CN116763076A - Lifting base and seat unit - Google Patents

Abstract

The invention provides a lifting base and a seat unit, wherein the lifting base comprises: a top plate; a bottom plate; the lifting mechanism is adjustably arranged between the top plate and the bottom plate and is respectively and pivotally connected to the top plate and the bottom plate; a driving unit including a driving end connected to the top plate or the lifting mechanism to drive the top plate away from or close to the bottom plate so that the lifting base is switched between an extended posture or a storage posture; a reset member; when the lifting base is in the storage posture, the reset piece acts on the top plate or the lifting mechanism so that the top plate has a movement trend away from the bottom plate. When the lifting base is switched from the storage posture to the stretching posture, the reset piece can assist the driving unit to reduce the load of the driving unit, and the service life of the driving unit can be effectively prolonged.

Description

Lifting base and seat unit

Technical Field

The invention relates to the technical field of seat supports, in particular to a lifting base and a seat unit.

Background

The common functional seat uses telescopic parts such as an air cylinder and the like as supporting and driving elements when the height is adjusted, the structure is simple, the adjustment feedback is rapid, but the junction of the telescopic parts can determine that the contact area between the telescopic parts and the seat main body is small, namely the strength of the connecting structure between the telescopic parts is not high enough, meanwhile, when the functional seat is used by a user, the functional seat is generally in a sitting posture state and can be adjusted in height, and other functional seats such as the lying posture state have poor stability, easy tipping phenomenon and poor safety when the height is adjusted through the telescopic parts;

in order to overcome the above-mentioned drawbacks, a driving device with high stability has been developed in the prior art, for example, an old man chair driving device with stable lifting function disclosed in chinese patent publication No. CN213640251U, which includes a base frame, a driving mechanism and a lifting mechanism; the driving mechanism comprises a driving connecting piece and a driving rod, the driving connecting piece is arranged in the middle of the driving rod, and the driving connecting piece is used for being in driving connection with the driving source; the lifting mechanism comprises lifting frames, lifting frame connecting pieces, lifting assemblies and lifting assembly connecting plates, one ends of the lifting frame connecting pieces are connected with the connecting driving rods, the other ends of the lifting frame connecting pieces are rotationally connected with the lifting assembly connecting plates, two lifting frame connecting pieces are arranged, and the two lifting frame connecting pieces are symmetrically arranged on two sides of the driving connecting pieces; the lifting assembly connecting plate is connected with the lifting frame and the lifting assembly; the driving rod and the lifting frame are connected through the lifting frame connecting pieces symmetrically arranged on two sides of the driving connecting piece, so that connection stress points between the driving rod and the lifting frame are symmetrically distributed on two sides of the driving force stress point, and the lifting frame is more stable and difficult to shake in the lifting process. However, in the above patent, the motion adjustment of the driving device is realized by the driving motor, and when the driving device performs the instantaneous or initial period of the posture adjustment from bottom to top, the driving motor is heavy in load, and the service life of the driving motor is easily affected.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide the lifting base, when the storage posture is switched to the stretching posture, the reset piece can assist the driving unit to reduce the load of the driving unit, and the service life of the driving unit can be effectively prolonged.

Another object of the present invention is to provide a seat unit that can achieve stable posture adjustment, and has a long service life.

The embodiment of the invention is realized by the following technical scheme:

a lifting base comprising: a top plate; a bottom plate; the lifting mechanism is adjustably arranged between the top plate and the bottom plate and is respectively and pivotally connected to the top plate and the bottom plate; a driving unit including a driving end connected to the top plate or the lifting mechanism to drive the top plate away from or close to the bottom plate so that the lifting base is switched between an extended posture or a storage posture; a reset member; when the lifting base is in the storage posture, the reset piece acts on the top plate or the lifting mechanism so that the top plate has a movement trend away from the bottom plate.

According to a preferred embodiment, when the lifting base is switched from the extended posture to the storage posture, and the lifting base is brought toward the storage posture, the return member acts on the top plate or the lifting mechanism to block the top plate from approaching the bottom plate.

