DE202023100551U1 - Cart foldable in four directions - Google Patents

Abstract

A four-way foldable cart comprising a frame assembly, the frame assembly comprising:
a telescoping handle bar assembly (10), the telescoping handle bar assembly (10) comprising a handle (11), a telescoping drawbar (12) and two side bars (13); the handle (11) being installed at the top of the telescoping drawbar (12); the upper ends of the two side rods (13) are symmetrically connected to each other on either side of the lower end of the drawbar (12); and the lower ends of the two side bars (13) are riveted to a handle bar attachment seat, respectively;
two front wheel carrier assemblies (20), each front wheel carrier assembly (20) comprising a vertical column (21), a front wheel carrier (22) and a tire (23) sequentially connected to each other from top to bottom; the vertical column having an upper end connected to an upper mounting seat (100) and a lower end connected to the handlebar mounting seat;
two rear wheel carrier assemblies (30), each rear wheel carrier assembly (30) comprising a vertical column (21), a rear wheel carrier (32) and a tire (23) sequentially connected to each other from top to bottom; the top end of the vertical column being connected to the top mounting seat (100) and a bottom end being connected to a bottom mounting seat;
two sidewall assemblies (40), said sidewall assemblies (40) including two first X-shaped connecting rod mechanisms; two adjacent ends of the two first X-shaped connecting rod mechanisms are hinged to each other; upper end parts on both sides are riveted to an upper mounting seat, respectively, and lower end parts on both sides are riveted to the handlebar mounting seat and the lower mounting seat, respectively;
said first X-shaped connecting rod mechanisms comprising two tubular fittings (52,72) cross-riveted to form an X-shaped structure and a connector between the upper half of a pipe fitting is disposed adjacent to the wheel support assembly and the wheel support assembly;
a pivot piece (43) is arranged at the pivoted position of the two first X-shaped connecting rod mechanisms;
a front wall assembly (50), said front wall assembly (50) comprising a second X-shaped connecting rod mechanism (51), and the end portion of said second X-shaped connecting rod mechanism directly connected to said upper mounting seat and said handle bar- Fixing seat of a car body is riveted;
a rear panel assembly (60), the rear panel assembly (60) having the same structure as the front panel assembly;
a base assembly (70), said base assembly (70) including a third X-shaped connecting rod mechanism (72), and four end portions of said third X-shaped connecting rod mechanism each directly connected to two handlebar mounting seats (80) and two lower fixing seats (90) are riveted;
two handlebar mounting seats (80), one handlebar mounting seat (80) being a mounting pivot for connecting the vertical columns (21), the front wheel carriers, the handlebar assembly (10), the front wall assembly (50), the sidewall assemblies (40) and the base assembly (70);
two lower mounting seats (90), one lower mounting seat (90) being a mounting pivot for connecting the vertical columns (21), the rear wheel carriers, the side wall assemblies (40), the rear wall assembly (60) and the substructure - assembly (70);
four top mounting seats (100), two front top mounting seats (100) being mounting pivot points for connecting the vertical columns (21), side wall assemblies (40) and front wall assembly (50), and two rear top mounting seats mounting - are pivot points for connecting the vertical columns (21), the side wall assemblies (40) and the back wall assembly (60);
after the carriage has been folded, the upper ends of four vertical columns (21) are separated from the upper mounting seats (100); and after the trolley has been unfolded, the upper ends of the four vertical columns (21) are respectively inserted in corresponding holes of the upper attachment seats.

Description

TECHNICAL FIELD OF THE INVENTION

The utility model relates to the technical field of folding carts and relates in particular to a four-way foldable cart.

BACKGROUND OF THE INVENTION

With the improvement in living standards, living and leisure habits are also changing in a way that is hardly noticeable. At present, there are basically two types of conventional car structures. The first type is a two-way folding mechanism. Folding is convenient, but the volume after folding is large, storage and transportation take up a lot of space and do not make it easy to carry, and the capacity is small and not enough to meet the increasing use requirements of consumers. The other type is a four-way folding mechanism, and the volume occupies little space after folding, but the current four-way folding mechanism is relatively complex in structure, cumbersome to assemble and extremely high in production cost, relies more on plastic parts for the connection strength and cannot adapt to withstand high forces and weights, resulting in an extremely high proportion of products with poor consumer experience after sale.

With the increase in logistic transportation costs, manufacturers gradually preferred a cart with the four-way folding mechanism. Therefore, there is an urgent need to improve the foldable mechanism, reduce the production and processing costs while maintaining the fulfillment of the cart's stability and durability, and expand the functionality to meet the needs of customers.

DISCLOSURE OF THE INVENTION

In view of the shortcomings of the prior art, the aim of the utility model is to provide an improved four-way foldable cart. The utility model trolley has reasonable structural design, easy handling and assembly, full functions, and unlimited opportunity for expansion. At the same time, the special structural design gives the cart better stability and durability during use, improving the customer experience.

