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] Currently, as people's needs for smart homes are becoming more and more, in furniture such as sofas and seats on the market, the seat frames are often installed as movable structures to meet various people's needs for the position of the seat frame. However, the movement distance of the conventional seat frame is limited, and in order to extend the length of the cushion of some seats, a structure such as a footrest is often added to the front of the seat frame, but this structure cannot meet the various needs of users for the length of the cushion. In addition, after the seat frame is extended, a large gap is generated between the rear of the seat frame and the frame at the back, which is uncomfortable and may pose a risk to the safety of the user. In addition, the position adjustment of the seat frame in the conventional technology is often performed manually by the user, which takes time and effort and is not convenient for the user.

[0003] Therefore, there is a demand for an extension type seat frame and furniture, which greatly increases the extension distance of the seat frame body, and at the same time, when the seat frame body is extended, the rear extension part of the seat frame body is reversed, filling the gap formed by the movement of the seat frame body, making the movement smooth and easy, providing a comfortable seating experience, and high 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 reverses the rear extension part of the seat frame body as the seat frame body advances, filling in the gap formed 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 stored 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 seat frame main body reverses the extension portion when it 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 rotating rack, the rotating rack being pivotally connected to the extension portion, and the rotating rack being further pivotally connected to the fixed base.

[0009] Furthermore, at least one pivot connection unit is installed at a connection point between the extension and the seat frame main body. The pivot 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, 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 connected to the seat frame body so as to be relatively movable, thereby moving the seat frame body.

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

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

[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 part and a fixed part that are telescopically connected. One end of the telescopic part is connected to the seat frame main body. One end of the fixed part is connected to the drive mechanism. The drive mechanism moves the telescopic part telescopically relative to the fixed part.

[0018] The present invention further provides a piece of furniture, comprising a first cushion, a second cushion, and the above-mentioned extended seat frame. The first cushion is disposed above the seat frame body. The second cushion is disposed above the extension. The upper surface of the first cushion is located in the same horizontal plane as the upper surface of the second cushion.

[0019] The present invention has the following beneficial effects: 1. In the present invention, a reversible extension is added to the rear of the seat frame body, which can greatly increase the extension distance of the seat frame body, and at the same time as the seat frame body is extended, the rear extension is reversed to fill the gap formed when the seat frame body moves to the extended state, making the movement smooth and easy, comfortable, and safe. In addition, the extension can be hidden behind the seat frame body in the stored state, so it takes up less space, improves space utilization, and makes it easier for the user to store it. 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 rotational stability. 3. The first sliding member is driven by the driving mechanism to slide and cause the second sliding member to slide, that is, the second sliding member plays the role of sliding assistance. In addition, the combination of the active slide and the passive slide limits the sliding direction of the seat frame body through multiple sliding structures, which provides high sliding stability, easy adjustment and excellent flexibility. [Brief description of the drawings]

[0020] In order to more clearly describe the technical solution of the present invention, the drawings used in the embodiments will be briefly described below, and the same parts are 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 obvious that a person skilled in the art can obtain other related drawings based on these drawings without creative labor. [Figure 1] FIG. 2 is a diagram showing the configuration of the extension-type seat frame according to the present invention in a stored state. [Diagram 2] FIG. 2 is a diagram showing the configuration of the extension type seat frame according to the present invention in an extended state. [Diagram 3] 2 is a diagram showing a 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 a connection relationship between the seat frame main body and the hidden extension mechanism in FIG. 1 in an extended state. FIG. [Diagram 5] FIG. 13 is a diagram showing a configuration of a sliding mechanism in a stored state according to one possible embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely in accordance 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 "other end" are based on the orientations or positional relationships shown in the drawings. These terms are mainly for the purpose of easily explaining the present invention, and are not intended to indicate or suggest that the devices or structures shown have a specific orientation or must be constructed and operated in a specific orientation. It is clear that the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without performing creative labor all belong to the scope of protection of the present invention.

[0022] Working Example This embodiment provides an extended type seat frame. As shown in Figs. 1-5 of the specification, this extended type seat frame includes one 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 seat frame main body 1 and also to the fixed base 3, so that this extended type seat frame can be switched between a stored state and an extended state. What is shown in Figs. 1-2 of the specification may be regarded as the process of this extended type seat frame switching from a stored state to a fully extended state. In this embodiment, the hidden extension mechanism 2 has a reversible structure, which is hidden between the seat frame main body and the backrest frame in the stored state, occupies a small space, and facilitates the user's storage and arrangement, and can be reversed to a nearly horizontal state in the extended state, and can be aligned with the seat frame main body 1 to extend the length of the entire seat frame structure, avoiding the occurrence of a gap behind the seat frame main body, providing excellent comfort when the user leans back, and high safety in use.