According to a preferred embodiment, the reset element comprises an elastic element, which is arranged between the top plate and the bottom plate; the top plate is far away from the bottom plate along a first direction, the top plate is close to the bottom plate along a second direction, and the first direction is opposite to the second direction; the elastic piece is arranged along the first direction in an extending way; when the lifting base is in the storage posture, the top plate or the lifting mechanism is abutted to one end, far away from the bottom plate, of the elastic piece so as to compress the elastic piece.

According to a preferred embodiment, the return element further comprises a first guide bar slidably connected to the base plate; the axial direction of the first guide rod is parallel to the first direction; the elastic piece is a spring, the spring is sleeved outside the first guide rod, a first limiting structure is arranged at one end part of the first guide rod, which is close to the top plate, and the spring is positioned between the bottom plate and the first limiting structure.

According to a preferred embodiment, the base plate comprises a second base plate and a mount, the mount being arranged on the second base plate, the lifting mechanism being pivotally connected to the second base plate; the seat frame is provided with a second guide hole, and the first guide rod is arranged in the second guide hole in a sliding way; the spring is located on a side of the mount facing the top plate.

According to a preferred embodiment, an end of the first guide bar remote from the top plate is provided with a second limit structure.

According to a preferred embodiment, the top plate comprises a first base plate and a limiting plate which are connected with each other, and when the lifting base is in the storage posture, the reset piece acts on the limiting plate or the lifting mechanism so that the top plate has a movement trend away from the bottom plate.

According to a preferred embodiment, the top plate comprises a first base plate and a mounting plate connected to each other, the mounting plate being arranged at a side of the lifting mechanism remote from the drive unit.

According to a preferred embodiment, the lifting mechanism comprises two support structures comprising a first link plate and a second link plate pivotally connected to each other; the first link plate of one of the support structures is pivotally connected to the top plate, the second link plate is pivotally connected to the bottom plate, the second link plate of the other support structure is pivotally connected to the top plate, and the first link plate is pivotally connected to the bottom plate.

According to a preferred embodiment, the first and second link plates pivotally connected to the top plate are each in frictional abutment near an end of the top plate; and the ends of the first connecting plate and the second connecting plate which are pivotally connected to the bottom plate are in friction abutting connection with each other near the bottom plate.

According to a preferred embodiment, the driving unit is a telescopic member, and the telescopic member is disposed between two first connecting plates or two second connecting plates disposed opposite to each other of the lifting mechanism; or alternatively

The telescopic piece is arranged between the first connecting plate and the second connecting plate which are adjacently arranged on the lifting mechanism. .

A seat unit comprising a chassis structure, a mechanical stretching device and the lifting base; the two lifting bases are arranged on the chassis structure in a mirror image mode; the two lifting bases are linked; the mechanical stretching device is arranged on the top plate, and the bottom plate is connected to the chassis structure.

The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:

when the lifting base provided by the invention is switched from the storage posture to the extension posture, the top plate is enabled to act away from the bottom plate under the combined action of the reset piece and the driving unit, namely, the reset piece can realize the labor-saving effect of the driving unit in the process, thereby being beneficial to reducing the load of the driving unit and prolonging the service life of the driving unit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of an embodiment of the present invention in which two lifting bases in an extended posture are assembled to a chassis structure;

fig. 2 is a schematic perspective view of two lifting bases in a storage posture according to an embodiment of the present invention assembled to a chassis structure;

fig. 3 is a schematic front view of a lifting base in an extended posture according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a lifting base in an extended posture according to an embodiment of the present invention;

fig. 5 is a schematic front view of a lifting base in a storage posture according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a seat unit according to an embodiment of the present invention.

Icon: 100. a chassis structure; 200. lifting a base; 210. a first drive beam; 220. a second drive beam; 230. a driving unit; 240. a top plate; 241. a first substrate; 242. a mounting plate; 243. a limiting plate; 250. a lifting mechanism; 251. a support structure; 2511. a first connecting plate; 2512. a second connecting plate; 254. an extension plate; 260. a reset member; 261. a first guide bar; 262. an elastic member; 263. a first limit structure; 264. a second limit structure; 265. a linkage plate; 270. a bottom plate; 271. a second substrate; 2711. an opening; 272. a mounting; 300. a mechanical stretching device; x, a first direction; y, second direction; a. a first tooth; b. and a second tooth.

