Crawler

Abstract

The crawler comprises a frame with the rear end used for being pulled by a hand, two front wheels which are arranged in a left-right spaced mode are rotationally assembled at the front end of the frame, a folding frame is further rotationally assembled at the front end of the frame, and the rotating axis of the folding frame extends in the left-right direction. The folding frame is provided with a folding station parallel to the frame and an unfolding station forming a preset angle with the frame in the rotating process, the preset angle ranges from 60 degrees to 120 degrees, at least one rear wheel is arranged on the frame and / or the folding frame, the rear wheels are located on the rear sides of the front wheels, and a handle sleeve part used for being held by a user in the crawling process is arranged at the front end of the folding frame or the front end of the frame. The grip kit comprises a grip and a brake unit used for controlling the brake of the front wheel. The crawler provided by the utility model not only can be used as a goods cart, but also can assist the old in crawling exercise.

Description

Technical Field

[0001] This utility model relates to the technical field of fitness equipment, and in particular to a crawler. Background Technology

[0002] Folding trolleys are portable transportation tools widely used for shopping, carrying items, and moving goods. Their lightweight design makes them easy to fold and store, suitable for various occasions, and particularly popular with elderly users, making it more convenient for them to carry items while traveling or going to the market to buy groceries.

[0003] In current technology, to improve their physical fitness, older adults often exercise in their spare time, with crawling being a popular exercise. Crawling distributes body weight across the limbs, reducing the load on various parts of the body, especially the lumbar spine, thus offering some therapeutic benefits for preventing and treating lumbar spine diseases, lumbar muscle strain, and various cervical, shoulder, and spinal conditions. However, because crawling typically involves moving forward on both hands and feet, it's impossible to carry a trolley used for carrying items during the exercise, potentially leading to its loss. Not carrying a trolley, on the other hand, leaves the user physically exhausted after exercise, requiring them to carry groceries or other household items home manually, increasing the burden on their body.

[0004] Therefore, this application proposes a crawling device that can be used as a stroller so that elderly users can take it out shopping normally, and at the same time, it can also serve as a crawling exercise aid. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a crawling device that can be used as a cargo cart and also to assist the elderly in crawling exercises.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A crawler includes a frame with a rear end for hand-pulling, two front wheels spaced apart on the left and right sides rotatably mounted at the front end of the frame, and a folding frame rotatably mounted at the front end of the frame. The rotation axis of the folding frame extends in the left-right direction. During rotation, the folding frame has a folding position that rotates towards the rear end of the frame and an unfolding position that rotates away from the rear end of the frame. At least one rear wheel is provided on the frame and / or the folding frame, which is located behind the front wheels. A grip kit for a user to hold while crawling is provided at the front end of the folding frame or the frame. The grip kit includes a grip and a brake unit for braking control of the front wheels.

[0008] The front end of the frame is fitted with an axle, and the two ends of the axle are connected to the front wheel. The bottom of the frame is connected to an elastic band.

[0009] The folding frame is rotatably connected to the frame near the front wheel, and a rotating unit is provided at the connection point. The front end of the folding frame is connected to a grip kit for controlling the front wheel, and the rear end of the folding frame is provided with multiple mounting slots spaced apart.

[0010] The rear wheel assembly is connected to the rear end of the folding frame. The rear wheel assembly includes a rear wheel, an upper housing, and a lower housing. The upper housing and the lower housing are respectively located at the top and bottom of the mounting slot. The upper housing and the lower housing are respectively provided with grooves on opposite sides. When the upper housing and the lower housing are spliced, the two grooves form an installation space for clamping the pipe. The rear wheel is rotatably connected to the bottom of the lower housing.

[0011] Furthermore, the rotating unit includes a turntable and a collar. The collar is fixedly connected to the frame. The turntable is rotatably connected to the side of the collar away from the frame. A limit block is fixedly connected to the side of the turntable away from the front wheel. A right-angle notch is provided on the outer wall of the collar for the movement of the limit block.

