Folding assembly, storage device and cart

Abstract

The invention discloses a folding assembly, a storage device and a cart, the storage device comprises a front plate assembly, a rear plate assembly, two side plate assemblies and a bottom plate assembly, the side plate assembly comprises a first side plate, a second side plate and an adapter plate, one side of the first side plate and one side of the second side plate are rotatably mounted on two opposite sides of the adapter plate respectively, and the adapter plate is rotatably mounted on the rear plate assembly. The other side of the first side plate of one side plate assembly is rotatably installed on one side of the rear plate assembly, the other side of the second side plate is rotatably installed on one side of the front plate assembly, and the other side of the first side plate of the other side plate assembly is rotatably installed on the other side of the rear plate assembly. The other side of the second side plate is rotatably installed on the other side of the front plate assembly, the bottom plate assembly is connected to the bottom of the bottom plate assembly, the bottom of the rear plate assembly and the bottoms of the side plate assemblies, and therefore a containing cavity is formed among the front plate assembly, the rear plate assembly, the side plate assemblies and the bottom plate assembly.

Description

Technical Field

[0001] This invention relates to the field of storage box technology, and in particular to a folding assembly, storage device and trolley. Background Technology

[0002] In Chinese invention patent application CN119796299A, the inventor disclosed a foldable storage device comprising a front panel unit, a rear panel unit, two side panel units, and two bottom panel units. The rear panel unit and the front panel unit are arranged face-to-face. The middle of the side panel units can be folded inward. The opposite sides of one side panel unit are rotatably mounted to one side of the front panel unit and one side of the rear panel unit, respectively. The opposite sides of the other side panel unit are rotatably mounted to the other side of the front panel unit and the other side of the rear panel unit, respectively. The opposite ends of the bottom panel units can be folded upward. The opposite ends of one bottom panel unit are rotatably mounted to one end of the two side panel units at the bottom of the side panel units, respectively. The opposite ends of the other bottom panel unit are rotatably mounted to the other end of the two side panel units at the bottom of the side panel units, respectively. The folding axis of the bottom panel unit and the rotation axis of the bottom panel unit and the side panel unit form an acute angle. In the prior art, each of the side panel units includes a first side panel and a second side panel. One side of the first side panel and one side of the second side panel are axially connected, thereby making the middle of the side panel unit foldable. The side of the first side panel of one side panel unit facing away from the second side panel is axially connected to one side of the front panel unit, and the side of the second side panel of this side panel unit facing away from the first side panel is axially connected to one side of the rear panel unit. The side of the first side panel of another side panel unit facing away from the second side panel is axially connected to the other side of the front panel unit, and the side of the second side panel of this side panel unit facing away from the first side panel is axially connected to the other side of the rear panel unit. The rear panel assembly includes a unlocking plate. The four edges of the unlocking plate can be supported by the top of the front panel unit, the tops of the two side panel units, and the top of the baffle, respectively, so that the unlocking plate can form a cover to cover the opening of the storage cavity of the storage device. In the existing storage device, firstly, since one side of the first side plate and one side of the second side plate of the side plate unit are directly shaft connected, a protrusion inevitably forms at the connection between the first side plate and the second side plate. This protrusion not only affects the aesthetics of the storage device, but also prevents the side plate unit from adhering tightly to the wall when the storage device needs to be placed against it, or prevents the side plate units of the two storage devices from adhering tightly when they need to be placed side by side. Because a protrusion forms at the connection between the first side plate and the second side plate, it is impossible to print on the surface of the side plate assembly as a whole. Secondly, the unlocking plate is placed directly on the top of the front plate unit, the top of the two side plate units, and the top of the baffle. This means that the unlocking plate can be easily opened, and cannot effectively protect the items stored in the storage cavity. Summary of the Invention

[0003] One object of the present invention is to provide a folding assembly, a storage device and a trolley, wherein, when the folding assembly is in an unfolded state, the outer sides of the first plate and the outer sides of the second plate of the folding assembly are flush, thereby making the outer side of the folding assembly flat.

[0004] One object of the present invention is to provide a folding assembly, a storage device and a trolley, wherein when the folding assembly is in an unfolded state, the inner sides of the first plate and the inner sides of the second plate are flush, thereby making the inner side of the folding assembly flat.

[0005] One object of the present invention is to provide a folding assembly, a storage device and a trolley, wherein when the folding assembly is in a folded state, the outer sides of the first plate and the outer sides of the second plate can be integrally fitted together to reduce the space occupied by the folding assembly.

[0006] One object of the present invention is to provide a folding assembly, a storage device, and a trolley, wherein the first plate and the second plate are connected by an assembly shaft with a cross-sectional shape of an arcuate arch, and the folding assembly can switch between an unfolded state and a folded state by allowing the first plate and the second plate to rotate about the center of the assembly shaft.

[0007] One object of the present invention is to provide a folding assembly, a storage device, and a trolley, wherein the folding assembly is used to form a side panel assembly in the stored state, such that when the storage device is unfolded, the outer side of the side panel assembly is flat and has no protrusions.

[0008] One object of the present invention is to provide a folding assembly, a storage device, and a trolley, wherein one side of the first side plate and one side of the second side plate of the side plate assembly are rotatably mounted on opposite sides of a connecting plate, and when the storage device is unfolded, the outer sides of the first side plate, the outer sides of the connecting plate, and the outer sides of the second side plate are flush, thereby making the outer side of the side plate assembly flat and without protrusions.

[0009] One object of the present invention is to provide a folding assembly, a storage device, and a trolley, wherein when the cover of the storage device closes the opening of the storage cavity, the free side of the cover can be locked onto the top of the front panel assembly, thereby the storage device can effectively protect the items stored in the storage cavity.

[0010] One object of the present invention is to provide a folding assembly, a storage device, and a trolley, wherein the pivot side of the cover has an elastic arm that, when the free side of the cover is locked on top of the front panel assembly, is blocked by the top edge of the cavity of the rear panel assembly and is in a deformed state; after the free side of the cover is released from the top of the front panel assembly, the elastic arm tilts the free side of the cover upwards during the process of returning to its initial state, so as to form a gap between the top of the front panel assembly and the free side of the cover, so as to facilitate the user to apply force to the top cover to open the opening of the storage cavity.

[0011] According to one aspect of the present invention, a storage device is provided, comprising: One front panel assembly; A rear panel assembly, wherein the rear panel assembly and the front panel assembly are arranged face to face; Two side panel assemblies, each of the side panel assemblies including a first side panel, a second side panel, and a transition plate, wherein one side of the first side panel and one side of the second side panel are rotatably mounted on opposite sides of the transition plate, wherein in one side panel assembly, the side of the first side panel facing away from the transition plate is rotatably mounted to one side of the rear panel assembly, and the side of the second side panel facing away from the transition plate is rotatably mounted to one side of the front panel assembly; in another side panel assembly, the side of the first side panel facing away from the transition plate is rotatably mounted to the other side of the rear panel assembly, and the side of the second side panel facing away from the transition plate is rotatably mounted to the other side of the front panel assembly; and A base plate assembly, wherein, after the storage device is unfolded, the four edges of the base plate assembly are respectively connected to the bottom of the front plate assembly, the bottom of the rear plate assembly and the bottom of each of the side plate assemblies, thereby forming a storage cavity between the front plate assembly, the rear plate assembly, each of the side plate assemblies and the base plate assembly.

[0012] According to one embodiment of the present invention, the base plate assembly includes two base plate units, each of which has opposite ends that are foldable upwards. One of the base plate units has opposite ends that are rotatably connected to the bottom of the first side plate of the two side plate assemblies. The folding axis of this base plate unit and the rotation axis of this base plate unit with the first side plate have an acute angle. The other base plate unit has opposite ends that are rotatably connected to the bottom of the second side plate of the two side plate assemblies. The folding axis of this base plate unit and the rotation axis of this base plate unit with the second side plate have an acute angle.

[0013] According to one embodiment of the present invention, the base plate unit includes a triangular base plate main plate and two triangular base plate sub-plates. The base plate main plate has a first main plate short side, a second main plate short side, and a main plate long side. The base plate sub-plates have a first sub-plate short side, a second sub-plate short side, and a second sub-plate long side. The sub-plate long side of one base plate sub-plate and the first main plate short side of the base plate main plate are axially connected to form a folding axis of the base plate unit. The sub-plate long side of the other base plate sub-plate and the second main plate short side of the base plate main plate are axially connected to form another folding axis of the base plate unit. The first sub-plate short sides of the two base plate sub-plates of one base plate unit and the bottom of the first side plate of the two side plate assemblies are axially connected to form a rotation axis between the base plate unit and the first side plate. The first sub-plate short sides of the two base plate sub-plates of the other base plate unit and the bottom of the second side plate of the two side plate assemblies are axially connected to form a rotation axis between the base plate unit and the second side plate.

[0014] According to one embodiment of the present invention, the adapter plate has a first groove and a second groove on opposite sides, the adapter plate has at least a pair of first pivot arms in the first groove and at least a pair of second pivot arms in the second groove, a first pivot cavity is formed between the pair of first pivot arms, and each pair of first pivot arms has a first mounting hole communicating with the first pivot cavity, a second pivot cavity is formed between the pair of second pivot arms, and each pair of second pivot arms has a second mounting hole communicating with the second pivot cavity, wherein the first side plate has a first protruding arm and at least one first pivot shaft disposed on the first protruding arm, the first side plate having ... A protruding arm protrudes into the first groove of the adapter plate, the first pivot shaft is located in the first pivot cavity and the opposite ends of the first pivot shaft extend into the first mounting holes of a pair of first pivot arms, so that the first side plate is rotatably mounted on the adapter plate, wherein the second side plate has a second protruding arm and at least one second pivot shaft disposed in the second protruding arm, the second protruding arm of the second side plate protrudes into the second groove of the adapter plate, the second transmission shaft is located in the second pivot cavity and the opposite ends of the second pivot shaft extend into the second mounting holes of a pair of second pivot arms, so that the second side plate is rotatably mounted on the adapter plate.

[0015] According to one embodiment of the present invention, the adapter plate is provided with at least one first rib in the first groove and at least one second rib in the second groove. The first side plate has at least one first abutment arm disposed on the first rib. The second side plate has at least one second abutment arm disposed on the second rib. After the side plate assembly is unfolded, the first abutment arm of the first side plate abuts against the first rib of the adapter plate, and the second abutment arm of the second side plate abuts against the second rib of the adapter plate.

[0016] According to one embodiment of the present invention, the first abutment arm of the first side plate is disposed in the space between the two first pivot shafts, and the second abutment arm of the second side plate is disposed in the space between the two second pivot shafts.

[0017] According to one embodiment of the present invention, the rear panel assembly has a cavity, the storage device has a cover plate having a pivot side and a free side relative to the pivot side, the pivot side of the cover plate being slidably mounted to the rear panel assembly, the cover plate being received in the cavity of the rear panel assembly when the pivot side of the cover plate slides to the bottom of the cavity of the rear panel assembly, and the cover plate being flipped to close the opening of the storage cavity when the pivot side of the cover plate slides to the top of the cavity of the rear panel assembly.

[0018] According to one embodiment of the present invention, the storage device includes a locking assembly disposed on the top of the front panel assembly. The cover plate has at least one elastic arm on the pivot side. When the cover plate closes the opening of the storage cavity, the locking assembly locks the free side of the cover plate. The upper part of the end of the elastic arm is blocked by the top edge of the cavity of the rear panel assembly, and the elastic arm is in a deformed state. After the locking assembly releases the free side of the cover plate, the elastic arm causes the free side of the cover plate to tilt upwards during the process of returning to its initial state.

