Multi-functional Folding Travel Trailer

Abstract

The present invention relates to a folding bicycle, in particular to a multifunctional folding travel trailer. It includes a frame and wheels. The frame includes a front frame, a rear frame and an adjustable longitudinal frame. The front frame, the rear frame and the adjustable longitudinal frame are all rectangular. Wheels are installed at both ends of the bottom of the front frame. The lower end of the rear frame is hinged to the lower end of the front frame. The front frame and the rear frame are in a V shape. The rear end of the adjustable cross beam is hinged to the upper end of the rear frame. The middle part of the adjustable longitudinal frame is detachably connected to the upper end of the front frame; a flexible load-bearing member is installed between the lower cross bar of the front frame and the upper cross bar of the rear frame. The flexible load-bearing member is in a U shape. A multi-purpose chassis is installed above the bottom of the flexible load-bearing member. The chassis is detachably connected to the lower cross bar of the front frame. Variable-angle leg devices are provided on both sides of the upper end of the rear frame; a connector is provided on the towing cross bar of the adjustable longitudinal frame. The present invention can be folded, is convenient to carry, has multiple functions, can be used as a trailer, a shopping cart and a reclining chair, has few parts and low cost.

Description

Technical Field

[0001] The invention relates to a folding vehicle, in particular to a multifunctional folding travel trailer. Background Art

[0002] At present, cycling has gained popularity as a way of exercising, especially long-distance cycling, which not only exercises the body but also enjoys the beauty of travel. For long-distance cycling enthusiasts, they need to carry some necessities, but due to the structural limitations of the cycling bicycle, only a small part of the necessities can be carried in a backpack. The bicycle trailers sold on the market have a single function and cannot be folded. In addition to using the bicycle, it is not convenient to carry it in other ways, and more necessities, such as outdoor rest furniture, cannot be carried. Long-distance cycling enthusiasts cannot fully rest when they rest because they cannot carry outdoor rest furniture. Summary of the invention

[0003] The present invention aims to solve the above technical problems and provides a multifunctional foldable travel trailer which can be folded, is easy to carry and realizes multiple functions.

[0004] The present invention solves the technical problem and adopts the following technical solution:

[0005] A multifunctional folding travel trailer comprises a frame and wheels. The frame comprises a front frame, a rear frame and an adjustable longitudinal frame. The front frame, the rear frame and the adjustable longitudinal frame are all rectangular. Wheels are installed at both ends of the bottom of the front frame. The lower end of the rear frame is hinged to the lower end of the front frame. The front frame and the rear frame are in a V shape. The rear end of the adjustable crossbeam is hinged to the upper end of the rear frame. The middle part of the adjustable longitudinal frame is detachably connected to the upper end of the front frame. A flexible load-bearing member is installed between the upper crossbar of the front frame and the upper crossbar of the rear frame. The flexible load-bearing member is in a U shape. A multi-purpose chassis is installed above the bottom of the flexible load-bearing member. The chassis is detachably connected to the lower crossbar of the front frame. Both sides of the upper end of the rear frame are provided with angle-changing leg devices. The front crossbar of the adjustable longitudinal frame is provided with a connector.

[0006] Compared with the prior art, the present invention using the above technical solution has the following beneficial effects:

[0007] The utility model can be folded, is easy to carry, has multiple functions, can be used as a trailer, a shopping cart and a reclining chair, has few parts and is low in cost.

[0008] Further, the optimization scheme of the present invention is:

[0009] The flexible load-bearing member is a nylon belt or a high-strength fiber belt. One end of the flexible load-bearing member is fixedly connected to the upper cross bar of the rear frame, and the other end of the flexible load-bearing member is connected to the upper cross bar of the front frame by a Velcro, and a handle is provided on the inner side of the Velcro.

[0010] U-shaped groove structures for longitudinal rod limit of the adjustable longitudinal frame are provided at the upper ends of both the front frame and the rear frame. A positioning pin is provided in the U-shaped groove of the front frame, and multiple positioning holes for cooperating with the positioning pin are provided on the longitudinal rod of the adjustable longitudinal frame.

