Base and seat

Abstract

The utility model provides a base and a seat, the base comprises: a seat frame having a guide portion; the first connecting rod mechanism is movably arranged on the seat frame; the driving part is arranged on the seat frame and is in driving connection with the first connecting rod mechanism; the roller is connected with the first connecting rod mechanism and is in guide fit with the guide part; wherein the roller is provided with an ascending position and a descending position which are arranged relative to the seat frame, and the driving piece drives the roller to move up and down between the ascending position and the descending position along the guide part through the first connecting rod mechanism. According to the technical scheme provided by the invention, the problem that the stability of the seat is affected due to the fact that the rolling wheel ascends and descends in a swinging manner in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric furniture technical field, specifically, a base and seat chair. BACKGROUND

[0002] With the aggravation of social aging, the life needs and health problems of the elderly are increasingly concerned. As an important tool for assisting the elderly in daily life, the design and function of the old chair are constantly developing and improving.

[0003] In the related art, the design of the old chair pays more and more attention to functionality and safety, especially the application of the roller lifting technology. This technology not only improves the flexibility and convenience of the old chair, but also enhances its applicability in different scenarios. Among them, the old chair is provided with a roller at the bottom, and the roller is lifted by a lifting mechanism. Specifically, the roller rises and falls in a swinging manner relative to the seat frame, and of course the rollers of other types of seats can also be lifted in a similar manner.

[0004] However, this swinging manner may affect the stability of the seat during the lifting and lowering process, especially when the lifting height is large, the swinging amplitude will also increase accordingly, which may cause inconvenience or safety hazards. SUMMARY

[0005] The utility model provides a base and seat chair to solve the problem that the roller in the related art is lifted and lowered by swinging, which affects the stability of the seat.

[0006] According to one aspect of the utility model, a base is provided, which comprises: a seat frame having a guide portion; a first linkage mechanism movably arranged on the seat frame; a driving member arranged on the seat frame, the driving member being drivingly connected with the first linkage mechanism; and a roller connected with the first linkage mechanism and in guiding cooperation with the guide portion. The roller has an upper position and a lower position relative to the seat frame, and the driving member drives the roller to move up and down along the guide portion between the upper position and the lower position through the first linkage mechanism.

[0007] Further, the first linkage mechanism comprises a lifting linkage and a supporting linkage, the upper end of the lifting linkage is hingedly connected with the seat frame, the lower end of the lifting linkage is hingedly connected with the upper end of the supporting linkage, and the lower end of the supporting linkage is hingedly connected with the roller. The driving member can be drivingly connected with the lower end of the lifting linkage and / or the upper end of the supporting linkage.

[0008] Further, when the roller is located at the lower position, the connecting line direction of the lifting linkage and the supporting linkage is parallel to the guiding direction of the guide portion.

[0009] Further, the first linkage mechanism further comprises a driving linkage rod, the driving member is drivingly connected with a first end of the driving linkage rod, and a second end of the driving linkage rod is drivingly connectable with the lower end of the lifting linkage rod and / or the upper end of the supporting linkage rod.

[0010] Further, an included angle between the driving linkage rod and the lifting linkage rod is obtuse when the roller is in the raised position; and / or, an included angle between the driving linkage rod and the supporting linkage rod is obtuse when the roller is in the raised position.

[0011] Further, the first linkage mechanism further comprises a driving linkage rod, the driving member is drivingly connected with a first end of the driving linkage rod, and a second end of the driving linkage rod is drivingly connectable with the lower end of the lifting linkage rod and / or the upper end of the supporting linkage rod.

[0012] Further, the driving member comprises a pressing rod extending along a width direction of the seat frame, the seat frame is provided with the first linkage mechanism and the roller on both sides in the width direction, and both ends of the pressing rod are respectively arranged in the first ends of the two driving rods; and / or, when the roller is switched between the raised position and the lowered position, an oscillation angle of the driving rod is less than 90°.

[0013] Further, when the roller is switched from the lowered position to the raised position, a lifting height of the roller is between 10mm and 40mm.

[0014] Further, the seat frame is provided with a support, the guide part is arranged on the support, and the first linkage mechanism is movably arranged on the support.

