Anti-toppling chassis

Abstract

The utility model is suitable for the technical field of chair accessories, and provides an anti-tilting chassis. The anti-toppling chassis comprises a bottom plate, a plurality of supporting assemblies and at least one driving piece, the bottom plate is provided with at least one supporting piece, the supporting assemblies are all installed on the bottom plate, each supporting assembly comprises a shell and a lifting shaft installed in the shell, and the lifting shafts can stretch out and draw back relative to the shells. The driving part is fixed to the bottom plate and drives the lifting shafts to stretch out and draw back. Under the condition that the lifting shaft retracts into the shell, the supporting piece abuts against the supporting face. In the state that the lifting shafts extend out of the shell, at least all the lifting shafts in the supporting piece and the lifting shafts abut against the supporting face. Thus, under the condition that the lifting shaft is in the retraction state, only the supporting piece abuts against the ground, and the lifting shaft shares the height space of the shell to achieve storage. Under the condition that each lifting shaft extends out of the shell, the possibility of toppling can be reduced, the braking and / or posture fixing of the chair can be realized, and the functions are more diversified.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chair accessory technical field, especially, it relates to a anti -tilt bottom disc. BACKGROUND

[0002] In the chair such as wheelchair, seat, including the bottom disc for bearing. When the bottom disc is adjusted in angle and / or is moved in position by the change of use scene, the chair has the possibility of tipping over due to its own inclination or due to the ground slope, concave-convex and other factors. The bottom disc in the related art only has the function of reducing the possibility of chair tipping over, the function is relatively single, which is not conducive to user use. SUMMARY

[0003] Therefore, the utility model provides a anti -tilt bottom disc to solve how to improve the technical problem of the function diversity of bottom disc.

[0004] To solve the above problems, the technical scheme provided by the utility model embodiment is as follows:

[0005] The utility model embodiment provides a anti -tilt bottom disc, include: bottom plate is provided with at least one support piece, a plurality of support components are installed on the bottom plate, the support component includes the shell and installs the lifting shaft in the shell, the lifting shaft can be telescopic relative to the shell, at least one drive piece is fixed to the bottom plate, and each lifting shaft is driven to be telescopic, wherein, in the condition that the lifting shaft is retracted in the shell, the support piece abuts the support surface, in the state that the lifting shaft is stretched out of the shell, at least each lifting shaft abuts the support surface in the support piece and the lifting shaft.

[0006] In some embodiments, the bottom end of the shell is installed on the top end of the bottom plate, and the bottom end of the lifting shaft is telescopic through the bottom plate.

[0007] In some embodiments, each lifting shaft is driven by the drive piece to stretch out of the shell or retract into the shell simultaneously.

[0008] In some embodiments, the anti -tilt bottom disc includes one drive piece, one drive piece is connected with one support component, the anti -tilt bottom disc further includes connecting rod, the connecting rod is arranged between two support components, under the driving of the drive piece, each support component is driven by the connecting rod and moves synchronously, so that each lifting shaft is synchronously telescopic.

[0009] In some embodiments, the output shaft of the drive piece is connected with the shell and drives the shell to rotate, and the shell drives the lifting shaft to be telescopic, wherein, in the state that the lifting shaft is stretched out of the shell, the top end of the lifting shaft is in the shell and is spaced from the top end of the shell.

[0010] In some embodiments, the anti-tilt base comprises a plurality of driving members, and each support assembly is connected with one of the driving members.

[0011] In some embodiments, the support assembly further comprises a driving gear connected with an output shaft of the driving member, and a driven gear engaged with the driving gear and connected with the lifting shaft.

[0012] In some embodiments, the driving gear is arranged outside the housing and at a top end of the housing, the driving gear is spaced apart from the bottom plate, and the driving member is installed in a gap between the driving gear and the bottom plate.

[0013] In some embodiments, the housing is provided with a guide rail, the guide rail is arranged around the lifting shaft and at opposite ends of the guide rail in the extension direction of the lifting shaft, the support assembly further comprises a shaft sleeve and a locking pin, the shaft sleeve is rotatably connected with the housing and fixedly connected with the bottom plate, the shaft sleeve is connected with the lifting shaft, and the locking pin is fixedly connected with the lifting shaft and inserted into the guide rail at at least one end of the locking pin, so as to convert the rotation of the housing into the extension movement of the lifting shaft.