Detailed Description

For a better understanding and implementation, 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.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 to 6, a lifting base 200 includes a top plate 240, a bottom plate 270, a lifting mechanism 250, a driving unit 230 and a reset member 260, wherein, as shown in fig. 1 and 3, the top plate 240 and the bottom plate 270 are spaced apart, the lifting mechanism 250 is adjustably disposed between the top plate 240 and the bottom plate 270 and is pivotally connected to the top plate 240 and the bottom plate 270, respectively; the driving unit 230 includes a driving end connected to the top plate 240 or the elevating mechanism 250 to drive the top plate 240 away from or close to the bottom plate 270 to switch the elevating base 200 between the extended posture or the storage posture; when the elevating base 200 is in the storage posture, the reset member 260 acts on the top plate 240 or the elevating mechanism 250 so that the top plate 240 has a movement tendency away from the bottom plate 270.

The lifting base 200 provided in this embodiment cooperates with the lifting mechanism 250 through the driving unit 230 to adjust the relative distance between the top plate 240 and the bottom plate 270, thereby realizing the lifting function of the lifting base 200, and thus realizing the lifting or adjusting the spatial position height of the adjusted mechanism or device assembled on the top plate 240.

Specifically, as shown in fig. 3 and 5, the case where the elevating base 200 is applied to the longitudinal adjustment (the top plate 240 is longitudinally moved toward or away from the bottom plate 270) will be described as an example.

As shown in fig. 3, when the elevating base 200 is in the extended posture, the longitudinal distance between the top plate 240 and the bottom plate 270 is maximized, and at this time, the adjusted mechanism or device is adjusted to the highest position; as shown in fig. 5, when the elevating base 200 is in the storage posture, the longitudinal distance between the top plate 240 and the bottom plate 270 is minimized, and at this time, the adjustment mechanism or device is adjusted to the lowest position. In use, the regulated mechanism or device is mounted to the top plate 240. In this embodiment, the distance between the top plate 240 and the bottom plate 270 is the maximum distance between the side of the top plate 240 away from the bottom plate 270 and the side of the bottom plate 270 away from the top plate 240.

When the lifting base 200 is switched from the storage posture to the extending posture, the top plate 240 is moved away from the bottom plate 270 under the combined action of the reset member 260 and the driving unit 230, that is, the reset member 260 can achieve the labor-saving effect of the driving unit 230 in the process, which is beneficial to reducing the load of the driving unit 230 and prolonging the service life of the driving unit 230.

In order to improve the safety of the process of adjusting the elevating base 200 from the extended posture to the storage posture, further, when the elevating base 200 is switched from the extended posture to the storage posture and the elevating base 200 is moved to the storage posture, the reset member 260 acts on the top plate 240 or the elevating mechanism 250 to block the top plate 240 from approaching the bottom plate 270.

Specifically, the reset member 260 herein may act on the elevating base 200 for an initial period or a full period of time for switching from the storage posture to the extension posture. In the present embodiment, the reset member 260 preferably acts on the elevating base 200 during the initial period of switching from the storage posture to the extension posture. When the lifting base 200 is used, in the process of switching from the storage posture to the extension posture, the reset piece 260 does not provide a force for the top plate 240 in other time periods except the initial time period, so that the driving unit 230 in the initial time period of switching from the extension posture to the storage posture of the lifting base 200 is free from the resistance from the reset piece 260, and the lifting base 200 is beneficial to smoothly proceeding from the extension posture to the storage posture; meanwhile, when the lifting base 200 approaches to the storage posture, the top plate 240 is subjected to the resistance of the reset piece 260 until the lifting base 200 reaches to the storage posture, the top plate 240 is restored to have a movement trend away from the bottom plate 270 along the longitudinal direction, and in the process, the reset piece 260 provides a buffer effect for the lifting base 200, so that the posture stability of the mechanism or the device to be adjusted during the posture adjustment of the lifting base 200 is improved.

Of course, in other embodiments, the restoring member 260 may also act on the lifting base 200 during the entire period from the storage posture to the extended posture, that is, the restoring member 260 always provides the top plate 240 with a force away from the bottom plate 270 during the entire period from the storage posture to the extended posture of the lifting base 200.