[0019] According to one embodiment of the present invention, the top of the front panel assembly has a mounting groove with an outer opening and a locking hook hole extending from the mounting groove to the inner side of the front panel assembly. The lock assembly includes a lock body and a compression spring. The lock body includes a lock block and a locking hook integrally extending from the lock block. The lock block is pressably mounted in the mounting groove of the front panel assembly. The locking hook extends through the locking hook hole to the inner side of the front panel assembly. The opposite ends of the compression spring abut against the lock block and the front panel assembly, respectively. A hook is provided on the free side of the cover plate. When the cover plate closes the opening of the storage cavity, the locking hook of the lock body hooks the hook of the cover plate to keep the cover plate in the position of closing the opening of the storage cavity.

[0020] According to one embodiment of the present invention, the cover plate has a plurality of elastic arms, which are spaced apart from each other on the pivot side along the width direction of the cover plate.

[0021] According to one embodiment of the present invention, the storage device includes a locking assembly disposed on the free side of the cover plate. The cover plate is provided with at least one elastic arm on the pivot side. When the cover plate closes the opening of the storage cavity, the locking assembly locks the top of the front panel assembly. The upper part of the end of the elastic arm is blocked by the top edge of the cavity of the rear panel assembly, and the elastic arm is in a deformed state. After the locking assembly releases the top of the front panel assembly, the elastic arm causes the free side of the cover plate to tilt upwards during the process of returning to its initial state.

[0022] According to one embodiment of the present invention, the free side of the cover plate has a mounting groove and a locking hook hole communicating with the mounting groove. The lock assembly includes a lock body and a compression spring. The lock body includes a slider and a locking protrusion integrally extending from the slider. The slider is slidably mounted in the mounting groove of the cover plate. The locking protrusion extends through the locking hook hole to a position protruding from the free side of the cover plate. The opposite ends of the compression spring abut against the lock block and the cover plate, respectively. The front plate assembly has a locking groove. When the cover plate closes the opening of the receiving cavity, the locking protrusion of the lock body extends into the locking groove of the front plate assembly. When the locking protrusion of the lock body exits the locking groove of the front plate assembly, the lock assembly releases the top of the front plate assembly.

[0023] According to one embodiment of the present invention, the slider has a lever groove, and the locking assembly further includes a locking plate. The middle portions of opposite sides of the locking plate are rotatably mounted to the inner wall of the cover plate for forming the mounting groove. A lever is provided at one end of the locking plate near the free side of the cover plate. The lever extends into the lever groove of the slider and abuts against the inner wall of the slider for forming the lever groove. When the locking plate rotates relative to the cover plate, the lever of the locking plate drives the slider to slide relative to the cover plate.

[0024] According to one embodiment of the present invention, the lock assembly further includes a bottom cover, which is mounted on the cover plate to close the bottom opening of the mounting groove of the cover plate to form the bottom of the mounting groove.

[0025] According to one embodiment of the present invention, the cover plate is provided with at least one slot at one end of the mounting groove and at least one hook groove at the other end, the bottom cover is provided with at least one locking arm at one end and at least one hook arm at the other end, the locking arm of the bottom cover engages with the slot of the cover plate, and the hook arm of the bottom cover passes through the hook groove of the cover plate and hooks the cover plate.

[0026] According to one embodiment of the present invention, the top of the adapter plate has a groove, the top of one side of the first side plate has a first protrusion, the first protrusion has a first recessed groove and a first hook extending upward from the first recessed groove, the top of one side of the second side plate has a second protrusion, the second protrusion has a second recessed groove and a second hook extending upward from the second recessed groove, the side plate assembly further includes a side plate lock, the outer side of the side plate lock has a slider, the inner side has an upper hook and a lower hook, the slider of the side plate lock is slidably mounted on the groove of the adapter plate, and after the storage device is unfolded, the upper hook of the side plate lock protrudes into the groove. The first protrusion of the first side plate has a first recessed groove, and the lower hook block protrudes into the second recessed groove of the second protrusion of the second side plate. Pulling the side plate lock upward causes the upper hook block to hook into the first hook slot of the first protrusion of the first side plate, and the lower hook block to hook into the second hook slot of the second protrusion of the second side plate, so that the side plate lock locks the first side plate, the second side plate, and the adapter plate. Pressing the side plate lock downward causes the upper hook block to exit the first hook slot of the first protrusion of the first side plate, and the lower hook block to exit the second hook slot of the second protrusion of the second side plate, so that the side plate lock releases the first side plate and the second side plate.

[0027] According to another aspect of the invention, the invention further provides a storage device comprising: One base plate assembly; A front panel assembly; a rear panel assembly, wherein the rear panel assembly and the front panel assembly are arranged face to face, and the rear panel assembly has a panel cavity; Two side panel assemblies, wherein opposite sides of one side panel assembly are respectively connected to one side of the front panel assembly and one side of the rear panel assembly, and opposite sides of the other side panel assembly are respectively connected to the other side of the front panel assembly and the other side of the rear panel assembly, wherein the four edges of the bottom panel assembly are respectively connected to the bottom of the bottom panel assembly, the bottom of the rear panel assembly, and the bottom of each of the side panel assemblies, thereby forming a storage cavity between the front panel assembly, the rear panel assembly, each of the side panel assemblies, and the bottom panel assembly; and A cover plate having a pivot side and a free side relative to the pivot side, the cover plate having at least one resilient arm on the pivot side, the pivot side of the cover plate being slidably mounted to a rear panel assembly, the cover plate being received in the rear panel assembly cavity when the pivot side of the cover plate slides to the bottom of the cavity of the rear panel assembly, the cover plate being flipped over and the free side of the cover plate being locked to the top of a front panel assembly when the pivot side of the cover plate slides to the top of the cavity of the rear panel assembly, the resilient arm being in a deformed state and the free side of the cover plate being tilted upwards during the process of returning to the initial state after the locking assembly releases the free side of the cover plate.

[0028] According to one embodiment of the present invention, the storage device includes a locking assembly disposed on the top of the front panel assembly, the locking assembly being capable of locking or releasing the free side of the cover.

[0029] According to one embodiment of the present invention, the storage device includes a locking assembly disposed on the free side of the cover plate, the locking assembly being capable of locking or releasing the top of the front panel assembly.

[0030] According to another aspect of the invention, the invention further provides a trolley, the trolley including a pull rod, a set of wheels and a storage device, wherein the storage device includes: One front panel assembly; A rear panel assembly, wherein the rear panel assembly and the front panel assembly are arranged face to face; Two side panel assemblies, each of the side panel assemblies including a first side panel, a second side panel, and a transition plate, wherein one side of the first side panel and one side of the second side panel are rotatably mounted on opposite sides of the transition plate, wherein in one side panel assembly, the side of the first side panel facing away from the transition plate is rotatably mounted to one side of the rear panel assembly, and the side of the second side panel facing away from the transition plate is rotatably mounted to one side of the front panel assembly; in another side panel assembly, the side of the first side panel facing away from the transition plate is rotatably mounted to the other side of the rear panel assembly, and the side of the second side panel facing away from the transition plate is rotatably mounted to the other side of the front panel assembly; and A base plate assembly, wherein, after the storage device is unfolded, the four edges of the base plate assembly are respectively connected to the bottom of the front plate assembly, the bottom of the rear plate assembly, and the bottom of each of the side plate assemblies, thereby forming a storage cavity between the front plate assembly, the rear plate assembly, each of the side plate assemblies, and the base plate assembly, wherein the pull rod is installed on the rear plate assembly, and a wheel is respectively installed on two pairs of sides of the bottom of the front plate assembly and on opposite sides of the bottom of the rear plate assembly.

[0031] According to another aspect of the invention, the invention further provides a trolley, the trolley including a pull rod, a set of wheels and a storage device, wherein the storage device includes: One base plate assembly; A front panel assembly; a rear panel assembly, wherein the rear panel assembly and the front panel assembly are arranged face to face, and the rear panel assembly has a panel cavity; Two side panel assemblies, wherein opposite sides of one side panel assembly are respectively connected to one side of the front panel assembly and one side of the rear panel assembly, and opposite sides of the other side panel assembly are respectively connected to the other side of the front panel assembly and the other side of the rear panel assembly, wherein the four edges of the bottom panel assembly are respectively connected to the bottom of the bottom panel assembly, the bottom of the rear panel assembly, and the bottom of each of the side panel assemblies, thereby forming a storage cavity between the front panel assembly, the rear panel assembly, each of the side panel assemblies, and the bottom panel assembly; and A cover plate having a pivot side and a free side relative to the pivot side, the cover plate having at least one resilient arm on the pivot side, the pivot side of the cover plate being slidably mounted to a rear panel assembly, the cover plate being received in the cavity of the rear panel assembly when the pivot side of the cover plate slides to the bottom of the cavity of the rear panel assembly, the cover plate being flipped over and the free side of the cover plate being locked to the top of the front panel assembly when the pivot side of the cover plate slides to the top of the cavity of the rear panel assembly, the resilient arm being in a deformed state and the free side of the cover plate being tilted upwards during the process of the locking assembly releasing the free side of the cover plate, wherein a pull rod is mounted to the rear panel assembly, and a wheel is mounted on each of the two pairs of sides of the bottom of the front panel assembly and the opposite sides of the bottom of the rear panel assembly.

[0032] According to another aspect of the present invention, the present invention further provides a folding assembly, which includes a first plate, a second plate, and an assembly shaft. The first plate has a fan-shaped first assembly groove, and the second plate has a fan-shaped second assembly groove. The positions of the first assembly groove of the first plate and the second assembly groove of the second plate correspond in the height direction. The cross-sectional shape of the assembly shaft is an arc-shaped arch. A portion of the assembly shaft is assembled into the first assembly groove of the first plate, and another portion is assembled into the second assembly groove of the second plate. By allowing the first plate and the second plate to rotate around the center of the assembly shaft, the folding assembly can switch between a folded state and an unfolded state. When the folding assembly is in the unfolded state, the outer sides of the first plate and the outer sides of the second plate are flush.

[0033] According to one embodiment of the present invention, the first plate has an arc-shaped first inner wall and a second inner wall, the first inner wall and the second inner wall facing each other to form a first assembly groove between the first inner wall and the second inner wall, the center of the first inner wall and the center of the second inner wall coincide. The second plate has an arc-shaped third inner wall and a fourth inner wall, the third inner wall and the fourth inner wall facing each other to form a second assembly groove between the third inner wall and the fourth inner wall, the center of the third inner wall and the center of the fourth inner wall coincide. The assembly shaft has a first axial surface and a second axial surface, the first axial surface and the second axial surface back to back and the center of the first axial surface and the center of the second axial surface coincide. Different positions of the first axial surface of the assembly shaft are respectively in contact with the first inner wall of the first plate and the third inner wall of the second plate, and different positions of the second axial surface of the assembly shaft are respectively in contact with the second inner wall of the first plate and the fourth inner wall of the second plate.