[0012] Furthermore, the grip kit includes a grip, a brake unit, a lifting rod, and a locking unit. The front left and right edges of the folding frame are provided with storage slots. The side walls of the storage slots are provided with track grooves along the length of the storage slots. Two lifting rods are provided in the storage slots. The bottom end of one lifting rod is rotatably connected to one end of the storage slot, and the bottom end of the other lifting rod is connected to the track groove through the locking unit. The two lifting rods cross to form a scissor lifting mechanism. The top ends of the two lifting rods are connected to the grip, and the grip is connected to the front wheel through the brake unit.

[0013] Furthermore, the braking unit includes a brake plate, a brake lever, and a brake unit. The brake unit is fixedly connected to the side wall of the front wheel. Both ends of the handle are fixedly connected to brake plates. A groove is provided on the opposite side of each of the two brake plates. The brake lever is slidably disposed in the groove. One end of the brake lever is connected to the brake unit through a brake cable. The side of the brake lever near the handle is connected to the groove through a compression spring.

[0014] Furthermore, the locking unit includes a locking block, a supporting spring, and a lever block. The end of the lifting rod has a circular hole, and a locking block is slidably disposed at both opening positions of the circular hole. Both ends of the track groove have locking grooves for locking the locking blocks. A supporting spring is fixedly connected between the two locking blocks. A lever block is fixedly connected to the outer wall of the two locking blocks. A square groove for sliding the lever block is provided on the outer wall of the lifting rod.

[0015] Furthermore, the front side of the brake lever is provided with multiple arc-shaped grooves for placing fingers, and the edges of the arc-shaped grooves are rounded.

[0016] Furthermore, it also includes an extension frame, which is C-shaped. Circular grooves are provided on the left and right rear sides of the frame, and threaded sleeves are rotatably connected to the openings of the circular grooves. The ends of the extension frame are threadedly connected to the threaded sleeves.

[0017] Furthermore, the diameter of the front wheel is larger than the diameter of the rear wheel, causing the frame to be tilted with the front higher than the rear.

[0018] Furthermore, when the workstation is unfolded, the angle between the folding frame and the vehicle frame is 60°~120°.

[0019] In summary, this utility model has at least one of the following beneficial technical effects:

[0020] 1. The crawler in this utility model can achieve two functions: 1. It can be used as a foldable portable shopping cart. When not carrying goods, the folding frame is located in the stowed position. The user pulls the rear end of the frame, the rear wheels are off the ground, and the front wheels are in contact with the ground, which facilitates the overall movement of the crawler. When goods need to be carried, the user flips the folding frame to the unfolded position, and the goods can be placed between the folding frame and the frame, thereby realizing the transportation of goods. 2. When not used as a shopping cart, this crawler can be used as an auxiliary tool to assist in crawling training. Specifically, the folding frame is stowed to the stowed position arranged parallel to the frame, and the front and rear wheels are in contact with the ground at the same time, forming a stable walking mechanism. The user holds the handle and is in a crawling posture. When the front wheels need to be stopped, the braking unit controls the front wheels to not turn. When the front wheels need to turn, the braking unit releases the locking of the front wheels.

[0021] 2. This type of crawler, by making the diameter of the front wheel larger than the diameter of the rear wheel, allows the crawler to tilt in a front-high-rear-low position. When the user grips the front of the crawler, the crawler can elevate the user's forelimbs, adjusting the user's center of gravity during crawling exercise, thus making crawling exercise easier. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a crawler according to the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of the circular groove in a crawler according to the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the grip kit in a crawler of this utility model when it is unfolded.

[0026] Figure 4 This is a schematic diagram of the structure of the storage slot in a crawler according to the present invention.

[0027] Figure 5 This is a schematic diagram of the snap-fit ​​unit in a crawler according to the present invention.

