Swing car with rear universal wheels and turnover backrest

Abstract

The invention discloses a swing car with rear universal wheels and an overturning backrest, a seat surface of a swing car body is composed of a fixed part and a movable part, when the backrest is used, the movable part is opened in place through overturning and is locked with the fixed part in a matched mode to form a fixed backrest of the swing car, and the fixed backrest is fixed on the swing car body. The back face of the fixed backrest is detachably provided with a fence connecting assembly, the front half portion of the seat face is detachably connected with a supporting rod, and the two ends of the two semi-fences are assembled with the matched portion of the fence connecting assembly and the supporting rod to form a closed fence. After the semi-fences and the supporting rods are detached, the movable part of the seat surface is unlocked, turned over and closed; wheels installed on the rear portion of the swing car body are universal wheels with one-key locking and unlocking functions. According to the swing car, reliable support can be provided for the back of a child, and meanwhile the problems that parents pull and guide the car when the child sits on the swing car and the safety is poor when a child of a small age sits on the swing car can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of children's toy vehicles, in particular to a twist car with rear-mounted universal wheels and a flip-backrest. BACKGROUND

[0002] The twist car, also known as a rocking car, is a cleverly structured, flexible and interesting children's toy. It does not require a power source such as a battery or a motor, nor does it need to be pushed by a person or slid on the ground with both feet. All it needs is for the child to constantly turn the steering wheel left and right, and the twist car will move forward.

[0003] Currently, twist cars with backrests can be broadly divided into the following three categories. The first category is a fixed backrest, which is designed in one piece with the seat and is usually an integral structure formed by injection molding or blow molding. The backrest is an extension of the rear of the seat, and this type of backrest cannot be detached or adjusted. The second category is a foldable / detachable backrest, which is connected to the vehicle body by hinges, buckles or quick-release structures and can be folded to the side of the vehicle body or completely detached. The third category is an adjustable-angle backrest, which uses an adjustable joint (such as a rotating shaft + locking device) between the backrest and the vehicle body, allowing users to adjust the inclination angle of the backrest (such as 90°, 100°, 110°, etc.) according to their needs.

[0004] The mounting position of the backrest of the above-mentioned three types of twist cars is usually rearward, and the backrest cannot provide effective support for younger children when they are riding, which does not match the child's center of gravity, resulting in the child leaning forward or unstable center of gravity when leaning.

[0005] Secondly, there are three problems with the design of the twist car's guardrail. First, the existing twist car's guardrail or enclosure is generally low in height (such as only to the child's waist or lower), which does not effectively block the child who is active or trying to stand up. Second, some guardrails or enclosures are only provided at the rear or one side of the seat, and do not form a complete enclosure structure, so children can easily fall out from the side or front. Third, most guardrails or enclosures are fixed structures, which are not convenient for the conversion of the twist car's usage state, and the detachable structure of the guardrail or enclosure is complex, making assembly and disassembly cumbersome and the manufacturing cost high.

[0006] In addition, the rear wheel set of the current twist car is a directional roller, and when the parent needs to pull the twist car, the vehicle is not easy to move in the pulling direction. SUMMARY

[0007] Therefore, the present application provides a twist car with rear-mounted universal wheels and a flip-backrest, which can effectively overcome the defect that the existing twist car's backrest is too far back and cannot provide effective support for children, and can also solve the problem of the parent's pulling and guiding the twist car when the child is riding on it, as well as the safety problem of younger children when riding.

[0008] A scooter with rear caster wheels and a flip backrest, the seat surface of the scooter body is composed of a fixed part and a movable part, when the backrest is needed, the movable part is separated from the fixed part by flipping or disassembling, and is opened, after being opened to the right position and locked with the fixed part, a fixed backrest of the scooter is formed, the back of the fixed backrest is detachably installed with a fence connecting assembly, the front half of the seat surface is detachably connected with a support rod, and two half fences are assembled with the fence connecting assembly and the matching part of the support rod at two ends respectively to form a closed fence; after the half fences and the support rod are disassembled, the movable part of the seat surface is unlocked and flipped to be closed, and the movable part of the seat surface and the fixed part form a complete seat surface of the scooter; the wheels installed at the rear of the scooter body are caster wheels with one-key locking and unlocking functions.

[0009] Further, the scooter body comprises an upper body, a lower body, a cover backrest, a locking screw and an unlocking button; The middle part of one end of the cover backrest is provided with an unlocking button, and the left and right sides of the other end extend out a plug rod structure in the horizontal direction, and a waist-shaped hole is processed on the plug rod structure; The locking screw passes through the waist-shaped hole on the plug rod structure of the cover backrest, and the cover backrest and the upper body are movably connected together, and the cover backrest is locked and unlocked with the lower body through the unlocking button; The middle part of the lower body is provided with a limiting groove, when the cover backrest is flipped counterclockwise to a set angle and is lifted up, the cover backrest is inserted into the limiting groove of the lower body to form a fixed backrest, when the cover backrest needs to be lowered, the cover backrest is lifted up along the direction of the limiting groove, and then the cover backrest is flipped clockwise until the cover backrest is attached to the lower body, and the cover backrest is locked with the lower body through the unlocking button.

[0010] Further, the left side of the upper half of the unlocking button is provided with a compression spring mounting cavity, the right side of the upper half is an inner concave pressing part, the lower half of the unlocking button is a downward extending hook, and a convex edge extends out from the bottom of the hook in the horizontal direction; The compression spring is mounted in the compression spring mounting cavity of the unlocking button, and the hook of the lower half of the unlocking button passes through the through hole of the mounting block, the unlocking button moves right under the action of the compression spring, the right end surface of the hook is attached to the inner wall of the through hole, and the convex edge of the hook of the lower half of the unlocking button hooks the limiting structure at the corresponding position of the lower body in the closed state of the cover backrest.

[0011] Further, the end surface of the lower body in contact with the cover backrest is provided with an ejection mechanism, the height of the movable end of the ejection mechanism is higher than the end surface, the movable end of the ejection mechanism is pressed down to store energy after the cover backrest is closed, and the cover backrest is ejected outwards after the ejection mechanism releases energy.