[0011] The adjustable longitudinal frame includes a longitudinal rod and a traction cross bar. The longitudinal rod includes a fixed rod and a movable rod. The movable rod is sleeved on the fixed rod. A spring pin is installed on the fixed rod, and multiple pin holes for cooperating with the spring pin are provided on the movable rod.

[0012] The variable-angle support leg device includes a fixed box body, a support leg, a spring, a pin shaft, a retaining pin and a universal wheel. The fixed box body is fan-shaped and is welded on the outside of the rear frame. Multiple U-shaped positioning grooves are provided at the edges of the arc-shaped parts on both sides of the fixed box body. The upper end of the support leg is placed inside the fixed box body and is hinged to the fixed box body through a pin shaft. An axial long groove structure is provided on the upper part of the support leg, and the pin shaft is located in the long groove structure. A radial retaining pin is provided in the middle of the support leg, and the retaining pin is placed in the positioning groove. A tension spring is installed between the retaining pin and the pin shaft. A connecting rod is provided between the support legs on both sides.

[0013] A tray is provided between the upper cross bar of the front frame and the traction cross bar of the adjustable longitudinal frame. The tray is detachably connected to the front frame and the adjustable longitudinal frame respectively.

[0014] The multi-purpose chassis includes a panel, a frame, front support feet, rear support feet, a left baffle, a right baffle and baffle fixing pieces. The panel is rectangular and is placed inside the frame. The front support feet and the rear support feet in the shape of H are respectively hinged at both ends of the bottom surface of the frame. The front support feet and the rear support feet are telescopic structures. Pipe clamp seats are respectively sleeved on the cross braces of the front support feet and the rear support feet. The pipe clamp seats are hinged to connecting seats, and the connecting seats are rotationally connected to one end of the longitudinal braces. The inner ends of the two longitudinal braces are connected by threads; baffles are respectively hinged on both sides of the frame, and fixing seats are provided at both ends of the bottom surface of the frame. The fixing seats are hinged to fixing pieces for fixing the baffles.

[0015] The connector includes a connecting ear, an OX-shaped connecting ring and a connecting pipe seat clamp. The connecting ear includes an ear plate part and two circular ring parts. The circular ring parts are sleeved on the traction cross bar. A fixing ring is provided between the two circular ring parts, and the fixing ring is fixedly connected to the traction cross bar; the front end of the connecting pipe seat clamp is fixedly connected to the seat shaft of the vehicle seat. The rear part of the connecting pipe seat clamp is clamped on both sides of the O-shaped connecting ring, and the X-shaped connecting ring is connected to the connecting ear.

[0016] A mudguard is provided above the wheel. The mudguard is in the shape of a groove. One end of the inner side plate is hinged to the vertical rod of the front frame, and a card slot is provided at the other end of the inner side plate. The card slot is clamped with the card shaft of the rear frame.

[0017] The adjustable longitudinal frame is connected to the front frame through a locking device. The locking device includes an arc-shaped pressing plate and a spring buckle. The inner end of the arc-shaped pressing plate is connected to the front frame through a hinge. The outer end of the arc-shaped pressing plate cooperates with the spring buckle. The spring buckle is installed on the outside of the front frame. A shock pad is provided between the arc-shaped pressing plate and the longitudinal rod of the adjustable longitudinal frame, and the shock pad is fixedly connected to the longitudinal rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall schematic diagram of the trailer state of an embodiment of the present invention;

[0019] Figure 2 is Figure 1 the top view of;

[0020] Figure 3 is Figure 1 the right view of;

[0021] Figure 4 is Figure 1 the schematic diagram of the baffle storage of the multi-purpose chassis in the trailer state of;

[0022] Figure 5 is Figure 4 the top view;

[0023] Figure 6 the overall frame structure schematic diagram of an embodiment of the present invention;

