Cart

Abstract

One embodiment of the trolley includes: a lower frame; one or more wheels attached to the lower frame below; a plate disposed above the lower frame and configured to support one or more items; an upper frame disposed above the plate and configured to surround the one or more items to form a receiving space for receiving the one or more items; a door configured to be movable relative to the upper frame, thereby enabling the opening or closing of at least a portion of a first side of the receiving space; a plurality of first mesh panels fixed to the upper frame in such a way as to surround the remaining sides of the receiving space other than the first side; and a second mesh panel fixed to the door; wherein the height of the second mesh panel is lower than the height of each of the plurality of first mesh panels.

Description

[Technical Field]

[0001] This invention relates to a handcart. [Previous Technology]

[0002] A trolley is a device used to move one or more items when they are loaded. Trolleys can move one or more items quickly and efficiently, and are therefore used in various spaces. For example, trolleys can be used in shopping malls, logistics warehouses, and other spaces. [Summary of the Invention]

[0003] [Problem to be Solved by the Invention] At least one embodiment of the present invention provides a handcart with a structure that can easily load and stably accommodate more than one item. [Technical Means for Solving the Problem]

[0004] A handcart according to one embodiment of the present invention may include: a lower frame; one or more wheels, etc., attached to the lower frame below; a plate, disposed above the lower frame and configured to support one or more articles; an upper frame, disposed above the plate and configured to surround the one or more articles to form a receiving space for receiving the one or more articles; a door, configured to be movable relative to the upper frame, thereby enabling the opening or closing of at least a portion of a first side of the receiving space; a plurality of first mesh panels, etc., fixed to the upper frame in such a way as to surround the remaining sides of the receiving space other than the first side; and a second mesh panel, fixed to the door; and the height of the second mesh panel is lower than the height of each of the plurality of first mesh panels.

[0005] In one embodiment, the first side and the other side may be perpendicular to the plate.

[0006] In one embodiment, the trolley may further include a hinge structure that allows the plate to be rotatably coupled to the door.

[0007] In one embodiment, the door may be rotated relative to the upper frame so as to be located below or above the plate.

[0008] In one embodiment, the trolley may further include: a first fastening part disposed on the upper frame; and a second fastening part disposed on the door and configured to be coupled to the first fastening part so that the door is fixed to the upper frame.

[0009] In one embodiment, the plate may include one or more first portions and one or more second portions, each of the one or more second portions being shaped for fixing the one or more articles.

[0010] In one embodiment, the aforementioned one or more first portions and the aforementioned one or more second portions may be connected to each other.

[0011] In one embodiment, one or more of the second portions may be surrounded by one or more of the first portions.

[0012] In one embodiment, the door may be fixed parallel to the plate during loading or unloading of one or more items from the plate.

[0013] In one embodiment, the trolley may further include: a braking mechanism that is linked with the one or more wheels and the door; and the one or more wheels are configured to be fixed by the braking mechanism while the receiving space is opened by the door; and to be movable while at least a portion of the receiving space is closed by the door.

[0014] In one embodiment, the brake structure may include: a storage tank for storing fluid; a cylinder connected to the storage tank and containing the fluid; a first piston movable within the cylinder; a shaft coupled to the first piston and the door, thereby linking the first piston with the door; a caliper spaced from the cylinder and containing the fluid; a tube connected at one end to the cylinder and at the other end to the caliper; a second piston movable within the caliper in a manner that moves toward or away from one or more of the wheels; and a brake pad disposed on the second piston; and the brake pad may be configured such that, during the period when the receiving space is opened by the door, it moves by the fluid, thereby contacting one of the one or more wheels; and when at least a portion of the receiving space is closed by the door, it is spaced from one of the one or more wheels.

[0015] In one embodiment, the trolley may further include a limiting member configured such that it is fixed to the door and, during the period when the receiving space is opened by the door, contacts at least one of the more than one wheels in order to limit the rotation of at least one of the more than one wheels.

[0016] In one embodiment, the upper frame may include: a plurality of vertical rods, one end of each of which faces a plurality of corners of the plate and extends from the plate in an upward direction; a plurality of horizontal rods, each of which is connected to the other end of the plurality of vertical rods and extends in a first horizontal direction perpendicular to the upward direction; and a rigid member extending in the upward direction and in a second horizontal direction perpendicular to the first horizontal direction, thereby connecting one pair of vertical rods among the plurality of vertical rods spaced apart from each other in the second horizontal direction.

[0017] In one embodiment, the rigid member may include: a connecting portion, which includes a hole having a cross-sectional area larger than that of each of the plurality of vertical rods and each of the plurality of horizontal rods, and is disposed at one end of the rigid member; the upper frame may include: a fixing portion, which is fixed to the first vertical rod of the pair of vertical rods, and includes a portion having a cross-sectional area larger than that of the hole; and the rigid member may be fixed to the pair of vertical rods when the connecting portion and the fixing portion are engaged with each other; and may move along the pair of vertical rods and the plurality of horizontal rods when the engagement of the connecting portion and the fixing portion is released.

[0018] In one embodiment, at least a portion of the above-mentioned fixing part is elastically deformable.

[0019] In one embodiment, the trolley may further include: an elastic member configured to provide an upward elastic force to the door; and the door may be configured to: open the receiving space by moving in the downward direction; and close at least a portion of the receiving space by moving in the upward direction via the elastic member.

