Scooter

Abstract

The utility model relates to a scooter. The scooter comprises a front foot unit which comprises a front side scooter body and a front wheel, and the front wheel is arranged on the front side scooter body; the rear foot unit comprises a rear side vehicle body and rear wheels, and the rear wheels are arranged on the rear side vehicle body; the seat unit is pivoted with the front side vehicle body and / or the rear side vehicle body; the chair back unit comprises a chair back, and the chair back is pivoted with the seat unit; the sliding block is arranged on the rear side vehicle body in a sliding mode, and the sliding block is pivoted to the seat unit and / or the chair back unit; when the sliding block slides, the front side vehicle body and the rear side vehicle body are far away from each other or close to each other, and meanwhile the seat unit rotates. The scooter is convenient to fold or unfold, and user experience can be improved.

Description

Technical Field

[0001] The present application relates to the field of mobile equipment, and in particular to a mobility scooter. Background Art

[0002] The electric scooter uses a motor to drive the rollers at the bottom of the scooter to rotate. The user sits on the scooter and the scooter can carry the user to move. Some existing scooters have a folding function, and the scooter can be folded and stored when not in use. However, the overall weight of the scooter is large, and the complicated operation of folding or unfolding is time-consuming and laborious. Utility Model Content

[0003] Based on the above problems, the present application provides a mobility scooter that is easy to fold or unfold.

[0004] According to one aspect of the present application, a mobility scooter is provided, comprising:

[0005] A front foot unit, comprising a front vehicle body and a front wheel, wherein the front wheel is arranged on the front vehicle body;

[0006] A rear leg unit, comprising a rear vehicle body and a rear wheel, wherein the rear wheel is arranged on the rear vehicle body;

[0007] A seat unit, pivotally connected to the front vehicle body and / or the rear vehicle body;

[0008] A chair back unit, comprising a chair back, the chair back being pivotally connected to the seat unit;

[0009] A slider, slidably disposed on the rear vehicle body, the slider being pivotally connected to the seat unit and / or the seat back unit;

[0010] When the sliding block slides, the front vehicle body and the rear vehicle body move away from or closer to each other, and at the same time, the seat unit rotates.

[0011] According to some embodiments of the present application, the seat unit is provided with a limiting portion, and the limiting portion is used to limit the rotation angle of the seat back relative to the seat unit within a preset range.

[0012] According to some embodiments of the present application, the front vehicle body is pivotally connected to the rear vehicle body, and the seat unit is provided with a first rotating shaft and a second rotating shaft, wherein the first rotating shaft is connected to the front vehicle body, and the second rotating shaft is connected to the slider.

[0013] According to some embodiments of the present application, the backrest unit also includes a backrest connecting rod, one end of which is pivotally connected to the backrest, and the other end of which is pivotally connected to the front vehicle body and / or the rear vehicle body, and the backrest connecting rod can drive the backrest to rotate.

[0014] According to some embodiments of the present application, the seat unit and / or the seat back are pivotally connected to the slider.

[0015] According to some embodiments of the present application, the seat unit is pivotally connected to the front vehicle body, the slider and the seat back, respectively.

[0016] According to some embodiments of the present application, the seat unit, the slider and the seat back are coaxially pivoted.

[0017] According to some embodiments of the present application, the seat back is pivotally connected to the slider, and the seat unit is pivotally connected to the front vehicle body and the seat back, respectively.

[0018] According to some embodiments of the present application, the slider is pivotally connected to the seat back unit, the end of the seat back connecting rod away from the seat back is pivotally connected to the front vehicle body, one end of the seat unit is pivotally connected to the seat back, and the other end of the seat unit is pivotally connected to the front vehicle body and / or the rear vehicle body.

[0019] According to some embodiments of the present application, the mobility scooter further includes a driver, and the driver is used to drive the sliding block to slide relative to the rear vehicle body.

[0020] According to some embodiments of the present application, the rear foot unit further includes an armrest, and the armrest is rotatably connected to the slider.

[0021] According to some embodiments of the present application, the rear foot unit further includes a limiting mechanism, and the limiting mechanism is used to limit the rotation angle of the armrest relative to the slider within a preset range.

