Single-arm dolly

Abstract

The utility model provides a single -armed drag frame, including car head, adjustable connecting mechanism and wheelchair connecting mechanism, adjustable connecting mechanism connects between car head and wheelchair connecting mechanism, and wheelchair connecting mechanism connects on the wheelchair, and wheelchair connecting mechanism includes cross bar, left clamp, right clamp, left one word handle screw, right one word handle screw, left telescopic link, right telescopic link and joint rotary joint, and the both ends of cross bar are connected left telescopic link and right telescopic link respectively to adjust width, the left end of left telescopic link is connected left clamp, and the right end of right telescopic link is connected right clamp, when connecting, left clamp and right clamp are clamped on the pipe fitting of wheelchair and are locked with one word handle screw, realize and wheelchair quick dismounting. Adjustable connecting mechanism sets up first connecting pipe and second connecting pipe two sections, and the both sides are detachably connected through first quick -release block and second quick -release block, and angle and height adjustment are realized through first adjusting block and second adjusting block, simplify the structure, and dismounting is more convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair traction technology, and in particular to a single-arm tow frame. Background Technology

[0002] Combination wheelchairs that use a traction mechanism in conjunction with a regular wheelchair are gradually gaining popularity among users due to their higher cost-effectiveness. Among them, the traction mechanism is a key component, which enables the connection with the regular wheelchair and provides traction power to the wheelchair. For example, the utility model patents with authorization announcement numbers CN 215821442 U and CN 216496127 U both involve towing heads for traction. The towing heads disclosed in the above structures have the following problems: (1) The connection structure with the wheelchair is relatively complex. The connection with the wheelchair is achieved through two adjustable connecting plates and several screws. The installation and disassembly of this structure require tightening multiple screws, which is quite time-consuming; (2) The angle adjustment is all combined with an electric push cylinder, which increases the cost on the one hand and the overall weight of the towing head on the other hand, making it inconvenient to disassemble and assemble.

[0003] In view of this, it is necessary to improve the existing tractor structure to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a single-arm trailer.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a single-arm trailer, including a front end, an adjustable connecting mechanism, and a wheelchair connecting mechanism, wherein the adjustable connecting mechanism is connected between the front end and the wheelchair connecting mechanism, and the wheelchair connecting mechanism is connected to a wheelchair. The wheelchair connection mechanism includes a crossbar, a left clamp, a right clamp, a left flathead screw, a right flathead screw, a left telescopic rod, a right telescopic rod, and a joint swivel joint. The crossbar has a left U-shaped groove and a right U-shaped groove at both ends. The left telescopic rod is telescopically connected to the left U-shaped groove, and the right telescopic rod is telescopically connected to the right U-shaped groove. The left end of the left telescopic rod is connected to the left clamp, and the left flathead screw is located on the left clamp. The right end of the right telescopic rod is connected to the right clamp, and the right flathead screw is located on the right clamp. During connection, the left clamp clamps onto the tube on the left side of the wheelchair and is locked with the left flathead screw. The right clamp clamps onto the tube on the right side of the wheelchair and is locked with the right flathead screw. One end of the joint swivel joint is connected to the crossbar, and the other end is connected to the second connecting tube of the adjustable connection mechanism.

[0006] The wheelchair connection mechanism has been improved, replacing the original structure with multiple screws with a clamp structure. When connecting, simply clamp the fitting on the wheelchair with the clamp and then tighten it with a flathead screw. The connection and disassembly are quick and convenient, making it more suitable for home use. The two jaws of the clamp are hinged at one end, and the opening size of the other end can be adjusted to accommodate wheelchair fittings of different thicknesses, resulting in better compatibility. Furthermore, the overall width can be adjusted via a telescopic rod to accommodate different wheelchair models.

