CN216907368U - Seat stretching device and seat - Google Patents

Abstract

The utility model discloses a seat stretching device and a seat, and belongs to the technical field of furniture. The seat stretching device comprises a stretching assembly and a driving assembly, wherein the stretching assembly comprises a seat frame unit, a backrest unit and a leg placing unit, the backrest unit and the leg placing unit are respectively positioned at two ends of the seat frame unit along the front-back direction, and at least one of the backrest unit and the leg placing unit is pivoted with the seat frame unit; the driving components are arranged in one-to-one correspondence with the backrest units and/or the leg rest units which are pivoted with the seat frame units; the driving assembly comprises a driving piece and a driving connecting piece, one end of the driving piece is pivoted with the seat frame unit, the other end of the driving piece is pivoted with one end of the driving connecting piece, and the other end of the driving connecting piece is fixedly connected with the backrest unit or the leg rest unit so as to drive the backrest unit or the leg rest unit to extend or retract. The backrest unit and/or the leg placing unit can be independently controlled, the structure is simple, the number of connecting rods is small, and the assembly, the disassembly and the transportation are convenient.

Description

Seat stretching device and seat

Technical Field

The utility model relates to the technical field of furniture, in particular to a seat stretching device and a seat.

Background

Along with the requirement of people on the comfort level of furniture, many furniture such as seats, sofas and the like are provided with stretching devices and are provided with driving mechanisms to drive the stretching devices to stretch or furl, so that the change from sitting postures and TV postures to lying postures can be realized, various requirements of sitting, leisure, sleeping and the like are met, the furniture such as the sofas and the like have different postures, and different requirements are met.

However, the stretching devices and driving mechanisms of furniture such as sofas and the like on the market are complex in structure, so that the number of connecting rods is large, the assembly is complex, the furniture is inconvenient to disassemble and transport, the cost is high, and the requirements of low-income people cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a seat stretching device and a seat, which can meet the requirements of various posture adjustment and have simple structure and low cost.

In order to realize the purpose, the following technical scheme is provided:

in one aspect, there is provided a seat extension apparatus including:

the extension assembly comprises a seat frame unit, a backrest unit and a leg rest unit, wherein the backrest unit and the leg rest unit are respectively positioned at two ends of the seat frame unit along the front-back direction, and at least one of the backrest unit and the leg rest unit is pivoted with the seat frame unit;

the driving assemblies are arranged in one-to-one correspondence with the backrest units and/or the leg rest units which are pivoted with the seat frame units; the driving assembly comprises a driving piece and a driving connecting piece, one end of the driving piece is pivoted with the seat frame unit, the other end of the driving piece is pivoted with one end of the driving connecting piece, and the other end of the driving connecting piece is fixedly connected with the backrest unit or the leg rest unit so as to drive the backrest unit or the leg rest unit to extend or retract.

As an alternative to a seat extension arrangement, in the drive assembly corresponding to the back unit, the drive connection is arcuate and the arcuate is bowed away from the seat frame unit.

As an alternative of the seat stretching device, the backrest unit includes a backrest support frame and two backrest adapters respectively disposed at two ends of the backrest support frame in the width direction and symmetrically disposed, and the width direction is perpendicular to the front-back direction;

the backrest adapter comprises a first adapter end, a second adapter end and a third adapter end which are arranged in a triangular shape, the first adapter end is fixedly connected with the backrest support frame, the second adapter end is pivoted with the seat frame unit, and the third adapter end is fixedly connected with the driving connecting piece.

As an alternative to the seat extension device, in the driving assembly corresponding to the backrest unit, there are two driving connecting pieces, and one end of each of the two driving connecting pieces is fixedly connected to the third switching ends of the two backrest switching pieces in a one-to-one correspondence manner;

the backrest unit further comprises a switching installation part, wherein the switching installation part is connected with the two ends of the width direction respectively and fixedly connected with the other ends of the two driving connecting pieces, and the switching installation part is pivoted with the driving piece.

As an alternative of the seat stretching device, the seat frame unit includes a seat frame support frame and seat frame connecting pieces that are arranged in one-to-one correspondence with the two backrest transition pieces, one end of each seat frame connecting piece is fixedly connected with the seat frame support frame, and the other end of each seat frame connecting piece is pivoted with the corresponding second transition end.

As an alternative to the seat stretching device, in the driving assembly corresponding to the leg rest unit, one end of the driving connecting member is fixedly connected to the bottom of the leg rest unit near one end of the seat frame unit, and the other end of the driving connecting member is inclined in a direction away from the seat frame unit and is pivoted with the driving member.

As an alternative to the seat stretching device, when one of the backrest unit and the leg rest unit is pivotally connected to the seat frame unit, the driving assembly further includes a driving installation member, one end of the driving installation member is fixedly connected to the seat frame unit, and the other end of the driving installation member is pivotally connected to the driving member.

As an alternative to the seat extension arrangement, the drive mounting is made of wood or metal material.

As an alternative to the seat extension arrangement, the drive member is a linear motor or a gas spring.

In another aspect, a seat is provided comprising a seat extension arrangement as described in any one of the above.