[0022] According to some embodiments of the present application, the mobility scooter further includes a control panel, which is disposed on the armrest and is communicatively connected to the driver.

[0023] According to some embodiments of the present application, the mobility scooter further includes a controller, the controller is disposed on the rear vehicle body, and the controller is electrically connected to the driver;

[0024] The rear body is provided with a slide groove, the slider is provided with a first through hole, the armrest is provided with a second through hole, and the mobility scooter also includes a transmission line, one end of which is connected to the controller, and the other end of the transmission line passes through the slide groove, the first through hole and the second through hole in sequence to connect to the control panel.

[0025] According to some embodiments of the present application, the transmission line includes a spiral line segment, and the spiral line segment is located in the rear side vehicle body.

[0026] According to some embodiments of the present application, the mobility scooter further includes a locking mechanism, and the locking mechanism is used to limit the sliding of the slider relative to the rear vehicle body.

[0027] According to some embodiments of the present application, the rear leg unit further includes an anti-rear rollover wheel, and when the mobility scooter is in a folded state, the anti-rear rollover wheel can contact the ground.

[0028] When the mobility scooter of the present application is folded or unfolded, the front leg unit, the rear leg unit and the seat unit move simultaneously, and the folding or unfolding operation is convenient, which is conducive to improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by the present application.

[0030] Figure 1 This is a schematic diagram of a walking vehicle according to an embodiment of the present application. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of a walking vehicle according to an embodiment of the present application. Figure 2 ;

[0032] Figure 3 This is a schematic diagram of the folded state of the mobility scooter according to an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a first implementation of the mobility scooter according to an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of a second implementation of the mobility scooter according to an embodiment of the present application;

[0035] Figure 6 yes Figure 5 The scooter is shown in a folded state;

[0036] Figure 7 is a schematic diagram of a third implementation of the mobility scooter according to an embodiment of the present application;

[0037] Figure 8 yes Figure 7 The scooter is shown in a folded state;

[0038] Fig. 9 is a schematic diagram of a fourth implementation of the mobility scooter according to an embodiment of the present application;

[0039] Fig.10 is a schematic diagram of a fifth implementation of the mobility scooter according to an embodiment of the present application;

[0040] Fig.11 yes Fig.10 The scooter is shown in a folded state;

[0041] Fig.12 This is a schematic diagram of a walking vehicle according to an embodiment of the present application. Figure 3 ;

[0042] Fig.13 This is a schematic diagram of the rotation of the armrest in an embodiment of the present application;

[0043] Fig.14 yes Fig.13 Enlarged view of part A in the middle;

[0044] Fig.15 This is a schematic diagram of a walking vehicle according to an embodiment of the present application. Figure 4 ;

[0045] Fig.16 yes Fig.15 Enlarged view of part B;

[0046] Fig.17 It is a schematic diagram of the locking mechanism of an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following is a clear and complete description of the technical solution of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present application provides a mobility scooter 100, which includes a front leg unit 1, a rear leg unit 2, a seat unit 3, a backrest unit 4 and a slider 5. The mobility scooter 100 is easy to fold and unfold.

[0049] The front foot unit 1 includes a front body 11 and a front wheel 12, the front wheel 12 is located at the bottom of the front body 11, and optionally, the front wheel 12 is a universal wheel or an omnidirectional wheel. The front foot unit 1 also includes a foot pedal 13, which is arranged on the front body 11.

[0050] The rear foot unit 2 includes a rear body 21 and a rear wheel 22, and the rear wheel 22 is arranged at the bottom end of the rear body 21. Optionally, the rear foot unit 2 also includes a motor, and the motor is used to drive the rear wheel 22 to rotate.

[0051] The seat unit 3 is deployed for the user to sit on. The seat unit 3 is pivotally connected to the front vehicle body 11 and / or the rear vehicle body 21. For example, the seat unit 3 is pivotally connected to the top end of the front vehicle body 11, or the seat unit 3 is pivotally connected to the top end of the rear vehicle body 21, or the seat unit 3 is pivotally connected to the front vehicle body 11 and the rear vehicle body 21.

