CN212074074U - Handle and wheel linked foldable handcart - Google Patents

Abstract

The utility model provides a handle and convenient to use's foldable handcart of wheel linkage, including frame main part, wheel subassembly and handle subassembly, the left and right sides of frame main part all adopts flexible extending structure makes around the frame main part is folding or expand, the wheel subassembly is including installing the front wheel subassembly at frame main part front side position and installing the rear wheel subassembly at frame main part rear side position, the mobilizable setting of handle subassembly is in the frame main part, handle subassembly with the wheel subassembly makes through the linkage of link gear the handle subassembly can drive during the activity the wheel subassembly turns to, and the user can turn to through handle linkage wheel subassembly in the use.

Description

Handle and wheel linked foldable handcart

Technical Field

The utility model relates to a collapsible handcart of handle and wheel linkage.

Background

In daily life, for example, in the processes of buying vegetables, shopping, delivering goods and the like, the trolley collects a convenient short-distance transportation tool.

The existing trolley has the problems of large volume, inconvenience in carrying and storage and the like, and is poor in use experience and inconvenient to use.

Disclosure of Invention

The utility model aims to solve the problem that a collapsible handcart that handle and wheel linkage, facilitate the use is provided.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

handle and wheel linkage's collapsible handcart, including frame main part, wheel subassembly and handle subassembly, the left and right sides of frame main part all adopts flexible extending structure makes around the frame main part can be folded or expand, the wheel subassembly is including installing the front wheel subassembly at frame main part front side position and installing the rear wheel subassembly at frame main part rear side position, the mobilizable establishment of handle subassembly is in the frame main part, the handle subassembly with the wheel subassembly makes through the linkage of link gear the handle subassembly can drive during the activity the wheel subassembly turns to.

The utility model discloses a pass through the link gear linkage with handle subassembly and wheel subassembly for the user can turn to through handle linkage wheel subassembly at any time in the use, and is more laborsaving, and performance is good.

Preferably, the wheel subassembly is including the wheel support who installs the wheel, the wheel support includes the movable wheel support of two sets of intervals settings, movable wheel support all with rotatable the being connected of frame main part is in order to be used for turning to, the link gear includes a connecting piece, the connecting piece with two sets of movable wheel support swing joint make two sets of movable wheel support turn to in step when turning to, handle subassembly with the connecting piece is connected or with wheel leg joint makes handle subassembly can drive when moving movable wheel support moves.

Preferably, the two groups of movable wheel supports are two groups of front wheel supports of a front wheel assembly, or two groups of rear wheel supports of a rear wheel assembly.

Preferably, the movable wheel supports are rotatably connected with the frame main body through wheel support rotating shafts, the connecting pieces are rotatably connected with the two groups of movable wheel supports through first rotating shafts respectively, and the wheel support rotating shafts and the first rotating shafts are arranged in parallel.

Preferably, the wheel support rotating shafts of the two groups of movable wheel supports and the central points of the two first rotating shafts are distributed in a parallelogram shape.

Preferably, the handle assembly is rotatably connected with the frame body through a handle assembly rotating shaft, the connecting piece is rotatably connected with the handle assembly through a second rotating shaft, and the wheel support rotating shaft, the handle assembly rotating shaft, the first rotating shaft and the second rotating shaft are arranged in parallel; or the handle assembly is provided with a stirring piece, one of the stirring piece and the connecting piece is provided with a stirring groove, the other one of the stirring piece and the connecting piece is provided with a stirring shaft extending into the stirring groove, and the connecting piece is stirred to move through the stirring piece when the handle assembly moves.

Preferably, the wheel support rotating shaft, the first rotating shaft and the second rotating shaft handle assembly rotating shaft are vertically arranged rotating shafts or obliquely arranged rotating shafts.

Preferably, the wheel support rotating shaft is fixedly connected with the movable wheel support, a through hole is formed in the frame main body, the wheel support rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on a part, penetrating out of the through hole, of the wheel support rotating shaft to prevent the wheel support rotating shaft from being separated from the through hole, the end cover is connected with the wheel support rotating shaft through a pin or a screw, a shaft hole extending in the radial direction is formed in the wheel support rotating shaft, a hidden hole is formed in at least one end, corresponding to the shaft hole, of the end cover, and the outer end of the pin or the screw is hidden in the hidden hole; or, the wheel support rotating shaft is fixedly connected with the frame main body, the movable wheel support is provided with a through hole, the wheel support rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on a part of the wheel support rotating shaft penetrating out of the through hole to prevent the wheel support rotating shaft from being separated from the through hole, the end cover is connected with the wheel support rotating shaft through a pin shaft or a screw, the wheel support rotating shaft is provided with a shaft hole extending in the radial direction, at least one end of the end cover corresponding to the shaft hole is provided with a hidden hole, and the outer end of the pin shaft or the screw is hidden in the hidden hole; or the handle component rotating shaft is fixedly connected with the handle component, a through hole is formed in the frame main body, the handle component rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on the part, penetrating out of the through hole, of the handle component rotating shaft to prevent the handle component rotating shaft from being separated from the through hole, the end cover is connected with the handle component rotating shaft through a pin or a screw, the handle component rotating shaft is provided with a shaft hole extending in the radial direction, at least one end, corresponding to the shaft hole, of the end cover is provided with a hidden hole, and the outer end of the pin or the screw is hidden in the hidden hole; or the handle component rotating shaft is fixedly connected with the frame main body, a through hole is formed in the handle component, the handle component rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on the part, penetrating out of the through hole, of the handle component rotating shaft to prevent the handle component rotating shaft from being separated from the through hole, the end cover is connected with the handle component rotating shaft through a pin shaft or a screw, the handle component rotating shaft is provided with a shaft hole extending in the radial direction, at least one end, corresponding to the shaft hole, of the end cover is provided with a hidden hole, and the outer end of the pin shaft or the screw is hidden in the hidden hole; or the wheel support rotating shaft is fixedly connected with the movable wheel support, a through hole is formed in the frame main body, the wheel support rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the wheel support rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover is in threaded fit or in snap fit or in splicing fit with the frame main body; or the wheel support rotating shaft is fixedly connected with the frame main body, the movable wheel support is provided with a through hole, the wheel support rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the wheel support rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover and the movable wheel support are in threaded fit or snap fit or plug fit; or the handle component rotating shaft is fixedly connected with the handle component, a through hole is formed in the frame main body, the handle component rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the handle component rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover is in threaded fit or in snap fit or in plug fit with the frame main body; or, handle subassembly axis of rotation with frame main part fixed connection, be equipped with the perforation on the handle subassembly, handle subassembly axis of rotation is followed perforation one end is worn out, the part that handle subassembly axis of rotation was worn out to the perforation outside is equipped with the draw-in groove, be equipped with the snap ring on the draw-in groove in order to prevent wheel support axis of rotation breaks away from the perforation, the part that wheel support axis of rotation was worn out to the perforation outside is equipped with the end cover, the end cover with screw-thread fit or buckle fit or grafting cooperation between the handle subassembly.

