Trolley with replaceable front wheels

Abstract

The trolley with the replaceable front wheels comprises a trolley frame, a first front wheel assembly and a second front wheel assembly, two mounting seats are arranged on the front portion of the trolley frame, and mounting holes are formed in the mounting seats; the first front wheel assembly comprises a first wheel body and a first wheel seat, and the first wheel seat is provided with a vertical first connecting shaft; the second front wheel assembly comprises a second wheel body and two connecting arms, one end of each connecting arm is connected with the second wheel body, and the other end is provided with a vertical second connecting shaft; the trolley has a first mode and a second mode, in the first mode, the first connecting shaft is matched with the mounting hole in an inserted mode, and the first wheel body can universally rotate around the vertical first connecting shaft; and in the second mode, the second connecting shaft is matched with the mounting hole in an inserted mode, the trolley can be switched into a four-wheel universal mode, a three-wheel universal mode or a three-wheel directional mode according to user requirements, the two front wheel assemblies are matched with the same mounting base, assembling is convenient, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This application relates to an outdoor product, and more particularly to a handcart with replaceable front wheels. Background Technology

[0002] Existing outdoor trailers or trolleys, such as the patent document US9469370B2, disclose a crossbar for a bicycle trailer attachment, with a frame including two rear wheels and a swivel wheel.

[0003] For example, patent document CN218877363U discloses a child transport device, which includes a frame, a front wheel detachably mounted on the frame, a rear wheel fixedly mounted on the frame, and a tow bar detachably mounted on the frame. When used as a trailer, the front wheel is removed and the tow bar is installed; when used as a stroller, the front wheel is installed and the tow bar is removed. The front wheel is a single, directional wheel to ensure that the vehicle can move in a straight line, meeting the user's need for the vehicle to travel in a straight line when pushing the stroller or running. When turning is required, pressure is applied to the handle on the rear side of the frame, causing the front wheel to lift and then applying force to adjust the vehicle's direction of travel.

[0004] For example, patent document US20240092413A1 discloses a bicycle trailer, including a frame, two front wheels detachably mounted on the frame, a rear wheel fixedly mounted on the frame, and a tow bar mounted on the frame for connecting to the bicycle. When used as a trailer, the front wheels are removed and the tow bar is installed; when used as a pushcart, the tow bar is removed and the front wheels are installed. The two front wheels are swivel wheels, making straight-line travel difficult, but steering is more flexible than with a single wheel. Therefore, existing outdoor vehicles cannot simultaneously meet multiple user needs. Utility Model Content

[0005] This application provides a handcart with replaceable front wheels, which can meet various user needs and is convenient to use.

[0006] This application provides a handcart with replaceable front wheels, comprising:

[0007] The frame has two mounting seats at its front, and the mounting seats have mounting holes.

[0008] A first front wheel assembly, the first front wheel assembly including a first wheel body and a first wheel seat, the first wheel seat having a vertical first connecting shaft;

[0009] The second front wheel assembly includes a second wheel body and two connecting arms. One end of each connecting arm is connected to the second wheel body, and the other end is provided with a vertical second connecting shaft.

[0010] The handcart has a first mode and a second mode. In the first mode, the first connecting shaft is inserted into the mounting hole, and the first wheel can rotate omnidirectionally around the vertical first connecting shaft. In the second mode, the second connecting shaft is inserted into the mounting hole.

[0011] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0012] Optionally, the second wheel, supported by the two connecting arms, can only rotate and travel in the same direction.

[0013] Optionally, the mounting base is equipped with a locking element for locking the first connecting shaft and the second connecting shaft.

[0014] Optionally, the locking member is slidably disposed on the mounting base and has a locking state acting on the first connecting shaft and the second connecting shaft, and an unlocking state where the action is released.

[0015] Optionally, the locking member has a locking portion that mates with the first connecting shaft and the second connecting shaft, and an operating portion. The first connecting shaft and the second connecting shaft have radially inwardly recessed annular grooves. In the locked state, the locking portion extends into the annular grooves.

[0016] Optionally, the connecting arm is connected to the axle end of the wheel body.

[0017] Optionally, a transverse connecting rod is provided between the two connecting arms.

[0018] Optionally, the frame includes a base frame, side frames disposed on both sides of the base frame, a transverse connecting member between the two side frames, and a push handle connected between the two side frames; the mounting base is disposed at the front of the base frame.