[0052] The backrest unit 4 is connected to the seat unit 3, and the backrest unit 4 is unfolded for the user to lean on. The backrest unit 4 includes a backrest 41, and the backrest 41 is pivotally connected to the seat unit 3 so that the backrest 41 can be folded or unfolded. For example, when folded, the top end of the backrest 41 rotates toward the direction close to the seat unit 3, and when unfolded, the top end of the backrest 41 rotates away from the seat unit 3.

[0053] The slider 5 is slidably disposed on the rear vehicle body 21. For example, the slider 5 can slide along the outer wall of the rear vehicle body 21 toward the top or bottom of the rear vehicle body 21. The slider 5 is pivotally connected to the seat unit 3 and / or the backrest unit 4. For example, the slider 5 is pivotally connected to the seat unit 3, or the slider 5 is pivotally connected to the backrest unit 4, or the slider 5 is pivotally connected to the seat unit 3 and the backrest unit 4.

[0054] When the slider 5 slides, the front body 11 and the rear body 21 move away from or towards each other, and the seat unit rotates, so that the scooter 100 can be unfolded or folded. When the slider 5 slides toward the top of the rear body 21, the front body 11 and the rear body 21 move away from each other, and the seat unit 3 is gradually rotated to a roughly horizontal state, so that the scooter 100 can be unfolded. When the slider 5 slides toward the bottom of the rear body 21, the front body 11 and the rear body 21 move towards each other, and the seat unit 3 is rotated, and the front end of the seat unit 3 tilts up, so that the scooter 100 can be folded. The seat back 41 can rotate synchronously with the seat unit 3, or it can be folded or unfolded separately.

[0055] When the mobility scooter 100 of this embodiment is folded or unfolded, the front leg unit 1 and the seat unit 3 simultaneously move closer to or farther from the rear leg unit 2. The folding or unfolding operation is simple and convenient for users to use.

[0056] like Figure 4 As shown, in some embodiments, the seat back 41 is pivotally connected to the seat unit 3, and the seat back 41 can be folded or unfolded independently. A limiting portion 31 is provided at the rear end of the seat unit 3. When the seat back 41 is unfolded, after the seat back 41 abuts against the limiting portion 31, the limiting portion 31 limits the seat back 41 from further rotating, so as to limit the rotation angle of the seat back 41 relative to the seat unit 3 to a preset range. Figure 4 The arrow in denoted the rotation direction of the seat back 41 .

[0057] In some embodiments, the front body 11 is pivotally connected to the rear body 21, point a is the pivot point between the front body 11 and the rear body 21, and point b is the pivot point between the seat unit 3 and the backrest 41. The seat unit 3 is provided with a first rotating shaft 32 and a second rotating shaft 33, the first rotating shaft 31 is connected to the front body 11, and the second rotating shaft 33 is connected to the slider 5. When the slider 5 slides toward the bottom end of the rear body 21, the bottom end of the front body 11 rotates toward the direction close to the rear body 21, and at the same time, the front end of the seat unit 3 tilts upward, and the top end of the backrest 41 rotates toward the direction close to the seat unit 3, thereby completing the folding of the mobility scooter 100.

[0058] like Figure 5 and Figure 6 As shown, in some embodiments, the backrest unit 4 further includes a backrest link 42, one end of the backrest link 42 is pivotally connected to the backrest 41, and the other end of the backrest link 42 is pivotally connected to the front vehicle body 1 and / or the rear vehicle body 21, and the backrest link 42 can drive the backrest 41 to rotate. Taking the rear vehicle body 21 as an example, the backrest link 42 drives the backrest 41 to rotate, and when the mobility scooter 100 is unfolded or folded, the front vehicle body 1, the seat unit 3 and the backrest 41 rotate simultaneously, so that the user can unfold or fold the mobility scooter 100. Figure 6 The arrow in denoted the sliding direction of the slider 5 .

[0059] In some embodiments, in the unfolded state, the seat back connecting rod 42 is located above the seat unit 3 or is substantially flush with the edge of the seat unit 3. The seat unit 3 and / or the seat back 41 are pivotally connected to the slider 5.