[0015] Further, the support is in a U-shaped structure, both opposite side walls of the support are provided with the first linkage mechanism connected with the same roller; and / or, the guide part is a guide groove, the roller is connected with the first linkage mechanism through a pin shaft, and the pin shaft is arranged in the guide groove.

[0016] Further, the roller comprises a first wheel body and a second wheel body arranged in a length direction of the seat frame in a spaced manner, and the driving member can drive the first wheel body and the second wheel body to synchronously lift and lower; and / or, the driving member drives the first wheel body to lift and lower through the first linkage mechanism, the base further comprises a second linkage mechanism, the driving member drives the second wheel body to lift and lower through the second linkage mechanism, and the structure of the first linkage mechanism is different from that of the second linkage mechanism.

[0017] According to another aspect of the present application, a seat is provided, the seat comprises a base, and the base is the above-mentioned base.

[0018] The technical scheme of the utility model discloses, the base includes seat frame, first connecting rod mechanism, driving part and gyro wheel. Driving part drives gyro wheel to move between the position of rising and the position of falling through first connecting rod mechanism, because seat frame has guide part, gyro wheel is connected with first connecting rod mechanism and guides cooperation with guide part, make gyro wheel move up and down and realize lifting. That is to say, utilize the movement characteristic of connecting rod mechanism, through the drive of driving part, make gyro wheel can realize up and down movement under the constraint of guide part, thereby realize the lifting and the falling of base. When needing to move, base can quickly lift, and it is convenient to push under various ground conditions, when using, base can be stably placed, increase the stability of seat. And the above structure makes gyro wheel realize lifting through the mode of up and down movement, compared with gyro wheel in related art relative to seat frame with swing mode rising and falling, can improve the stability of seat during rising and falling. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. In the drawings:

[0020] Figure 1 A structure schematic view of the base provided by the embodiment of the utility model is shown in the figure;

[0021] Figure 2 A partial enlarged view of the first wheel body of the base provided by the embodiment of the utility model is shown in the figure;

[0022] Figure 3 Another partial enlarged view of the first wheel body of the base provided by the embodiment of the utility model is shown in the figure;

[0023] Figure 4 A schematic view of the working state of the base provided by the embodiment of the utility model is shown in the figure;

[0024] Figure 5 Another partial enlarged view of the first wheel body of the base provided by the embodiment of the utility model is shown in the figure;

[0025] Figure 6 A partial enlarged view of the second wheel body of the base provided by the embodiment of the utility model is shown in the figure.

[0026] Among them, the above-mentioned drawing includes the following figure mark:

[0027] 10, seat frame; 11, guide part; 111, guide groove; 12, support;

[0028] 20, first connecting rod mechanism; 21, lifting linkage connecting rod; 22, support connecting rod; 23, driving linkage connecting rod; 24, driving connecting rod;

[0029] 30, drive member; 31, pressing rod;

[0030] 40, roller; 41, first wheel body; 42, second wheel body; 43, pin shaft;

[0031] 50, second connecting rod mechanism; 51, first rod body; 52, second rod body; 53, third rod body. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0033] As shown in the drawings, Figures 1 to 6 The embodiment of the present application provides a base, which comprises a seat frame 10, a first connecting rod mechanism 20, a drive member 30 and a roller 40. The seat frame 10 has a guide part 11, the first connecting rod mechanism 20 is movably arranged on the seat frame 10, the drive member 30 is arranged on the seat frame 10, and the drive member 30 is drivingly connected with the first connecting rod mechanism 20. The roller 40 is connected with the first connecting rod mechanism 20 and guidingly matched with the guide part 11. Wherein, the roller 40 has a rising position and a falling position arranged relative to the seat frame 10, and the drive member 30 drives the roller 40 to move up and down along the guide part 11 between the rising position and the falling position through the first connecting rod mechanism 20.

[0034] The base provided by the embodiment is used, the drive member 30 drives the roller 40 to move between the rising position and the falling position through the first connecting rod mechanism 20, because the seat frame 10 has the guide part 11, the roller 40 is connected with the first connecting rod mechanism 20 and guidingly matched with the guide part 11, so that the roller 40 moves in the up-down direction and realizes lifting and falling. That is to say, by using the motion characteristics of the connecting rod mechanism, the roller 40 can move up and down under the constraint of the guide part 11 through the driving of the drive member 30, so as to realize the lifting and falling of the base. When the seat needs to be moved, the base can be quickly lifted, which is convenient for pushing under various ground conditions; when used, the base can be stably placed, which increases the stability of the seat. Moreover, the above structure makes the roller 40 realize lifting and falling through the up-down movement, compared with the roller in the related art which rises and falls in a swinging manner relative to the seat frame, the stability of the seat during lifting and falling can be improved.