[0014] In some embodiments, the guide rail is provided with a limiting slot at each end, and the extension direction of the limiting slot is parallel to the extension direction of the support surface.

[0015] In some embodiments, the housing is provided with the shaft sleeve at each end, and in the state that the lifting shaft is retracted into the housing, the two shaft sleeves are connected with the lifting shaft.

[0016] In some embodiments, the support assembly further comprises an elastic pad arranged at a bottom end of the lifting shaft for flexible abutment with the support surface.

[0017] In some embodiments, the support member is arranged as a roller, and in the state that the bottom end of the lifting shaft abuts against the support surface, the roller is spaced apart from the support surface.

[0018] This utility model provides an anti-tilt chassis, including a base plate, multiple support components, and at least one drive component. The base plate has at least one support component, and the multiple support components are mounted on the base plate. Each support component includes a housing and a lifting shaft installed within the housing, the lifting shaft being extendable / retractable relative to the housing. The drive component is fixed to the base plate and drives each lifting shaft to extend / retract. When the lifting shaft is retracted into the housing, the support component abuts against a support surface; when the lifting shaft is extended out of the housing, at least each lifting shaft abuts against the support surface. Thus, when the lifting shaft is retracted, only the support component abuts against the ground, while the lifting shaft is separated from the ground. The lifting shaft shares the height space of the housing for storage, reducing the footprint of the anti-tilt chassis and reserving space for the user's feet. When each lifting shaft extends out of the housing and abuts against the ground, suspending the support component, the chair cannot be angled or moved due to the suspension, achieving braking and / or posture fixation of the chair, improving user reliability. When each lifting shaft extends beyond the outer casing and, together with the supporting components, contacts the ground, the increased contact points between the bottom of the anti-tilt chassis and the ground result in better stability and reduce the possibility of the chassis tipping over. The anti-tilt chassis offers greater versatility, adapting to various scenarios; its ingenious design enhances the user experience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first structure of the anti-tilt chassis provided in this embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of a second structure of the anti-tilt chassis provided in an embodiment of the present utility model;

[0021] Figure 3 The support component provided in the embodiments of this utility model is Figure 1 or Figure 2 The structural diagram shows the lifting shaft in the extended state.

[0022] Figure 4 The support component provided in the embodiments of this utility model is Figure 1 or Figure 2 The structural diagram shows the lifting shaft in a retracted state.

[0023] Figure 5 for Figure 3 A cross-sectional view along the AA direction;

[0024] Figure 6 This is a schematic diagram of a third structure of the anti-tilt chassis provided in an embodiment of the present utility model;

[0025] Figure 7 The support component provided in the embodiments of this utility model isFigure 6 structure diagram in the direction of B-B in FIG.

[0026] Figure 8 for Figure 7 sectional view in the direction of B-B in FIG.

[0027] Explanation of reference numerals:

[0028] 1, bottom plate; 2, support assembly; 21, outer shell; 211, guide rail; 2111, limiting groove; 22, lifting shaft; 23, driving gear; 24, driven gear; 25, shaft sleeve; 26, clamping pin; 27, elastic pad; 3, connecting rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clearly understood, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0030] In the specific examples, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the utility model are not described again.

[0031] In the following description, the terms "first", "second", and the like are only used to distinguish different objects, and do not mean that there is the same or relationship between the objects. It should be understood that the position description "upper", "lower", "outer", "inner" is the position in the normal use state, and the "left", "right" direction indicates the left and right direction shown in the specific corresponding schematic diagram, which can be the left and right direction in the normal use state or not.

[0032] It should be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "includes one" does not exclude the existence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0033] As Figure 1As shown, this embodiment of the present invention provides an anti-tilt chassis, which can be applied to electric or manual wheelchairs, household or office chairs, and other chairs, as well as to mobile carts capable of transporting goods. Of course, in some possible implementations, the anti-tilt chassis can also be applied to mobile bases capable of holding household appliances; for example, it can be applied to a mobile base adapted to an electric kettle. It should be noted that the application scenario of this embodiment does not limit the structure of the anti-tilt chassis.