In order to achieve the above objective, the utility model adopts the following technical solution:

• eine ineinanderschiebbare Handgriffstangen-Anordnung, wobei die ineinanderschiebbare Handgriffstangen-Anordnung einen Handgriff, eine ineinanderschiebbare Zugstange und zwei Seitenstangen umfasst; wobei der Handgriff an dem oberen Ende der ineinanderschiebbaren Zugstange installiert ist; die oberen Enden der zwei Seitenstangen symmetrisch auf beiden Seiten des unteren Endes der Zugstange verbunden sind; und die unteren Enden der zwei Seitenstangen jeweils mit einem Handgriffstangen-Befestigungssitz vernietet sind;
• zwei Vorderrad-Trägeranordnungen, wobei jede Vorderrad-Trägeranordnung eine vertikale Säule, einen Vorderrad-Träger und einen Reifen umfasst, die von oben nach unten der Reihe nach miteinander verbunden sind; wobei das obere Ende der vertikalen Säule mit einem oberen Befestigungssitz verbunden ist, und ein unteres Ende mit dem Handgriffstangen-Befestigungssitz verbunden ist;
• zwei Hinterrad-Trägeranordnungen, wobei jede Hinterrad-Trägeranordnung eine vertikale Säule, einen Hinterrad-Träger und einen Reifen umfasst, die von oben nach unten der Reihe nach miteinander verbunden sind; wobei das obere Ende der vertikalen Säule mit dem oberen Befestigungssitz verbunden ist, und ein unteres Ende mit einem unteren Befestigungssitz verbunden ist;
• zwei Seitenwand-Anordnungen, wobei die Seitenwand-Anordnungen zwei erste X-förmige Verbindungsstangen-Mechanismen umfassen; wobei zwei benachbarte Enden der zwei ersten X-förmigen Verbindungsstangen-Mechanismen aneinander angelenkt sind; obere Endteile auf beiden Seiten jeweils mit einem oberen Befestigungssitz vernietet sind, und untere Endteile auf beiden Seiten jeweils mit dem Handgriffstangen-Befestigungssitz und dem unteren Befestigungssitz vernietet sind;
• wobei die ersten X-förmigen Verbindungsstangen-Mechanismen zwei Rohr-Armaturen umfassen, die kreuzweise vernietet sind, um eine X-förmige Struktur zu bilden, und ein Verbindungsstück zwischen der oberen Hälfte einer Rohr-Armatur benachbart zu der Rad-Trägeranordnung und der Rad-Trägeranordnung angeordnet ist;
• ein Drehstück an der angelenkten Position der zwei ersten X-förmigen Verbindungsstangen-Mechanismen angeordnet ist;
• eine Vorderwand-Anordnung, wobei die Vorderwand-Anordnung einen zweiten X-förmigen Verbindungsstangen-Mechanismus umfasst, und der Endteil des zweiten X-förmigen Verbindungsstangen-Mechanismus jeweils direkt mit dem oberen Befestigungssitz und dem Handgriffstangen-Befestigungssitz eines Wagenkörpers vernietet ist;
• eine Rückwand-Anordnung, wobei die Rückwand-Anordnung dieselbe Struktur wie die Vorderwand-Anordnung aufweist;
• eine Unterbau-Anordnung, wobei die Unterbau-Anordnung einen dritten X-förmigen Verbindungsstangen-Mechanismus umfasst, und vier Endteile des dritten X-förmigen Verbindungsstangen-Mechanismus jeweils direkt mit zwei Handgriffstangen-Befestigungssitzen und zwei unteren Befestigungssitzen vernietet sind;
• zwei Handgriffstangen-Befestigungssitze, wobei ein Handgriffstangen-Befestigungssitz ein Befestigungs-Schwenkpunkt zum Verbinden der vertikalen Säulen, der Vorderrad-Träger, der Handgriffstangen-Anordnung, der Vorderwand-Anordnung, der Seitenwand-Anordnungen und der Unterbau-Anordnung ist;
• zwei untere Befestigungssitze, wobei ein unterer Befestigungssitz ein Befestigungs-Schwenkpunkt zum Verbinden der vertikalen Säulen, der Hinterrad-Träger, der Seitenwand-Anordnungen, der Rückwand-Anordnung und der Unterbau-Anordnung ist;
• vier obere Befestigungssitze, wobei zwei vordere obere Befestigungssitze Befestigungs-Schwenkpunkte zum Verbinden der vertikalen Säulen, der Seitenwand-Anordnungen und der Vorderwand-Anordnung sind, und zwei hintere obere Befestigungssitze Befestigungs-Schwenkpunkte zum Verbinden der vertikalen Säulen, der Seitenwand-Anordnungen und der Rückwand-Anordnung sind;
• wobei, nachdem der Wagen gefaltet wurde, die oberen Enden von vier vertikalen Säulen von den oberen Befestigungssitzen getrennt sind; und nachdem der Wagen entfaltet wurde, die oberen Enden der vier vertikalen Säulen jeweils in entsprechende Löcher der oberen Befestigungssitze eingeführt sind.