[0020] In one embodiment, the handcart may further include: a fixing member rotatably coupled to one of the plurality of vertical rods of the upper frame extending in the upward direction; and the fixing member is configured to rotate relative to one of the plurality of vertical rods, thereby fixing the position of the door as it overlaps with the door. [Effects of the Invention]

[0021] According to at least one embodiment of the present invention, a handcart can be provided that includes a structure that can easily load and stably accommodate more than one item.

Implementation Method

[0022] The embodiments of the present invention are illustrated for the purpose of explaining the technical concept of the present invention. The scope of the present invention is not limited to the embodiments presented below or the specific description of such embodiments.

[0023] Unless otherwise defined, all technical and scientific terms used in this invention have the meanings commonly understood by one of common knowledge in the art to which this invention pertains. All terms used in this invention are selected for the purpose of more clearly describing the invention and are not selected to limit the scope of the invention.

[0024] The expressions such as "comprising", "possessing", "having" used in this invention should be understood as open-ended terms that may include other embodiments, unless otherwise mentioned in the statements or text containing the corresponding expressions.

[0025] The singular expressions described in this invention may include the meaning of the plural form unless otherwise mentioned, and this also applies to the singular expressions described in the claims.

[0026] The terms "first", "second", etc. used in this invention are used to distinguish the plurality of constituent elements from each other, and do not limit the order or importance of the constituent elements.

[0027] In this invention, when referring to a constituent element being "connected" or "combined" with another constituent element, it should be understood that the aforementioned constituent element can be directly connected or combined with the aforementioned other constituent element, or can be connected or combined with the aforementioned other constituent element through a new other constituent element as a medium.

[0028] The embodiments will be described with reference to the examples shown in the accompanying drawings. In the drawings, the same or corresponding constituent elements are given the same reference numerals. Furthermore, in the following description of the embodiments, repeated descriptions of the same or corresponding constituent elements may be omitted. However, even if descriptions related to constituent elements are omitted, it does not mean that such constituent elements are not included in a certain embodiment.

[0029] FIG1 is a perspective view showing an example of a handcart with its door open and at least a portion of the receiving space in an embodiment; FIG2 is a perspective view showing an example of a handcart with its door closed and at least a portion of the receiving space in an embodiment; FIG3 is a perspective view showing a handcart in an embodiment.

[0030] Referring to Figures 1, 2, and 3, a handcart 100 of one embodiment can be used to transport more than one item p1. For example, an operator can use the handcart 100 in the following manner: moving more than one item p1 with more than one item p1 loaded onto the handcart 100, and then unloading more than one item p1. For example, more than one item p1 can be an egg tray, but is not limited thereto.

[0031] A handcart 100 according to one embodiment may include a lower frame 110, one or more wheels 120, a plate 130, an upper frame 140, a door 150, a plurality of first mesh panels 160, second mesh panels 170, a hinge structure 180 and / or a locking structure 190.

[0032] The lower frame 110 can support the constituent elements of the trolley 100. The lower frame 110 can form the lower part of the trolley 100, and at the same time support the various constituent elements above the lower frame 110. For example, the lower frame 110 can be in the shape of a polyhedron, but is not limited to this.

[0033] One or more wheels 120 are rotatable relative to the ground on which the trolley 100 is located, so that the trolley 100 can move. One or more wheels 120 may be configured (or coupled) below the lower frame 110. For example, one or more wheels 120 may include a plurality of wheels, each of which may be spaced apart from each other below the lower frame 110 so that the trolley 100 can easily maintain balance.

[0034] Plate 130 may be disposed above the lower frame 110. Plate 130 may support more than one item p1. In other words, more than one item p1 may be loaded (or housed) on top of plate 130. For example, when viewed from above, plate 130 may have a polygonal cross-section, but is not limited thereto. Plate 130 may be spaced from the ground where the trolley 100 is located by the sum of the height of the lower frame 110 and the height of each of the more than one wheel 120. The height of a component may represent a distance in the upward direction (e.g., the +z direction), and unless otherwise mentioned, this expression may be used substantially the same way.

[0035] The upper frame 140 may be disposed above the plate 130. The upper frame 140 may surround one or more items p1 by being disposed on the plate 130. For example, the upper frame 140 may be shaped to extend upward from the plate 130 (e.g., in the +z direction), thereby surrounding one or more items p1 located on the plate 130. The upper frame 140 and the plate 130 may together form a receiving space 140a for accommodating one or more items p1. The lower surface of the receiving space 140a may refer to the lowest surface in the space surrounded by the upper frame 140. For example, the lower surface of the receiving space 140a may be formed by the upper surface of the plate 130. The upper surface of the receiving space 140a may refer to the highest surface in the space surrounded by the upper frame 140. A plurality of sides 140a-1, 140a-2 of the receiving space 140a can connect the upper surface and the lower surface of the receiving space 140a. For example, the plurality of sides 140a-1, 140a-2 can be perpendicular to the plate 130. The receiving space 140a can be moved away from the ground where the trolley 100 is located by the lower frame 110. For example, since the plate 130 is positioned above the lower frame 110, the position of the receiving space 140a of the trolley 100 in one embodiment can be raised to the height of the lower frame 110 compared to a trolley including one or more wheels 120 of the same type. As the position of the receiving space 140a is raised, the operator using the trolley 100 can easily load or unload one or more items p1 within the receiving space 140a without excessive bending over.

[0036] The lower frame 110 and the upper frame 140 may be formed by a plurality of vertical rods 101, a plurality of horizontal rods 102 and a plurality of connecting members 103. The plurality of vertical rods 101, the plurality of horizontal rods 102 and the plurality of connecting members 103 may define the periphery of the handcart 100.