[0019] Optionally, the base frame includes two longitudinal bars extending in the front-rear direction and multiple crossbars disposed between the two longitudinal bars, with the mounting base disposed on the front crossbars.

[0020] Optionally, the crossbar is a square tube, and the mounting base has a U-shaped groove adapted to the crossbar.

[0021] Optionally, the axle of the second wheel body is provided with a fixed seat and a movable seat at both ends, the fixed seat is fixedly connected to one of the connecting arms, and the movable seat is partially inserted into the other connecting arm and slides with the connecting arm along an axial direction;

[0022] The handcart also includes a limiting member movably disposed within the movable seat, and an adjusting member that radially penetrates the connecting arm and the limiting member. An inclined surface is provided between the limiting member and the movable seat. The adjusting member is used to drive the limiting member to move radially to adjust the rotation amplitude of the second wheel.

[0023] This application describes a handcart with replaceable front wheels. The front wheels of the handcart can be replaced to switch between a first mode with four wheels (two first wheels rotating in all directions) and a second mode with three wheels. The three wheels can be fixed wheels or omnidirectional wheels to meet different user needs. Both the first and second front wheel assemblies are compatible with the mounting base, which facilitates assembly and reduces manufacturing costs. Attached Figure Description

[0024] Figure 1 This is a structural view of the handcart in a first mode according to an embodiment of this application;

[0025] Figure 2 for Figure 1 Exploded view of the first front wheel assembly and frame of the handcart;

[0026] Figure 3 This is a structural view of the handcart in a second mode according to an embodiment of this application;

[0027] Figure 4 This is a structural view of the handcart after the towing bar is installed in a first mode according to an embodiment of this application;

[0028] Figure 5 This is a structural view of a handcart after the front wheel assembly has been removed and the towing bar has been installed according to one embodiment of this application;

[0029] Figure 6 for Figure 2 Top view of a handcart;

[0030] Figure 7 for Figure 6 Partial sectional view along the AA direction;

[0031] Figure 8 for Figure 2 Front view of the trolley;

[0032] Figure 9 for Figure 8 Partial sectional view along the BB direction.

[0033] The attached diagram is described below:

[0034] 1000, handcart;

[0035] 100. First front wheel assembly; 110. First wheel body; 120. First wheel seat; 121. First connecting shaft; 130. Annular groove;

[0036] 200. Second front wheel assembly; 210. Second wheel body; 211. Wheel axle; 220. Connecting arm; 221. Second connecting shaft; 222. Straight section; 223. Bent section; 230. Fixed seat; 240. Movable seat; 250. Limiting component; 251. Inner nut; 252. Outer shell; 260. Adjusting component; 270. Lateral connecting rod;

[0037] 300. Frame; 310. Mounting base; 311. Mounting hole; 320. Locking element; 321. Locking part; 322. Operating part; 330. Anti-detachment element; 340. Underframe; 341. Longitudinal bar; 342. Crossbar; 350. Side frame; 360. Lateral connector; 370. Push handle; 380. Tow bar; 390. Rear wheel. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] refer to Figures 1 to 3This application provides a handcart with replaceable front wheels, hereinafter referred to as handcart 1000. Handcart 1000 includes a frame 300, a first front wheel assembly 100, and a second front wheel assembly 200. The front of the frame 300 is provided with two mounting seats 310, each with mounting holes 311. Two rear wheels 390 are mounted on the rear side of the frame 300. The first front wheel assembly 100 and the second front wheel assembly 200 can be mounted on the front of the frame 300 as needed, as detailed below:

[0043] like Figure 1 and Figure 2 As shown, the first front wheel assembly 100 includes a first wheel body 110 and a first wheel seat 120. The first wheel seat 120 has a vertical first connecting shaft 121. The first wheel body 110 can rotate omnidirectionally around the vertical first connecting shaft 121 (i.e., the first front wheel assembly 100 is an omnidirectional wheel). The first connecting shaft 121 is inserted into the mounting hole 311. Since there are two mounting seats 310, there are also two corresponding first front wheel assemblies 100. When the first front wheel assembly 100 is installed, the handcart 1000 is in the first mode, which can also be called the four-wheel mode. At this time, the handcart 1000 can turn flexibly during movement.