A four-way foldable cart includes a frame assembly; wherein the frame assembly comprises:

• a telescoping handle bar assembly, the telescoping handle bar assembly including a handle, a telescoping pull bar, and two side bars; the handle being installed at the top of the telescoping drawbar; the upper ends of the two side rods are symmetrically connected on both sides of the lower end of the drawbar; and the lower ends of the two side bars are riveted to a handle bar attachment seat, respectively;
• two front wheel carrier assemblies, each front wheel carrier assembly comprising a vertical column, a front wheel carrier and a tire sequentially connected to each other from top to bottom; wherein the upper end of the vertical column is connected to an upper mounting seat and a lower end is connected to the handle bar mounting seat;
• two rear wheel carrier assemblies, each rear wheel carrier assembly comprising a vertical column, a rear wheel carrier and a tire sequentially connected to each other from top to bottom; wherein the upper end of the vertical column is connected to the upper mounting seat and a lower end is connected to a lower mounting seat;
• two sidewall assemblies, the sidewall assemblies including two first X-shaped connecting rod mechanisms; wherein two adjacent ends of the two first X-shaped connecting rod mechanisms are hinged to each other; upper end parts on both sides are riveted to an upper mounting seat, respectively, and lower end parts on both sides are riveted to the handlebar mounting seat and the lower mounting seat, respectively;
• the first X-shaped connecting rod mechanisms comprising two tubular fittings cross-riveted to form an X-shaped structure and a connector between the upper half of a tubular fitting adjacent the wheel support assembly and the wheel Carrier arrangement is arranged;
• a pivot piece is arranged at the pivoted position of the two first X-shaped connecting rod mechanisms;
• a front wall assembly, the front wall assembly comprising a second X-shaped connecting rod mechanism, and the end part of the second X-shaped connecting rod mechanism is directly riveted to the upper mounting seat and the handle bar mounting seat of a car body, respectively;
• a back panel assembly, the back panel assembly having the same structure as the front panel assembly;
• a base assembly, the base assembly including a third X-shaped connecting rod mechanism, and four end portions of the third X-shaped connecting rod mechanism are directly riveted to two handlebar attachment seats and two lower attachment seats, respectively;
• two handlebar mounting seats, one handlebar mounting seat being a mounting pivot point for connecting the vertical columns, the front wheel carriers, the handlebar assembly, the front wall assembly, the side wall assemblies, and the substructure assembly;
• two lower mounting seats, a lower mounting seat being a mounting pivot point for connecting the vertical columns, the rear wheel carriers, the sidewall assemblies, the rear wall assembly, and the underbody assembly;
• four upper mounting seats, two front upper mounting seats being mounting pivot points for connecting the vertical columns, the side wall assemblies and the front wall assembly, and two rear upper mounting seats being mounting pivot points for connecting the vertical columns, the side wall assemblies and the rear wall -arrangement are;
• wherein, after the carriage has been folded, the upper ends of four vertical columns are separated from the upper mounting seats; and after the carriage has been unfolded, the upper ends of the four vertical columns are respectively inserted into corresponding holes of the upper mounting seats.

As a further improvement of the technical solution, the lower end parts of the two side bars are provided with buckles; the buckles are riveted to the handlebar attachment seats; and after the cart has been folded, the telescoping handle bar assembly is clamped to the vertical columns of the front wheel carrier assemblies by the buckles. Or, when the cart is deployed without towing, the telescoping handlebar assembly can be clamped to the vertical columns of the front wheel carrier assemblies by the buckles to save space and eliminate potential safety hazards.

As a further improvement of the technical solution, the whole structure of the connector is similar to an H-type, and both ends are each provided with two branches; two branches at one end are used to encircle and be riveted to the tubular fitting of the first X-shaped connecting rod mechanism and two branches at the other end are used to encircle the vertical columns of the wheel carrier assemblies and to be riveted to; the connector is used for the sidewall assemblies to tighten the knuckle assemblies to achieve folding uniformity; and funnel-shaped bushings are provided at connecting positions of the lower end parts of the upper mounting seats and the vertical pillars, and the upper ends of the vertical pillars are provided with bullet-shaped plugs, which is convenient for precisely inserting the upper ends of the vertical pillars into the upper mounting seats for mounting , when the carriage is unfolded, so that four side walls of the carriage are connected into one, to improve the stability of the carriage.

As a further improvement in the technical solution, the car also includes a roof; the roof comprising four support poles and a roof shell; the lower ends of the four support rods are provided with detachable column heads, respectively; each column head is correspondingly inserted in the hole of the upper fixing seat; the upper attachment seat is designed to have deformability; and the position of the roof can be replaced with accessories at a later stage to add the functions of a table top, windbreak and mosquito net.

As a further improvement of the technical solution, slanting outward mounting holes are arranged on the column heads, and the lower ends of the support rods are inserted into the slanting mounting holes. The slanted holes are arranged in the column heads in such a way that the support rods are inclined outwards. In this way, after the roof panel is slid over the upper ends of the four support bars, the four support bars are in an outwardly inclined state to stretch the roof panel. The column heads are of split type construction and can be modified and extended at a later stage with the construction of the upper mounting seats.

As a further improvement of the technical solution, the car further includes a car body fabric cover, and the car body fabric cover is clamped in a rectangular cavity enclosed by the base assembly, the two side wall assemblies, the front wall assembly and the rear wall assembly becomes.

