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, a clear and complete description of the technical solutions in the embodiments of the present invention will be provided in conjunction with the drawings in the embodiments of the present invention. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "both ends," "one end," and "the other end" are based on the orientations or positional relationships shown in the drawings. These terms are primarily used to facilitate the description of the present invention and are not intended to indicate or suggest that the devices or structures shown have a specific orientation or must be configured and operated in a specific orientation. It is clear that the described embodiments are only a portion of the embodiments of the present invention, and do not represent all of the embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without the need for creative labor are all within the scope of protection of the present invention.

[0022] Example This embodiment provides an extendable seat frame. As shown in FIGS. 1 to 5 of the specification, this extendable seat frame includes a seat frame main body 1, a hidden extension mechanism 2, and a fixed base 3. The seat frame main body 1 is installed above the fixed base 3 so as to be relatively movable. The hidden extension mechanism 2 is rotatably connected to the seat frame main body 1 and also to the fixed base 3, allowing the extendable seat frame to be switched between a stowed state and an extended state. The process shown in FIGS. 1 and 2 of the specification can be considered as the extendable seat frame switching from a stowed state to a fully extended state. In this embodiment, the hidden extension mechanism 2 has a reversible structure. In the stowed state, it is hidden between the seat frame main body and the seat back frame, occupying little space and facilitating user storage and organization. In the extended state, it can be reversed to a nearly horizontal position. By fitting it to the seat frame main body 1, the length of the entire seat frame structure is extended, preventing the occurrence of gaps behind the seat frame main body, providing a comfortable seating experience for the user and high safety in use.

[0023] Specifically, as shown in FIGS. 1 and 2, the hidden extension mechanism 2 includes one extension 21 and two rotating racks 22. As shown in FIG. 1, the extension 21 is stored behind the seat frame main body 1 in the stored state and may be arranged vertically or at a certain angle relative to the vertical direction depending on actual space limitations. As shown in FIGS. 1 and 2, if the seat frame main body 1 is movable in the extension direction and the extension 21 is pivotally connected to one end of the seat frame main body 1 that is away from the extension direction, the extension 21 can be rotated simultaneously with the rotation of the seat frame main body 1. Finally, as shown in FIG. 2, when the seat frame main body 1 moves to the final extension state, the extension 21 also reverses to the fully extended state, i.e., the extension-type seat frame switches to the extension state. In addition, in one possible embodiment of the present specification, the extension 21 is arranged parallel to the seat frame main body 1 in the extended state to ensure the balance of the entire seat frame structure. In addition, in another possible embodiment of this specification, in order to further improve the stability and comfort of the support, the extension portion 21 may be installed at an inclination angle of 1° to 3° with respect to the plane on which the seat frame main body 1 is located, and the end of the extension portion 21 that is away from the seat frame main body may be higher than the end of the extension portion 21 that is connected to the seat frame main body 1.

[0024] Specifically, this extendable seat frame may be applied to a sofa or seat. In one possible embodiment of this specification, the overall depth of the sofa, i.e., the depth of the armrest, may be set to 900 to 1000 mm. Depending on the depth of the sofa, the length of the extension portion 21 in the extension direction may be set to 200 to 350 mm. This ensures that the extension portion has sufficient length to fill the gap formed after the seat frame main body 1 is extended, preventing the user from sinking into the gap when leaning back, and alleviating discomfort caused by insufficient support for the user's lower back. Meanwhile, an overly long extension portion 21 can be prevented from hitting the internal structure or the ground when retracted, thereby extending the service life of the extendable seat frame. In one possible embodiment of this specification, the depth of the armrest is preferably 950 mm, and the length of the extension portion 21 may be 280 mm, providing excellent comfort and high user satisfaction.

[0025] Specifically, each rotary rack 22 is rotatably connected to the extension 21 and also to the fixed base 3, so that the extension 21 is not restricted in its rotation and can freely rotate in accordance with the movement of the seat frame main body 1. Furthermore, two rotary racks 22 are installed on either side of the extension 21, respectively, to ensure balance and stability when the extension 21 rotates. In one possible embodiment of the present specification, only one rotary rack 22 may be installed to reduce material costs while still satisfying support strength and structural stability.

[0026] As shown in FIGS. 3 and 4 of the specification, the rotating rack 33 may be installed in a bent structure, with both ends of the rotating rack 22 positioned on the same plane, and the bent portion of the rotating rack 22 pivotally connected to the extension 21. As shown in FIG. 3, based on the direction shown in this drawing, the bent portion of the rotating rack 22 bends downward to be pivotally connected to the end of the extension 21 that is away from the seat frame body 1, and the portion of the rotating rack 22 other than the bent portion forms a retractable portion. The retractable portion is positioned higher than the end of the bent portion in the storage state, ensuring that other conventional structures in the furniture can be efficiently retracted and not obstruct the extension 21 when it is stored, facilitating storage for the user. In other embodiments of the specification, the rotating rack 22 may be installed in a straight lever-like configuration, but the present invention is not limited to this configuration. It is sufficient that the rotating rack 22 does not collide with or interfere with surrounding structures when stored.

