WO2024103287A1

WO2024103287A1 - Camping cart

Info

Publication number: WO2024103287A1
Application number: PCT/CN2022/132230
Authority: WO
Inventors: 陈校波; 高海宏; 叶轶坚
Original assignee: 浙江嘉立德运动科技有限公司
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2024-05-23

Abstract

A camping cart, comprising a lower support, an upper frame, and front inclined supports (1) and rear inclined supports (2) arranged between the upper frame and the lower support, wherein the lower support comprises a front support body (3) and a rear support body (4) that are hingedly connected together; the upper frame comprises a front frame body (5) and a rear frame body (6); the front portion of the front support body (3) is hingedly connected to the lower portions of the front inclined supports (1), and the rear portion of the rear support body (4) is hingedly connected to the lower portions of the rear inclined supports (2); adapters are connected between the front frame body (5) and the rear inclined supports (2), the front frame body (5) is hingedly connected to the adapters, the rear inclined supports (2) are secured and connected to the adapters, the rear frame body (6) is hingedly connected to the front inclined supports (1), and the upper portions of the front inclined supports (1) are hingedly connected to the adapters; connecting rods (8) are hingedly connected between the front inclined supports (1) and the front frame body (5), and between the rear inclined supports (2) and the rear frame body (6).

Description

A camping cart

Technical Field

The present invention relates to a folding vehicle, and more particularly to a camping cart.

Background technique

At present, with the improvement of people's living standards, outdoor camping is becoming more and more popular. In addition to tents, camping carts are also essential equipment for many people. The camping cart includes a frame and an inner liner connected to the frame. When the inner liner is fully unfolded with the frame, the storage space is large, which is convenient for storing and transporting items. In order to facilitate storage and carrying, many camping carts are now foldable, but they have complex structures and are inconvenient to fold and unfold.

Summary of the invention

In order to overcome the above-mentioned disadvantages, the present invention provides a camping cart which has a simple structure and is easy to fold and unfold.

In order to solve the above technical problems, the present invention adopts the following technical solutions: a camping cart, comprising a lower bracket, an upper frame, a front oblique frame and a rear oblique frame connected between the upper frame and the lower bracket, the lower bracket comprising a front frame body and a rear frame body hinged together, the upper frame comprising a front frame body and a rear frame body, the front part of the front frame body is hinged to the lower part of the front oblique frame, and the rear part of the rear frame body is hinged to the lower part of the rear oblique frame; an adapter is connected between the front frame body and the rear oblique frame, the front frame body is hinged to the adapter, the rear oblique frame is tightly connected to the adapter, the rear frame body is hinged to the front oblique frame, and the upper part of the front oblique frame is hinged to the adapter; connecting rods are hinged between the front oblique frame and the front frame, as well as between the rear oblique frame and the rear frame.

When the camping cart is in use, an inner liner is installed between the lower bracket and the upper frame for storing items. The front diagonal rod, the rear diagonal rod and the connecting rod play a good supporting role on the upper frame, ensuring the reliable support of the upper frame. When the camping cart is folded, the hinge position of the front frame and the rear frame is pulled upward, the lower ends of the front diagonal frame and the rear diagonal frame are close to each other, the front diagonal frame and the rear diagonal frame rotate and fold around the hinge position of the front diagonal frame and the adapter, and the connecting rod pulls the front frame and the rear frame to rotate and fold downward, and finally the hinge position of the front frame and the rear frame and the adapter are arched upward, the front end of the front frame and the rear end of the rear frame face downward, and the folding of the entire camping cart is completed. When the camping cart is unfolded and used, the front front frame and the rear end of the rear frame facing downward are pulled upward, and the linkage of the connecting rod and the adapter causes the front frame and the rear frame to unfold mutually, the front diagonal frame and the rear diagonal frame to unfold mutually, and the lower bracket and the upper frame are in a horizontal position to complete the unfolding. This camping cart has a simple structure and is easy to fold and unfold.

Preferably, the adapter is provided with an avoidance slot, and the upper part of the front oblique frame passes through the avoidance slot. The setting of the avoidance slot eliminates the need for staggered layout of the front oblique frame and the adapter inside and outside, which is beneficial to reducing the space occupied by the connection between the front oblique frame and the adapter. After the liner is installed, the adapter is more neatly positioned without a sense of dislocation.