[0028] Figure 6 This is a schematic diagram of the rear wheel assembly in a crawler according to the present invention.

[0029] Figure 7 This is a schematic diagram of the rotating unit in a crawler according to the present invention.

[0030] Figure 8 This is a schematic diagram of the structure of a crawler of the present invention when the folding frame is unfolded.

[0031] Figure 9 This is a schematic diagram of another installation method for the rear wheel assembly in a crawler according to this utility model.

[0032] In the diagram, 1. Frame; 2. Folding frame; 3. Rear wheel assembly; 31. Rear wheel; 32. Upper shell; 33. Lower shell; 4. Axle; 5. Front wheel; 6. Elastic band; 7. Rotating unit; 71. Turntable; 72. Ring; 73. Limiting block; 8. Grip assembly; 81. Grip; 82. Brake unit; 821. Brake plate; 822. Brake lever; 823. Brake; 83. Lifting rod; 84. Snap-fit ​​unit; 841. Snap-fit ​​block; 842. Support spring; 843. Pulling block; 9. Mounting slot; 10. Groove; 11. Right-angle notch; 12. Storage slot; 13. Track slot; 14. Slide groove; 15. Compression spring; 16. Round hole; 17. Snap-fit ​​slot; 18. Square groove; 19. Arc groove; 20. Extension frame; 21. Round groove; 22. Threaded sleeve. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Example:

[0035] Reference Figure 1 - Figure 9 The present invention discloses a crawler, including a frame 1, an axle 4 inserted at the front end of the frame 1, front wheels 5 connected to both ends of the axle 4, and an elastic band 6 connected to the bottom of the frame 1.

[0036] The folding frame 2 is rotatably connected to the frame 1 near the front wheel 5, and a rotating unit 7 is provided at the connection point. The front end of the folding frame 2 is connected to a grip kit 8 for controlling the front wheel 5, and the rear end of the folding frame 2 is provided with multiple mounting slots 9 spaced apart.

[0037] The folding frame (2) has a folding station that rotates toward the rear end of the frame and an unfolding station that rotates away from the rear end of the frame during the rotation process. When unfolding, the angle between the folding frame and the frame is 60°~120°.

[0038] The rear wheel assembly 3 is connected to the rear end of the folding frame 2. The rear wheel assembly 3 includes a rear wheel 31, an upper housing 32, and a lower housing 33. The upper housing 32 and the lower housing 33 are respectively located at the top and bottom of the mounting groove 9. The upper housing 32 and the lower housing 33 are provided with grooves 10 on opposite sides, so that when the upper housing 32 and the lower housing 33 are spliced, the two grooves 10 form an installation space for clamping the pipe. The rear wheel 31 is rotatably connected to the bottom of the lower housing 33.

[0039] In this embodiment, observation Figure 1 It can be observed that an axle 4 is inserted into the front end of the frame 1, and front wheels 5 are connected to both ends of the axle 4. An elastic band 6 is connected to the bottom of the frame 1. A folding frame 2 is rotatably connected to the front end of the frame 1 near the front wheels 5, allowing the crawler to move as if... Figure 8 The status indicates that it is open. At this time, the user can place purchased items, travel gear, or groceries bought from the market on the frame 1. The folding frame 2 and elastic band 6 provide support for the items. Then, by lifting the rear end of the frame 1, the crawler can be easily pulled forward to achieve the effect of carrying items.

