CN214240946U - Electric cart - Google Patents

Abstract

The utility model provides an electric cart, electric cart includes: a vehicle body; the driving mechanism is arranged on the vehicle body to drive the vehicle body to move; the armrest frame is mounted on the vehicle body; the battery pack assembly is arranged on the armrest frame and supplies power to the driving mechanism, and comprises a battery pack base and a battery pack arranged on the battery pack base; the battery pack base is movably and fixedly arranged on the armrest frame, so that the relative position relation between the battery pack assembly and the vehicle body can be adjusted according to requirements, and the loading space of the electric cart can be adjusted. The utility model discloses electric cart is through with battery package subassembly fixed mounting on handrail frame to make the user can change the battery package fast and conveniently.

Description

Electric cart

Technical Field

The utility model relates to an electric cart.

Background

The self-propelled wheeled cart is a battery-driven cart for transporting goods, is also called an electric flat car or an electric cart, has the advantages of simple structure, convenient use, easy maintenance, large bearing capacity, less pollution and the like, and is widely used for transporting goods in factory workshops, airports, families and the like. The cart with the self-driving function does not need to be pushed by an operator with great effort, so that the labor intensity of the operator is greatly reduced. With battery powered carts, the batteries are typically mounted stationary below the chassis of the cart, thereby preventing the user from conveniently and quickly replacing the batteries.

In view of the above problems, there is a need to provide a new electric cart to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric trolley, this electric trolley is through wrapping battery subassembly fixed mounting on handrail frame to make the user can change the battery package fast and conveniently.

In order to achieve the above object, the utility model provides an electric cart, include: a vehicle body; the driving mechanism is arranged on the vehicle body to drive the vehicle body to move; the armrest frame is mounted on the vehicle body; the battery pack assembly is arranged on the armrest frame and supplies power to the driving mechanism, and comprises a battery pack base and a battery pack arranged on the battery pack base; the battery pack base is movably and fixedly arranged on the armrest frame, so that the relative position relation between the battery pack assembly and the vehicle body can be adjusted according to requirements, and the loading space of the electric cart can be adjusted.

As a further improvement of the utility model, the handrail frame comprises a frame body and a cross bar arranged on the frame body; the frame body comprises a cross rod part and a pair of arm parts which are respectively bent outwards and extended from two ends of the cross rod part; one end of the arm part, which is far away from the cross rod part, is arranged on the vehicle body; both ends of the bar are fixedly mounted on the pair of arm portions, respectively.

As a further improvement of the utility model, the electric cart further comprises a quick clamping lock, the quick clamping lock will battery pack assembly fixed mounting be in the handrail frame deviates from one side of automobile body or is close to one side of automobile body.

As a further improvement, the quick clamp lock includes a connecting rod passing through the battery pack assembly and the corresponding arm, a knob and a pin joint at one end of the connecting rod are installed at the quick clamp handle at the other end of the connecting rod.

As a further improvement of the utility model, the quick clamping handle and the battery pack assembly are arranged on the same side of the armrest frame.

As a further improvement of the present invention, the quick clamp lock includes a pad provided between the quick clamp handle and the arm.

As a further improvement of the utility model, the quick clamping handle is provided with an eccentric part matched with the cushion block.

As a further improvement of the present invention, the battery pack assembly includes a loading plate, the loading plate includes a plate portion and a setting between a pair of arms of the armrest frame are in the opposite ends of the plate portion and corresponding to the matching portion of the arms.

As a further improvement of the utility model, the actuating mechanism is including installing in the in-wheel motor of automobile body below and installing wheel on the in-wheel motor.

As a further improvement of the utility model, the electric cart further comprises universal wheels mounted below the cart body; the universal wheels are located on one side, close to the handrail frame, of the vehicle body, and the driving mechanism is located on one side, away from the handrail frame, of the vehicle body.

The utility model has the advantages that: the utility model discloses electric cart is through with battery package subassembly fixed mounting on handrail frame to make the user can change the battery package fast and conveniently.

Drawings

Fig. 1 is a perspective view of an electric cart according to an embodiment of the present invention.

Fig. 2 is a perspective view of the electric cart shown in fig. 1 from another perspective.