[0024] Figure 7 is Figure 6 the top view of;

[0025] Figure 8 is Figure 7 the A-A cross-sectional view of;

[0026] Figure 9 is the connection schematic diagram of the front frame, rear frame and adjustable longitudinal frame of an embodiment of the present invention;

[0027] Figure 10 is the front view of the front frame of an embodiment of the present invention;

[0028] Figure 11 is Figure 10 the left view of;

[0029] Figure 12 is the front view of the rear frame of an embodiment of the present invention;

[0030] Figure 13 is Figure 12 the left view of;

[0031] Figure 14 is the front view of the adjustable longitudinal frame of an embodiment of the present invention;

[0032] Figure 15 is Figure 14 the top view of;

[0033] Figure 16 the storage schematic diagram of the multi-purpose chassis of an embodiment of the present invention;

[0034] Figure 17Schematic diagram of the baffle unfolding of the multi-purpose chassis according to an embodiment of the present invention;

[0035] Figure 18 Schematic diagram of the leg unfolding of the multi-purpose chassis according to an embodiment of the present invention;

[0036] Figure 19 Is Figure 18 Left view;

[0037] Figure 20 Front view of the variable-angle leg device according to an embodiment of the present invention;

[0038] Figure 21 Is Figure 20 B-B view of;

[0039] Figure 22 Is Figure 21 C-C view of;

[0040] Figure 23 Front view of the tray according to an embodiment of the present invention;

[0041] Figure 24 Is Figure 23 Top view of;

[0042] Figure 25 Front view of the connector according to an embodiment of the present invention;

[0043] Figure 26 Is Figure 25 Top view of;

[0044] Figure 27 Overall folding schematic diagram according to an embodiment of the present invention;

[0045] Figure 28 Schematic diagram of the present invention as a reclining chair and a reclining stool;

[0046] Figure 29 Schematic diagram of the present invention as a shopping cart;

[0047] Figure 30 Schematic diagram of the present invention as a reclining chair and a dining table;

[0048] Figure 31 Schematic diagram of the trailer state for carrying goods according to an embodiment of the present invention;

[0049] Figure 32 Schematic diagram of the trailer state for carrying people according to an embodiment of the present invention.

[0050] In the figure: Wheel 1; Axle 1-1; Fender 1-2; Clamping shaft 1-3; Front frame 2; Upper cross bar 2-1; Lower cross bar 2-2; Vertical bar 2-3; Clamping bracket 2-4; U-shaped groove 2-5; Positioning pin 2-6; Ear seat 2-7; Bolt 2-8; Pressure plate 2-9; Spring buckle 2-10; Rear frame 3; Hinge shaft 3-1; Clamping shaft 3-2; Adjustable longitudinal frame 4; Fixed rod 4-1; Movable rod 4-2; Towing cross bar 4-3; Spring pin 4-4; First pin hole 4-5; Second pin hole 4-6; Flexible load-bearing member 5; Handle 5-1; Multi-purpose chassis 6; Panel 6-1; Frame 6-2; Front support leg 6-3; Rear support leg 6-4; Left baffle 6-5; Right baffle 6-6; Hook-and-loop fastener 6-7; Fixed piece 6-8; Fixed piece seat 6-9; Cross brace 6-10; Pipe clamp seat 6-11; Connecting seat 6-12; Longitudinal brace 6-13; Connecting shaft 6-14; Variable-angle support leg device 7; Fixed box body 7-1; Support leg 7-2; Tension spring 7-3; Pin shaft 7-4; Locking pin 7-5; Universal wheel 7-6; Box cover 7-7; Connecting rod 7-8; Tray 8; Tray frame 8-1; Tray body 8-2; Upper horizontal pipe 8-3; Rear horizontal pipe 8-4; Elastic pin 8-5; Connector 9; Connecting pipe clamp seat 9-1; OX-shaped connecting ring 9-2; Connecting ear 9-3; Ear plate part 9-3-1; Ring part 9-3-2; Fixed ring 9-3-3; Storage box 10. Detailed implementation mode