Preferably, the adapter includes a horizontal portion and an inclined portion, which are connected together to form an L-shaped structure with an obtuse angle, the end of the horizontal portion is hinged to the front frame, the inclined portion is inclined downward from front to rear, and the end of the inclined portion is fastened to the rear diagonal frame.

The L-shaped adapter is fastened to the rear oblique frame to form a whole and then cross-hinged with the front oblique frame. It is stable and reliable when unfolded and convenient to fold.

Preferably, two hinged ears are provided at the front of the adapter, the end of the front frame is connected to the hinged head, the hinged head is connected between the two hinged ears, and the hinged head is rotatably connected to the hinged ears.

The hinged head is connected between the two hinged ears, and the connection is reliable. The hinged head and the hinged ears rotate with each other during folding and unfolding, and the stability is good.

Preferably, a socket is provided at the rear of the adapter, and the end of the rear oblique frame is inserted into the socket.

The rear oblique frame and the adapter are firmly connected by plug-in, which is convenient for assembly.

Preferably, the upper end of the front oblique frame is connected to the front connecting head, the front end of the rear frame is connected to the rear connecting head, the front connecting head is provided with a front connecting seat, the rear connecting head is provided with a rear connecting seat, the front connecting seat and the rear connecting seat are staggered inside and outside, the front connecting seat and the rear connecting seat are fitted and hinged together, and the front oblique frame, front frame, rear oblique frame and rear frame are flush.

The front connecting seat and the rear connecting seat are staggered inside and outside to ensure that the front oblique frame and the rear frame can be flush after connection without staggering. The front oblique frame, front frame, rear oblique frame and rear frame are flush, and the inner tank is more neat after installation without any sense of misalignment.

Preferably, arc grooves and arc positioning strips are provided on the front connecting seat and the rear connecting seat. The arc positioning strip on the front connecting seat is installed in the arc groove on the rear connecting seat and slides, and the arc positioning strip on the rear connecting seat is installed in the arc groove on the front connecting seat and slides. The two arc positioning strips abut against each other to realize circumferential positioning of the front connecting seat and the rear connecting seat.

During the folding and unfolding process, the front connecting seat and the rear connecting seat rotate relative to each other, and during this process, the arc-shaped positioning strip slides in the arc-shaped groove, which is conducive to improving the stability of the rotation process of the two. The two arc-shaped positioning strips abut to achieve circumferential positioning of the front connecting seat and the rear connecting seat, preventing over-folding and unfolding.

Preferably, the rear end of the front frame is connected to the front support, and the front end of the rear frame is connected to the rear support. The front support is provided with two connecting ears, and the rear support is provided with a connecting plate protruding forward, the connecting plate is installed between the two connecting ears, and a pin is connected between the connecting plate and the connecting ears. The connecting ears are provided with inclined positioning surfaces toward the rear support end, and guide surfaces are provided on both sides of the connecting plate at the front end of the rear support. When the front frame and the rear frame are unfolded to a horizontal position, the positioning surfaces abut against the guide surfaces to achieve limiting.

During the folding and unfolding process, the connecting plate and the connecting ear rotate around the pin shaft. After being unfolded to the full extent, the positioning surface abuts against the guide surface to achieve limit positioning, thereby preventing the front frame and the rear frame from rotating further and unfolding too far.

Preferably, a lifting rod is installed at the lower part of the front oblique frame, the upper end of the lifting rod is connected to a handle, and a torsion spring is installed between the handle and the front oblique frame to make the upper part of the lifting rod close to the front frame.

The arrangement of the lifting rod and the handle facilitates the pushing and moving of the camping cart, and the installation of the torsion spring enables the lifting rod to be in an upright state.

Preferably, the front oblique frame and the rear oblique frame are both U-shaped structures, and both the front oblique frame and the rear oblique frame include two oblique rods and a support rod connected between the lower ends of the two oblique rods. A mounting seat is connected between the support rod and the oblique rod, and two mounting holes are provided on the mounting seat. The support rod and the oblique rod are respectively plugged and connected to the two mounting holes.

The U-shaped front and rear diagonal frames have a stable structure, and the mounting base facilitates the assembly of the support rods and the diagonal rods.

Preferably, the mounting seat is detachably connected to a wheel frame, and the wheel is mounted on the wheel frame.

The wheel frame is detachably arranged, and when the camping cart is folded, the wheel frame can be removed from the mounting seat for storage, thereby reducing the space required for storing the entire camping cart.