[0040] When exercise is needed, Figure 3It can be seen that the front end of the folding frame 2 is connected to a grip kit 8 for controlling the front wheel 5. The rear end of the folding frame 2 is provided with multiple mounting slots 9 at intervals. The mounting slots 9 are connected to the rear wheel kit 3. The rear wheel kit 3 includes a rear wheel 31, an upper shell 32 and a lower shell 33. The upper shell 32 and the lower shell 33 are respectively set at the top and bottom of the mounting slots 9. The upper shell 32 and the lower shell 33 are respectively provided with grooves 10 on the opposite side. When the upper shell 32 and the lower shell 33 are spliced, the two grooves 10 form an installation space for clamping the pipe. The rear wheel 31 is rotatably connected to the bottom of the lower shell 33. When the crawler is exercising, by lowering the folding frame 2, the rear wheel 31 at the rear end of the folding frame 2 contacts the ground, so that the rear wheel 31 and the front wheel 5 cooperate to form multi-point support. At this time, when the crawler is in use, you only need to hold the grip kit 8 to push the crawler to move. Because of the short arms and long legs, the user's torso is in an inclined position when using the crawler, which allows the user to move forward in a crawling posture. This makes the crawler an auxiliary device in crawling exercises and also avoids the situation where a person cannot carry a small cart while crawling.

[0041] Because the frame 1 and the folding frame 2 are rotatably connected, the frame 1 will fall during crawling exercises, causing it to rub against the ground and affecting the use of the crawler. Therefore, further integration is necessary. Figure 1 and Figure 7 It can be observed that a rotating unit 7 is provided at the connection position between the folding frame 2 and the frame 1. The rotating unit 7 includes a turntable 71 and a collar 72. The collar 72 is fixedly connected to the frame 1. The turntable 71 is rotatably connected to the side of the collar 72 away from the frame 1. A limit block 73 is fixedly connected to the side of the turntable 71 away from the front wheel 5. A right-angle notch 11 for the movement of the limit block 73 is provided on the outer wall of the collar 72. At this time, it is only necessary to fill the space between the collar 72 and the turntable 71 with damping oil to ensure that the folding frame 2 has sufficient support strength when it is opened to improve the stability of cargo transportation. Figure 2 As can be seen, the frame 1 has a hollow inner cavity with a circular groove 21, which reduces the overall weight of the frame 1 and allows the damping force to easily resist the weight of the frame 1. This allows the damping force to prevent the frame 1 from opening when the folding frame 2 is closed.

[0042] As another way of using it, in order to ensure the positioning stability of the frame 1 and the folding frame 2, objects such as clips or shims can be set at the opening and closing position of the right angle notch 11 to reduce the width of the right angle notch 11, or the width of the opening and closing position of the right angle notch 11 can be reduced directly so that when the limiting block 73 moves to the opening and closing position, the limiting block 73 will be locked due to the reduction in width.

[0043] In a further preferred embodiment of this utility model, such as Figure 3 - Figure 5As shown, the grip kit 8 includes a grip 81, a brake unit 82, a lifting rod 83, and a snap-fit ​​unit 84. The left and right edges of the front end of the folding frame 2 are provided with storage slots 12. The side walls of the storage slots 12 are provided with track grooves 13 along the length of the storage slots 12. Two lifting rods 83 are provided in the storage slots 12. The bottom end of one lifting rod 83 is rotatably connected to one end of the storage slot 12, and the bottom end of the other lifting rod 83 is connected to the track groove 13 through the snap-fit ​​unit 84. The two lifting rods 83 cross to form a scissor lifting mechanism. The top ends of the two lifting rods 83 are connected to the grip 81. The grip 81 is connected to the front wheel 5 through the brake unit 82.

[0044] The braking unit 82 includes a brake plate 821, a brake lever 822, and a brake 823. The brake 823 is fixedly connected to the side wall of the front wheel 5. Both ends of the handle 81 are fixedly connected to the brake plate 821. A groove 14 is provided on the opposite side of the two brake plates 821. The brake lever 822 is slidably arranged in the groove 14. One end of the brake lever 822 is connected to the brake 823 through a brake cable. The side of the brake lever 822 near the handle 81 is connected to the groove 14 through a compression spring 15.