[0034] According to one embodiment of the present invention, the first plate has a first groove forming portion and a first shaft portion. The first groove forming portion has a semi-cylindrical first groove, the first shaft portion is semi-cylindrical, and the first shaft portion protrudes into the first groove forming portion. The first plate forms a fan-shaped first mounting groove between the first groove forming portion and the first shaft portion. The concave surface of the first groove forming portion forms the first inner wall, and the convex surface of the first shaft portion forms the second inner wall. The second plate has a second groove forming portion and a second shaft portion. The second groove forming portion has a semi-cylindrical second groove, the second shaft portion is semi-cylindrical, and the... The second shaft portion protrudes into the second groove of the second groove forming portion. The second plate body forms the second assembly groove between the second groove forming portion and the second shaft portion. The concave surface of the second groove forming portion forms the third inner wall, and the convex surface of the second shaft portion forms the fourth inner wall. The first axial surface of the assembly shaft body is a convex surface, and the second axial surface is a concave surface. Thus, different positions of the first axial surface of the assembly shaft body are respectively in contact with the first inner wall of the first plate body and the third inner wall of the second plate body, and different positions of the second axial surface of the assembly shaft body are respectively in contact with the second inner wall of the first plate body and the fourth inner wall of the second plate body.

[0035] According to one embodiment of the present invention, the first inner wall of the first plate is provided with a first limiting groove, the third inner wall of the second plate is provided with a second limiting groove, and the assembly shaft has a first limiting protrusion and a second limiting protrusion. The first limiting protrusion of the assembly shaft is slidably mounted in the first limiting groove of the first plate. As the first plate rotates, the first limiting protrusion of the assembly shaft can slide within the first limiting groove of the first inner wall to limit the maximum rotation angle of the first plate. The second limiting protrusion of the assembly shaft is slidably mounted in the second limiting groove of the second plate. As the second plate rotates, the second limiting protrusion of the assembly shaft can slide within the second limiting groove of the second inner wall to limit the maximum rotation angle of the second plate.

[0036] According to one embodiment of the present invention, the second groove forming portion of the second plate has an anti-detachment groove, the anti-detachment groove is connected to the second assembly groove, the top of the assembly shaft has an anti-detachment block, the anti-detachment block protrudes into the anti-detachment groove of the second groove forming portion, and as the second plate rotates, the anti-detachment block can slide within the anti-detachment groove of the second groove forming portion.

[0037] According to one embodiment of the present invention, the folding assembly further includes a side panel lock, which is installed on the first panel and is capable of locking and releasing the second panel.

[0038] According to one embodiment of the present invention, the side panel lock includes a lock, a lock body, and a return spring. The lock body is pressably mounted on the lock seat. The opposite ends of the return spring abut against the lock seat and the lock body, respectively. The inner side of the lock body has a lock hook. The lock seat is mounted on the first plate. The second plate has a protrusion with a recessed groove and a hook slit communicating with the recessed groove. After the folding assembly is unfolded, the hook of the lock body protrudes into the recessed groove of the protrusion of the second plate. The restoring force provided by the return spring pushes the lock body upward to cause the hook to engage with the hook slit of the protrusion.

[0039] According to one embodiment of the present invention, the lock seat has a seat groove, an upward-opening first retaining groove, an upward-opening second retaining groove, and two blocking arms. The first retaining groove is located above the seat groove, and the second retaining groove is located in front of the seat groove. The two blocking arms protrude into the second retaining groove from opposite sides at the top opening of the second retaining groove to reduce the size of the top opening of the second retaining groove. The lock body has an insertion post, a first retaining arm, a second retaining arm, and two blocking arms. The two blocking arms extend outward from opposite sides of the second retaining arm. The insertion post, the first retaining arm, and the second retaining arm of the lock body are respectively inserted into the seat groove, the first retaining groove, and the second retaining groove of the lock seat. The two blocking arms of the lock body are blocked by the two blocking arms of the lock seat to prevent the lock body from falling off the lock seat. Attached Figure Description

[0040] Figure 1 This is a perspective view of a trolley after it has been unfolded, according to a preferred embodiment of the present invention.

[0041] Figure 2 This is a perspective view of the trolley after it has been unfolded according to the preferred embodiment of the present invention.

[0042] Figure 3 This is an exploded view of the trolley after it has been unfolded according to the above-described preferred embodiment of the present invention.

[0043] Figure 4 This is an exploded view of the trolley after it has been unfolded according to the above-described preferred embodiment of the present invention.

[0044] Figure 5This is a three-dimensional cross-sectional view of the trolley after it has been unfolded, according to the above-described preferred embodiment of the present invention.

[0045] Figure 6 This is a perspective view of one side panel assembly of the trolley according to the above-described preferred embodiment of the present invention after being unfolded.

[0046] Figure 7 This is a cross-sectional view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention after it has been unfolded.

[0047] Figure 8 This is an exploded view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention after it has been unfolded.

[0048] Figure 9 This is an exploded view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention after it has been unfolded.

[0049] Figure 10 This is a partial perspective view of the unlocking process of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0050] Figure 11 This is a partial perspective view of another angle showing the unlocking process of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0051] Figure 12 This is a schematic diagram of one of the folding processes of the trolley according to the above-described preferred embodiments of the present invention.

[0052] Figure 13 This is a schematic diagram of the second folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0053] Figure 14 This is a schematic diagram of the third folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0054] Figure 15 This is a schematic diagram of the fourth folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0055] Figure 16 This is a schematic diagram of the fifth folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0056] Figure 17 This is a schematic diagram of the sixth folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0057] Figure 18 This is a schematic diagram of the seventh folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0058] Figure 19 This is a schematic diagram of the eighth step of the folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0059] Figure 20 This is a schematic diagram of the ninth step of the folding process of the trolley according to the above-described preferred embodiment of the present invention.

[0060] Figure 21 This is a perspective view of a cart according to another preferred embodiment of the present invention.

[0061] Figure 22 This is a cross-sectional view of the cart according to the above-described preferred embodiment of the present invention.

[0062] Figure 23 This is another cross-sectional view of the cart according to the above-described preferred embodiment of the present invention.

[0063] Figure 24 This is an exploded view of the structural relationship between a cover plate and a locking assembly of a storage device for a trolley according to the above-described preferred embodiment of the present invention.

[0064] Figure 25 This is an exploded view of the structural relationship between the cover plate and the lock assembly of the storage device of the trolley according to the above-described preferred embodiment of the present invention.

[0065] Figure 26 This is a perspective view of a trolley after it has been unfolded, according to another preferred embodiment of the present invention.

[0066] Figure 27 This is a perspective view of a side panel assembly of the trolley according to the above-described preferred embodiment of the present invention in an unfolded state.

[0067] Figure 28 This is a perspective view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention when it switches from an unfolded state to a folded state.

[0068] Figure 29 This is a perspective view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention in a folded state.

[0069] Figure 30 This is an exploded view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0070] Figure 31 This is an exploded view of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0071] Figure 32 This is a side view schematic diagram of the side panel assembly of the trolley according to the above preferred embodiment of the present invention.

[0072] Figures 33 to 35 It is along Figure 32 The diagram shows cross-sectional views of the first side plate, the second side plate, and the assembly shaft of the side plate assembly in different states after being cut along line AA.

[0073] Figures 36 to 38 It is along Figure 32 The BB line shows cross-sectional views of the first side plate, the second side plate, and the assembly shaft of the side plate assembly in different states.

[0074] Figures 39 to 41 It is along Figure 32 The cross-sectional view of the first side plate, the second side plate, and the assembly shaft of the side plate assembly in different states after being cut along the CC line.

[0075] Figure 42 This is a cross-sectional schematic diagram of one position of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention when the side panel assembly is in a certain state.

[0076] Figure 43 This is a cross-sectional schematic diagram showing the partial position of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention when the side panel assembly is in another state.

[0077] Figure 44 This is a cross-sectional view of another position of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention when the side panel assembly is in one state.

[0078] Figure 45 This is a cross-sectional schematic diagram showing the partial position of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention when the side panel assembly is in another state.

[0079] Figure 46 This is a perspective view of one of the assembly processes of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0080] Figure 47 This is a perspective view of the second assembly process of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0081] Figure 48 This is a perspective view of the third assembly process of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0082] Figure 49This is a perspective view of the fourth assembly process of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention.

[0083] Figure 50 This is a perspective view of the fifth assembly process of the side panel assembly of the trolley according to the above-described preferred embodiment of the present invention. Detailed Implementation

[0084] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0085] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0086] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0087] Refer to the accompanying drawings of the specification of this invention. Figures 1 to 20 A preferred embodiment of the present invention will be disclosed and described in the following description, wherein the trolley includes a storage device 100, a pull rod 200 and a set of wheels 300, the pull rod 200 being mounted on one side of the storage device 100 and the wheels 300 being mounted on the bottom of the storage device 100.

[0088] Specifically, the storage device 100 includes a front panel assembly 10, a rear panel assembly 20, two side panel assemblies 30, and a bottom panel assembly 40, and the storage device 100 has a storage cavity 50. The front panel assembly 10 and the rear panel assembly 20 are arranged face-to-face. Each side panel assembly 30 includes a first side panel 31, a second side panel 32, and a transition plate 33. One side of the first side panel 31 and one side of the second side panel 32 are rotatably mounted on opposite sides of the transition plate 33. The other side of the first side panel 31 of one side panel assembly 30 (i.e., the side of the first side panel 31 facing away from the transition plate 33) is rotatably mounted on one side of the rear panel assembly 20, and the other side of the second side panel 32 (i.e., the side facing away from the transition plate 33) is rotatably mounted on one side of the rear panel assembly 20. The side of the second side plate 32 facing away from the adapter plate 33 is rotatably mounted to one side of the front panel assembly 10. The other side of the first side plate 31 of another side panel assembly 30 (i.e., the side of the first side plate 31 facing away from the adapter plate 33) is rotatably mounted to the other side of the rear panel assembly 20. The other side of the second side plate 32 (i.e., the side of the second side plate 32 facing away from the adapter plate 33) is rotatably mounted to the other side of the front panel assembly 10. After the storage device 100 is unfolded, the four edges of the bottom panel assembly 40 are respectively connected to the bottom of the front panel assembly 10, the bottom of the rear panel assembly 20, and the bottom of each of the side panel assemblies 30, thereby forming the storage cavity 50 between the front panel assembly 10, the rear panel assembly 20, each of the side panel assemblies 30, and the bottom panel assembly 40.

[0089] Unlike existing technologies, in the trolley of the present invention, the first side plate 31 and the second side plate 32 of the side plate assembly 30 of the storage device 100 are not directly shaft-connected. Instead, one side of the first side plate 31 is shaft-connected to one side of the adapter plate 33, and one side of the second side plate 32 is shaft-connected to the other side of the adapter plate 33. In this way, after the storage device 100 is unfolded, the outer sides of the first side plate 31, the outer sides of the adapter plate 33, and the outer sides of the second side plate 32 are flush, making the outer side of the side plate assembly 30 flat without any protrusions. This not only improves the aesthetics of the trolley but also facilitates printing or applying films to the side plate assembly 30.

[0090] In this invention, the pull rod 200 is mounted on the rear plate assembly 20, and a wheel 300 is mounted on each of the opposite sides of the bottom of the front plate assembly 10 and the opposite sides of the bottom of the rear plate assembly 20.

[0091] Reference Appendix Figures 2 to 5The base plate assembly 40 includes two base plate units 41, each of which has two opposite ends that can be folded upwards. One of the base plate units 41 has two opposite ends that are rotatably connected to the bottom of the first side plate 31 of the two side plate assemblies 30. The folding axis of this base plate unit 41 and the rotation axis of this base plate unit 41 with the first side plate 31 have an acute angle. The other base plate unit 41 has two opposite ends that are rotatably connected to the bottom of the second side plate 32 of the two side plate assemblies 30. The folding axis of this base plate unit 41 and the rotation axis of this base plate unit 41 with the second side plate 32 have an acute angle. In this way, after the storage device 100 is unfolded, the opposite ends of the base plate assembly 40 are connected to the bottom of each of the side plate assemblies 30.