Preferably, a connecting pin is provided on the wheel frame, a connecting hole is provided on the mounting seat, a positioning ring groove is provided on the outer wall of the connecting pin, two limit rods which can be relatively moved are installed in the connecting hole, the connecting pin is adapted to be inserted in the connecting hole, and the positioning ring groove is clamped between the two limit rods.

After the connecting pin is inserted into the connecting hole, the positioning ring groove on the connecting pin is stuck between the two limit rods. The limit rods position the connecting pin so that the connecting pin can rotate but cannot move axially, ensuring the reliable installation of the wheel frame.

Preferably, the upper end of the connecting hole is connected to the positioning block, the positioning block is provided with a locking hole, and sliding holes are correspondingly provided on the inner wall of the locking hole and at both ends of the limit rod, the two ends of the limit rod are installed in the sliding holes and slide laterally along the sliding holes to adjust the spacing between the two limit rods, the locking hole is adapted to connect the cover cap, a return spring is installed between the cover cap and the positioning block, and inclined push guide grooves are correspondingly provided on the side walls of the cover cap and the limit block, the push guide grooves approach the middle from top to bottom, and the ends of the limit rods pass through the push guide grooves and the sliding holes in turn; the two limit rods are stuck in the positioning ring grooves, and a gap is provided between the upper end of the connecting pin and the top of the cover cap.

After the connecting pin is inserted into the connecting hole, the upper end of the connecting pin is placed in the lock hole on the positioning block, the cap is in the highest position, and the two limit rods are stuck in the positioning ring groove to achieve axial limit of the connecting pin. When the wheel frame needs to be disassembled, the cap is pressed down, and the push guide groove inclined on the cap pushes the limit rod to move, so that the two limit rods move away from each other, and the limit rod is separated from the positioning ring groove. At this time, the connecting pin can be easily pulled out of the connecting hole.

Preferably, the outer wall of the upper end of the connecting pin gathers from bottom to top to form a pushing surface. When the connecting pin is inserted into the connecting hole, the pushing surface presses against the limiting rod and can push the limiting rod to move, so that the limiting rod can be stuck in the positioning ring groove.

Preferably, the front frame and the rear frame each include two cross bars, a longitudinal bar connected between the two cross bars, an L-shaped adapter connected between the cross bars and the longitudinal bar, plugs are provided at both ends of the adapter, and the two plugs are respectively plugged and connected with the ends of the cross bars and the longitudinal bar. The front frame and the rear frame are both U-shaped structures, which are stable and reliable. The two plugs on the adapter are respectively connected with the cross bars and the longitudinal bar, which is convenient for assembly.

Preferably, a movable piston is installed on the front frame, an extension rod is connected to the piston, a linkage rod is hinged between the extension rod and the adapter, a piston cavity adapted to the piston is provided on the front frame, a ventilation flow channel connected to the piston cavity is provided on the front frame, a one-way exhaust valve plate is installed in the ventilation flow channel, and a preload spring is installed between the one-way exhaust valve plate and the ventilation flow channel; a push rod for pushing the one-way exhaust valve plate to move is installed on the front frame; when folded, the linkage rod pushes the piston to move, the air pressure in the piston cavity increases to push open the one-way exhaust valve plate, and the air in the piston cavity is discharged from the ventilation flow channel; when unfolded, the push rod is pushed, the push rod pushes the one-way exhaust valve plate to open, the piston moves in the opposite direction, and the air is drawn into the piston cavity.

During the folding process of the camping cart, the piston compresses the air in the piston cavity and discharges the air in the piston cavity. After folding to any position, due to the one-way opening performance of the one-way exhaust valve plate, the airflow cannot flow back into the piston cavity through the one-way exhaust valve plate position, and the piston cannot move in the reverse direction, thereby achieving reverse locking of the entire camping cart, and it will not automatically unfold after folding. When reverse unfolding is required, push the push rod, and the push rod pushes the one-way exhaust valve plate to open. At this time, the airflow can pass through the one-way exhaust valve plate position, and the piston can move in the reverse direction in the piston cavity. This structural setting enables the camping cart to be reversely locked at any position during the folding process. Compared with locking with a pin, the present application does not require alignment and positioning of the pin and the pin hole, and the operation is more convenient.

Preferably, a positioning sleeve is installed at the open end of the air flow channel on the front frame, an end cover is installed at the inner end of the positioning sleeve, a partition is provided inside the positioning sleeve, the push rod passes through the end cover and the partition, and the outer end of the push rod extends to the opening position of the outer end of the positioning sleeve, a positioning protrusion is provided on the push rod, a positioning spring is installed between the positioning protrusion and the end cover, and the positioning protrusion abuts against the partition.