Preferably, a plastic sleeve is arranged in the through hole, and a channel extending along the axial direction is arranged on the inner side of the plastic sleeve to facilitate rotation.

Preferably, the plastic shaft sleeve comprises two short shaft sleeves, and the two short shaft sleeves are sleeved in the through hole from two ends of the through hole respectively.

Preferably, the movable wheel bracket is provided with a detachable or non-detachable vehicle tile; or the wheel support comprises a fixed wheel support fixed on the frame main body, and a detachable or non-detachable vehicle tile is arranged on the fixed wheel support.

Preferably, the wheel support is provided with a brake device.

Preferably, the brake device comprises a treading part hinged to the wheel support, the treading part is provided with a brake clamping part, the wheel on the wheel support is provided with a brake clamping groove for clamping or withdrawing the brake clamping part, the treading part swings in one direction to enable the brake clamping part to enter the brake clamping groove, and swings in the opposite direction to enable the brake clamping part to withdraw from the brake clamping groove; or, brake equipment steps on the portion including the foot that articulates on the wheel support, the foot is stepped on and is equipped with the brake draw-in groove in the portion, be equipped with the card on the wheel support and go into or withdraw from the brake card portion of brake draw-in groove, the foot is stepped on the portion and is made brake card portion get into the brake draw-in groove, make the brake card withdraw from the brake draw-in groove to a direction swing.

Preferably, the side part of the wheel is integrally or separately provided with a mounting disc, the brake clamping grooves are circumferentially distributed on the mounting disc, and the center of the circumference is consistent with the center of the wheel shaft of the wheel.

Preferably, the frame body further comprises a standing structure such that the foldable wagon can stand after being folded.

Preferably, the frame body comprises a first part and a second part, the first part and the second part move relatively during the folding process of the frame body, the standing structure comprises a support leg and a connecting rod movably connected with the support leg, the support leg and the connecting rod are respectively hinged on the first part and the second part, and when the frame body is folded, the first part and the second part move relatively and drive the support leg to prop up the frame body through the connecting rod so as to enable the foldable handcart to stand; when the frame main body is unfolded, the first part and the second part move relatively and drive the supporting legs to be put down through the connecting rods.

Preferably, the frame body comprises two hinged parts hinged to each other, and the support leg and the connecting rod are respectively hinged to the two hinged parts.

Preferably, the legs are herringbone legs.

Preferably, the standing structure comprises two sets of feet.

Preferably, the frame body includes a front frame, a rear frame, a left frame, a right frame, and a bottom frame, the left frame and/or the right frame having a side hinge mechanism by which the frame body side portion can be folded or unfolded back and forth, the bottom frame having a bottom hinge mechanism by which the frame body bottom portion can be folded or unfolded back and forth.

Preferably, the side hinge mechanism comprises a first hinge rod, a second hinge rod, a third hinge rod and a fourth hinge rod, the middle parts of the first hinge rod and the second hinge rod are hinged to form an X-shaped structure, the middle parts of the third hinge rod and the fourth hinge rod are hinged to form an X-shaped structure, the bottom end of the first hinge rod is hinged to the bottom end of the third hinge rod, and the top end of the second hinge rod is hinged to the top end of the fourth hinge rod; the top end of the first hinge rod is hinged with the front side frame, or the top end of the first hinge rod is connected with the front side frame through an intermediate piece, and the intermediate piece is hinged with the first hinge rod and the front side frame respectively; the bottom end of the second hinge rod is hinged with the front side frame, or the bottom end of the second hinge rod is connected with the front side frame through an intermediate piece, and the intermediate piece is respectively hinged with the second hinge rod and the front side frame; the top end of the third hinge rod is hinged with the rear side frame, or the top end of the third hinge rod is connected with the rear side frame through an intermediate piece, and the intermediate piece is respectively hinged with the third hinge rod and the rear side frame; the bottom end of the fourth hinged rod is hinged with the rear side frame, or the bottom end of the fourth hinged rod is connected with the rear side frame through an intermediate piece, and the intermediate piece is hinged with the fourth hinged rod and the rear side frame respectively.

Preferably, the top end of the first hinge rod is connected to the front side frame through an intermediate member, the intermediate member is hinged to the first hinge rod and the front side frame, the bottom end of the second hinge rod is hinged to the front side frame, the top end of the third hinge rod is connected to the rear side frame through an intermediate member, the intermediate member is hinged to the third hinge rod and the rear side frame, the hinge point of the intermediate member and the third hinge rod is lower than the hinge point of the intermediate member and the rear side frame, the bottom end of the fourth hinge rod is hinged to the rear side frame, and in the unfolded state, the hinge point of the intermediate member and the first hinge rod is lower than the hinge point of the intermediate member and the front side frame.

Preferably, the bottom hinge mechanism comprises two support frames with inner ends hinged to each other, wherein the outer end of one support frame is hinged to one of the front side frame, the left side frame and the right side frame, and the outer end of the other support frame is hinged to the other one of the front side frame, the left side frame and the right side frame.

Preferably, the two support frames are folded upwards in the folding process of the frame main body, and in the unfolding state, a hinge point at the inner ends of the support frames is lower than a hinge point at the outer ends of the support frames.

Preferably, a support member is connected between the left side frame and the right side frame for supporting the unfolded bottom frame.

Preferably, the supporting member and the two first hinge rods of the left and right frames form an integral structure, or the supporting member and the two third hinge rods of the left and right frames form an integral structure, or the supporting member and the first hinge rods of the left and right frames form an integral structure, or the supporting member and the third hinge rods of the left and right frames form an integral structure.

Preferably, the intermediate member at the front side frame or the rear side frame extends outward to form a basket frame foldable with the frame main body.

Preferably, the second hinge rod of the left side frame is fixedly connected with the second hinge rod of the right side frame through a connecting part, and the front wheel assembly is arranged on the connecting part; and/or the fourth hinged rod of the right side frame is fixedly connected with the fourth hinged rod of the right side frame through a connecting part, and the rear wheel assembly is arranged on the connecting part.

Preferably, the front wheel assembly is provided on the front side frame; and/or the rear wheel assembly is provided on the rear side frame.

Preferably, be equipped with the storing bag in the frame main part, the storing bag has bottom surface, leading flank, trailing flank, left surface and right flank, the bottom surface with bottom frame connects, the inside bottom surface of storing bag is equipped with the portion of drawing, draws upward the portion of drawing drives bottom frame is folding upwards and then drives the frame main part is folding.

Preferably, the foldable trolley further comprises a ceiling, retractable or reversible ceiling supporting rods are arranged at four corners of the trolley frame main body, and the ceiling is installed on the ceiling supporting rods.

Preferably, the top end of the ceiling supporting rod is provided with a thickened anti-drop piece to prevent the ceiling from dropping off.

Preferably, the ceiling stay is a retractable ceiling stay, and a tip of the ceiling stay is inclined outward to tighten the ceiling.