[0092] Additionally, after the storage device 100 is unfolded, refer to the attached document. Figure 5 One of the base plate units 41 has its edge resting against the bottom of the front plate assembly 10, so that the edge of the base plate assembly 40 is connected to the bottom of the front plate assembly 10, and the other base plate unit 41 has its edge resting against the bottom of the rear plate assembly 20, so that the edge of the base plate assembly 40 is connected to the bottom of the rear plate assembly 20.

[0093] In other words, in this embodiment of the present invention, the opposite ends of one bottom plate unit 41 of the bottom plate assembly 40 are rotatably connected to the bottom of the first side plate 31 of the two side plate assemblies 30, and the opposite ends of the other bottom plate unit 41 are rotatably connected to the bottom of the second side plate 32 of the two side plate assemblies 30. After the storage device 100 is unfolded, the edge of one bottom plate unit 41 of the bottom plate assembly 40 is connected to the bottom of the front plate assembly 10 by abutting against the front plate assembly 10, and the edge of the other bottom plate unit 41 is connected to the bottom of the rear plate assembly 20 by abutting against the bottom of the rear plate assembly 20, thereby forming the storage cavity 50 between the front plate assembly 10, the rear plate assembly 20, each of the side plate assemblies 30 and the bottom plate assembly 40, and ensuring the load-bearing capacity of the bottom plate assembly 40.

[0094] Further, see Appendix Figures 3 to 5The base plate unit 41 includes a generally triangular base plate main plate 411 and two triangular base plate sub-plates 412. The base plate main plate 411 has a first main plate short side 4111, a second main plate short side 4112, and a main plate long side 4113. The base plate sub-plates 412 have a first sub-plate short side 4121, a second sub-plate short side 4122, and a sub-plate long side 4123. The sub-plate long side 4123 of one base plate sub-plate 412 and the first main plate short side 4111 of the base plate main plate 411 are connected by an axis to form a folding axis of the base plate unit 41. The sub-plate long side 4123 of the other base plate sub-plate 412 and the second main plate short side 4112 of the base plate main plate 411 are connected by an axis. This forms another folding axis for the base plate unit 41. The short sides 4121 of the first sub-plates of the two base plate sub-plates 412 of one base plate unit 41 and the bottoms of the first side plates 31 of the two side plate assemblies 30 are connected by an axis to form a rotation axis between the base plate unit 41 and the first side plates 31. The short sides 4121 of the first sub-plates of the two base plate sub-plates 412 of the other base plate unit 41 and the bottoms of the second side plates 32 of the two side plate assemblies 30 are connected by an axis to form a rotation axis between the base plate unit 41 and the second side plates 32. In this way, the base plate assembly 40 can be smoothly folded and unfolded, thereby allowing the storage device 100 to be smoothly folded and unfolded. Understandably, after the storage device 100 is unfolded, the long side 4113 of the main board 411 of one base plate unit 41 is placed against the bottom of the front plate assembly 10, the long side 4113 of the main board 411 of another base plate unit 41 is placed against the bottom of the rear plate assembly 20, and the short side 4122 of the second sub-plate of one base plate unit 41 and the short side 4122 of the second sub-plate of the other base plate unit 41 abut against each other.

[0095] Further, see Appendix Figures 6 to 11The adapter plate 33 has a first groove 331 on one side. The adapter plate 33 has at least one pair of first pivot arms 332 in the first groove 331. Each first pivot arm 332 has a first mounting hole 3321. A first pivot cavity 333 is formed between the pair of first pivot arms 332. The first mounting hole 3321 of the first pivot arm 332 communicates with the first pivot cavity 333. The first side plate 31 has a first protruding arm 311 and at least one first pivot shaft 312 disposed on the first protruding arm 311. The first protruding arm 311 of the first side plate 31 protrudes into the first groove 331 of the adapter plate 33. The first pivot shaft 312 is located in the first pivot cavity 333, and its opposite ends extend into the first mounting holes 3321 of the pair of first pivot arms 332, so that the first side plate 31 is rotatably mounted on that side of the adapter plate 33. Correspondingly, the other side of the adapter plate 33 has a second groove 334. The adapter plate 33 has at least a pair of second pivot arms 335 in the second groove 334. The second pivot arm 335 has a second mounting hole 3351. A second pivot cavity 336 is formed between the pair of second pivot arms 335. The second mounting hole 3351 of the second pivot arm 335 communicates with the second pivot cavity 336. The second side plate 32 has a second protruding arm 321 and at least one second pivot shaft 322 disposed on the second protruding arm 321. The second protruding arm 321 of the second side plate 32 protrudes into the second groove 334 of the adapter plate 33. The second pivot shaft 322 is located in the second pivot cavity 336, and the opposite ends of the second pivot shaft 322 extend into the second mounting holes 3351 of the pair of second pivot arms 335, so that the second side plate 32 is rotatably mounted on this side of the adapter plate 33.

[0096] In this embodiment of the invention, the adapter plate 33 has three pairs of first pivot arms 332 in the first groove 331. Correspondingly, the first side plate 31 has three first pivot shafts 312 in the first protruding arm 311. The opposite ends of each first pivot shaft 312 extend into the first mounting holes 3321 of each pair of first pivot arms 332 to reliably connect one side of the first side plate 31 and one side of the adapter plate 33. Correspondingly, the adapter plate 33 has three pairs of second pivot arms 335 in the second groove 334. Correspondingly, the second side plate 32 has three second pivot shafts 322 in the second protruding arm 321. The opposite ends of each second pivot shaft 322 extend into the second mounting holes 3351 of each pair of second pivot arms 335 to reliably connect one side of the second side plate 32 and the other side of the adapter plate 33.

[0097] Further, see Appendix Figure 8 and Figure 9 The adapter plate 33 has at least one first rib 337 in the first groove 331 and at least one second rib 338 in the second groove 335. The first rib 337 and the second rib 338 of the first adapter plate 33 can increase the structural strength of the adapter plate 33. That is, the first rib 337 and the second rib 338 of the first adapter plate 33 play the role of reinforcing ribs. The first side plate 31 has at least one first abutment arm 313, which is disposed on the first protruding arm 311. The second side plate 32 has at least one second abutment arm 323, which is disposed on the second protruding arm 321. After the storage device 100 is unfolded, the first abutment arm 313 of the first side plate 31 abuts against the first protruding rib 337 of the adapter plate 33 to limit the rotation angle of the first side plate 31. The second abutment arm 323 of the second side plate 32 abuts against the second protruding rib 338 of the adapter plate 33 to limit the rotation angle of the second side plate 332. Thus, when the item stored in the storage cavity 50 pushes the side plate assembly 30 outward, the storage device 100 can prevent the side plate assembly 30 from protruding outward, thereby increasing the load-bearing capacity of the side plate assembly 30 and improving the reliability of the storage device 100.

[0098] In this embodiment of the invention, the adapter plate 33 has a plurality of first protruding ribs 337 in the first groove 331, and these first protruding ribs 337 are arranged at intervals along the height direction. The first side plate 31 has a plurality of first abutting arms 313, and these first abutting arms 313 are arranged at intervals along the height direction. After the storage device 100 is unfolded, each of the first abutting arms 313 of the first side plate 31 abuts against each of the first protruding ribs 337 of the adapter plate 33. Correspondingly, the adapter plate 33 has a plurality of second protruding ribs 338 in the second groove 335, and these second protruding ribs 338 are arranged at intervals along the height direction. The second side plate 32 has a plurality of second abutting arms 323, and these second abutting arms 323 are arranged at intervals along the height direction. After the storage device 100 is unfolded, each of the second abutting arms 323 of the second side plate 32 abuts against each of the second protruding ribs 338 of the adapter plate 33.

[0099] Preferably, the first abutment arm 313 of the first side plate 31 is disposed in the space between the two first pivot shafts 312, and the second abutment arm 323 of the second side plate 32 is disposed in the space between the two second pivot shafts 322.

[0100] Further, see Appendix Figures 6 to 10 The side panel assembly 30 also includes a side panel lock 34, which is movably mounted on the top of the adapter plate 33. After the storage device 100 is unfolded, the side panel lock 34 can lock the first side panel 31, the second side panel 32 and the adapter plate 33 to prevent the side panel assembly 30 from folding automatically.

[0101] Specifically, the top of the adapter plate 33 has a groove 339, the outer side of the side plate lock 34 has a slider 341, and the inner side of the side plate lock 34 has an upper hook block 342 and a lower hook block 343. The slider 341 of the side plate lock 34 is slidably mounted on the groove 339 of the adapter plate 33. The top of one side of the first side plate 31 has a first protrusion 314, which has a first recessed groove 3141 and a first hook slit 3142 extending upward from the first recessed groove 3141. The top of one side of the second side plate 32 has a second protrusion 324, which has a second recessed groove 3241 and a second hook slit 3242 extending upward from the second recessed groove 3241. After the storage device 100 is unfolded, the upper hook 342 of the side panel lock 34 protrudes into the first recessed groove 3141 of the first protrusion 314 of the first side panel 31, and the lower hook 343 protrudes into the second recessed groove 3241 of the second protrusion 324 of the second side panel 32. When the side panel lock 34 is pulled upward, the upper hook 342 of the side panel lock 34 hooks into the first hook slot 3142 of the first protrusion 314 of the first side panel 31, and the lower hook 343 hooks into the second hook slot 3242 of the second protrusion 324 of the second side panel 32. In this way, the side panel lock 34 locks the first side panel 31, the second side panel 32, and the adapter plate 33, preventing the side panel assembly 30 from folding automatically. Understandably, when unlocking is required, pressing down on the side panel lock 34 causes the upper hook block 342 of the side panel lock 34 to disengage from the first hook slot 3142 of the first protrusion 314 of the first side panel 31, and the lower hook block 343 to disengage from the second protrusion 324 of the second side panel 32. This allows the first side panel 31 and the second side panel 32 to rotate relative to the adapter plate 33. Preferably, the slide groove 339 of the adapter plate 33 is a dovetail groove, and correspondingly, the shape and size of the slider 341 of the side panel lock 34 matches the shape and size of the slide groove 330 of the adapter plate 33.

[0102] Continue to refer to the appendix Figures 6 to 11The present invention also provides a folding assembly 3000, which includes a first plate 3001, a second plate 3002, and a connecting plate 3003. The first plate 3001 and the second plate 3002 are rotatably mounted on opposite sides of the connecting plate 3003. By rotating the first plate 3001 and the second plate 3002, the folding assembly 3000 can switch between an unfolded state and a folded state. When the folding assembly 3000 is in the unfolded state, the outer sides of the first plate 3001, the connecting plate 3003, and the second plate 3002 are flush, so that the outer side of the folding assembly 3000 is flat and has no protrusions. When the folding assembly 3000 is in the folded state, the outer sides of the first plate 3001 and the second plate 3002 can be fitted together to reduce the space occupied by the folding assembly 3000. Preferably, when the folding assembly 300 is in the unfolded state, the inner sides of the first plate 3001 and the second plate 3002 can also be flat without any protrusions.