[0060] like Figure 5 As shown, in some embodiments, from front to back, the seat unit 3 is pivotally connected to the front body 11, the slider 5 and the seat back 41 respectively. Optionally, the seat back connecting rod 42 is coaxially pivotally connected to the front body 11 and the rear body 21 at point a. When the slider 5 slides toward the bottom end of the rear body 21, the front body 1, the seat unit 3 and the seat back 41 rotate simultaneously, and the scooter 100 is folded.

[0061] like Figure 7 and Figure 8 As shown, in some embodiments, the seat unit 3 is pivotally connected to the slider 5, the backrest 41 and the front body 11, and the front body 11 is pivotally connected to the rear body 21. The top of the rear body 21 extends upward to above point a, and the end of the backrest connecting rod 42 is pivotally connected to the top of the rear body 21. When the slider 5 slides toward the bottom of the rear body 21, the front body 1, the seat unit 3 and the backrest 41 rotate simultaneously, and the scooter 100 is folded. Figure 8 The arrow in denoted the sliding direction of the slider 5 .

[0062] like Fig. 9As shown, in some embodiments, the front body 11 is pivotally connected to the rear body 21 , the top of the front body 11 extends upward to above point a, and the end of the seat back connecting rod 42 is pivotally connected to the top of the front body 11 .

[0063] like Figure 7 As shown, in some embodiments, the seat unit 3, the slider 5 and the seat back 41 are coaxially pivoted at point b.

[0064] like Fig. 9 As shown, in some embodiments, the seat back 41 is pivotally connected to the slider 5, and the seat unit 3 is pivotally connected to the front vehicle body 11 and the seat back 41 respectively.

[0065] like Fig.10 and Fig.11 As shown, in some embodiments, the backrest link 42 is located below the seat unit 3 in the unfolded state. The slider 5 is pivoted to the backrest unit 4, for example, the slider 5, the backrest 41 and the backrest link 42 are coaxially pivoted. One end of the backrest link 42 away from the backrest 41 is pivoted to the front body 11. One end of the seat unit 3 is pivoted to the backrest 41, and the other end of the seat unit 3 is pivoted to the front body 11 and / or the rear body 21. For example, the seat unit 3 is pivoted to the front body 11 and the rear body 21, respectively, or the seat unit 3, the front body 11 and the rear body 21 are coaxially pivoted. When the slider 5 slides toward the bottom end of the rear body 21, the front body 1, the seat unit 3 and the backrest 41 rotate simultaneously, and the mobility scooter 100 is folded. Fig.11 The arrow in denoted the sliding direction of the slider 5 .

[0066] like Figure 1 and Figure 2 As shown, in some embodiments, the scooter 100 further includes a driver 6, for example, the driver 6 is an electric push rod. The driver 6 can drive the slider 5 to slide relative to the rear body 21. Optionally, one end of the driver 6 is pivotally connected to the rear body 21, and the other end of the driver 6 is connected to the slider 5 through an adapter 52 to drive the slider 5 to slide relative to the rear body 21. The slider 5 slides toward the top end of the rear body 21 to unfold the scooter 100, and the slider 5 slides toward the bottom end of the rear body 21 to fold the scooter 100. The driver 6 provides power for unfolding or folding the scooter 100, thereby improving the user experience.

[0067] like Fig.12 and Fig.13 As shown, in some embodiments, the rear foot unit 2 further includes an armrest 23, and the armrest 23 is rotatably connected to the slider 5. When the slider 5 slides toward the top of the rear vehicle body 21, the armrest 23 is driven to rise, so that the user can use the armrest 23. When the slider 5 slides toward the bottom of the rear vehicle body 21, the armrest 23 is driven to descend and retract. The width D1 of the armrest 23 is greater than the width D2 of the rear vehicle body 21, and the armrest 23 protects the rear vehicle body 21 after being retracted.

[0068] In some embodiments, the rear foot unit 2 further includes a limiting mechanism 24, and the limiting mechanism 24 is used to limit the rotation angle of the armrest 23 relative to the slider 5 to a preset range.