Preferably, the ceiling support rod is a ceiling support rod which can stretch out and draw back relative to the frame main body, and an anti-slip piece is arranged between the ceiling support rod and the frame main body to prevent the ceiling support rod from slipping and retracting between the extended ceiling support rod and the frame main body.

Preferably, the frame body includes a removable basket frame.

Preferably, the frame main body is provided with a locking structure so that the frame main body is locked after being folded.

Preferably, the frame main part includes first portion and second part, the frame main part folding in-process first portion and second part relative motion, the hasp structure is including establishing the locking plate of taking the latch groove on the first portion and establishing the latch portion on the second part, the locking plate is equipped with the guide face that guide latch portion got into the latch inslot towards the one end of latch portion, the locking plate of locking plate for having elasticity resettable, perhaps, latch portion is telescopic latch portion, the frame main part folding in-process, first portion and second part relative motion, locking plate, latch portion relative motion, latch portion is gone into through the guide face card make in the latch groove the locking after the frame main part is folded.

Preferably, left side frame or right side frame include first portion and second portion, the locking plate is for setting firmly the plastic sheet on the first portion, the plastic sheet is for receiving the external force effect can the horizontal hunting, remove the elastic plastic sheet that relies on self elasticity to reset after the external force, the card lock groove runs through both ends about the elastic plastic sheet, the locking plate forms the guide face that the guide latch portion got into the card lock inslot towards the one end of card lock portion is outside crooked.

Preferably, the handle assembly comprises a rotating seat rotatably mounted on the frame body and a handle hinged to the rotating seat and capable of swinging back and forth, an energy storage device is arranged between the handle and the rotating seat, and the energy storage device has an acting force on the handle to enable the handle to swing towards the direction of the frame body.

Preferably, the frame body is provided with a fixing part for fixing the handle.

Preferably, the fixing part is a clamping piece with a clamping groove arranged on the frame main body.

Preferably, the handle is a handle with adjustable length.

Preferably, the handle is a telescopic or foldable handle.

Preferably, the handle comprises a lower handle part and an upper handle part connected with the lower handle part in a sliding manner, one of the lower handle part and the upper handle part is provided with a clamping groove, and the other handle part is provided with a clamping part capable of being inserted into or withdrawn from the clamping groove.

Preferably, the upper handle part is sleeved in the lower handle part, the lower handle part is provided with a pull buckle, the clamping part is arranged on the pull buckle and is pulled, the clamping part can be inserted into or withdrawn from the clamping groove, an energy storage device is arranged between the lower handle part and the pull buckle, and the energy storage device has an acting force on the pull buckle to enable the clamping part to move towards the inside of the clamping groove.

Advantageous effects

The utility model adopts the above technical scheme afterwards, through passing through the link gear linkage with handle subassembly and wheel subassembly for the user can turn to through handle linkage wheel subassembly at any time in the use, and is more laborsaving, and performance is good.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an embodiment of the linkage mechanism of the present invention;

FIG. 3 is a schematic view of a partial structure of the present invention;

FIG. 4 is an end view of the bushing;

FIG. 5 is a schematic view of a brake device;

FIG. 6 is a schematic view of a stand apparatus;

FIG. 7 is a schematic view of a locking device;

FIG. 8 is a schematic view of one construction of the pull handle assembly;

fig. 9 is a schematic structural view of a length adjustment part of the handle assembly.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings, so that how to implement the technical means of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.

Certain terms are used herein to refer to particular components, and those skilled in the art will understand that the description and claims do not distinguish between components by difference in name, but rather by difference in function. It should be noted that, when an element is described as being "provided with" or "disposed on" another element, it may mean that the element is directly provided or disposed on the other element or intervening elements may be present, and may be a unitary structure or a split structure, unless otherwise specified. When an element is described as being "connected" to another element, it can be directly connected or connected through intervening elements, or it can be integrally connected or separately connected. When an element is referred to as being "on" another element, it does not mean that the element is necessarily on top of or above the other element, or in other locations. The terms "upper", "lower", "left", "right", "high", "low" and the like are used herein with reference to the normal state of the product in which it is placed, and are used for convenience of description only. The term "plurality" as used herein refers to two or more numbers. The terms "vertical," "horizontal," and the like as used herein refer to a substantially vertical or substantially horizontal condition within reasonable tolerances and are not necessarily exact.

Referring to fig. 1, the utility model discloses handle and wheel linkage's collapsible handcart mainly includes frame main part, wheel subassembly, handle subassembly, storing bag (not shown in the figure), ceiling (not shown in the figure) are constituteed, the left and right sides of frame main part all adopts flexible extending structure makes around the frame main part can be folded or expand, the wheel subassembly is including installing the front wheel subassembly at frame main part front side position and installing the rear wheel subassembly at frame main part rear side position, handle subassembly is mobilizable to be established in the frame main part, handle subassembly with the wheel subassembly makes through the linkage mechanism linkage the handle subassembly can drive when moving the wheel subassembly turns to.

The frame body comprises a front side frame 1, a rear side frame 2, a left side frame, a right side frame and a bottom frame, wherein the left side frame and/or the right side frame is/are provided with a side hinge mechanism, the side hinge mechanism enables the side part of the frame body to be folded or unfolded front and back, and the bottom frame is provided with a bottom hinge mechanism, and the bottom of the frame body can be folded or unfolded front and back through the bottom hinge mechanism. Correspondingly, the storage bag is provided with a bottom surface, a front side surface, a rear side surface, a left side surface and a right side surface, wherein the bottom surface is connected with the bottom frame, the front side surface is connected with the front side frame, the rear side surface is connected with the rear side frame, the left side surface is connected with the left side frame, and the right side surface is connected with the right side frame in any detachable or non-detachable way such as rope systems, wire systems, magic tapes, sticking, sleeving, wrapping and the like; during the folding process of the frame main body, the storage bag is folded, and during the unfolding process of the frame main body, the storage bag is unfolded.

Referring to fig. 1, in the present embodiment, the left side frame and the right side frame have the same structure. The side hinge mechanism comprises a first hinge rod 3, a second hinge rod 4, a third hinge rod 5 and a fourth hinge rod 6, the middle parts of the first hinge rod and the second hinge rod and the middle parts of the third hinge rod and the fourth hinge rod are hinged through hinge shafts to form an X-shaped structure, the bottom end of the first hinge rod is hinged to the bottom end of the third hinge rod through a hinge shaft, and the top end of the second hinge rod is hinged to the top end of the fourth hinge rod through a hinge shaft; the top end of the first hinge rod is connected with the front side frame through an intermediate piece 7, and the intermediate piece is respectively hinged with the first hinge rod and the front side frame through hinge shafts; the bottom end of the second hinge rod is hinged to the front side frame, the top end of the third hinge rod is connected with the rear side frame through an intermediate piece, the intermediate piece is hinged to the third hinge rod and the rear side frame respectively, and the bottom end of the fourth hinge rod is directly hinged to the rear side frame through a hinge shaft.