Compared with the prior art, the utility model has the beneficial effects that:

according to the seat stretching device and the seat, the backrest unit and/or the leg placing unit are driven by the independent driving components, so that the backrest unit and/or the leg placing unit can be independently controlled, the driving components can drive the corresponding backrest unit or leg placing unit to stretch or furl only through the driving pieces and the driving connecting pieces, multiple posture adjustment can be met, the structure is simple, the number of connecting rods is small, assembly, disassembly and transportation are facilitated, and cost reduction is facilitated.

Drawings

FIG. 1 is a first schematic view of a first seat extension apparatus according to an embodiment of the present invention;

FIG. 2 is a second schematic structural view of a first seat extension apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a first seat extension apparatus according to an embodiment of the present invention;

FIG. 4 is a first schematic view of a second seat extension apparatus according to an embodiment of the present invention;

FIG. 5 is a second schematic structural view of a second seat extension apparatus according to an embodiment of the present invention;

FIG. 6 is a third schematic view of a second seat extension apparatus according to an embodiment of the present invention;

FIG. 7 is a schematic perspective view of a second seat extension apparatus in accordance with an embodiment of the present invention;

FIG. 8 is a first schematic view of a third embodiment of a seat extension apparatus according to the present invention;

FIG. 9 is a second schematic structural view of a third seat extension apparatus according to an embodiment of the present invention;

FIG. 10 is a third schematic view of a third example seat extension apparatus in accordance with the present invention;

FIG. 11 is a fourth schematic structural view of a third seat extension apparatus in accordance with an embodiment of the present invention;

FIG. 12 is a schematic perspective view of a third seat extension apparatus in accordance with an embodiment of the present invention;

FIG. 13 is a first schematic view of a fourth example seat extension apparatus according to the present invention;

FIG. 14 is a second schematic view of a fourth example seat extension apparatus in accordance with the present invention;

FIG. 15 is a first schematic view of a fifth example seat extension apparatus according to the present invention;

fig. 16 is a second schematic structural view of a fifth seat extension device according to an embodiment of the utility model.

Reference numerals:

1. an extension assembly; 11. a backrest unit; 111. a backrest support frame; 112. a backrest connection assembly; 1121. a backrest adapter; 11211. a first transition end; 11212. a second transition end; 11213. a third transition end; 1122. A backrest connector; 113. a transfer mounting member; 12. a seat frame unit; 121. a seat frame support frame; 122. a seat frame connecting piece; 123. a leg rest support; 1231. a slider; 13. a leg rest unit; 131. a leg rest frame; 132. A leg rest connector; 1321. a first connection portion; 1322. a second connecting portion; 1323. a leg rest chute; 13231, a first groove section; 13232. a second groove section;

2. a drive assembly; 21. a drive member; 22. a drive connection; 221. a backrest drive link; 222. a leg rest drive connection; 2221. a first drive connection; 22211. a first connection end; 2222. a second drive connection; 22221. a second connection end; 2223. a third drive connection; 22231. a third connection end; 222311, leg rest connecting pin; 2224. a fourth drive connection; 2225. a chute; 23. the mounting member is driven.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1 to 3, the present embodiment provides a seat stretching apparatus, which includes a stretching assembly 1 and a driving assembly 2, wherein the stretching assembly 1 includes a backrest unit 11, a seat frame unit 12 and a leg rest unit 13, and two ends of the seat frame unit 12 in the front-back direction are respectively pivoted with the backrest unit 11 and the leg rest unit 13; the driving assembly 2 comprises a driving member 21 and a driving connecting member 22, two ends of the driving connecting member 22 in the front-back direction are respectively pivoted with the backrest unit 11 and the leg rest unit 13, two ends of the driving member 21 are respectively pivoted with the backrest unit 11 and the seat frame unit 12, so that the driving member 21 can drive the backrest unit 11 and the leg rest unit 13 to synchronously extend or retract, and the extending assembly 1 can be switched between a sitting posture state and a lying posture state.

The driving piece 21 can drive the backrest unit 11 and the leg placing unit 13 to synchronously extend or furl through the driving connecting piece 22, can meet the requirement of adjusting various postures, and is simple in structure, small in number of connecting rods, convenient to assemble, disassemble and transport and beneficial to reducing cost.

Optionally, the driving member 21 is located at the middle of the extension assembly 1 in the width direction, so that the force applied to the backrest unit 11 and the leg rest unit 13 can be more smoothly applied to ensure that the backrest unit 11 and the leg rest unit 13 move smoothly. Wherein the width direction is perpendicular to the front-back direction.

Alternatively, the drive links 22 are arranged in pairs, the drive assembly 2 comprising a plurality of pairs of drive links 22; in any pair of driving links 22, the two driving links 22 are located at two sides of the driving member 21 and are symmetrically arranged. The driving connecting pieces 22 arranged in pairs are used for supporting and transmitting, so that the stress stability of the backrest unit 11 and the leg rest unit 13 can be further improved, and the stable movement of the backrest unit and the leg rest unit can be ensured.