[0012] Furthermore, the fence connection assembly includes a body, a top cover, a button, and a spring; The upper end of the main body has a mounting cavity on each of the left and right sides. The bottom surface of the mounting cavity has a spring mounting groove and two upper cover positioning grooves. The two positioning grooves are distributed in front and behind. The outer sides of the left and right mounting cavities extend outward in the left and right directions respectively. A connecting edge is machined on the connecting edge through the thickness direction. The lower end of the main body has a downward protruding foot. The upper cover has an internal mounting cavity, and the bottom of the upper cover has a protrusion that mates with the positioning groove in the mounting cavity of the main body; The button has a spring mounting cavity at the bottom and a slotted hook at the top; After the button is installed into the mounting cavity of the top cover, the two ends of the spring are respectively installed into the spring mounting slot in the mounting cavity of the main body and the spring mounting cavity at the bottom of the button. Then the top cover is pressed down into the mounting cavity of the main body, and the protrusion at the bottom of the top cover is embedded in the positioning groove of the mounting cavity. The top cover is fixed to the main body by screws. At this time, the spring is in a compressed state.

[0013] Furthermore, the semi-fence includes an upper cover, a lower cover, a limit button, and a compression spring; Both the upper and lower covers have an overall shape that is bent at both ends. One end of the upper cover has two parallel connecting ears, and the other end is a round tube with an outer diameter smaller than the outer diameter of the rest of the cover. The limit button consists of two different cylindrical segments. The cavity inside the larger cylindrical segment is fitted with a compression spring, while the smaller cylindrical segment passes through the through hole in the lower cover. After the upper and lower covers are fixed together, the limit button is compressed and confined inside the tubular structure, with the smaller cylindrical segment of the limit button located outside the tubular structure.

[0014] Furthermore, the support rod includes a front cover, a rear cover, a button, and a compression spring; The front cover of the support rod has a T-shaped structure, and the upper horizontal part is a tubular structure. The front cover and the rear cover of the support rod are snapped together to form a mounting cavity for the support rod button. The support rod button is confined in the mounting cavity with the help of a compression spring. Under the action of the compression spring, the front end of the support rod button is outside the front cover of the support rod, and there is a horizontal notch below the front end of the support rod button.

[0015] Furthermore, the surface of the upper body is provided with a support rod mounting groove. When the support rod button is pressed down in the horizontal direction, the horizontal notch at the front end of the support rod button retracts into the support rod front cover. The support rod is aligned with the mounting groove and inserted. After the support rod is fully inserted, the support rod button is released, the compression spring releases the pressure, and the horizontal notch at the front end of the support rod button locks the edge of the upper body, realizing the connection between the support rod and the upper body. The back of the cover plate backrest is provided with a fence connection component mounting groove. A limiting groove is provided on the horizontal bottom surface of the mounting groove, and two limiting grooves are provided on the horizontal top surface of the mounting groove. The protruding foot at the lower end of the main body is inserted downward into the limiting groove. When the button is pressed down, the slot hook on the button moves downward simultaneously, pushing the main body forward into the mounting groove. After the button is released, the internal spring releases the pressure and moves upward. The slot hook above the button locks the limiting groove, realizing the connection between the fence connection component and the cover plate backrest. One end of the semi-fence with a connecting ear is movably connected to the connecting edge on the fence connecting assembly body via bolts. The semi-fence can rotate horizontally around the connection point. The other end of the semi-fence cooperates with the tubular structure at the upper end of the support rod front cover to realize the opening and closing of the fence. When closing the fence, press the limit button to retract it into the round tube, insert the round tube into the tubular structure at the upper end of the support rod front cover. The tubular structure has a limit hole that matches the small cylindrical section of the limit button. After the limit button moves to the correct position, the small cylindrical section enters the limit hole under the action of the compression spring, realizing the connection between the fence, the fence connecting assembly, and the support rod.

[0016] Furthermore, the omnidirectional wheel includes an omnidirectional wheel assembly and a locking / unlocking assembly; the omnidirectional wheel assembly is installed by engaging with an axle hole on the vehicle body through a wheel axle, and the omnidirectional wheel assembly has circumferential and axial degrees of freedom relative to the vehicle body; the locking / unlocking assembly is installed on the vehicle body, and engages with the wheel axle of the omnidirectional wheel assembly, thereby simultaneously locking and unlocking the circumferential and axial degrees of freedom of the omnidirectional wheel assembly.

[0017] Furthermore, the omnidirectional wheel assembly includes an axle, a wheel frame, a plug, a bracket, and a wheel; The upper end of the wheel axle is provided with an annular groove, and the outer circumferential surface below the annular groove is provided with a conical groove, the large end of the cone being located on the outer circumferential surface of the wheel axle; The top of the wheel frame is provided with a circular mounting groove. The bottom of the wheel axle is inserted into the mounting groove and fixedly connected to the wheel frame. The wheel is mounted on the wheel frame through a bearing. A plug is assembled on the wheel frame at the bearing mounting position to prevent the bearing from moving. The bracket is installed below the wheel frame and fixed to the bottom surface of the wheel frame.

[0018] Furthermore, the omnidirectional wheel assembly also includes a spring, a screw, a threaded rod, and a knob. The front end of the wheel frame has a vertical mounting surface. The spring is in close contact with the inner side of the mounting surface and its upper end is fixed by a screw. One end of the threaded rod passes through the mounting surface from the outside and contacts the surface of the middle section of the spring. The other end of the threaded rod is fitted with a mounting knob. The knob drives the threaded rod to rotate, causing the threaded rod to produce linear motion and push the spring to approach or move away from the wheel surface, thereby realizing stepless adjustment of the wheel speed.