The folding method of the four-direction foldable car realizes the folding and collapsing by expansion and contraction in the directions of four side walls, namely, front, rear, left and right, with the left side wall and the right side wall respectively connected by two first X-shaped connecting rods- Mechanisms expand and contract that are connected end-to-end.

The front sidewall and rear sidewall expand and contract by only a second X-shaped connecting rod mechanism.

The end portion of each X-shaped connecting rod mechanism is directly riveted to the upper and lower attachment seats of the car body, respectively.

In a folding process, the upper ends of four vertical columns on the car body are separated from the corresponding upper mounting seats, respectively; and in an unfolding process, the upper ends of the four vertical columns are respectively inserted into the corresponding upper attachment seats.

For the four-way foldable cart of the utility model, the configuration of the double-walled vertical pillars of the existing four-way foldable cart is changed; the vertical column is just a single tube; in the folding process, the upper end of the vertical columns is separated and released from the upper fixing seats to realize the folding and collapsing; in the unfolding process of the foldable car, the top ends of four vertical columns are precisely and correspondingly inserted up into a hopper of the upper attachment seat; and meanwhile, in the unfolding process, by the pulling action of the vertical columns and the four connectors arranged on the side wall assemblies, the four vertical columns can be precisely positioned and set in place. In addition, the end part of each X-shaped connecting rod mechanism of the four-way foldable parts of the carriage in the utility model is directly riveted to the upper and lower attachment seats of the carriage body, respectively, without the need for further horizontal pipe fittings for a transition connection, thereby the foldable mechanism is simplified, the production and assembly costs are reduced, and the stability of the cart is improved.

1. 1. Erstens verwenden die vertikalen Säulen in dem Gebrauchsmuster Einzelrohr-Strukturen. In dem Faltungsprozess werden die oberen Enden der vertikalen Säulen von den oberen Befestigungssitzen getrennt und gelöst und werden während des Entfaltens jeweils präzise in die Löcher der oberen Befestigungssitze eingeführt. Dabei nützen die Verbindungsstücke zwischen den vertikalen Säulen und den Seitenwand-Anordnungen. Die vier Verbindungsstücke dienen dabei gleichzeitig für die Traktion, und die Seitenwand-Anordnungen treiben die Bewegung der vertikalen Säulen während des Faltens an, um eine Gleichmäßigkeit der Aktionen zu erzielen. Die oberen Enden der vertikalen Säulen sind in der Form eines Patronenkopfs konstruiert, und die Löcher der oberen Befestigungssitze sind in der Gestalt eines Trichters konstruiert, was der präzisen Einführung der vertikalen Säulen zuträglicher ist. Darüber hinaus verringern die vertikalen Säulen aus einer Einzelrohr-Struktur die Produktions- und Verarbeitungskosten beträchtlich und benötigen keine vertikale Säule in Hülsenform, wodurch die Erscheinung des herabfallenden Innenrohrs vermieden wird.
2. 2. In dem Gebrauchsmuster kommt die Höhe der Verbindungsteile der zwei Seitenstangen und der Zugstange in der Handgriffstangen-Anordnung der Höhe der Vorderwand-Anordnung nahe, und die gefalteten Klemmteile sind auf die Positionen der Handgriffstangen-Befestigungssitze eingestellt, so dass die Verwendungssteuerung der ineinanderschiebbaren Stangen freier ist, die Bedienung für Benutzer unterschiedlicher Größe bequem ist und die Struktur ästhetisch ansprechend und großzügig erscheint.
3. 3. In dem Gebrauchsmuster ist das Dach in einer abnehmbaren Bauform angeordnet; vier Stützstangen verwirklichen ein Plug-and-Play-Konzept, und die Kapazität des Wagens wird vergrößert; das Dach kann als Sonnen- und Regenschutz verwendet werden und ist ästhetisch ansprechend und praktisch; und gleichzeitig hält die Konstruktion der Säulenköpfe im Spalt-Typ einen einfachen Erweiterungsraum zur Hinzufügung der Funktionen eines Moskitonetzes, einer Tischplatte und eines Windschutzes für den Wagen bereit.

The utility model has the following beneficial effects:

1. 1. First, the vertical pillars in the utility model use single tube structures. In the folding process, the top ends of the vertical columns are separated and detached from the top mounting seats, and are respectively precisely inserted into the holes of the top mounting seats during unfolding. The connecting pieces between the vertical columns and the side wall arrangements are useful here. The four links simultaneously serve for traction, and the sidewall assemblies drive the movement of the vertical columns during folding for consistency of action. The upper ends of the vertical columns are designed in the shape of a cartridge head, and the holes of the upper mounting seats are designed in the shape of a funnel, which is more conducive to the precise insertion of the vertical columns. In addition, the vertical columns of a single-tube structure greatly reduce the production and processing costs, and do not require a sleeve-shaped vertical column, thereby avoiding the inner-tube falling phenomenon.
2. 2. In the utility model, the height of the connecting parts of the two side bars and the pull bar in the handle bar assembly is close to the height of the front wall assembly, and the folded clamping parts are adjusted to the positions of the handle bar attachment seats, so that the use control of the telescoping bars is freer, the operation is convenient for users of different heights, and the structure appears aesthetically pleasing and generous.
3. 3. In the utility model, the roof is arranged in a detachable configuration; four support bars realize plug and play concept, and the capacity of the cart is increased; the roof can be used for sun and rain protection and is aesthetically pleasing and practical; and at the same time, the construction of the column heads in the split type keeps an easy extension space ready to add the functions of a mosquito net, a table top and a windbreak for the car.