Fig. 3 is a side view of the battery pack assembly of the motorized cart of fig. 1 mounted on a first side of a first elevation.

Fig. 4 is a side view of the powered cart of fig. 3 shown separated from the battery pack assembly.

Fig. 5 is a side view of the battery pack assembly of the motorized cart shown in fig. 3 mounted at a second side of the first height opposite the first side.

Fig. 6 is a side view of the battery pack assembly of the motorized cart shown in fig. 1 mounted on a first side of a second elevation.

Fig. 7 is a side view of the powered cart of fig. 6 shown separated from the battery pack assembly.

Fig. 8 is a side view of the battery pack assembly of the motorized cart shown in fig. 6 mounted at a second side of the second height opposite the first side.

Fig. 9 is a perspective view of the battery pack assembly shown in fig. 1.

Fig. 10 is a partially exploded view of the battery pack assembly shown in fig. 9.

Fig. 11 is a partially exploded view of the control assembly and armrest frame of the electric cart shown in fig. 1.

Fig. 12 is a perspective view of a control assembly of the electric cart shown in fig. 1.

Fig. 13 is a perspective view from another perspective of the control assembly of the electric cart shown in fig. 12.

Fig. 14 is a perspective view of yet another perspective of the control assembly of the electric cart shown in fig. 12.

Fig. 15 is a perspective view of the upper housing of the control assembly shown in fig. 12.

Fig. 16 is a perspective view of the lower housing of the control assembly shown in fig. 12.

Fig. 17 is an exploded view of a control panel and a membrane key assembly according to an embodiment of the present invention.

Fig. 18 is a perspective view of the control assembly and the armrest frame of the present invention at another angle.

Fig. 19 is a perspective view of the lower left operating handle and the lower right operating handle according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the present invention discloses an electric cart 100, which includes a cart body 10, a driving mechanism 20 installed on the cart body 10 for driving the cart body 10 to move, a handrail frame 30 installed on the cart body 10, a battery pack assembly 40 installed on the handrail frame 30 for supplying power to the driving mechanism 20, and a control assembly 50 installed on the handrail frame 30 for controlling the electric cart 100.

Referring to fig. 1 and 2, the vehicle body 10 includes a horizontally disposed carrying portion 11, and the carrying portion 11 is used for carrying cargo. In the present embodiment, the upper surface of the carrying portion 11 is a plane, but in other embodiments, the shape of the upper surface of the carrying portion 11 may also be set as required. The drive mechanism 20 is mounted below the carrier 11. In the present embodiment, the driving mechanism 20 includes an in-wheel motor 21 mounted on the bottom of the vehicle body 10 and a wheel 22 mounted on the in-wheel motor 21. Further, the electric cart 100 further includes a universal wheel 60 installed below the bearing portion 11. In the present embodiment, the universal wheels 60 are located on the side of the vehicle body 10 close to the armrest frame 30, and the driving mechanism 20 is located on the side of the vehicle body 10 away from the armrest frame 30; however, in other embodiments, the driving mechanism 20 may be disposed on a side of the vehicle body 10 close to the armrest frame 30, and the universal wheel 60 may be disposed on a side of the vehicle body 10 away from the armrest frame 30.

Referring to fig. 1 and 2, the armrest frame 30 is mounted on the vehicle body 10 and perpendicular to the bearing part 11. However, in other embodiments, the included angle between the armrest frame 30 and the carrying portion 11 may be set according to needs, and the present invention is not limited thereto. The armrest frame 30 includes a frame body 34 and a cross bar 33 mounted on the frame body 34. The frame 34 includes a cross bar 32 and a pair of arms 31 respectively bent and extended outward from two ends of the cross bar 32. The crossbar 32 is substantially V-shaped, and the pair of arms 31 are arranged in parallel with each other. The bar 33 is mounted between the pair of arm portions 31 and is substantially perpendicular to the arm portions 31. The end of the arm 31 facing away from the crossbar 32 is mounted to the vehicle body 10. The arm portion 31 is provided with at least two mounting holes 310 penetrating the arm portion 31 in the vertical direction. In the present embodiment, the arm portion 31 is fixedly mounted on the vehicle body 10; however, in other embodiments, the arm 31 may also be pivotally mounted on the vehicle body 10, so that a user can adjust an included angle between the arm 31 and the carrying portion 11 as needed to meet different application scenarios. The cross bar 33 is located between the pair of arm portions 31, and both ends thereof are fixedly attached to the pair of arm portions 31, respectively, to enhance rigidity of the pair of arm portions 31 in the lateral direction. Preferably, the bar 33 may also be configured to support the battery pack base 41 or the battery pack assembly 40 to share the force between the battery pack base 41 and the arm 31. In the present embodiment, the number of the bars 33 is 2, but in other embodiments, the number of the bars 33 may be set as needed, which is not limited by the present invention. In the present embodiment, the armrest frame 30 is substantially U-shaped, but in other embodiments, the shape of the armrest frame 30 may be designed as required.