Optionally, leg rest unit 13 comprises leg rest frame 131 and leg rest connector 132, leg rest connector 132 is fixedly arranged at the bottom of one end of leg rest frame 131 close to seat frame unit 12; leg rest connecting element 132 includes first connecting portion 1321 and second connecting portion 1322 that set up and fixed connection at an interval, first connecting portion 1321 and seat frame unit 12 pin joint, second connecting portion 1322 and drive connecting element 22 pin joint. Leg rest connector 132 integrates first connector 1321 and second connector 1322 to facilitate efficient assembly of leg rest platform 131 with seat frame unit 12 and drive connector 22.

Optionally, a plurality of leg rest connectors 132 are provided, and the second connecting portions 1322 of the leg rest connectors 132 are pivotally connected to the driving connectors 22 in a one-to-one correspondence. In other words, a plurality of leg rest links 132 are provided in one-to-one correspondence with a plurality of drive links 22. The plurality of leg rest connectors 132 can make the connection of the leg rest 131 with the seat frame unit 12 and the driving connector 22 more stable, and also can make the movement of the leg rest 131 more stable.

Alternatively, the second connecting portion 1322 has one end fixedly connected to the bottom of the leg rest 131 and the other end inclined toward the seat frame unit 12 and pivotally connected to the driving link 22. The end of the second connecting portion 1322 connected to the leg rest bracket 131 can be further close to the middle of the leg rest bracket 131 in the front-rear direction, and when the leg rest unit 13 is unfolded, the leg rest bracket 131 can be supported well, so that the leg of the user can be stably supported by the leg rest bracket 131.

Optionally, the backrest unit 11 includes a backrest support frame 111 and two backrest connecting assemblies 112 respectively disposed at two ends of the backrest support frame 111 in the width direction and symmetrically disposed. The backrest connecting assembly 112 includes a backrest adapter 1121 and a backrest connecting member 1122, the backrest adapter 1121 includes a first adapting end 11211, a second adapting end 11212 and a third adapting end 11213 which are arranged in a triangle, the first adapting end 11211 is fixedly connected with the backrest support frame 111, the second adapting end 11212 is pivoted with the seat frame unit 12, the third adapting end 11213 is fixedly connected with one end of the backrest connecting member 1122, and the other end of the backrest connecting member 1122 is pivoted with the driving member 21 and the driving connecting member 22. The back link 1122 serves to extend the third switching end 11213 such that the third switching end 11213 can be connected to the drive assembly 2 and avoid interference with the seat frame unit 12. The backrest transition piece 1121 is used for performing a transition function between the backrest support frame 111 and the seat frame unit 12 and the driving assembly 2, so that the assembly efficiency of the backrest unit 11 and the seat frame unit 12 and the driving assembly 2 can be improved, and meanwhile, the backrest transition piece 1121 can be matched with backrest support frames 111 of different models, thereby being beneficial to reducing the development cost of parts.

Optionally, the backrest unit 11 further includes an adaptor mounting member 113, two ends of the adaptor mounting member 113 in the width direction are respectively and fixedly connected to the backrest connecting members 1122 of the two backrest connecting members 112, so that the two backrest connecting members 1122 are connected into a whole through the adaptor mounting member 113, which has a reinforcing function, and then the driving member 21 and the driving connecting member 22 are both pivotally connected to the adaptor mounting member 113, so that the driving member 21 and the driving connecting member 22 are stably supported by the whole.

Optionally, the seat frame unit 12 includes a seat frame support frame 121 and seat frame connecting pieces 122 disposed in one-to-one correspondence with the two backrest connecting components 112, one end of each seat frame connecting piece 122 is fixedly connected to the seat frame support frame 121, and the other end of each seat frame connecting piece 122 is pivotally connected to the corresponding second adapting end 11212, so that the seat frame support frame 121 and the backrest support frame 111 can be connected, and the assembly efficiency of the seat frame unit 12 and the backrest unit 11 is improved. In addition, the seat frame connecting piece 122 can be matched with seat frame supporting frames 121 of different models, and the development cost of parts can be reduced.

In this embodiment, the driving member 21 is a gas spring, and the driving force provided by the gas spring is smoother. In other embodiments, the driving member 21 may be a linear motor, which has the advantage of fast response speed.

In the seat stretching device of the present embodiment, in a sitting posture, the top surface of the leg rest frame 131 is perpendicular to the horizontal plane, and the included angle between the backrest support frame 111 and the seat frame support frame 121 is a; in the lying position, the top surface of the leg rest frame 131 is parallel to the horizontal plane, the included angle between the backrest support frame 111 and the seat frame support frame 121 is b, and b is greater than a. Illustratively, a is 110 ° and b is 144 °. In use, a user can activate the actuator 21 to switch the seat extension arrangement between the sitting and recumbent positions. Of course, the user can also control the driving member 21 to stop at any time during the above switching process to maintain the seat extending device in a certain state (a state between the sitting state and the lying state).