[0027] Specifically, at least one pair of pivotal connection units for pivotally connecting the extension portion 21 and the seat frame main body 1 is further installed at the connection point between the extension portion 21 and the seat frame main body 1. As shown in FIGS. 3 and 4 of the specification, this pivotal connection unit includes a first connection member 11 and a second connection member 210. The first connection member 11 is fixed to an end face of the seat frame main body 1. The second connection member 210 is fixed to the extension portion 21. The first connection member 11 and the second connection member 210 are pivotally connected in a one-to-one relationship. This achieves the pivotal connection between the extension portion 21 and the seat frame main body 1. In this embodiment, two pairs of pivotal connection members are installed. One pin is installed between the first connection member 11 and the second connection member 210 of each pair. This pin passes through both the first connection member 11 and the second connection member 210. As a result, both the first connecting member 11 and the second connecting member 210 are rotatable around this pin, allowing for smooth rotation and preventing snagging.

[0028] Specifically, in one possible embodiment of the present specification, the second connecting member 210 is installed as a bent L-shaped member. One side of this L-shaped member is fixedly connected to the extension portion 21, providing a large contact area and a stable connection. The other side of this L-shaped member is rotatably connected to the first connecting member 11, providing a simple structure and smooth rotation.

[0029] Specifically, as shown in FIG. 4 of the specification, a third connecting member 211 is further fixedly installed on the extension 21. This third connecting member 211 is rotatably connected to the rotating rack 22. The number of third connecting members 211 is the same as the number of rotating racks 22 installed, thereby achieving stable rotation of the extension 21 and the rotating rack 22. In one possible embodiment of the specification, the second connecting member 210 and the extension 21 may be installed as an integral structure, or the third connecting member 211 and the extension 21 may be installed as an integral structure. Furthermore, the second connecting member 210, the third connecting member 211, and the extension 21 may be installed as an integral structure, thereby reducing the number of assembly parts and improving assembly and manufacturing efficiency.

[0030] Specifically, in another possible embodiment of the present specification, the second connecting member 210 may be directly installed as a groove structure. That is, the second connecting member 210 is formed by cutting into the end surface of the extension portion 21. In this case, the groove structure is located on the end surface of the extension portion 21, and the first connecting member 11 is inserted into the groove structure, which is rotatable relative to the first connecting member 11. This further simplifies the structure, reduces the number of parts required for assembly, and reduces costs. Furthermore, the pin between the first connecting member 11 and the second connecting member 210 may be a structure on the body of the extension portion 21. That is, when the groove structure is cut, two pin-shaped protrusions are reserved on both sides of the groove structure, and these pin-shaped protrusions are simply rotatably connected to the first connecting member 11, making the structure simpler and rotation easier. Furthermore, because the groove structure is an integral structure with the extension portion 21, parts are less likely to loosen and rotation stability is excellent.

[0031] Specifically, this extension type seat frame further includes a drive mechanism 4. As shown in Figures 1 and 5, this drive mechanism 4 is installed on a fixed base 3, and the output end of the drive mechanism 4 is connected to the seat frame main body 1 so as to be relatively movably connected thereto, thereby causing the seat frame main body 1 to reciprocate in the extension direction, thereby switching the extension type seat frame between a stowed state and an extended state. This eliminates the need for the user to manually pull the seat frame main body 1, which is convenient and labor-saving, and increases user satisfaction. In one possible embodiment of this specification, the drive mechanism 4 may be installed as a drive motor, which occupies a small space, has sufficient power, and has a long service life.

[0032] Specifically, as shown in FIG. 5 of the specification, a sliding mechanism is installed between the seat frame main body 1 and the fixed base 3. This sliding mechanism includes a slide rail unit 5 and a slide unit 6. The top of the slide unit 6 is fixedly connected to the seat frame main body 1. The slide rail unit 5 and the slide unit 6 are installed to be slidable relative to each other. The slide rail unit 5 and the drive mechanism 4 are fixedly connected to each other. As a result, when the slide unit 6 slides relative to the slide rail unit 5, it can slide the seat frame main body 1 relative to the fixed base 3 in the extension direction.