Referring to fig. 1 to 10, the battery pack assembly 40 includes a battery pack base 41 mounted on the handle frame 30, at least one battery pack 42 replaceably received in the battery pack base 41, and a control board 43 received in the battery pack base 41. The battery pack base 41 is detachably mounted to the handle frame 30, that is, the battery pack assembly 40 is detachably mounted to the handle frame 30. In the present embodiment, the number of the battery packs 42 is two. Of course, it is understood that the number of battery packs 42 may be set as desired. The two or more number of battery packs 42 are horizontally spaced apart. The two or more battery packs 42 may be designed to be electrically connected to the driving mechanism 20 after being connected in parallel, so that the input current is increased by the parallel power supply of the two or more battery packs 42, and thus a larger power is obtained under the same voltage. The two or more battery packs 42 may also be designed to be electrically connected to the driving mechanism 20 after being connected in series, so that the two or more battery packs 42 are connected in series to supply power to increase the input voltage, thereby obtaining greater power to adapt to battery packs with different voltages. Of course, the two or more battery packs 42 may also be designed to switchably individually power the drive mechanism 20, so that the drive mechanism 20 is cycled by the automatic switching of two or more battery packs 42. At this time, preferably, the electric cart 100 may further be provided with an indication element (not shown) indicating the power of the battery pack 42 to remind the user of the power of the battery pack. When the power of a certain battery pack is used up, the user can take out the battery pack and charge the battery pack. So set up, can realize the uninterrupted duty of electronic shallow 100.

Referring to fig. 9 and 10, the battery pack base 41 includes a receiving cavity 410 for receiving the battery pack 42 and a cover 411 engaged with the receiving cavity 410 to cover the corresponding battery pack 42. The two covers 411 can be opened in a direction approaching each other to expose the corresponding receiving cavity 410. The cover 411 and the corresponding accommodating cavity 410 completely wrap the battery pack 42, so that the battery pack 42 can be protected, failure and short circuit can not occur when the battery pack is rained, and the safety and reliability of the battery pack 42 are improved. When operation is desired, the battery pack 42 is inserted into the corresponding receiving cavity 410. Preferably, the battery pack base 41 is further provided with a release button (not shown) and an elastic member (not shown) located in the receiving cavity 410. When the battery pack 42 is placed in the accommodating cavity 410, the release button is pressed, and the battery pack 42 is locked in the accommodating cavity 410 through a buckle on the release button, and at the moment, the elastic element is elastically deformed; when the battery pack 42 needs to be taken out, the releasing button is pressed again to stop the bayonet from locking the battery pack 42, at this time, the elastic element will be reset, and part of the battery pack 42 is ejected out of the accommodating cavity 410, so that the user can take out the battery pack 42 conveniently. The battery pack 42 may also be designed to be the same size as battery packs used by other power tools, such as: the battery package that garden instrument used, the battery package that the electric drill used to reduce the battery package quantity that the user need purchase, and then reduce user's use cost. Meanwhile, by the arrangement, the utilization rate of the battery pack 42 can be improved. And, because the battery pack assembly 40 and the armrest frame 30 are designed separately, it is convenient for designers to optimize the packaging size.