[0045] The latching unit 84 includes a latching block 841, a support spring 842, and a lever 843. The end of the lifting rod 83 is provided with a circular hole 16. The latching blocks 841 are slidably disposed at both openings of the circular hole 16. The two ends of the track groove 13 are provided with latching grooves 17 for latching the latching blocks 841. The support spring 842 is fixedly connected between the two latching blocks 841. The lever 843 is fixedly connected to the outer wall of the two latching blocks 841. The outer wall of the lifting rod 83 is provided with a square groove 18 for sliding the lever 843.

[0046] In this embodiment, the grip assembly 8 mainly consists of a grip 81, a brake unit 82, a lifting rod 83, and a snap-fit ​​unit 84. Storage slots 12 are provided on both the left and right edges of the front end of the folding frame 2. Track grooves 13 are provided along the length of the storage slots 12 on their sidewalls. Two lifting rods 83 are installed within the storage slots 12. The bottom end of one lifting rod 83 is rotatably connected to one end of the storage slot 12, and the bottom end of the other lifting rod 83 is connected to the track groove 13 via the snap-fit ​​unit 84. The two lifting rods 83 intersect to form a scissor-type lifting mechanism. The top ends of the two lifting rods 83 are connected to the grip 81. The lifting and lowering of the grip 81 can be controlled by the two lifting rods 83, allowing the crawler to move freely during use. Figure 3 The status indicates that the handle 81 is open, making the crawler easier and more convenient to operate.

[0047] Because the front wheel 5 and the rear wheel 31 rotate relatively flexibly, they cannot stop rotating immediately when the crawling exercise ends. This prevents the user from using the crawler for leverage when standing up, causing the crawler to move forward again as soon as the legs exert force, thus affecting the use of the crawler. The handle 81 is connected to the front wheel 5 via the brake unit 82. The brake unit 82 mainly consists of a brake plate 821, a brake lever 822, and a brake 823. The brake 823 is fixedly connected to the side wall of the front wheel 5. Both ends of the handle 81 are fixedly connected to the brake plate 821. A groove 14 is provided on the opposite side of each of the two brake plates 821. The brake lever 822 is slidably installed in the groove 14. One end of the brake lever 822 is connected to the brake 823 via a brake cable. The side of the brake lever 822 closest to the handle 81 is connected to the groove 14 via a compression spring 15. When braking is needed, the user pinches the brake lever 822 with their fingers and uses their fingers to move the brake lever 822. This moves the brake lever 822, thereby controlling the brake 823 via the brake cable to stop the front wheel 5, achieving the limiting effect of the front wheel 5. When the user wants to get up, they can adjust their body posture by using their legs, thus achieving the effect of getting up on the spot, making the crawler more convenient to use.

[0048] Subsequently, after the finger is released, the compression spring 15 will push the brake lever 822 to return to its original position, causing the brake lever 822 to release the force on the brake cable, thereby releasing the brake 823, unlocking the front wheel 5, and allowing the crawler to resume movement.

[0049] Because the grip 81 is positioned via the lifting rod 83, it is convenient for users to grip the grip 81 when using the crawler. Therefore, combined with Figure 4 and Figure 5 It can be seen that by making the snap-fit ​​unit 84 include snap-fit ​​blocks 841, support springs 842 and lever blocks 843, the end of the lifting rod 83 is provided with a round hole 16, and snap-fit ​​blocks 841 are slidably arranged at both opening positions of the round hole 16. Both ends of the track groove 13 are provided with snap-fit ​​grooves 17 for snapping the snap-fit ​​blocks 841. The support spring 842 is fixedly connected between the two snap-fit ​​blocks 841. Lever blocks 843 are fixedly connected to the outer walls of the two snap-fit ​​blocks 841. The outer wall of the lifting rod 83 is provided with a square groove 18 for sliding the lever blocks 843.