[0007] Furthermore, the adjustable connection mechanism includes a first connecting tube, a second connecting tube, a first quick-release block, a second quick-release block, a pull rope, and a quick-release switch. The first quick-release block is fixed to one end of the first connecting tube, and the second quick-release block is fixed to one end of the second connecting tube. The other end of the second connecting tube is connected to a joint rotary joint. The upper end of the first quick-release block is provided with a slot, and a telescopic hook is provided in the first quick-release block below the slot. A spring is provided between the first quick-release block and the telescopic hook. The telescopic hook can be extended or retracted by the spring and the tension. The end of the telescopic hook located in the first quick-release block is connected to the quick-release switch through the pull rope. The quick-release switch is installed on the handle for easy operation. The second quick-release block is provided with an upper horizontal post and a lower horizontal post that are parallel to each other. When connected, the upper horizontal post is embedded in the slot, and the telescopic hook is hooked on the lower horizontal post. When disassembled, the quick-release switch is pressed, and the telescopic hook is pulled by the pull rope to disengage the telescopic hook from the lower horizontal post.

[0008] Furthermore, to achieve angle and height adjustment, the adjustable connection mechanism also includes a first adjusting block, a second adjusting block, and an adjusting handle. The first adjusting block is fixedly connected to the end of the first connecting tube away from the first adjusting block. The upper end of the first adjusting block is provided with a first ear plate. The second adjusting block is provided with a second ear plate that is complementary to the first ear plate. The opposite sides of the first ear plate and the second ear plate are respectively provided with a first toothed surface and a second toothed surface, which mesh with each other. The shaft of the adjusting handle passes through the first ear plate and the second ear plate laterally and is threadedly connected to the first ear plate. By rotating the adjusting handle, the first ear plate and the second ear plate can be locked and loosened. When loosened, the angle of the first connecting tube can be rotated. When the angle is adjusted, the first ear plate and the second ear plate are pressed together, and the first toothed surface and the second toothed surface mesh to prevent mutual rotation and ensure the stability of the angle. Finally, the first ear plate and the second ear plate are locked by rotating the handle.

[0009] Furthermore, in order to ensure smooth rotation of the first ear plate and the second ear plate, a first arc-shaped surface is provided on the first adjusting block at the position opposite to the second ear plate, and a second arc-shaped surface is provided on the second adjusting block at the position opposite to the first ear plate.

[0010] To achieve height adjustment, the second adjusting block has multiple first height adjustment holes on the side away from the second ear plate. The outer riser of the vehicle head has two parallel guide strips, each with multiple second height adjustment holes along its length. The first and second height adjustment holes are compatible. During connection, the second adjusting block with the first height adjustment holes is positioned between the guide strips. Screws are inserted through the first and second height adjustment holes to lock and fix the first adjusting block to the outer riser. Height adjustment can be achieved by adjusting the connection position between the second adjusting block and the outer riser.

[0011] Furthermore, the front of the vehicle includes a handlebar, an outer stem, an inner stem, a fork, and a wheel. The inner stem passes through the outer stem, with its upper end connected to a handlebar for gripping and its lower end connected to the fork. The end of the fork is connected to the wheel, and a mudguard is provided above the wheel, connected to the top of the fork slot. The inner stem can rotate coaxially with the outer stem within the outer stem. A battery bracket is provided on the front side of the outer stem, and a battery for providing power to the electric lifting mechanism is fixed on the battery bracket. The outer stem is generally flat and cylindrical, with a protective end cap at the upper end.

[0012] Furthermore, to facilitate placement after the tractor unit is disassembled, a support frame assembly is included. This assembly comprises a connecting sleeve, a T-shaped support rod, and small wheels. The connecting sleeve is hollow, with its upper end fixedly connected to the outer riser. The upper end of the T-shaped support rod is inserted into the connecting sleeve from its lower end and secured by screws on its side. Small wheels are installed at both ends of the lower part of the T-shaped support rod. The T-shaped support rod includes a horizontal bar and a vertical bar. Small wheels are connected to both ends of the horizontal bar. One end of the vertical bar is connected to the middle of the horizontal bar, and the other end is inserted into the connecting sleeve. The lower part of the vertical bar has a bend angle for easy connection to the horizontal bar.

[0013] The beneficial effects of this utility model are: the single-arm tow bracket provided by this utility model has improved both the adjustable connection mechanism and the wheelchair connection mechanism, simplified the structure, reduced the cost, and made disassembly and assembly more convenient and quick, and easier to use. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a three-dimensional structural diagram of the single-arm trailer of this utility model.

[0016] Figure 2 This is a side view of the single-arm trailer of this utility model.