[0034] For ease of explanation, this utility model embodiment will be explained using the application of an anti-tipping chassis in a chair as an example.

[0035] like Figure 1 As shown, the anti-tilt chassis includes a base plate 1, multiple support components 2, and at least one driving component (not shown). The number of support components 2 is two, three, four, or more than two, and the number of driving components can be one, two, three, four, or more than two. The base plate 1 provides installation space to support the chair. The base plate 1 is provided with a support component (not shown) for support on a support surface. The support component can be a fixed part such as a footrest or leg, or a freely movable part such as casters or pulleys. It should be noted that the support surface changes depending on the chair's usage scenario. For example, the support surface can be the ground surface, the interior of a building, or the floor paving layer. It can be understood that in the case of the anti-tilt chassis being used as a mobile base for household appliances, the anti-tilt chassis can also be the surface of an object such as a tabletop or cabinet surface.

[0036] like Figure 1 As shown, multiple support components 2 are mounted on the base plate 1. Each support component 2 includes a housing 21 and a lifting shaft 22. The lifting shaft 22 is installed inside the housing 21 and can extend and retract relative to the housing 21. The length of the lifting shaft 22 outside the outline of the housing 21 in the extended state is greater than the length outside the outline of the housing 21 in the retracted state. Specifically, the length of the lifting shaft 22 can be less than that of the housing 21 so that it can be fully retracted into the housing 21; or the length of the lifting shaft 22 can be greater than or equal to that of the housing 21 so that it can be partially retracted into the housing 21. In this way, at least part of the lifting shaft 22 in the retracted state is hidden inside the housing 21, while sharing the height space of the housing 21 without occupying additional space, thus achieving higher space utilization of the anti-rollover chassis.

[0037] like Figure 1 and Figure 2As shown, the driving member is also fixed to the bottom plate 1 and connected with at least one support assembly 2 to drive the plurality of lifting shafts 22 to retract and extend. Specifically, the driving member can be connected with the housing 21 in the support assembly 2 or the lifting shaft 22 in the support assembly 2. The driving member can be one to drive one lifting shaft 22 to retract and extend, and drive all the lifting shafts 22 to retract and extend through the transmission member (see Figure 1 ); or the driving member can be multiple and the same as the number of the support assemblies 2, and no transmission member is arranged between two support assemblies 2 (see Figure 2 ). Each support assembly 2 is connected with one driving member, and all the lifting shafts 22 can also be retracted and extended. However, no matter whether the driving member is one or multiple, as long as at least one driving member can provide a power source for the retraction and extension of all the lifting shafts 22.

[0038] As shown in Figure 1 , when the lifting shaft 22 is retracted into the housing 21, the support member abuts against the support surface. That is, when the lifting shaft 22 is in the retracted state, the bottom end of the lifting shaft 22 is spaced from the support surface, and the bottom end of the support member abuts against the support surface. In this way, the lifting shaft 22 in the retracted state does not occupy additional support area outside the support member, and space is reserved for the user's feet. When the lifting shaft 22 is extended out of the housing 21, at least the lifting shaft 22 abuts against the support surface, that is, the lifting shaft 22 can collectively lift the bottom plate 1 to make the support member suspended and spaced from the support surface. For example, when the support member is a roller and the anti-tip base is applied to an electric wheelchair, the lifting shaft 22 supports the roller to be suspended, so that the position of the electric wheelchair can be limited, and the electric wheelchair can be braked. The lifting shaft 22 can also abut against the support surface together with the support member, so that the lifting shaft 22 can assist the support member to support the bottom plate 1, increase the area of the anti-tip base abutting against the support surface, and improve the stability of the anti-tip base. For example, when the support member is a universal wheel and the anti-tip base is applied to a household seat, the household seat can be adjusted in the circumferential direction by the universal wheel. When the lifting shaft 22 is extended to abut against the support surface together with the universal wheel, the angle of the household seat is fixed and cannot be adjusted, and the practicality and reliability are high. Regardless of whether the support member is suspended or not, the lifting shaft 22 can abut against the support surface and collectively support the bottom plate 1 at multiple positions, thereby reducing the possibility of the anti-tip base falling.

[0039] For ease of explanation, the anti-tip base is applied to an electric wheelchair, and the support surface is the ground.

