CN217456036U - Folding bicycle - Google Patents

Abstract

The embodiment of the specification provides a folding trolley. This folding car includes: a folding frame assembly comprising the following components: the device comprises at least two upper connecting rods, at least two lower connecting rods, two vertical frame connecting rods, a central rod, at least two support rods and a composite hinge, wherein the upper connecting rods and the lower connecting rods are equal in length, the vertical frame connecting rods and the central rod are equal in length, and the two support rods are equal in length to form two groups of same parallelogram mechanisms; the two support rods and the composite hinge form a support rod mechanism; the components are movably connected with each other.

Description

Folding bicycle

Technical Field

This specification relates to the folding mechanism field, in particular to folding car.

Background

At present, the foldable portable carrier is used as a short-distance carrying tool, has the characteristics of small size and flexibility, and can complete short-distance carrying tasks in places where large-scale carrying instruments are inconvenient to use. The common carrier in the market generally comprises two or more groups of scissors mechanisms, and the carrier can be folded through the linkage effect of the scissors mechanisms so as to be convenient to store. However, the scissor fork mechanism of the existing carrier has the defects of excessive movable components, unstable stress, large noise caused by gaps among the components, heavy self-weight and the like.

SUMMERY OF THE UTILITY MODEL

One of the embodiments of the present specification provides a folding cart. This folding car includes: a folding frame assembly comprising the following components: the mechanism comprises at least two upper connecting rods, at least two lower connecting rods, two vertical frame connecting rods, a central rod, at least two support rods and a composite hinge, wherein the upper connecting rods and the lower connecting rods are equal in length, the vertical frame connecting rods and the central rod are equal in length, and the two support rods are equal in length to form two groups of same parallelogram mechanisms; the two support rods and the composite hinge form a support rod mechanism; the components are movably connected with each other.

In some embodiments, the upper link or the lower link is constrained by the parallelogram mechanism and the strut mechanism when being pulled, so that the components move synchronously to realize the folding action of the folding trolley.

In some embodiments, the upper link or the lower link is constrained by the parallelogram mechanism and the strut mechanism when pushed, such that the members move synchronously to effect the unfolding action of the folding cart.

In some embodiments, the compound hinge has a concave arc surface that cooperates with a coupling of the upper link in an operational state; the center rod passes through the center hole of the compound hinge.

In some embodiments, the folding cart includes one or two sets of the folding frame assemblies arranged in parallel.

In some embodiments, the foldable wagon further comprises two cargo frame bottoms connecting the lower links of the two sets of the foldable frame assemblies to form a lower frame type foldable wagon.

In some embodiments, the foldable vehicle further comprises a hanger for mounting a seat in the vehicle.

In some embodiments, the foldable vehicle further comprises two cargo frame bottoms connecting the upper links of the two sets of foldable frame assemblies to form an upper sill-type foldable vehicle.

In some embodiments, the folding cart further comprises one to four foldable or detachable enclosures.

In some embodiments, the folding cart further comprises a universal wheel assembly that is movably coupled to one of the stile links; the universal wheel assembly comprises a handle, a handle rod sleeve, a universal wheel frame, a bogie, a universal wheel shaft, an axial positioning piece and an axial limiting piece, wherein the components are movably connected with one another.

According to the structure of the folding bicycle, the folding frame assembly can be used for realizing the unfolding and folding of the folding bicycle, and the parallelogram mechanism can improve the stability of folding deformation, so that all components synchronously move to realize the folding or unfolding action. The parallelogram mechanism can be stably supported by the stay bar mechanism. The folding frame component has the advantages of less integral components and flexible connection, and is favorable for reducing the dead weight of the folding bicycle and reducing the moving noise between the components.

Drawings

The present description will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, and in these embodiments like numerals are used to indicate like structures, wherein:

FIG. 1 is a schematic illustration of a folding cart according to some embodiments of the present disclosure;

FIG. 2 is a partial schematic view of a folding cart in accordance with some embodiments herein;

FIG. 3 is a schematic illustration of a folding cart in a semi-folded configuration according to some embodiments of the present disclosure;

FIG. 4 is a schematic illustration of a folding cart in a fully folded configuration according to some embodiments of the present disclosure;

FIG. 5 is a schematic view of an upper link shown in accordance with some embodiments of the present description;

FIG. 6 is a schematic view of a first carrier unit according to some embodiments of the present description;

FIG. 7 is a schematic view of a folding cart according to some embodiments of the present disclosure;

FIG. 8 is a schematic diagram of a folding cart according to some embodiments of the present disclosure;

FIG. 9 is a schematic view of a lower link according to some embodiments of the present description.

Wherein the reference numerals are: 100. folding the vehicle; 1. an upper connecting rod; 110. a first end of an upper link; 120. a second end of the upper link; 131. connecting sheets; 2. a stay bar; 21. a first end of a strut; 22. a second end of the strut; 3. a center pole; 4. a first connecting member; 41. a convex arc surface; 5. a compound hinge; 51. a concave arc surface; 6. a vertical frame connecting rod; 7. a lower connecting rod; 71. a first end of a lower link; 72. a second end of the lower link; 8. a third connecting member; 9. a first carrier unit; 91. a fence; 911. a front rail; 912. a rear fence; 913. a left rail; 914. a right rail; 10. the bottom of the goods frame; 101. the bottom of the front goods frame; 102. the bottom of the rear goods frame; 11. an armrest rail; 111. a front handrail; 112. a rear handrail fence; 12. a wheel; 121. a universal wheel; 122. a fixed wheel; 13. a traffic control device; 15. a fixed wheel assembly; 161. a handle; 162. a handle bar; 163. a handle bar sleeve; 164. a universal wheel carrier; 165. a bogie; 166. a universal wheel shaft; 17. a second carrier unit; 18. a first auxiliary member; 19. a second auxiliary member.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the present description, and that for a person skilled in the art, without inventive effort, the present description can also be applied to other similar contexts on the basis of these drawings. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

As used in this specification and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.