[0035] Here, "up and down movement" refers to movement along the vertical direction or at a certain angle to the vertical direction, so as to realize the vertical up and down movement and the tilting up and down movement of the roller 40. In this embodiment, the roller 40 moves vertically up and down.

[0036] It should be noted that the guide part 11 can be a guide groove or a guide rail, as long as it can move along the upper and lower guide rollers 40.

[0037] like Figures 1 to 3 As shown, the first linkage mechanism 20 includes a lifting linkage 21 and a supporting linkage 22. The upper end of the lifting linkage 21 is hinged to the seat frame 10, and the lower end of the lifting linkage 21 is hinged to the upper end of the supporting linkage 22. The lower end of the supporting linkage 22 is hinged to the roller 40. The driving member 30 can be driven to connect with the lower end of the lifting linkage 21 and / or the upper end of the supporting linkage 22. Through the hinged structure of the lifting linkage 21 and the supporting linkage 22, the driving force of the driving member 30 can be effectively transmitted to the roller 40, realizing the lifting and lowering of the roller 40. The lifting and lowering process of the roller 40 is smoother, reducing the load on the driving member 30 and improving the driving efficiency.

[0038] In this embodiment, the hinge point A between the lower end of the lifting linkage 21 and the upper end of the support linkage 22 is the driving point 30. The driving member 30 is driven to the hinge point A to simultaneously drive the lifting linkage 21 and the support linkage 22 to move, thereby further improving the lifting stability.

[0039] In this embodiment, when the roller 40 is in the lowered position, the line connecting the lifting linkage 21 and the support linkage 22 is parallel to the guiding direction of the guide portion 11. Utilizing the self-locking characteristic of the linkage mechanism, when the roller 40 descends to contact the ground, the line connecting the lifting linkage 21 and the support linkage 22 remains parallel to the guiding direction of the guide portion 11, forming a stable support structure and preventing the roller 40 from accidentally lifting. This structure makes the seat more stable during use, increasing the user's sense of security.

[0040] Specifically, in this embodiment, when the roller 40 is in the lowered position, both the lifting linkage 21 and the support linkage 22 are arranged in the vertical direction.

[0041] like Figures 1 to 3As shown, the first linkage mechanism 20 further comprises a driving linkage rod 23, the driving member 30 is drivingly connected with a first end of the driving linkage rod 23, and a second end of the driving linkage rod 23 is drivingly connected with the lower end of the lifting linkage rod 21 and / or the upper end of the supporting linkage rod 22. By arranging the driving linkage rod 23, the driving force of the driving member 30 can be more evenly distributed to the lifting linkage rod 21 and the supporting linkage rod 22, thereby improving the stability of the lifting process of the roller 40. The lifting of the roller 40 is smoother, the wear of the linkage mechanism is reduced, and the service life is prolonged.

[0042] In the embodiment, the second end of the driving linkage rod 23 is drivingly connected with the hinge point A to simultaneously drive the lifting linkage rod 21 and the supporting linkage rod 22 to move.

[0043] Specifically, when the roller 40 is located at the raised position, the included angle between the driving linkage rod 23 and the lifting linkage rod 21 is obtuse. When the roller 40 is located at the raised position, the included angle between the driving linkage rod 23 and the supporting linkage rod 22 is obtuse. By reasonably arranging the included angles between the linkage rods, the geometric principle is utilized to make the linkage mechanism maintain good force transmission efficiency during the lifting of the roller 40, and at the same time, a self-locking structure is formed when the roller 40 is lowered to prevent accidental lowering. Therefore, by adopting the above structure, the lifting process of the roller 40 is more labor-saving, the operation is more convenient, and the roller 40 can be kept stable in the raised state.