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] See Figure 1 、 Figure 2 、 Figure 3 This embodiment is a multi-functional folding travel trailer, which is composed of a wheel 1, a front frame 2, a rear frame 3, an adjustable longitudinal frame 4, a variable-angle support leg device 7, a multi-purpose chassis 6, etc. The front frame 2 is a rectangular welded member ( Figure 10 、 Figure 11 as shown), and the material is ordinary steel pipe or stainless steel pipe. It is composed of an upper cross bar 2-1, a lower cross bar 2-2 and two vertical bars 2-3. The lower cross bar 2-2 is located inside the lower ends of the two vertical bars 2-3. A wheel 1 is installed at the lower end of each vertical bar 2-3, and the wheel 1 is connected to the vertical bar 2-3 through an axle 1-1. A U-shaped groove 2-5 is provided at the upper end of each vertical bar 2-3. The U-shaped groove 2-5 is composed of two parallel steel plates, and the two steel plates are respectively welded on the left and right sides of the vertical bar 2-3. A sealing plate is welded to the upper end of the vertical bar 2-3, and a vertical positioning pin 2-6 is welded to the sealing plate. An ear seat 2-7 is welded to the rear side of the lower end of each vertical bar 2-3, a radial bolt 2-8 is welded to the middle of the lower cross bar 2-2, and a strip-shaped clamping bracket 2-4 is welded below the ear seat 2-7. The clamping bracket 2-4 is located inside the vertical bar 2-3.

[0053] The rear frame 3 ( Figure 12 、 Figure 13The lower end of the (as shown) is hinged to the ear seat 2-7 of the front frame 2 through a hinge shaft 3-1. The structure of the rear frame 3 is the same as that of the front frame 2. U-shaped grooves 2-5 are respectively provided at the upper ends of the two vertical rods 2-1 of the rear frame 3. The front frame 2 and the rear frame 3 are in a V shape. The rear end of the adjustable longitudinal frame 4 is hinged to the U-shaped groove 2-5 of the rear frame 3. The adjustable longitudinal frame 4 is U-shaped. The adjustable longitudinal frame 4 ( Figure 14 , Figure 15 as shown) is composed of longitudinal rods and a traction cross bar 4-3, etc. The longitudinal rods are composed of a fixed rod 4-1 and a movable rod 4-2. The rear ends of the two fixed rods 4-1 are hinged to the U-shaped groove 2-5 of the rear frame 3. The two movable rods 4-2 are respectively sleeved on the fixed rods 4-1. Each fixed rod 4-1 is provided with a spring pin 4-4. The movable rod 4-2 is provided with two pin holes that cooperate with the spring pin 4-4, namely a first pin hole 4-5 and a second pin hole 4-6. The front end of the movable rod 4-2 is provided with a traction cross bar 4-3. The two ends of the traction cross bar 4-3 are respectively fixedly connected to the movable rod 4-2 through pipe seat connectors. The front frame 2, the rear frame 3 and the adjustable longitudinal frame 4 are in a triangular shape ( Figure 6 , Figure 7 , Figure 8 , Figure 9 as shown). The middle part of the movable rod 4-2 of the adjustable longitudinal frame 4 is placed in the U-shaped groove 2-5 of the front frame 2. The adjustable longitudinal frame 4 is fixed through a locking device. The locking device is composed of a pressing plate 2-9 and a spring buckle 2-10. The inner side plate of the U-shaped groove 2-5 is connected to the arc-shaped pressing plate 2-9 through a hinge. The outer side plate of the U-shaped groove 2-5 is welded with the spring buckle 2-10. The spring buckle 2-10 is buckled on the pressing plate 2-9 to fix the adjustable longitudinal frame 4. The movable rod 4-2 of the adjustable longitudinal frame 4 is provided with two positioning holes that cooperate with the positioning pin 2-6, namely a first positioning hole and a second positioning hole. The first positioning hole is far from the traction cross bar 4-3. A shock pad is provided between the arc-shaped pressing plate 2-9 and the movable rod 4-2 of the adjustable longitudinal frame 4. The shock pad is fixedly connected to the movable rod 4-2 and corresponds to the first positioning hole.