Some embodiments of the present description provide a folding cart that may be used to handle items, for example, in a logistics transit station, outdoor camping, shopping, baggage transfer, and the like. Embodiments of the present description may also be applied in other scenarios.

FIG. 1 is a schematic diagram of a folding cart according to some embodiments of the present disclosure. It should be understood that the drawings in the embodiments of the present description are only schematic, and in some embodiments, the folding cart may not include some of the components in the drawings.

As shown in fig. 1, the present description provides a folding cart 100, the folding cart 100 including a folding frame assembly. The folding frame assembly comprises the following components: the device comprises at least two upper connecting rods 1, at least two lower connecting rods 7, two vertical frame connecting rods 6, a central rod 3, at least two supporting rods 2 and a composite hinge 5. Other components and connections shown in the drawings may be provided as embodiments, and corresponding parts may be omitted or otherwise implemented in some embodiments.

In some embodiments, the upper link 1 and the lower link 7 are equal in length, the stile link 6 and the center bar 3 are equal in length, and the two struts 2 are equal in length to form two identical sets of parallelogram mechanisms. Where stile links 6 and center pole 3 are equal in length, it is understood that stile links 6 may be of a length such that the length of the line between first end 110 of upper link 1 and first end 71 of lower link 7 is equal to the length of center pole 3. In some embodiments, the length of stile links 6 may be greater than central rod 3, and the distance between first end 110 of upper link 1 and first end 71 of lower link 7 is equal to the length of central rod 3. By constructing the folding frame assembly as a parallelogram mechanism, the opposite members are always kept parallel in the folding deformation process of the folding bicycle, and the angular displacement, the angular velocity and the angular acceleration of the upper connecting rod 1 and the lower connecting rod 7 in the rotation process are always equal, so that the stability of the folding deformation is improved.

In some embodiments, there are at least two upper links 1 that are the same length; there are at least two struts 2 of equal length; there are at least two lower links 7 of the same length. Thus, the upper connecting rod 1, the stay bar 2, the lower connecting rod 7 and the upright frame connecting rod 6 form a symmetrical structure relative to the central rod 3, so that the components on the two sides of the central rod 3 can keep synchronous movement in the folding and unfolding processes.

In some embodiments, two struts and a compound hinge comprise a strut mechanism. The stay mechanism can stably support the parallelogram mechanism.

In some embodiments, the members are all movably connected to each other, and the movable connection may include, but is not limited to, a hinge, a flexible connection, or a detachable connection. For more detailed connection of the respective members, reference may be made to the following detailed description.

According to the structure of the folding cart 100, the folding and unfolding of the folding cart 100 can be realized through the folding frame assembly, and the parallelogram mechanism can improve the stability of folding deformation, so that the components move synchronously to realize the folding or unfolding action. The parallelogram mechanism can be stably supported through the stay bar mechanism, and the bearing and the push-pull are convenient. The folding frame assembly has fewer integral components and flexible connection, and is favorable for reducing the dead weight of the folding bicycle 100 and reducing the moving noise among the components.

An exemplary embodiment of the various components of the folding cart 100 will be described in greater detail below in conjunction with fig. 1.

The stile links 6 are a support-like structure for connecting other components in the folding cart 100. In some embodiments, the stile links are configured as fixed posts. In some embodiments, the stile links are configured as a frame. The frame is formed by a plurality of rods through rigid connection. In some embodiments, the stile links are configured as fixed plates, which may be flat or curved plates. The stile links can also be other forms.

The upper link 1 is a load-bearing member of the folding cart 100. In some embodiments, the upper link 1 includes, but is not limited to, a bar, a planar frame, a space frame, a plate, or other shape, structure. In some embodiments, the upper link 1 may be directly load bearing, e.g., an item may be placed directly on the upper link 1. In some embodiments, the upper link 1 may indirectly bear the load, for example, the upper link 1 may be provided with other structures such as a basket, a box, a basket, a hook, a net or a bag, and the like, and the other structures are placed in the other structures to indirectly bear the load through the upper link 1. The upper link may also be weighted in other ways.

The lower link 7 is a load-bearing member of the folding cart 100. In some embodiments, the lower link 7 includes, but is not limited to, a rod, a planar frame, a space frame, a plate, or other shape, structure. In some embodiments, the lower link 7 may bear weight directly, e.g., an item may be placed directly on the lower link 7. In some embodiments, the lower link 7 may indirectly bear the weight, for example, the lower link 7 may be provided with other structures such as a basket, a box, a basket, a hook, a net or a bag, and the like, and the lower link 7 indirectly bears the weight of the object placed therein through the lower link 7. The lower link may also be weighted in other ways.

The stay 2 and the center pole 3 are members of the folding cart 100 that play a supporting role. The cross-section of the stay 2 and/or the cross-section of the central rod 3 include, but are not limited to, circular, oval, rectangular, T-shaped, i-shaped, L-shaped, in-line, etc. The struts 2 and the central rod 3 may be rigid or adjustable in length, straight or curved. A plate or other component acting like a rod may also serve as the stay 2 or the central rod 3. In some embodiments, the two upper links may be movably connected to each other by a first connecting member 4. In some embodiments, the first connector 4 may include, but is not limited to, a hinged structure, a rigid structure, a flexible connection structure, a telescoping structure, and the like.