In this embodiment, the restoring member 260 includes an elastic member 262, and the elastic member 262 is disposed between the top plate 240 and the bottom plate 270; the top plate 240 is away from the bottom plate 270 in a first direction X, and the top plate 240 is close to the bottom plate 270 in a second direction Y, the first direction X being opposite to the second direction Y; the elastic member 262 is disposed to extend along the first direction X; when the elevating base 200 is in the storage posture, the top plate 240 or the elevating mechanism 250 abuts against an end of the elastic member 262 away from the bottom plate 270 to compress the elastic member 262.

As shown in fig. 3 and 5, the first direction X here is a direction upward in the longitudinal direction, and the second direction Y is a direction downward in the longitudinal direction. The elastic member 262 is extended in the first direction X so that the elastic member 262 provides the driving force of the top plate 240 away from the bottom plate 270 and the damping force of the bottom plate 270.

As shown in fig. 3 to 5, in the present embodiment, preferably, the elastic member 262 is a spring (compression spring) whose axial direction is parallel to the first direction X.

In another embodiment, the elastic member 262 may be an elastic sheet, elastic silica gel, elastic rubber, or the like, and may be disposed on the bottom plate 270, and when the lifting base 200 is in the storage posture, the top plate 240 or the lifting mechanism 250 cooperates with the bottom plate 270 to compress the elastic member 262 to elastically deform.

In this embodiment, further, in order to improve structural stability of the spring during operation, as shown in fig. 3 to 5, the reset member 260 further includes a first guide rod 261, where the first guide rod 261 is slidably connected to the bottom plate 270; the axial direction of the first guide lever 261 is parallel to the first direction X; the spring (elastic member 262) is sleeved outside the first guide rod 261, a first limiting structure 263 is arranged at one end of the first guide rod 261, which is close to the top plate 240, and the spring is arranged between the bottom plate 270 and the first limiting structure 263. In this embodiment, the top plate 240 and the bottom plate 270 are combined to compress the elastic member 262. In use, when the lifting base 200 is switched from the extended posture to the storage posture, the top plate 240 approaches the bottom plate 270 along the second direction Y, and when the top plate 240 moves and abuts against the first guide rod 261, the first guide rod 261 receives a force from the top plate 240 along the second direction Y, so that the first guide rod 261 slides along the second direction Y relative to the bottom plate 270, and in the process, the first limiting structure 263 cooperates with the bottom plate 270 to compress the spring; when the lifting base 200 is switched from the storage posture to the extension posture, the top plate 240 is far away from the bottom plate 270 along the first direction X, the compressed spring resets along the first direction X and drives the first guide rod 261 to slide relative to the bottom plate 270 along the first direction X through the first limiting structure 263, so as to drive the cooperation driving unit 230 to drive the top plate 240 to be far away from the bottom plate 270 along the first direction X. The first guide bar 261 can provide support for the spring to prevent it from rolling substantially during compression and return.

To further improve the stability of the spring, optionally, three first guide rods 261 are provided, and the three first guide rods 261 are disposed in parallel and are slidably connected with the bottom plate 270. The reset member 260 further includes a linkage plate 265, three first guide rods 261 pass through the linkage plate 265, and the first limiting structure 263 is located on the upper side of the linkage plate 265, and the spring is located between the linkage plate 265 and the bottom plate 270. The linkage plate 265 can link the three first guide bars 261, thereby facilitating the three first guide bars 261 to be held in the horizontal direction, improving the structural stability of each first guide bar 261 when sliding relative to the bottom plate 270, and preventing the first guide bars 261 from being greatly tilted.

It should be noted that the number of the first guide bars 261 may be set as needed, and is not limited to three. Meanwhile, not all of the first guide bars 261 are provided with springs, and are also specifically rotatably assembled according to the damping force or driving force of the restoring member 260. For example, if a large damping force or driving force is required, the number of first guide bars 261 equipped with springs is large, whereas the number is small.