[0019] Furthermore, the locking and unlocking assembly includes a button fixing shell, a button, a locking key, a push rod limiting member, a push rod return spring, a push rod, a mounting shell, a pin return spring, a toggle block return spring, a pin, a pin limiting shell, and a toggle block; The outer circumferential surface of the button fixing shell has a radially extending annular protrusion. The inner circumferential surface of the button fixing shell has strip-shaped protrusions evenly distributed along the circumferential direction. The bottom of the strip-shaped protrusions extends to the inner bottom surface of the button fixing shell. The front end of the strip-shaped protrusions consists of two inclined surfaces in the same direction. The different heights of the two inclined surfaces form a sawtooth-shaped step between them. The area between adjacent protrusions forms a reset groove along the axial direction. One end of the button is the pressing end, and the other end is the enabling end. The end face of the enabling end is machined with continuous triangular protrusions, and the outer circumferential surface of the enabling end has a raised strip, which cooperates with the reset groove inside the button fixing shell. The locking button is a circular shell that is closed at one end and open at the other. The open end extends radially into an annular convex edge, and there is a convex strip on the surface of the annular convex edge. The end face of the convex strip facing the closed end is a slope, which matches the triangular protrusion on the enable end of the button. Both the push rod and the pin are composed of two parts: a rod body and a disc-shaped body. The end face of the disc-shaped body is provided with a mounting cavity for the pin return spring. The mounting housing has two mounting cavities, an upper one and an lower one. The upper horizontal mounting cavity houses a lever and a lever return spring. The lever can move horizontally within the mounting cavity under the action of the lever return spring. The lever has a strip-shaped groove. There is a circular through hole on the bottom surface of the mounting cavity. When the upper end of the wheel axle passes through the through hole on the bottom surface of the mounting cavity and the strip-shaped groove on the lever, the left end of the strip-shaped groove is embedded into the annular groove of the wheel axle under the action of the lever return spring, thus restricting the axial displacement of the wheel axle. The mounting cavity below the mounting housing has a vertical partition that divides the mounting cavity into left and right parts. A through hole is located in the center of the partition. The push rod passes through this through hole and is fitted with a push rod return spring. A push rod limiting member is installed at the end of the rod, compressing the push rod return spring between the push rod limiting member and the partition. The button fixing housing is fixed to the left end face of the mounting housing by an annular protrusion on its outer circumference. The button is fitted inside the button fixing housing. The protrusion on the button, when engaged with the button fixing housing, restricts the button from detaching from the button fixing housing and from rotating within it. The closed end of the locking key is fitted inside the button's cavity, and the open end of the locking key is in contact with the push rod limiting member. The pin limiting housing, connected to the disc-shaped body of the push rod, forms a closed mounting chamber. The disc-shaped body of the pin is located within this mounting chamber. The pin return spring is pre-compressed between the push rod and the disc-shaped body of the pin, and the rod of the pin is located outside the pin limiting housing. The locking and unlocking components are fixed to the vehicle body by the mounting shell. The position of the toggle block corresponds to the position of the annular groove on the upper end of the wheel axle after the universal wheel assembly is installed in place, and the position of the pin corresponds to the position of the pin hole on the wheel axle.

[0020] Beneficial effects: 1. This invention designs the rear half of the seat surface as an openable cover backrest. After being flipped open, it can be locked into a fixed backrest, allowing the backrest position to move forward and be closer to the child's waist, providing effective support and preventing safety accidents caused by leaning forward or backward during exercise. The backrest and seat are designed as an integrated unit, forming a complete seat surface when closed, which can accommodate children of different ages.

[0021] 2. The fence and support rods of this invention can be completely disassembled, and the cover plate backrest can be reset into a seat surface. It can quickly switch between "with guardrail mode" and "normal mode" to meet the needs of children of different ages: young children need guardrail protection, while older children can remove the guardrail to expand their activity space. In addition, the modular design makes it easy to store and replace, reducing maintenance costs.

[0022] 3. This invention uses a fence connecting component and a support rod to form a three-point support structure in the backrest and the front half of the seat. Connecting two half-fences forms a closed fence, creating a complete ring-shaped protection to prevent children from tipping over or falling forward, effectively improving the safety of the ride-on vehicle. The half-fences are quickly locked to the support rod via a limit button, and the fence connecting component can be easily installed and removed with a single button spring mechanism, allowing for quick switching between usage modes without tools.

[0023] 4. The universal wheel of the present invention enables one-click installation and removal of the universal wheel from the vehicle body through the locking and unlocking component, and also enables one-click locking and unlocking. When parents need to pull or push the vehicle while the child is riding on the ride-on car, they only need to press the button to lock the universal wheel. When they need to play, they can unlock the universal wheel by pressing the button once.

[0024] 5. The locking and unlocking component of the present invention integrates one-click assembly and disassembly of the caster wheel and one-click switching between two states of the caster wheel. By horizontally moving the lever, the axial limit of the annular groove of the wheel axle can be released, realizing the assembly and disassembly of the caster wheel. When the button is pressed, the horizontal thrust is transmitted sequentially through the button to the locking key, the push rod limiter, and the push rod. The push rod drives the pin limiter and the pin to move forward synchronously. Since the push rod return spring abuts against the push rod limiter and the partition, the push rod return spring applies a reverse force to the locking key through the push rod limiter. At this time, the triangular protrusion on the enable end of the button contacts the inclined surface of the protrusion on the locking key. As the pressing stroke increases, the locking key rotates by an angle (i.e., rotates one tooth pitch) under the combined action of the push rod return spring and the button, releasing the button. At this time, the front end of the protrusion on the locking key is engaged in the serrated step of the strip protrusion inside the button fixing shell, and the pin remains in the extended position. When it is necessary to unlock the caster wheel, the button is pressed again, and the locking key rotates by another angle. The protrusion on the locking key is aligned with the gap between the strip protrusions inside the button fixing shell. The unlocked locking key, under the action of the push rod return spring, drives the pin to retract and disengage from the pin hole on the wheel axle, achieving one-button unlocking.