In some embodiments, the first connecting member 4 and the compound hinge 5 are members of the folding cart 100 for connection and limiting. In some embodiments, the first link 4 and/or the compound hinge 5 may be a separate component from the other components of the foldable wagon 100 or may be integrally formed with any of the components of the foldable wagon 100. In some embodiments, the compound hinge 5 limits the movement of the center rod 3 in a particular direction (e.g., vertical). In some embodiments, the foldable wagon 100 is in an extreme state after the first link 4 and the compound hinge 5 are locked with other components at a certain position. In some embodiments, the folding frame assembly may further comprise a first auxiliary and a second auxiliary.

In some embodiments, the first auxiliary element may be the first connecting element 4. In some embodiments, the first auxiliary element 18 may be an intermediate member connecting the first connecting member 4 and the upper link 1, for example, as shown in fig. 2, and the first auxiliary element 18 may be a lever, a bent lever, or the like. In some embodiments, the first auxiliary element 18 may be a bent rod, which is bent from the upper link 1 to the central rod 3 and is movably connected to the central rod 3 by the first connecting element 4.

In some embodiments, the second auxiliary element may be the central rod 3. In some embodiments, the second auxiliary 19 may be an intermediate member connecting the central bar 3 and the second carrier 7, for example, as shown in fig. 7, the second auxiliary 19 may be a bar or the like.

The foldable vehicle 100 can be unfolded or folded according to the use condition, wherein the upper link 1, the stay 2, and the center rod 3 are provided as movable members in the foldable vehicle 100 to achieve the foldable performance of the foldable vehicle 100. In some embodiments, the first end 110 of the upper link 1, the first end 21 of the brace 2, and the first end 71 of the lower link 7 are each movably connected to the stile link 6. If the upper link 1 is a rod, the first end 110 of the upper link 1 may be any one of the two ends in the axial direction; if the upper link 1 is a planar frame or plate, the first end 110 of the upper link 1 can be any side thereof; if the upper link 1 is a space frame, the first end 110 of the upper link 1 may be any end surface thereof. The first end 21 of the stay 2 is either one of the axial ends thereof.

In some embodiments, "movably connected" includes, but is not limited to, hinged, flexible, or removably connected. In some embodiments, first end 110 of upper link 1 and/or first end 21 of brace 2 is hinged to stile link 6 by a hinge, pivot shaft, or the like; by means of the articulation, the upper link 1 and/or the stay 2 can be turned relative to the stile link 6. In some embodiments, the first end 110 of the upper link 1 and/or the first end 21 of the strut 2 are flexibly connected to the stile link 6 by a flexible joint, a connector with a spring isolation hinge, or the like; by means of the flexible connection, the upper link 1 and/or the stay 2 can be rotated relative to the stile link 6 while allowing a certain deformation between the members, with a shock-absorbing effect. In some embodiments, the first end 110 of the upper link 1 and/or the first end 21 of the strut 2 is removably connected to the stile link 6 by a snap, threaded fit, or the like; by being detachably connected, the upper link 1 and/or the stay 2 are/is conveniently detached from the stile link 6. In some embodiments, in the detachable connection mode, the relative angle between the upper connecting rod 1 and/or the stay bar 2 and the upright connecting rod 6 can be adjusted by adjusting the buckling position or the screwing depth and the like. In some embodiments, the removable connection may be in other ways.

In some embodiments, the second end 120 of the upper link 1 is connected to a first auxiliary member, which is the same as the first link 4 or is connected to the first link 4, and the first auxiliary member is movably connected to at least one of the upper link 1 or the first link 4. Wherein, like the first end 110 of the upper link 1, the second end 120 of the upper link 1 may be an end, a side, or an end thereof according to the configuration of the upper link 1. In some embodiments, the first auxiliary element is identical to the first connecting element 4, i.e. both can be one and the same component. For example, the first auxiliary element and the first connecting element 4 may be one and the same hinge or pivot axis. In some embodiments, the first auxiliary is a different component from the first connecting member 4.

In some embodiments, the first connection 4 may be a joint, a hinge or a pivot shaft. In some embodiments, the second end 120 of the upper link 1 is rotatably connected to the first link 4. In some embodiments, the second end 120 of the upper link 1 and the first connector 4 may also be detachably connected by a snap, a threaded fitting, or the like. The moveable connection may be in other ways.

In some embodiments, the second end 22 of the strut 2 is movably connected with the compound hinge 5. The second end 22 of the stay 2 is the other end of the two ends in the axial direction opposite to the first end. In some embodiments, the compound hinge 5 may be a hinge or a pivot shaft. In some embodiments, the second end 22 of the strut 2 is rotatably connected to the compound hinge 5. In some embodiments, the second end 22 of the strut 2 and the compound hinge 5 may also be removably connected by a snap, threaded fitting, or the like. The moveable connection may be in other ways.

In some embodiments, the first connector 4 is connected to the central rod 3, and the compound hinge 5 is slidably connected to the central rod 3.

In some embodiments, the first connector 4 may be rigidly connected with the central rod 3. For example, when the first connecting member 4 is a hinge, the hinge may comprise a fixed part and a rotating part, the central rod 3 being rigidly connected to the fixed part of the hinge, and the second end 120 of the upper link 1 being connected to the rotating part of the hinge. For another example, when the first connecting member 4 is a pivot shaft, the central rod 3 is rigidly connected to the pivot shaft, and the second end 120 of the upper connecting rod 1 is rotatably connected to the pivot shaft. In some embodiments, the first connector 4 is directly connected to the central rod 3. In some embodiments, the first connector 4 is indirectly connected to the central rod 3 by other means.