[0044] like Figure 3 As shown, the second front wheel assembly 200 includes a second wheel body 210 and two connecting arms 220. The two connecting arms 220 are arranged on both sides of the second wheel body 210. One end of the connecting arm 220 is connected to the second wheel body 210, and the other end is provided with a vertical second connecting shaft 221. The two second connecting shafts 221 of the two connecting arms 220 are respectively inserted into the mounting holes 311 of the two mounting seats 310. After installation, the handcart 1000 is in the second mode, which can also be called the three-wheel mode. In this mode, the second wheel body 210 is a universal wheel, providing another way of pushing; or the second wheel body 210 is a directional wheel, in which the handcart 1000 can rotate and move in the same direction, that is, the handcart 1000 can move in a straight line.

[0045] Therefore, the handcart of this application can be equipped with two first front wheel assemblies or one second front wheel assembly according to user needs, and the first and second front wheel assemblies are adapted to the same mounting base, which is convenient to use. Specifically, it reduces the learning cost of assembly and disassembly, and at the same time reduces the manufacturing cost.

[0046] This application provides one structure of a frame 300, which includes a base frame 340, side frames 350 disposed on both sides of the base frame 340, a transverse connector 360 disposed between the two side frames 350, and a push handle 370 connected between the two side frames. A mounting base 310 is disposed at the front of the base frame 340, and a rear wheel 390 is mounted at the rear of the base frame 340. The transverse connector 360 can be one or more rods. The handcart 1000 also includes a cloth cover (not shown), which is fitted over the base frame 340, side frames 350, and transverse connector 360, forming an accommodating space inside.

[0047] The base frame 340 includes two longitudinal bars 341 extending in the front-rear direction, and multiple crossbars 342 disposed between the two longitudinal bars 341. A mounting base 310 is disposed on the front crossbar 342. In the illustration, the crossbar 342 is a square tube, and the mounting base 310 has a U-shaped groove adapted to the crossbar 342. During installation, the U-shaped groove vertically engages with the crossbar 342, facilitating assembly and ensuring the correct orientation of the mounting holes 311. The mounting base 310 and the crossbar 342 are also connected by fasteners to improve connection strength.

[0048] See Figure 4 and Figure 5 In one embodiment, the handcart 1000 also includes a detachable tow bar 380 mounted on the base frame 340, which is used to hang on the rear of a bicycle, motorcycle, etc. After the tow bar 380 is installed, the handcart 1000 needs to be switched to a four-wheel swivel mode, a three-wheel swivel mode, or the front wheel assembly needs to be removed.

[0049] See Figure 6 and Figure 7 In one embodiment, the mounting base 310 includes a locking member 320 for locking the first connecting shaft 121 and the second connecting shaft 221. The locking member 320 is slidably disposed on the mounting base 310 and has a locking state acting on the first connecting shaft 121 or the second connecting shaft 221, and an unlocking state to release the locking action. In the unlocking state, the first connecting shaft 121 or the second connecting shaft 221 is allowed to separate from the mounting base 310 to complete the disassembly operation. An elastic member, which may be a spring (not shown in the figure), is provided within the mounting base 310 to act on the locking member 320 and keep it in the locked state. The sliding direction of the locking member 320 is perpendicular to the extending direction of the mounting hole 311.

[0050] Appendix Figure 7Taking the second connecting shaft 221 as an example, the first connecting shaft 121 has the same structure as the second connecting shaft 221. The locking member 320 shown in the figure has a locking part 321 and an operating part 322. The operating part 322 is exposed outside the mounting base 310 for pressing operation. The locking part 321 cooperates with either the first connecting shaft 121 or the second connecting shaft 221. Specifically, the first connecting shaft 121 and the second connecting shaft 221 have radially inward-retracting annular grooves 130. In the locked state, the locking part 321 extends into the annular groove 130; in the unlocked state, the locking part 321 exits the annular groove 130.

[0051] In this embodiment, the locking member 320 slides in the direction of disengaging from the mounting base 310 under the action of the elastic member. In one embodiment, the mounting base 310 is movably provided with an anti-disengagement member 330 that acts to restrict the locking member 320 from disengaging from the mounting base 310.

[0052] See Figure 3 , Figure 8 and Figure 9 Two mounting bases 310 are respectively arranged adjacent to the width direction of the frame. In one embodiment, a connecting arm 220 is connected to the end of the axle 211 of the second wheel body 210. The connecting arm 220 has a straight section 222 and a bent section 223. One end of the straight section 222 is connected to the second wheel body 210, and the bent section 223 extends along the width direction and has a second connecting shaft 221. A transverse connecting rod 270 is provided between the two connecting arms 220. The end of the transverse connecting rod 270 is connected at the junction of the straight section 222 and the bent section 223, and the connection method is welding or the like.

