US20250049220A1 - Extendable seat frame and furniture thereof - Google Patents

Abstract

Provided are an extendable seat frame and a furniture thereof. The extendable seat frame includes: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state. Further, the extension apparatus includes at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
• The present application is a continuation application of PCT application No. PCT/CN2023/075714 filed on Feb. 13, 2023 which is based upon and claims priority to Chinese Patent Application No. 202220411743.8 filed on Feb. 28, 2022, and is also based upon and claims priority to Chinese Patent Application No. 202322456851.4, filed on Sep. 11, 2023, the entire disclosures of which are incorporated herein by reference for all purposes.
FIELD
• The present application generally relates to the field of smart home technology, and in particular but not limited to integrated extendable seat frames and seats.
BACKGROUND
• As the demand for smart home solutions increases, existing furniture such as sofas and chairs often feature movable seat frames to meet the varying needs of different users. Functional seats can adjust their posture, thus presenting different structural states to meet consumers' needs in various postures. Common functional seats generally have a sitting posture and a lying posture (i.e., reclining posture), where the seat acts as a bed in the lying posture. In practice, to control the size of the seat, a leg extension structure is often used to lengthen the seat. When the seat is in the sitting posture, the leg extension structure retracts backward and downward under the seat frame. When the seat is in the lying posture, the leg extension structure extends forward and upward to the front of the seat frame. However, the leg extension structure has limited effectiveness in extendable the seat length. Additionally, storing a large leg extension structure is inconvenient, and its structural stability is poor in the extended state. As a result, functional seats using conventional leg extension structures are not able to provide a reclining-like experience in the reclining position, and thus need to be improved.
• Additionally, the existing movable range of seat frames is limited. Some seats extend the length of the seat cushion by adding a footrest-like structure at the front of the seat frame, which does not meet the diverse needs of users for cushion length. Moreover, after the seat frame is extended, a significant gap appears between the back of the seat frame and the backrest frame, resulting in poor comfort and even potential safety hazards for users. Additionally, the adjustment of the seat frame position in existing technologies often relies on manual adjustment by users, which is time-consuming and inconvenient.
• Therefore, there is a need for an extendable seat frame and seat that can significantly increase the extension distance of the seat frame main body and, at the same time, drive the flip of the extension part behind the seat frame main body as it extends, to compensate for the gap formed by the movement of the seat frame main body, ensuring smooth movement, comfort, and high safety.
BRIEF SUMMARY
• The present disclosure provides examples of techniques relating to improving an extendable seat frame and a seat.
• According to a first aspect of the present disclosure, an extendable seat frame is provided, which may include: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state.
• Furthermore, the extension apparatus includes at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.
• According to a second aspect of the present disclosure, a furniture is provided, which may include: a first cushion, a second cushion, and an extendable seat frame including: a fixed base; a seat frame main body, configured to move relatively above the fixed base; and an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state.
• Furthermore, the extension apparatus includes at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.
• Moreover, the first cushion is placed above the seat frame main body, the second cushion is placed above the extension part, an upper surface of the first cushion and an upper surface of the second cushion are on a same horizontal plane.
• It is to be understood that both the foregoing general description and the following detailed description are examples only and are not restrictive of the present disclosure.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
• The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate examples consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
• FIG.1 illustrates a perspective view of the extendable seat frame in a retracted or a folded state according to one example of this present disclosure.
• FIG.2 illustrates a front view of the extendable seat frame in the retracted state or the folded state according to the example of this present disclosure.
• FIG.3 illustrates a perspective view of the extendable seat frame in an extended state according to the example of this present disclosure.
• FIG.4 illustrates a front view of the extendable seat frame in the extended state according to the example of this present disclosure.
• FIG.5 illustrates a structural schematic view of an adjustment frame and an extension apparatus in the retracted state or the folded state of the extendable seat frame according to the example of this present disclosure.
• FIG.6 illustrates a structural schematic view of the adjustment frame and the extension apparatus in the extended state of the extendable seat frame according to the example of this present disclosure.
• FIG.7 illustrates a structural schematic view of the seat in the retracted state or the folded state according to the example of this present disclosure.
• FIG.8 illustrates a structural schematic view of the seat in the extended state according to the example of this present disclosure.
• FIG.9 is a schematic structural view of an extendable seat frame in a retracted state or a folded state according to another example of the present disclosure.
• FIG.10 is a schematic structural view of the extendable seat frame in an extended state according to the example as shown inFIG.9.
• FIG.11 is a schematic view of the connection relationship between a seat frame main body and a hidden extension apparatus in the retracted state or folded state as shown inFIG.9.