[0040] The utility model discloses an anti -tilt chassis, including bottom plate 1, a plurality of support components 2 and at least one drive piece, bottom plate 1 is provided with at least one support piece, a plurality of support components 2 all install on bottom plate 1, support component 2 includes shell 21 and installs the lifting shaft 22 in shell 21, and lifting shaft 22 can be relative to shell 21 telescopic. Drive piece is fixed to bottom plate 1, and each lifting shaft 22 is driven telescopic. In the case where lifting shaft 22 is retracted in shell 21, support piece abuts support surface, in the state where lifting shaft 22 is stretched out outside shell 21, at least each lifting shaft 22 abuts support surface among support piece and lifting shaft 22. Thus, because lifting shaft 22 is in the retracted state, only support piece abuts ground, and lifting shaft 22 is spaced from ground, and the height space of common shell 21 is realized to accomodate, can reduce the floor area of anti -tilt chassis and reserve space for user's both feet to use. When each lifting shaft 22 is stretched out outside shell 21, and the support piece is suspended in the case where the common abutment ground, because each support piece is suspended and can not adjust the angle of electric wheelchair, or drive electric wheelchair to move, realize the brake and / or attitude fixed of electric wheelchair, improve the use reliability of user. And when each lifting shaft 22 is stretched out outside shell 21, and the support piece is in the case where the common abutment ground, because the position of anti -tilt chassis on ground abutment increases, and the support stability is better, reduce the possibility of bottom plate 1 to dump. This setting makes anti -tilt chassis can reduce the possibility of electric wheelchair to dump, can realize the brake and / or attitude fixed of electric wheelchair, can also reduce the floor area of anti -tilt chassis and reserve space for user's both feet to use through retracting each lifting shaft 22, and the function is more diverse.

[0041] In some embodiments, as shown in Figure 3 and Figure 4 , the bottom end of the shell 21 is mounted to the top end of the bottom plate 1, and the bottom end of the lifting shaft 22 is arranged to extend and retract through the bottom plate 1. Thus, the "retracted state of the lifting shaft 22" refers to a state in which the lower end of the lifting shaft 22 moves towards the bottom plate 1 to a position at which the distance between the lower end of the lifting shaft 22 and the bottom plate 1 is minimized (see Figure 4 ). The "extended state of the lifting shaft 22" refers to a state in which the lower end of the lifting shaft 22 moves away from the bottom plate 1 to a position at which the distance between the lower end of the lifting shaft 22 and the bottom plate 1 is maximized, and the lower end of the lifting shaft 22 abuts the ground (see Figure 3 ). In this way, the extension and retraction direction of the lifting shaft 22 is perpendicular to the extension direction of the bottom plate 1. Thus, the lifting shaft 22 extends and retracts in a substantially vertical direction, which can minimize the floor area occupied by the lifting shaft 22. Moreover, since the path in the vertical direction is the shortest, the efficiency of the lifting shaft 22 extending to abut the ground is improved. In addition, compared to a mode in which the top end of the shell 21 is mounted to the bottom end of the bottom plate 1, the mode in which the bottom end of the shell 21 is mounted to the top end of the bottom plate 1 can allow the shell 21 to share the space on the top end of the bottom plate 1 for mounting other components, thereby reducing the overall height of the anti -tilt chassis.

[0042] It should be noted that the ground is generally a horizontal plane, so the direction perpendicular to the ground is the vertical direction. Of course, the ground may have uneven areas, meaning the horizontal plane doesn't necessarily have to be a plane forming a strict 0-degree angle with the horizontal. Considering practical errors, a horizontal plane can be understood as one where the angle with the horizontal is within 5 degrees. Since the horizontal plane doesn't need to be absolutely level, the corresponding vertical direction also doesn't need to be absolutely vertical; it only needs to be approximately horizontal and vertical.

[0043] In some embodiments, such as Figure 1 As shown, driven by the drive components, each lifting shaft 22 simultaneously extends outward from the outer casing 21 or simultaneously retracts inward from the outer casing 21. That is, each lifting shaft 22 starts simultaneously, retracting from the ground towards the base plate 1 to begin rising, or simultaneously extending from the position closest to the base plate 1 towards the ground to begin descending. The simultaneous start of each lifting shaft 22 ensures good motion coordination and prevents the chassis from tipping over due to large height differences caused by asynchronous lifting shafts 22, thus improving the stability of the anti-tipping chassis.