[0103] In one embodiment of the present invention, the folding assembly 3000 can be applied to the storage device 1000, such that the folding assembly 3000 forms the side panel assembly 30, and the first plate 3001, the second plate 3002 and the connecting plate 3003 of the folding assembly 3000 respectively form the first side panel 31, the second side panel 32 and the adapter plate 33 of the side panel assembly 30.

[0104] It is worth mentioning that the connection structure between the first plate 3001 and the connecting plate 3003, and the connection structure between the second plate 3002 and the connecting plate 3003, are consistent with the connection structure between the first side plate 31 and the adapter plate 33, and the connection structure between the second side plate 32 and the adapter plate 33. Therefore, this invention will not elaborate further. It is understood that, similar to the side plate assembly 30, the folding assembly 3000 of this invention may also include the side plate lock 34.

[0105] Further, see Appendix Figure 1 , Figures 3 to 5The rear panel assembly 20 has a cavity 21, and the storage device 100 includes a cover plate 60. The cover plate 60 has a pivot side 61 and a free side 62 relative to the pivot side 61. The pivot side 61 of the cover plate 60 is slidably mounted to the rear panel assembly 20. When the pivot side 61 of the cover plate 60 slides to the bottom of the cavity 21 of the rear panel assembly 20, the cover plate 60 is received in the cavity 21 of the rear panel assembly 20. At this time, the opening of the storage cavity 50 is exposed to allow a user to take or put in items through the opening. When the pivot side 61 of the cover plate 60 slides to the top of the cavity 21 of the rear panel assembly 20, the cover plate 60 can be flipped to close the opening of the storage cavity 50.

[0106] In this embodiment of the invention, the storage device 100 includes a locking assembly 70, which is disposed on the top of the front panel assembly 10. When the cover plate 60 closes the opening of the storage cavity 50, the locking assembly 70 locks the free side 62 of the cover plate 60, thereby preventing the cover plate 60 from opening automatically when the trolley is pulled.

[0107] Specifically, the top of the front panel assembly 10 has a mounting groove 11 with an outer opening and a hook hole 12 extending from the mounting groove 11 to the inner side of the front panel assembly 10. The lock assembly 70 includes a lock body 71 and a compression spring 72. The lock body 71 further includes a lock block 711 and a hook 712 integrally extending from the lock block 711. The lock block 711 is pressably mounted in the mounting groove 11 of the front panel assembly 10. The hook 712 extends through the hook hole 12 to the inner side of the front panel assembly 10. The opposite ends of the compression spring 72 abut against the lock block 711 and the front panel assembly 10, respectively. The free side 62 of the cover plate 60 has a hook 63. When the cover plate 60 closes the opening of the receiving cavity 50, the locking hook 712 of the lock body 71 hooks the hook 63 of the cover plate 60, so that the cover plate 60 is held in the position of closing the opening of the receiving cavity 50. When the locking block 711 is pressed inward, the locking block 711 drives the locking hook 712 to move inward synchronously. Therefore, the locking hook 712 disengages from the hook 63 of the cover plate 60, and the lock assembly 70 releases the cover plate 60, so that the cover plate 60 can be flipped upward to open the opening of the receiving cavity 50.

[0108] In this embodiment of the invention, when the free side 62 of the cover plate 60 is locked by the locking assembly 70 and held by the cover plate 60 in a position that closes the opening of the receiving cavity 50, the cover plate 60 is surrounded by the front plate assembly 10, the rear plate assembly 20 and each of the side plate assemblies 30, respectively, to increase the aesthetics of the trolley. After the locking assembly 70 releases the free side 62 of the cover plate 60, in order to facilitate the user to flip the cover plate 60, the cover plate 60 is provided with at least one elastic arm 64 on the pivot side 61. When the cover plate 60 closes the opening of the storage cavity 50 and the locking assembly 70 locks the free side 62 of the cover plate 60, the upper part of the end of the elastic arm 64 is blocked by the top edge of the cavity 21 of the rear plate assembly 20 and the elastic arm 64 is in a deformed state. After the locking assembly 70 releases the free side 62 of the cover plate 60, the elastic arm 64 causes the free side 62 of the cover plate 60 to tilt upward during the process of returning to the initial state. At this time, the user can hold the free side 62 of the cover plate 60 with his / her hand and flip the cover plate 60 upward.

[0109] Preferably, the cover plate 60 has a plurality of elastic arms 64, which are spaced apart from each other on the pivot side 61 along the width direction of the cover plate 60, so that the elastic arms 64 can provide sufficient elasticity after the locking assembly 70 releases the free side 62 of the cover plate 60.

[0110] Appendix Figures 12 to 20 The folding process of the trolley according to the present invention is shown. (See attached diagram.) Figure 12 and Figure 13 Pressing the lock body 71 inward causes the lock hook 712 to release the free side 62 of the cover plate 60. During the return to its initial state, the elastic arm 64 tilts the free side 62 of the cover plate 60 upward, allowing the user to grip the free side 62 and flip the cover plate 60 upward. (See attached document.) Figures 14 to 17 The cover plate 60 can be entirely housed within the cavity 21 of the rear plate assembly 20. (See attached diagram.) Figure 18 and Figure 19 Pressing down on the side panel lock 34 releases the first side panel 31 and the second side panel 32, allowing them to rotate relative to the adapter plate 33 to fold the side panel assembly 30. Simultaneously, the bottom plate assembly 40 is folded, and the folded side panel assembly 30 and bottom plate assembly 40 are clamped between the front plate assembly 10 and the rear plate assembly 20. (See attached diagram) Figure 20 This allows the lever 200 to retract, thus completing the folding of the trolley.

[0111] Figures 21 to 25 A trolley according to another preferred embodiment of the invention is shown, with an attached... Figures 1 to 20 Unlike the cart shown, in the attached Figures 21 to 25 In this specific example of the trolley of the present invention shown, the locking assembly 70 is disposed on the free side 62 of the cover plate 60. When the cover plate 60 closes the opening of the storage cavity 50, the locking assembly 70 locks the top of the front plate assembly 10, thereby preventing the cover plate 60 from opening automatically when the trolley is pulled.

[0112] Specifically, the mounting groove 11 and the locking hook hole 12 are provided on the free side 62 of the cover plate 60. The lock assembly 70 includes the lock body 71 and the compression spring 72. The lock body 71 further includes a slider 713 and a locking protrusion 714 integrally extending from the slider 713. The slider 713 is slidably mounted in the mounting groove 11 of the cover plate 60. The locking protrusion 714 extends through the locking hook hole 12 to a position protruding from the free side 62 of the cover plate 60. The opposite ends of the compression spring 72 abut against the locking block 711 and the cover plate 60, respectively. The front panel assembly 10 has a locking groove 13. When the cover plate 60 closes the opening of the receiving cavity 50, the locking protrusion 714 of the lock body 71 extends into the locking groove 13 of the front panel assembly 10, so that the cover plate 60 is held in the position of closing the opening of the receiving cavity 50. At this time, the upper part of the end of the elastic arm 64 is blocked by the top edge of the plate cavity 21 of the rear panel assembly 20 and the elastic arm 64 is in a deformed state. When the slider 713 is oriented towards the pivot side 61 near the cover plate 60... When sliding, the slider 713 drives the locking protrusion 714 to slide synchronously, so the locking protrusion 714 disengages from the locking groove 13 of the front panel assembly 10, the locking assembly 70 releases the front panel assembly 10, and the elastic arm 64 causes the free side 62 of the cover plate 60 to tilt upward during the process of returning to the initial state. At this time, the user can hold the free side 62 of the cover plate 60 with his hand and flip the cover plate 60 upward, so that the cover plate 60 can be flipped upward to open the cavity of the receiving cavity 50.

[0113] Preferably, the slider 713 has an insert post 7131, and the cover plate 60 has a receiving groove 65 communicating with the mounting groove 11, wherein the insert post 7131 of the slider 713 is inserted into one end of the compression spring 72, and the other end of the compression spring 72 extends into the receiving groove 65 of the cover plate 60, so that the opposite ends of the compression spring 72 can reliably abut against the locking block 711 and the cover plate 60.

[0114] Furthermore, the slider 713 has a lever groove 7132, and the locking assembly 70 also includes a locking plate 73. The middle portions of opposite sides of the locking plate 73 are rotatably mounted on the inner wall of the cover plate 60 for forming the mounting groove 11. A lever 731 is provided at one end of the locking plate 73 near the free side 62 of the cover plate 60. The lever 731 extends into the lever groove 7132 of the slider 713, and the lever 731 fits against the inner wall of the slider 713 for forming the lever groove 7132. In its natural state, the top surface of the locking plate 73 is flush with the top surface of the cover plate 60. When the side of the locking plate 73 near the free side 62 of the cover plate 60 is pressed down, the lever 731 of the locking plate 73 applies force to the slider 713, causing the slider 713 and the locking protrusion 714 to slide towards the pivot side 61 of the cover plate 60, so that the locking protrusion 714 disengages from the locking groove 13 of the front plate assembly 10. At this time, the compression spring 72 is compressed and deformed to accumulate elastic potential energy. After the locking plate 73 is released, the compression spring 72 pushes the slider 713 and the locking protrusion 714 towards the free side 62 of the cover plate 60 during the process of returning to the initial state, and the top surface of the locking plate 73 and the top surface of the cover plate 60 can return to being flush.

[0115] Furthermore, the lock assembly 70 includes a bottom cover 74, which is installed on the cover plate 60 to close the bottom opening of the mounting groove 11 of the cover plate 60. That is, the bottom cover 74 can form the bottom of the mounting groove 11 of the cover plate 60, thereby facilitating the installation of the lock assembly 70 on the cover plate 60. Specifically, the process of installing the lock assembly 70 onto the cover plate 60 can be as follows: First, allow one end of the lock plate 73 to extend from the bottom to the top of the cover plate 60 through the mounting groove 11 of the cover plate 60, and allow the pivots 732 on opposite sides of the lock plate 73 to respectively engage with the pivots 66 on opposite sides of the mounting groove 11 of the cover plate 60; second, insert the insertion post 7131 of the slider 713 into one end of the compression spring 72; third, install the slider 713 into the mounting groove 11 of the cover plate 60 such that the locking protrusion 714 passes through the lock hole 12 of the cover plate 60, and the other end of the compression spring 72 is located in the receiving groove 65 of the cover plate 60; finally, install the bottom cover 74 onto the bottom of the cover plate 60, and the bottom opening of the mounting groove 11 of the cover plate 60 is closed by the bottom cover 74.

[0116] In an embodiment of the present invention, the cover plate 60 is provided with at least one slot 67 at one end of the mounting groove 11 and at least one hook groove 68 at the other end of the mounting groove 11. The bottom cover 74 is provided with at least one locking arm 741 at one end and at least one hook arm 742 at the other end. After the locking arm 741 of the bottom cover 74 is engaged with the slot 67 of the cover plate 60, the end of the bottom cover 74 with the hook arm 742 is pushed upward to allow the hook arm 742 of the bottom cover 74 to hook the cover plate 60 after passing through the hook groove 68 of the cover plate 60, thereby installing the bottom cover 74 on the bottom of the cover plate 60.

[0117] Preferably, the cover plate 60 has three slots 67 and two hook slots 68. Correspondingly, the bottom cover 74 has three locking arms 741 and two hook arms 742. After each locking arm 741 of the bottom cover 74 is engaged with each slot 67 of the cover plate 60, each hook arm 742 of the bottom cover 74 can hook the cover plate 60 after passing through each hook slot 68 of the cover plate 60, so as to reliably install the bottom cover 74 onto the cover plate 60.