[0017] Figure 3 This is a structural diagram of the first quick-release block.

[0018] Figure 4 This is a schematic diagram of the second quick-release block.

[0019] Figure 5 This is a schematic diagram of the structure at the connection between the first and second adjusting blocks.

[0020] Figure 6 This is a schematic diagram of the structure of the first adjusting block.

[0021] Figure 7 This is a schematic diagram of the second adjusting block.

[0022] Figure 8 This is a schematic diagram of the wheelchair connection mechanism.

[0023] Figure 9 This is a structural diagram of the support leg assembly.

[0024] In the diagram: 1. Front end, 1.1. Handlebar, 1.2. Inner riser, 1.3. Outer riser, 1.31. Second height adjustment hole, 1.32. Guide bar, 1.4. Front fork, 1.5. Wheel, 1.6. Mudguard, 1.7. Battery bracket, 1.8. End cap; 2. Adjustable connecting mechanism, 2.1. First connecting tube, 2.2. Second connecting tube, 2.3. First adjusting block, 2.31. First ear plate, 2.32. First arc-shaped surface, 2.33. First toothed surface, 2.4. Second adjusting block, 2.41. Second ear plate, 2.42. Second arc-shaped surface, 2.43. Second toothed surface, 2.44. First height adjustment hole. 2.5 Adjustment hole, 2.6 Adjustment handle, 2.7 First quick release block, 2.61 Slot, 2.7 Second quick release block, 2.71 Upper crossbar, 2.72 Lower crossbar, 2.8 Telescopic hook; 3. Wheelchair connecting mechanism, 3.1 Crossbar, 3.2 Left clamp, 3.3 Right clamp, 3.4 Left telescopic rod, 3.5 Right telescopic rod, 3.6 Joint swivel joint, 3.7 Left flathead handle screw, 3.8 Right flathead handle screw; 4. Support leg assembly, 4.1 Connecting sleeve, 4.2 Vertical rod, 4.3 Crossbar, 4.4 Small wheel. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 As shown, a single-arm tow rack of this utility model includes a front end 1, an adjustable connecting mechanism 2, a wheelchair connecting mechanism 3, and a support leg assembly 4. The adjustable connecting mechanism 2 is connected between the front end 1 and the wheelchair connecting mechanism 3, the wheelchair connecting mechanism 3 is connected to the wheelchair, and the support leg assembly 4 is disposed on the inner side of the front end 1 for supporting the front end 1.

[0029] like Figure 2 As shown, the front of the vehicle 1 includes a handlebar, an outer stem 1.3, an inner stem 1.2, a front fork 1.4, and a wheel 1.5. The inner stem 1.2 passes through the outer stem 1.3, its upper end connected to a handlebar 1.1 for gripping, and its lower end connected to the front fork 1.4. The end of the front fork 1.4 is connected to the wheel 1.5, and a mudguard 1.6 is provided above the wheel 1.5, connected to the top of the groove in the front fork 1.4. The inner stem 1.2 can rotate coaxially with respect to the outer stem 1.3 within the outer stem 1.3. A battery bracket 1.7 is provided on the front side of the outer stem 1.3, and a battery for providing power to the electric lifting mechanism is fixed on the battery bracket 1.7. The outer stem 1.3 is generally flat and cylindrical, with a protective end cap 1.8 at the upper end. The improvement of the front of the vehicle 1 in this embodiment compared to the original structure lies mainly in the shape and structure of the outer stem 1.3.