In other embodiments, the first hinge rod top end may be directly hinged to the front side frame; the bottom end of the second hinge rod can also be connected with the front side frame through an intermediate piece, and the intermediate piece is respectively hinged with the second hinge rod and the front side frame; the top end of the third hinge rod is hinged with the rear side frame; or the bottom end of the fourth hinged rod is connected with the rear side frame through an intermediate piece, and the intermediate piece is hinged with the fourth hinged rod and the rear side frame respectively.

In this embodiment, a hinge point between the middle piece and the third hinge rod is lower than a hinge point between the middle piece and the third hinge rod and the hinge.

Referring to fig. 1, the bottom hinge mechanism includes two support frames 8 whose inner ends are hinged to each other, wherein an outer end of one support frame is hinged to one of the front side frame, the left side frame and the right side frame, an outer end of the other support frame is hinged to the other one of the front side frame, the left side frame and the right side frame, the two support frames are folded upwards in the folding process of the frame body, and in the unfolding state, a hinge point at the inner ends of the support frames is lower than a hinge point at the outer ends of the support frames. The bottom surface in the storage bag is provided with a pulling part for pulling upwards, and a user pulls upwards the pulling part to drive the bottom frame to be folded upwards so as to drive the frame body to be folded.

Referring to fig. 1, a support member 9 is connected between the left and right side frames to support the unfolded bottom frame.

In other embodiments, the supporting member and the two first hinge rods of the left and right frames may be of an integral structure, or the supporting member and the two third hinge rods of the left and right frames may be of an integral structure, or the supporting member and the first hinge rods of the left and right frames may be of an integral structure, or the supporting member and the third hinge rods of the left and right frames may be of an integral structure.

Referring to fig. 1, the left and right intermediate members at the rear side frame extend outward and are connected to form a basket frame 10 foldable with the frame body, to which a basket for holding articles can be mounted. In other embodiments, it may be provided at the front side frame; in other embodiments, the basket frame may be detachably mounted to the frame body.

Referring to fig. 1, the second hinge rod of the left side frame is fixedly connected with the second hinge rod of the right side frame through a connecting part 11, and the front wheel assembly is arranged on the connecting part; the fourth hinge rod of the right side frame is fixedly connected with the fourth hinge rod page of the right side frame through a connecting part, and the rear wheel assembly is arranged on the connecting part.

In other embodiments, the front wheel assembly may be provided directly on the front side frame; the rear wheel assembly may be provided directly on the rear side frame.

Referring to fig. 1, four corners of the frame body are provided with retractable ceiling support rods 12, the ceiling is mounted on the ceiling support rods, the top ends of the ceiling support rods are provided with thickened anti-falling pieces, and the ceiling is clamped by the anti-falling pieces so as to be prevented from being separated. Wherein, ceiling branch is the flexible ceiling branch of frame main part relatively, is equipped with two sleeve pipes that lean out the setting from bottom to top on front frame, rear frame, ceiling branch cover is established in the sleeve pipe, the top of ceiling branch inclines to the outside in order to incite somebody to action the ceiling tensioning, ceiling branch with be equipped with anti-disengaging piece between the frame main part in order to prevent ceiling branch stretch out the back with break away from between the frame main part, ceiling branch with be equipped with anti-skidding piece between the frame main part in order to prevent ceiling branch stretch out the back with the withdrawal of skidding between the frame main part.

In another embodiment, the frame body may further include reversible ceiling stays at four corners thereof, and the ceiling may be attached to the ceiling stays.

Preferably, the wheel assembly comprises a wheel support provided with wheels, the wheel support comprises two groups of movable wheel supports 13 arranged at intervals and two groups of fixed wheel supports 14 arranged at intervals, wherein the two groups of movable wheel supports are two groups of front wheel supports of the front wheel assembly, and the two groups of fixed wheel supports are two groups of rear wheel supports of the rear wheel assembly. In other embodiments, the two sets of movable wheel supports may also be two sets of rear wheel supports of the rear wheel assembly, and the two sets of fixed wheel supports may be two sets of front wheel supports of the front wheel assembly. The movable wheel supports and the fixed wheel supports are configured to be arranged in a staggered mode, so that the front wheel component and the rear wheel component do not interfere with each other after the frame body is folded, and preferably, the movable wheel supports and the fixed wheel supports are configured to be located between the two groups of movable wheel supports after the frame body is folded.

Referring to fig. 2, the movable wheel brackets are rotatably connected to the connecting portion 11 of the frame body for steering, the linkage mechanism includes a connecting member 15, the connecting member is movably connected to the two movable wheel brackets so that the two movable wheel brackets steer synchronously when steering, and the handle assembly is connected to the connecting member or connected to the wheel brackets so that the handle assembly can drive the movable wheel brackets to move when moving.

Referring to fig. 2 and 3, the movable wheel supports are rotatably connected with the frame body through wheel support rotating shafts 16, the connecting pieces are rotatably connected with the two groups of movable wheel supports through first rotating shafts respectively, the wheel support rotating shafts and the first rotating shafts are arranged in parallel, and the wheel support rotating shafts of the two groups of movable wheel supports and the central points of the two first rotating shafts are distributed in a parallelogram shape.

The handle assembly is rotationally connected with the frame main body through a handle assembly rotating shaft 17, the connecting piece is rotationally connected with the handle assembly through a second rotating shaft, and the wheel support rotating shaft, the handle assembly rotating shaft, the first rotating shaft and the second rotating shaft are arranged in parallel.

In other embodiments, a toggle piece may be disposed on the handle assembly, one of the toggle piece and the connecting piece has a toggle groove, and the other has a toggle shaft extending into the toggle groove, and the handle assembly toggles the connecting piece to move when moving.

Preferably, the wheel support rotating shaft, the first rotating shaft and the second rotating shaft handle assembly rotating shaft are obliquely arranged rotating shafts. In other embodiments, the wheel support pivot, the first pivot, and the second pivot handle assembly pivot are vertically disposed pivots.

Referring to fig. 3, the wheel support rotating shaft is fixedly connected with the movable wheel support, preferably welded together or integrated into a whole, a through hole is formed in the frame body, the wheel support rotating shaft penetrates out of one end of the through hole, an end cover 18 is sleeved on a part of the wheel support rotating shaft penetrating out of the through hole to prevent the wheel support rotating shaft from being separated from the through hole, the end cover is connected with the wheel support rotating shaft through a pin 19 or a screw, a shaft hole extending in the radial direction is formed in the wheel support rotating shaft, a hidden hole 20 is formed in at least one end, corresponding to the shaft hole, of the end cover, and the outer end of the pin or the screw is hidden in the hidden hole.