[0054] A flexible load-bearing member 5 is installed between the upper cross bar 2-1 of the front frame 2 and the upper cross bar 2-1 of the rear frame. The flexible load-bearing member 5 is a nylon belt or a high-strength fiber belt. The flexible load-bearing member 5 is U-shaped. One end of the flexible load-bearing member 5 is connected to the upper cross bar 2-1 of the rear frame 3 through a connecting sleeve. The other end of the flexible load-bearing member 5 is connected to the upper cross bar 2-1 of the front frame 2 through a magic tape. A handle 5-1 is provided inside the magic tape. Above the bottom of the flexible load-bearing member 5, a multi-purpose chassis 6 is installed. A bolt 2-8 passes through the multi-flexible load-bearing member 5 and the multi-purpose chassis 6. A sheep's horn nut fixes the multi-purpose chassis 6.

[0055] The multi-purpose chassis 6 ( Figure 16 , Figure 17As shown in the figure, it is composed of a panel 6-1, a frame 6-2, front legs 6-3, rear legs 6-4, a left baffle 6-5, a right baffle 6-6, a sticky fastener 6-7, a fixing piece 6-8, a fixing piece seat 6-9, a cross brace 6-10, a pipe clamp seat 6-11, a connecting seat 6-12, a longitudinal brace 6-13 and a connecting shaft 6-14. The panel 6-1 is rectangular and is installed inside the frame 6-2. The material of the frame 6-2 is aluminum alloy angle steel. Two front legs 6-2 and two rear legs 6-3 are respectively hinged at the four corners of the inner surface of the horizontal part of the frame 6-2. The front legs 6-2 and the rear legs 6-3 are telescopic structures, and each leg is composed of a movable rod and a fixed sleeve. The heights of the front legs 6-2 and the rear legs 6-3 can be adjusted. Cross braces 6-10 are respectively arranged between the two front legs 6-2 and the two rear legs 6-3. The cross braces 6-10 are respectively sleeved with pipe clamp seats 6-11. The pipe clamp seats 6-11 can move on the cross braces 6-10. The pipe clamp seats 6-11 are hinged to the connecting seats 6-12. The connecting seats 6-12 are rotationally connected to one end of the longitudinal braces 6-13 through a connecting shaft 6-14. The inner ends of the two longitudinal braces 6-13 are connected by threads. The left baffle 6-5 and the right baffle 6-6 are respectively installed on both sides of the frame 6-2. The left baffle 6-5 and the right baffle 6-6 are evenly distributed with round holes. The left baffle 6-5 and the right baffle 6-6 are connected to the frame 6-2 through hinges. Fixed seats 6-9 are arranged at both ends of the bottom surface of the frame 6-2. The fixed seats 6-9 are hinged to the fixing pieces 6-9. The fixing pieces 6-9 are used to fix the left baffle 6-5 and the right baffle 6-6. The multi-purpose chassis 6 is used as a dining table or a reclining stool after being unfolded ( Figure 18 、 Figure 19 as shown in the figure).

[0056] When the multi-purpose chassis 6 is installed on the vehicle frame, it is used as a chassis. The items carried during cycling are placed on the multi-purpose chassis 6. When there are more small items carried, the left baffle 6-5 and the right baffle 6-6 on both sides are opened. The upper ends of the left baffle 6-5 and the right baffle 6-6 are connected to the adjustable longitudinal frame through a sticky fastener 6-7 to prevent smaller items from falling; when there are no small items in the trailer ( Figure 4 、 Figure 5 as shown in the figure), the left baffle 6-5 and the right baffle 6-6 are laid flat, and large items or storage boxes are placed on the left baffle 6-5 or the right baffle 6-6.