[0044] As shown in the figure, Figures 1 to 3 As shown, the first linkage mechanism 20 further comprises a driving linkage rod 23, the driving member 30 is drivingly connected with a first end of the driving linkage rod 23, and a second end of the driving linkage rod 23 is drivingly connected with the lower end of the lifting linkage rod 21 and / or the upper end of the supporting linkage rod 22. By arranging the driving linkage rod 23, the driving force of the driving member 30 can be more evenly distributed to the lifting linkage rod 21 and the supporting linkage rod 22, thereby improving the stability of the lifting process of the roller 40. The lifting of the roller 40 is smoother, the wear of the linkage mechanism is reduced, and the service life is prolonged.

[0045] It should be noted that, in the embodiment, the lever action of the linkage rod refers to the action of a force-saving lever.

[0046] As shown in the figure, Figures 1 to 3As shown, the driving component 30 includes a pressure rod 31, which extends along the width direction of the seat frame 10. A first linkage mechanism 20 and rollers 40 are provided on both sides of the seat frame 10 in the width direction. The two ends of the pressure rod 31 pass through the first ends of two driving linkages 24, respectively. By utilizing the lateral arrangement of the pressure rod 31, the driving component 30 can simultaneously drive the rollers 40 on both sides to rise and fall, achieving synchronous lifting and lowering of the rollers 40, thus improving the stability and safety of the seat during movement. The seat is more stable during movement, reducing the risk of seat tilting and enhancing the user experience.

[0047] Furthermore, when the roller 40 switches between the rising and falling positions, the swing angle of the drive link 24 is less than 90°, and the moving space occupied by the drive link 24 is small.

[0048] The swing angle of the drive link 24 can be 40°, 50°, 60°, 70°, 80°, 90°, or other values ​​less than 90°. In this embodiment, the swing angle of the drive link 24 is 67.5°.

[0049] like Figure 4 As shown in the figure, the red line is the schematic line of the linkage when the roller 40 is in the rising position, and the green line is the schematic line of the linkage when the roller 40 is in the falling position.

[0050] Specifically, the working method is to step on the pressure lever 31 to lower the roller 40, and push the pressure lever 31 up to raise the roller 40.

[0051] It should be noted that when the roller 40 switches from the lowered position to the raised position, the lifting height of the roller 40 is between 10mm and 40mm. The wide lifting range of the roller 40 makes it more practical. Specifically, by precisely controlling the lifting height of the roller 40, the seat can adapt to different ground obstacles, such as thresholds and uneven ground, when raised. The seat can move more flexibly when raised, improving its practicality.

[0052] When the roller 40 switches from the lowered position to the raised position, the lifting height of the roller 40 can be 10mm, 20mm, 30mm, 40mm, or other values ​​between 10mm and 40mm. In this embodiment, the lifting height of the roller 40 is 22mm.

[0053] like Figures 1 to 3 As shown, a bracket 12 is provided on the seat frame 10, a guide part 11 is provided on the bracket 12, and a first linkage mechanism 20 is movably provided on the bracket 12. The bracket 12 provides stable support and guidance for the first linkage mechanism 20, ensuring the smoothness and accuracy of the lifting process of the roller 40.

[0054] like Figure 5As shown, in the embodiment, the bracket 12 is in a U-shaped structure, and both opposite side walls of the bracket 12 are provided with the first linkage mechanism 20 connected with the same roller 40. The first linkage mechanisms 20 on both sides of the bracket 12 are used to drive the roller 40 at the same time, so as to provide more stable support for the roller 40.

[0055] Further, the guide part 11 is a guide groove 111, and the roller 40 is connected with the first linkage mechanism 20 through a pin shaft 43, and the pin shaft 43 is arranged in the guide groove 111. The cooperation of the pin shaft 43 and the guide groove 111 ensures the guidance of the roller 40 during the lifting process, and prevents the deviation of the roller 40 during the movement. The seat is more stable during the movement, and the lifting process of the roller 40 is more accurate.

[0056] Among them, the guide groove 111 extends along the vertical direction or a direction with a certain angle with the vertical direction to realize the guidance of the roller 40. In the embodiment, the guide groove 111 extends along the vertical direction.

[0057] In addition, the cooperation of the pin shaft 43 and the guide groove 111 has the advantages of simple structure and low cost. The pin shaft 43 can realize the assembly and fixation of the roller 40, and also can realize the movement guidance of the roller 40, that is, the pin shaft 43 has two functions.