[0118] Appendix Figures 26 to 50 A trolley according to another preferred embodiment of the invention is shown, with an attached... Figures 21 to 25 The difference between the trolley shown and the side panel assembly 30 is the specific structure of the side panel assembly 30, which is attached. Figures 26 to 50 In this specific example of the trolley shown, the side panel assembly 30 does not require the adapter plate 33.

[0119] Specifically, the side panel assembly 30 includes a first side panel 31, a second side panel 32, and at least one mounting shaft 35. The first side panel 31 has at least one fan-shaped first mounting groove 315, and the second side panel 32 has at least one fan-shaped second mounting groove 325. The positions of the first mounting groove 315 of the first side panel 31 and the second mounting groove 325 of the second side panel 32 correspond in the height direction. The cross-sectional shape of the mounting shaft 35 is an arc-shaped arch. A portion of the mounting shaft 35 is mounted in the first mounting groove 315 of the first side panel 31, and another portion of the mounting shaft 35 is mounted in the second mounting groove 325 of the second side panel 32. By allowing the first side panel 31 and the second side panel 32 to rotate around the center of the mounting shaft 35, the side panel assembly 30 can be folded and unfolded.

[0120] In an embodiment of the present invention, the first side plate 31 has an arc-shaped first inner wall 316 and an arc-shaped second inner wall 317, the first inner wall 316 and the second inner wall 317 facing each other to form a first mounting groove 315 between the first inner wall 316 and the second inner wall 317, the center of the first inner wall 316 and the center of the second inner wall 317 coinciding. The second side plate 32 has an arc-shaped third inner wall 326 and an arc-shaped fourth inner wall 327, the third inner wall 326 and the fourth inner wall 327 facing each other to form a second mounting groove 325 between the third inner wall 326 and the fourth inner wall 327, the center of the third inner wall 326 and the center of the fourth inner wall 327 coinciding. The assembly shaft 35 has a first shaft surface 351 and a second shaft surface 352, the first shaft surface 351 and the second shaft surface 352 are back to back and the center of the first shaft surface 351 and the center of the second shaft surface 352 coincide. Different positions of the first axial surface 351 of the assembly shaft 35 are respectively attached to the first inner wall 316 of the first side plate 31 and the third inner wall 326 of the second side plate 32. Different positions of the second axial surface 352 are respectively attached to the second inner wall 317 of the first side plate 31 and the fourth inner wall 327 of the second side plate 32. In this way, on the one hand, it can be ensured that the first side plate 31 and the second side plate 32 can rotate around the center of the assembly shaft 35, so that the side plate assembly 30 can be folded and unfolded. On the other hand, after the side plate assembly 30 is unfolded, the outer sides of the first side plate 31 and the second side plate 32 are flush and have no protrusions, which is convenient for printing or film application. Furthermore, there is no wobbling between the first side plate 31 and the assembly shaft 35, or between the second side plate 32 and the assembly shaft 35, which helps to ensure the reliability and stability of the side plate assembly 30.

[0121] Specifically, the first side plate 31 has a first groove forming portion 318 and a first shaft portion 319. The first groove forming portion 318 has a semi-cylindrical first groove 3181, and the first shaft portion 319 is semi-cylindrical. The first shaft portion 319 protrudes into the first groove 3181 of the first groove forming portion 318. Thus, the first side plate 31 forms a fan-shaped first mounting groove 315 between the first groove forming portion 318 and the first shaft portion 319. The concave surface of the first groove forming portion 318 forms the first inner wall 316, and the convex surface of the first shaft portion 319 forms the second inner wall 317. Accordingly, the second side plate 32 has a second groove forming portion 328 and a second shaft portion 329. The second groove forming portion 328 has a semi-cylindrical second groove 3281, and the second shaft portion 329 is semi-cylindrical. The second shaft portion 329 protrudes into the second groove 3281 of the second groove forming portion 328. Thus, the second side plate 32 forms a fan-shaped second mounting groove 325 between the second groove forming portion 328 and the second shaft portion 329. The concave surface of the second groove forming portion 328 forms the third inner wall 326, and the convex surface of the second shaft portion 329 forms the fourth inner wall 327. The first shaft surface 351 of the assembly shaft 35 is a convex surface, and the second shaft surface 352 is a concave surface. Thus, different positions of the first shaft surface 351 of the assembly shaft 35 can respectively fit with the first inner wall 316 of the first side plate 31 and the third inner wall 326 of the second side plate 32, and different positions of the second shaft surface 352 can respectively fit with the second inner wall 317 of the first side plate 31 and the fourth inner wall 327 of the second side plate 32.

[0122] In the appendix Figures 26 to 50 In this specific example of the trolley shown, one of the mounting shafts 35 is used to mount the first side plate 31 and the second side plate 32 on the top of the side plate assembly 30, and another mounting shaft 35 is used to mount the first side plate 31 and the second side plate 32 on the bottom of the side plate assembly 30. This not only helps to improve the structural stability of the side plate assembly 30, but also makes the folding and unfolding of the side plate assembly 30 smoother.

[0123] In an embodiment of the present invention, the top of the first side plate 31 has a first groove forming portion 318 and a first shaft portion 319, and the top of the second side plate 32 has two second groove forming portions 328 and two second shaft portions 329. The first groove forming portion 318 of the first side plate 31 is respectively held above and below a second groove forming portion 328 of the second side plate 32, and the first shaft portion 319 of the first side plate 31 is respectively held above and below a second shaft portion 329 of the second side plate 32. In this way, the middle part of the assembly shaft 35 is assembled into the first assembly groove 315 of the first side plate 31, and the top and bottom of the assembly shaft 35 are respectively assembled into a second assembly groove 325 of the second side plate 32. In this way, the assembly shaft 35 can reliably assemble the first side plate 31 and the second side plate 32, and ensure the stability of the first side plate 31 and the second side plate 32 during folding and unfolding.

[0124] Preferably, after the side panel assembly 30 is unfolded, the first groove forming portion 318 of the first side panel 31 rests against the second side panel 32, and the second groove forming portion 328 of the second side panel 32 rests against the first side panel 31, so as to improve the load-bearing capacity of the side panel assembly 30.

[0125] Furthermore, the first inner wall 316 of the first side plate 31 is provided with a first limiting groove 3161, and the third inner wall 326 of the second side plate 32 is provided with a second limiting groove 3261. The assembly shaft 35 has at least one first limiting protrusion 353 and at least one second limiting protrusion 354. The first limiting protrusion 353 of the assembly shaft 35 is slidably mounted in the first limiting groove 3161 of the first inner wall 316 of the first side plate 31. As the first side plate 31 rotates, the first limiting protrusion 353 of the assembly shaft 35 slides in the first limiting groove 3161 of the first inner wall 316. When the rotation angle of the first side plate 31 reaches a preset angle (e.g., 90°), the assembly shaft 35... The first limiting protrusion 353 is blocked by the portion of the first inner wall 316 of the first side plate 31 used to form the first limiting groove 3161. The second limiting protrusion 354 of the assembly shaft 35 is slidably mounted in the second limiting groove 3261 of the third inner wall 326 of the second side plate 32. As the second side plate 32 rotates, the second limiting protrusion 354 of the assembly shaft 35 slides in the second limiting groove 3261 of the third inner wall 326. When the rotation angle of the second side plate 32 reaches a preset angle (e.g., 90°), the second limiting protrusion 354 of the assembly shaft 35 is blocked by the portion of the third inner wall 326 of the second side plate 32 used to form the second limiting groove 3261. In other words, the first limiting groove 3161 of the first inner wall 316 of the first side plate 31 and the first limiting protrusion 353 of the assembly shaft 35 cooperate to limit the maximum angle of rotation of the first side plate 31. Correspondingly, the second limiting groove 3261 of the third inner wall 326 of the second side plate 32 and the second limiting protrusion 354 of the assembly shaft 35 cooperate to limit the maximum angle of rotation of the second side plate 32. Thus, after the side plate assembly 30 is folded, the assembly shaft 35 is prevented from detaching from the first side plate 31 and / or the second side plate 32. Furthermore, with such a structure, in embodiments where an assembly shaft 35 is provided at the top and bottom of the side plate assembly 30 respectively, when the side plate assembly 30 is folded, the two assembly shafts 35 can maintain a consistent state relative to the first side plate 31 and the second side plate 32.

[0126] Furthermore, the second groove forming portion 328 of the second side plate 32 has an anti-detachment groove 3282, which is connected to the second assembly groove 325. The top of the assembly shaft 35 has an anti-detachment block 355, which protrudes into the anti-detachment groove 3282 of the second groove forming portion 328. As the second side plate 32 rotates, the anti-detachment block 355 can slide within the anti-detachment groove 3282 of the second groove forming portion 328 to prevent the assembly shaft 35 from falling off the first side plate 31 and the second side plate 32, thus ensuring the reliability of the side plate assembly 30. Preferably, the anti-detachment block 355 of the assembly shaft 35 has a guide slope 3551. When the assembly shaft 35 is assembled into the first assembly groove 315 of the first side plate 31 and the second assembly groove 325 of the second side plate 32, the opening edge of the second assembly groove 325 of the second side plate 32 can abut against the guide slope 3551 of the anti-detachment block 355. Thus, when the assembly shaft 35 is pressed, it is convenient for the assembly shaft 35 to move downward and be assembled into the first side plate 31 and the second side plate 32.

[0127] In the appendix Figures 26 to 50 In this specific example of the trolley of the present invention shown, the side panel lock 34 is mounted on the first side panel 31, and the side panel lock 34 is capable of locking or releasing the second side panel 32. When the side panel lock 34 locks the second side panel 32, the side panel assembly 30 is prevented from folding, and when the side panel lock 34 releases the second side panel 32, the side panel assembly 30 is allowed to fold.

[0128] Specifically, see the attached document. Figure 49The side plate lock 34 includes a lock seat 344, a lock body 345, and a return spring 346. The lock body 345 is pressably mounted on the lock seat 344. The opposite ends of the return spring 346 abut against the lock seat 344 and the lock body 345, respectively. The inner side of the lock body 345 has a lock hook 3451. The lock seat 344 is mounted on the first side plate 31 to mount the side plate lock 34 on the first side plate 31. For example, bolts can be used to mount the lock seat 344 on the first side plate 31. The second side plate 32 has a protrusion 3210, which has a recessed groove 32101 and a hook slit 32102 extending upward from the recessed groove 32101. After the side panel assembly 30 is unfolded, the locking hook 3451 of the lock body 345 protrudes into the recessed groove 32101 of the protrusion 3210 of the second side panel 32. The restoring force provided by the return spring 346 can push the lock body 345 upward, causing the locking hook 3451 to hook into the hook slot 32102 of the protrusion 3210 of the second side panel 32. In this way, the side panel lock 34 locks the first side panel 31 and the second side panel 32, preventing the side panel assembly 30 from folding automatically. It can be understood that when unlocking is required, pressing down on the lock body 345 will disengage the locking hook 3451 from the hook slot 32102 of the protrusion 3210 of the second side panel 32, at which point the side panel assembly 30 can be folded.