• FIG.12 is a schematic view of the connection relationship between the seat frame main body and the hidden extension apparatus in the extended state as shown inFIG.9.
• FIG.13 is a schematic structural view of a sliding apparatus in a retracted state or a folded state in another example of this present disclosure.
DETAILED DESCRIPTION
• Reference will now be made in detail to specific implementations, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous non-limiting specific details are set forth in order to assist in understanding the subject matter presented herein. But various alternatives may be used without departing from the scope of claims and the subject matter may be practiced without these specific details.
• Reference throughout this specification to “one embodiment,” “an embodiment,” “an example,” “some embodiments,” “some examples,” or similar language means that a particular feature, structure, or characteristic described is included in at least one embodiment or example. Features, structures, elements, or characteristics described in connection with one or some embodiments are also applicable to other embodiments, unless expressly specified otherwise.
• In the present disclosure, it should be understood that terms such as “up,” “down,” “left,” “right,” “top,” “bottom,” “front,” “rear,” etc., indicating directions or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. These terms are used for ease of description and simplification, and do not imply that the indicated devices or components must have specific orientations or be constructed and operated in specific orientations. Therefore, they should not be construed as limitations to the present disclosure.
• It should be illustrated that the terms “first,” “second,” and the like used in the description, claims of the present disclosure, and the accompanying drawings are used to distinguish objects, and not used to describe any specific order or sequence.
• Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of this present application is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.
• Referring toFIG.1 toFIG.8, an integrated extendable seat frame is applied to a seat. Specifically, the integrated extendable seat frame constitutes the main framework of the seat, and the posture adjustment of the integrated extendable seat frame corresponds to the posture adjustment of the seat. For convenience of description, the integrated extendable seat frame will be collectively referred to as the extendable seat frame in the following text.
• The extendable seat frame may include abase1, anadjustment frame3, adriver2, and anextension apparatus4. Thebase1 may include a front end and a rear end in the extendable direction of the extendable seat frame. Theadjustment frame3 is movably mounted on thebase1. Thedriver2 drives theadjustment frame3 to reciprocate between the front end and the rear end, so that the extendable seat frame can switch between an extended state and a retracted state (i.e., a folded state).
• Theextension apparatus4 is adjustably configured between thebase1 and theadjustment frame3. Theextension apparatus4 includes alimiting link41, abackrest fixing rod42, and anextension plate set43 that are pivotally connected in sequence. Thelimiting link41 is pivotally connected to thebase1, and theextension plate set43 is pivotally connected to theadjustment frame3.
• When the extendable seat frame switches from the retracted state to the extended state, theadjustment frame3 moves toward the front end, and the extension plate set43 pulls thebackrest fixing rod42 and the limitinglink41 to flip toward the front end.
• FIG.7 andFIG.8 are schematic diagrams of the structure of the extendable seat frame with cushions assembled. Specifically, thebase1 provides longitudinal support force for the extendable seat frame or the seat including the extendable seat frame. Theadjustment frame3 is fitted with a seat cushion I, and thebackrest fixing rod42 is fitted with an extension cushion II. When the seat, that is, the extendable seat frame, is in the retracted state, thebackrest fixing rod42, extension cushion II, and part of the seat cushion I are stored behind the backrest cushion III. When the seat, that is, the extendable seat frame, is in the extended state, theadjustment frame3 drives the seat cushion I forward, and thebackrest fixing rod42 drives the extension cushion II to flip forward, thereby extendable the length of the seat.
• It should be noted that the increased seat depth or length of the seat in the extended state, compared to the seat in the retracted state, is the sum of the length of the extension cushion II and the length of the part of the seat cushion I that is behind the backrest cushion III. This significantly increases the length of the seat, thereby enabling the seat to function as a bed in the extended state.
• In another example, in order to improve structural stability, theadjustment frame3 has asupport rod33. Thesupport rod33 extends in the front-rear direction, that is, in the extendable direction of the extendable seat frame. The front end of thesupport rod33 is equipped with aroller331 that is in rolling contact with the ground, and the seat cushion I is positioned on thesupport rod33.
• In another example, the extension plate set43 includes at least one pullingextension plate431, with one end of the pullingextension plate431 pivotally connected to thebackrest fixing rod42 and the other end pivotally connected to theadjustment frame3. Theadjustment frame3 is capable of more stably driving thebackrest fixing rod42 through the pullingextension plate431, while also being able to reduce the height of theadjustment frame3 through the pullingextension plate431.