[0044] In some embodiments, such as Figure 1 As shown, the anti-roll chassis includes a drive unit connected to a support assembly 2. Specifically, the output shaft of the drive unit can be connected to a housing 21 to drive the housing 21 to rotate, or connected to a lifting shaft 22 to drive the lifting shaft 22 to extend or retract. The anti-roll chassis also includes a connecting rod 3, which is provided between each of the two support assemblies 2. Under the drive of the drive unit, each support assembly 2 is driven by the connecting rod 3 to move synchronously, so that each lifting shaft 22 extends or retracts synchronously.

[0045] In some possible implementations, the output shaft of the drive unit can be connected to the housing 21. For example, the drive unit can be a motor that drives the housing 21 to rotate. One drive unit drives one housing 21 to rotate, and the rotation of the housing 21 can be converted into the extension and retraction of the lifting shaft 22. After one housing 21 rotates, it drives all housings 21 to rotate through the connecting rod 3, thereby realizing the lifting and lowering of all lifting shafts 22. In this embodiment, the housing 21 in the support assembly 2, which is directly connected to one drive unit, is the driving member, the connecting rod 3 is the transmission member, and the lifting shaft 22 is the driven member.

[0046] In some possible embodiments, the output shaft of the driving member can also be connected with the lifting shaft 22, for example, the driving member can be a hydraulic cylinder and drive the lifting shaft 22 to extend and retract. One driving member drives one lifting shaft 22 to extend and retract; the extension and retraction movement of the lifting shaft 22 can be converted into the rotation of the housing 21, and after one housing 21 rotates, all housings 21 are driven to rotate through the connecting rod 3, thereby achieving the lifting of all lifting shafts 22. In this implementation, the lifting shaft 22 in the support assembly 2 directly connected with one driving member is the driving member, the connecting rod 3 is the transmission member, and the housing 21 is the driven member.

[0047] However, no matter how it is arranged, only one driving member can be used to achieve the synchronous extension and retraction of all lifting shafts 22, and only one control system is required, and the control logic is relatively simple, which is convenient to operate.

[0048] In some embodiments, as shown in Figure 5 the output shaft of the driving member is connected with the housing 21 and drives the housing 21 to rotate, and the housing 21 drives the lifting shaft 22 to extend and retract, that is, the housing 21 is the driving member, the lifting shaft 22 is the driven member, and the rotation of the housing 21 drives the lifting shaft 22 to extend and retract. In the state that the lifting shaft 22 extends out of the housing 21, the top end of the lifting shaft 22 is in the housing 21 and is spaced from the top end of the housing 21. That is, the length of the lifting shaft 22 is less than the sum of the length of the housing 21 and the distance from the housing 21 to the ground. In this way, the length of the lifting shaft 22 is relatively small, which is convenient to retract and store in the housing 21, so as to further reduce the total height of the support assembly 2, thereby making it possible to reduce the total height of the anti-rollover chassis.

[0049] In some embodiments, as shown in Figure 2 and Figure 6 the anti-rollover chassis includes a plurality of driving members, and each support assembly 2 is connected with one driving member, that is, each support assembly 2 can be independently driven. In this way, the height difference between the lifting heights of the lifting shafts 22 can be controlled, so as to adapt to the unevenness and slope of the ground, the flexibility of the anti-rollover chassis is higher, the applicable scenarios are more extensive, and the functional diversity of the anti-rollover chassis is improved.

[0050] In some embodiments, as shown in Figure 7 and Figure 8 the support assembly 2 further includes a driving gear 23 and a driven gear 24, the driving gear 23 is connected with the output shaft of the driving member, the driven gear 24 is engaged with the driving gear 23 and connected with the lifting shaft 22, that is, the lifting shaft 22 is threadedly connected with the driven gear 24. The support assembly 2 adopts gear transmission that engages with each other, and the transmission precision is higher, so as to more accurately control the lifting height of the lifting shaft 22, thereby further reducing the possibility of the anti-rollover chassis to overturn and improving the reliability of the electric wheelchair brake and / or posture fixation.