In other embodiments, the wheel support rotating shaft is fixedly connected with the frame main body, the movable wheel support is provided with a through hole, the wheel support rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on a part of the wheel support rotating shaft, which penetrates out of the through hole, so as to prevent the wheel support rotating shaft from being separated from the through hole, the end cover is connected with the wheel support rotating shaft through a pin or a screw, the wheel support rotating shaft is provided with a shaft hole extending in the radial direction, at least one end of the end cover, which corresponds to the shaft hole, is provided with a hidden hole, and the outer end of the pin or the screw is hidden in the hidden hole; or the wheel support rotating shaft is fixedly connected with the movable wheel support, a through hole is formed in the frame main body, the wheel support rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the wheel support rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover is in threaded fit or in snap fit or in splicing fit with the frame main body; or, wheel support axis of rotation with frame main part fixed connection, be equipped with the perforation on the mobile wheel support, wheel support axis of rotation is followed perforation one end is worn out, the part that wheel support axis of rotation was worn out to the perforation outside is equipped with the draw-in groove, be equipped with the snap ring on the draw-in groove in order to prevent wheel support axis of rotation breaks away from the perforation, the part that wheel support axis of rotation was worn out to the perforation outside is equipped with the end cover, the end cover with screw-thread fit or buckle cooperation or grafting cooperation between the mobile wheel support.

Referring to fig. 3, the handle assembly rotating shaft is fixedly connected with the handle assembly, a through hole is formed in the frame body, the handle assembly rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on a part, penetrating out of the through hole, of the handle assembly rotating shaft to prevent the handle assembly rotating shaft from being separated from the through hole, the end cover is connected with the handle assembly rotating shaft through a pin or a screw, a shaft hole extending in the radial direction is formed in the handle assembly rotating shaft, a hidden hole is formed in at least one end, corresponding to the shaft hole, of the end cover, and the outer end of the pin or the screw is hidden in the hidden hole.

In other embodiments, the handle assembly rotating shaft is fixedly connected with the frame main body, a through hole is formed in the handle assembly, the handle assembly rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on a part of the handle assembly rotating shaft, which penetrates out of the through hole, so as to prevent the handle assembly rotating shaft from being separated from the through hole, the end cover is connected with the handle assembly rotating shaft through a pin or a screw, the handle assembly rotating shaft is provided with a shaft hole extending in the radial direction, at least one end of the end cover, which corresponds to the shaft hole, is provided with a hidden hole, and the outer end of the pin or the screw is hidden in the hidden hole; or the handle component rotating shaft is fixedly connected with the handle component, a through hole is formed in the frame main body, the handle component rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the handle component rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover is in threaded fit or in snap fit or in plug fit with the frame main body; or, handle subassembly axis of rotation with frame main part fixed connection, be equipped with the perforation on the handle subassembly, handle subassembly axis of rotation is followed perforation one end is worn out, the part that handle subassembly axis of rotation was worn out to the perforation outside is equipped with the draw-in groove, be equipped with the snap ring on the draw-in groove in order to prevent wheel support axis of rotation breaks away from the perforation, the part that wheel support axis of rotation was worn out to the perforation outside is equipped with the end cover, the end cover with screw-thread fit or buckle fit or grafting cooperation between the handle subassembly.

Referring to fig. 3 and 4, a plastic sleeve 21 is provided in the bore, with axially extending channels 211 on the inside to facilitate rotation. Preferably, the plastic shaft sleeve comprises two short shaft sleeves, and the two short shaft sleeves are sleeved in the through hole from two ends of the through hole respectively.

Referring to fig. 1, the movable wheel support is provided with a detachable vehicle tile 22; in other embodiments, the movable wheel support is provided with a non-detachable tile 22; in other embodiments, the wheel support comprises a fixed wheel support fixed on the frame main body, and the fixed wheel support is provided with a removable or non-removable tile.

In this embodiment, a brake device is arranged on the wheel support.

Referring to fig. 1 and 5, the brake device includes a treading portion 23 hinged to the wheel support, the treading portion is provided with a brake clamping portion 24, a wheel on the wheel support is provided with a brake clamping groove 25 for clamping or withdrawing the brake clamping portion, the treading portion swings in one direction to enable the brake clamping portion to enter the brake clamping groove, and swings in the opposite direction to enable the brake clamping to withdraw from the brake clamping groove; in other embodiments, brake equipment steps on portion including the foot that articulates on the wheel support, the foot is stepped on and is equipped with the brake draw-in groove in the portion, be equipped with on the wheel support and block into or withdraw from the brake card portion of brake draw-in groove, the foot is stepped on the portion and is made brake card portion get into the brake draw-in groove, make the brake card withdraw from the brake draw-in groove to a direction swing to one direction opposite.

Referring to fig. 5, the wheel side is integrally or separately provided with a mounting plate 26, the brake clamping grooves are circumferentially distributed on the mounting plate, and the center of the circumference is consistent with the center of the wheel axle of the wheel.

In this embodiment, the frame body further includes a standing structure to allow the foldable stroller to stand after being folded.

Specifically, the frame body comprises a first part and a second part, the first part and the second part move relatively in the folding process of the frame body, the standing structure comprises a support leg 27 and a connecting rod 28 movably connected with the support leg, the support leg and the connecting rod are respectively hinged on the first part and the second part, and when the frame body is folded, the first part and the second part move relatively and drive the support leg to support the frame body through the connecting rod so as to enable the foldable handcart to stand; when the frame main body is unfolded, the first part and the second part move relatively and drive the supporting legs to be put down through the connecting rods.

Referring to fig. 6, the frame body includes two hinge members, a fixed wheel bracket and a fourth hinge member, the two hinge members are hinged to each other, the fixed wheel bracket is fixed to the rear side frame, the support leg is hinged to the fixed wheel bracket of the rear side frame, and the connecting rod is hinged to the fourth hinge member.

In this embodiment, the support legs are chevron-shaped support legs with two supporting points, and the standing structure includes two groups of support legs respectively disposed at inner sides of the two groups of front wheel assemblies.

In other embodiments, the folded frame body has front and rear wheel assemblies that are offset from one another such that the foldable wagon can stand when folded.

In other embodiments, the frame body is provided with a rotatable bracket, and after the foldable stroller is folded, the bracket is rotated to a supporting position to enable the foldable stroller to stand, and the bracket structure can refer to a bicycle bracket, which is not described herein.

In this embodiment, the vehicle frame main body is provided with a lock catch structure so that the vehicle frame main body is locked after being folded.

Referring to fig. 7, the left side frame or the right side frame of the frame body comprises a first part and a second part, the locking structure comprises a locking piece 30 provided on the first part and having a locking groove 29, and a locking part 31 provided on the second part, one end of the locking piece facing the locking part is provided with a guide surface 32 guiding the locking part into the locking groove, and the locking piece is a locking piece with elasticity and resettability; in other embodiments, the locking portion is a telescopic locking portion, in the folding process of the frame body, the first portion and the second portion move relatively, the locking plate and the locking portion move relatively, and the locking portion is clamped into the locking groove through the guide surface to enable the frame body to be locked after being folded.