• In another example, when theadjustment frame3 is directly pivotally connected to thebackrest fixing rod42, the height of theadjustment frame3 would need to be increased to achieve the same leverage effect provided by the pullingextension plate431. However, increasing the height of theadjustment frame3 could interfere with the extension cushion II. To achieve the desired length of the seat in the extended state, as shown inFIG.7, increasing the height of thebackrest fixing rod42 is the optimal choice. This makes it possible to increase the height of thebackrest fixing rod42, allowing for the installation of a longer extension cushion II without compromising the structural stability of the seat. This is beneficial for achieving a greater seat depth when the extendable seat frame, or seat, is in the extended state, thereby transforming the seat into a bed. At the same time, when the extendable seat frame is in the extended state, the pullingextension plate431 can cooperate with thebackrest fixing rod42 to provide longitudinal support for the extension cushion II, thereby effectively ensuring the structural stability of the seat.
• In another example, the pullingextension plate431 is a single unit. Specifically, as shown inFIG.3 andFIG.4, the pivot point between thebackrest fixing rod42 and the limitingrod41 is defined as a first pivot point a, the pivot point between thebackrest fixing rod42 and the extension plate set43 is defined as a second pivot point b, and the pivot point between the extension plate set43 and theadjustment frame3 is defined as a third pivot point c. When the extendable seat frame is in the extended state, the angle α between the line connecting the first pivot point a and the second pivot point b, and the line connecting the second pivot point b and the third pivot point c is α=150°-180°. In some examples, α=170°-180°. In this way, the pullingextension plate431 can better cooperate with thebackrest fixing rod42 to provide support for the extension cushion II.
• In other examples, there can be two or three pullingextension plates431, with the two or three pullingextension plates431 being pivotally connected in sequence.
• As shown inFIG.1 andFIG.2, theadjustment frame3 includes a frontseat frame support31 and a front fixingmount32 that are connected to each other. Thesupport rod33 is fixedly connected to the frontseat frame support31. The front fixingmount32 is pivotally connected to the extension plate set43. Furthermore, thefront fixing mount32 is L-shaped, with one end fixedly connected to the frontseat frame support31 and the other end pivotally connected to the extension plate set43, with the pivot point between them being the third pivot point c. As shown inFIG.7, the L-shapedfront fixing mount32 can avoid excessive interference with the seat cushion I, allowing the seat cushion I to fit more closely to thefront fixing mount32 in the rearward direction. This, in turn, helps to reduce the gap between the seat cushion I and the extension cushion II when in the extended state, effectively improving the comfort of the seat. In some examples, the height of the frontseat frame support31 is less than 40 cm. In one or more examples, the height of the frontseat frame support31 is between 20 cm and 40 cm with two ends included.
• In another example, the pullingextension plate431 is provided with a first limitingshaft4311, which is located between the second pivot point b and the third pivot point c. When the extendable seat frame is in the retracted state, the first limitingshaft4311 rests against thebackrest fixing rod42. The first limitingshaft4311 works with thebackrest fixing rod42 to limit the movement of the pullingextension plate431, thereby assisting thedriver2 in limiting the movement of theadjustment frame3, ensuring that the extendable seat frame remains stable in the retracted state.
• As shown inFIG.3 andFIG.4, a second limitingshaft321 is provided on thefront fixing mount32. When the extendable seat frame is in the extended state, the pullingextension plate431 rests against the second limitingshaft321. In some examples, the pullingextension plate431 is provided with a limitinggroove4312 corresponding to the second limitingshaft321, which is used to accommodate the second limitingshaft321. The second limitingshaft321 is used to limit and support the pullingextension plate431, thereby improving the structural strength of theextension apparatus4 when the extendable seat frame is in the extended state, and preventing the extension cushion II from collapsing.
• In another example, theadjustment frame3 is slidably connected to thebase1. As shown inFIG.1, the fixedbase1 includes afront beam12, amiddle beam13, and aguide rail16. Theguide rail16 spans thefront beam12 and themiddle beam13 and is fixedly connected to both thefront beam12 and themiddle beam13. The extendable direction of theguide rail16 is parallel to the extendable direction of the extendable seat frame, that is, the front-rear direction. Theadjustment frame3 is slidably connected to theguide rail16. Specifically, theguide rail16 is provided with aslide groove161, and the bottom of the frontseat frame support31 is fitted with a second slidingmember311 that is compatible with theslide groove161. In some examples, theslide groove161 is a T-shaped slot.
• In some examples, thedriver2 is a linear actuator, with the fixedpart21 of thedriver2 mounted on themiddle beam13, and the first slidingmember22 connected to theseat frame body3. To improve the structural strength and stability of the extendable seat frame, the extendable seat frame includes two parallel guide rails16. Themiddle beam13 and thefront beam12 are parallel to each other, and thedriver2 is positioned between the twoguide rails16. Accordingly, twoadjustment frames3 are correspondingly set with the twoguide rails16, and the twoadjustment frames3 are linked by alinkage beam5. During use, the fixedpart21 of thedriver2 is mounted on themiddle beam13, and the first slidingmember22 is connected to thelinkage beam5, to synchronously drive the twoadjustment frames3 to reciprocate along the front-rear direction relative to the guide rails16. In some examples, the moving distance driven by thedriver2 is greater than 300 mm.
• Thebase1 may further include arear beam14, with therear beam14 positioned at the rear end, thefront beam12 positioned at the front end, and themiddle beam13 positioned between thefront beam12 and therear beam14. The rotatingframe41 is pivotally connected to themiddle beam13 or theguide rail16. When the extendable seat frame is in the retracted state, the rotatingframe41 extends toward therear beam14, and thebackrest fixing rod42 and the extension plate set43 are located in the area between themiddle beam13 and therear beam14. As shown inFIG.7 andFIG.8, the area between themiddle beam13 and therear beam14 is within the backrest region of the seat, used to store the extension cushion II and part of the seat cushion I in the retracted state, to restore the seat's conventional seating depth when the seat is in the normal sitting posture.