[0051] In some embodiments, as shown inFigure 6 and Figure 8 As shown, the drive gear 23 is disposed outside the housing 21 and located at the top of the housing 21. The drive gear 23 is spaced apart from the base plate 1, and the drive component is installed in the gap between the drive gear 23 and the base plate 1. This arrangement allows the drive component to be assembled using the gap between the housing 21 and the base plate 1. Compared to placing the drive component above the housing 21, this effectively reduces the height of the anti-rollover chassis, resulting in higher space utilization and greater space saving.

[0052] In some embodiments, such as Figures 3-5 As shown, the outer casing 21 has a guide rail 211, which surrounds the lifting shaft 22. The two ends of the guide rail 211 are in the extension / retraction direction of the lifting shaft 22, meaning there is a height difference between them. For ease of explanation, the two ends of the guide rail 211 will be referred to as the upper end and the lower end below. The support assembly 2 also includes a bushing 25 and a locking pin 26. The bushing 25 is rotatably connected to the outer casing 21 and engages with the lifting shaft 22. The bushing 25 is mounted on the base plate 1 (see reference). Figure 1 The locking pin 26 is fixedly connected to the lifting shaft 22, and at least one end of the locking pin 26 is inserted into the guide rail 211 to convert the rotation of the housing 21 into the extension and retraction of the lifting shaft 22. The lifting shaft 22, locked in the bushing 25, has its circumferential freedom restricted. The driving component drives the housing 21 to rotate relative to the bushing 25, causing the relative position of the locking pin 26 and the guide rail 211 to change. The locking pin 26 moves between the upper and lower ends of the guide rail 211, changing its height position. Driven by the locking pin 26, the lifting shaft 22 achieves lifting and lowering. Specifically, the upper end of the guide rail 211 corresponds to the highest point that the lifting shaft 22 can rise, and the lower end of the guide rail 211 corresponds to the lowest point that the lifting shaft 22 can descend. By controlling the length of the trajectory line of the guide rail 211, the highest point after the lifting shaft 22 rises and the lowest point after the lifting shaft 22 descends can be controlled, effectively reducing the possibility of insufficient control precision due to insufficient driving force of one driving component, and improving the motion precision of the lifting shaft 22.

[0053] It should be noted that this implementation scheme can be applied to embodiments where only one drive unit is shared by each support component 2 (see [reference]). Figure 1 This can also be applied to embodiments where each support component 2 is provided with a driving element (see reference). Figure 2 ).

[0054] In some embodiments, such as Figure 3 and Figure 4As shown, the two ends of the guide rail 211 are provided with limiting grooves 2111, the extending direction of the limiting grooves 2111 is parallel to the extending direction of the support surface, that is, the limiting grooves 2111 extend along the horizontal direction, that is, the extending direction of the limiting grooves 2111 is perpendicular to the lifting direction of the lifting shaft 22. In this way, the limiting grooves 2111 limit the pin 26, so that the pin 26 at the upper end of the guide rail 211 remains horizontal, and the pin 26 at the lower end of the guide rail 211 also remains horizontal, and then the lifting shaft 22 after lifting and lowering can also remain vertically extended, reducing the possibility of movement jam caused by the inclination of the lifting shaft 22, and also reducing the possibility of the anti-tilt chassis being tilted caused by the inclination of the lifting shaft 22.

[0055] In some embodiments, as shown in Figure 4 and Figure 5 , the two ends of the shell 21 are provided with shaft sleeves 25, and in the state that the lifting shaft 22 is retracted into the shell 21, the two shaft sleeves 25 are clamped with the lifting shaft 22. The two shaft sleeves 25 clamp the lifting shaft 22 together, which can better limit the freedom of the lifting shaft 22 in the circumferential direction, so that the lifting shaft 22 can only be lifted and lowered in the vertical direction, reducing the possibility of the lifting shaft 22 rotating relative to the shaft sleeve 25, and improving the stability of the lifting shaft 22 abutting the ground.