character list

• 1 Fig. 13 is a three-dimensional schematic diagram of an unfolded state of a four-way foldable cart provided by the utility model.
• 2 is a front view of 1 .
• 3 is a side view of 1 .
• 4 is a top view after 1 .
• 5 Fig. 13 is a three-dimensional schematic diagram of a half-unfolded state of a four-way foldable cart provided by the utility model.
• 6 is a front view of 5 .
• 7 is a side view of 5 .
• 8th is a top view after 5 .
• 9 is a locally enlarged view from position A in 1 .
• 10 is a locally enlarged view from position B in 5 .
• 11 is a locally enlarged view of position C in 1 .
• 12 Figure 13 is an exploded view of the connection of a support rod.
• 13 Fig. 13 is a three-dimensional schematic diagram of an unfolded state of an assembled cloth cover of a four-way foldable cart provided by the utility model.

Reference List

10

telescoping handlebar assembly

11

handle

12

telescopic drawbar

13

side bar

14

buckle

15

connection part

20

Front wheel carrier assembly

21

vertical column

22

Front carrier

23

Tires

30

Rear wheel carrier arrangement

32

rear carrier

40

side panel arrangement

41

pipe fitting

42

connector

43

Plastic swivel

50

front panel arrangement

51

second X-shaped connecting rod mechanism

52

pipe fitting

60

rear panel arrangement

70

substructure arrangement

71

third X-shaped connecting rod mechanism

72

pipe fitting

73

liaison seat

80

Handle bar mounting seat

90

lower mounting seat

100

upper mounting seat

101

funnel-shaped socket

200

Roof

201

support rod

202

roof shell

203

pillar head

204

mounting hole

211

Plug

300

Wagon body textile cover

DETAILED DESCRIPTION

The technical solutions in the embodiments of the utility model are described below clearly and fully in combination with the drawings in the embodiments of the utility model. Of course, the described embodiments are only part of the embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all further embodiments that a person skilled in the art arrives at without further creative effort will fall within the scope of protection of the utility model.

With reference to 1 until 13 Fig. 1 is an embodiment provided by the utility model: A four-way foldable cart includes a frame assembly. The frame assembly includes a telescoping handlebar assembly 10, two front wheel carrier assemblies 20, two rear wheel carrier assemblies openings 30, two side wall assemblies 40, a front wall assembly 50, a rear wall assembly 60, a base assembly 70, two handle bar mounting seats 80, two lower mounting seats 90 and four upper mounting seats 100. The four-way foldable cart comprises further a roof 200 and a car body cloth cover 300; and the roof 200 comprises four support poles 201 and a roof shell 202. As in FIG 12 shown are the lower ends of the four support rods 201 each provided with detachable column heads 203; and each column head 203 is inserted into the hole of the upper mounting seat 100, respectively. The cart body fabric cover 300 is clipped into a rectangular cavity which is enclosed by the underbody assembly 70, the two side wall assemblies 40, the front wall assembly 50 and the rear wall assembly 60. The outside of the bottom of the car body cloth cover 300 is provided with a pull-buckle, which is connected to a connecting seat 73 of the base assembly 70, and the inside of the bottom is provided with a pull handle for pulling the base assembly 70 when the car body is folded.

As a further improvement of the above embodiment: slanting outward mounting holes 204 are provided on the column heads 203, and the lower ends of the support rods 201 are inserted into the slanting mounting holes 204. FIG. The oblique holes are arranged in the column heads 203 so that the support rods 201 are inclined outward. After the roof panel 202 is put on the upper ends of the four support rods 201, the four support rods 201 are in an outwardly inclined state to stretch the roof panel 202.
The telescoping handle bar assembly 10 comprises a handle 11, a telescoping drawbar 12 and two side bars 13; the handle 11 is installed at the top of the telescoping drawbar 12; the upper ends of the two side rods 13 are connected symmetrically on either side of the lower end of the drawbar; a connecting part 15 is arranged between the telescoping drawbar 12 and the two side bars 13; and the lower ends of the two side bars 13 are riveted to the handle bar attachment seats 80, respectively. As in 11 shown are the lower end parts of the two side bars 13 provided with buckles 14; the buckles 14 are riveted to the handle bar attachment seats 80; and after the cart has been folded, the telescoping handle bar assembly is clamped to the vertical columns 21 of the front wheel carrier assemblies by the buckles 14.

Or, if a handlebar does not require a pulling action, the telescoping handlebar assembly 10 is clamped to the vertical posts 21 of the front wheel carrier assemblies by the buckles 14 to reduce the space occupied and so potential safety hazards such as tripping others, to eliminate. The height of the telescoping bars of a telescoping handle bar 12 can be adjusted by the connecting portion 15 of the two side bars and the tie bar in the handle bar assembly 10 so as to facilitate manipulation by different people and reduce the folding size.