In this embodiment, the locking plate is for setting firmly the plastic sheet on the first portion, but the plastic sheet is for receiving external force effect horizontal hunting, removing the elastic plastic sheet that relies on self elasticity to reset after external force, the card lock groove runs through both ends about the elastic plastic sheet, the locking plate outwards bends towards the one end of card lock portion and forms the guide face that the guide card lock portion got into the card lock inslot.

In this embodiment, the locking plate 30 is disposed at the hinge position of the first hinge rod and the second hinge rod 4, and the latch is disposed at the hinge position of the third hinge rod 5 and the fourth hinge rod 6; in other embodiments, the locking plate 30 is disposed at the hinge point of the third hinge rod 5 and the fourth hinge rod 6, and the latch is disposed at the hinge point of the first hinge rod and the second hinge rod 4; in other embodiments, the locking tab 30 is disposed at another location on one of the first hinge rod, the second hinge rod 4, the third hinge rod 5, or the fourth hinge rod 6, and the locking portion is disposed at another location on the other.

Referring to fig. 8, the handle assembly includes a rotating seat 33 rotatably mounted on the frame body and a handle 34 hinged on the rotating seat and capable of swinging back and forth, an energy storage device 41 is arranged between the handle and the rotating seat, and the energy storage device has an acting force on the handle to make the handle swing towards the direction of the frame body.

Specifically, the rotating seat 33 and the handle 34 are hinged through a shaft 42, the energy storage device 41 is a torsion spring arranged on the shaft 42, and two torsion legs of the torsion spring are respectively connected with the rotating seat 33 and the handle 34.

In this embodiment, the frame body is provided with a fixing portion for fixing the handle, and referring to fig. 1, the fixing portion is a clamping piece 35 with a clamping groove, which is arranged on the frame body.

In this embodiment, the handle is a handle with adjustable length, and preferably, the handle is a retractable or foldable handle.

Referring to fig. 8 and 9, the handle includes a lower handle portion 36 and an upper handle portion 37 slidably connected to the lower handle portion, one of the lower handle portion and the upper handle portion is provided with a locking groove 38, and the other is provided with a locking portion 39 that can be inserted into or withdrawn from the locking groove. Preferably, the upper handle part is sleeved in the lower handle part, the lower handle part is provided with a pull buckle 40, the clamping part is arranged on the pull buckle, the clamping groove is arranged on the upper handle part, the pull buckle is pulled, the clamping part can be inserted into or withdrawn from the clamping groove, an energy storage device is arranged between the lower handle part and the pull buckle, and the energy storage device has an acting force for enabling the clamping part to move into the clamping groove for the pull buckle.

In fig. 9, a trigger 40 is pivotally connected to the lower pull-down grip 36 via a pivot, the energy storage device therebetween is a torsion spring disposed therebetween, and a locking portion 39 is disposed on one side of the trigger.

The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.

Claims (45)

1. Handle and wheel linkage's collapsible handcart, including frame main part, wheel subassembly and handle subassembly, the left and right sides of frame main part all adopts flexible extending structure in front and back to make the frame main part is folding or expansion in front and back, its characterized in that, the wheel subassembly is including installing the front wheel subassembly at frame main part front side position and installing the rear wheel subassembly at frame main part rear side position, the mobilizable establishment of handle subassembly is in the frame main part, the handle subassembly with the wheel subassembly makes through the linkage of link gear the handle subassembly can drive during the activity the wheel subassembly turns to.

2. The handle and wheel linked foldable trolley according to claim 1, wherein the wheel assembly comprises a wheel support frame on which wheels are mounted, the wheel support frame comprises two sets of movable wheel supports arranged at intervals, the movable wheel supports are both rotatably connected with the frame body for steering, the linkage mechanism comprises a connecting piece, the connecting piece is movably connected with the two sets of movable wheel supports to enable the two sets of movable wheel supports to steer synchronously when steering, and the handle assembly is connected with the connecting piece or connected with the wheel support frame to enable the handle assembly to drive the movable wheel supports to move when moving.

3. The handle and wheel linked foldable wagon of claim 2, wherein the two sets of movable wheel brackets are two sets of front wheel brackets of a front wheel assembly or two sets of rear wheel brackets of the rear wheel assembly.

4. The handle and wheel linked foldable trolley according to claim 2, wherein the movable wheel brackets are rotatably connected to the frame body by wheel bracket rotating shafts, the connecting member is rotatably connected to each of the two sets of movable wheel brackets by a first rotating shaft, and the wheel bracket rotating shafts are arranged in parallel with the first rotating shaft.

5. The handle and wheel linked foldable trolley according to claim 4, wherein the wheel support rotation axes of the two sets of movable wheel supports and the center points of the two first rotation axes are distributed in a parallelogram shape.

6. The handle and wheel linked foldable hand truck of claim 4, wherein the handle assembly is rotatably connected to the frame body by a handle assembly rotation axis, the connector is rotatably connected to the handle assembly by a second rotation axis, and the wheel support rotation axis, the handle assembly rotation axis, the first rotation axis and the second rotation axis are arranged in parallel; or the handle assembly is provided with a stirring piece, one of the stirring piece and the connecting piece is provided with a stirring groove, the other one of the stirring piece and the connecting piece is provided with a stirring shaft extending into the stirring groove, and the connecting piece is stirred to move through the stirring piece when the handle assembly moves.

7. A handle and wheel linked foldable wagon as claimed in claim 6, wherein the wheel support rotation axis, the first rotation axis, and the second rotation axis handle assembly rotation axis are vertically disposed rotation axes or obliquely disposed rotation axes.