As shown in fig. 4-7, the present embodiment further provides a seat stretching apparatus, which includes a stretching assembly 1 and a driving assembly 2, wherein the stretching assembly 1 includes a seat frame unit 12, a backrest unit 11 and a leg rest unit 13, and two ends of the seat frame unit 12 in the front-back direction are respectively pivoted with the backrest unit 11 and the leg rest unit 13; the driving assembly 2 comprises a driving member 21, a backrest driving connecting member 221 and a leg rest driving connecting member 222, one end of the backrest driving connecting member 221 is pivoted with the backrest unit 11, the other end of the backrest driving connecting member is pivoted with one end of the leg rest driving connecting member 222, the other end of the leg rest driving connecting member 222 is connected with the leg rest unit 13, the driving member 21 is used for driving the leg rest driving connecting member 222 to translate along the front-back direction, so that the leg rest unit 13 and the backrest unit 11 can be sequentially extended or retracted, and the extension assembly 1 can be sequentially switched among a sitting posture state, a TV posture state and a lying posture state.

Compared with the stretching device in the prior art, the seat stretching device has the advantages that the driving piece 21 can drive the leg placing driving connecting piece 222 to translate along the front-back direction and drive the backrest driving connecting piece 221 to act, so that the leg placing unit 13 and the backrest unit 11 can be sequentially stretched or folded, various posture adjustments can be met, the structure is simple, the number of connecting rods is small, the assembly, the disassembly and the transportation are convenient, and the cost is reduced.

Optionally, leg rest unit 13 comprises leg rest frame 131 and leg rest connector 132, leg rest frame 131 being pivotally connected to seat frame unit 12; leg-rest connector 132 is fixedly arranged at the bottom of one end of leg-rest plate frame 131 close to seat frame unit 12; leg rest connecting piece 132 is provided with leg rest sliding slot 1323, leg rest connecting pin 222311 is arranged at the end of leg rest driving connecting piece 222, and leg rest connecting pin 222311 penetrates leg rest sliding slot 1323 and can slide along leg rest sliding slot 1323 to drive leg rest board frame 131 to unfold or fold. So set up, make leg rest drive connector 222 and leg rest board frame 131 adopt gliding mode to be connected, simple structure on the one hand, the assembly of being convenient for, on the other hand can make leg rest drive connector 222 provide more stable support to leg rest board frame 131, and then makes leg rest board frame 131 can stably support user's shank.

Optionally, leg rest chute 1323 includes a first chute section 13231 and a second chute section 13232, which are sequentially disposed and communicated with each other along the sliding direction of leg rest connecting pin 222311, and an included angle is formed between first chute section 13231 and second chute section 13232; leg rest link pin 222311 is located at an end of first slot segment 13231 distal from second slot segment 13232 when extension assembly 1 is in a sitting position; leg rest link pin 222311 is located at the junction of first slot segment 13231 and second slot segment 13232 when extension assembly 1 is in the TV pose position; leg rest link pin 222311 is located at an end of second slot segment 13232 distal from first slot segment 13231 when extension assembly 1 is in a recumbent position. In this embodiment, the first trough section 13231 is disposed obliquely, the second trough section 13232 is disposed horizontally, and the length of the first trough section 13231 is less than the length of the second trough section 13232, so as to control the speed at which the leg rest 131 is unfolded by the first trough section 13231, and control the levelness of the leg rest 131 by the second trough section 13232.

Optionally, there are two leg rest chutes 1323, and both ends of leg rest connecting pin 222311 are respectively located in two leg rest chutes 1323. Leg rest connector 132 includes two oppositely disposed connecting pieces, both of which are provided with leg rest chutes 1323, in other words, leg rest chutes 1323 on both connecting pieces are oppositely disposed, so that both ends of leg rest connecting pin 222311 are respectively penetrated into leg rest chutes 1323 of both connecting pieces, so that leg rest drive connector 222 can provide stable support for leg rest plate frame 131 through leg rest connecting pin 222311.

Optionally, the leg rest driving link 222 includes a first connecting end 22211, a second connecting end 22221 and a third connecting end 22231, the first connecting end 22211 is pivotally connected to the backrest driving link 221, the second connecting end 22221 is connected to the driving member 21, and a leg rest connecting pin 222311 is disposed at the third connecting end 22231.

In this embodiment, the leg-rest driving connection member 222 includes a first driving connection portion 2221, a second driving connection portion 2222, a third driving connection portion 2223, and a fourth driving connection portion 2224, which are all rod-shaped structures, the fourth driving connection portion 2224 extends in a front-back direction, the first driving connection portion 2221, the second driving connection portion 2222, and the third driving connection portion 2223 all extend in a vertical direction, the first driving connection portion 2221 and the third driving connection portion 2223 are connected to one side of the fourth driving connection portion 2224, the first driving connection portion 2221 and the third driving connection portion 2223 are respectively located at front and back ends of the fourth driving connection portion 2224, and the second driving connection portion 2222 is connected to the other side of the fourth driving connection portion 2224 and located at a back end of the fourth driving connection portion 2224. The first connection end 22211 is an end of the first drive connection portion 2221 away from the fourth drive connection portion 2224, the second connection end 22221 is an end of the second drive connection portion 2222 away from the fourth drive connection portion 2224, and the third connection end 22231 is an end of the third drive connection portion 2223 away from the fourth drive connection portion 2224.