• In another example, thebase1 further includes alongitudinal beam11, with thefront beam12,middle beam13, andrear beam14 all fixedly connected to thelongitudinal beam11.
• In another example, there are twolongitudinal beams11, positioned at the ends of the extendable direction of thefront beam12,middle beam13, andrear beam14, forming a structurally stable box-type base1.
• In another example, thelongitudinal beams11 are provided with armrest beams111. The armrest beams111, together with thelongitudinal beams11,front beam12,middle beam13, andrear beam14, achieve an integrated structural design for the extendable seat frame, providing good structural stability and case of assembly. During operation, the armrest beams111 and thelongitudinal beams11 are used to install the side panels of the seat (not shown in the figures), to conceal the internal structure of the seat frame from the sides.
• In another example, themiddle beam13 is provided with a fixingplate131, and therotating frame41 is pivotally connected to the fixingplate131. Furthermore, the rotatingframe41 is provided with a third limitingshaft411. When the extendable seat frame is in the retracted state, the third limitingshaft411 rests against the fixingplate131. The third limitingshaft411 limits therotating frame41, and together with the first limitingshaft4311, limits the pullingextension plate431, assisting thedrive mechanism2 in stabilizing the position of theseat frame body3, to ensure that the extendable seat frame is in a stable retracted state. The rotatingframe41, in cooperation with the front fixingmount32, provides support for thebackrest fixing rod42 and the pullingextension plate431 when in the extended state.
• In another example, thebase1 may further include abackrest beam15 positioned near therear beam14, and the backrest cushion III is mounted on thebackrest beam15.
• As shown inFIG.7 andFIG.8, provided is also a seat, including the aforementioned seat cushion I, extension cushion II, backrest cushion III, and extendable seat frame. The seat cushion I is mounted on theadjustment frame3, the extension cushion II is mounted on thebackrest fixing rod42, and the backrest cushion III is positioned above the seat cushion I and the extension cushion II. The space behind and below the backrest cushion III is defined as the storage area A. When the extendable seat frame is in the retracted state, the extension cushion II and at least part of the seat cushion I are positioned in the storage area A. When the extendable seat frame is in the extended state, the extension cushion II and the seat cushion I exit the storage area A, and the working surface of the extension cushion II is flush with the working surface of the seat cushion I.
• As shown inFIG.8, the working surface of the extension cushion II is its upper surface, and the working surface of the seat cushion I is its upper surface. This seat can switch between an extended state and a retracted state. In the retracted state, the seat functions as a regular seat, whereas in the extended state, the extension cushion II and the seat cushion I together significantly increase the seat depth, with the working surface of the extension cushion II being at the same level as the working surface of the seat cushion I, thereby enabling the seat to function as a true bed.
• The extendable seat frame provided by examples in the present disclosure, for example as shown inFIGS.1-8, has a stable structure and convenient posture adjustment, which can offer a greater seat depth when the seat equipped with this integrated extendable seat frame in the extended state. Further, the seat with the extendable seat frame, when in the extended state, offers a large seat depth and can be converted into a bed.
• The technical solution of the examples above at least has the following advantages and beneficial effects:
• The seat frame body of the present disclosure can more stably drive the lengthening part through the extension plate set while also being able to reduce the height of the seat frame body through the extension plate set. This makes it possible to increase the height of the lengthening part, which is beneficial for the extendable seat frame, that is, the seat, to achieve a greater seat depth when in the extended state, thereby enabling the transformation of the seat into a bed function. At the same time, when the extendable seat frame is in the extended state, the pulling extension plate can cooperate with the lengthening part to provide longitudinal support force for the extension cushion, thereby effectively ensuring the structural stability of the seat.
• The examples of this present disclosure are implemented through the following technical solutions.
• In some examples, provided is an extendable seat frame, including: a base, having a front end and a rear end in the extendable direction of the extendable seat frame; an adjustment frame, movably mounted on the fixed base; a driver, configured to drive the seat frame body to reciprocate between the front end and the rear end, so that the extendable seat frame can switch between an extended state and a retracted state; an extension apparatus, adjustably configured between the fixed base and the adjustment frame, the extension apparatus includes a rotating frame, a backrest fixing rod, and an extension plate set that are pivotally connected in sequence, wherein the rotating frame is pivotally connected to the base, and the extension plate set is pivotally connected to the adjustment frame.
• When the extendable seat frame switches from the retracted state to the extended state, the adjustment frame moves toward the front end, and the extension plate set pulls the backrest fixing rod and the rotating frame to flip toward the front end.
• In some examples, the pivot point between the backrest fixing rod and the rotating frame is defined as the first pivot point, the pivot point between the backrest fixing rod and the extension plate set is defined as the second pivot point, and the pivot point between the extension plate set and the adjustment frame is defined as the third pivot point. When the extendable seat frame is in the extended state, the angle between the line connecting the first pivot point and the second pivot point and the line connecting the second pivot point and the third pivot point is 150°-180°.