[0025] 6. The universal wheel assembly of the present invention is equipped with a spring plate. The screw is controlled by a knob to push the spring plate forward and backward horizontally. The rolling friction of the wheel is controlled by the contact pressure between the spring plate and the wheel, realizing stepless adjustment of the speed of the scooter and effectively improving the safety of children of different ages when playing. In addition, when the rear wheel is unlocked, the scooter can also have a "tail-drifting" function during the game, which enhances the entertainment value of the scooter. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the hovercraft of the present invention; Figure 2 for Figure 1 Rear view; Figure 3 for Figure 2 AA section view; Figure 4 for Figure 2 BB cross-sectional view; Figure 5 for Figure 2 CC section view; Figure 6 Exploded view of the fence and supports; Figure 7 This is a schematic diagram showing the mating relationship between the fence connection components and the cover plate backrest; Figure 8 This is a schematic diagram of the twist car of the present invention after the fence and support poles have been removed (cover and backrest closed). Figure 9This is a schematic diagram of the twist car of the present invention after the fence and support poles have been removed (cover backrest open). Figure 10 for Figure 9 AA section view; Figure 11 for Figure 10 Enlarged view of a section at point C; Figure 12 for Figure 9 BB cross-sectional view; Figure 13 for Figure 9 DD sectional view; Figure 14 A top view of the back of the scooter without the cover; Figure 15 for Figure 14 AA section view; Figure 16 for Figure 15 A magnified view of a section at point A in the middle; Figure 17 An exploded view of the lock / unlock components; Figure 18 for Figure 17 AA section view; Figure 19 This is a side view of the scooter; Figure 20 for Figure 19 A magnified view of a section at point B in the middle; Figure 21 This is an exploded view of the omnidirectional wheel assembly.

[0027] Among them, 1-cover backrest, 2-lower body, 3-upper body, 4-unlock button, 5-end cap, 6-swivel wheel, 6-1-swivel wheel assembly, 6-1-1-wheel axle, 6-1-2-wheel frame, 6-1-3-end cap, 6-1-4-bracket, 6-1-5-wheel, 6-1-6-spring, 6-1-7-screw, 6-1-8-knob, 6-1-9-screw, 6-2-locking and unlocking assembly, 6-2-1-button fixing shell, 6-2-2-button, 6-2-3-locking key, 6-2-4-push rod limiter, 6-2-5-push rod return spring, 6-2-6-push rod, 6-2-7-mounting shell, 6-2-8 - Pin return spring, 6-2-9- Toggle block return spring, 6-2-10- Pin, 6-2-11- Pin limit shell, 6-2-12- Toggle block, 7- Front wheel assembly, 8- Push-out mechanism, 9- Half fence, 9-1- Upper right cover, 9-2- Lower right cover, 9-3- Limit button, 9-4- Compression spring, 9-5- Upper left cover, 9-6- Lower left cover, 10- Support rod, 10-1- Support rod front cover, 10-2- Support rod rear cover, 10-3- Support rod button, 10-4- Compression spring, 11- Fence connecting assembly, 11-1- Body, 11-2- Button, 11-3- Top cover, 11-4- Spring, 12- Compression spring, 13- Locking screw. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] This invention provides a scooter with rear-mounted omnidirectional wheels and a flip-up backrest, comprising three main parts: a frame, a deformable backrest system, and a safety protection system. The scooter body consists of an upper body 3 and a lower body 2 forming a basic load-bearing structure. A front wheel assembly 7 is installed at the front of the scooter body, and two omnidirectional wheels 6 are equipped at the rear of the scooter body, forming a stable three-point support system.

[0030] like Figure 2 and 7 As shown, the core component of the deformable backrest, the cover backrest 1, achieves its shape transformation through a special connecting mechanism. An unlocking button 4 is located in the center of one end of the cover backrest 1, and insert rod structures extend horizontally from the left and right sides of the other end. The insert rod structures are machined with oblong holes.

[0031] Figure 12 The diagram illustrates the specific method by which the locking screw 13 passes through the oblong hole in the insert structure of the cover backrest 1, thereby movably connecting the cover backrest 1 to the upper body 3. The oblong hole design provides the necessary adjustment space for the flipping process. An ejection mechanism 8 is installed on the end face of the lower body 2 that contacts the cover backrest 1. This mechanism is pressed down to store energy when the cover backrest 1 is closed. When the unlock button 4 is pressed, the ejection mechanism 8 quickly releases energy, pushing the cover backrest 1 outwards for easy opening.

[0032] like Figure 11 As shown, the unlock button 4 adopts a split structure design. The upper half of the unlock button 4 has a spring mounting cavity on the left and a recessed pressing part on the right; the lower half is a hook that extends downward, with a raised edge extending horizontally from the bottom of the hook. After the spring 12 is installed in the spring mounting cavity, it cooperates with the mounting groove on the backrest of the cover plate 1 to realize the automatic reset function.

[0033] like Figure 12 As shown, a limiting groove is provided in the middle of the lower body 2. When the cover backrest 1 is flipped counterclockwise to a set angle, it is lifted up, and then the insert rod structure on the cover backrest 1 is inserted into the limiting groove of the lower body 2 to form a fixed backrest. When it needs to be lowered, the cover backrest 1 is lifted along the direction of the limiting groove to make it disengage from the limiting groove, and then flipped clockwise until it is completely attached to the lower body 2.

[0034] like Figure 6 As shown, the safety protection system includes a fence connection assembly 11, a support post 10, and two half-fences 9, wherein, as Figure 4 As shown, the fence connection assembly 11 includes a body 11-1, a top cover 11-3, a button 11-2, and a spring 11-4.