Optionally, an end of the first guide rod 261 remote from the top plate 240 is provided with a second limit structure 264. In this embodiment, as shown in fig. 3 and 5, the first limiting structure 263 and the second limiting structure 264 are used to limit the first guide rod 261 so as to prevent the first guide rod 261 from being separated from the bottom plate 270 and the top plate 240. The first limiting structure 263 and the second limiting structure 264 are snap springs. In other embodiments, the first and second stop structures 263 and 264 may also be nuts threadably coupled to the first guide rod 261.

In this embodiment, as shown in fig. 4, the bottom plate 270 includes a second base plate 271 and a stand 272, the stand 272 is disposed on the second base plate 271, and the lifting mechanism 250 is pivotally connected to the second base plate 271; the seat frame 272 is provided with a second guide hole (not shown in the figure), and the first guide rod 261 is slidably arranged in the second guide hole; the spring is on the side of the mount 272 facing the top plate 240. In this embodiment, the seat frame 272 has a shape of a Chinese character 'ji', and the notch of the seat frame 272 faces the same direction as the second direction Y. So arranged, the spring mounting position can be raised in the first direction X, facilitating the cooperation of the reset member 260 and the top plate 240.

Accordingly, the second base plate 271 is provided with an opening 2711 for avoiding the first guide bar 261.

Further, the top plate 240 includes a first base plate 241 and a limiting plate 243 connected to each other, and when the elevating base 200 is in the storage posture, the restoring member 260 acts on the limiting plate 243 to cause the top plate 240 to have a moving tendency away from the bottom plate 270 in the first direction.

Of course, in some embodiments, the reset member 260 may also act on the lift mechanism 250 to cause the top plate 240 to have a tendency to move longitudinally away from the bottom plate 270.

Specifically, as shown in fig. 3 to 5, the elevating mechanism 250 includes two support structures 251, the support structures 251 including a first link plate 2511 and a second link plate 2512 pivotally connected to each other; the first connection plate 2511 of one of the support structures 251 is pivotally connected to the first base plate 241, the second connection plate 2512 is pivotally connected to the second base plate 271, the second connection plate 2512 of the other support structure 251 is pivotally connected to the first base plate 241, and the first connection plate 2511 is pivotally connected to the second base plate 271. In this embodiment, the elastic member 262 may be a torsion spring that is mounted on the pivot shafts of the first and second connection plates 2511 and 2512 of the same support structure 251 and acts on the first and second connection plates 2511 and 2512, and when the elevating base 200 is in the storage posture, the torsion spring is compressed so that the support structure 251 has a tendency to lift the top plate 240. When the elastic member 262 is a torsion spring, the restoring member 260 acts on the elevating base 200 for a full period of time when the storage posture is switched to the extended posture.

In this embodiment, as shown in fig. 3 to 5, the driving unit 230 is a telescopic member, and the telescopic member is disposed between two first connection plates 2511 or two second connection plates 2512 disposed opposite to each other of the lifting mechanism 250; or the expansion member is disposed between the adjacently disposed first and second connection plates 2511 and 2512 of the elevating mechanism 250. Further, extension plates 254 are provided on both the first connection plate 2511 and the second connection plate 2512 connected to the expansion member, the extension plate 254 of the first connection plate 2511 is used for assembling the first driving beam 210, and the extension plate 254 of the second connection plate 2512 is used for assembling the second driving beam 220; the telescopic member is connected to the first connection plate 2511 through a first driving beam 210 and to the second connection plate 2512 through a second driving beam 220.

In this embodiment, preferably, the first connection plate 2511 and the second connection plate 2512 pivotally connected to the second base plate 271 are each provided with an extension plate 254, the extension plate 254 of the first connection plate 2511 is used for assembling the first driving beam 210, the extension plate 254 of the second connection plate 2512 is used for assembling the second driving beam 220, the driving unit 230 is a telescopic member, and accordingly, the driving end is a telescopic end. The telescoping end of the telescoping member is pivotally connected to either the first drive beam 210 or the top plate 240 and the fixed end of the telescoping member is pivotally connected to the second drive beam 220. The telescoping member may be a telescoping motor.