• In some examples, the extension plate set includes at least one pulling extension plate, with one end of the pulling extension plate pivotally connected to the backrest fixing rod, and the other end pivotally connected to the adjustment frame.
• In some examples, the adjustment frame is slidably connected to the base.
• In some examples, the base includes a front beam, a middle beam, and a guide rail, where the guide rail extends across the front beam and the middle beam and is fixedly connected to both the front beam and the middle beam, with the extendable direction of the guide rail being parallel to the extendable direction of the extendable seat frame; the seat frame body is slidably connected to the guide rail.
• In some examples, the base further includes a rear beam, with the rear beam positioned at the rear end, the front beam positioned at the front end, and the middle beam positioned between the front beam and the rear beam. The rotating frame is pivotally connected to the middle beam or the guide rail. When the extendable seat frame is in the retracted state, the rotating frame extends toward the rear beam, and the backrest fixing rod and the extension plate set are located in the area between the middle beam and the rear beam.
• In some examples, the fixed base further comprises longitudinal beams, with the front beam, middle beam, and rear beam all fixedly connected to the longitudinal beams.
• In some examples, the middle beam is provided with a fixing plate, and the rotating frame is pivotally connected to the fixing plate.
• In some examples, the longitudinal beams are provided with armrest beams.
• In some examples, the adjustment frame has a support rod that is extendable in the extendable direction of the extendable seat frame, with the front end of the support rod fitted with a roller that is in rolling contact with the ground.
• In some examples, the adjustment frame includes a front seat frame support and a front fixing mount that are connected to each other, with the support rod fixedly connected to the front seat frame support; the front fixing mount is pivotally connected to the extension plate set.
• In some examples, the front fixing mount is L-shaped, with one segment fixedly connected to the front seat frame support and the other segment pivotally connected to the extension plate set.
• In some examples, the extension plate set includes a pulling extension plate, and the pulling extension plate is provided with a first limiting shaft; when the extendable seat frame is in the retracted state, the first limiting shaft rests against the backrest fixing rod.
• In some examples, the extension plate set includes a pulling extension plate, and the front fixing mount is provided with a second limiting shaft; when the extendable seat frame is in the extended state, the pulling extension plate rests against the second limiting shaft.
• FIGS.9-13 illustrate some other examples of an extendable seat frame. As shown inFIG.9, the extendable seat frame includes a seat framemain body901, ahidden extension apparatus902, and a fixedbase903. Here, the seat framemain body901 is set to move relatively above the fixedbase903, and thehidden extension apparatus902 is rotatably connected to the seat framemain body901. Thehidden extension apparatus902 is also rotatably connected to the fixedbase903, enabling the extendable seat frame to switch between a retracted state and an extended state.FIGS.9-10 show the transformation process of the extendable seat frame from a retracted state to a fully extended state. In this example, thehidden extension apparatus902 is a flip-type structure, hidden between the seat frame main body and the backrest frame in the retracted state, occupying less space and facilitating user storage. In the extended state, thehidden extension apparatus902 can flip to an almost horizontal state, cooperating with the seat framemain body901, thereby extendable the overall length of the seat frame structure, avoiding gaps behind the seat frame main body, ensuring user comfort and high safety in use.
• Specifically, as shown inFIGS.9-10, thehidden extension apparatus902 includes anextension part921 and tworotating frames922. As shown inFIG.9, theextension part921 is stored behind the seat framemain body901 in the retracted state. Depending on the actual space limitations, theextension part921 may be placed vertically or at a certain angle to the vertical direction. As shown inFIGS.9-10, the seat framemain body901 can move in the extendable direction, and theextension part921 is rotatably connected to the end of the seat framemain body901 that is away from the extendable direction, allowing theextension part921 to rotate as the seat framemain body901 rotates. Finally, as shown inFIG.10, when the seat framemain body901 moves to the final extended state, theextension part921 also flips to a fully extended state, i.e., the extended seat frame switches to the extended state. Moreover, in another example, theextension part921 is placed parallel to the seat framemain body901 in the extended state to ensure the overall balance of the seat frame structure. In another example, theextension part921 may also be set at an inclined angle of 1˜3° to the plane where the seat framemain body901 is located, and the end of theextension part921 away from the seat framemain body901 is higher than the end connected to the seat framemain body901, further enhancing support stability and comfort.
• Specifically, the extendable seat frame may be applied to a furniture such as a sofa, a chair, or a seat. In another example, the overall depth of the sofa, that is, the depth of the armrest, may be set to 900˜1000 mm. Due to the limited depth of the sofa, the length of theextension part921 in the extendable direction may be set to 200˜350 mm. On one hand, this ensures that the extension part has sufficient length to compensate for the gap formed after the seat framemain body901 extends, preventing the user from falling into the gap and reducing discomfort due to lack of support at the user's lower back. On the other hand, it avoids the overlylong extension part921 from being bumped by internal structures or the ground during storage, thereby extendable the lifespan of the extendable seat frame. In another example, the depth of the armrest may be set to 950 mm, and the length of theextension part921 may be set to 280 mm, providing high comfort and user satisfaction.