[0058] As shown, Figure 1 The roller 40 includes the first wheel body 41 and the second wheel body 42 arranged at intervals along the length direction of the seat frame 10, and the driving member 30 can drive the first wheel body 41 and the second wheel body 42 to lift synchronously, so as to improve the stability of the seat lifting.

[0059] In the embodiment, the driving member 30 drives the first wheel body 41 to lift through the first linkage mechanism 20, and the base further includes a second linkage mechanism 50, the driving member 30 drives the second wheel body 42 to lift through the second linkage mechanism 50, and the structure of the first linkage mechanism 20 is different from that of the second linkage mechanism 50. Through the arrangement of the first linkage mechanism 20 and the second linkage mechanism 50, the synchronous lifting of the first wheel body 41 and the second wheel body 42 is realized, the stability and safety of the seat during the movement are improved, the risk of the seat tilting is reduced, and the user's use experience is improved.

[0060] Further, one driving member 30 can cooperate with two linkage mechanisms (the first linkage mechanism 20 and the second linkage mechanism 50) at the same time to realize the synchronous lifting of the first wheel body and the second wheel body, so as to reduce the driving cost.

[0061] Specifically, as shown, Figure 6As shown, the second linkage mechanism 50 comprises a first rod body 51, a second rod body 52 and a third rod body 53, and works in such a way that the foot-pressing rod 31 is pressed, the second rod body 52 moves forward and drives the first rod body 51 to rotate forward, the first rod body 51 drives the third rod body 53 to push forward, and the third rod body 53 drives the connected parallelogram structure to rotate, thereby making the second wheel body 42 descend.

[0062] In addition, the second linkage mechanism 50 can also realize self-locking function by the first rod body 51 and the third rod body 53 rotating point included angle close to 180°.

[0063] Specifically, the second linkage mechanism 50 further comprises a transmission swing rod, the first end of the transmission swing rod is hingedly connected with the seat frame 10, the middle part of the transmission swing rod is hingedly connected with the end of the second rod body 52 away from the first rod body 51, the driving link 24 is provided with a sliding groove, and the second end of the transmission swing rod is slidably arranged in the sliding groove along the extension direction of the sliding groove. When the foot-pressing rod 31 drives the driving link 24 to rotate, the driving link 24 drives the second rod body 52 to move forward and backward through the transmission swing rod, the second rod body 52 drives the first rod body 51 and the third rod body 53 to move, thereby making the second wheel body 42 ascend and descend.

[0064] In the embodiment, the roller 40 is a 4-inch roller.

[0065] The utility model discloses still one embodiment provides a kind of seat, seat includes pedestal, and the pedestal is the pedestal provided above. Therefore, the stability in this seat can also be improved during lifting and lowering.

[0066] Among them, seat includes but is not limited to old person chair, sofa chair.

[0067] The device provided by the embodiment has the following beneficial effects:

[0068] (1) by the linkage mechanism, the lifting and lowering of the seat bottom roller are realized, not only the moving convenience of the seat is improved, but also the bottom can be off the ground when the roller is lowered, which is convenient for use in complex ground environment such as thick carpet, and significantly enhances the application range and user experience of the seat.

[0069] (2) the self-locking and resetting realized by the linkage relationship ensure the stability and safety of the roller in the lifting state, and avoid the risk of accidental falling of the roller during use.

[0070] (3) by reasonably setting the lifting height range of the roller 40, the seat can adapt to various ground obstacles in the lifting state, and the adaptability and flexibility of the seat are improved.

[0071] (4) The reasonable setting of the angle between the connecting rods makes the driving roller lifting process more labor-saving, reduces the energy consumption and wear of the driving part, prolongs the service life of the seat, and also simplifies the operation process and improves the use convenience.

[0072] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0073] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0074] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of contrary statements, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0075] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0076] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any meaning of importance, but are used solely to differentiate one element from another, and are used in the context of this application without implying any specific order, or order of precedence. Accordingly, a first element that follows an operation can be performed before, after, or at the same time as a second element that precedes the operation.