8. The handle and wheel linked foldable trolley according to claim 6, wherein the wheel support rotation shaft is fixedly connected to the movable wheel support, the frame body is provided with a through hole, the wheel support rotation shaft penetrates out of one end of the through hole, an end cover is sleeved on a portion of the wheel support rotation shaft penetrating out of the through hole to prevent the wheel support rotation shaft from being separated from the through hole, the end cover is connected with the wheel support rotation shaft through a pin or a screw, the wheel support rotation shaft is provided with a shaft hole extending in a radial direction, at least one end of the end cover corresponding to the shaft hole is provided with a hidden hole, and the outer end of the pin or the screw is hidden in the hidden hole; or, the wheel support rotating shaft is fixedly connected with the frame main body, the movable wheel support is provided with a through hole, the wheel support rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on a part of the wheel support rotating shaft penetrating out of the through hole to prevent the wheel support rotating shaft from being separated from the through hole, the end cover is connected with the wheel support rotating shaft through a pin shaft or a screw, the wheel support rotating shaft is provided with a shaft hole extending in the radial direction, at least one end of the end cover corresponding to the shaft hole is provided with a hidden hole, and the outer end of the pin shaft or the screw is hidden in the hidden hole; or the handle component rotating shaft is fixedly connected with the handle component, a through hole is formed in the frame main body, the handle component rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on the part, penetrating out of the through hole, of the handle component rotating shaft to prevent the handle component rotating shaft from being separated from the through hole, the end cover is connected with the handle component rotating shaft through a pin or a screw, the handle component rotating shaft is provided with a shaft hole extending in the radial direction, at least one end, corresponding to the shaft hole, of the end cover is provided with a hidden hole, and the outer end of the pin or the screw is hidden in the hidden hole; or the handle component rotating shaft is fixedly connected with the frame main body, a through hole is formed in the handle component, the handle component rotating shaft penetrates out of one end of the through hole, an end cover is sleeved on the part, penetrating out of the through hole, of the handle component rotating shaft to prevent the handle component rotating shaft from being separated from the through hole, the end cover is connected with the handle component rotating shaft through a pin shaft or a screw, the handle component rotating shaft is provided with a shaft hole extending in the radial direction, at least one end, corresponding to the shaft hole, of the end cover is provided with a hidden hole, and the outer end of the pin shaft or the screw is hidden in the hidden hole; or the wheel support rotating shaft is fixedly connected with the movable wheel support, a through hole is formed in the frame main body, the wheel support rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the wheel support rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover is in threaded fit or in snap fit or in splicing fit with the frame main body; or the wheel support rotating shaft is fixedly connected with the frame main body, the movable wheel support is provided with a through hole, the wheel support rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the wheel support rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover and the movable wheel support are in threaded fit or snap fit or plug fit; or the handle component rotating shaft is fixedly connected with the handle component, a through hole is formed in the frame main body, the handle component rotating shaft penetrates out of one end of the through hole, a clamping groove is formed in the part, penetrating out of the through hole, of the handle component rotating shaft, a clamping ring is arranged on the clamping groove to prevent the wheel support rotating shaft from being separated from the through hole, an end cover is arranged on the part, penetrating out of the through hole, of the wheel support rotating shaft, and the end cover is in threaded fit or in snap fit or in plug fit with the frame main body; or, handle subassembly axis of rotation with frame main part fixed connection, be equipped with the perforation on the handle subassembly, handle subassembly axis of rotation is followed perforation one end is worn out, the part that handle subassembly axis of rotation was worn out to the perforation outside is equipped with the draw-in groove, be equipped with the snap ring on the draw-in groove in order to prevent wheel support axis of rotation breaks away from the perforation, the part that wheel support axis of rotation was worn out to the perforation outside is equipped with the end cover, the end cover with screw-thread fit or buckle fit or grafting cooperation between the handle subassembly.

9. The handle and wheel linked foldable wagon of claim 8, wherein the aperture is provided with a plastic bushing having an axially extending channel therein to facilitate rotation.

10. The handle and wheel linked foldable trolley according to claim 9, wherein said plastic sleeves comprise two short sleeves, said two short sleeves are inserted into said through holes from two ends of said through holes respectively.

11. The handle and wheel linked foldable trolley according to claim 2, wherein the movable wheel support is provided with removable or non-removable tiles; or the wheel support comprises a fixed wheel support fixed on the frame main body, and a detachable or non-detachable vehicle tile is arranged on the fixed wheel support.

12. The handle and wheel linked foldable trolley according to claim 2, wherein the wheel support is provided with a brake device.

13. The handle and wheel linked foldable trolley according to claim 12, wherein the brake device comprises a foot-operated portion hinged to the wheel support, the foot-operated portion is provided with a brake catch portion, the wheel on the wheel support is provided with a brake catch groove for allowing the brake catch portion to be caught or withdrawn, the foot-operated portion swings in one direction to allow the brake catch portion to enter the brake catch groove and swings in the opposite direction to allow the brake catch to be withdrawn from the brake catch groove; or, brake equipment steps on the portion including the foot that articulates on the wheel support, the foot is stepped on and is equipped with the brake draw-in groove in the portion, be equipped with the card on the wheel support and go into or withdraw from the brake card portion of brake draw-in groove, the foot is stepped on the portion and is made brake card portion get into the brake draw-in groove, make the brake card withdraw from the brake draw-in groove to a direction swing.

14. The handle and wheel linked foldable trolley according to claim 13, wherein the side of the wheels is integrally or separately provided with a mounting plate, the brake slots are circumferentially distributed on the mounting plate, and the center of the circumference is consistent with the center of the wheel axle of the wheels.

15. The pull handle and wheel linked foldable wagon of any one of claims 1-14, wherein the frame body further comprises a standing structure such that the foldable wagon can stand when folded.

16. The pull handle and wheel linked foldable wagon of claim 15, wherein the frame body comprises a first portion and a second portion, the first portion and the second portion move relative to each other during folding of the frame body, the standing structure comprises a support leg and a connecting rod movably connected to the support leg, the support leg and the connecting rod are respectively hinged to the first portion and the second portion, and when the frame body is folded, the first portion and the second portion move relative to each other and the connecting rod drives the support leg to prop up the frame body to stand the foldable wagon; when the frame main body is unfolded, the first part and the second part move relatively and drive the supporting legs to be put down through the connecting rods.

17. A handle and wheel linked foldable wagon as claimed in claim 16, wherein the frame body comprises two hinged members hinged to each other, and the leg and the link are hinged to the two hinged members, respectively.

18. A handle and wheel linked foldable wagon as claimed in claim 16 or 17, wherein the legs are chevron-shaped legs.

19. A handle and wheel linked foldable wagon as claimed in claim 16 or 17, wherein the standing structure comprises two sets of legs.

20. A pull handle and wheel linked foldable wagon as claimed in any one of claims 1-14, wherein the frame body comprises a front frame, a rear frame, a left frame, a right frame and a bottom frame, the left and/or right frames having side hinge mechanisms by which the frame body side portions can be folded or unfolded back and forth, the bottom frame having a bottom hinge mechanism by which the frame body bottom portion can be folded or unfolded back and forth.

21. The handle and wheel linked foldable wagon of claim 20, wherein the side hinge mechanism comprises a first hinge rod, a second hinge rod, a third hinge rod and a fourth hinge rod, the first hinge rod and the second hinge rod are hinged to form an X-shaped structure, the third hinge rod and the fourth hinge rod are hinged to form an X-shaped structure, the bottom end of the first hinge rod is hinged to the bottom end of the third hinge rod, and the top end of the second hinge rod is hinged to the top end of the fourth hinge rod; the top end of the first hinge rod is hinged with the front side frame, or the top end of the first hinge rod is connected with the front side frame through an intermediate piece, and the intermediate piece is hinged with the first hinge rod and the front side frame respectively; the bottom end of the second hinge rod is hinged with the front side frame, or the bottom end of the second hinge rod is connected with the front side frame through an intermediate piece, and the intermediate piece is hinged with the second hinge rod and the front side frame respectively; the top end of the third hinge rod is hinged with the rear side frame, or the top end of the third hinge rod is connected with the rear side frame through an intermediate piece, and the intermediate piece is respectively hinged with the third hinge rod and the rear side frame; the bottom end of the fourth hinged rod is hinged to the rear side frame, or the bottom end of the fourth hinged rod is connected with the rear side frame through an intermediate piece, and the intermediate piece is hinged to the fourth hinged rod and the rear side frame respectively.