[0030] like Figures 2-4As shown, the adjustable connecting mechanism 2 includes a first connecting tube 2.1, a second connecting tube 2.2, a first quick-release block 2.6, a second quick-release block 2.7, a pull rope, and a quick-release switch. The first quick-release block 2.6 is fixedly connected to one end of the first connecting tube 2.1, and the second quick-release block 2.7 is fixedly connected to one end of the second connecting tube 2.2. The other end of the second connecting tube 2.2 is connected to the joint rotary joint 3.6. The upper end of the first quick-release block 2.6 is provided with a slot 2.61, and a telescopic hook 2.8 is provided inside the first quick-release block 2.6 below the slot 2.61. The first quick-release block 2.6 and the telescopic hook 2.8 are connected... A spring is provided, and the telescopic hook 2.8 is telescopically extended or retracted through the cooperation of the spring and the tension. One end of the telescopic hook 2.8 located in the first quick-release block 2.6 is connected to a quick-release switch via a pull rope. The quick-release switch is installed on the handle 1.1 for easy operation. The second quick-release block 2.7 has an upper horizontal post 2.71 and a lower horizontal post 2.72 that are parallel to each other. When connected, the upper horizontal post 2.71 is embedded in the slot 2.61, and the telescopic hook 2.8 is hooked on the lower horizontal post 2.72. When disassembling, the quick-release switch is pressed, and the telescopic hook 2.8 is pulled by the pull rope, so that the telescopic hook 2.8 is disengaged from the lower horizontal post 2.72.

[0031] like Figures 5-7As shown, the adjustable connecting mechanism 2 further includes a first adjusting block 2.3, a second adjusting block 2.4, and an adjusting handle 2.5. The first adjusting block 2.3 is fixedly connected to the end of the first connecting tube 2.1 away from the first adjusting block 2.3. The upper end of the first adjusting block 2.3 is provided with a first ear plate 2.31. The second adjusting block 2.4 is provided with a second ear plate 2.41 that is complementary to the first ear plate 2.31. The sides of the first ear plate 2.31 and the second ear plate 2.41 opposite to each other are respectively provided with a first toothed surface 2.33 and a second toothed surface 2.43, which mesh with each other. The shaft of the adjusting handle 2.5 extends laterally through the first ear plate 2.31 and the second ear plate 2.41 and is threadedly connected to the first ear plate 2.31. Rotating the adjusting handle 2.5 allows for locking and unlocking of the first ear plate 2.31 and the second ear plate 2.41. When unlocked, the angle of the first connecting pipe 2.1 can be rotated. Once the angle is adjusted, the first ear plate 2.31 and the second ear plate 2.41 are brought into contact, with the first toothed surface 2.33 and the second toothed surface 2.43 meshing to prevent mutual rotation and ensure angle stability. Finally, the first ear plate 2.31 and the second ear plate 2.41 are locked by rotating the handle. To ensure smooth rotation of the first ear plate 2.31 and the second ear plate 2.41, a first arc-shaped surface 2.32 is provided on the first adjusting block 2.3 at a position opposite to the second ear plate 2.41, and a second arc-shaped surface 2.42 is provided on the second adjusting block 2.4 at a position opposite to the first ear plate 2.31. To achieve height adjustment, the second adjusting block 2.4 has multiple first height adjustment holes 2.44 on the side away from the second ear plate 2.41. The outer riser 1.3 has two parallel guide strips 1.32, each with multiple second height adjustment holes 1.31 along its length. The first height adjustment holes 2.44 and second height adjustment holes 1.31 are compatible. During connection, the position of the second adjusting block 2.4 with the first height adjustment holes 2.44 is positioned between the guide strips 1.32. The first adjusting block 2.3 is locked and fixed to the outer riser 1.3 by screws passing through the first height adjustment holes 2.44 and second height adjustment holes 1.31. The height can be adjusted by adjusting the connection position between the second adjusting block 2.4 and the outer riser 1.3.

[0032] like Figure 8As shown, the wheelchair connection mechanism 3 includes a crossbar 3.1, a left clamp 3.2, a right clamp 3.3, a left flathead handle screw 3.7, a right flathead handle screw 3.8, a left telescopic rod 3.4, a right telescopic rod 3.5, and a joint swivel joint 3.6. The crossbar 3.1 has a left U-shaped groove and a right U-shaped groove at both ends. The left telescopic rod 3.4 is telescopically connected to the left U-shaped groove, and the right telescopic rod 3.5 is telescopically connected to the right U-shaped groove. The left end of the left telescopic rod 3.4 is connected to the left clamp 3.2. The left flathead handle screw 3.7 is located at... On the left clamp 3.2, the right end of the right telescopic rod 3.5 is connected to the right clamp 3.3. The right flathead screw 3.8 is set on the right clamp 3.3. When connected, the left clamp 3.2 is clamped on the tube on the left side of the wheelchair and locked with the left flathead screw 3.7. The right clamp 3.3 is clamped on the tube on the right side of the wheelchair and locked with the right flathead screw 3.8. One end of the joint rotary joint 3.6 is connected to the crossbar 3.1, and the other end is connected to the second connecting tube 2.2 of the adjustable connecting mechanism 2.