In this embodiment, an end of the leg-rest driving connecting member 222 away from the leg-rest unit 13 is slidably connected to the seat frame unit 12, that is, the second driving connecting portion 2222 is slidably connected to the seat frame unit 12 and connected to the driving member 21, so as to ensure that the leg-rest driving connecting member 222 can stably translate under the driving of the driving member 21. Further, a leg rest support 123 is provided at an end of the seat frame unit 12 close to the leg rest unit 13, and a leg rest driving link 222 is slidably connected to the leg rest support 123. So as to support the end of the leg rest drive link 222 close to the leg rest unit 13, i.e., the front end of the fourth drive link 2224 (i.e., the end of the fourth drive link 2224 away from the back unit 11 in the front-rear direction of the sofa), with the leg rest support 123.

Optionally, one of leg rest support 123 and leg rest drive link 222 is provided with a sliding slot 2225, and the other is provided with a sliding block 1231, and sliding block 1231 is slidably disposed in sliding slot 2225; when the stretching assembly 1 is in a sitting posture, the sliding block 1231 is positioned at one end of the sliding groove 2225; when the extension assembly 1 is in the lying position, the sliding block 1231 is located at the other end of the sliding groove 2225. In this embodiment, leg rest drive link 222 has a slot 2225 and leg rest support 123 has a slide 1231. It will be appreciated that the sliding slot 2225 and the sliding block 1231 are slidably engaged to support the leg rest driving connection member 222, and the sliding slot 2225 is utilized to control the progress of the actions of the backrest unit 11 and the leg rest unit 13.

Optionally, the backrest unit 11 includes a backrest support frame 111 and two backrest connecting assemblies 112 respectively disposed at two ends of the backrest support frame 111 in the width direction, and the width direction is perpendicular to the front-back direction. The backrest connecting assembly 112 includes a backrest adapter 1121 and a backrest connecting member 1122, the backrest adapter 1121 includes a first adapting end 11211, a second adapting end 11212 and a third adapting end 11213 which are arranged in a triangle, the first adapting end 11211 is fixedly connected with the backrest support frame 111, the second adapting end 11212 is pivoted with the seat frame unit 12, the third adapting end 11213 is fixedly connected with one end of the backrest connecting member 1122, and the other end of the backrest connecting member 1122 is pivoted with the backrest driving connecting member 221. The back link 1122 serves to extend the third switching end 11213 such that the third switching end 11213 can be connected to the back driving link 221 and avoid interference with the seat frame unit 12. The backrest transition piece 1121 plays a role in transition between the backrest support frame 111 and the seat frame unit 12 and the backrest driving connection piece 221, so that the assembly efficiency of the backrest unit 11 and the seat frame unit 12 and the backrest driving connection piece 221 can be improved, and meanwhile, the backrest transition piece 1121 can be matched with backrest support frames 111 of different models, thereby being beneficial to reducing the development cost of parts.

Optionally, the backrest unit 11 further includes an adaptor mount 113, and both ends of the adaptor mount 113 in the width direction are fixedly connected to the backrest connectors 1122 of the two backrest connecting assemblies 112, respectively. The two backrest connecting members 1122 are connected to each other by the adapter mounting members 113 to form a single body, thereby providing reinforcement.

Further, one end of the backrest driving connecting member 221 is pivotally connected to the adaptor mounting member 113, and the other end is pivotally connected to the first connecting portion 22211, so that an N-shaped structure is formed among the adaptor mounting member 113, the backrest driving connecting member 221 and the first driving connecting portion 2221. The N-shaped structure has large deformation along the front-back direction, and can effectively reduce the occupied space of the transmission structure on the basis of ensuring the unfolding angle of the backrest support frame 111.

Optionally, back drive link 221 and leg rest drive link 222 are located at the middle of the width of extension assembly 1. Thereby, the force applied to the backrest unit 11 and the leg rest unit 13 can be more smoothly, and the backrest unit 11 and the leg rest unit 13 can be ensured to move smoothly.

Optionally, the seat frame unit 12 includes a seat frame support frame 121 and seat frame connecting pieces 122 disposed in one-to-one correspondence with the two backrest connecting components 112, one end of each seat frame connecting piece 122 is fixedly connected to the seat frame support frame 121, and the other end of each seat frame connecting piece 122 is pivotally connected to the corresponding second adapting end 11212, so that the seat frame support frame 121 and the backrest support frame 111 can be connected, and the assembly efficiency of the seat frame unit 12 and the backrest unit 11 is improved. In addition, the seat frame connecting piece 122 can be matched with seat frame supporting frames 121 of different models, and the development cost of parts can be reduced.

Exemplarily, the driving member 21 includes a ball screw mechanism and a rotating motor, the ball screw mechanism includes a screw rod extending along the front-back direction and a nut sleeved outside the screw rod and screwed with the screw rod, and the leg-rest driving connecting member 222 is fixedly connected with the nut; the rotating motor is used for driving the screw rod to rotate so that the nut can translate along the screw rod. The driving mode that the rotating motor is matched with the ball screw mechanism is adopted, the displacement of the leg placing driving connecting piece 222 can be accurately measured, and the control precision is high. In other embodiments, the driving member 21 can also be directly a linear motor, so that the assembly is more convenient.