22. The handle and wheel linked foldable cart of claim 21, wherein the top end of the first hinge rod is connected to the front frame via an intermediate member, the intermediate member is hinged to the first hinge rod and the front frame, the bottom end of the second hinge rod is hinged to the front frame, the top end of the third hinge rod is connected to the rear frame via an intermediate member, the intermediate member is hinged to the third hinge rod and the rear frame, the hinge point of the intermediate member to the third hinge rod is lower than the hinge point of the intermediate member to the rear frame, the bottom end of the fourth hinge rod is hinged to the rear frame, and in the unfolded state, the hinge point of the intermediate member to the first hinge rod is lower than the hinge point of the intermediate member to the front frame.

23. The handle and wheel linked foldable wagon of claim 20, wherein the bottom hinge mechanism comprises two support frames with inner ends hinged to each other, wherein one support frame is hinged at an outer end to one of the front side frame, the left side frame and the right side frame, and the other support frame is hinged at an outer end to the other of the front side frame, the left side frame and the right side frame.

24. The handle and wheel linked foldable trolley according to claim 23, wherein the two support frames are folded upwards during folding of the frame body, and in the unfolded state, the hinge point at the inner ends of the support frames is lower than the hinge point at the outer ends of the support frames.

25. A handle and wheel linked foldable wagon as claimed in claim 21, wherein a support member is connected between the left and right side frames for supporting the unfolded bottom frame.

26. A handle and wheel linked foldable wagon according to claim 25, wherein the support member is integrally formed with the two first hinge bars of the left and right side frames, or the support member is integrally formed with the two third hinge bars of the left and right side frames, or the support member is integrally formed with the first hinge bar of the left side frame and the third hinge bar of the right side frame, or the support member is integrally formed with the third hinge bar of the left side frame and the first hinge bar of the right side frame.

27. A handle-and-wheel linked foldable wagon as claimed in claim 21, wherein the middle piece at the front or rear side frame is extended outwardly to form a basket frame foldable with the frame body.

28. The handle and wheel linked foldable wagon of claim 21, wherein the second hinge bar of the left side frame is fixedly connected to the second hinge bar of the right side frame by a connecting portion, and the front wheel assembly is disposed on the connecting portion; and/or the fourth hinged rod of the right side frame is fixedly connected with the fourth hinged rod of the right side frame through a connecting part, and the rear wheel assembly is arranged on the connecting part.

29. A pull handle and wheel linked foldable wagon as claimed in claim 21, wherein the front wheel assembly is provided on the front frame; and/or the rear wheel assembly is provided on the rear side frame.

30. The pull handle and wheel linked foldable wagon of claim 20, wherein the frame body has a storage bag therein, the storage bag having a bottom surface, a front side surface, a rear side surface, a left side surface and a right side surface, the bottom surface being connected to the bottom frame, the storage bag having a pull portion on an inner bottom surface thereof, the pull portion being pulled upward to fold the bottom frame upward to fold the frame body.

31. The handle and wheel linked foldable trolley according to claim 20, further comprising a ceiling, wherein retractable or reversible ceiling support rods are provided at four corners of the frame body, and the ceiling is mounted on the ceiling support rods.

32. A handle and wheel linked foldable wagon as claimed in claim 31, wherein the top of the roof support bar is provided with a thickened anti-slip member to prevent the roof from being removed.

33. A handle and wheel linked foldable wagon as claimed in claim 31, wherein the ceiling pole is a telescopic ceiling pole, the top end of which is tilted outwards to tension the ceiling.

34. A handle and wheel linked foldable hand truck according to claim 31, wherein the roof support bar is a roof support bar that is extendable and retractable with respect to the frame body, and a slip prevention member is provided between the roof support bar and the frame body to prevent the roof support bar from slipping and retracting with respect to the frame body after being extended.

35. A handle and wheel linked foldable wagon as claimed in claim 20, wherein the frame body comprises a removable basket frame.

36. The handle and wheel linked foldable trolley according to claim 20, wherein the frame body is provided with a locking structure to lock the frame body after folding.

37. The handle and wheel linked foldable trolley according to claim 36, wherein the frame body comprises a first portion and a second portion, the first portion and the second portion move relatively during the folding of the frame body, the latch structure comprises a locking plate with a latch groove and a latch portion, the locking plate is arranged on the first portion, the latch portion is arranged on the second portion, one end of the locking plate, facing the latch portion, is provided with a guide surface for guiding the latch portion to enter the latch groove, the locking plate is elastically resettable, or the latch portion is a retractable latch portion, during the folding of the frame body, the first portion and the second portion move relatively, the locking plate and the latch portion move relatively, and the latch portion is locked after being folded by the guide surface being clamped into the latch groove.

38. The handle and wheel linked foldable trolley according to claim 37, wherein the left or right side frame comprises a first portion and a second portion, the locking plate is a plastic sheet fixed on the first portion, the plastic sheet is an elastic plastic sheet that can swing left and right under the action of external force and can be restored by its own elasticity after the external force is removed, the locking grooves penetrate through the left and right ends of the elastic plastic sheet, and one end of the locking plate facing the locking part is bent outward to form a guide surface for guiding the locking part into the locking grooves.

39. A handle and wheel linked foldable hand truck according to any one of claims 1 to 14, wherein the handle assembly comprises a rotatable seat rotatably mounted on the frame body and a handle hinged to the rotatable seat and capable of swinging back and forth, and an energy storage device is provided between the handle and the rotatable seat, the energy storage device having a force on the handle to swing the handle in the direction of the frame body.

40. A foldable hand truck with a handle and wheels in linkage according to claim 39, characterized in that the frame body is provided with a fixing portion for fixing the handle.

41. A handle and wheel linked foldable trolley according to claim 40, wherein the fixed part is a snap with a catch on the frame body.

42. A handle and wheel linked foldable wagon as claimed in claim 39, wherein the handle is a length adjustable handle.

43. A handle and wheel linked foldable wagon as claimed in claim 39, wherein the handle is a retractable or foldable handle.

44. A foldable hand truck with a handle and wheels in combination according to claim 43, wherein the handle comprises a lower handle part and an upper handle part slidably connected to the lower handle part, one of the lower handle part and the upper handle part is provided with a detent groove, and the other is provided with a detent part which can be inserted into or withdrawn from the detent groove.

45. A handle and wheel linked foldable trolley according to claim 44, wherein the upper handle portion is sleeved inside the lower handle portion, a pulling buckle is provided on the lower handle portion, the clamping portion is provided on the pulling buckle, the pulling buckle is pulled, the clamping portion can be inserted into or withdrawn from the clamping groove, an energy storage device is provided between the lower handle portion and the pulling buckle, and the energy storage device exerts an action force on the pulling buckle to move the clamping portion into the clamping groove.

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