Referring to fig. 9 and 10, the battery pack assembly 40 further includes a supporting plate 44, and the battery pack base 41 is fixedly mounted on the supporting plate 44. The carrier plate 44 includes a plate-shaped portion 440 engaged with the battery pack base 41, and engaging portions 441 provided at opposite ends of the plate-shaped portion 440 to be engaged with the respective arm portions 31. The plate-shaped portion 440 is disposed between the pair of arm portions 31 of the armrest frame 30, and the engagement portion 441 is provided with a fixing hole 4411 engaged with the mounting hole 310. Referring to fig. 10, the battery pack base 41 is fixedly connected to the supporting plate 44 by screws 442. The battery pack assembly 40 is further provided with a safety key 45, and when the safety key 45 is pulled out when the battery pack assembly is not used, the electric cart 100 cannot be started. The battery pack assembly 40 further includes a socket (not shown) to removably power the drive mechanism 20.

Referring to fig. 1 to 8, the battery pack base 41 is detachably mounted on the handle frame 30. Preferably, the electric cart 100 further includes a pair of quick clamp locks 70 to hold the battery pack base 41 on the handle frame 30. The quick clamping lock 70 includes a connecting rod 71 passing through the battery pack assembly 40 and the mounting hole 310 of the arm 31, a knob 72 connected to one end of the connecting rod 71, a quick clamping handle 73 pivotally mounted to the other end of the connecting rod 71, and a spacer 74 disposed between the quick clamping handle 73 and the corresponding arm 31. Since the arm 31 is provided with at least two mounting holes 310 along the length direction thereof, the distance between each mounting hole 310 and the vehicle body 10 is different, thereby facilitating the user to adjust the mounting height of the battery pack assembly 40 as desired. When the battery pack assembly 40 is used, the battery pack assembly is placed on the armrest frame 30, one end of the connecting rod 71, which is far away from the quick clamping handle 73, sequentially penetrates through the cushion block 74, the fixing hole 4411 and the mounting hole 310, and then the knob 72 is mounted on the connecting rod 71. Finally, the quick clamping handle 73 is rotated, so that the eccentric portion 731 of the quick clamping handle 73 abuts against the pad 74, thereby firmly fixing the battery pack assembly 40. Meanwhile, the battery pack assembly 40 is connected with the hub motor 21 and the control assembly 50 of the driving mechanism 20 of the electric cart 100 through the socket. When the battery pack assembly 40 is not needed to be used, the battery pack assembly can be disassembled to be stored better, and the storage space is saved.

In the present embodiment, in order to facilitate the user to adjust the mounting height of the battery pack assembly 40, the arm 31 is implemented by a plurality of mounting holes 310 provided along the extending direction of the arm 31. However, this structure still has inconvenience. When the user needs to adjust the installation height of the battery pack assembly 40, the user needs to detach the quick clamping lock 70, move the battery pack assembly 40 up or down to another installation hole 310, and then re-install and fix the quick clamping lock 70. So set up for the operation is relatively loaded down with trivial details. In order to simplify the step of adjusting the mounting height of the battery pack assembly 40, it is preferable that a stroke groove (not shown) is provided between the adjacent mounting holes 310 so that the quick clamp lock 70 moves from one mounting hole 310 to the other mounting hole 310 through the stroke groove.

Referring to fig. 1 to 4, 6 and 7, the pair of quick-clamping locks 70 selectively hold the battery pack assembly 40 on one of opposite sides of the handle frame 30, at which time the battery pack assembly 40 is held on the outside of the handle frame 30. Referring to fig. 5 and 8, the battery pack assembly 40 is held at the inner side of the handle frame 30, and the battery pack assembly 40 may be held at different heights at the inner side of the handle frame 30. The quick clamping handle 73 and the battery pack assembly 40 are arranged on the same side of the two opposite sides of the armrest frame 30, that is, when the battery pack assembly 40 is arranged on the outer side of the armrest frame 30, the quick clamping handle 73 is also arranged on the outer side of the armrest frame 30, and vice versa. The battery pack assembly 40 is detachably mounted at different positions of the armrest frame 30 to realize that the electric cart 100 has different loading spaces, so that the maximum transportation capacity of the electric cart 100 can be realized by replacing different positions of the battery pack assembly 40 when goods are placed.