[0050] When using the crawler, pinch the lever 843 with your fingers to disengage the locking block 841 from the slot 17. Then, lift the handle 81 to unfold the handle kit 8. Once fully unfolded, the locking block 841 will insert into the slot 17 at the other end of the track groove 13, providing support for the lifting rod 83 and ensuring the stability of the handle 81. When it is time to store the crawler, pinch the lever 843 with your fingers to disengage the locking block 841 from the slot 17 to unlock the lifting rod 83. Then, press down on the handle 81 to reset the lifting rod 83, thus storing the handle kit 8. This makes using the crawler even simpler.

[0051] In a further preferred embodiment of this utility model, such as Figure 3 As shown, the front side of the brake handle 822 is provided with a plurality of arc-shaped grooves 19 for placing fingers, and the edges of the arc-shaped grooves 19 are rounded.

[0052] In this embodiment, since the crawler needs to hold the brake lever 822 with its fingers when braking, in order to improve the grip comfort of the brake lever 822 and thus improve the overall comfort of using the crawler, observation was conducted. Figure 3 It can be seen that multiple arc-shaped grooves 19 are spaced apart on the front side of the brake lever 822, and the edges of the arc-shaped grooves 19 are rounded, which can effectively increase the contact area between the fingers and the brake lever 822, thereby reducing the pressure on the fingers and improving comfort.

[0053] In a further preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, it also includes an extension frame 20, which is C-shaped. The rear left and right sides of the frame 1 are provided with circular grooves 21. The opening of the circular grooves 21 is rotatably connected to a threaded sleeve 22. The end of the extension frame 20 is threadedly connected to the threaded sleeve 22.

[0054] In this embodiment, since the crawler needs to act as a folding trolley to transport goods during non-exercise periods, when there are many goods, the crawler may not be able to carry them all, affecting the efficiency of goods handling. Therefore, observation Figure 1 and Figure 2 It can be observed that the crawler also includes an extension frame 20, which is C-shaped. Circular grooves 21 are provided on both the left and right rear sides of the frame 1. Threaded sleeves 22 are rotatably connected to the openings of the circular grooves 21. The ends of the extension frame 20 are threadedly connected to the threaded sleeves 22. The loading capacity of the crawler can be increased by adjusting the length of the extension frame 20, effectively improving the crawler's practicality.

[0055] In a further preferred embodiment of this utility model, such as Figure 1 As shown, the diameter of the front wheel 5 is larger than the diameter of the rear wheel 31, causing the frame 1 to be tilted with the front higher than the rear.

[0056] In this embodiment, due to the short arms and long legs, the user's torso is tilted when using the crawler, and the arched posture shifts the center of gravity too far forward, affecting the user's balance during crawling exercise. Therefore, Figure 1 It can be seen that the diameter of the front wheel 5 is larger than that of the rear wheel 31, making the crawler tilted with the front higher than the rear. When the user grips the front of the crawler, the crawler can elevate the user's forelimbs, adjusting the user's center of gravity during crawling exercise, thus making crawling exercise easier.

[0057] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A crawler, characterized in that, The frame (1) includes a rear end for pulling by hand. The front end of the frame (1) is rotatably equipped with two front wheels (5) spaced apart to the left and right. The front end of the frame is also rotatably equipped with a folding frame (2). The rotation axis of the folding frame (2) extends in the left and right direction. During rotation, the folding frame (2) has a folding position that rotates toward the rear end of the frame and an unfolding position that rotates away from the rear end of the frame. At least one rear wheel (31) is provided on the frame and / or the folding frame. The rear wheel (31) is located behind the front wheel (5). The front end of the folding frame or the frame is provided with a grip kit (8) for the user to hold when crawling. The grip kit (8) includes a grip (81) and a brake unit (82) for braking control of the front wheel (5).