In some embodiments, the compound hinge 5 is provided with a central hole or sleeve through which the compound hinge 5 is sleeved on the central rod 3 so that the compound hinge 5 can slide relative to the central rod 3. In some embodiments, the compound hinge 5 is provided with a slider, and the central rod 3 is provided with a sliding slot extending in the axial direction, the slider being slidably embedded in the sliding slot so that the compound hinge 5 can slide relative to the central rod 3. In some embodiments, the compound hinge 5 is provided with a groove, and the central rod 3 is provided with a convex rail, and the groove is slidably coated on the convex rail, so that the compound hinge 5 can slide relative to the central rod 3. The sliding connection may also be in other ways.

In some embodiments, the second end 71 of the lower link 7 is connected to a second auxiliary element, which is identical to the central rod 3 or is connected to the central rod 3, the second auxiliary element being movably connected to at least one of the lower link 7 or the second support. In some embodiments, the second auxiliary element is the same component as the central rod 3. In some embodiments, the second auxiliary element is a different component from the central rod 3.

In some embodiments, the folding cart 100 includes one or two sets of parallel arranged folding frame assemblies. In some embodiments, the folding cart 100 may include two sets of linkages, one set on each of the left and right sides of the folding cart 100. In some embodiments, the folding cart 100 may include a set of linkages that are located at an intermediate position on the left and right sides of the folding cart 100. In some embodiments, the first auxiliary member may be a rod member, the left and right sides of the foldable vehicle 100 are respectively provided with two support rods 2, a central rod 3, two lower connecting rods 7, a first connecting member 4 and a composite hinge 5, the first auxiliary member extends along the left and right directions of the foldable vehicle 100, the left and right ends of the first auxiliary member are respectively fixedly connected with the central rod 3, the upper connecting rod 1 is disposed at the middle position of the foldable vehicle along the front and back directions of the foldable vehicle 100, and the second end 120 of the upper connecting rod 1 is movably connected with the first auxiliary member through the first connecting member 4.

According to the structural features and the connection relationship of the folding cart 100, the upper link 1, the stay 2, and the center rod 3 of the folding cart 100 are movably or slidably connected to each other to form a movable member, and the folding cart 100 can be changed in shape by relative rotation or sliding, for example, to have an unfolded state and a folded state. In some embodiments, when the upper link 1 or the lower link 7 is pulled, the parallelogram mechanism and the strut mechanism are restrained, so that the components move synchronously to realize the folding action of the folding cart 100.

In some embodiments, upon pushing the upper link 1 or the lower link 7, the parallelogram mechanism and the strut mechanism are constrained such that the members move in unison to effect the unfolding action of the folding cart 100.

The folding and unfolding actions of the folding cart 100 are realized through the synchronous movement of the components, and the folding operation of the folding cart 100 is simplified. And the folding frame assembly is a symmetrical parallelogram mechanism, so that the upright frame connecting rod 6 can be always vertical to the ground, the middle posture of the folding trolley 100 in the folding process can be kept in a standing posture, and the operation of a user is facilitated.

As shown in fig. 1, in some embodiments, the compound hinge 5 forms a stable connection with the first connector 4 after sliding up the center rod 3. Wherein, the stable connection can be that the relative position of the composite hinge 5 and the first connecting piece 4 is kept unchanged when the composite hinge 5 does not slide downwards. In some embodiments, the compound hinge 5 forms a stable connection in direct contact with the first connector 4. For example, the stable connection is achieved by the abutment of a concave structure (e.g., concave arc) and a convex structure (e.g., convex arc) provided on the first connecting member 4 and the compound hinge 5, respectively. In some embodiments, the compound hinge 5 forms a stable connection in indirect contact with the first connector 4. For example, a stable connection is achieved by intermediate structures such as joints, locking devices, etc.

When the compound hinge 5 and the first connecting piece 4 form a stable support, the stay bar 2 forms a support for the upper connecting rod 1. In some embodiments, the supporting action of the stay 2 can also act on other components through the central rod 3.

In some embodiments, the folding cart 100 may further include a locking device, which may be used to lock the stable connection formed by the composite hinge 5 and the first connecting member 4 after sliding upward along the central rod 3, so as to prevent relative shaking or movement between the first connecting member 4 and the composite hinge 5.

In some embodiments, the locking device may be a locking member, the locking member includes a locking groove and a locking block, the locking groove and the locking block may be respectively disposed on the first connecting member 4 and the composite hinge 5, the composite hinge 5 is close to the first connecting member 4 along the central rod 3, and the locking groove is engaged with the locking block to lock and stabilize the stable connection between the first connecting member 4 and the composite hinge 5. In some embodiments, the locking device may be a bolt member. In some embodiments, the locking device may be as described with reference to fig. 3. The locking device can also take other various forms.

FIG. 2 is a partial schematic view of a folding cart according to some embodiments of the present disclosure.

As shown in fig. 2, the lower surface of the first connecting member 4 includes a convex arc surface 41, in some embodiments, the first connecting member 4 is a coupling, the upper connecting rod 1 is movably connected through the coupling, and the convex arc surface 41 is an arc surface on the coupling. In some embodiments, the upper surface of the compound hinge 5 includes a concave arc surface 51, and the convex arc surface 41 at least partially conforms to the concave arc surface 51. The composite hinge 5 is close to the first connecting piece 4 along the central rod 3, the convex arc surface 41 is limited by the concave arc surface 51, and the stable connection of the first connecting piece 4 and the composite hinge 5 can be realized. The convex curved surfaces are not limited in number. In some embodiments, the convex arc surface 41 and the concave arc surface 51 cooperate to limit the relative displacement of the first link 4 and the compound hinge 5 in the front-rear direction of the foldable vehicle 100, and to limit the relative displacement of the first link 4 and the compound hinge 5 in the vertical direction. In some embodiments, the convex arc surface 41 and the concave arc surface 51 cooperate to limit the relative displacement of the first connecting member 4 and the composite hinge 5 in the vertical direction, and the composite hinge 5 is sleeved on the central rod 3 through a central hole or a sleeve, that is, the central rod 3 passes through the central hole of the composite hinge 5, and the displacement of the composite hinge 5 in the front-back direction of the foldable vehicle 100 is limited through the cooperation of the central hole and the sleeve with the central rod 3.