[0033] The wheelchair connection mechanism 3 has been improved, replacing the original structure with multiple screws with a clamp structure. When connecting, simply clamp the tubing on the wheelchair with the clamp and then tighten it with a flathead screw. The connection and disassembly are quick and convenient, making it more suitable for home use. The two jaws of the clamp are hinged at one end, and the opening size at the other end can be adjusted to accommodate wheelchair tubing of different thicknesses, resulting in better compatibility. Furthermore, the overall width can be adjusted via the telescopic rod to accommodate different wheelchair models.

[0034] like Figure 9 As shown, the support assembly 4 includes a connecting sleeve 4.1, a T-shaped support rod, and small wheels 4.4. The connecting sleeve 4.1 is a hollow structure, with its upper end fixedly connected to the outer riser 1.3. The upper end of the T-shaped support rod is inserted into the connecting sleeve 4.1 from its lower end and locked in place by screws. Small wheels 4.4 are installed at both ends of the lower part of the T-shaped support rod. The T-shaped support rod includes a horizontal bar 4.3 and a vertical bar 4.2. The small wheels 4.4 are connected to both ends of the horizontal bar 4.3. One end of the vertical bar 4.2 is connected to the middle of the horizontal bar 4.3, and the other end is inserted into the connecting sleeve 4.1. The connecting sleeve 4.1 and the vertical bar 4.2 are located on the same straight line and at a certain angle to the horizontal direction for easy support.

[0035] Disassembly and assembly process: (1) Retract the left telescopic rod 3.4 and the right telescopic rod 3.5 of the wheelchair connecting mechanism 3 into the crossbar 3.1, and then place the wheelchair connecting mechanism 3 in a suitable position on the wheelchair. Adjust the length of the left telescopic rod 3.4 and the right telescopic rod 3.5 to match the width of the wheelchair. Open the left clamp 3.2 and the right clamp 3.3 to clamp the tubing of the wheelchair. Then lock the wheelchair connecting mechanism 3 onto the wheelchair using the left flat handle screw 3.7 and the right flat handle screw 3.8. Adjust the position of the crossbar again so that it is in the middle position between the screw and the left telescopic rod 3.4 and the right telescopic rod 3.5. Then lock the crossbar to the left telescopic rod 3.4 and the right telescopic rod 3.5 using the screw.

[0036] (2) Connect the second quick-release block 2.7 to the second connecting tube 2.2, and connect the other end of the second connecting tube 2.2 to the joint rotary joint 3.6.

[0037] (3) Install the first adjusting block 2.3 on the outer riser 1.3, install the first quick release block 2.6 and the first adjusting block 2.3 on the two ends of the first connecting pipe 2.1 respectively, and then use the adjusting handle 2.5 to initially fix the first adjusting block 2.3 and the second adjusting block 2.4.

[0038] (4) Drag the structure installed in step (3) to the wheelchair, connect the first quick release block 2.6 and the second quick release block 2.7, so that the upper crossbar 2.71 is embedded in the slot 2.61 and the telescopic hook 2.8 hooks the lower crossbar 2.72, thereby realizing the assembly of the trailer and the wheelchair.

[0039] (5) When disassembly is required, simply press the quick-release switch on the handle 1.1 and pull the telescopic hook 2.8 with the pull rope to disengage the telescopic hook 2.8 from the lower crossbar 2.72, so that the front of the vehicle 1 can be quickly disassembled; loosen the left flat handle screw 3.7 and the right flat handle screw 3.8 to open the left clamp 3.2 and the right clamp 3.3, so that the wheelchair connecting mechanism 3 can be removed from the wheelchair.