[0053] The connecting arm 220 is tubular, preferably a round tube. When the second wheel 210 is a directional wheel, a fixed seat 230 and a movable seat 240 are respectively provided at both ends of the axle of the second wheel 210. The fixed seat 230 is fixedly connected to one of the connecting arms 220, and the movable seat 240 is partially inserted into the other connecting arm 220 and slides with the connecting arm 220 along an axial direction (the axial direction of the straight section 222). The handcart 1000 also includes a limiting member 250 movably disposed in the movable seat 240, and an adjusting member 260 passing through the connecting arm 220 and the limiting member 250 radially (radial direction of the straight section 222). An inclined surface is provided between the limiting member 250 and the movable seat 250. The limiting member 250 specifically includes an inner nut 251 nested inside and outside and a housing 252. The aforementioned inclined surface is provided between the housing 252 and the movable seat 250. The adjusting component 260 and the inner nut 251 are threaded together. The specific straightening operation is as follows: rotate the adjusting component 260, drive the limiting component 250 to slide radially through the thread, and then drive the movable seat 240 to slide axially through the inclined surface, thereby driving the second wheel 210 to rotate until the handcart 1000 can travel in a straight line in the second mode.

[0054] The handcart of this application can be equipped with two first front wheel assemblies or one second front wheel assembly according to user needs. The first and second front wheel assemblies are adapted to the same mounting base, which is convenient to use and reduces the learning cost of assembly and disassembly, while also reducing manufacturing costs.

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0056] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A handcart with replaceable front wheels, characterized in that, include: The frame has two mounting seats at its front, and the mounting seats have mounting holes. A first front wheel assembly, the first front wheel assembly including a first wheel body and a first wheel seat, the first wheel seat having a vertical first connecting shaft; The second front wheel assembly includes a second wheel body and two connecting arms. One end of each connecting arm is connected to the second wheel body, and the other end is provided with a vertical second connecting shaft. The handcart has a first mode and a second mode. In the first mode, the first connecting shaft is inserted into the mounting hole, and the first wheel can rotate omnidirectionally around the vertical first connecting shaft. In the second mode, the second connecting shaft is inserted into the mounting hole.

2. The handcart with replaceable front wheels according to claim 1, characterized in that, The second wheel can only rotate and move in the same direction, supported by the two connecting arms.

3. The handcart according to claim 1, characterized in that, The mounting base has a locking element that locks the first connecting shaft and the second connecting shaft.

4. The handcart according to claim 3, characterized in that, The locking member is slidably disposed on the mounting base. The locking member has a locking part that cooperates with the first connecting shaft and the second connecting shaft, and an operating part. The first connecting shaft and the second connecting shaft have radially inwardly retracting annular grooves. In the locked state, the locking part extends into the annular grooves.

5. The handcart according to claim 2, characterized in that, The connecting arm is connected to the axle end of the wheel body.

6. The handcart according to claim 1, characterized in that, A transverse connecting rod is provided between the two connecting arms.

7. The handcart according to claim 1, characterized in that, The frame includes a base frame, side frames disposed on both sides of the base frame, a transverse connector arranged between the two side frames, and a push handle connected between the two side frames; the mounting base is disposed at the front of the base frame.

8. The handcart according to claim 7, characterized in that, The base frame includes two longitudinal bars extending in the front-rear direction, and multiple transverse bars disposed between the two longitudinal bars, with the mounting base disposed on the transverse bars at the front.

9. The handcart according to claim 8, characterized in that, The crossbar is a square tube, and the mounting base has a U-shaped groove adapted to the crossbar.

10. The handcart according to claim 2, characterized in that, The second wheel body has a fixed seat and a movable seat at both ends of the axle. The fixed seat is fixedly connected to one of the connecting arms, and the movable seat is partially inserted into the other connecting arm and slides with the connecting arm along an axial direction. The handcart also includes a limiting member movably disposed within the movable seat, and an adjusting member that radially penetrates the connecting arm and the limiting member. An inclined surface is provided between the limiting member and the movable seat. The adjusting member is used to drive the limiting member to move radially to adjust the rotation amplitude of the second wheel.

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