In some embodiments, one of the convex arc surfaces 41 may be a convex arc surface, the concave arc surface 51 may be a concave arc surface, the convex arc surface and the concave arc surface are matched with each other, and when the first connecting member 4 is stably connected to the composite hinge 5, the convex arc surface 41 abuts against the concave arc surface 51, so that the abutment between the first connecting member 4 and the composite hinge 5 can be kept stable.

In some embodiments, one of the convex curved surfaces 41 may be any surface that is convex. For example, one convex arc surface 41 may be a convex continuous arc surface, a polygonal surface, or the like, and the concave arc surface 51 coincides with the convex arc surface 41.

In some embodiments, the male structure may comprise at least one post structure (e.g., a prism or a cylinder, etc.), the female structure may comprise at least one slot structure cooperating with the post structure, and the post structure abuts against the slot structure when the first connecting member 4 is stably connected to the composite hinge 5. The column structure is abutted with the groove structure, and can be a column structure corresponding to one groove structure or a plurality of column structures corresponding to one groove structure.

FIG. 3 is a schematic illustration of a folding cart in a semi-folded configuration according to some embodiments of the present disclosure; FIG. 4 is a schematic illustration of a folding cart in a fully folded configuration according to some embodiments of the present disclosure.

As shown in fig. 2-4, in some embodiments, the first and second distances become smaller as the center bar 3 slides upward relative to the compound hinge 5.

The first distance is the distance between the upper connecting rod 1 and the support rod 2. The distance represents the proximity of the two and may be, for example, the minimum of the distances between each of the two points. The distance may also be represented in other ways.

The second distance is the distance between the upright frame connecting rod 6 and the central rod 3, and the measurement mode is the same as the first distance.

In some embodiments, as shown in fig. 2, the compound hinge 5 forms a stable connection with the first connector 4 when the folding cart 100 is in the unfolded state. As shown in fig. 3, when the central rod 3 slides upward relative to the compound hinge 5 to change the foldable cart 100 into a folded state, the first distance between the upper connecting rod 1 and the stay rod 2 is reduced, and the second distance between the upright frame connecting rod 6 and the central rod 3 is also reduced, so that the peripheral size of the foldable cart 100 can be reduced, the occupied space is reduced, and the foldable cart is convenient to store.

In some embodiments, the first end 110 of the upper connecting rod 1 may be provided with a connecting piece 131, and the upper connecting rod 1 is movably connected with the stile connecting rod 6 through the connecting piece 131. In some embodiments, the connecting piece 131 is configured as a flat arc to prevent the first end 110 of the upper link 1 from interfering with the movement of the stile link 6 during rotation.

FIG. 5 is a schematic view of an upper link shown in accordance with some embodiments of the present description.

As shown in fig. 5A, the upper link 1 may further include or support a first carrier unit 9.

The first carrier unit 9 may be a component for placing an article. The first carrier unit 9 may have various types of structures, such as a frame, a box, a plate, etc.

In some embodiments, the first carrier unit 9 may be foldable or detachable. For example, when the folding cart is folded, the first carrier unit 9 can be folded together with the folding cart 100; or the first carrier unit 9 is detached and only the folding cart 100 is folded individually.

In some embodiments, the upper link 1 may directly serve as the first carrier unit 9. For example, the object can be carried by placing the object on the upper link 1 in various forms such as hanging or placing, and the first carrier unit 9 is the upper link 1 itself.

In some embodiments, the first carrier unit 9 may be a component that is directly or indirectly supported by the upper link 1, and the upper link 1 supports the first carrier unit 9. For example, the first carrier unit 9 may be hung on the upper link 1. For example, the upper link 1 may be fixed or movably connected to other components to carry the first carrier unit 9. As shown in fig. 5B, two container bottoms 10 are disposed above the upper connecting rods 1, and the container bottoms 10 are connected to the upper connecting rods of the two sets of folding frame assemblies to form an upper bottom frame type folding vehicle. In some embodiments, the two ends of the bottom 10 of the cargo frame are movably connected with the upright frame connecting rods 6, and the central positions of the two sides of the bottom 10 of the cargo frame are movably connected with the support rods 2 and the central rod 3. When an article is placed in/on the first carrier unit 9, the upper link 1 supports the first carrier unit 9 through the stay bar 2 and the central rod 3, and at this time, the upper link 1 indirectly supports the first carrier unit 9.

The bottom 10 of the cargo box may be a part for placing the first carrier unit 9. The structure is not limited, and the structure may be a thin plate or other structures such as a rail.

The cargo box bottom 10 may be integral or may be formed from a combination of parts. In some embodiments, the container bottom 10 may include a front container bottom 101 and a rear container bottom 102, and the front container bottom 101 and the rear container bottom 102 may be identical or different in structure. One end of the front goods frame bottom 101 and one end of the rear goods frame bottom 102 are movably connected with the upright frame connecting rod 6, and the other corresponding ends are movably connected with each other and movably connected with the stay bar 2 and the central rod 3.