[0037] The plurality of vertical rods 101 may be shaped to extend in an upward direction (e.g., the +z direction). Each of the plurality of vertical rods 101 may face a corner of the plate 130. For example, one end of each of the plurality of vertical rods 101 forming the upper frame 140 may face a corner of the upper surface of the plate 130 and extend upward from the plate 130 (e.g., the +z direction). For example, one end of each of the plurality of vertical rods 101 forming the lower frame 110 may face a corner of the lower surface of the plate 130 and extend downward from the plate 130 (e.g., the -z direction).

[0038] A plurality of horizontal bars 102 may extend along a first horizontal direction (e.g., the +y direction) perpendicular to the upward direction (e.g., the +z direction). The plurality of horizontal bars 102 may be coupled to a plurality of vertical bars 101. For example, the plurality of horizontal bars 102 may be coupled to the other end of each of the plurality of vertical bars 101. The other end of each of the plurality of vertical bars 101 may be opposite to one end of each of the plurality of vertical bars 101 facing one of the corners of the plate 130.

[0039] A plurality of connecting members 103 may be located between a plurality of vertical rods 101 and a plurality of horizontal rods 102, thereby engaging (or connecting) the plurality of vertical rods 101 and the plurality of horizontal rods 102. For example, the plurality of connecting members 103 may define the corners of the lower frame 110 and the upper frame 140. For example, the inner diameter of each of the plurality of connecting members 103 may be larger than the outer diameter of each of the plurality of vertical rods 101 and the outer diameter of each of the plurality of horizontal rods 102. Therefore, each of the plurality of vertical rods 101 and each of the plurality of horizontal rods 102 may be engaged with each other by being inserted into each of the plurality of connecting members 103. However, this is not a limitation. In some embodiments, the plurality of connecting members 103 may be omitted from the trolley 100, and the plurality of vertical rods 101 and the plurality of horizontal rods 102 may form the lower frame 110 and the upper frame 140 in an engaged manner.

[0040] The door 150 is configured to be movable relative to the upper frame 140, and to open or close at least a portion of the first side 140a-1 of the receiving space 140a. For example, the door 150 can rotate relative to the upper frame 140 with reference to a second horizontal direction (e.g., the +x direction). For example, the height of the door 150 may be lower than the height of the upper frame 140. However, it is not limited to this.

[0041] A plurality of first mesh panels 160 may restrict one or more items p1 within the receiving space 140a from detaching from the outside of the receiving space 140a. The plurality of first mesh panels 160 may include a plurality of holes smaller than the size of each of the items p1. The plurality of first mesh panels 160 may be fixed to the upper frame 140 in a manner that surrounds the remaining sides 140a-2 of the receiving space 140a, excluding the first side 140a-1 of the receiving space 140a. For example, when the receiving space 140a includes four sides, the plurality of first mesh panels 160 may be fixed to three sides 140a-2, excluding the first side 140a-1, which is at least partially open or closed by the door 150. For example, the plurality of first mesh panels 160 may be shaped perpendicular to the plate 130. The height of the plurality of first mesh panels 160 may be less than the height of the upper frame 140.

[0042] The second mesh panel 170 can prevent one or more items p1 within the receiving space 140a from detaching from the outside of the receiving space 140a. The second mesh panel 170 may include a plurality of holes smaller than the size of each of the items p1. The second mesh panel 170 can be fixed to the door 150. The second mesh panel 170 can rotate together with the door 150 relative to the panel 130 (or the upper frame 140).

[0043] A plurality of first mesh panels 160 surround the remaining sides 140a-2 of the receiving space 140a and are fixed to the upper frame 140. Therefore, whether the receiving space 140a is open or closed can be determined by opening or closing at least a portion of the door 150 (or the second mesh panel 170) of the first side 140a-1 of the receiving space 140a. Therefore, the first side 140a-1 of the receiving space 140a that has been fully opened by the door 150 may refer to the receiving space 140a that has been fully opened by the door 150, and this expression may be used in the same way below unless otherwise mentioned. For example, the first side 140a-1 of the receiving space 140a that has been fully opened by the door 150 may refer to the state in which the door 150 can no longer rotate in the first rotation direction (e.g., the rotation direction centered on the +x axis) of the receiving space 140a that is to be opened; this expression may be used in the same way below unless otherwise mentioned. For example, while the operator fully opens the containment space 140a through the door 150, the operator of the handcart 100 can load one or more items p1 onto the plate 130 or unload such items from the plate 130.

[0044] At least a portion of the first side 140a-1 of the receiving space 140a that has been closed by the door 150 may refer to the receiving space 140a being closed by the door 150, and this expression may be used similarly below unless otherwise mentioned. For example, at least a portion of the first side 140a-1 of the receiving space 140a that has been closed by the door 150 may refer to the state where the door 150 can no longer rotate in the second rotation direction (e.g., the rotation direction centered on the -x axis) of the receiving space 140a to be closed; this expression may be used similarly below unless otherwise mentioned. For example, when it is not necessary to load or unload more than one item p1 on the trolley 100, the operator may close the receiving space 140a by the door 150. For example, while the receiving space 140a is closed by the door 150, the operator may move the trolley 100 with more than one item p1 loaded on the plate 130.