Alternatively, the rotary motor or the linear motor may be fixedly mounted to the seat frame unit 12 through a driving mounting bracket, and the motor mounting bracket is made of a metal material and has a specific shape so as to ensure that the motor is firmly mounted. In other embodiments, the drive mounting frame can be made of wood, and the cost is saved.

In the seat stretching device of the present embodiment, in a sitting posture, the top surface of the leg rest frame 131 is perpendicular to the horizontal plane, and the included angle between the backrest support frame 111 and the seat frame support frame 121 is a; in the TV posture state, the top surface of the leg rest frame 131 is parallel to the horizontal plane, and the included angle between the backrest support frame 111 and the seat frame support frame 121 is a; in the lying state, the top surface of the leg rest frame 131 is parallel to the horizontal plane, the included angle between the backrest support frame 111 and the seat frame support frame 121 is b, and b is greater than a. Illustratively, a is 110 ° and b is 144 °. In use, a user can activate the actuator 21 to switch the seat extension apparatus between a sitting position and a TV-position, TV-position and a recumbent position. Of course, the user can also control the actuator 21 to stop at any time during the above-described switching process to maintain the seat extension in a certain state (a state between the sitting and TV-posture states or a state between the TV-posture and recumbent-posture states).

Illustratively, the seat extension apparatus of the present embodiment operates on the following principle:

in a sitting posture state, the driving member 21 is started, the driving member 21 drives the leg rest driving connecting member 222 to translate forwards along the front-back direction, the leg rest unit 13 can be driven to unfold by the leg rest driving connecting member 222, when the leg rest unit 13 is completely unfolded, the extension assembly 1 is in a TV posture state, the leg rest driving connecting member 222 continues to translate under the driving of the driving member 21, and then the backrest unit 11 is driven to unfold by the backrest driving connecting member 221 until the extension assembly 1 is in a lying posture state; on the contrary, in the lying posture state, the driving member 21 is started, the driving member 21 drives the leg rest driving connecting member 222 to move backwards along the front-back direction, the leg rest driving connecting member 222 drives the backrest driving connecting member 221, the backrest driving connecting member 221 drives the backrest unit 11 to fold, when the backrest unit 11 is completely folded, the extension assembly 1 is in the TV posture state, the leg rest driving connecting member 222 continues to move backwards under the driving of the driving member 21, and then the leg rest unit 13 is driven to fold until the extension assembly 1 is in the sitting posture state.

As shown in fig. 8-12, the present embodiment further provides a seat stretching apparatus, which includes a stretching assembly 1 and two driving assemblies 2, wherein the stretching assembly 1 includes a seat frame unit 12, a backrest unit 11 and a leg rest unit 13, the backrest unit 11 and the leg rest unit 13 are respectively located at two ends of the seat frame unit 12 along the front-back direction, and both the backrest unit 11 and the leg rest unit 13 are pivotally connected to the seat frame unit 12; the two driving assemblies 2 are arranged in one-to-one correspondence with the backrest unit 11 and the leg rest unit 13; the driving assembly 2 includes a driving member 21 and a driving connecting member 22, one end of the driving member 21 is pivotally connected to the seat frame unit 12, the other end of the driving member 21 is pivotally connected to one end of the driving connecting member 22, and the other end of the driving connecting member 22 is fixedly connected to the backrest unit 11 or the leg rest unit 13 to drive the backrest unit 11 or the leg rest unit 13 to extend or retract.

Backrest unit 11 and leg rest unit 13 are driven through independent drive assembly 2 to make backrest unit 11 and leg rest unit 13 realize independent control, and drive assembly 2 only can drive corresponding backrest unit 11 or leg rest unit 13 through driving piece 21 and drive connecting piece 22 and extend or draw in, can satisfy multiple gesture and adjust, and simple structure, the connecting rod is small in quantity, is convenient for assemble and split transportation, is favorable to reduce cost.

Alternatively, in the driving assembly 2 corresponding to the backrest unit 11, the driving link 22 has an arc shape, and the arc shape is arched away from the seat frame unit 12 to function as a back-ward unit for the seat frame unit 12.

Optionally, the leg rest unit 13 comprises a leg rest frame 131 and a leg rest connector 132, the leg rest connector 132 is fixedly disposed at the bottom of one end of the leg rest frame 131 close to the seat frame unit 12, and the leg rest connector 132 is pivotally connected to the seat frame unit 12.

Optionally, the backrest unit 11 includes a backrest support frame 111 and two backrest adapters 1121 respectively disposed at two ends of the backrest support frame 111 in the width direction, and the width direction is perpendicular to the front-back direction. The backrest adapter 1121 includes a first adapter end 11211, a second adapter end 11212 and a third adapter end 11213, which are disposed in a triangular shape, the first adapter end 11211 is fixedly connected to the backrest support frame 111, the second adapter end 11212 is pivotally connected to the seat frame unit 12, and the third adapter end 11213 is fixedly connected to the driving connector 22. The backrest adapter 1121 is used for performing an adapter function between the backrest support frame 111 and the seat frame unit 12 and the driving connector 22, so that the assembly efficiency of the backrest unit 11 and the seat frame unit 12 and the driving connector 22 can be improved, and meanwhile, the backrest adapter 1121 can be matched with backrest support frames 111 of different models, thereby being beneficial to reducing the development cost of parts.