Further, in order to improve stability and safety of the elevating mechanism 250, the first and second link plates 2511 and 2512 pivotally connected to the top plate 240 are each frictionally abutted near an end of the top plate 240; and the ends of the first and second link plates 2511 and 2512 pivotally connected to the base plate 270, respectively, near the base plate 270 are in frictional abutment. Specifically, the first and second connection plates 2511 and 2512 are respectively provided with first and second teeth a and b, and the first and second connection plates 2511 and 2512 pivotally connected to the top plate 240 are simultaneously engaged with each other by the first and second teeth a and b, and accordingly, the first and second connection plates 2511 and 2512 pivotally connected to the bottom plate 270 are simultaneously engaged with each other by the first and second teeth a and b. The first tooth a and the second tooth b cooperate to ensure that the top plate 240 is not skewed when the lifting base 200 is adjusted in posture.

In other embodiments, the first connection plate 2511 and the second connection plate 2512 are correspondingly provided with a first friction surface (not shown in the figure) and a second friction surface (not shown in the figure), wherein the first friction surface and the second friction surface are two circular arc surfaces which are attached to each other, and in use, when the first connection plate 2511 and the second connection plate 2512 rotate around the top plate 240 and the bottom plate 270, the first friction surface and the second friction surface are always in line contact. In order to further improve the friction force between the first friction surface and the second friction surface, elastic rubber gaskets may be respectively disposed on the working surfaces of the first friction surface and the second friction surface, so that the assembled first friction surface and the assembled second friction surface are pressed and deformed, and surface contact is always maintained, so that the top plate 240 is effectively prevented from being skewed due to relative sliding between the first friction surface and the second friction surface, and the structural stability of the lifting base 200 in the posture switching process is increased.

It should be noted that, in other embodiments, when the elastic member 262 is a spring, the above-mentioned lifting mechanism 250 may also be applied. Specifically, a pressing plate (not shown) may be provided on the first connection plate 2511 and/or the second connection plate 2512 pivotally connected to the first substrate 241. The pressure plate here acts as a stop plate 243. Further, a cambered surface is provided on a side of the pressing plate facing the first guide rod 261, and the cambered surface is concavely provided along a direction away from the first guide rod 261. When in use, the first guide rod 261 can slide on the cambered surface along with the movement of the lifting mechanism 250 when the first guide rod 261 is abutted against the limiting plate 243, so that the first guide rod 261 can be prevented from being greatly inclined to affect the use.

The present embodiment also provides a seat unit, which includes a chassis structure 100, a mechanical stretching device 300, and the lifting base 200, where two lifting bases 200 are mirror-image arranged on the chassis structure 100; the two lifting bases 200 are linked; the mechanical stretcher 300 is disposed on the top plate 240 and the bottom plate 270 is connected to the chassis structure 100.

Specifically, as shown in fig. 1, 2 and 6, two lifting bases 200 share one driving unit 230, and share the same first driving beam 210 and second driving beam 220 to achieve linkage. The mechanical stretcher 300 here acts as the previously described adjusted mechanism or device. It should be noted that, the mechanical stretching device 300 may be any mechanical stretching device 300 that is currently used in a functional seat or a functional sofa, provided that the mechanical stretching device does not interfere with the space. The seat unit herein enables stable longitudinal posture adjustment. Preferably, the limiting plates 243 of the two elevating bases 200 are integrally connected. The structural stability of the seating unit is improved.

To facilitate assembly of the mechanical stretcher 300 with the lifting base 200, in this embodiment, the top plate 240 further includes a mounting plate 242 interconnected with the first base plate 241 or the limiting plate 243, and the mounting plate 242 is disposed at a side of the lifting mechanism 250 away from the driving unit 230, so that the mechanical stretcher 300 is mounted to the mounting plate 242. Specifically, as shown in fig. 5, the mounting plate 242 is located between the limiting plate 243 and the first base plate 241, and the three are connected by bolts.

The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims (12)

1. A lifting base (200), characterized by comprising:

a top plate (240);

a bottom plate (270);

a lifting mechanism (250) adjustably disposed between the top plate (240) and the bottom plate (270) and pivotally connected to the top plate (240) and the bottom plate (270), respectively;

-a drive unit (230) comprising a drive end connected to the top plate (240) or the lifting mechanism (250) to drive the top plate (240) away from or towards the bottom plate (270) to switch the lifting base (200) between an extended or stowed position; and

a reset member (260);

when the lifting base (200) is in the storage posture, the reset piece (260) acts on the top plate (240) or the lifting mechanism (250) so that the top plate (240) has a movement trend away from the bottom plate (270).