2. The crawler according to claim 1, characterized in that: The front end of the frame (1) is fitted with an axle (4), the front wheel (5) is connected to both ends of the axle (4), and the bottom of the frame (1) is connected with an elastic band (6). The folding frame (2) is rotatably connected to the frame (1) near the front wheel (5) and a rotating unit (7) is provided at the connection. The front end of the folding frame (2) is connected to a grip kit (8) for controlling the front wheel (5), and the rear end of the folding frame (2) is provided with multiple mounting slots (9) spaced apart. The rear wheel assembly (3) is connected to the rear end of the folding frame (2). The rear wheel assembly (3) includes a rear wheel (31), an upper housing (32) and a lower housing (33). The upper housing (32) and the lower housing (33) are respectively located at the top and bottom of the mounting groove (9). The upper housing (32) and the lower housing (33) are respectively provided with grooves (10) on opposite sides. When the upper housing (32) and the lower housing (33) are spliced, the two grooves (10) form an installation space for clamping the pipe. The rear wheel (31) is rotatably connected to the bottom of the lower housing (33).

3. A crawler according to claim 2, characterized in that, The rotating unit (7) includes a turntable (71) and a collar (72). The collar (72) is fixedly connected to the frame (1). The turntable (71) is rotatably connected to the side of the collar (72) away from the frame (1). A limiting block (73) is fixedly connected to the side of the turntable (71) away from the front wheel (5). A right-angle notch (11) for the movement of the limiting block (73) is provided on the outer wall of the collar (72).

4. A crawler according to claim 3, characterized in that, The grip kit (8) includes a grip (81), a brake unit (82), a lifting rod (83), and a snap-fit ​​unit (84). The left and right edges of the front end of the folding frame (2) are provided with storage slots (12). The side wall of the storage slot (12) is provided with a track groove (13) along the length of the storage slot (12). Two lifting rods (83) are provided in the storage slot (12). The bottom end of one lifting rod (83) is rotatably connected to one end of the storage slot (12), and the bottom end of the other lifting rod (83) is connected to the track groove (13) through the snap-fit ​​unit (84). The two lifting rods (83) cross to form a scissor lifting mechanism. The top ends of the two lifting rods (83) are connected to the grip (81). The grip (81) is connected to the front wheel (5) through the brake unit (82).

5. A crawler according to claim 4, characterized in that, The braking unit (82) includes a brake plate (821), a brake lever (822) and a brake (823). The brake (823) is fixedly connected to the side wall of the front wheel (5). Both ends of the handle (81) are fixedly connected to the brake plate (821). A groove (14) is provided on the opposite side of the two brake plates (821). The brake lever (822) is slidably arranged in the groove (14). One end of the brake lever (822) is connected to the brake (823) through a brake cable. The side of the brake lever (822) near the handle (81) is connected to the groove (14) through a compression spring (15).

6. A crawler according to claim 5, characterized in that, The latching unit (84) includes a latching block (841), a support spring (842), and a lever (843). The end of the lifting rod (83) is provided with a round hole (16). The two openings of the round hole (16) are slidably provided with latching blocks (841). Both ends of the track groove (13) are provided with latching grooves (17) for latching the latching blocks (841). The support spring (842) is fixedly connected between the two latching blocks (841). The outer walls of the two latching blocks (841) are fixedly connected with levers (843). The outer wall of the lifting rod (83) is provided with a square groove (18) for sliding the levers (843).

7. A crawler according to claim 6, characterized in that, The front side of the brake lever (822) is provided with a plurality of arc-shaped grooves (19) for placing fingers, and the edges of the arc-shaped grooves (19) are rounded.

8. A crawler according to claim 7, characterized in that, It also includes an extension frame (20), which is C-shaped. The rear left and right sides of the frame (1) are provided with round grooves (21). The opening of the round groove (21) is rotatably connected to a threaded sleeve (22). The end of the extension frame (20) is threadedly connected to the threaded sleeve (22).

9. A crawler according to claim 8, characterized in that, The diameter of the front wheel (5) is larger than the diameter of the rear wheel (31), so that the frame (1) is tilted with the front higher than the rear.

10. A crawler according to claim 1, characterized in that: When the workstation is unfolded, the angle between the folding frame and the vehicle frame is 60°~120°.

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