[0129] Furthermore, the lock seat 344 has a groove 3441, two upward-opening first retaining grooves 3442, an upward-opening second retaining groove 3443, and two blocking arms 3444. The two first retaining grooves 3442 are respectively located on opposite sides above the groove 3441, and the second retaining groove 3443 is located on the front side of the groove 3441. The two blocking arms 3444 protrude into the second retaining groove 3443 on opposite sides at the top opening of the second retaining groove 3443 to reduce the size of the top opening of the second retaining groove 3443. The lock body 345 has an insertion post 3452, a first retaining arm 3453, a second retaining arm 3454, and two blocking arms 3455. The two blocking arms 3455 extend outward from opposite sides of the second retaining arm 3454. The insertion post 3452, the first retaining arm 3453, and the second retaining arm 3454 of the lock body 345 are respectively inserted into the seat groove 3441, the first retaining groove 3442, and the second retaining groove 3443 of the lock seat 344. The two obstructed arms 3455 of the lock body 345 are respectively blocked by the two blocking arms 3444 of the lock seat 344, so as to prevent the lock body 345 from falling off the lock seat 344.

[0130] Preferably, the lock seat 344 has a retaining post 3445 located in the seat groove 3441, the insertion post 3452 of the lock body 345 has a post groove 34521, the retaining post 3445 of the lock seat 344 protrudes into the post groove 34521 of the insertion post 3452 of the lock body 345, the bottom of the return spring 346 receives the retaining post 3445 of the lock seat 344, and the top is located in the post groove 34521 of the insertion post 3452 of the lock body 345, so as to hide the return spring 346 between the lock seat 344 and the lock body 345.

[0131] Preferably, the lock seat 344 has an assembly arm 3446, which can be bolted to the first side plate 31 to install the side plate lock 34 to the first side plate 31.

[0132] Appendix Figures 46 to 50The assembly process of the side panel assembly 30 is illustrated. First, the first side panel 31 and the second side panel 32 are arranged back-to-back, with the outer sides of the first side panel 31 and the second side panel 32 abutting against each other. The positions of the first mounting groove 315 of the first side panel 31 and the second mounting groove 325 of the second side panel 32 correspond in the height direction. Next, the bottom of the assembly shaft 35 is sequentially inserted into one second mounting groove 325 of the second side panel 32, the first mounting groove 315 of the first side panel 31, and the other second mounting groove 325 of the second side panel 32, with the opening edge of the second mounting groove 325 of the second side panel 32 abutting against the guide slope 3551 of the anti-detachment block 355. Third, pressure is applied to the assembly shaft 35, and by means of the elasticity of the second side plate 32 and / or the assembly shaft 35 itself (for example, the second side plate 32 and / or the assembly shaft 35 may be made of plastic, so that the second side plate 32 and / or the assembly shaft 35 may be slightly deformable), the anti-detachment block 355 of the assembly shaft 35 slides into the anti-detachment groove 3282 of the second groove forming portion 328 of the second side plate 32, so that the first side plate 31 and the second side plate 32 are mounted by the assembly shaft 35, wherein the first side plate 31 and the second side plate 32 are allowed to rotate about the center of the assembly shaft 35, so that the side plate assembly 30 can be folded and unfolded. Fourth, after fitting one end of the return spring 346 onto the retaining post 3445 of the lock seat 344 and placing the other end of the return spring 346 into the groove 34521 of the insertion post 3452 of the lock body 345, the lock body 345 is pushed toward the lock seat 344. After the first retaining arm 3453 of the lock body 345 extends into the first retaining groove 3442 of the lock seat 344, the lock body 345 is continued to be pushed toward the lock seat 344. The inherent elasticity of lock seat 344 and lock body 345 (e.g., lock seat 344 and lock body 345 can be made of plastic, allowing for slight deformation) allows the second retaining arm 3454 of lock body 345 to slide into the second retaining groove 3443 of lock seat 344. The respective obstructed arms 3455 of lock body 345 and the respective blocking arms 3444 of lock seat 344 cooperate to prevent lock body 345 from detaching from lock seat 344. Fifth, lock seat 344 is bolted to the first side plate 31, thereby installing side plate lock 34 on the first side plate 31. Through these steps, the side plate assembly 30 is assembled.

[0133] Understandably, in the appendix Figures 26 to 40In the example shown, the side panel assembly 30 is formed by the folding assembly 3000, which includes a first plate 3001, a second plate 3002, and an assembly shaft 35. The assembly shaft 35 is used to assemble one side of the first plate 3001 and one side of the second plate 3002. By allowing the first plate 3001 and the second plate 3002 to rotate about the center of the assembly shaft 35, the folding assembly 3000 can switch between an unfolded state and a folded state. When the folding assembly 3000 is in the unfolded state, the outer sides of the first plate 3001 and the second plate 3002 are flush, making the outer side of the folding assembly 3000 flat. Preferably, when the folding assembly 3000 is in the unfolded state, the inner sides of the first plate 3001 and the second plate 3002 are flush, making the inner side of the folding assembly 3000 flat.

[0134] The specific structure of the first plate 3001 is the same as that of the first side plate 31, and the specific structure of the second plate 3002 is the same as that of the second side plate 32. Therefore, the present invention will not elaborate on the specific structure of the first plate 3001, the specific structure of the second plate 3002, and the connection relationship between the first plate 3001, the second plate 3002, the assembly shaft 35 and the side plate lock 34.

[0135] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A storage device, characterized in that, include: One front panel assembly; A rear panel assembly, wherein the rear panel assembly and the front panel assembly are arranged face to face; Two side panel assemblies, each of the side panel assemblies including a first side panel, a second side panel, and a transition plate, wherein one side of the first side panel and one side of the second side panel are rotatably mounted on opposite sides of the transition plate, wherein in one side panel assembly, the side of the first side panel facing away from the transition plate is rotatably mounted to one side of the rear panel assembly, and the side of the second side panel facing away from the transition plate is rotatably mounted to one side of the front panel assembly; in another side panel assembly, the side of the first side panel facing away from the transition plate is rotatably mounted to the other side of the rear panel assembly, and the side of the second side panel facing away from the transition plate is rotatably mounted to the other side of the front panel assembly; and A base plate assembly, wherein, after the storage device is unfolded, the four edges of the base plate assembly are respectively connected to the bottom of the front plate assembly, the bottom of the rear plate assembly and the bottom of each of the side plate assemblies, thereby forming a storage cavity between the front plate assembly, the rear plate assembly, each of the side plate assemblies and the base plate assembly.

2. The storage device according to claim 1, wherein the base plate assembly comprises two base plate units, the opposite ends of each base plate unit being foldable upwards, one of the opposite ends of the base plate unit being rotatably connected to the bottom of the first side plate of the two side plate assemblies, the folding axis of the base plate unit and the rotation axis of the base plate unit and the first side plate having an acute angle, the opposite ends of the other base plate unit being rotatably connected to the bottom of the second side plate of the two side plate assemblies, the folding axis of the base plate unit and the rotation axis of the base plate unit and the second side plate having an acute angle.

3. The storage device according to claim 2, wherein the base plate unit comprises a triangular base plate main plate and two triangular base plate secondary plates, the base plate main plate having a first main plate short side, a second main plate short side and a main plate long side, the base plate secondary plates having a first secondary plate short side, a second secondary plate short side and a secondary plate long side, the secondary plate long side of one base plate secondary plate and the first main plate short side of the base plate main plate are axially connected to form a folding axis of the base plate unit, the secondary plate long side of another base plate secondary plate and the second main plate short side of the base plate main plate are axially connected to form another folding axis of the base plate unit, the first secondary plate short sides of the two base plate secondary plates of one base plate unit and the bottom of the first side plate of the two side plate assemblies are axially connected to form a rotation axis between the base plate unit and the first side plate, the first secondary plate short sides of the two base plate secondary plates of another base plate unit and the bottom of the second side plate of the two side plate assemblies are axially connected to form a rotation axis between the base plate unit and the second side plate.

4. The storage device according to claim 1, wherein the adapter plate has a first groove and a second groove on opposite sides, the adapter plate has at least a pair of first pivot arms in the first groove and at least a pair of second pivot arms in the second groove, a first pivot cavity is formed between the pair of first pivot arms, and each pair of first pivot arms has a first mounting hole communicating with the first pivot cavity, a second pivot cavity is formed between the pair of second pivot arms, and each pair of second pivot arms has a second mounting hole communicating with the second pivot cavity, wherein the first side plate has a first protruding arm and at least one first pivot shaft disposed on the first protruding arm, the first side plate having at least one first pivot shaft disposed on the first protruding arm, the first side plate having at least one first pivot shaft disposed on the first protruding arm, the first side plate having at least one first pivot arm disposed on the first protruding arm, the first pivot arm having at least one first pivot shaft disposed on the first protruding arm, the first pivot arm having at least one first pivot shaft disposed on the first protruding arm, the first pivot shaft ... The first convex arm protrudes into the first groove of the adapter plate, the first pivot shaft is located in the first pivot cavity and the opposite ends of the first pivot shaft extend into the first mounting holes of a pair of first pivot arms, so that the first side plate is rotatably mounted on the adapter plate, wherein the second side plate has a second convex arm and at least one second pivot shaft disposed in the second convex arm, the second convex arm of the second side plate protrudes into the second groove of the adapter plate, the second pivot shaft is located in the second pivot cavity and the opposite ends of the second pivot shaft extend into the second mounting holes of a pair of second pivot arms, so that the second side plate is rotatably mounted on the adapter plate.

5. The storage device according to claim 4, wherein the adapter plate is provided with at least one first rib in the first groove and at least one second rib in the second groove, the first side plate has at least one first abutting arm disposed on the first rib, the second side plate has at least one second abutting arm disposed on the second rib, and after the side plate assembly is unfolded, the first abutting arm of the first side plate abuts against the first rib of the adapter plate, and the second abutting arm of the second side plate abuts against the second rib of the adapter plate.

6. The storage device according to claim 5, wherein the first abutting arm of the first side plate is disposed in the space between the two first pivot shafts, and the second abutting arm of the second side plate is disposed in the space between the two second pivot shafts.

7. The storage device according to any one of claims 1 to 6, wherein the rear panel assembly has a cavity, the storage device has a cover plate having a pivot side and a free side relative to the pivot side, the pivot side of the cover plate being slidably mounted to the rear panel assembly, the cover plate being received in the cavity of the rear panel assembly when the pivot side of the cover plate slides to the bottom of the cavity of the rear panel assembly, and the cover plate being able to be flipped to close the opening of the storage cavity when the pivot side of the cover plate slides to the top of the cavity of the rear panel assembly.

8. The storage device according to claim 7, wherein the storage device includes a locking assembly disposed on the top of the front panel assembly, the cover plate having at least one elastic arm on the pivot side, wherein when the cover plate closes the opening of the storage cavity, the locking assembly locks the free side of the cover plate, the upper part of the end of the elastic arm is blocked by the top edge of the cavity of the rear panel assembly and the elastic arm is in a deformed state, and after the locking assembly releases the free side of the cover plate, the elastic arm causes the free side of the cover plate to tilt upwards during the process of returning to the initial state.

9. The storage device according to claim 8, wherein the top of the front panel assembly has a mounting groove with an outer opening and a locking hook hole extending from the mounting groove to the inner side of the front panel assembly, the locking assembly includes a lock body and a compression spring, the lock body includes a lock block and a locking hook integrally extending from the lock block, the lock block is pressably mounted in the mounting groove of the front panel assembly, the locking hook extends through the locking hook hole to the inner side of the front panel assembly, the opposite ends of the compression spring abut against the lock block and the front panel assembly respectively, and a hook is provided on the free side of the cover plate, wherein when the cover plate closes the opening of the storage cavity, the locking hook of the lock body hooks the hook of the cover plate to keep the cover plate in the position of closing the opening of the storage cavity.