[0045] The height of the second mesh panel 170 may be lower than the height of each of the plurality of first mesh panels 160. For example, if the height of the second mesh panel 170 is the same as the height of each of the plurality of mesh panels 160, the height of the door 150 is too long, and the operator of the handcart 100 may not be able to easily operate the door 150. Also, if the height of the door 150 is too long, the receiving space 140a is excessively separated from the ground where the handcart 100 is located, and the balance of the handcart 100 may become unstable. On the other hand, in the absence of the second mesh panel 170 or the door 150, more than one item p1 may fall through the first side 140a-1 of the receiving space 140a. One embodiment of the trolley 100 can be provided with a structure by means of a second mesh plate 170 having a height lower than that of the plurality of first mesh plates 160, such that the operator can easily operate the door 150 while also being able to stably transport more than one item p1.

[0046] The hinge structure 180 allows the plate 130 and the door 150 to be rotatably coupled. For example, the hinge structure 180 can be coupled to the lower surface of the plate 130 and the door 150. In this case, the door 150 can rotate relative to the upper frame 140 so as to be located below or above the plate 130. In other words, when the first side 140a-1 of the receiving space 140a is fully open by means of the door 150, the door 150 can be located below the plate 130. In other words, during the loading or unloading of one or more items p1, the door 150 can be located below the plate 130. Also, when at least a portion of the first side 140a-1 of the receiving space 140a is closed by means of the door 150, the door 150 can be located above the plate 130. However, this is not a limitation.

[0047] The locking mechanism 190 can fix the position of the door 150 by connecting the door 150 and the upper frame 140. The locking mechanism 190 may include a first fastening part 191 and a second fastening part 192. The first fastening part 191 may be disposed on the upper frame 140. For example, the first fastening part 191 may be disposed on one of the plurality of vertical rods 101 of the upper frame 140. The second fastening part 192 may be disposed on the door 150. When the second fastening part 192 and the first fastening part 191 are engaged, the door 150 can be fixed to the upper frame 140. With the door 150 fixed to the upper frame 140, at least a portion of the first side 140a-1 of the receiving space 140a can be closed. When the engagement of the first fastening part 191 and the second fastening part 192 is released, the door 150 can rotate relative to the upper frame 140. During the period when the door 150 rotates relative to the upper frame 140 and is separated from the upper frame 140, the first side 140a-1 of the receiving space 140a can be opened.

[0048] FIG4 shows an example of a plate according to an embodiment, and FIG5 is a cross-sectional view showing an example of cutting the plate of FIG4.

[0049] The handcart 100 in Figures 4 and 5 may be the handcart 100 in Figures 1, 2 and 3 with a modified structure of the plate 130, so repeated descriptions will be omitted.

[0050] Referring to Figures 4 and 5, the plate 130 may include one or more first portions 131 and one or more second portions 132. The one or more first portions 131 and the one or more second portions 132 may refer to areas of the plate 130 that define the lower surface of the receiving space 140a. The one or more first portions 131 and the one or more second portions 132 can be arranged in a manner that allows them to be connected to each other.

[0051] One or more second parts 132 may be shaped to secure one or more articles p1. In other words, one or more second parts 132 may include a plurality of securing portions 133 for securing one or more articles p1. The plurality of securing portions 133 may be shaped as a plurality of protrusions or grooves corresponding to the shape of one or more articles p1. For example, when one or more articles p1 are egg trays, the plurality of securing portions 133 may include protrusions and grooves corresponding to the shape of an egg carton. Since one or more second parts 132 are shaped to secure one or more articles p1, the movement of one or more articles p1 can be restricted during the handling of one or more articles p1 by the trolley 100.

[0052] One or more second portions 132 may be at least partially surrounded by one or more first portions 131. For example, one or more first portions 131 may be positioned to include the corners of the plate 130, and one or more second portions 132 may be partially surrounded by one or more first portions 131. On the other hand, although not shown in Figures 4 and 5, one or more first portions 131 may be arranged along the periphery of the plate 130, and one or more second portions 132 may also be completely surrounded by one or more first portions 131. In other words, one or more second portions 132 may be arranged at the central portion of the plate 130. With one or more second portions 132 for fixing one or more articles p1 arranged at the central portion of the plate 130, one or more articles p1 arranged at the central portion of the plate 130 can be transported more stably. For example, with one or more second portions 132 arranged at the central portion of the plate 130, one or more articles p1 arranged at the central portion of the plate 130 can be stably fixed. Therefore, one or more items p1 configured in one or more parts 131 can be stably supported by the following: a plurality of first mesh plates 160 and one or more items p1 fixed by one or more parts 2 132.

[0053] Figure 6 is a cross-sectional view of a portion of the brake structure of a handcart according to an embodiment; Figure 7 is a cross-sectional view of another portion of the brake structure of a handcart according to an embodiment; Figure 8 is a cross-sectional view of a portion of the brake structure of a handcart according to an embodiment; and Figure 9 is a cross-sectional view of another portion of the brake structure of a handcart according to an embodiment.

[0054] The handcart 100 in Figures 6, 7, 8 and 9 may be a handcart 100 with a modified door 150 in Figures 1, 2 and 3, and with an added brake mechanism 200. Therefore, repeated descriptions will be omitted.

[0055] Figures 6 and 7 show the period during which at least a portion of the containment space 140a is closed by means of the door 150, and Figures 8 and 9 show the period during which the containment space 140a is opened by means of the door 150.