[0077] The preferred embodiments of the present application have been described above with the purpose of enabling not only the best modes of practicing the application known to the inventors at this time, but also of enabling others skilled in the art to utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, the above description is intended to be illustrative, but not restrictive, of the scope of the present application. All patents and patent applications mentioned herein are incorporated by reference in their entirety.

Claims

1. A base, characterized in that, The base comprises: a seat frame (10) having a guide portion (11); a first linkage mechanism (20) movably arranged on the seat frame (10); a driving member (30) arranged on the seat frame (10), the driving member (30) being drivingly connected with the first linkage mechanism (20); a roller (40) connected with the first linkage mechanism (20) and guidingly matched with the guide portion (11); wherein the roller (40) has a raised position and a lowered position relative to the seat frame (10), and the driving member (30) drives the roller (40) to move up and down along the guide portion (11) between the raised position and the lowered position through the first linkage mechanism (20).

2. The base of claim 1, wherein, The first linkage mechanism (20) comprises a lifting linkage (21) and a supporting linkage (22), an upper end of the lifting linkage (21) is hingedly connected with the seat frame (10), a lower end of the lifting linkage (21) is hingedly connected with an upper end of the supporting linkage (22), and a lower end of the supporting linkage (22) is hingedly connected with the roller (40), and the driving member (30) is drivingly connected with the lower end of the lifting linkage (21) and / or the upper end of the supporting linkage (22).

3. The base of claim 2, wherein, When the roller (40) is located at the lowered position, a line direction of the lifting linkage (21) and the supporting linkage (22) is parallel to a guiding direction of the guide portion (11).

4. The base of claim 2, wherein, The first linkage mechanism (20) further comprises a driving linkage (23), the driving member (30) is drivingly connected with a first end of the driving linkage (23), and a second end of the driving linkage (23) is drivingly connected with the lower end of the lifting linkage (21) and / or the upper end of the supporting linkage (22).

5. The base according to claim 4, wherein when the roller (40) is located at the raised position, an included angle between the driving linkage (23) and the lifting linkage (21) is obtuse; and / or when the roller (40) is located at the raised position, an included angle between the driving linkage (23) and the supporting linkage (22) is obtuse.

6. The base of claim 4, wherein, The first linkage mechanism (20) further comprises a driving linkage (24), a middle portion of the driving linkage (24) is hingedly connected with the seat frame (10), the driving member (30) is drivingly connected with a first end of the driving linkage (24), and a second end of the driving linkage (24) is drivingly connected with the driving linkage (23).

7. The base according to claim 6, wherein the driving member (30) comprises a pressing rod (31) extending along a width direction of the seat frame (10), both sides of the width direction of the seat frame (10) are provided with the first linkage mechanism (20) and the roller (40), and both ends of the pressing rod (31) are respectively arranged in the first ends of the two driving linkages (24); and / or When the roller (40) is switched between the raised position and the lowered position, the swing angle of the driving link (24) is less than 90°.

8. The base of any one of claims 1 to 7, wherein, When the roller (40) is switched from the lowered position to the raised position, the lifting height of the roller (40) is between 10mm and 40mm.

9. The base of any one of claims 1 to 7, wherein, The seat frame (10) is provided with a support (12), the guide part (11) is arranged on the support (12), and the first link mechanism (20) is movably arranged on the support (12).

10. The base according to claim 9, characterized in that, The support (12) is in a U-shaped structure, and the two opposite side walls of the support (12) are both provided with the first link mechanism (20) connected with the same roller (40); and / or, The guide part (11) is a guide groove (111), the roller (40) is connected with the first link mechanism (20) through a pin shaft (43), and the pin shaft (43) penetrates the guide groove (111).

11. The base according to any one of claims 1 to 7, characterized in that, The roller (40) comprises a first wheel body (41) and a second wheel body (42) arranged at intervals along the length direction of the seat frame (10), and the driving member (30) can drive the first wheel body (41) and the second wheel body (42) to synchronously lift and lower; and / or, The driving member (30) drives the first wheel body (41) to lift and lower through the first link mechanism (20), the base further comprises a second link mechanism (50), the driving member (30) drives the second wheel body (42) to lift and lower through the second link mechanism (50), and the structure of the first link mechanism (20) is different from that of the second link mechanism (50).

12. A seat, characterized by The seat comprises a base, and the base is the base according to any one of claims 1 to 11.

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