[0023] Specifically, as shown in FIG. 1-FIG. 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 to the vertical direction depending on the actual space restrictions. As shown in FIG. 1-FIG. 2, when 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 pivoted at the same time as the seat frame main body 1 pivots. 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, that is, the extended seat frame switches to the extended state. Also, 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 so as to ensure the balance of the entire seat frame structure. In addition, in another possible embodiment of the present 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 away from the seat frame main body may be higher than the end of the extension portion 21 connected to the seat frame main body 1.

[0024] Specifically, this extension type seat frame may be applied to a sofa or a seat. In one possible embodiment of this specification, the depth of the entire sofa, that is, the depth of the armrest, may be set to 900 to 1000 mm. Depending on the depth of this sofa, the length of the extension part 21 in the extension direction may be set to 200 to 350 mm. This ensures that the extension part has a sufficient length, compensates for the gap formed after the seat frame main body 1 is extended, and prevents the user from sinking into the gap when leaning, and also reduces the discomfort caused by the user's lower back being insufficiently supported. Meanwhile, it is possible to prevent the extension part 21, which is too long, from hitting the internal structure or the ground when it is stored, and to extend the service life of this extension type seat frame. In addition, in one possible embodiment of this specification, the depth of the armrest is preferably 950 mm, and the length of the extension part 21 may be 280 mm, which is comfortable and has a high level of user satisfaction.

[0025] Specifically, each rotating 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, the two rotating racks 22 are installed on both sides of the extension 21, respectively, to ensure balance and stability when the extension 21 rotates. Also, in one possible embodiment of the present specification, only one rotating rack 22 may be installed to reduce material costs while satisfying the strength of the support and the stability of the structure.

[0026] Also, as shown in FIG. 3 and FIG. 4 of the specification, the rotating rack 33 may be installed in a bent structure, but both ends of the rotating rack 22 are located in the same plane, and the bent portion of the rotating rack 22 is pivotally connected to the extension portion 21. As shown in FIG. 3, based on the direction shown in this drawing, the bent portion of the rotating rack 22 can be bent downward to be pivotally connected to one end of the extension portion 21 that is away from the seat frame body 1, and the rotating rack 22 other than the bent portion is formed as a retreat portion. The arrangement position of this retreat portion in the stored state is higher than the end of the bent portion, so that the retreat portion can ensure that other conventional structures in the furniture can be efficiently retreated, and the extension portion 21 is not blocked when it is stored, making it easier for the user to store it. In other embodiments of the specification, the rotating rack 22 may be installed in a straight lever shape, but the present invention is not limited to this installation, and it is sufficient that the rotating rack 22 does not collide with or interfere with surrounding structures in the stored state.

[0027] Specifically, at least one pair of pivotal connection units for pivotally connecting the extension 21 and the seat frame main body 1 is further provided at the connection point between the extension 21 and the seat frame main body 1. As shown in Figs. 3 to 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 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 21 and the seat frame main body 1. In this embodiment, the pivotal connection members are provided in two pairs. One pin is provided between the first connection member 11 and the second connection member 210 of each pair. This pin penetrates the first connection member 11 and the second connection member 210 simultaneously. As a result, both the first connecting member 11 and the second connecting member 210 are rotatable about this pin, and are excellent in rotational smoothness and are less likely to get caught.

[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 21, and the contact area is large and the connection is stable. The other side of this L-shaped member is rotatably connected to the first connecting member 11, and the structure is simple and the rotation is smooth.

[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 the third connecting members 211 is the same as the number of the rotating racks 22 installed, thereby achieving stable rotation of the extension 21 and the rotating rack 22. In addition, in one possible embodiment of the specification, the second connecting member 210 and the extension 21 may be installed in an integral structure, or the third connecting member 211 and the extension 21 may be installed in an integral structure. Furthermore, the second connecting member 210, the third connecting member 211, and the extension 21 may be installed in 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 face of the extension part 21. In this case, the groove structure is located on the end face of the extension part 21, and the first connecting member 11 is inserted into the groove structure, and the groove structure is rotatable relative to the first connecting member 11, further simplifying the structure, reducing the number of parts that need to be assembled, and reducing costs. Furthermore, the pin between the first connecting member 11 and the second connecting member 210 may be a structure of the extension part 21 body. That is, when the groove structure is cut, two pin-shaped protrusions are reserved on both sides of the groove structure in advance, and the pin-shaped protrusions are only required to be rotatably connected to the first connecting member 11, making the structure simpler and the rotation easier. In addition, since the groove structure belongs to an integral structure with the extension part 21, the parts are less likely to loosen and the rotation stability is excellent.