[0056] Referring to Figures 6, 7, 8, and 9, when the receiving space 140a is fully open, at least a portion of the door 150 may be fixed parallel to the plate 130. In other words, when loading or unloading one or more articles p1, at least a portion of the door 150 may be fixed parallel to the plate 130. For example, the door 150 may include a parallel portion 151 and an inclined portion 152. When the receiving space 140a is fully open by means of the door 150, the parallel portion 151 may be fixed parallel to the plate 130. When at least a portion of the receiving space 140a is closed by means of the door 150, the parallel portion 151 may be shaped to extend in an upward direction (e.g., the +z direction). The inclined portion 152 may be connected to the parallel portion 151. The inclined portion 152 may be shaped to extend in a direction different from that of the parallel portion 151. For example, while at least a portion of the receiving space 140a is closed by the door 150, the inclined portion 152 may be in a shape that is inclined relative to the parallel portion 151.

[0057] The handcart 100 may further include a braking mechanism 200. The braking mechanism 200 may be linked to one or more wheels 120 and a door 150. In other words, the braking mechanism 200 may change whether one or more wheels 120 can move by moving the door 150. For example, when the receiving space 140a is opened by the door 150, one or more wheels 120 may be fixed by the braking mechanism 200. For another example, when at least a portion of the receiving space 140a is closed by the door 150, one or more wheels 120 may move. When an operator opens the receiving space 140a to load or unload one or more items p1, one or more wheels 120 may be fixed. Also, when an operator closes the receiving space 140a to move the handcart 100, one or more wheels 120 may be made movable. The brake structure 200 will be described below.

[0058] The brake structure 200 may include a support 210, a storage tank 220, a cylinder 230, a first piston 240, a shaft 250, a caliper 260, a tube 270, a second piston 280, and / or a brake pad 290.

[0059] The support portion 210 can support the door 150 by being fixed to the upper frame 140. The door 150 can be rotatably attached to the support portion 210 relative to the support portion 210. For example, the first axis 211 can pass through the door 150 and the support portion 210. The door 150 can rotate relative to the support portion 210 with the first axis 211 as a reference.

[0060] The storage tank 220 may be configured to store fluid for actuating the brake mechanism 200. The storage tank 220 may be fixed to the support 210.

[0061] The cylinder 230 may be connected to the storage tank 220. In other words, the cylinder 230 may be in fluid communication with the storage tank 220. Therefore, fluid may move from the storage tank 220 to the cylinder 230 or from the cylinder 230 to the storage tank 220.

[0062] The first piston 240 is movable within the cylinder 230 relative to the cylinder 230. For example, the first piston 240 is movable within the cylinder 230 in a manner that brings it closer to or away from the tube 270.

[0063] The shaft 250 can be coupled to the first piston 240 and the door 150, thereby enabling the first piston 240 and the door 150 to move together. For example, the second shaft 212 can pass through the door 150 and the shaft 250. The second shaft 212 can move together with the shaft 250. The inner surface of the inclined portion 152 of the door 150 can cover the outer surface of the second shaft 212. As the door 150 rotates, the inner surface of the inclined portion 152 can move the second shaft 212 while in contact with it. As the second shaft 212 moves, the shaft 250 can move.

[0064] The caliper 260 can cover one or more wheels 120. The caliper 260 can be separated from the cylinder 230. The caliper 260 can contain fluid.

[0065] The pipe 270 can transmit the movement of the door 150 to one or more wheels 120 by means of fluid. One end of the pipe 270 can be connected to the cylinder 230 and the other end can be connected to the caliper 260.

[0066] The second piston 280 can move within the caliper 260 by means of fluid pressure, in a manner that brings it closer to or away from one of the more than one wheel 120 121.

[0067] Brake pad 290 may be disposed (or attached) to the second piston 280. Brake pad 290 may move together with the second piston 280 by being disposed on the second piston 280. For example, referring to Figures 6 and 7, when at least a portion of the receiving space 140a is closed by the door 150, brake pad 290 may be separated from one of the more than one wheel 120 121. During the period when at least a portion of the receiving space 140a is closed by the door 150, the parallel portion 151 of the door 150 may be parallel to the upward direction (e.g., the +z direction). As the door 150 rotates about the first axis 211 in a first rotational direction (e.g., a rotational direction centered on the +x axis), the inner surface of the inclined portion 152 covering the second axis 212 may be pressurized to bring the second axis 212 closer to the cylinder 230. The shaft 250 is pressurized by the second shaft 212, and the first piston 240, which is pressurized by the shaft 250, can move in a first horizontal direction (e.g., the +y direction). As the first piston 240 moves in the first horizontal direction (e.g., the +y direction), the pressure obtained by the first piston 240 can be transmitted to the second piston 280 through the fluid in the pipe 270, and the second piston 280 can move in a manner close to one or more of the wheels 120. Referring to Figures 8 and 9, when the receiving space 140a has been fully opened by the door 150, the brake pad 290 can contact one or more of the wheels 120 121. For example, during the period when the receiving space 140a is fully opened by the door 150, the parallel portion 151 of the door 150 can be fixed parallel to the plate 130.

[0068] As the door 150 rotates in a second rotation direction (e.g., a rotation direction centered on the -x axis) with the first shaft 211 as a reference, the inner surface of the inclined portion 152 covering the second shaft 212 can be pressurized to move the second shaft 212 away from the cylinder 230. The second shaft 212 can pressurize the shaft 250, and the first piston 240, which is pressurized by the shaft 250, can move in a direction opposite to the first horizontal direction (e.g., the -y direction). As the first piston 240 moves in a direction opposite to the first horizontal direction (e.g., the -y direction), the pressure obtained by the first piston 240 can be transmitted to the second piston 280 through the fluid in the pipe 270, and the second piston 280 can move away from one or more of the wheels 120 121. Referring again to Figures 6 and 7, when at least a portion of the receiving space 140a has been closed by the door 150, the brake pad 290 can be separated from one of the more than one wheel 120 121.