By means of some embodiments related to the first carrier unit 9, a device with a higher carrying position can be formed, which is suitable for more application scenarios. Some structures associated with this may be referred to as upper bottom frame type structures.

Fig. 6 is a schematic view of a first carrier unit according to some embodiments of the present disclosure.

As shown in fig. 6A, the first carrier unit 9 has a removable fence 91. In some embodiments, the foldable wagon may include one to four foldable or detachable pens, for example, the upper base frame type foldable wagon may include one to four foldable or detachable pens. Wherein, the removable can be foldable or detachable.

The enclosure 91 may be a side elevation of an element enclosed by a combination of several planes. In some embodiments, the pens can include one or more of front pen 911, back pen 912, left pen 913, right pen 914. The rail may also be other ways, such as a part of an arc.

The number of the fences that the first carrier unit 9 can include may be arbitrary, and the number of the removable fences 91 may also be arbitrary.

The fence 91 may be of various forms such as planar, net or other forms.

The number of removals may be one or more, in different uses. In some embodiments, the foldable wagon 100 can be a mobile seat if one of the rails 91 of the left rail 913 or the right rail 914 of the first carrier unit 9 is removed, see fig. 6B.

In some embodiments, the three rails 91, the left rail 913, the right rail 914 and the rear rail 912 of the first carrier unit 9 and/or the rear armrest rail 112 of the armrest rail 11 can be removed, and the foldable wagon 100 can be a mobile lounge chair or an open platform, as shown in fig. 6C.

The handrail 11 may be a member for providing a user to hold or push. In some embodiments, the arm rest rails 11 may include a front arm rest rail 111 and a rear arm rest rail 112. The front handrail fence 111 is sleeved in the front end upright frame connecting rod 6 of the folding vehicle 100 and can be detached; the rear handrail fence 112 is sleeved in the rear end upright frame connecting rod 6 of the folding bicycle 100 and can be detached similarly.

In some embodiments, the four rails 91 and/or the front handrail 111 and the rear handrail 112 of the first carrier unit 9 can be removed, so that the foldable cart 100 can be a flat-surface foldable cart or a movable dining cart, see fig. 6D.

The handrail in some of the above embodiments is optional, and the foldable vehicle may not include part or all of the handrail.

Some embodiments of the present disclosure adopt a method of removing the rail of the first carrier unit and the handrail of the foldable vehicle to change the shape of the foldable vehicle, so as to expand the functions and applications of the device.

FIG. 7 is a schematic view of a folding cart according to some embodiments of the present disclosure.

As shown in fig. 7, the foldable wagon 100 includes a universal wheel assembly that is movably coupled to a stile linkage. In some embodiments, the universal wheel assembly includes a handle 161, a handle bar 162, a handle bar sleeve 163, a universal wheel frame 164, a bogie 165, a universal wheel shaft 166, an axial positioning element, and an axial limiting element, which are all movably connected to each other.

In some embodiments, the pull handle 161 is disposed at the top end of the pull handle bar 162, and the pull handle 161 may be ring-shaped for the user to hold. In some embodiments, the bottom end of the handle bar 162 is provided with a handle bar sleeve 163, the handle bar sleeve 163 is provided on the bogie 165, and the direction of the foldable bicycle 100 can be changed by controlling the handle bar 162 to be rotatable relative to the handle bar sleeve 163.

In some embodiments, the bogie 165 is provided with a universal wheel frame 164 on both sides, the universal wheel frame 164 is provided with a universal wheel shaft 166, and the universal wheels 121 of the foldable vehicle 100 are rotatably provided on the universal wheel shaft 166. In some embodiments, an axial positioning element and an axial limiting element are coupled to the universal wheel 121 for axially positioning or limiting the universal wheel 121.

In some embodiments, the folding cart 100 may include, but is not limited to, various types of wheels 12, and the wheels 12 may be elements for rolling, making the folding cart 100 movable. The wheels 12 may be of various numbers and forms. In some embodiments, the wheels 12 may include a universal wheel 121 and a fixed wheel 122. Wherein, the universal wheel 121 is arranged at the front end of the folding trolley 100 and is positioned in the middle of the device, and the fixed wheel 122 is arranged at the rear end of the folding trolley 100 and is positioned at two sides of the device; the universal wheel 121 is movably connected with the universal wheel frame 164, and the fixed wheel 122 is movably connected with the fixed wheel component 15.

The castor 121 can be rotated through 360 deg. for adjusting the direction of movement of the device. In some embodiments, the universal wheels 121 may be one or more.

The fixed wheel 122 may be used to assist in device movement. Likewise, in some embodiments, the fixed wheel 122 may be one or more.

In some embodiments, the universal wheels 121 are located at an intermediate position of the fixed wheels 122 when the foldable wagon 100 is in the folded state, to save storage space of the device.

The universal wheel frame 164 is used for connecting and fixing the universal wheel 121 and driving the universal wheel 121 to steer. The fixed wheel assembly 15 is used to connect the fixed wheel 122. The universal wheel frame 164 and the fixed wheel component 15 are both fixedly connected with the vertical frame connecting rod 6 of the folding bicycle 100.

In some embodiments, the folding cart 100 further comprises a travel limiting device 13, and the travel limiting device 13 may be used to brake the folding cart 100. The restriction device 13 may be arranged in various ways. Such as providing a brake pedal at the wheel 12 or a brake lever at the rear end of the folding cart 100. In some embodiments, the folding cart 100 may be braked using the handle 16. For example, when the handle 16 is rotated into contact with the ground, braking of the folding cart 100 may be achieved; or the brake is controlled by the handle 16 to realize braking. The handle 16 may be a component for a hand pulling or pushing device, and the handle 16 is movably connected to the universal wheel frame 164. The restriction device 13 may also be implemented in other ways.