[0031] Specifically, the extension type seat frame further includes a driving mechanism 4. As shown in Fig. 1 and Fig. 5, the driving mechanism 4 is installed on a fixed base 3, and the output end of the driving mechanism 4 is connected to the seat frame main body 1 so as to be relatively movably, thereby causing the seat frame main body 1 to reciprocate along the extension direction, and the extension type seat frame is switched between a stored state and an extended state, so that the user does not need to manually pull the seat frame main body 1, which is convenient and saves time, and the user is highly satisfied. In addition, in one possible embodiment of the present specification, the driving mechanism 4 may be installed as a driving 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 sliding unit 6. The top of the sliding unit 6 and the seat frame main body 1 are fixedly connected. The slide rail unit 5 and the sliding unit 6 are installed so as to be slidable relative to each other. The slide rail unit 5 and the driving mechanism 4 are fixedly connected. Thereby, when the sliding 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 along 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, and play the role of guiding support. In addition, 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 each member inside the slide unit 6 slides along the extension direction, thereby avoiding the phenomenon of sliding catching or sticking. In addition, the two second guide rails 52 are located on both sides, respectively, and efficiently play the role of balance, maintaining the balance of the center of gravity of the entire slide rail unit 5, and contributing to improving the 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 be slidable back and forth along the extension direction relative to 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 being slidable relative to the second guide rail 52. In addition, in order to restrict the sliding direction from shifting, 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 are driven by the driving mechanism 4 to actively slide relative to each other as an active slide set. 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 on 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 part and a fixed part that are telescopically connected. One end of the telescopic part is connected to the seat frame main body 1, and one end of the fixed part is connected to the drive mechanism 4, so that when the drive mechanism 4 outputs power, the telescopic part can move telescopically relative to the fixed part, and moves the seat frame main body 1 relative to the fixed base 3.

[0036] Specifically, in one possible embodiment of this specification, the maximum extensible 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, which significantly increases the extension distance and meets the needs of users 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, and more seat frame main bodies 1 with different extension distances may be installed according to actual needs.

[0037] This embodiment further provides a piece of furniture including a first cushion, a second cushion, and the above-mentioned extended 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 flatness of the entire cushion, and provides excellent comfort during use.

[0038] According to this embodiment, it is clear that the present invention has the following beneficial effects. 1. In the present invention, a reversible extension is added to the rear of the seat frame body, which can greatly increase the extension distance of the seat frame body, and at the same time as the seat frame body is extended, the rear extension is reversed to fill the gap formed when the seat frame body moves to the extended state, making the movement smooth and easy, comfortable, and safe. In addition, the extension can be hidden behind the seat frame body in the stored state, so it takes up less space, improves space utilization, and makes it easier for the user to store it. 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 rotational stability. 3. The first sliding member is driven by the driving mechanism to slide and cause the second sliding member to slide, that is, the second sliding member plays the role of sliding assistance. In addition, the combination of the active slide and the passive slide limits the sliding direction of the seat frame body through multiple sliding structures, which provides high sliding stability, easy adjustment and excellent flexibility. The above description is only some embodiments of the present invention, and is not intended to limit the present invention. Those skilled in the art can make various modifications and improvements to the present invention. Any modifications, equivalent replacements, and improvements based on the present invention are all included within 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) 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), An extension-type seat frame characterized in that 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, thereby inverting the extension portion (21) when the seat frame main body (1) moves in the extension direction.

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

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

4. The hidden extension mechanism (2) further includes at least one carousel (22); The carousel (22) is pivotally connected to the extension (21), The extended seat frame according to claim 1, characterized in that the rotating rack (22) is further pivotally connected to the fixed base (3).

5. At least one pivot connection unit is provided at a connection point between the extension portion (21) and the seat frame main body (1); The pivot 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), 5. The extended seat frame according to claim 4, wherein the first connecting member (11) and the second connecting member (210) are pivotally connected in a one-to-one relationship.

6. The second connecting member (210) is an L-shaped member, The extended type seat frame according to claim 5, 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).

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

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

9. The second connecting member (210) has a groove structure, The groove structure is located on the end surface of the extension portion (21); The first connecting member (11) is inserted into the groove structure, The extended seat frame according to claim 5, wherein the groove structure is rotatable relative to the first connecting member (11).

10. Further comprising a drive mechanism (4), The drive mechanism (4) is installed on the fixed base (3), The extended-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 capable of moving relatively thereto, thereby moving the seat frame main body (1).

11. A sliding mechanism is provided 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 extended seat frame according to claim 10, characterized in that the drive mechanism (4) is drivingly connected to the slide rail unit (5) to cause the sliding unit (6) to slide relative to the slide rail unit (5).

12. 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), An output end of the drive mechanism (4) is connected to the first guide rail (51) to slide the first sliding member (61) relative to the first guide rail (51); The extended type seat frame according to claim 11, characterized in that 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 causing the second sliding member (62) to slide back and forth together with the seat frame main body (1) along the extension direction.

13. 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 portion is connected to the drive mechanism (4), The extended seat frame according to claim 10, characterized in that the drive mechanism (4) moves the telescopic part telescopically relative to the fixed part.

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

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