Optionally, in the driving assembly 2 corresponding to the backrest unit 11, two driving connectors 22 are provided, one end of each of the two driving connectors 22 is fixedly connected to the third switching end 11213 of each of the two backrest switching pieces 1121 in a one-to-one correspondence manner, and the two driving connectors 22 are utilized to apply force to the two ends of the backrest supporting frame 111 in the width direction, which is beneficial to make the backrest supporting frame 111 move stably. The backrest unit 11 further includes an adaptor mounting member 113, two ends of the adaptor mounting member 113 along the width direction are respectively fixedly connected to the other ends of the two driving connecting members 22, the adaptor mounting member 113 is pivotally connected to the driving member 21, the two driving connecting members 22 can be butt-jointed to the driving member 21 by using the adaptor mounting member 113, and the adaptor mounting member 113 connects the two driving connecting members 22 to form a whole, so that the strength is higher and the stability is higher.

Optionally, the seat frame unit 12 includes a seat frame support frame 121 and seat frame connecting pieces 122 disposed in one-to-one correspondence with the two backrest connectors 1121, one end of each seat frame connecting piece 122 is fixedly connected to the seat frame support frame 121, and the other end of each seat frame connecting piece 122 is pivotally connected to the corresponding second adapter end 11212, so that the seat frame support frame 121 and the backrest support frame 111 can be connected, which is beneficial to improving the assembling efficiency of the seat frame unit 12 and the backrest unit 11. In addition, the seat frame connecting piece 122 can be matched with seat frame supporting frames 121 of different models, and the development cost of parts can be reduced.

Optionally, in the driving assembly 2 corresponding to the leg rest unit 13, one end of the driving connecting member 22 is fixedly connected to the bottom of one end of the leg rest unit 13 close to the seat frame unit 12, and the other end is inclined in a direction away from the seat frame unit 12 and pivotally connected to the driving member 21, so as to ensure that the driving member 21 can drive the corresponding leg rest unit 13 to turn in a predetermined direction through the driving connecting member 22 when acting.

In this embodiment, the driving member 21 is a gas spring, and the driving force provided by the gas spring is smoother. In other embodiments, the driving member 21 may be a linear motor, which has the advantage of fast response speed.

In the seat stretching device of the present embodiment, in a sitting posture, the top surface of the leg rest frame 131 is perpendicular to the horizontal plane, and the included angle between the backrest support frame 111 and the seat frame support frame 121 is a; in the TV posture state, the top surface of the leg rest frame 131 is parallel to the horizontal plane, and the included angle between the backrest support frame 111 and the seat frame support frame 121 is a; in the lying posture state, the top surface of the leg-rest plate frame 131 is parallel to the horizontal plane, the included angle between the backrest support frame 111 and the seat frame support frame 121 is b, and b is greater than a; in the semi-lying posture, the top surface of the leg rest frame 131 is perpendicular to the horizontal plane, and the angle between the backrest support frame 111 and the seat frame support frame 121 is b. Illustratively, a is 110 ° and b is 144 °. In use, a user can activate the actuator 21 to switch the seat extension between the sitting, TV, lie flat and semi-lie positions. Of course, the user can also control the actuator 21 to stop at any time during the above switching process to maintain the seat extension apparatus in a certain state (i.e., one state between any two states of the sitting state, the TV posture state, the lying posture state, and the semi-lying posture state).

In other embodiments, as shown in fig. 13-16, it may also be provided that: one of the backrest unit 11 and the leg rest unit 13 is pivotally connected to the seat frame unit 12; one driving unit 2 is provided, and the driving unit 2 is provided to correspond to the backrest unit 11 or the leg rest unit 13 pivotally connected to the seat frame unit 12. The driving assembly 2 comprises a driving member 21 and a driving connecting member 22, wherein one end of the driving member 21 is pivotally connected to the seat frame unit 12, the other end of the driving member 21 is pivotally connected to one end of the driving connecting member 22, and the other end of the driving connecting member 22 is fixedly connected to the backrest unit 11 or the leg rest unit 13 to drive the backrest unit 11 or the leg rest unit 13 to extend or retract.

As shown in fig. 13-14, when the backrest unit 11 is pivoted to the seat frame unit 12 only, the leg rest unit 13 is fixed or not provided, for example, a wood board may be added to the front end of the seat frame unit 12 (i.e. the end of the seat frame unit 12 away from the backrest unit 11 along the front-back direction of the sofa) by the sofa manufacturer to be fixedly connected to the seat frame unit 12, and the extension assembly 1 may be switched between the sitting posture state and the semi-lying posture state under the driving of the driving assembly 2. Of course, the user can also control the drive assembly 2 to stop at any time during the above-described switching process to maintain the seat extension apparatus in a certain state (i.e., a state between the sitting state and the semi-reclined state). Can satisfy multiple gesture and adjust, and simple structure, the connecting rod is small in quantity, is convenient for assemble and split transportation, is favorable to reduce cost.