Each front wheel carrier assembly 20 comprises a vertical column 21, a front wheel carrier 22 and a tire 23 connected to each other in order from top to bottom; the upper end of the vertical column 21 is connected to an upper mounting seat 100 and a lower end is connected to the handlebar mounting seat 80 .

Each rear wheel carrier assembly 30 comprises a vertical column 21, a rear wheel carrier 32 and a tire 23 connected to each other in order from top to bottom; and the upper end of the vertical column 31 is connected to the upper mounting seat 100 and a lower end is connected to a lower mounting seat 90 .

The sidewall assemblies 40 include two first X-shaped tie bar mechanisms; two adjacent ends of the two first X-shaped connecting rod mechanisms are hinged to each other; upper end parts on both sides are riveted to an upper mounting seat 100, respectively, and lower end parts on both sides are riveted to the handle bar mounting seat 80 and the lower mounting seat 90, respectively.

The first X-shaped connecting rod mechanisms comprise two tubular fittings 41 cross-riveted to form an X-shaped structure, and a connector 42 is connected between the upper half of a tubular fitting adjacent the wheel support assembly and the Arranged wheel carrier assembly. A plastic pivot piece 43 is located at the pivoted position of the two first X-shaped connecting rod mechanisms.

As in 9 shown is the whole structure of the connector 42 similar to an H type, and both ends are provided with two branches respectively; two junctions at one end are used to encircle and be riveted to the tubular fitting 41 of the first X-shaped connecting rod mechanism and two branches at the other end are used to encircle and to the vertical columns 21 of the wheel carrier assemblies to be riveted. Riveting refers herein to rotary riveting. In the process of folding and unfolding the cart, both ends of the connector 42 can be rotated about components connected to the connector. The fastener 42 is used for the sidewall assemblies 40 to tighten the knuckle assembly to achieve folding uniformity. In embodiments of the utility model, in the folding process of the car, the upper ends of the vertical columns 21 are separated and detached from the upper mounting seats 100, and they are respectively precisely inserted into the corresponding holes of the upper mounting seats 100 when unfolding. This process takes advantage of the fact that the four links 42 serve simultaneously for traction; and the tube fittings 41 of the sidewall assemblies 40 power the movement of the vertical columns 21 during folding to achieve uniformity of action. Moreover, the vertical pillars 41 of a single-pipe structure greatly reduce the production and processing costs and do not require a sleeve-shaped vertical pillar, thereby avoiding the inner-pipe falling phenomenon.

Moreover, as a further improvement of the above embodiment, in order to more conveniently insert the upper ends of the vertical columns 21 into the upper mounting seats, funnel-shaped bushings 101 are arranged at connection positions of the lower end parts of the upper mounting seats 100 and the vertical columns 21, and the upper ends of the vertical Columns 21 are provided with bullet-shaped plugs 211, which is convenient for precisely inserting the upper ends of the vertical columns into the upper mounting seats 100 for attachment when the carriage is deployed.

The front wall assembly 50 includes a second X-shaped connecting rod mechanism 51; the second X-shaped connecting rod mechanism 51 comprises two pipe fittings 52 cross-riveted to form an X-shaped structure; the end portions of the pipe fittings 52 are directly riveted to the upper mounting seat 100 and the handlebar mounting seat 80 of a car body, respectively; and the rear panel assembly 60 has the same structure as the front panel assembly 50.

The base assembly 70 includes a third X-shaped connecting rod mechanism 71; the third X-shaped connecting rod mechanism 71 comprises four pipe fittings 72 articulated to form an X-shape; four end parts of the four pipe fittings 72 converging at one point are provided with a connection seat 73, and the four pipe fittings converging at one point through the connection seat 73; the four pipe fittings 72 are rotatably connected to the connecting seat 73; and another four end parts of the pipe fittings 72 are directly riveted to two handlebar attachment seats 80 and two lower attachment seats 90 of the carriage body, respectively. When the carriage is folded, the connecting seat 73 is pulled and four converging end parts of the four tube fittings 72 rotate around the connecting seat 73 and move up, while four diverging end parts move down to converge and the handlebar attachment seats 80 and to drive the lower attachment seats 90 to converge and collapse to realize the folding.

A handlebar mounting seat 80 is a mounting pivot point for connecting the vertical columns 21, front wheel carriers 22, telescoping handlebar assembly 10, front panel assembly 50, side panel assemblies 40 and base assembly 70; and each connection position is provided with rivet attachment holes, respectively, for riveting and fixing with corresponding connection components.

A lower mounting seat 90 is a mounting pivot point for connecting the vertical columns 21, the rear wheel carriers 32, the side wall assemblies 40, the rear wall assembly 60 and the underbody assembly 70; and each connection position is provided with rivet attachment holes, respectively, for riveting and fixing with corresponding connection components.

Of the four upper mounting seats 100, two front upper mounting seats are mounting pivot points for connecting the vertical columns 21, the side wall assemblies 40 and the front wall assembly 50, and two rear upper mounting seats are mounting pivot points for connecting the vertical columns 21, the side wall assemblies 40 and the rear wall assembly 60. Each connecting position of the four upper mounting seats 100 is provided with rivet mounting holes, respectively, for riveting and fastening with corresponding connecting components.