[0069] FIG10 is a side view of an embodiment of a trolley door closing at least a portion of the receiving space, and FIG11 is a side view of an embodiment of a trolley door opening at least a portion of the receiving space.

[0070] The handcart 100 in Figures 10 and 11 may be a handcart 100 in Figures 1, 2 and 3 with the addition of a limiting member 300, so repeated descriptions will be omitted.

[0071] Referring to Figures 10 and 11, the trolley 100 may further include a limiting member 300. The limiting member 300 may be configured to restrict the rotation of at least one of the wheels 120 while at least a portion of the receiving space 140a is opened via the door 150. For example, the limiting member 300 may be able to move together with the door 150 by being attached to it. The limiting member 300 may be configured to contact at least one of the wheels 120 while at least a portion of the receiving space 140a is opened via the door 150. For example, the limiting member 300 may be configured to restrict the movement of the trolley 100 by being inserted into (or through) at least one of the wheels 120 while at least a portion of the receiving space 140a is opened via the door 150. In this case, the limiting member 300 may be located between the spokes of at least one of the more than one wheel 120. For example, although not shown in Figures 10 and 11, the limiting member 300 may contact at least one of the more than one wheel 120 by covering at least one of the more than one wheel 120.

[0072] The limiting member 300 may include a first extension 310 and a second extension 320. During the period when at least a portion of the receiving space 140a is closed by the door 150, the first extension 310 may be shaped to extend upward from the door 150 (e.g., in the +z direction). The second extension 320 may be connected to the first extension 310. The second extension 320 may be bent relative to the first extension 310. For example, during the period when at least a portion of the receiving space 140a is closed by the door 150, the second extension 320 may extend perpendicularly to the first extension 310 in a direction opposite to the first horizontal direction (e.g., in the -y direction). During the period when at least a portion of the receiving space 140a is closed by the door 150, the second extension 320 may also function as a handle for moving the trolley 100.

[0073] Referring to FIG10, with at least a portion of the receiving space 140a closed by means of the door 150, the door 150 may rotate in a first rotation direction (e.g., a rotation direction centered on the +x axis).

[0074] Referring to FIG11, as the door 150 rotates in a first rotation direction (e.g., a rotation direction centered on the +x axis), the second extension 320 can be inserted into at least one of the more than one wheel 120. With the second extension 320 inserted into at least one of the more than one wheel 120, the movement of the handcart 100 can be restricted. During the restriction of the movement of the handcart 100, the operator can unload or load more than one item p1 from the handcart 100. As the door 150 rotates in a second rotation direction (e.g., a rotation direction centered on the -x axis), the connection between the second extension 320 and at least one of the more than one wheel 120 can be released.

[0075] FIG12 is a perspective view of a handcart according to an embodiment, and FIG13 is a cross-sectional view of an example of cutting the rigid component of the handcart of FIG12.

[0076] The handcart 100 in Figures 12 and 13 may be a handcart 100 with an added rigid member 104 and one or more fixing parts 105 on the handcart 100 in Figures 1, 2 and 3, so repeated descriptions will be omitted.

[0077] Referring to Figures 12 and 13, the handcart 100 may further include a rigid member 104 and one or more fixing parts 105.

[0078] The rigid member 104 can strengthen the rigidity of the upper frame 140. The rigid member 104 can extend in an upward direction (e.g., the +z direction) and in a second horizontal direction (e.g., the +x direction) perpendicular to the first horizontal direction (e.g., the +y direction). The rigid member 104 can connect one pair of vertical bars 101a, 101b of a plurality of vertical bars 101 spaced apart from each other along the second horizontal direction (e.g., the +x direction).

[0079] The rigid member 104 may include one or more connecting portions 104a. Each of the one or more connecting portions 104a may be disposed at both ends of the rigid member 104. For example, the one or more connecting portions 104a may include a first connecting portion corresponding to the first vertical rod 101a of a pair of vertical rods 101a, 101b, and a second connecting portion corresponding to the second vertical rod 101b. Each of the one or more connecting portions 104a may accommodate (or surround) each of the pair of vertical rods 101a, 101b. Each of the one or more connecting portions 104a may include a hole 104b. The cross-sectional area of ​​the hole 104b may be greater than the cross-sectional area of ​​the plurality of vertical rods 101, the cross-sectional area of ​​the plurality of horizontal rods 102, and the cross-sectional area of ​​the plurality of connecting members 103. For example, the diameter of hole 104b may be greater than the outer diameter of each of the plurality of vertical rods 101, the outer diameter of each of the plurality of horizontal rods 102, and the outer diameter of each of the plurality of connecting members 103.