The push rod is installed stably and reliably, and the positioning spring plays a positioning role on the push rod. The push rod extends to the opening end of the positioning sleeve to facilitate pressing and pushing the push rod.

Preferably, a guide column is provided on the one-way exhaust valve plate, and an inclined push surface is provided on the push rod, the push surface is in contact with the guide column, and the push rod moves the push surface to abut against the guide column to push the one-way exhaust valve plate to move.

During the movement of the push rod, the inclined push surface can push the guide column to move, thereby realizing the movement and opening of the one-way exhaust valve plate.

Preferably, a valve seat is installed in the ventilation flow channel and corresponding to the one-way exhaust valve plate, a plurality of valve holes are arranged on the valve seat, a plurality of ventilation slots are arranged on the edge of the one-way exhaust valve plate, and the one-way exhaust valve plate seals and covers the valve holes.

The one-way exhaust valve plate is separated from the valve seat, and the valve hole is connected with the ventilation slot hole to realize the circulation of air flow.

Preferably, the end of the extension rod is connected to the extension seat, the front frame is provided with a long slot for avoiding the extension seat, and one end of the linkage rod is hinged on the extension seat. The extension seat facilitates the connection of the linkage rod.

Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The camping cart has a simple structure and is easy to fold and unfold; (2) The front diagonal frame, the front frame, the rear diagonal frame and the rear frame are flush, and the inner liner is more neat after installation without any sense of misalignment; (3) The camping cart can be limited during folding and unfolding to prevent over-folding and unfolding; (4) The wheels can be detachably installed on the camping cart and can be removed when stored, which is beneficial to reducing the storage volume; (5) The wheels are installed on the camping cart to achieve axial positioning through the limit rod and the positioning ring groove, and the installation is reliable; when disassembling, only the cover cap needs to be pressed to pull out the entire wheel, which is convenient for disassembly; (6) The camping cart can be reversely locked at any position during folding. Compared with locking with a pin, the present application does not require alignment and positioning of the pin and the pin hole, and the operation is more convenient.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of the present invention;

FIG2 is a schematic structural diagram of the adapter position of the present invention;

3 is a schematic diagram of the connection structure between the positioning block and the connecting pin of the present invention;

FIG4 is a schematic diagram of the connection structure between the cap and the limiting rod of the present invention;

5 is a partial cross-sectional view of the connection pin position of the present invention;

FIG6 is a schematic structural diagram of the folding process of the present invention;

FIG7 is a side view of embodiment 2 of the present invention;

FIG8 is a partially enlarged schematic diagram of the position of the ventilation channel of Example 2 of the present invention;

In the figure: 1, front oblique frame, 2, rear oblique frame, 3, front frame body, 4, rear frame body, 5, front frame body, 6, rear frame body, 7, adapter, 8, connecting rod, 9, horizontal part, 10, inclined part, 11, avoidance slot, 12, hinge ear, 13, hinge head, 14, front connecting head, 15, rear connecting head, 16, front connecting seat, 17, rear connecting seat, 18, arc groove, 19, arc positioning strip, 20, front support, 21, rear support, 22, connecting ear, 23, connecting plate, 24, pin shaft, 25, positioning surface, 26, guide surface, 27, lifting rod, 28, handle, 29, mounting seat, 30, adapter, 31, wheel frame, 32, wheel, 33, connecting pin, 34, connecting hole, 35, positioning ring groove, 36, limit rod, 37, positioning block, 38, lock hole, 39 , sliding hole, 40, cover cap, 41, snap-on cover, 42, push guide groove, 43, push surface, 44, piston, 45, extension rod, 46, linkage rod, 47, piston chamber, 48, ventilation flow channel, 49, one-way exhaust valve plate, 50, preload spring, 51, push rod, 52, extension seat, 53, long groove, 54, positioning sleeve, 55, end cover, 56, partition, 57, positioning protrusion, 58, positioning spring, 59, guide column, 60, push surface, 61, valve seat, 62, valve hole, 63, ventilation groove hole, 64, extension column, 65, guide rod, 66, end plug.