2. The lifting base (200) of claim 1, wherein the reset member (260) acts on the top plate (240) or the lifting mechanism (250) to block the top plate (240) from approaching the bottom plate (270) when the lifting base (200) is switched from the extended position to the stowed position and the lifting base (200) is moved toward the stowed position.

3. The lifting base (200) of claim 1, wherein the return member (260) comprises an elastic member (262), the elastic member (262) being disposed between the top plate (240) and the bottom plate (270);

-the top plate (240) is distant from the bottom plate (270) along a first direction (X), the top plate (240) being close to the bottom plate (270) along a second direction (Y), the first direction (X) being opposite to the second direction (Y);

-said elastic member (262) being arranged extending along said first direction (X);

when the lifting base (200) is in the storage posture, the top plate (240) or the lifting mechanism (250) is abutted to one end of the elastic member (262) away from the bottom plate (270) so as to compress the elastic member (262).

4. The lifting base (200) of claim 3, wherein the reset member (260) further comprises a first guide bar (261), the first guide bar (261) being slidably connected to the base plate (270);

the axial direction of the first guide rod (261) is parallel to the first direction (X);

the elastic piece (262) is a spring, the spring is sleeved outside the first guide rod (261), a first limit structure (263) is arranged at one end part of the first guide rod (261) close to the top plate (240), and the spring is located between the bottom plate (270) and the first limit structure (263).

5. The lifting base (200) of claim 4, wherein the floor (270) comprises a second base plate (271) and a mount (272), the mount (272) being disposed to the second base plate (271), the lifting mechanism (250) being pivotally connected to the second base plate (271);

the seat frame (272) is provided with a second guide hole, and the first guide rod (261) is arranged in the second guide hole in a sliding way;

the spring is on a side of the mount (272) facing the top plate (240).

6. The lifting base (200) according to claim 4, wherein an end of the first guide bar (261) remote from the top plate (240) is provided with a second limit structure (264).

7. The lifting base (200) of claim 1, wherein the top plate (240) comprises a first base plate (241) and a limiting plate (243) that are connected to each other, the reset member (260) acting on the limiting plate (243) or lifting mechanism (250) when the lifting base (200) is in a stowed position such that the top plate (240) has a tendency to move away from the bottom plate (270).

8. The lifting base according to claim 1, characterized in that the top plate (240) comprises a first base plate (241) and a mounting plate (242) connected to each other, the mounting plate (242) being arranged at a side of the lifting mechanism (250) remote from the drive unit (230).

9. The lifting base (200) according to any one of claims 1-8, wherein the lifting mechanism (250) comprises two support structures (251), the support structures (251) comprising a first link plate (2511) and a second link plate (2512) pivotally connected to each other;

the first link plate (2511) of one of the support structures (251) is pivotally connected to the top plate (240), the second link plate (2512) is pivotally connected to the bottom plate (270), the second link plate (2512) of the other support structure (251) is pivotally connected to the top plate (240), and the first link plate (2511) is pivotally connected to the bottom plate (270).

10. The lifting base (200) of claim 9, wherein the first link plate (2511) and the second link plate (2512) pivotally connected to the top plate (240) each frictionally abut near an end of the top plate (240); and the first link plate (2511) and the second link plate (2512) pivotally connected to the base plate (270) are each in frictional abutment near an end of the base plate (270).

11. The lifting base (200) according to claim 9, wherein the driving unit (230) is a telescopic member, which is arranged between two first connection plates (2511) or two second connection plates (2512) arranged opposite to each other of the lifting mechanism (250); or alternatively

The telescopic piece is arranged between the first connecting plate (2511) and the second connecting plate (2512) which are adjacently arranged on the lifting mechanism (250).

12. A seating unit comprising a chassis structure (100), a mechanical stretching device (300) and a lifting base (200) according to any one of claims 1-11;

the two lifting bases (200) are arranged on the chassis structure (100) in a mirror image mode;

the two lifting bases (200) are linked;

the mechanical stretcher (300) is arranged on the top plate (240), and the bottom plate (270) is connected to the chassis structure (100).