[0035] The upper end of the main body 11-1 has a mounting cavity on each of its left and right sides. The bottom surface of each mounting cavity has a spring mounting groove and two upper cover positioning grooves, which are arranged front to back. Connecting edges extend outwards from the outer sides of the two mounting cavities in the left and right directions, and connecting holes are machined through these edges in the thickness direction. The lower end of the main body 11-1 has a downward-facing protrusion, corresponding to… Figure 7 Point C in the diagram; the upper cover 11-3 has an internal mounting cavity, and the bottom of the upper cover 11-3 has two protrusions that mate with the positioning grooves in the mounting cavity of the main body. The button 11-2 has a spring mounting cavity at the bottom and a slot-type hook at the top, which mates with slots A and B on the backrest 1 of the cover plate; during assembly, after the button 11-2 is inserted into the mounting cavity of the upper cover 11-3, the two ends of the spring 11-4 are respectively inserted into the spring mounting groove in the mounting cavity of the main body and the spring mounting cavity at the bottom of the button, and then the upper cover 11-3 is pressed down into the mounting cavity of the main body 11-1. The protrusions at the bottom of the upper cover 11-3 are embedded in the positioning grooves of the mounting cavity. After the upper cover 11-3 and the main body 11-1 are fixed with screws, a complete assembly is formed. At this time, the spring 11-4 is in a compressed state.

[0036] Taking the right-side semi-fence 9 as an example, it consists of an upper right cover 9-1, a lower right cover 9-2, a limit button 9-3, and a compression spring 9-4. Both the upper right cover 9-1 and the lower right cover 9-2 have a bent-end structure, with two parallel connecting ears at one end and a cylindrical structure at the other. The limit button 9-3 consists of two cylindrical segments of different diameters; the larger cylindrical segment has a cavity into which the compression spring 9-4 is installed to achieve an elastic limit function.

[0037] The support rod 10 includes a front cover 10-1, a rear cover 10-2, a button 10-3, and a compression spring 10-4. The front cover 10-1 has a T-shaped structure, with the upper horizontal portion being a tubular structure. The button 10-3, in conjunction with the compression spring 10-4, is confined within the mounting cavity formed by the interlocking of the front cover 10-1 and the rear cover 10-2, achieving a one-button locking function.

[0038] The formation process of a complete fence: A complete fence requires three support points: both ends of the fence connecting assembly 11 mounted on the back of the cover plate backrest 1, and the support rod 10 at the front of the seat. (See attached...) Figure 7 As shown, the three connection points A, B, and C on the fence connecting component 11 correspond to the three points on the cover plate backrest 1. First, insert the protruding foot at the lower end of the body 11-1 into point C of the cover plate backrest 1, then press button 11-2 to engage points B and C, thus completing the connection between the fence connecting component 11 and the cover plate backrest 1. The connecting ears at one end of the two half-fences 9 are movably connected to the connecting edge on the body 11-1 by bolts, and the other ends of the two half-fences 9 are inserted into the tubular structure at the upper end of the support rod front cover 10-1 in the support rod 10, forming a complete ring-shaped protective structure.

[0039] As attached Figure 14 As shown, the omnidirectional wheel 6 includes an omnidirectional wheel assembly 6-1 and a locking / unlocking assembly 6-2. In this embodiment, there are two omnidirectional wheel assemblies 6-1, which are arranged in a left-right direction at the rear of the vehicle body.

[0040] The universal wheel assembly 6-1 is installed by engaging with the axle hole on the lower body 2 via the wheel axle 6-1-1. In the unlocked state, the universal wheel assembly 6-1 has circumferential and axial degrees of freedom relative to the body. The locking and unlocking assembly 6-2 is installed on the lower body 2 and engages with the wheel axle 6-1-1 in the universal wheel assembly 6-1, thereby simultaneously locking and unlocking the circumferential and axial degrees of freedom of the universal wheel assembly 6-1.

[0041] As attached Figure 20 and 21As shown, the swivel wheel assembly includes an axle 6-1-1, a wheel frame 6-1-2, a plug 6-1-3, a bracket 6-1-4, a spring 6-1-6, a wheel 6-1-5, a knob 6-1-8, a screw 6-1-7, and a bolt 6-1-9. The upper end of the axle 6-1-1 has an annular groove, and the outer circumference below the annular groove has a conical groove, with the larger end of the conical groove located on the outer circumference of the axle 6-1-1. The top of the wheel frame 6-1-2 has a circular mounting groove, and the bottom of the axle 6-1-1 is inserted into the mounting groove and fixedly connected to the wheel frame 6-1-2. The wheel 6-1-5 is mounted on the wheel frame 6-1-2 via a bearing. The plugs 6-1-3 on the left and right sides are fitted onto the wheel frame 6-1-2 corresponding to the bearing mounting positions to prevent bearing movement. The bracket 6-1-4 is installed below the wheel frame 6-1-2 and fixed to the bottom surface of the wheel frame 6-1-3.

[0042] To enable the omnidirectional wheel to adjust its speed, a vertical mounting surface is designed at the front end of the wheel frame 6-1-2. The spring piece 6-1-6 is tightly attached to the inner side of the mounting surface and fixed to its upper end by the screw 6-1-9. One end of the screw 6-1-7 passes through the mounting surface from the outside and contacts the surface of the middle section of the spring piece 6-1-6. The other end of the screw 6-1-7 is fitted with a mounting knob 6-1-8. The knob 6-1-8 drives the screw 6-1-7 to rotate, causing the screw 6-1-7 to move linearly and push the spring piece 6-1-6 closer to or away from the surface of the wheel 6-1-5. This achieves stepless adjustment of the wheel's speed during movement, thereby improving the safety of the scooter during play.

[0043] As attached Figure 16 , 17 As shown in Figure 18, the locking / unlocking assembly 6-2 includes a button retaining housing 6-2-1, a button 6-2-2, a locking key 6-2-3, a push rod limiting member 6-2-4, a push rod return spring 6-2-5, a push rod 6-2-6, a mounting housing 6-2-7, a pin return spring 6-2-8, a toggle block return spring 6-2-9, a pin 6-2-10, a pin limiting housing 6-2-11, and a toggle block 6-2-12.