[0080] Each of the more than one fixing portion 105 may be configured to limit the range of movement of the rigid member 104. Each of the more than one fixing portion 105 may be fixed (or configured) to each of a pair of vertical rods 101a, 101b. For example, the more than one fixing portion 105 may include a first fixing portion corresponding to the first vertical rod 101a and a second fixing portion corresponding to the second vertical rod 101b. The more than one fixing portion 105 may include a portion having a cross-sectional area larger than the cross-sectional area of ​​the hole 104b of each of the more than one connecting portion 104a. For example, each of the more than one fixing portion 105 may include an elastic portion 105a and a rigid portion 105b. The elastic portion 105a may be elastically deformable. The elastic portion 105a may have a cross-sectional area that gradually increases in the downward direction (e.g., the -z direction) so that the more than one connecting portion 104a is smoothly fixed to the more than one fixing portion 105. For example, the cross-sectional area of ​​the upper end of the elastic portion 105a (e.g., the +z direction) may be less than or equal to the cross-sectional area of ​​the hole 104b. The rigid portion 105b may be disposed below the elastic portion 105a. The cross-sectional area of ​​the rigid portion 105b may have a larger cross-sectional area than the cross-sectional area of ​​the hole 104b of each of the more than one joint portion 104a.

[0081] When one or more connecting parts 104a are engaged with one or more fixing parts 105, the rigid member 104 can be fixed to a pair of vertical rods 101a, 101b. When the engagement between one or more connecting parts 104a and one or more fixing parts 105 is disengaged, the rigid member 104 can move along the pair of vertical rods 101a, 101b and a plurality of horizontal rods 102. Therefore, during the loading or unloading of one or more items p1 onto or onto the trolley 100, the operator of the trolley 100 can adjust the position of the rigid member 104 for convenience.

[0082] FIG14 is a side view of an embodiment of a trolley door closing at least a portion of the receiving space, and FIG15 is a side view of an embodiment of a trolley door opening at least a portion of the receiving space.

[0083] The handcart 100 in Figures 14 and 15 may be a handcart 100 with a modified door 150 and locking mechanism 190 of the handcart 100 in Figures 1, 2 and 3. Therefore, repeated descriptions will be omitted.

[0084] Referring to Figures 14 and 15, the handcart 100 may include an elastic member 410, a housing 420, a fixing member 430, and a plurality of supporting members 440.

[0085] The elastic member 410 may be configured to provide an upward (e.g., +z direction) elastic force to the door 150. The elastic member 410 may be disposed within the housing 420. For example, the elastic member 410 may be a spring, but is not limited thereto, and may be replaced by various objects that obey Hooke's Law.

[0086] The housing 420 may be disposed below the upper frame 140. The housing 420 may be attached to the lower frame 110 below the plate 130. The housing 420 may accommodate the elastic member 410 and the door 150.

[0087] The fixing member 430 can fix the position of the door 150. The fixing member 430 can be disposed on the upper frame 140. For example, the fixing member 430 can be disposed on one of the plurality of vertical bars 101 of the upper frame 140. The fixing member 430 can rotate with respect to one of the plurality of vertical bars 101. The fixing member 430 can rotate relative to one of the plurality of vertical bars 101, thereby being able to move to a position overlapping with the door 150 or a position not overlapping with the door 150.

[0088] The plurality of support members 440 may be configured to restrict the movement of the fixing member 430 in the upward direction (e.g., +z direction) or the downward direction (e.g., -z direction). The plurality of support members 440 may be disposed on one of the plurality of vertical rods 101 on which the fixing member 430 is disposed. The plurality of support members 440 may be disposed above and below the fixing member 430. In other words, the fixing member 430 may be disposed among the plurality of support members 440.

[0089] Door 150 can open at least a portion of receiving space 140a by moving in a downward direction (e.g., -z direction) and can close at least a portion of receiving space 140a by moving in an upward direction (e.g., +z direction). As a force is applied to door 150 in the downward direction (e.g., -z direction), door 150 can move in the downward direction (e.g., -z direction) and compress elastic member 410. With at least a portion of receiving space 140a open by door 150, fixing member 430 can overlap with door 150 by rotating relative to one of the plurality of vertical rods 101. As fixing member 430 overlaps with door 150, the position of door 150 is fixed, thereby maintaining the state in which at least a portion of receiving space 140a is open by door 150. During the period when the door 150 applies pressure to the fixing member 430 in the upward direction (e.g., the +z direction), the plurality of supporting members 440 can support the fixing member 430 in such a way as to restrict the movement of the fixing member 430 in the upward direction (e.g., the +z direction) or the downward direction (e.g., the -z direction).

[0090] The position of the door 150 can be restored by means of the elastic member 410. The fixing member 430 rotates relative to one of the plurality of vertical rods 101, thereby enabling it to move in a manner that does not overlap with the door 150. When the fixing member 430 does not overlap with the door 150, the door 150 moves in the upward direction (e.g., the +z direction) by means of the elastic member 410, thereby closing at least a portion of the receiving space 140a.

[0091] The technical concept of the present invention has been described above through examples of some embodiments and accompanying drawings. However, it should be understood that various substitutions, modifications, and alterations can be implemented within the scope of the technical concept and scope of the present invention that can be understood by those skilled in the art. Furthermore, such substitutions, modifications, and alterations should be considered to fall within the scope of the appended patent application. [Simplified Explanation of the Diagram]

[0092] Figure 1 is a perspective view showing an example of at least a portion of the open receiving space of a trolley according to an embodiment. Figure 2 is a perspective view showing an example of at least a portion of the closed receiving space of a trolley according to an embodiment. Figure 3 is a perspective view of a trolley according to an embodiment. Figure 4 shows an example of a plate according to an embodiment. Figure 5 is a cross-sectional view showing an example of cutting the plate of Figure 4. Figure 6 is a cross-sectional view showing a portion of the brake mechanism of a trolley according to an embodiment. Figure 7 is a cross-sectional view showing another portion of the brake mechanism of a trolley according to an embodiment. Figure 8 is a cross-sectional view showing a portion of the brake mechanism of a trolley according to an embodiment. Figure 9 is a cross-sectional view showing another portion of the brake mechanism of a trolley according to an embodiment. Figure 10 is a side view showing an example of at least a portion of the closed receiving space of a trolley according to an embodiment. Figure 11 is a side view showing an example of at least a portion of the open receiving space of a trolley according to an embodiment. Figure 12 is a perspective view of a trolley according to an embodiment. Figure 13 is a cross-sectional view showing an example of cutting through the rigid member of the trolley of Figure 12. Figure 14 is a side view showing an example of a trolley door closing at least a portion of the receiving space according to an embodiment. Figure 15 is a side view showing an example of a trolley door opening at least a portion of the receiving space according to an embodiment.