• Specifically, eachrotating frame922 is rotatably connected to theextension part921 and is also rotatably connected to the fixedbase903, allowing theextension part921 to freely flip as the seat framemain body901 moves, without being easily restricted by rotation. Moreover, tworotating frames922 are respectively set on both sides of theextension part921 to ensure balance and stability during rotation. In another example, based on the support strength and structural stability, only onerotating frame922 may be set, saving material costs.
• Furthermore, as shown inFIGS.11 and12, therotating frame922 may be set as a bent structure, but both ends of therotating frame922 remain in the same plane. The bent section of therotating frame922 is rotatably connected to theextension part921. As shown inFIG.11, based on the direction shown in the figure, the bent section of therotating frame922 bends downwards, allowing the bent section to be rotatably connected to the end of theextension part921 that is far from the seat framemain body901. At the same time, the part of therotating frame922 outside the bent section forms an avoidance section. The placement position of this avoidance section in the retracted state should be higher than the end of the bent section to ensure that the avoidance section can effectively avoid other existing structures in the furniture (e.g., sofa), preventing theextension part921 from being blocked during storage, facilitating user storage. In another example, therotating frame922 may also be a straight rod, and the present disclosure does not limit this; as long as therotating frame922 does not collide with or obstruct surrounding structures in the retracted state.
• Specifically, at least one set of rotating connection components is also set at the connection between theextension part921 and the seat framemain body901 to rotatably connect theextension part921 to the seat framemain body901. As shown inFIGS.11-12, the rotating connection component includes afirst connector911 and asecond connector9210. Thefirst connector911 is fixed to the end face of the seat framemain body901, while thesecond connector9210 is fixed to theextension part921. Thefirst connector911 and thesecond connector9210 are rotatably connected to each other, thus achieving the rotational connection between theextension part921 and the seat framemain body901. In this example, two sets of rotating connectors are set, and a pin is set between thefirst connector911 and thesecond connector9210 in each set. The pin simultaneously penetrates thefirst connector911 and thesecond connector9210, allowing both thefirst connector911 and thesecond connector9210 to rotate around the pin, providing good rotational flexibility and preventing jamming.
• Specifically, in another example, thesecond connector9210 is set as a bent L-shaped piece. One side of the L-shaped piece is fixedly connected to theextension part921, with a large contact area and reliable connection, while the other side of the L-shaped piece is rotatably connected to thefirst connector911, with a simple structure and flexible rotation.
• Specifically, as shown inFIG.12, athird connector9211 is also fixedly set on theextension part921. Thethird connector9211 is used for rotatable connection with therotating frame922. The number of third connectors211 is the same as the number ofrotating frames922 set, thus achieving stable rotation between theextension part921 and therotating frame922. In another example, thesecond connector9210 and theextension part921 may be set as an integrated structure, or thethird connector9211 and theextension part921 may be set as an integrated structure. Alternatively, thesecond connector9210, thethird connector9211, and theextension part921 may all be set as an integrated structure, reducing the number of assembly parts and improving assembly and production efficiency.
• Specifically, in another example, thesecond connector9210 may be directly set as a groove structure, that is, thesecond connector9210 is directly formed by grooving the end face of theextension part921. The groove structure is located on the end face of theextension part921, and thefirst connector1 is inserted into the groove structure. The groove structure may rotate relative to thefirst connector911, further simplifying the structure, reducing the number of parts needed for assembly, and lowering costs. Moreover, the pin between thefirst connector911 and thesecond connector9210 may also be a structure of theextension part921 itself. That is, when grooving the groove structure, two pin-shaped protrusions are reserved on both sides of the groove structure, allowing the pin-shaped protrusions to be rotatably connected to thefirst connector911. The structure is simpler, and rotation is more convenient. The groove structure, being an integral part of theextension part921, is also less likely to have loose parts, ensuring good rotational stability.
• Specifically, the extendable seat frame may also include adriver904, as shown inFIGS.9 and13. Thedriver904 is set on the fixedbase903, and the output end of thedriver904 is also relatively movably connected to the seat framemain body901, thereby driving the seat framemain body901 to reciprocate in the extendable direction, achieving the switch between the retracted state and the extended state of the extendable seat frame without the need for the user to manually drag the seat framemain body901, saving effort and providing high user satisfaction. In one example, thedriver904 may be a drive motor, occupying a small space, with sufficient power and a long service life. In some examples, thedriver904 may be thesame driver2 as shown inFIG.1.
• Specifically, as shown inFIG.13, a sliding apparatus is set between the seat framemain body901 and the fixedbase903. The sliding apparatus includes aslide rail component905 and a slidingcomponent906. The top of the slidingcomponent906 is fixedly connected to the seat framemain body901, and theslide rail component905 is relatively slidably set with the slidingcomponent906. Theslide rail component905 is fixedly connected to thedriver904, so that when the slidingcomponent906 slides relative to theslide rail component905, it drives the seat framemain body901 to slide in the extendable direction relative to the fixedbase903.