[0044] The outer circumferential surface of the button retaining housing 6-2-1 has a radially extending annular raised edge, as shown in the attached image. Figure 17 As shown, strip-shaped protrusions are evenly distributed circumferentially on the inner circumferential surface of the button fixing shell 6-2-1. The bottom of the strip-shaped protrusions extends to the inner bottom surface of the button fixing shell 6-2-1. The front end of the strip-shaped protrusions consists of two inclined surfaces in the same direction. The different heights of the two inclined surfaces create a sawtooth-shaped step between them. The area between adjacent protrusions forms a reset groove for the locking key 6-2-3 to move axially. The structure of this component and its cooperation with the button 6-2-2 and the locking key 6-2-3 are the key to realizing the switching between the one-button universal and directional states.

[0045] One end of button 6-2-2 is the pressing end, and the other end is the enabling end. The end face of the enabling end is machined with continuous triangular protrusions, and the outer circumferential surface of the enabling end has circumferentially distributed ridges. These ridges cooperate with the reset groove inside the button fixing shell.

[0046] The locking button 6-2-3 is a circular shell that is closed at one end and open at the other. The open end extends radially with an annular convex edge. There is also a convex strip on the surface of the annular convex edge. The end face of the convex strip facing the closed end is a slope, which matches the triangular protrusion on the enable end of the button 6-2-2.

[0047] The push rod 6-2-6 and the pin 6-2-10 have similar structures, both consisting of a rod body and a disc-shaped body. The end face of the disc-shaped body is provided with three mounting cavities for the pin return spring.

[0048] All the above components are installed inside the mounting housing 6-2-7. The mounting housing 6-2-7 has two mounting cavities, an upper one and an lower one. The upper horizontal mounting cavity houses the toggle block 6-2-12 and the toggle block return spring 6-2-9. The toggle block can move horizontally within the mounting cavity under the action of the toggle block return spring 6-2-9. The toggle block 6-2-12 has a strip-shaped groove. There is a circular through hole on the bottom surface of the mounting cavity. When the upper end of the axle 6-1-1 passes through the through hole on the bottom surface of the mounting cavity and the strip-shaped groove on the toggle block 6-2-12, the left end of the strip-shaped groove is embedded into the annular groove of the axle under the action of the toggle block return spring 6-2-9, thus restricting the axial displacement of the axle 6-1-1.

[0049] The mounting cavity below the mounting housing 6-2-7 has a vertical partition that divides the mounting cavity into left and right parts. A through hole is located in the center of the partition. The push rod 6-2-6 passes through this through hole and is fitted with a push rod return spring 6-2-5. A push rod limiting member 6-2-4 is installed at the end of the rod, compressing the push rod return spring 6-2-5 between the pushing rod limiting member 6-2-4 and the partition. The button fixing housing 6-2-1 is fixed to the left end face of the mounting housing 6-2-7 by an annular protrusion on its outer circumference. The button is fitted inside the button fixing housing 6-2-1. The protrusion on the button, when engaged with the button fixing housing 6-2-1, restricts the button 6-2-2 from exiting the button fixing housing 6-2-1 and from rotating within it. The closed end of the locking key 6-2-3 is fitted inside the cavity of the button 3-2. The opening of the locking key 6-2-3... The inner part of the release end abuts against the push rod limiting part 6-2-4; after the pin limiting shell 6-2-11 is fixedly connected to the disc-shaped body of the push rod 6-2-6, a closed mounting chamber is formed. The disc-shaped body of the pin 3-10 is located in this mounting chamber. Three pin return springs 6-2-8 are pre-compressed between the disc-shaped bodies of the push rod 6-2-6 and the pin 6-2-10. The rod body of the pin 6-2-10 is located outside the pin limiting shell 6-2-11. Since the pin 6-2-10 is only subjected to the spring force of the pin return spring 3-8 when it moves with the pin limiting shell 6-2-11, when there is an error in the fit between the pin 3-10 and the pin hole on the axle 6-1-1, the pin return spring 6-2-8 will provide buffer protection for the pin 6-2-10 to avoid movement jamming and rigid damage, and has the function of adaptive adjustment of fit deviation.

[0050] As attached Figure 15 As shown, the locking and unlocking component 6-2 is fixed to the lower body 2 by the mounting shell 6-2-7. The position of the toggle block 6-2-12 corresponds to the position of the annular groove on the upper end of the wheel axle 6-1-1 after the universal wheel assembly 6-1 is installed in place. The position of the rod of the pin 6-2-10 corresponds to the height position of the pin hole on the wheel axle.

[0051] The process of one-click assembly and disassembly of the universal wheel assembly in this embodiment is as follows: When installing the caster wheel assembly 6-1, first insert the axle 6-1-1 of the caster wheel assembly 6-1 into the axle hole on the lower body 2. At the same time, move the lever 6-2-12 to allow space for the movement of the axle 6-1-1. After the axle 6-1-1 is in place, release the lever 6-2-12. Under the action of the lever return spring 6-2-9, the strip groove on the lever 6-2-12 is inserted into the annular groove at the upper end of the axle 6-1-1, which restricts the axial displacement of the axle 6-1-1 and thus also restricts the axial displacement of the caster wheel assembly 6-1. This allows the caster wheel assembly 6-1 to be installed with the body with one click. Similarly, when removing the caster wheel assembly 6-1, move the lever 6-2-12 horizontally in the opposite direction to release the axial restriction on the annular groove of the axle 6-1-1, thus allowing the caster wheel assembly 6-1 to be removed.