[0040] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A single-arm trailer, characterized in that: The device includes a front end, an adjustable connecting mechanism, and a wheelchair connecting mechanism. The adjustable connecting mechanism connects the front end and the wheelchair connecting mechanism, which is connected to the wheelchair. The wheelchair connecting mechanism includes a crossbar, a left clamp, a right clamp, a left flathead screw, a right flathead screw, a left telescopic rod, a right telescopic rod, and a joint swivel joint. The crossbar has a left U-shaped groove and a right U-shaped groove at both ends. The left telescopic rod is telescopically connected to the left U-shaped groove, and the right telescopic rod is telescopically connected to the right U-shaped groove. The left end of the left telescopic rod connects to the left clamp, and the left flathead screw is located on the left clamp. The right end of the right telescopic rod connects to the right clamp, and the right flathead screw is located on the right clamp. During connection, the left clamp clamps onto the tubing on the left side of the wheelchair and is locked with the left flathead screw. The right clamp clamps onto the tubing on the right side of the wheelchair and is locked with the right flathead screw. One end of the joint swivel joint is connected to the crossbar, and the other end is connected to the adjustable connecting mechanism.

2. The single-arm trailer as described in claim 1, characterized in that: The adjustable connection mechanism includes a first connecting tube, a second connecting tube, a first quick-release block, a second quick-release block, a pull rope, and a quick-release switch. The first quick-release block is fixed to one end of the first connecting tube, and the second quick-release block is fixed to one end of the second connecting tube. The other end of the second connecting tube is connected to a joint rotary joint. The upper end of the first quick-release block is provided with a slot, and a telescopic hook is provided in the first quick-release block below the slot. One end of the telescopic hook located in the first quick-release block is connected to the quick-release switch via a pull rope. The second quick-release block is provided with an upper horizontal post and a lower horizontal post that are parallel to each other. When connected, the upper horizontal post is embedded in the slot, and the telescopic hook is hooked on the lower horizontal post. When disassembled, the quick-release switch is pressed, and the telescopic hook is pulled by the pull rope to disengage the telescopic hook from the lower horizontal post.

3. The single-arm trailer as described in claim 2, characterized in that: The adjustable connection mechanism further includes a first adjusting block, a second adjusting block, and an adjusting handle. The first adjusting block is fixedly connected to the end of the first connecting tube away from the first adjusting block. The upper end of the first adjusting block is provided with a first ear plate. The second adjusting block is provided with a second ear plate that is complementary to the first ear plate. The opposing sides of the first ear plate and the second ear plate are respectively provided with a first toothed surface and a second toothed surface. The first toothed surface and the second toothed surface mesh with each other. The shaft portion of the adjusting handle passes laterally through the first ear plate and the second ear plate and is threadedly connected to the first ear plate.

4. The single-arm trailer as described in claim 3, characterized in that: The first adjusting block has a first arc-shaped surface at a position opposite to the second ear plate, and the second adjusting block has a second arc-shaped surface at a position opposite to the first ear plate.

5. The single-arm trailer as described in claim 3, characterized in that: The second adjusting block has multiple first height adjustment holes on the side away from the second ear plate. The outer riser of the vehicle head has two parallel guide strips. The guide strips have multiple second height adjustment holes along their length. The first height adjustment holes and the second height adjustment holes are compatible. When connected, the position of the second adjusting block with the first height adjustment hole is placed between the guide strips. The second adjusting block and the outer riser are locked and fixed by screws passing through the first height adjustment holes and the second height adjustment holes.

6. The single-arm trailer as described in claim 1, characterized in that: The vehicle head includes handlebars, an outer stem, an inner stem, a front fork, and a wheel. The inner stem passes through the outer stem, with its upper end connected to a handlebar for gripping and its lower end connected to the front fork. The end of the front fork is connected to the wheel, and a mudguard is provided above the wheel, connected to the top of the front fork slot. The inner stem can rotate coaxially with the outer stem within the outer stem. A battery bracket is provided on the front side of the outer stem. The outer stem is generally flat and cylindrical, with a protective end cap at its upper end.

7. The single-arm trailer as described in any one of claims 1-6, characterized in that: It also includes a support frame assembly, which includes a connecting sleeve, a T-shaped support rod, and small wheels. The connecting sleeve is a hollow structure, with its upper end fixedly connected to the outer riser. The upper end of the T-shaped support rod is inserted into the connecting sleeve from the lower end and locked on the side by screws. Small wheels are installed at both ends of the lower part of the T-shaped support rod.

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