• Specifically, as shown inFIG.13, theslide rail component905 includes afirst guide rail951 and two second guide rails952. Thesecond guide rails952 are located on both sides of thefirst guide rail951 and are set parallel to thefirst guide rail951, playing an auxiliary guiding role. In some examples, the extendable direction of thefirst guide rail951 and thesecond guide rail952 is consistent with the extendable direction, limiting the sliding direction of the seat framemain body901, ensuring that all components inside the slidingcomponent906 slide in the extendable direction, avoiding sliding jams or even getting stuck. At the same time, the twosecond guide rails952 are respectively located on both sides, effectively playing a balancing role, maintaining the overall center of gravity balance of theslide rail component905, which is conducive to improving overall stability.
• In some examples, the slidingcomponent906 includes a first slidingpart961 and two second slidingpart962. The first slidingpart961 is driven by thedriver904, allowing it to slide back and forth along thefirst guide rail951 in the extendable direction. The second slidingpart962 are fixedly connected to the first slidingpart961. Thus, when the first slidingpart961 is driven to move, the second slidingpart962 slide along with it, enabling the second slidingpart962 to slide relative to thesecond guide rail952. At the same time, to further limit any deviation in the sliding direction, each second slidingpart962 is slidably connected to a correspondingsecond guide rail952, ensuring that the sliding direction of the second slidingpart962 follows the extendable direction of thesecond guide rail952, that is, moving back and forth in the extendable direction. In this sliding mechanism, thefirst guide rail951 and the first slidingpart961 act as the primary sliding group, driven by thedriver904 to perform active relative sliding motion, while thesecond guide rail952 and the second slidingpart962 act as the auxiliary sliding group, being passively moved in relative sliding motion. Additionally, the top of the second slidingpart962 is equipped with a support part, used to fix the second slidingpart962 to the seat framemain body901, thus allowing the first slidingpart961 and the second slidingpart962 to cooperate with each other, further driving the seat framemain body901 to perform reciprocating sliding, ensuring balance and stability.
• In one example, an extendable push rod is set between the seat framemain body901 and the fixedbase903. This extendable push rod includes a telescopic section and a fixed section that are telescopically connected. One end of the telescopic section is connected to the seat framemain body901, while one end of the fixed section is connected to thedriver904. Thus, when thedriver904 outputs power, the telescopic section can move telescopically relative to the fixed section, further driving the seat framemain body901 to move relative to the fixedbase903.
• In another example, the maximum moving distance that the seat framemain body901 may extend is 450˜600 mm. That is, the position of the seat framemain body901 in the extended state is moved forward by 450˜600 mm compared to its position in the retracted state, greatly increasing the extendable distance and meeting the user's needs for different seat frame lengths. In another example, the maximum moving distance may be 500 mm. However, this present disclosure is not limited to this moving distance. Depending on actual needs, the seat framemain body901 may have various different extendable distances.
• The present disclosure also provides a piece of furniture, including a first cushion, a second cushion, and the above-described extendable seat frame. The first cushion is set above the seat framemain body901, while the second cushion is set above theextension part921. In the retracted state, the second cushion is placed behind the seat framemain body901 along with theextension part921. In the extended state, the upper surface of the first cushion and the upper surface of the second cushion are on the same horizontal plane, ensuring the overall flatness of the cushions and high comfort in use.
• According to the examples above, the present disclosure adds a flip-type extension part behind the seat frame main body, which can greatly increase the extendable distance of the seat frame main body. At the same time, as the seat frame main body extends, it drives the extension part behind to flip, compensating for the gap formed when the seat frame main body moves to the extended state. The movement is smooth and convenient, with good comfort and high safety. Additionally, the extension part may be hidden behind the seat frame main body in the retracted state, occupying less space, improving space utilization, and facilitating user storage.
• Additionally, the present disclosure sets a rotating frame between the extension part and the fixed base for rotational connection, allowing the extension part to flexibly rotate as the seat frame main body extends, making extension convenient and rotation stability good.
• Furthermore, the first sliding part is driven by the driver to slide, which in turn drives the second sliding part to slide. That is, the second sliding part plays an auxiliary sliding role, and the combination of active and passive sliding ensures that the sliding direction of the seat frame main body is restricted by multiple sliding structures, providing high sliding stability, easy adjustment, and good flexibility.
• Other implementation solutions of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following the general principles thereof and including such departures from the disclosure as come within known or customary practice in the art. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
• It will be appreciated that the disclosure is not limited to the exact construction that has been described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. It is intended that the scope of the disclosure only be limited by the appended claims.