10. The storage device according to claim 8, wherein the cover plate has a plurality of elastic arms, which are spaced apart from each other on the pivot side along the width direction of the cover plate.

11. The storage device according to claim 7, wherein the storage device includes a locking assembly disposed on the free side of the cover plate, the cover plate having at least one elastic arm on the pivot side, wherein when the cover plate closes the opening of the storage cavity, the locking assembly locks the top of the front panel assembly, the upper part of the end of the elastic arm is blocked by the top edge of the cavity of the rear panel assembly and the elastic arm is in a deformed state, and after the locking assembly releases the top of the front panel assembly, the elastic arm causes the free side of the cover plate to tilt upwards during the process of returning to its initial state.

12. The storage device of claim 11, wherein the free side of the cover plate has a mounting groove and a locking hook hole communicating with the mounting groove, the lock assembly includes a lock body and a compression spring, the lock body includes a slider and a locking protrusion integrally extending from the slider, the slider is slidably mounted in the mounting groove of the cover plate, the locking protrusion extends through the locking hook hole to a position protruding from the free side of the cover plate, the opposite ends of the compression spring abut against the lock block and the cover plate respectively, the front plate assembly has a locking groove, the locking protrusion of the lock body extends into the locking groove of the front plate assembly when the cover plate closes the opening of the receiving cavity, and the lock assembly releases the top of the front plate assembly when the locking protrusion of the lock body exits the locking groove of the front plate assembly.

13. The storage device according to claim 12, wherein the slider has a lever groove, the locking assembly further includes a locking plate, the middle portions of opposite sides of the locking plate are rotatably mounted to the inner wall of the cover plate for forming the mounting groove, a lever is provided at one end of the locking plate near the free side of the cover plate, the lever extends into the lever groove of the slider, and the lever abuts against the inner wall of the slider for forming the lever groove, wherein when the locking plate rotates relative to the cover plate, the lever of the locking plate drives the slider to slide relative to the cover plate.

14. The storage device according to claim 13, wherein the lock assembly further comprises a bottom cover, the bottom cover being mounted on the cover plate for closing the bottom opening of the mounting groove of the cover plate to form the bottom of the mounting groove.

15. The storage device according to claim 14, wherein the cover plate is provided with at least one slot at one end of the mounting groove and at least one hook slot at the other end, the bottom cover is provided with at least one locking arm at one end and at least one hook arm at the other end, the locking arm of the bottom cover engages with the slot of the cover plate, and the hook arm of the bottom cover passes through the hook slot of the cover plate and hooks the cover plate.

16. The storage device according to any one of claims 1 to 6, wherein the top of the adapter plate has a groove, the top of one side of the first side plate has a first protrusion having a first recessed groove and a first hook extending upward from the first recessed groove, the top of one side of the second side plate has a second protrusion having a second recessed groove and a second hook extending upward from the second recessed groove, the side plate assembly further includes a side plate lock, the side plate lock having a slider on its outer side and an upper hook and a lower hook on its inner side, the slider of the side plate lock being slidably mounted up and down in the groove of the adapter plate, and after the storage device is unfolded, the upper hook of the side plate lock... The square hook protrudes into the first recessed groove of the first protrusion of the first side plate, and the lower hook protrudes into the second recessed groove of the second protrusion of the second side plate. When the side plate lock is pulled upward, the upper hook hooks into the first hook slot of the first protrusion of the first side plate, and the lower hook hooks into the second hook slot of the second protrusion of the second side plate, so that the side plate lock locks the first side plate, the second side plate, and the adapter plate. When the side plate lock is pressed downward, the upper hook disengages from the first hook slot of the first protrusion of the first side plate, and the lower hook disengages from the second hook slot of the second protrusion of the second side plate, and the side plate lock releases the first side plate and the second side plate.

17. A storage device, characterized in that, include: One base plate assembly; One front panel assembly; A rear panel assembly, wherein the rear panel assembly and the front panel assembly are arranged face to face, and the rear panel assembly has a plate cavity; Two side panel assemblies, wherein opposite sides of one side panel assembly are respectively connected to one side of the front panel assembly and one side of the rear panel assembly, and opposite sides of the other side panel assembly are respectively connected to the other side of the front panel assembly and the other side of the rear panel assembly, wherein the four edges of the bottom panel assembly are respectively connected to the bottom of the bottom panel assembly, the bottom of the rear panel assembly, and the bottom of each of the side panel assemblies, thereby forming a storage cavity between the front panel assembly, the rear panel assembly, each of the side panel assemblies, and the bottom panel assembly; and A cover plate having a pivot side and a free side relative to the pivot side, the cover plate having at least one resilient arm on the pivot side, the pivot side of the cover plate being slidably mounted to a rear panel assembly, the cover plate being received in the rear panel assembly cavity when the pivot side of the cover plate slides to the bottom of the cavity of the rear panel assembly, the cover plate being flipped over and the free side of the cover plate being locked to the top of a front panel assembly when the pivot side of the cover plate slides to the top of the cavity of the rear panel assembly, the resilient arm being in a deformed state and the free side of the cover plate being tilted upwards during the process of returning to the initial state after the locking assembly releases the free side of the cover plate.

18. The storage device of claim 17, wherein the storage device includes a locking assembly disposed on top of the front panel assembly, the locking assembly being capable of locking or releasing the free side of the cover.

19. The storage device of claim 17, wherein the storage device includes a locking assembly disposed on the free side of the cover plate, the locking assembly being capable of locking or releasing the top of the front panel assembly.

20. A cart, characterized in that, include: One lever; A set of wheels; as well as According to any one of claims 1 to 19, the pull rod is mounted on the rear panel assembly, and a wheel is mounted on each of the two pairs of sides of the bottom of the front panel assembly and the opposite sides of the bottom of the rear panel assembly.

21. A folding assembly, characterized in that, The assembly includes a first plate, a second plate, and an assembly shaft. The first plate has a fan-shaped first assembly groove, and the second plate has a fan-shaped second assembly groove. The positions of the first assembly groove of the first plate and the second assembly groove of the second plate correspond in the height direction. The cross-sectional shape of the assembly shaft is an arc-shaped arch. A portion of the assembly shaft is assembled into the first assembly groove of the first plate, and another portion is assembled into the second assembly groove of the second plate. By allowing the first plate and the second plate to rotate around the center of the assembly shaft, the folding assembly can switch between a folded state and an unfolded state. When the folding assembly is in the unfolded state, the outer sides of the first plate and the outer sides of the second plate are flush.

22. The folding assembly of claim 21, wherein the first plate has an arcuate first inner wall and a second inner wall, the first inner wall and the second inner wall facing each other to form a first mounting groove between the first inner wall and the second inner wall, the center of the first inner wall and the center of the second inner wall coinciding; the second plate has an arcuate third inner wall and a fourth inner wall, the third inner wall and the fourth inner wall facing each other to form a second mounting groove between the third inner wall and the fourth inner wall, the center of the third inner wall and the center of the fourth inner wall coinciding; the mounting shaft has a first axial surface and a second axial surface, the first axial surface and the second axial surface back to back and the center of the first axial surface and the center of the second axial surface coinciding; wherein different positions of the first axial surface of the mounting shaft respectively fit with the first inner wall of the first plate and the third inner wall of the second plate, and different positions of the second axial surface of the mounting shaft respectively fit with the second inner wall of the first plate and the fourth inner wall of the second plate.

23. The folding assembly of claim 22, wherein the first plate has a first groove forming portion and a first shaft portion, the first groove forming portion having a semi-cylindrical first groove, the first shaft portion being semi-cylindrical, and the first shaft portion protruding into the first groove forming portion, the first plate forming a fan-shaped first mounting groove between the first groove forming portion and the first shaft portion, the concave surface of the first groove forming portion forming the first inner wall, and the convex surface of the first shaft portion forming the second inner wall, wherein the second plate has a second groove forming portion and a second shaft portion, the second groove forming portion having a semi-cylindrical second groove, and the second shaft portion being semi-cylindrical. The second shaft portion protrudes into the second groove of the second groove forming portion, and the second plate body forms the second assembly groove between the second groove forming portion and the second shaft portion. The concave surface of the second groove forming portion forms the third inner wall, and the convex surface of the second shaft portion forms the fourth inner wall. The first axial surface of the assembly shaft is a convex surface, and the second axial surface is a concave surface. Thus, different positions of the first axial surface of the assembly shaft are respectively attached to the first inner wall of the first plate body and the third inner wall of the second plate body, and different positions of the second axial surface of the assembly shaft are respectively attached to the second inner wall of the first plate body and the fourth inner wall of the second plate body.

24. The folding assembly according to claim 22, wherein the first inner wall of the first plate is provided with a first limiting groove, the third inner wall of the second plate is provided with a second limiting groove, the assembly shaft has a first limiting protrusion and a second limiting protrusion, the first limiting protrusion of the assembly shaft is slidably mounted in the first limiting groove of the first plate, and as the first plate rotates, the first limiting protrusion of the assembly shaft can slide in the first limiting groove of the first inner wall to limit the maximum rotation angle of the first plate; the second limiting protrusion of the assembly shaft is slidably mounted in the second limiting groove of the second plate, and as the second plate rotates, the second limiting protrusion of the assembly shaft can slide in the second limiting groove of the second inner wall to limit the maximum rotation angle of the second plate.

25. The folding assembly according to claim 23, wherein the second groove forming portion of the second plate has an anti-detachment groove, the anti-detachment groove is connected to the second assembly groove, the top of the assembly shaft has an anti-detachment block, the anti-detachment block protrudes into the anti-detachment groove of the second groove forming portion, and the anti-detachment block is slidable within the anti-detachment groove of the second groove forming portion as the second plate rotates.

26. The folding assembly according to any one of claims 21 to 25, wherein the folding assembly further comprises a side panel lock, the side panel lock being mounted on the first panel and capable of locking and releasing the second panel.

27. The folding assembly of claim 26, wherein the side panel lock comprises a lock, a lock body, and a return spring, the lock body being pressably mounted on the lock seat, the opposite ends of the return spring abutting against the lock seat and the lock body respectively, the lock body having a lock hook on its inner side, the lock seat being mounted on the first plate, the second plate having a protrusion having a recessed groove and a hook slit communicating with the recessed groove, wherein after the folding assembly is unfolded, the hook of the lock body protrudes into the recessed groove of the protrusion of the second plate, and the restoring force provided by the return spring pushes the lock body upward to cause the hook to engage with the hook slit of the protrusion.

28. The folding assembly of claim 27, wherein the lock seat has a seat groove, an upward-opening first retaining groove, an upward-opening second retaining groove, and two blocking arms, the first retaining groove being located above the seat groove, the second retaining groove being located in front of the seat groove, and the two blocking arms protruding into the second retaining groove from opposite sides at the top opening of the second retaining groove to reduce the size of the top opening of the second retaining groove, wherein the lock body has an insertion post, a first retaining arm, a second retaining arm, and two blocking arms, the two blocking arms extending outward from opposite sides of the second retaining arm, wherein the insertion post, the first retaining arm, and the second retaining arm of the lock body are respectively inserted into the seat groove, the first retaining groove, and the second retaining groove of the lock seat, and the two blocking arms of the lock body are respectively blocked by the two blocking arms of the lock seat to prevent the lock body from falling off the lock seat.

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