Referring to fig. 11-16, the control assembly 50 is mounted at the middle of the crossbar portion 32. The control assembly 50 includes a fixing base 500, and the fixing base 500 includes an upper fixing base 501 and a lower fixing base 502 capable of cooperating with the upper fixing base 501. In this embodiment, the control assembly 50 includes a control panel 51 mounted on the fixing base 500 and close to the operator (the control panel 51 faces the operator, so that the operator can use the control panel), forward and backward buttons 52 for controlling the walking direction of the electric cart 100, a speed-adjusting knob 53 for adjusting the walking speed of the electric cart 100, a start key 54, a lower left operating handle 55, and a lower right operating handle 56. The control panel 51 is further provided with a travel control switch (not shown), a main power supply control switch (not shown), and a main power supply control switch (not shown). The control panel 51 is fixed on the armrest frame 30 by a screw 510. The control panel 51 includes a power display area 511 to display the power of the battery pack assembly 40. In this embodiment, the power display area 511 is a set of LED lamps capable of displaying power, and the number of the set of LED lamps corresponds to the number of the battery packs 42. Each LED lamp holder comprises 4 LED lamps to display the quantity of electric quantity. Preferably, referring to fig. 16, the control panel 51 is further provided with a film key assembly 512. The membrane key assembly 512 is attached to the operator-facing side of the control panel 51 by a back adhesive. In this embodiment, the charge amount display area 511 and the forward and backward buttons 52 are integrally provided on the film key assembly 512. Of course, it is understood that in other embodiments, other keys may be integrated on the membrane key assembly 512, such as: the speed adjusting knob 53 is not limited in this regard. The control panel 51 is fixed on the armrest frame 30 by screws 510, and a rubber sleeve (not shown) may be disposed to penetrate the control panel 51, so as to increase the comfort and safety insulation for the user to hold. The activation key 54 is capable of activating the main power control switch. The left lower operating handle 55 and the right lower operating handle 56 can trigger the travel control switch. The left lower operating handle 55 and the right lower operating handle 56 are pivotally mounted on the control assembly 50 through pivot shafts 551 and 561, respectively, so that the left lower operating handle 55 and the right lower operating handle 56 can rotate around the pivot shafts 551 and 561. The axes of the pivot shafts 551, 561 are substantially perpendicular to the plane of the crossbar portion 32. Due to the arrangement, a user can toggle the left lower operating handle 55 or the right lower operating handle 56 through a thumb, the left lower operating handle 55 or the right lower operating handle 56 is attached to the cross rod part 32, the walking control switch is triggered, the ergonomics is met, and meanwhile the comfort of holding of the user is improved. Referring to fig. 19, the left lower operating handle 55 and the right lower operating handle 56 are further provided with a supporting arm 552 and a supporting arm 562 respectively, which are matched with the walking control switch, and the supporting arms 552 and 562 support a lever (not shown in the figure) and trigger the walking control switch through the lever. Preferably, referring to fig. 18, the control assembly 50 is further provided with a left brake handle 57 and a right brake handle 58 to realize a disc brake or hub brake function. The left and right lower operating handles 55, 56 are disposed below or directly below the crossbar portion 32, and the left and right brake handles 57, 58 are disposed in front of or directly in front of the crossbar portion 32. Of course, it is understood that in other embodiments, the positions of the left and right lower operating handles 55, 56 and the positions of the left and right brake handles 57, 58 may be interchanged.

When the electric cart 100 is required to self-propel, the operator first presses the start key 54 to activate the main power control switch to activate the electric cart 100, then pulls the left lower operating handle 55 and/or the right lower operating handle 56 to activate the main power control switch (not shown), and then releases the start key 54 to activate the driving mechanism 20 to self-propel the electric cart 100 and pull the cargo. When the operator releases the left and right lower operating handles 55 and 56, the driving mechanism 20 may be stopped so that the electric cart 100 stops self-traveling. Of course, the operator may press the start key 54 first and then pull either the left lower operation handle 55 or the right lower operation handle 56 to start the driving mechanism 20.

The speed knob 53 is geared to dial the potentiometer. The speed control knob 53 can control the traveling speed of the electric cart 100. When the electric cart 100 is controlled to self-propel, the speed control knob 53 can be toggled to adjust the traveling speed of the in-wheel motor 21, thereby adjusting the traveling speed of the electric cart 100.