Claims (20)

What is claimed is:

1. An extendable seat frame, comprising:

a fixed base;

a seat frame main body, configured to move relatively above the fixed base; and

an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state,

wherein the extension apparatus comprises at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction.

2. The extendable seat frame according toclaim 1, wherein a length of the extension part is within 200˜350 mm.

3. The extendable seat frame according toclaim 1, wherein a maximum moving distance of the seat frame main body is within 450˜600 mm.

4. The extendable seat frame according toclaim 1, wherein the extension apparatus further comprises at least one rotating frame that is rotatably connected to the extension part and rotatably connected to the fixed base.

5. The extendable seat frame according toclaim 4, wherein at least one rotating connection component is placed at a connection point of the extension part with the seat frame main body, the at least one rotating connection component comprises a first connector and a second connector, the first connector is fixed to an end face of the seat frame main body, and the second connector is fixed to the extension part, and the first connector and the second connector are rotatably connected correspondingly.

6. The extendable seat frame according toclaim 5, wherein the second connector is an L-shaped piece, with one side fixed to the extension part and the other side rotatably connected to the first connector.

7. The extendable seat frame according toclaim 5, wherein at least one third connector is fixed on the extension part, with the third connector rotatably connected correspondingly to a rotating frame.

8. The extendable seat frame according toclaim 7, wherein both the second connector and the third connector are integrally structured with the extension part.

9. The extendable seat frame according toclaim 5, wherein the second connector has a groove structure located at an end face of the extension part, the first connector is inserted into the groove structure, and the groove structure is configured to rotate relative to the first connector.

10. The extendable seat frame according toclaim 1, wherein the extendable seat frame further comprises a driver that is placed on the fixed base, an output end of the driver is movably connected to the seat frame main body, and the driver is configured to drive movement of the seat frame main body.

11. The extendable seat frame according toclaim 10, wherein a sliding apparatus is placed between the seat frame main body and the fixed base, the sliding apparatus comprises a slide rail component and a sliding component configured to slide relatively, a top of the sliding component is fixedly connected to the seat frame main body, the driver is drivingly connected to the slide rail component, and the driver is configured to drive the sliding component to slide relative to the slide rail component.

12. The extendable seat frame according toclaim 11, wherein the slide rail component comprises a first guide rail and at least one second guide rail, and the sliding component comprises a first slider and at least one second slider, the output end of the driver is connected to the first guide rail and configured to drive the first slider to slide relative to the first guide rail, the first slider is fixedly connected to the second slider, and a top of the second slider is fixedly connected to the seat frame main body and drives the second slider and the seat frame main body to slide reciprocally along the extending direction.

13. The extendable seat frame according toclaim 10, wherein an extendable push rod is placed between the seat frame main body and the fixed base, the extendable push rod comprises an extendable section and a fixed section connected telescopically, one end of the extendable section is connected to the seat frame main body, and one end of the fixed section is connected to the driver, and the driver is configured to drive the extendable section to move telescopically relative to the fixed section.

14. A furniture, comprising:

a first cushion,

a second cushion, and

an extendable seat frame comprising:

a fixed base;

a seat frame main body, configured to move relatively above the fixed base; and

an extension apparatus, configured to be rotatably connected to the fixed base and rotatably connected to the seat frame main body so as to enable the extendable seat frame to switch between a retracted state and an extended state,

wherein the extension apparatus comprises at least an extension part, one end of the extension part is rotatably connected to an end of the seat frame main body that is away from an extending direction, and the extension part is configured to drive the extension part to flip in response to the seat frame main body moving towards the extending direction,

wherein the first cushion is placed above the seat frame main body, the second cushion is placed above the extension part, an upper surface of the first cushion and an upper surface of the second cushion are on a same horizontal plane.

15. The furniture according toclaim 14, wherein a length of the extension part is within 200˜350 mm.

16. The furniture according toclaim 14, wherein a maximum moving distance of the seat frame main body is within 450˜600 mm.

17. The furniture according toclaim 14, wherein the extension apparatus further comprises at least one rotating frame that is rotatably connected to the extension part and rotatably connected to the fixed base.

18. The furniture according toclaim 17, wherein at least one rotating connection component is placed at a connection point of the extension part with the seat frame main body, the at least one rotating connection component comprises a first connector and a second connector, the first connector is fixed to an end face of the seat frame main body, and the second connector is fixed to the extension part, and the first connector and the second connector are rotatably connected correspondingly.

19. The furniture according toclaim 18, wherein the second connector is an L-shaped piece, with one side fixed to the extension part and the other side rotatably connected to the first connector.

20. The furniture according toclaim 18, wherein at least one third connector is fixed on the extension part, with the third connector rotatably connected correspondingly to a rotating frame.

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