[0033] Specifically, as shown in FIG. 5 of the specification, the slide rail unit 5 includes a first guide rail 51 and two second guide rails 52. The second guide rails 52 are located on both sides of the first guide rail 51 and are installed parallel to the first guide rail 51 to provide guide support. The extension direction of the first guide rail 51 and the second guide rail 52 is the same as the extension direction, which limits the sliding direction of the seat frame body 1 and ensures that the components inside the slide unit 6 slide along the extension direction, preventing jamming or sticking during sliding. The two second guide rails 52, located on both sides, efficiently perform a balancing function, maintaining the balance of the center of gravity of the entire slide rail unit 5 and contributing to improved overall stability.

[0034] Specifically, the sliding unit 6 includes a first sliding member 61 and two second sliding members 62. The first sliding member 61 is driven by the driving mechanism 4 to slide back and forth along the extension direction of the first guide rail 51. The second sliding member 62 is fixedly connected to the first sliding member 61. As a result, when the first sliding member 61 is driven to move, the second sliding member 62 slides along the first sliding member 61, thereby sliding along the second guide rail 52. In addition, to prevent deviation in the sliding direction, the second sliding member 62 is in sliding contact with the second guide rail 52 one-to-one, ensuring that the sliding direction of the second sliding member 62 moves back and forth along the extension direction of the second guide rail 52, i.e., the extension direction. In this sliding mechanism, the first guide rail 51 and the first sliding member 61 act as an active slide set and are driven by the driving mechanism 4 to actively slide relative to each other. Meanwhile, the second guide rail 52 and the second sliding member 62 are driven to slide relative to each other as a sliding support set. A support part for fixedly connecting the second sliding member 62 to the seat frame main body 1 is further installed at the top of the second sliding member 62. As a result, the first sliding member 61 and the second sliding member 62 mate with each other to slide the seat frame main body 1 back and forth, ensuring balance and stability.

[0035] Specifically, in one possible embodiment of the present specification, a telescopic push lever is installed between the seat frame main body 1 and the fixed base 3. This telescopic push lever includes a telescopic portion and a fixed portion that are telescopically connected. One end of the telescopic portion is connected to the seat frame main body 1, and one end of the fixed portion is connected to the drive mechanism 4. When the drive mechanism 4 outputs power, the telescopic portion can move telescopically relative to the fixed portion, moving the seat frame main body 1 relative to the fixed base 3.

[0036] Specifically, in one possible embodiment of this specification, the maximum extendable movement distance of the seat frame main body 1 is 450 to 600 mm. That is, the position of the seat frame main body 1 in the extended state is 450 to 600 mm forward of the position of the seat frame main body 1 in the stored state, significantly increasing the extension distance and meeting user needs for various seat frame lengths. In another possible embodiment of this specification, this maximum movement distance may be 500 mm, and this movement distance is not limited in the present invention. More seat frame main bodies 1 with different extension distances may be installed according to actual needs.

[0037] This embodiment further provides furniture including a first cushion, a second cushion, and the aforementioned extension-type seat frame. The first cushion is installed above the seat frame main body 1, and the second cushion is installed above the extension part 21. In the stored state, the second cushion is disposed behind the seat frame main body 1 together with the extension part 21. In the extended state, the upper surface of the first cushion is located on the same horizontal plane as the upper surface of the second cushion. This ensures the flatness of the entire cushion, providing excellent comfort during use.

[0038] According to this example, it is clear that the present invention has the following beneficial effects. 1. In this invention, a reversible extension is added to the rear of the seat frame body, which significantly increases the extension distance of the seat frame body. When the seat frame body is extended, the rear extension is reversed at the same time, filling the gap created when the seat frame body is extended, making movement smooth and easy, providing excellent comfort and safety. Furthermore, since the extension can be hidden behind the seat frame body in the stowed state, it takes up less space, improving space utilization and facilitating user storage. 2. In the present invention, a rotating rack is installed between the extension part and the fixed base to rotatably connect the extension part and the fixed base, so that the extension part can rotate freely as the seat frame body is extended, making extension easy and providing excellent rotation stability. 3. The first sliding member is driven by the driving mechanism to slide and cause the second sliding member to slide, i.e., the second sliding member plays the role of sliding assist. Furthermore, the combination of active and passive sliding allows the sliding direction of the seat frame body to be limited by multiple sliding structures, resulting in high sliding stability, easy adjustment, and excellent flexibility. The above description is only a part of the embodiments of the present invention, and is not intended to limit the present invention. Those skilled in the art can make various changes and improvements to the present invention. Any modifications, equivalent replacements, and improvements based on the present invention are all included in the protection scope of the present invention. [Explanation of symbols]

[0039] 1 Seat frame body 11 First connecting member 2 Hidden extension mechanism 21 Extension 210 Second connecting member 211 Third connecting member 22 Carousel 3 Fixed base 4 Drive mechanism 5 Slide rail unit 51 First guide rail 52 Second guide rail 6 Sliding unit 61 first sliding member 62 second sliding member