FIG. 8 is a schematic diagram of a folding cart according to some embodiments of the present disclosure.

As shown in fig. 8, the folding cart 100 further comprises a lower link 7 for load bearing, the lower link 7 being directly or indirectly movably connected with the central bar 3. In some embodiments, the angle of the lower link 7 relative to the stile link 6 changes during folding of the folding cart 100.

In some embodiments, the lower link 7 is similarly weighted to the upper link 1. In some embodiments, the lower links 7 may be solely load bearing. In some embodiments, the lower link 7 may be load bearing in cooperation with the upper link 1. The lower link 7 may also be load bearing in other ways.

In some embodiments, the lower link 7 may include, but is not limited to: rods, flat frames, space frames, plates or other members. In some embodiments, the lower link 7 may comprise a plurality of bars, which are used together for load bearing.

In some embodiments, first end 71 of lower link 7 may be movably connected to stile link 6. If the lower link 7 is a rod, the first end 71 of the lower link 7 may be any one of the two ends in the axial direction; if the lower link 7 is a planar frame or plate, the first end 71 of the lower link 7 may be any side thereof; if the upper link 1 is a three-dimensional frame, the first end 71 of the lower link 7 may be any side surface thereof. The first end 71 of the lower link 7 is movably connected to the upright link 6 in a similar manner as the first end 110 of the upper link 1 is movably connected to the upright link 6, for example, the first end 71 of the lower link 7 is hinged, flexibly connected or detachably connected to the upright link 6, so that the relative angle between the lower link 7 and the upright link 6 can be adjusted, and the folding purpose of the folding cart 100 is achieved.

In some embodiments, the second end 72 of the lower link 7 may be directly movably connected with the central rod 3. For example, the second end 72 of the lower link 7 may be hingedly, flexibly or removably connected to the central rod 3. In some embodiments, the second end 72 of the lower link 7 may be indirectly movably connected with the central rod 3 by the third connecting member 8. In some embodiments, the third link 8 may be rigidly or movably connected to the central rod 3, and the second end 72 of the lower link 7 may be movably connected to the third link 8. For example, the third link 8 is a pivot shaft, which is fixed to the center rod 3, and the second end 72 of the lower link 7 is rotatably connected to the pivot shaft. Wherein the second end 72 of the lower link 7 may be an end, a side or a side thereof according to the structure of the lower link 7, similar to the first end 71 of the lower link 7. The structure formed by the stay bar 2, the upper connecting rod 1 and the upright frame connecting rod 6 can form the support for the lower connecting rod 7 through the central rod 3.

In some embodiments, the second ends 72 of the two lower links 7 may be movably connected with the central bar 3 at the same time. In some embodiments, the second ends of the two lower links 7 may be movably connected to the third link 8 at the same time. In some embodiments, the lower link 7 comprises a plurality of rods that are simultaneously movably connected to the third link 8.

FIG. 9 is a schematic view of a lower link according to some embodiments of the present description.

As shown in fig. 9, the lower link 7 may further include or support a second carrier unit 17.

The second carrier unit 17 may refer to a different component than the first carrier unit 9, but may equally be used for placing objects. The form of the second carrier unit 17 can be referred to the description of the first carrier unit 9, but other forms are also possible. The second carrier unit 17 may be the same as or different from the first carrier unit 9.

The way in which the lower link 7 comprises or supports the second carrier unit 17 can be referred to the description of the upper link 1, but other forms are also possible.

In some embodiments, the lower link 7, the stay bar 2, the central bar 3, the upright link 6, and the like, enclose a storage space, and an article can be directly placed on the lower link 7, in which case the lower link 7 corresponds to the second loading unit 17 for loading the article.

In some embodiments, the lower link 7, the brace 2, the central rod 3, the upright link 6, and the like, form a storage space, and the second carrier unit 17 can be disposed above the lower link 7 and in the storage space, where the second carrier unit 17 is used for placing articles and limiting the movement of the articles, and the lower link 7 is in direct contact with the second carrier unit 17 for supporting the second carrier unit 17.

By means of some embodiments related to the second carrier unit 17, a device with a larger carrying space can be formed. Some structures associated with this may be referred to as lower chassis type structures. In some embodiments, as shown in fig. 8, two cargo box bottoms 10 are disposed above the lower links 7, and the cargo box bottoms 10 connect the lower links 7 of the two folding frame assemblies to form a lower-frame-type folding cart. In some embodiments, the two ends of the bottom 10 of the cargo frame are movably connected with the upright frame connecting rods 6, and the central positions of the two sides of the bottom 10 of the cargo frame are movably connected with the support rods 2 and the central rod 3. When an article is placed in/on the second carrier unit 17, the lower link 7 supports the second carrier unit 17 through the stay bar 2 and the central rod 3, and the lower link 7 indirectly supports the second carrier unit 17.

The container bottom 10 may be a part for placing the second carrier unit 17. The structure is not limited, and the structure may be a thin plate or other structures such as a rail.

In some embodiments, the upper link 1 of the lower-bottom-frame-type foldable vehicle can be used as a skeleton or a flat plate to be used as a table or a stool. In some embodiments, the folding cart 100 further includes a hanger for mounting seats within the cart. In some embodiments, the hanging device can be a component such as a flat plate or a strap that is hung or directly mounted on the upper link 1, and can be used directly as a seat in a vehicle, or used for supporting or mounting a seat.