[0057] Variable-angle leg devices 7 are provided on both sides of the upper end of the rear frame 3 ( Figure 20 、 Figure 21 、 Figure 22As shown in the figure, the variable-angle outrigger device 7 is composed of a fixed box body 7-1, outriggers 7-2, tension springs 7-3, pin shafts 7-4, detent pins 7-5, casters 7-6, a box cover 7-7, a connecting rod 7-8, etc. The fixed box body 7-1 is fan-shaped and is welded to the outside of the U-shaped groove 2-5 of the rear frame 3. Multiple U-shaped positioning grooves are provided at the edges of the arc-shaped parts on both sides of the fixed box body 7-1. The upper end of the outrigger 7-2 is placed inside the fixed box body 7-1 and is hinged to the fixed box body 7-1 through the pin shaft 7-3. The upper end of the outrigger 7-2 is provided with an axial long groove structure, and the pin shaft 7-3 is located inside this long groove structure. A radial detent pin 7-5 is provided in the middle and upper part of the outrigger 7-2, and the detent pin 7-5 is placed in the positioning groove. A tension spring 7-3 is installed between the detent pin 7-5 and the pin shaft 7-4. A connecting rod 7-8 is welded between the outriggers 7-2 on both sides, and the connecting rod 7-8 can also function as a bumper. Pull the outrigger 7-2 outwards to make the detent pin 7-5 located in different positioning grooves to adjust the angle of the outrigger 7-2. The box cover 7-7 is installed on the inner side of the fixed box body 7-1.

[0058] A tray 8 is provided between the upper cross bar 2-1 of the front frame 2 and the towing cross bar 4-3 of the adjustable longitudinal frame 4 ( Figure 23 、 Figure 24 As shown in the figure). The tray 8 is composed of a tray frame 8-1, a tray body 8-2, etc. The tray frame 8-1 is a welded member, and the material is a round tube. The side is L-shaped. The horizontal tray body 8-2 is installed inside the tray frame 8-1. Flanging structures are provided upwards on the four sides of the tray body 8-2. Elastic pins 8-5 are respectively installed at both ends of the upper cross tube 8-3 and the rear cross tube 8-4 of the tray frame 8-1. The tray frame 8-1 is connected to the movable rod 4-2 of the adjustable longitudinal frame 4 through the two elastic pins 8-5 at its front end, and the tray frame 8-1 is connected to the inner side plate of the U-shaped groove 2-5 of the front frame 2 through the two elastic pins 8-5 at its rear end.

[0059] The towing cross bar 4-3 of the adjustable longitudinal frame 4 is provided with a connector 9 ( Figure 25 、 Figure 26 As shown in the figure). The connector 9 is composed of a connecting pipe clamp seat 9-1, an OX-shaped connecting ring 9-2, a connecting ear 9-3, etc. The OX-shaped connecting ring 9-2 is composed of an O-shaped connecting ring and an X-shaped connecting ring. The connecting ear is composed of an ear plate part 9-3-1 and two circular ring parts 9-3-2. The circular ring parts 9-3-2 are sleeved on the towing cross bar 4-3. A fixing ring 9-3-3 is provided between the two circular ring parts 9-3-2. The fixing ring 9-3-3 and the towing cross bar 4-3 are fixed through a setscrew. The front end of the connecting pipe seat clamp 9-1 is fixedly connected to the seat shaft of the vehicle seat. The rear part of the connecting pipe seat clamp 9-1 is clamped on both sides of the O-shaped connecting ring. The X-shaped connecting ring is connected to the connecting ear 9-3.

[0060] Above the wheel 1, there is a mudguard 1-2. The mudguard 1-2 is in a groove shape. One end of its inner side plate is hinged to the vertical rod 2-3 of the front frame 2, and a card slot is provided at the other end of its inner side plate. This card slot is clamped with the card shaft 3-2 of the rear frame 3.