Claims

1. A handcart, comprising: a lower part frame; One or more wheels are attached to the lower part of the aforementioned lower frame; A panel is disposed above the lower frame and configured to support one or more items; an upper frame is disposed above the panel and configured to surround the one or more items to form a receiving space for accommodating the one or more items; a door is configured to be movable relative to the upper frame, thereby enabling the opening or closing of at least a portion of a first side of the receiving space; a plurality of first mesh panels are fixed to the upper frame in such a way as to surround the remaining sides of the receiving space other than the first side; and a second mesh panel is fixed to the door; and the height of the second mesh panel is lower than the height of each of the plurality of first mesh panels.

2. The handcart as claimed in claim 1, wherein the first side and the other sides are perpendicular to the plate.

3. The handcart as claimed in claim 1, further comprising a hinge structure that rotatably connects the aforementioned panel to the aforementioned door.

4. The trolley as claimed in claim 3, wherein the door is rotatable relative to the upper frame so as to be located below or above the plate.

5. The handcart as described in claim 1 further includes: A first fastening part is disposed on the upper frame; and a second fastening part is disposed on the door and configured to be attached to the first fastening part so that the door is fixed to the upper frame.

6. The trolley of claim 1, wherein the board comprises one or more first parts and one or more second parts, each of the one or more second parts being shaped for securing the one or more articles.

7. The handcart as claimed in claim 6, wherein one or more of the aforementioned first parts are connected to one or more of the aforementioned second parts.

8. The handcart as claimed in claim 6, wherein the second part of the above-mentioned one or more is at least partially surrounded by the first part of the above-mentioned one or more.

9. The trolley of claim 1, wherein the door is fixed parallel to the plate during loading or unloading of one or more items from the plate.

10. The handcart as claimed in claim 1, further includes: A braking mechanism is linked to one or more wheels and the door; and the one or more wheels are configured such that they are fixed by the braking mechanism while the receiving space is opened by the door; and can move while at least a portion of the receiving space is closed by the door.

11. The handcart as claimed in claim 10, wherein the aforementioned braking mechanism includes: Storage tank, which stores fluid; A cylinder connected to the storage tank and containing the fluid; a first piston movable within the cylinder; a shaft coupled to the first piston and the door, thereby linking the first piston and the door; a caliper separated from the cylinder and containing the fluid; a tube connected at one end to the cylinder and at the other end to the caliper; a second piston movable within the caliper in a manner that moves toward or away from one or more of the wheels; and a brake pad disposed on the second piston; wherein the brake pad is configured such that: during the period when the receiving space is opened by the door, it moves by the fluid, thereby contacting one or more of the wheels; and during the period when at least a portion of the receiving space is closed by the door, it is separated from one or more of the wheels.

12. The trolley of claim 1 further includes a limiting member configured such that it is fixed to the door and, during the period when the receiving space is opened by means of the door, contacts at least one of the more than one wheels in order to limit the rotation of at least one of the more than one wheels.

13. The trolley as described in claim 1, wherein the aforementioned upper frame includes: A plurality of vertical rods, each having one end facing a plurality of corners of the plate and extending upward from the plate; a plurality of horizontal rods, each connected to the other end of the plurality of vertical rods and extending in a first horizontal direction perpendicular to the upward direction; and a rigid member extending in the upward direction and in a second horizontal direction perpendicular to the first horizontal direction, thereby connecting one pair of vertical rods among the plurality of vertical rods spaced apart along the second horizontal direction.

14. The handcart as claimed in claim 13, wherein the aforementioned rigid member comprises: The connecting portion includes a hole having a cross-sectional area larger than that of each of the plurality of vertical rods and each of the plurality of horizontal rods, and is disposed at one end of the rigid member; the upper frame includes: a fixing portion fixed to the first vertical rod of the pair of vertical rods, and including a portion having a cross-sectional area larger than that of the hole; and the rigid member is as follows: fixed to the pair of vertical rods when the connecting portion and the fixing portion are engaged; and movable along the pair of vertical rods and the plurality of horizontal rods when the engagement of the connecting portion and the fixing portion is disengaged.

15. The handcart of claim 14, wherein at least a portion of the aforementioned fixed part is elastically deformable.

16. The handcart as claimed in claim 1 further includes: An elastic member is configured to provide an upward elastic force to the door; and the door is configured such that: the receiving space is opened by moving downward; and at least a portion of the receiving space is closed by moving upward via the elastic member.

17. The handcart as claimed in claim 16 further includes: A fixing member is rotatably connected to one of the plurality of vertical bars of the upper frame extending in the aforementioned upward direction; and the fixing member is configured such that it rotates relative to one of the plurality of vertical bars, thereby fixing the position of the door as it overlaps with the door.

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