Claims

1. An extended seat frame, The seat frame includes a seat frame body (1), a hidden extension mechanism (2), and a fixed base (3), The seat frame body (1) is installed above the fixed base (3) so as to be relatively movable; The hidden extension mechanism (2) has a reversible structure and is hidden between the seat frame body (1) and the backrest frame in the stored state. The hidden extension mechanism (2) is rotatably connected to the fixed base (3) and also to the seat frame main body (1), thereby switching the extension-type seat frame between a stored state and an extended state; The hidden extension mechanism (2) includes at least an extension portion (21), One end of the extension portion (21) is rotatably connected to one end of the seat frame main body (1) that is away from the extension direction, so that the seat frame main body (1) reverses the extension portion (21) when it moves in the extension direction, The hidden extension mechanism (2) further includes two carousels (22); The carousel (22) is pivotally connected to the extension (21), The carousel (22) is further pivotally connected to the fixed base (3), The two carousels (22) are installed on both sides of the extension (21), respectively.

2. 2. The extended seat frame according to claim 1, wherein the length of the extension (21) is 200 to 350 mm.

3. The extension type seat frame according to claim 1, characterized in that the maximum movement distance of the seat frame body (1) is 450 to 600 mm.

4. At least one pivotal connection unit is provided at the connection point between the extension portion (21) and the seat frame main body (1); The pivotal connection unit includes a first connection member (11) and a second connection member (210); The first connecting member (11) is fixed to an end surface of the seat frame main body (1), The second connecting member (210) is fixed to the extension portion (21), 2. The extension type seat frame according to claim 1, wherein the first connecting member (11) and the second connecting member (210) are pivotally connected in a one-to-one relationship.

5. The second connecting member (210) is an L-shaped member, The extension type seat frame according to claim 4, wherein one side of the L-shaped member is fixed to the extension portion (21) and the other side is rotatably connected to the first connecting member (11).

6. At least one third connecting member (211) is further fixedly installed on the extension portion (21); 5. The extension type seat frame according to claim 4, wherein the third connecting member (211) and the rotary rack (22) are rotatably connected in a one-to-one relationship.

7. The extended seat frame according to claim 6, wherein the second connecting member (210) and the third connecting member (211) are both integral with the extension portion (21).

8. The second connecting member (210) has a groove structure; The groove structure is located on the end surface of the extension (21); The first connecting member (11) is inserted into the groove structure, The extension type seat frame according to claim 4, wherein the groove structure is rotatable relative to the first connecting member (11).

9. further comprising a drive mechanism (4); The drive mechanism (4) is installed on the fixed base (3), The extension-type seat frame according to claim 1, characterized in that the output end of the drive mechanism (4) is connected to the seat frame main body (1) so as to be able to move relatively thereto, thereby moving the seat frame main body (1).

10. A sliding mechanism is installed between the seat frame body (1) and the fixed base (3), The sliding mechanism includes a slide rail unit (5) and a sliding unit (6) that are slidably installed relative to each other; The top of the sliding unit (6) is fixedly connected to the seat frame body (1), The extension type seat frame according to claim 9, characterized in that the drive mechanism (4) is drivingly connected to the slide rail unit (5) to slide the sliding unit (6) relative to the slide rail unit (5).

11. The slide rail unit (5) includes a first guide rail (51) and at least one second guide rail (52); The sliding unit (6) includes a first sliding member (61) and at least one second sliding member (62); The output end of the drive mechanism (4) is connected to the first guide rail (51), thereby causing the first sliding member (61) to slide relative to the first guide rail (51); 11. The extension-type seat frame according to claim 10, wherein the first sliding member (61) is fixedly connected to the second sliding member (62), and a top portion of the second sliding member (62) is fixedly connected to the seat frame main body (1), thereby allowing the second sliding member (62) to slide back and forth along the extension direction together with the seat frame main body (1).

12. A telescopic push lever is installed between the seat frame body (1) and the fixed base (3), The telescopic push lever includes a telescopic portion and a fixed portion that are telescopically connected to each other, One end of the extension / contraction portion is connected to the seat frame main body (1), One end of the fixed part is connected to the drive mechanism (4), The extension type seat frame according to claim 9, characterized in that the drive mechanism (4) moves the telescopic part telescopically relative to the fixed part.

13. Furniture, a first cushion, a second cushion, and an extended seat frame according to any one of claims 1 to 12; The first cushion is installed above the seat frame body (1), The second cushion is installed above the extension (21), A piece of furniture characterized in that an upper surface of the first cushion is located on the same horizontal plane as an upper surface of the second cushion.

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