[0061] This embodiment can be folded as a whole ( Figure 27 as shown). Loosen the spring buckle 2-10, move the rear frame 3 closer to the front frame 2. After the adjustable longitudinal frame 4 is shortened and then moved closer to the rear frame 3, wrap it tightly with the flexible load-bearing belt 5 for easy carrying, and it can be placed in the trunk of a private car.

[0062] When a cycling enthusiast is on a long-distance ride, connect the trailer to the seat shaft of a bicycle or an electric vehicle through the connector 9, place the items in the storage box 10, and then put the storage box 10 into the trailer ( Figure 31 as shown). When taking a break during the ride, take out the storage box 10 in the trailer, remove the multi-purpose chassis 6, unfold the multi-purpose chassis 6, and adjust the front support feet 6-3 and the rear support feet 6-4 so that the front support feet 6-3 and the rear support feet 6-4 are in the low position to form a reclining chair ( Figure 28 as shown); move the card slot of the mudguard 1-2 out of the card shaft 3-2 and rotate it towards the front frame 2, loosen the spring buckle 2-10, pull out the movable rod 4-2 of the adjustable longitudinal frame 4 outward, and then connect the adjustable longitudinal frame 4 to the front frame 2 so that the rear frame 3 is in the bottom position. Adjust the angle of the variable-angle leg device 7 so that the universal wheel 7-6 supports the front end of the rear frame 3. The trailer is used as a reclining chair, and the cycling enthusiast can sit on it to rest. Place the unfolded reclining chair of the multi-purpose chassis 6 in front and rest with the legs on the reclining chair. When reaching the end of the ride and needing to return by train or car, fold the trailer as a whole and wrap it tightly with the flexible load-bearing belt 5, and it can be carried by train or car.

[0063] This embodiment can also be used as a reclining chair and a dining table ( Figure 30 as shown). When having a picnic outdoors, the trailer is used as a reclining chair, the multi-purpose chassis is unfolded, and the front support feet 6-3 and the rear support feet 6-4 are adjusted so that the front support feet 6-3 and the rear support feet 6-4 are in the high position to be used as a dining table. This embodiment can also be used as a shopping cart ( Figure 29 as shown). In the reclining chair state, fold and store the multi-purpose chassis 6 and place it horizontally on the flexible load-bearing belt 5. This embodiment can also carry people ( Figure 32 as shown), and the elderly or children can sit in the trailer.

[0064] The above are only the preferred and feasible embodiments of the present invention, and do not limit the scope of the rights of the present invention accordingly. Any equivalent structural changes made by using the content of the specification and drawings of the present invention are included within the scope of the rights of the present invention.

Claims

1. A multi-functional folding travel trailer, including a frame and wheels, Characterized in that: The frame includes a front frame, a rear frame and an adjustable longitudinal frame. The front frame, the rear frame and the adjustable longitudinal frame are all rectangular. Wheels are installed at both ends of the bottom of the front frame. The lower end of the rear frame is hinged to the lower end of the front frame. The front frame and the rear frame are in a V shape. The rear end of the adjustable longitudinal frame is hinged to the upper end of the rear frame. The middle part of the adjustable longitudinal frame is detachably connected to the upper end of the front frame; A flexible load-bearing member is installed between the upper cross bar of the front frame and the upper cross bar of the rear frame. The flexible load-bearing member is in a U shape. A multi-purpose chassis is installed above the bottom of the flexible load-bearing member. The chassis is detachably connected to the lower cross bar of the front frame. Angle-changing leg devices are provided on both sides of the upper end of the rear frame; A connector is provided on the towing cross beam of the adjustable longitudinal frame; U-shaped groove structures for longitudinal bar limit of the adjustable longitudinal frame are provided at the upper ends of both the front frame and the rear frame. A positioning pin is provided in the U-shaped groove of the front frame. Multiple positioning holes for cooperating with the positioning pin are provided on the longitudinal bar of the adjustable longitudinal frame; The adjustable longitudinal frame includes a longitudinal bar and a towing cross beam. The longitudinal bar includes a fixed bar and a movable bar. The movable bar is sleeved on the fixed bar. A spring pin is installed on the fixed bar. Multiple pin holes for cooperating with the spring pin are provided on the movable bar; The multi-purpose chassis includes a panel, a frame, front legs, rear legs, a left baffle, a right baffle and baffle fixing pieces. The panel is rectangular. The panel is placed inside the frame. H-shaped front legs and rear legs are respectively hinged at both ends of the bottom surface of the frame. The front legs and the rear legs are telescopic structures. Pipe clamp seats are respectively sleeved on the cross braces of the front legs and the rear legs. The pipe clamp seats are hinged to connecting seats. The connecting seats are rotationally connected to one end of the longitudinal braces. The inner ends of the two longitudinal braces are connected by threads; Baffles are respectively hinged on both sides of the frame. Fixed seats are provided at both ends of the bottom surface of the frame. The fixed seats are hinged to fixing pieces for fixing the baffles.