[0056] In some embodiments, as shown in Figure 5 , Figure 8 and , the support assembly 2 further comprises an elastic pad 27, which is arranged at the bottom end of the lifting shaft 22 for flexible abutment with the support surface. Specifically, the elastic pad 27 is made of a component with elastic modulus and softness, for example, the elastic pad 27 can be made of a rubber piece, so that the elastic pad 27 can be deformed to have a certain buffer space, which can be compatible with the scene where the ground has some concave and convex parts, and the softness of the elastic pad 27 can increase the friction with the ground, improving the reliability of the electric wheelchair in braking and / or posture fixing.

[0057] Figure 1 , Figure 2 and Figure 6 , the support is arranged as a roller, which can enable the electric wheelchair to rotate to achieve angle adjustment, and can enable the electric wheelchair to move to achieve position adjustment. In the state that the bottom end of the lifting shaft 22 abuts the support surface, the roller is spaced from the support surface. That is, the lifting shaft 22 can suspend the roller, and the roller cannot be driven because it does not contact the ground. Each lifting shaft 22 abuts the ground at multiple positions, which can achieve braking and / or posture fixing of the electric wheelchair, facilitating reliable use of the electric wheelchair by the user.

[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A roll-over protection chassis, characterized in that, The application relates to an anti-tilt base plate. The base plate is provided with at least one supporting part. A plurality of supporting assemblies are installed on the base plate, and each supporting assembly comprises a shell and a lifting shaft installed in the shell. At least one driving part is fixed to the base plate and drives the lifting shaft to extend or retract. When the lifting shaft retracts into the shell, the supporting part abuts against the supporting surface.

2. Anti-roll chassis according to claim 1, characterized in that The bottom end of the shell is installed on the top end of the base plate, and the bottom end of the lifting shaft extends and retracts through the base plate.

3. The anti-roll chassis of claim 1, wherein, Driven by the driving part, each lifting shaft extends out of the shell or retracts into the shell simultaneously.

4. Anti-roll chassis according to claim 3, characterized in that The anti-tilt base plate comprises one driving part, and one driving part is connected with one supporting assembly. The anti-tilt base plate further comprises a connecting rod, and the connecting rod is arranged between two supporting assemblies.

5. Anti-roll chassis according to claim 4, characterized in that Driven by the driving part, each supporting assembly is driven by the connecting rod to move synchronously, so that each lifting shaft extends or retracts synchronously. The output shaft of the driving part is connected with the shell and drives the shell to rotate.

6. The roll-over protection chassis of claim 3, wherein, When the lifting shaft extends out of the shell, the top end of the lifting shaft is spaced from the top end of the shell.

7. Anti-roll chassis according to claim 6, characterized in that The anti-tilt base plate comprises a plurality of driving parts, and each supporting assembly is connected with one driving part. The supporting assembly further comprises: A driving gear is connected with the output shaft of the driving part.

8. Anti-roll chassis according to claim 7, characterized in that A driven gear is engaged with the driving gear and connected with the lifting shaft.

9. Anti-roll chassis according to claim 4 or 6, characterized in that The driving gear is arranged outside the shell and located at the top end of the shell. The shell is provided with a guide rail, and the guide rail surrounds the lifting shaft and is arranged at the extending direction of the lifting shaft.

10. Anti-roll chassis according to claim 9, characterized in that The supporting assembly further comprises a shaft sleeve and a locking pin.

11. The anti-roll chassis of claim 9, wherein, The shaft sleeve is rotatably connected with the shell and fixedly connected with the base plate.

12. Anti-roll chassis according to any one of claims 1 to 8, characterized in that The shaft sleeve is connected with the lifting shaft, and the locking pin is fixedly connected with the lifting shaft. At least one end of the locking pin is inserted into the guide rail to convert the rotation of the shell into the extending or retracting movement of the lifting shaft.

13. Anti-roll chassis according to any one of claims 1 to 8, characterized in that Both ends of the guide rail are provided with limiting grooves, and the extending direction of the limiting grooves is parallel to the extending direction of the supporting surface. Both ends of the shell are provided with the shaft sleeve. In the state that the lifting shaft retracts into the shell, both shaft sleeves are connected with the lifting shaft. The supporting assembly further comprises: An elastic pad is arranged at the bottom end of the lifting shaft to abut against the supporting surface flexibly. The supporting part is arranged as a roller, and in the state that the bottom end of the lifting shaft abuts against the supporting surface, the roller is spaced from the supporting surface.

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