Detailed ways

The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

Embodiment 1: A camping cart (see Figures 1 to 6), comprising a lower bracket, an upper frame, a front oblique frame 1 and a rear oblique frame 2 connected between the upper frame and the lower bracket, the lower bracket comprising a front frame body 3 and a rear frame body 4 hinged together, the upper frame comprising a front frame body 5 and a rear frame body 6, the front part of the front frame body being hinged to the lower part of the front oblique frame, and the rear part of the rear frame body being hinged to the lower part of the rear oblique frame; an adapter 7 is connected between the front frame body and the rear oblique frame, the front frame body is hinged to the adapter, the rear oblique frame is tightly connected to the adapter, the rear frame body is hinged to the front oblique frame, and the upper part of the front oblique frame is hinged to the adapter; a connecting rod 8 is hinged between the front oblique frame and the front frame body, and between the rear oblique frame and the rear frame body. The hinge position of the front frame body and the adapter, and the hinge position of the front oblique frame and the rear frame body are relatively arranged on both sides of the hinge position of the front oblique frame and the adapter.

The adapter includes a horizontal portion 9 and an inclined portion 10. The horizontal portion and the inclined portion are connected together to form an L-shaped structure with an obtuse angle. The end of the horizontal portion is hinged to the front frame. The inclined portion is inclined downward from the front to the rear. The end of the inclined portion is fastened to the rear oblique frame. The adapter is provided with an avoidance slot 11, and the upper part of the front oblique frame passes through the avoidance slot. The upper part of the front oblique frame is bent to form an L-shaped structure with an obtuse angle. The structure of the upper part of the front oblique frame is similar to that of the adapter.

The front of the adapter is provided with two hinged ears 12, the front frame end is connected to the hinged head 13, the hinged head is connected between the two hinged ears, and the hinged head is rotatably connected to the hinged ears. The rear of the adapter is provided with a socket, the end of the rear oblique frame is inserted into the socket, and the rear oblique frame and the adapter are fastened by screws.

The upper end of the front oblique frame is connected to the front connecting head 14, the front end of the rear frame is connected to the rear connecting head 15, the front connecting head is provided with a front connecting seat 16, the rear connecting head is provided with a rear connecting seat 17, the front connecting seat and the rear connecting seat are staggered inside and outside, the front connecting seat and the rear connecting seat are attached and hinged together, the front oblique frame, the front frame, the rear oblique frame, and the rear frame are flush. The front connecting seat and the rear connecting seat are both provided with an arc groove 18 and an arc positioning strip 19, the arc positioning strip on the front connecting seat is installed in the arc groove on the rear connecting seat to slide, the arc positioning strip on the rear connecting seat is installed in the arc groove on the front connecting seat to slide, and the two arc positioning strips abut to realize the circumferential positioning of the front connecting seat and the rear connecting seat.

The rear end of the front frame is connected to the front support 20, and the front end of the rear frame is connected to the rear support 21. The front support is provided with two connecting ears 22, and the rear support is provided with a connecting plate 23 protruding forward. The connecting plate is installed between the two connecting ears, and a pin 24 is connected between the connecting plate and the connecting ear. The connecting ear is provided with an inclined positioning surface 25 toward the rear support end, and both sides of the connecting plate at the front end of the rear support are provided with guide surfaces 26. When the front frame and the rear frame are unfolded to a horizontal position, the positioning surface abuts against the guide surface to achieve position limiting. A lifting rod 27 is installed at the lower part of the front oblique frame, and a handle 28 is connected to the upper end of the lifting rod. A torsion spring is installed between the handle and the front oblique frame to make the upper part of the lifting rod close to the front frame.

The front oblique frame and the rear oblique frame are both U-shaped structures, and both include two oblique rods, a support rod connected between the lower ends of the two oblique rods, a mounting seat 29 is connected between the support rod and the oblique rod, and two mounting holes are provided on the mounting seat, and the support rod and the oblique rod are respectively plugged and connected with the two mounting holes. The front frame and the rear frame are both U-shaped structures, and both include two cross bars, a longitudinal rod connected between the two cross bars, and an L-shaped adapter 30 is connected between the cross bars and the longitudinal rod, and plugs are provided at both ends of the adapter, and the two plugs are respectively plugged and connected with the ends of the cross bars and the longitudinal rod. The connecting rod is hinged between the support rod and the cross bar. The two ends of the adjacent sides of the front frame and the rear frame are respectively hinged together.