2. The multi-functional folding travel trailer according to claim 1, Characterized in that: The flexible load-bearing member is a nylon belt or a high-strength fiber belt. One end of the flexible load-bearing member is fixedly connected to the upper cross bar of the rear frame. The other end of the flexible load-bearing member is connected to the upper cross bar of the front frame through a hook-and-loop fastener. A handle is provided inside the hook-and-loop fastener.

3. The multi-functional folding travel trailer according to claim 1, Characterized in that: The angle-changing leg device includes a fixed box body, a leg, a spring, a pin shaft, a snap pin and a universal wheel. The fixed box body is fan-shaped and is welded on the outside of the rear frame. Multiple U-shaped positioning grooves are provided at the edges of the arc-shaped parts on both sides of the fixed box body. The upper end of the leg is placed inside the fixed box body and is hinged to the fixed box body through a pin shaft. An axial long groove structure is provided on the upper part of the leg. The pin shaft is located in the long groove structure. A radial snap pin is provided in the middle of the leg. The snap pin is placed in the positioning groove. A tension spring is installed between the snap pin and the pin shaft. A connecting rod is provided between the two legs on both sides.

4. The multi-functional folding travel trailer according to claim 1, Characterized in that: A tray is provided between the upper cross bar of the front frame and the towing cross beam of the adjustable longitudinal frame. The tray is detachably connected to the front frame and the adjustable longitudinal frame respectively.

5. The multi-functional folding travel trailer according to claim 1, Characterized in that: The connector includes a connecting ear, an OX-shaped connecting ring, and a connecting pipe seat clip. The connecting ear includes an ear plate portion and two circular ring portions. The circular ring portions are sleeved on the traction cross bar, and a fixing ring is provided between the two circular ring portions. The fixing ring is fixedly connected to the traction cross bar. The front end of the connecting pipe seat clip is fixedly connected to the seat shaft, the rear portion of the connecting pipe seat clip is clamped on both sides of the O-shaped connecting ring, and the X-shaped connecting ring is connected to the connecting ear.

6. The multi-functional folding travel trailer according to claim 1, characterized in that: A fender is provided above the wheel. The fender is in a groove shape. One end of the inner side plate thereof is hinged to the vertical rod of the front frame, and a card slot is provided at the other end of the inner side plate. The card slot is clamped with the card shaft of the rear frame.

7. The multi-functional folding travel trailer according to claim 1, characterized in that: The adjustable longitudinal frame is connected to the front frame through a locking device. The locking device includes an arc-shaped pressing plate and a spring buckle. The inner end of the arc-shaped pressing plate is connected to the front frame through a hinge. The outer end of the arc-shaped pressing plate cooperates with the spring buckle. The spring buckle is installed on the outer side of the front frame. A shock pad is provided between the arc-shaped pressing plate and the longitudinal rod of the adjustable longitudinal frame. The shock pad is fixedly connected to the longitudinal rod.

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