[0052] This invention enables the directional movement of the caster wheel assembly 2 by pressing a button to drive a pin into the pin hole of the axle 2-1. Pressing the button 3-2 again causes the pin 3-10 to retract and disengage from the pin hole, restoring the circumferential rotation function of the caster wheel assembly 2. The specific process of switching between the omnidirectional and directional states of the caster wheel assembly 2 is as follows: When button 6-2-2 is pressed for the first time, the horizontal thrust is transmitted sequentially through button 6-2-2 to locking key 6-2-3, push rod limiting member 6-2-4, and push rod 6-2-6. Push rod 6-2-6 drives pin limiting shell 6-2-11 and pin 6-2-10 to move forward synchronously. Since push rod return spring 6-2-5 abuts against push rod limiting member 6-2-4 and partition, push rod return spring 6-2-5 applies a reverse force to locking key 6-2-3 through push rod limiting member 6-2-4. At this time, the triangular protrusion on the enabling end of button 6-2-2 contacts and engages with the inclined surface of the protrusion on locking key 6-2-3. As the pressing stroke increases, locking key 6-2-3 rotates by an angle (i.e., rotates by one tooth pitch) under the combined action of push rod return spring 6-2-5 and button. When the button is released, the front end of the protrusion on the locking key 6-2-3 engages with the serrated step of the strip protrusion inside the button fixing housing 6-2-1. The pin 6-2-10 remains in the extended position. Once the pin aligns with the pin hole on the axle 6-1-1, the pin 6-2-10 immediately locks the axle 6-1-1. When it is necessary to unlock the universal wheel assembly 6-1, the button 6-2-2 is pressed a second time. The locking key 6-2-3 rotates another angle, and the protrusion on the locking key 6-2-3 aligns perfectly with the gap between the strip protrusions inside the button fixing housing 6-2-1. The unlocked locking key 6-2-3, under the action of the push rod return spring 6-2-5, drives the pin 6-2-10 to retract and disengage from the pin hole on the axle 6-1-1, thus achieving one-button unlocking of the universal wheel assembly 6-1.

[0053] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A scooter with rear-mounted omnidirectional wheels and a flip-up backrest, characterized in that, The seat of the scooter consists of a fixed part and a movable part. When the backrest is needed, the movable part is separated from the fixed part and opened by flipping or disassembling. After opening and locking with the fixed part, it forms the fixed backrest of the scooter. The back of the fixed backrest is detachably equipped with a fence connecting component. The front half of the seat is detachably connected to a support rod. The two ends of the two half fences are assembled with the fence connecting component and the support rod respectively to form a closed fence. After the half fences and the support rod are removed, the movable part of the seat is unlocked and flipped closed. The movable part of the seat and the fixed part form the complete seat of the scooter. The wheels installed at the rear of the scooter are omnidirectional wheels with one-button locking and unlocking functions.

2. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 1, characterized in that, The body of the scooter includes an upper body, a lower body, a cover backrest, a locking screw, and an unlocking button; The cover plate has an unlocking button in the middle of one end of the backrest, and the other end has a rod structure extending horizontally on the left and right sides, with a waist-shaped hole machined on the rod structure. The locking screw passes through the waist-shaped hole on the cover plate backrest insert structure and movably connects the cover plate backrest to the upper body. The cover plate backrest is locked and unlocked with the lower body through the unlocking button. The lower body has a limiting groove in the middle. When the cover backrest is flipped counterclockwise to a set angle, it is lifted up and then inserted into the limiting groove of the lower body to form a fixed backrest. When the cover backrest needs to be lowered, the cover backrest is lifted along the direction of the limiting groove to disengage it from the limiting groove and then flipped clockwise until it fits against the lower body. The unlocking button locks the cover backrest and the lower body together.

3. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 1, characterized in that, The upper half of the unlock button has a spring mounting cavity on the left side, a recessed pressing part on the right side of the upper half, and a hook extending downwards in the lower half of the unlock button, with a protruding edge extending horizontally from the bottom of the hook. After the spring is installed in the spring mounting cavity of the unlock button, it cooperates with the mounting groove on the back of the cover plate. The hook of the lower half of the unlock button passes through the through hole of the mounting block. Under the action of the spring, the unlock button moves to the right. The right end face of the hook fits against the inner wall of the through hole. When the back of the cover plate is closed, the protruding edge of the hook of the lower half of the unlock button hooks the limiting structure at the corresponding position of the lower body.

4. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 3, characterized in that, The fence connection assembly includes a body, a top cover, a button, and a spring; The upper end of the main body has a mounting cavity on each of the left and right sides. The bottom surface of the mounting cavity has a spring mounting groove and two upper cover positioning grooves. The two positioning grooves are distributed in front and behind. The outer sides of the left and right mounting cavities extend outward in the left and right directions respectively. A connecting edge is machined on the connecting edge through the thickness direction. The lower end of the main body has a downward protruding foot. The upper cover has an internal mounting cavity, and the bottom of the upper cover has a protrusion that mates with the positioning groove in the mounting cavity of the main body; The button has a spring mounting cavity at the bottom and a slotted hook at the top; After the button is installed into the mounting cavity of the top cover, the two ends of the spring are respectively installed into the spring mounting slot in the mounting cavity of the main body and the spring mounting cavity at the bottom of the button. Then the top cover is pressed down into the mounting cavity of the main body, and the protrusion at the bottom of the top cover is embedded in the positioning groove of the mounting cavity. The top cover is fixed to the main body by screws. At this time, the spring is in a compressed state.

5. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 4, characterized in that, The semi-fence includes an upper cover, a lower cover, a limit button, and a compression spring; Both the upper and lower covers have an overall shape that is bent at both ends. One end of the upper cover has two parallel connecting ears, and the other end is a round tube with an outer diameter smaller than the outer diameter of the rest of the cover. The limit button consists of two different cylindrical segments. The cavity inside the larger cylindrical segment is fitted with a compression spring, while the smaller cylindrical segment passes through the through hole in the lower cover. After the upper and lower covers are fixed together, the limit button is compressed and confined inside the tubular structure, with the smaller cylindrical segment of the limit button located outside the tubular structure.

6. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 5, characterized in that, The support rod includes a front cover, a rear cover, a button, and a compression spring; The front cover of the support rod has a T-shaped structure, and the upper horizontal part is a tubular structure. The front cover and the rear cover of the support rod are snapped together to form a mounting cavity for the support rod button. The support rod button is confined in the mounting cavity with the help of a compression spring. Under the action of the compression spring, the front end of the support rod button is outside the front cover of the support rod, and there is a horizontal notch below the front end of the support rod button.

7. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 6, characterized in that, The surface of the upper body is provided with a support rod mounting groove. When the support rod button is pressed down horizontally, the horizontal notch at the front end of the support rod button retracts into the support rod front cover. The support rod is aligned with the mounting groove and inserted. After the support rod is fully inserted, the support rod button is released, the compressed spring releases the pressure, and the horizontal notch at the front end of the support rod button locks the edge of the upper body, realizing the connection between the support rod and the upper body. The back of the cover plate backrest is provided with a fence connection component mounting groove. A limiting groove is provided on the horizontal bottom surface of the mounting groove, and two limiting grooves are provided on the horizontal top surface of the mounting groove. The protruding foot at the lower end of the main body is inserted downward into the limiting groove. When the button is pressed down, the slot hook on the button moves downward simultaneously, pushing the main body forward into the mounting groove. After the button is released, the internal spring releases the pressure and moves upward. The slot hook above the button locks the limiting groove, realizing the connection between the fence connection component and the cover plate backrest. One end of the semi-fence with a connecting ear is movably connected to the connecting edge on the fence connecting assembly body via bolts. The semi-fence can rotate horizontally around the connection point. The other end of the semi-fence cooperates with the tubular structure at the upper end of the support rod front cover to realize the opening and closing of the fence. When closing the fence, press the limit button to retract it into the round tube, insert the round tube into the tubular structure at the upper end of the support rod front cover. The tubular structure has a limit hole that matches the small cylindrical section of the limit button. After the limit button moves to the correct position, the small cylindrical section enters the limit hole under the action of the compression spring, realizing the connection between the fence, the fence connecting assembly, and the support rod.

8. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 7, characterized in that, The omnidirectional wheel includes an omnidirectional wheel assembly and a locking / unlocking assembly; the omnidirectional wheel assembly is installed by engaging with an axle hole on the vehicle body through a wheel axle, and the omnidirectional wheel assembly has circumferential and axial degrees of freedom relative to the vehicle body; the locking / unlocking assembly is installed on the vehicle body, and engages with the wheel axle of the omnidirectional wheel assembly to simultaneously lock and unlock the circumferential and axial degrees of freedom of the omnidirectional wheel assembly.

9. The scooter with rear-mounted omnidirectional wheels and a flip-up backrest as described in claim 8, characterized in that, The omnidirectional wheel assembly includes an axle, a wheel frame, a plug, a bracket, and wheels; The upper end of the wheel axle is provided with an annular groove, and the outer circumferential surface below the annular groove is provided with a conical groove, the large end of the cone being located on the outer circumferential surface of the wheel axle; The top of the wheel frame is provided with a circular mounting groove. The bottom of the wheel axle is inserted into the mounting groove and fixedly connected to the wheel frame. The wheel is mounted on the wheel frame through a bearing. A plug is assembled on the wheel frame at the bearing mounting position to prevent the bearing from moving. The bracket is installed below the wheel frame and fixed to the bottom surface of the wheel frame.

10. The scooter with rear-mounted casters and a flip-up backrest as described in claim 8 or 9, characterized in that, The locking and unlocking assembly includes a button fixing shell, a button, a locking key, a push rod limiting component, a push rod return spring, a push rod, a mounting shell, a pin return spring, a toggle block return spring, a pin, a pin limiting shell, and a toggle block. The outer circumferential surface of the button fixing shell has a radially extending annular protrusion. The inner circumferential surface of the button fixing shell has strip-shaped protrusions evenly distributed along the circumferential direction. The bottom of the strip-shaped protrusions extends to the inner bottom surface of the button fixing shell. The front end of the strip-shaped protrusions consists of two inclined surfaces in the same direction. The different heights of the two inclined surfaces form a sawtooth-shaped step between them. The area between adjacent protrusions forms a reset groove along the axial direction. One end of the button is the pressing end, and the other end is the enabling end. The end face of the enabling end is machined with continuous triangular protrusions, and the outer circumferential surface of the enabling end has a raised strip, which cooperates with the reset groove inside the button fixing shell. The locking button is a circular shell that is closed at one end and open at the other. The open end extends radially into an annular convex edge, and there is a convex strip on the surface of the annular convex edge. The end face of the convex strip facing the closed end is a slope, which matches the triangular protrusion on the enable end of the button. Both the push rod and the pin are composed of two parts: a rod body and a disc-shaped body. The end face of the disc-shaped body is provided with a mounting cavity for the pin return spring. The mounting housing has two mounting cavities, an upper one and an lower one. The upper horizontal mounting cavity houses a lever and a lever return spring. The lever can move horizontally within the mounting cavity under the action of the lever return spring. The lever has a strip-shaped groove. There is a circular through hole on the bottom surface of the mounting cavity. When the upper end of the wheel axle passes through the through hole on the bottom surface of the mounting cavity and the strip-shaped groove on the lever, the left end of the strip-shaped groove is embedded into the annular groove of the wheel axle under the action of the lever return spring, thus restricting the axial displacement of the wheel axle. The mounting cavity below the mounting housing has a vertical partition that divides the mounting cavity into left and right parts. A through hole is located in the center of the partition. The push rod passes through this through hole and is fitted with a push rod return spring. A push rod limiting member is installed at the end of the rod, compressing the push rod return spring between the push rod limiting member and the partition. The button fixing housing is fixed to the left end face of the mounting housing by an annular protrusion on its outer circumference. The button is fitted inside the button fixing housing. The protrusion on the button, when engaged with the button fixing housing, restricts the button from detaching from the button fixing housing and from rotating within it. The closed end of the locking key is fitted inside the button's cavity, and the open end of the locking key is in contact with the push rod limiting member. The pin limiting housing, connected to the disc-shaped body of the push rod, forms a closed mounting chamber. The disc-shaped body of the pin is located within this mounting chamber. The pin return spring is pre-compressed between the push rod and the disc-shaped body of the pin, and the rod of the pin is located outside the pin limiting housing. The locking and unlocking components are fixed to the vehicle body by the mounting shell. The position of the toggle block corresponds to the position of the annular groove on the upper end of the wheel axle after the universal wheel assembly is installed in place, and the position of the pin corresponds to the position of the pin hole on the wheel axle.

Images