The mounting seat is detachably connected to a wheel frame 31, on which a wheel 32 is mounted. A connecting pin 33 is provided on the wheel frame, a connecting hole 34 is provided on the mounting seat, a positioning ring groove 35 is provided on the outer wall of the connecting pin, two relatively movable limit rods 36 are installed in the connecting hole, the connecting pin is adapted to be inserted in the connecting hole, and the positioning ring groove is clamped between the two limit rods. A positioning block 37 is connected to the upper end of the connecting hole, an expanded hole is provided at the upper part of the connecting hole, the lower end of the positioning block is supported at the bottom of the expanded hole, and a buckle cover 41 is connected to the upper end of the positioning block, the buckle cover is placed on the upper edge of the positioning block and the buckle cover is buckled on the side wall of the expanded hole. The positioning block is provided with a lock hole 38, and a sliding hole 39 is provided on the inner wall of the lock hole and at both ends of the limit rod. The two ends of the limit rod are installed in the sliding hole and slide along the sliding hole to adjust the distance between the two limit rods. The lock hole is adapted to connect the cap 40, and a return spring is installed between the cap and the positioning block. The side wall of the cap and the limit block are provided with an inclined push guide groove 42, which is close to the middle from top to bottom, and the end of the limit rod passes through the push guide groove and the sliding hole in turn; the two limit rods are stuck in the positioning ring groove, and a gap is provided between the upper end of the connecting pin and the top of the cap. The outer wall of the upper end of the connecting pin gathers from bottom to top to form a push surface 43. The upper end of the connecting pin is a truncated cone structure with a small upper part and a large lower part.

When the camping cart is in use, an inner liner is installed between the lower bracket and the upper frame for storing items. A drawstring is connected to the pin shaft, and the drawstring is passed through the inner liner. The front diagonal rod, the rear diagonal rod, and the connecting rod play a good supporting role on the upper frame, ensuring the reliable support of the upper frame. When the camping cart is folded, the drawstring is pulled upward to pull the hinge position of the front frame and the rear frame upward, the lower ends of the front diagonal frame and the rear diagonal frame approach each other, the front diagonal frame and the rear diagonal frame rotate and fold around the hinge position of the front diagonal frame and the adapter, and the connecting rod pulls the front frame and the rear frame to rotate and fold downward, and finally the hinge position of the front frame and the rear frame and the adapter arch upward, and the front end of the front frame and the rear end of the rear frame face downward, completing the folding of the entire camping cart. When the camping cart is unfolded for use, the front end of the downwardly facing front frame and the rear end of the rear frame are pulled upward, and the linkage of the connecting rod and the adapter causes the front frame and the rear frame to unfold mutually, the front oblique frame and the rear oblique frame to unfold mutually, and the lower bracket and the upper frame are in a horizontal position to complete the unfolding. The camping cart has a simple structure and is easy to fold and unfold.

Embodiment 2: A camping cart (see Figures 7 and 8), the structure of which is similar to that of Embodiment 1, the main difference being that in this embodiment, a piston 44 is installed on the front frame, an extension rod 45 is connected to the piston, a linkage rod 46 is hinged between the extension rod and the adapter, a piston chamber 47 adapted to the piston is provided on the front frame, a ventilation channel 48 connected to the piston chamber is provided on the front frame, a one-way exhaust valve plate 49 is installed in the ventilation channel, and a preload spring 50 is installed between the one-way exhaust valve plate and the ventilation channel; a push rod 51 for pushing the one-way exhaust valve plate to move is installed on the front frame; when folded, the linkage rod pushes the piston to move, the air pressure in the piston chamber increases to push the one-way exhaust valve plate open, and the air in the piston chamber is discharged from the ventilation channel; when unfolded, the push rod is pushed, the push rod pushes the one-way exhaust valve plate to open, the piston moves in the opposite direction, and the air is drawn into the piston chamber. The end of the extension rod is connected to an extension seat 52, a long slot 53 for avoiding the extension seat is provided on the front frame, and one end of the linkage rod is hinged on the extension seat.

A positioning sleeve 54 is installed at the open end of the air passage on the front frame, an end cap 55 is installed at the inner end of the positioning sleeve, a partition 56 is arranged inside the positioning sleeve, a push rod passes through the end cap and the partition, and the outer end of the push rod extends to the outer end opening position of the positioning sleeve, a positioning protrusion 57 is arranged on the push rod, a positioning spring 58 is installed between the positioning protrusion and the end cap, and the positioning protrusion abuts on the partition. A guide column 59 is arranged on the one-way exhaust valve plate, and an inclined push surface 60 is arranged on the push rod, and the push surface fits the guide column. When the push rod moves, the push surface abuts against the guide column to push the one-way exhaust valve plate to move.