[0069] like Fig.14 As shown, optionally, the limiting mechanism 24 includes a first limiting member 241 and a second limiting member 242. The first limiting member 241 is provided on the armrest 23, for example, the first limiting member 241 is an arc-shaped groove, and the center of the arc-shaped groove is located on the rotation axis of the armrest 23. The second limiting member 242 is provided on the slider 5, and the second limiting member 242 is adapted to the first limiting member 241, for example, the second limiting member 242 is a limiting column, and the limiting column is inserted into the arc-shaped groove to limit the angle range of rotation of the armrest 23 relative to the slider 5.

[0070] like Fig.12 As described, in some embodiments, the scooter 100 further includes a control panel 7. The control panel 7 is disposed at the top of the armrest 23, and the control panel 7 is in communication with the driver 6. The control panel 7 can control the driver 6 to operate so as to control the unfolding or folding of the scooter 100. Optionally, the control panel 7 is also in communication with the drive motor of the rear wheel 22 to control the movement of the scooter 100. A battery is disposed on the rear body 21 of the scooter 100 to power the driver 6 and the drive motor of the rear wheel 22.

[0071] like Figure 1 , Fig.15 and Fig.16 As shown, the mobility scooter 100 further includes a controller 8 . Optionally, the controller 8 is disposed on the rear vehicle body 21 . The controller 8 is electrically connected to the driver 6 . The controller 8 can control the driver 6 to operate.

[0072] The side wall of the rear body 21 is provided with a slide groove 211, which is connected to the inner cavity of the rear body 21 and extends along the length direction of the rear body 21. The slider 5 is provided with a first through hole 51, and the armrest 23 is provided with a second through hole 231. The scooter 100 also includes a transmission line 81, one end of which is connected to the controller 8, and the other end of which passes through the slide groove 211, the first through hole 51 and the second through hole 231 from the inner cavity of the rear body 21 to connect to the control panel 7, and the control panel 7 is connected to the controller 8 in communication. The control panel 7 sends a control signal to the controller 8, and the controller 8 controls the driver 6 to work according to the control signal.

[0073] In some embodiments, the transmission line 81 includes a spiral line segment, and the spiral line segment is located in the inner cavity of the rear vehicle body 21. When the slider 5 slides, the transmission line 81 can follow the sliding of the slider 5 to extend and retract.

[0074] like Fig.17As shown, in some embodiments, the scooter 100 further includes a locking mechanism 9, which is used to limit the sliding of the slider 5 relative to the rear body 21. For example, the locking mechanism 9 includes a spring pin, and the spring pin can use an existing spring pin, and the spring pin is arranged on the side wall of the slider 5. The side wall of the rear body 21 is provided with a first pin hole and a second pin hole adapted to the spring pin. When the slider 5 slides to the upper limit of the stroke, the spring pin can be inserted into the first pin hole to keep the scooter 100 in the unfolded state. When the slider 5 slides to the lower limit of the stroke, the spring pin can be inserted into the second pin hole to keep the scooter 100 in the folded state, which is convenient for manual operation of the scooter 100 to be folded or unfolded.

[0075] like Fig.12 and Fig.15 As shown, in some embodiments, the rear foot unit 2 further includes an anti-rollover wheel 25, which is disposed on the rear vehicle body 21. In the unfolded state, when both the front wheel 12 and the rear wheel 22 are in contact with the ground, the anti-rollover wheel 25 is not in contact with the ground. When the rear wheel 22 is in contact with the ground and the scooter 100 slightly rolls backward, and when the front wheel 12 is off the ground, the anti-rollover wheel 25 can be in contact with the ground to prevent the scooter 100 from excessively rolling backward, thereby improving the safety of the scooter 100. Optionally, after the scooter 100 is folded, the front wheel 12 and the anti-rollover wheel 25 are in contact with the ground together, and the rear wheel 22 is off the ground.