As shown in fig. 15-16, when the leg rest unit 13 is pivoted to the seat frame unit 12, the backrest unit 11 is fixedly connected to the seat frame unit 12, for example, the backrest unit 11 may be connected to the seat frame unit 12 in a plug-in manner, that is, by fixing the connectors on the backrest support frame and the armrest support frame, the backrest angle cannot be adjusted, and the extension assembly 1 can be switched between the sitting posture state and the TV posture state under the driving of the driving assembly 2. Of course, the user can also control the drive assembly 2 to stop at any time during the above-described switching process to maintain the seat extension apparatus in a certain state (i.e., a state between the sitting state and the TV-posture state). Can satisfy multiple gesture and adjust, and simple structure, the connecting rod is small in quantity, is convenient for assemble and split transportation, is favorable to reduce cost.

Optionally, when one of the backrest unit 11 and the leg rest unit 13 is pivotally connected to the seat frame unit 12, the driving assembly 2 further includes a driving installation member 23, one end of the driving installation member 23 is fixedly connected to the seat frame unit 12, and the other end is pivotally connected to the driving member 21.

Optionally, the drive mounting member 23 is made of a metal material with a specific shape to ensure a secure motor mounting. In other embodiments, the drive mounting member 23 may be made of wood, which provides a cost savings advantage. Illustratively, the wooden drive mount 23 is a U-shaped structure that does not interfere with other components. Two ends of the U-shaped structure are respectively fixedly connected with two ends of the seat frame unit 12 in the width direction, and the motor is pivoted in the middle of the U-shaped structure.

The embodiment also provides a seat comprising the seat stretching device.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A seat extension apparatus, comprising:

the stretching assembly (1) comprises a seat frame unit (12), a backrest unit (11) and a leg rest unit (13), wherein the backrest unit (11) and the leg rest unit (13) are respectively positioned at two ends of the seat frame unit (12) along the front-back direction, and at least one of the backrest unit (11) and the leg rest unit (13) is pivoted with the seat frame unit (12);

the driving assemblies (2) are arranged in one-to-one correspondence with the backrest units (11) and/or the leg rest units (13) which are pivoted with the seat frame units (12); drive assembly (2) include driving piece (21) and drive connecting piece (22), the one end of driving piece (21) with seat frame unit (12) pin joint, the other end of driving piece (21) with the one end pin joint of drive connecting piece (22), the other end of drive connecting piece (22) with back unit (11) or put leg unit (13) fixed connection, in order to drive back unit (11) or put leg unit (13) and extend or draw in.

2. The seat stretching apparatus as claimed in claim 1, wherein in the driving assembly (2) corresponding to the back unit (11), the driving link (22) is arc-shaped, and the arc-shape is arched away from the seat frame unit (12).

3. The seat extension apparatus according to claim 2, wherein the backrest unit (11) includes a backrest support frame (111) and two backrest adapters (1121) symmetrically disposed at both ends of the backrest support frame (111) in a width direction, the width direction being perpendicular to the front-rear direction;

the backrest transition piece (1121) comprises a first transition end (11211), a second transition end (11212) and a third transition end (11213) which are arranged in a triangular shape, the first transition end (11211) is fixedly connected with the backrest support frame (111), the second transition end (11212) is pivoted with the seat frame unit (12), and the third transition end (11213) is fixedly connected with the driving connecting piece (22).

4. The seat extension arrangement according to claim 3, characterized in that in the drive assembly (2) corresponding to the backrest unit (11), there are two drive links (22), and one end of the two drive links (22) is fixedly connected with the third swivel end (11213) of the two backrest swivels (1121) in a one-to-one correspondence;

the backrest unit (11) further comprises a switching installation part (113), the two ends of the switching installation part (113) in the width direction are respectively fixedly connected with the other ends of the two driving connecting pieces (22), and the switching installation part (113) is pivoted with the driving piece (21).

5. The seat stretching apparatus as claimed in claim 3, wherein the seat frame unit (12) comprises a seat frame support frame (121) and seat frame connecting members (122) corresponding to the two backrest transition members (1121), one end of each seat frame connecting member (122) is fixedly connected to the seat frame support frame (121), and the other end is pivotally connected to the corresponding second transition end (11212).

6. Seat stretching apparatus as in claim 1, characterized in that in said driving assembly (2) corresponding to said leg rest unit (13), said driving link (22) has one end fixedly connected to the bottom of said leg rest unit (13) at the end near said seat frame unit (12) and the other end inclined away from said seat frame unit (12) and pivotally connected to said driving member (21).

7. The seat stretching apparatus as claimed in claim 1, wherein the driving assembly (2) further comprises a driving mount (23) when one of the backrest unit (11) and the leg rest unit (13) is pivotally connected to the seat frame unit (12), the driving mount (23) having one end fixedly connected to the seat frame unit (12) and the other end pivotally connected to the driving member (21).

8. The seat extension arrangement according to claim 7, wherein the drive mount (23) is made of wood or metal material.

9. Seat stretching device according to claim 1, wherein the drive member (21) is a linear motor or a gas spring.

10. A seat comprising a seat extension arrangement as claimed in any one of claims 1 to 9.

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