A valve seat 61 is installed in the ventilation channel and in correspondence with the one-way exhaust valve plate. A plurality of valve holes 62 are arranged on the valve seat. A plurality of ventilation slots 63 are arranged on the edge of the one-way exhaust valve plate. The one-way exhaust valve plate seals and covers the valve holes. An extension column 64 is arranged on one side of the one-way exhaust valve plate, and a guide rod 65 is arranged on the other side of the one-way exhaust valve plate. A guide hole adapted to the guide rod is arranged on the valve seat. The guide rod and the guide hole are movably inserted together, and the guide column is arranged on the extension column. The crossbar is a hollow structure, the piston cavity is arranged on a crossbar of the front frame, the front end of the crossbar is sealed and connected to the end plug 66, the ventilation channel is arranged on the end plug, and the positioning sleeve extends to the outer wall of the crossbar. The other structures are the same as those in Example 1.

The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

A camping cart is characterized in that it includes a lower bracket, an upper frame, a front oblique frame and a rear oblique frame connected between the upper frame and the lower bracket, the lower bracket includes a front frame body and a rear frame body hinged together, the upper frame includes a front frame body and a rear frame body, the front part of the front frame body is hinged to the lower part of the front oblique frame, and the rear part of the rear frame body is hinged to the lower part of the rear oblique frame; an adapter is connected between the front frame body and the rear oblique frame, the front frame body is hinged to the adapter, the rear oblique frame is tightly connected to the adapter, the rear frame body is hinged to the front oblique frame, and the upper part of the front oblique frame is hinged to the adapter; connecting rods are hinged between the front oblique frame and the front frame, and between the rear oblique frame and the rear frame.
The camping cart according to claim 1 is characterized in that an avoidance slot is provided on the adapter, and the upper part of the front inclined frame passes through the avoidance slot.
According to a camping cart as described in claim 1, it is characterized in that the adapter includes a horizontal portion and an inclined portion, the horizontal portion and the inclined portion are connected together to form an L-shaped structure with an obtuse angle, the end of the horizontal portion is hinged to the front frame, the inclined portion is inclined downward from front to rear, and the end of the inclined portion is fastened to the rear diagonal frame.
A camping cart according to claim 1, characterized in that two hinged ears are provided at the front of the adapter, the end of the front frame is connected to the hinged head, the hinged head is connected between the two hinged ears, and the hinged head is rotatably connected to the hinged ears.
The camping cart according to claim 1 is characterized in that a socket is provided at the rear of the adapter, and the end of the rear oblique frame is inserted into the socket.
According to the camping cart described in claim 1, it is characterized in that the upper end of the front oblique frame is connected to the front connecting head, the front end of the rear frame is connected to the rear connecting head, the front connecting head is provided with a front connecting seat, the rear connecting head is provided with a rear connecting seat, the front connecting seat and the rear connecting seat are staggered inside and outside, the front connecting seat and the rear connecting seat are attached and hinged together, and the front oblique frame, the front frame, the rear oblique frame, and the rear frame are flush.
A camping cart according to claim 6 is characterized in that arcuate grooves and arcuate positioning strips are provided on the front connecting seat and the rear connecting seat, the arcuate positioning strip on the front connecting seat is installed in the arcuate groove on the rear connecting seat and slides, and the arcuate positioning strip on the rear connecting seat is installed in the arcuate groove on the front connecting seat and slides, and the two arcuate positioning strips abut to realize circumferential positioning of the front connecting seat and the rear connecting seat.
A camping cart according to claim 1, characterized in that the rear end of the front frame is connected to the front support, the front end of the rear frame is connected to the rear support, the front support is provided with two connecting ears, the rear support is provided with a connecting plate protruding forward, the connecting plate is installed between the two connecting ears, a pin is connected between the connecting plate and the connecting ear, the connecting ear is provided with an inclined positioning surface toward the rear support end, guide surfaces are provided on both sides of the connecting plate at the front end of the rear support, and when the front frame and the rear frame are unfolded to a horizontal position, the positioning surfaces abut against the guide surfaces to achieve limiting.
A camping cart according to claim 1, characterized in that a lifting rod is installed at the lower part of the front diagonal frame, the upper end of the lifting rod is connected to the handle, and a torsion spring is installed between the handle and the front diagonal frame to make the upper part of the lifting rod close to the front frame.