As in 5 shown after the cart has been folded are the tops of four vertical columns 21 separated from the upper mounting seats 100. After the cart has been unfolded, as in 1 shown, the upper ends of the four vertical columns 21 are inserted into corresponding holes of the upper mounting seats 100, respectively. This saves considerable costs; and at the same time, four corners of the frame body are connected in series, increasing the stability of the carriage and making the structure simple and extraordinary.

For the four-way foldable cart in the embodiment of the utility model, the vertical columns 21 are constructed in the form of individual tubes; in the folding process, the upper ends of the vertical columns are separated and detached from the upper attachment seats 100 to realize the folding and collapsing; in the unfolding process, the top ends of four vertical columns 21 are inserted precisely and correspondingly up into funnels of the upper attachment seat 100; and in the folding and unfolding process, the four vertical columns 21 can be precisely positioned by the traction driving action of the four connectors 42 . The upper ends of the vertical columns 21 are designed in the shape of a cartridge head, and the holes of the upper attachment seats 100 are designed in the shape of a funnel, which is more conducive to the precise insertion of the vertical columns 21. In addition, the vertical columns 21 of a single-tube structure significantly reduce the production and processing costs. Moreover, in the embodiment, the roof 200 is arranged in a detachable configuration; four support rods 201 realize a plug and play concept, and the capacity of the car is increased; the roof 200 can be used for sun and rain protection and is aesthetically pleasing and practical; and at the same time, the split-type construction of the column heads 203 provides easy expansion space for adding the functions of a mosquito net, a table top and a windbreak for the car.

The folding method of the four-direction foldable cart in the above embodiment realizes the folding and collapsing by expansion and contraction in the directions of four side walls, namely front, back, left and right: the left side wall and the right side wall expand and contract by two respectively first X-shaped connecting rod mechanisms connected end to end; the front side wall and the rear side wall expand and contract by only a second X-shaped connecting rod mechanism; the end portion of each X-shaped connecting rod mechanism is directly riveted to the upper and lower attachment seats of the car body, respectively; in a folding process, the upper ends of four vertical pillars on the car body are separated from the corresponding upper mounting seats, respectively; and in an unfolding process, the upper ends of the four vertical columns are respectively inserted into the corresponding upper attachment seats.

Specifically, the folding and unfolding processes of the four-way foldable cart in the present embodiment are as follows:

As in 5 shown, during folding and collapsing, the connecting seat 73 is pulled up, and four converging end parts of the four pipe fittings 72 connected to the connecting seat 73 rotate around the connecting seat 73 and move upward, while four diverging end parts rotate move down to converge and pull two handle bar attachment seats 80 and two bottom four corner attachment seats 90 to converge together and fold inward. The connected tires 23 and upper mounting seats 100 fold inward together to push the tube fittings 41 of the sidewall assemblies 40 to mutually fold. At this moment, the four connectors 42 pull the vertical columns 21, pulling them with them; the upper ends of the vertical columns 21 are separated from the upper mounting seats 100 in the process of moving; meanwhile, the pipe fittings corresponding to the front wall assembly 50 and the rear wall assembly 60 are also alternately folded and finally folded and folded until the front and rear tires come into contact with each other; and the telescoping handlebar assembly 10 is contracted and then clamped to the vertical columns 21 of the front wheel support assemblies 20.

As in 1 shown, the process during deployment is exactly the reverse of the above. The connection seat 73 is pulled down, and four converging end parts of the four pipe fittings 72 connected to the connection seat 73 rotate around the connection seat 73 and move down, while four diverging end parts move up to rotate and pull two handle bar attachment seats 80 and two lower four-corner attachment seats 90 to spread apart together. The joined tires 23 and upper mounting seats 100 move apart together to reveal the sidewall tube fittings 41. Assemblies 40 to slide so that they unfold outwards. At this moment, the four connectors 42 pull the vertical columns 21, pulling them with them; the upper ends of the vertical columns 21 are inserted into the upper mounting seats 100 in the process of moving; and meanwhile, the pipe fittings corresponding to the front wall assembly 50 and the rear wall assembly 60 are also stretched and unfolded outward until the whole car body is completely in a state after 1 is unfolded.

In the above folding and unfolding processes, the telescoping handlebar assembly 10 is independently operated and expanded and contracted according to actual needs without the need for linkage to the operation of the cart body. In the folding process, the telescoping drawbar 12 is retracted and clamped to the vertical columns 21 by buckles 14 . After deployment, when the cart is not to be towed, the telescoping handle bar assembly 10 does not need to be deployed and is clamped to the vertical columns 21 by the buckles 14 to reduce space occupied and potential safety hazards such as tripping others to bring, to remove. It is only when the carriage is pulled for movement that the telescoping drawbar 12 is opened and the buckles 14 are separated from the vertical columns 21; and the height is adjusted to match the height of the people pulling for the operation.

Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model in any way. Although the utility model has been described in detail with reference to the above embodiment, those skilled in the art can still modify the technical solution stated in the above embodiment or substitute some of the technical features in an equivalent manner. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the utility model should therefore be included in the scope of protection of the utility model.

Claims (6)

A four-way foldable cart comprising a frame assembly, the frame assembly comprising: a telescoping handle bar assembly (10), the telescoping handle bar assembly (10) including a handle (11), a telescoping drawbar (12), and two side bars (13 ) includes; the handle (11) being installed at the top of the telescoping drawbar (12); the upper ends of the two side rods (13) are symmetrically connected to each other on either side of the lower end of the drawbar (12); and the lower ends of the two side bars (13) are riveted to a handle bar attachment seat, respectively; two front wheel carrier assemblies (20), each front wheel carrier assembly (20) comprising a vertical column (21), a front wheel carrier (22) and a tire (23) sequentially connected to each other from top to bottom; the vertical column having an upper end connected to an upper mounting seat (100) and a lower end connected to the handlebar mounting seat; two rear wheel carrier assemblies (30), each rear wheel carrier assembly (30) comprising a vertical column (21), a rear wheel carrier (32) and a tire (23) sequentially connected to each other from top to bottom; the top end of the vertical column being connected to the top mounting seat (100) and a bottom end being connected to a bottom mounting seat; two sidewall assemblies (40), said sidewall assemblies (40) including two first X-shaped connecting rod mechanisms; two adjacent ends of the two first X-shaped connecting rod mechanisms are hinged to each other; upper end parts on both sides are riveted to an upper mounting seat, respectively, and lower end parts on both sides are riveted to the handlebar mounting seat and the lower mounting seat, respectively; said first X-shaped connecting rod mechanisms comprising two tubular fittings (52, 72) cross-riveted to form an X-shaped structure and a connector between the upper half of a tubular fitting adjacent to the wheel Carrier assembly and the wheel carrier assembly is arranged; a pivot piece (43) is arranged at the pivoted position of the two first X-shaped connecting rod mechanisms; a front wall assembly (50), said front wall assembly (50) comprising a second X-shaped connecting rod mechanism (51), and the end portion of said second X-shaped connecting rod mechanism directly connected to said upper mounting seat and said handle bar- Fixing seat of a car body is riveted; a rear panel assembly (60), the rear panel assembly (60) having the same structure as the front panel assembly; a base assembly (70), the base assembly (70) including a third X-shaped connecting rod mechanism (72), and four end portions of the third X-shaped connecting rod gene mechanism are directly riveted to two handle bar attachment seats (80) and two lower attachment seats (90), respectively; two handlebar mounting seats (80), one handlebar mounting seat (80) being a mounting pivot for connecting the vertical columns (21), the front wheel carriers, the handlebar assembly (10), the front wall assembly (50), the sidewall assemblies (40) and the base assembly (70); two lower mounting seats (90), one lower mounting seat (90) being a mounting pivot for connecting the vertical columns (21), the rear wheel carriers, the side wall assemblies (40), the rear wall assembly (60) and the substructure - assembly (70); four top mounting seats (100), two front top mounting seats (100) being mounting pivot points for connecting the vertical columns (21), side wall assemblies (40) and front wall assembly (50), and two rear top mounting seats mounting - are pivot points for connecting the vertical columns (21), the side wall assemblies (40) and the back wall assembly (60); after the carriage has been folded, the upper ends of four vertical columns (21) are separated from the upper mounting seats (100); and after the carriage has been unfolded, the upper ends of the four vertical columns (21) are respectively inserted into corresponding holes of the upper mounting seats. Cart foldable in four directions claim 1 wherein the lower end parts of the two side bars (13) are provided with buckles (14); the buckles (14) being riveted to the handle bar attachment seats (80); and when the cart is folded or unfolded without traction, the telescoping handlebar assembly (10) is clamped to the vertical columns (21) of the front wheel carrier assemblies (20) by the buckles (14). Cart foldable in four directions claim 1 wherein the entire structure of the connector (42) is similar to an H-type and both ends are provided with two branches respectively; whereby two branches are used at one end to encircle and be riveted to the tubular fitting of the first X-shaped connecting rod mechanism and two branches at the other end are used to connect the vertical columns (21) of the wheel carrier embracing assemblies (20, 30) and being riveted thereto; funnel-shaped bushes (101) are provided at connecting positions of the lower end parts of the upper mounting seats (100) and the vertical columns (21), and the upper ends of the vertical columns are provided with bullet-shaped plugs. Cart foldable in four directions claim 1 , further comprising a roof (200), said roof (200) comprising four support poles (201) and a roof shell (202); the lower ends of the four support rods being provided with detachable column heads (203), respectively; and each column head (203) is respectively inserted in the hole (204) of the upper attachment seat (100). Cart foldable in four directions claim 4 wherein slanting outwardly directed mounting holes are provided on the column heads (203), and the lower ends of the support rods (201) are inserted into the slanting mounting holes. Cart foldable in four directions claim 1 , further comprising a body fabric cover (300), said body fabric cover (300) being clipped into a rectangular cavity defined by said underbody assembly (70), said two sidewall assemblies (40), said front wall assembly ( 50) and the backplane assembly (60).

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