[0076] When the mobility scooter 100 of the present embodiment is folded, the front leg unit 1, the seat unit 3 and the backrest unit 4 are all moved closer to the rear leg unit 2 and folded roughly into an umbrella shape, which is easy to operate and improves the user experience.

[0077] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core ideas of the present application. Therefore, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A mobility scooter, characterized in that: include: A front foot unit, comprising a front vehicle body and a front wheel, wherein the front wheel is arranged on the front vehicle body; A rear leg unit, comprising a rear vehicle body and a rear wheel, wherein the rear wheel is arranged on the rear vehicle body; A seat unit, pivotally connected to the front vehicle body and / or the rear vehicle body; A chair back unit, comprising a chair back, the chair back being pivotally connected to the seat unit; A slider, slidably disposed on the rear vehicle body, the slider being pivotally connected to the seat unit and / or the seat back unit; When the sliding block slides, the front vehicle body and the rear vehicle body move away from or closer to each other, and at the same time, the seat unit rotates.

2. The scooter according to claim 1, characterized in that: The seat unit is provided with a limiting portion, and the limiting portion is used to limit the rotation angle of the seat back relative to the seat unit within a preset range.

3. The mobility scooter according to claim 2, characterized in that: The front vehicle body is pivotally connected to the rear vehicle body, and the seat unit is provided with a first rotating shaft and a second rotating shaft, wherein the first rotating shaft is connected to the front vehicle body, and the second rotating shaft is connected to the slider.

4. The scooter according to claim 1, characterized in that: The seat back unit also includes a seat back connecting rod, one end of which is pivotally connected to the seat back, and the other end of which is pivotally connected to the front vehicle body and / or the rear vehicle body, and the seat back connecting rod can drive the seat back to rotate.

5. The mobility scooter according to claim 4, characterized in that: The seat unit and / or the seat back are pivotally connected to the slider.

6. The mobility scooter according to claim 5, characterized in that: The seat unit is pivotally connected to the front vehicle body, the slider and the seat back respectively.

7. The mobility scooter according to claim 6, characterized in that: The seat unit, the slider and the seat back are coaxially pivoted.

8. The mobility scooter according to claim 5, characterized in that: The seat back is pivotally connected to the slider, and the seat unit is pivotally connected to the front vehicle body and the seat back respectively.

9. The mobility scooter according to claim 4, characterized in that: The slider is pivotally connected to the seat back unit, the end of the seat back connecting rod away from the seat back is pivotally connected to the front vehicle body, one end of the seat unit is pivotally connected to the seat back, and the other end of the seat unit is pivotally connected to the front vehicle body and / or the rear vehicle body.

10. The mobility scooter according to claim 1, characterized in that: It also includes a driver, which is used to drive the sliding block to slide relative to the rear vehicle body.

11. The mobility scooter according to claim 10, characterized in that: The rear foot unit further includes an armrest, and the armrest is rotatably connected to the slider.

12. The mobility scooter according to claim 11, characterized in that: The rear foot unit further comprises a limiting mechanism, and the limiting mechanism is used to limit the rotation angle of the armrest relative to the sliding block within a preset range.

13. The mobility scooter according to claim 11, characterized in that: It also includes a control panel, which is arranged on the armrest and is communicatively connected with the driver.

14. The mobility scooter according to claim 13, characterized in that: It also includes a controller, which is disposed on the rear vehicle body and is electrically connected to the driver; The rear body is provided with a slide groove, the slider is provided with a first through hole, the armrest is provided with a second through hole, and the mobility scooter also includes a transmission line, one end of which is connected to the controller, and the other end of the transmission line passes through the slide groove, the first through hole and the second through hole in sequence to connect to the control panel.

15. The mobility scooter according to claim 14, characterized in that: The transmission line includes a spiral line segment, and the spiral line segment is located in the rear side vehicle body.

16. The mobility scooter according to claim 1, characterized in that: It also includes a locking mechanism, which is used to limit the sliding block from sliding relative to the rear vehicle body.

17. The mobility scooter according to claim 1, characterized in that: The rear leg unit further comprises anti-rear rollover wheels, and when the mobility scooter is in a folded state, the anti-rear rollover wheels can contact the ground.

Images