A camping cart according to any one of claims 1 to 9, characterized in that the front diagonal frame and the rear diagonal frame are both U-shaped structures, and both the front diagonal frame and the rear diagonal frame include two diagonal rods and a support rod connected between the lower ends of the two diagonal rods, a mounting seat is connected between the support rod and the diagonal rod, and the mounting seat is provided with two mounting holes, and the support rod and the diagonal rod are respectively plug-connected to the two mounting holes.
The camping cart according to claim 10 is characterized in that a wheel frame is detachably connected to the mounting seat, and the wheel frame is mounted on the wheel frame.
According to the camping cart described in claim 11, it is characterized in that a connecting pin is provided on the wheel frame, a connecting hole is provided on the mounting seat, a positioning ring groove is provided on the outer wall of the connecting pin, two limit rods that can be relatively moved are installed in the connecting hole, the connecting pin is adapted to be inserted in the connecting hole, and the positioning ring groove is clamped between the two limit rods.
A camping cart according to claim 12, characterized in that the upper end of the connecting hole is connected to the positioning block, the positioning block is provided with a locking hole, sliding holes are provided on the inner wall of the locking hole and at both ends of the limit rod, the two ends of the limit rod are installed in the sliding holes and slide laterally along the sliding holes to adjust the distance between the two limit rods, the locking hole is adapted to connect the cover cap, a return spring is installed between the cover cap and the positioning block, and inclined push guide grooves are provided on the side walls of the cover cap and at the limit block, the push guide grooves approach the middle from top to bottom, and the ends of the limit rods pass through the push guide grooves and the sliding holes in turn; the two limit rods are stuck in the positioning ring grooves, and a gap is provided between the upper end of the connecting pin and the top of the cover cap.
A camping cart according to claim 13, characterized in that the outer wall of the upper end of the connecting pin gathers from bottom to top to form a pushing surface.
A camping cart according to any one of claims 1 to 9, characterized in that the front frame and the rear frame each include two cross bars and a longitudinal bar connected between the two cross bars, an L-shaped adapter is connected between the cross bars and the longitudinal bar, plugs are provided at both ends of the adapter, and the two plugs are respectively plugged and connected to the ends of the cross bars and the longitudinal bar.
A camping cart according to any one of claims 1 to 9, characterized in that a movable piston is installed on the front frame, an extension rod is connected to the piston, a linkage rod is hinged between the extension rod and the adapter, a piston chamber adapted to the piston is provided on the front frame, a ventilation flow channel connected to the piston chamber is provided on the front frame, a one-way exhaust valve plate is installed in the ventilation flow channel, and a pre-tightening spring is installed between the one-way exhaust valve plate and the ventilation flow channel; a push rod for pushing the one-way exhaust valve plate to move is installed on the front frame; when folded, the linkage rod pushes the piston to move, the air pressure in the piston chamber increases to push the one-way exhaust valve plate open, and the air in the piston chamber is discharged from the ventilation flow channel; when unfolded, the push rod is pushed, the push rod pushes the one-way exhaust valve plate to open, the piston moves in the opposite direction, and the air is drawn into the piston chamber.
A camping cart according to claim 16, characterized in that a positioning sleeve is installed at the open end of the air duct on the front frame, an end cover is installed at the inner end of the positioning sleeve, a partition is provided in the positioning sleeve, a push rod passes through the end cover and the partition and the outer end of the push rod extends to the opening position of the outer end of the positioning sleeve, a positioning protrusion is provided on the push rod, a positioning spring is installed between the positioning protrusion and the end cover, and the positioning protrusion abuts against the partition.
According to the camping cart described in claim 16, it is characterized in that a guide column is provided on the one-way exhaust valve plate, and an inclined pushing surface is provided on the push rod, the pushing surface is in contact with the guide column, and the push rod moves the pushing surface to abut against the guide column to push the one-way exhaust valve plate to move.
A camping cart according to claim 16, characterized in that a valve seat is installed in the ventilation flow channel and corresponding to the one-way exhaust valve plate, a plurality of valve holes are provided on the valve seat, a plurality of ventilation slots are provided on the edge of the one-way exhaust valve plate, and the one-way exhaust valve plate seals and covers the valve holes.
A camping cart according to claim 16, characterized in that the end of the extension rod is connected to the extension seat, a long groove for avoiding the extension seat is provided on the front frame, and one end of the linkage rod is hinged on the extension seat.