The control panel 51 may further be provided with a brake, and the brake is controlled by the left lower operating handle 55 and the right lower operating handle 56 to brake the hub motor. When the operator releases the lower left and right operating handles 55, 56, the electric cart 100 can be set to activate the braking mechanism at a set time, and when the operator presses the activation key 54 again, the braking mechanism is deactivated. To prevent the electric cart 100 from moving by itself in the case where the ground is not flat. The brake is electronic brake, by software control, when unclamping lower left operating handle and lower right operating handle, electronic shallow 100 starts the brake function within 1 second. When the start key 54 is pressed, the brake function is disabled, the electric cart 100 can be pushed by hand, or the start key 54 and the left lower operating handle 55 or the right lower operating handle 56 can be simultaneously pressed to start the main motor of the electric cart 100, and simultaneously the start key 54 is released, so that the electric cart 100 starts to walk and pull goods.

Compared with the prior art, the utility model discloses electric cart 100 is owing to incite somebody to action battery package subassembly 40 fixed mounting is in on the handrail frame 30 to the user of being convenient for realizes through changing the battery package the uninterrupted duty of electric cart 100, and then has solved the not enough problem of current electric cart duration.

The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. An electric cart (100), comprising:

a vehicle body (10);

a driving mechanism (20), wherein the driving mechanism (20) is installed on the vehicle body (10) to drive the vehicle body (10) to move;

a handrail frame (30), the handrail frame (30) being mounted on the vehicle body (10); and

a battery pack assembly (40), the battery pack assembly (40) being mounted on the armrest frame (30) and supplying power to the drive mechanism (20), including a battery pack base (41) and a battery pack (42) mounted on the battery pack base (41); the battery pack base (41) is movably and fixedly arranged on the handrail frame (30) so as to adjust the relative position relation between the battery pack assembly (40) and the vehicle body (10) according to requirements, thereby adjusting the loading space of the electric cart (100).

2. The motorized cart (100) of claim 1, wherein: the armrest frame (30) comprises a frame body (34) and a cross bar (33) arranged on the frame body (34); the frame body (34) comprises a cross rod part (32) and a pair of arm parts (31) which are respectively bent outwards and extended from two ends of the cross rod part (32); one end of the arm part (31) departing from the cross rod part (32) is arranged on the vehicle body (10); both ends of the horizontal bar (33) are fixedly mounted on the pair of arm portions (31), respectively.

3. The motorized cart (100) of claim 2, wherein: the electric cart (100) further comprises a quick clamping lock (70), and the battery pack assembly (40) is fixedly installed on one side, away from the cart body (10), of the armrest frame (30) or close to one side of the cart body (10) through the quick clamping lock (70).

4. The motorized cart (100) of claim 3, wherein: the quick clamping lock (70) comprises a connecting rod (71) penetrating through the battery pack assembly (40) and the corresponding arm part (31), a knob (72) installed at one end of the connecting rod (71), and a quick clamping handle (73) pivotally installed at the other end of the connecting rod (71).

5. The motorized cart (100) of claim 4, wherein: the quick clamping handle (73) and the battery pack assembly (40) are arranged on the same side of the armrest frame (30).

6. The motorized cart (100) of claim 4, wherein: the quick clamp lock (70) includes a pad (74) disposed between the quick clamp handle (73) and the arm (31).

7. The motorized cart (100) of claim 6, wherein: the quick clamping handle (73) is provided with an eccentric part (731) which is matched with the cushion block (74).

8. The motorized cart (100) of claim 2, wherein: the battery pack assembly (40) includes a carrier plate (44), and the carrier plate (44) includes a plate-shaped portion (440) disposed between a pair of arm portions (31) of the armrest frame (30), and engaging portions (441) disposed at opposite ends of the plate-shaped portion (440) and engaged with the respective arm portions (31).

9. The motorized cart (100) of claim 1, wherein: the driving mechanism (20) comprises an in-wheel motor (21) arranged below the vehicle body (10) and a wheel (22) arranged on the in-wheel motor (21).

10. The motorized cart (100) of claim 9, wherein: the electric cart (100) further comprises universal wheels (60) mounted below the cart body (10); the universal wheels (60) are located on one side, close to the armrest frame (30), of the vehicle body (10), and the driving mechanism (20) is located on one side, deviating from the armrest frame (30), of the vehicle body (10).

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