In some embodiments, the first cross-sectional dimension of the center rod 3 is smaller than the second cross-sectional dimension. The first cross-sectional dimension refers to a cross-sectional dimension of the first location and the second cross-sectional dimension refers to a cross-sectional dimension of the second location, the first location being below the second location.

The cross-sectional size here may be various indexes reflecting the cross-sectional size. For example, the cross-sectional dimension may be the diameter, radius of a circular rod, side length of a polygonal rod, circumference of a rod, and the like. The first cross-sectional dimension is the same as the second cross-sectional dimension as specified.

The first position is located below the second position. This direction is determined by the orientation of the central bar 3 when the folding cart is in use.

In some embodiments, the compound hinge 5 includes a resistance device such that the compound hinge has resistance to sliding from the first position to the second position.

In some embodiments, the central rod 3 may pass through a hole belonging to the compound hinge 5, and the resistance means may be elastic means arranged inside the hole of the compound hinge 5. For example, the elastic means may include, but is not limited to, a spring, an elastic rubber, or the like having a "compression-rebound" characteristic. The holes may be peripherally closed or may be unsealed with a notch. The holes may be of various shapes, such as circular, polygonal, etc.

By means of some embodiments described above, the folding cart 100 can be made relatively stable in the folded-up state.

In some embodiments, the resistance device may be adjustable, and the resistance experienced by the foldable wagon 100 when deployed may vary with adjustment, and thus the speed of deployment may vary.

In some embodiments, the center rod is connected with or comprises one or more limiting devices for limiting the composite hinge from sliding from bottom to top. The stop means may be of various forms, such as detents or the like. Through stop device, can control the degree that folding car was folded up or was expanded.

In some embodiments, the first carrier unit 9 or the second carrier unit 17 may vary in length. The first carrier unit 9 or the second carrier unit 17 may be a telescopic or foldable rod, plate, box, net or frame, etc., or other mechanism or device that can change length. By changing the length of the first carrier unit 9 or the second carrier unit 17, the storage manner or the effective volume of the folding cart 100 can be changed. In conjunction with the previous embodiments, the foldable wagon 100 can be formed into carriers of different lengths with different degrees of openness of the foldable wagon.

Benefits that may be brought about by some embodiments of the present application include, but are not limited to: (1) the structure is simple, the number of movable parts is small, and the problems of strength reduction, large movable clearance, high noise and the like caused by excessive movable parts can be effectively avoided; (2) the folding vehicle has rich use scenes and wide application, and the structure of the folding vehicle can be changed according to different use scenes and applications; (3) when the foldable bicycle is folded and unfolded, due to the symmetry of the structure in the foldable bicycle, the foldable bicycle can be synchronously folded and unfolded from front to back, and the folded foldable bicycle is always kept in a standing state, so that the foldable bicycle is convenient to carry or operate by a user. It is to be noted that different embodiments may produce different advantages, and in different embodiments, the advantages that may be produced may be any one or combination of the above, or any other advantages that may be obtained.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be regarded as illustrative only and not as limiting the present specification. Various modifications, improvements and adaptations to the present description may occur to those skilled in the art, although not explicitly described herein. Such alterations, modifications, and improvements are intended to be suggested in this specification, and are intended to be within the spirit and scope of the exemplary embodiments of this specification.

Similarly, it should be noted that in the foregoing description of embodiments of the specification, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features than are expressly recited in a claim. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present disclosure. Other variations are also possible within the scope of the present description. Thus, by way of example, and not limitation, alternative configurations of the embodiments of the specification can be considered consistent with the teachings of the specification. Accordingly, the embodiments of the present description are not limited to only those embodiments explicitly described and depicted herein.

Claims (10)

1. A folding cart, comprising:

a folding frame assembly comprising the following components: the mechanism comprises at least two upper connecting rods, at least two lower connecting rods, two vertical frame connecting rods, a central rod, at least two support rods and a composite hinge, wherein the upper connecting rods and the lower connecting rods are equal in length, the vertical frame connecting rods and the central rod are equal in length, and the two support rods are equal in length to form two groups of same parallelogram mechanisms; the two support rods and the composite hinge form a support rod mechanism; the components are movably connected with each other.

2. The folding cart of claim 1 wherein said upper link or said lower link, when pulled, is constrained by said parallelogram mechanism and said strut mechanism such that simultaneous movement of the members effects a folding action of said folding cart.

3. The folding cart of claim 1 wherein upon pushing said upper link or said lower link, said upper link or said lower link is constrained by said parallelogram mechanism and said strut mechanism such that simultaneous movement of the members effects the unfolding action of said folding cart.

4. The folding cart of claim 1 wherein said compound hinge has a concave contour that engages a coupling of said upper link in an operational state; the center rod passes through the center hole of the compound hinge.

5. The folding cart of claim 1 comprising one or two sets of said folding frame assemblies arranged in parallel.

6. The foldable wagon of claim 5, further comprising two cargo box bottoms connecting the lower links of the two sets of folding frame assemblies to form a lower frame-type foldable wagon.

7. The folding cart of claim 5 further comprising hanger means for mounting seats in the cart.

8. The foldable wagon of claim 5, further comprising two cargo box bottoms connecting the upper links of the two sets of folding frame assemblies to form an upper sill-type foldable wagon.

9. The foldable wagon of claim 5, wherein the foldable wagon further comprises one to four foldable or detachable rails.

10. The folding cart of claim 1 further comprising a universal wheel assembly, said universal wheel assembly being movably coupled to one of said stile links; the universal wheel component comprises a handle, a handle rod sleeve, a universal wheel carrier, a bogie, a universal wheel shaft, an axial positioning piece and an axial limiting piece, and the components are movably connected with each other.

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