Patent Publication Number: US-11382417-B2

Title: Multi-foldable picnic table

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to Chinese Utility Model Applications CN 202020261533.6 filed Mar. 5, 2020, CN 202020261508.8 filed Mar. 5, 2020, CN 202020502707.3 filed Apr. 8, 2020 and CN 202020513759.0 filed Apr. 9, 2020. The disclosure of each application is incorporated herein for all purposes by reference in its entirety. 
     FIELD OF THE INVENTION 
     The present invention generally relates to tables and, in particular, to multi-foldable picnic tables. 
     BACKGROUND 
     Picnicking and camping become more and more popular these days. However, existing picnic tables are usually too bulky or heavy for people to carry around. While some existing tables can be carried around, they require dissembling and reassembling, and separate folding and unfolding of several parts of the tables. In addition, most exiting picnic tables are not adjustable in height, and do not fully meet the needs of different people. 
     Given the current state of the art, there remains a need for foldable, portable and/or adjustable picnic tables that address the abovementioned issues. 
     The information disclosed in this Background section is provided for an understanding of the general background of the invention and is not an acknowledgement or suggestion that this information forms part of the prior art already known to a person skilled in the art. 
     SUMMARY OF THE INVENTION 
     The present disclosure provides supporting assemblies, supporting frames and picnic tables that are multi-foldable for convenient storage and transportation and/or are adjustable in height to meet the needs of different people. 
     In various exemplary embodiments, the present disclosure provides a picnic table including a table panel, one or more bench panels, and first and second supporting assemblies. Each of the first and second supporting assemblies includes a table support and one or more bench supports. The table support is connected to the table panel and rotatable with respect to the table panel in a first direction. Each bench support in the one or more bench supports is connected to a corresponding bench panel in the one or more bench panels and rotatable with respect to the corresponding bench panel in the first direction. Each bench support in the one or more bench supports is also connected to the table support and rotatable with respect to the table support in a second direction that is different than the first direction. As such, each of the first and second supporting assemblies is foldable to the table and bench panels, and each of the one or more bench panels is foldable to the table panel. 
     In some exemplary embodiments, the picnic table further includes a table frame and one or more bench frames. The table frame is disposed at a lower side of the table panel, and the table support is pivotally connected with the table frame. Each of the one or more bench frames is disposed at a lower side of a corresponding bench panel in the one or more bench panels, and each bench support is pivotally connected with a bench frame in the one or more bench frames. 
     In some exemplary embodiments, corresponding to the first or second supporting assembly, the picnic table further includes a table link having a first end portion pivotally connected with the table frame and a second end portion pivotally connected with the table support of the first or second supporting assembly. When unfolded, the table link helps stabilize the first or second supporting assembly. 
     In some exemplary embodiments, corresponding to each bench support of the first or second supporting assembly, the picnic table further includes a bench link having a first end portion pivotally connected with the bench frame and a second end portion pivotally connected with an upper end portion of the bench support. The bench link allows the bench and table supports of the first or second supporting assembly to rotate together along the first direction when the bench and table supports of the first or second supporting assembly have different lengths. 
     In an exemplary embodiment, the second end portion of the bench link is pivotally connected with the upper end portion of the bench support through a connecting piece. 
     In an exemplary embodiment, when each of the one or more bench panels is folded onto the table panel, the lower side of each bench panel faces the lower side of the table panel. When folded, at least a portion of the first and second supporting assemblies are sandwiched between the table panel and the one or more bench panels. 
     In another exemplary embodiment, when each of the one or more bench panels is folded onto the table panel, an upper side of each bench panel faces an upper side of the table panel. 
     In some exemplary embodiments, the table support includes one or more adjustable supports each having an adjustable length. When unfolded, adjusting collectively the lengths of the one or more adjustable supports of the table supports of the first and second supporting assemblies changes a height of the table panel with respect to the one or more bench panels. 
     In some exemplary embodiments, corresponding to at least one bench panel, each bench support includes an adjustable support having an adjustable length for adjusting a height of the at least one bench panel when unfolded, or for assisting in folding or unfolding of the first or second supporting assembly, or for both. 
     In many exemplary embodiments, each of the first and second supporting assemblies further includes one or more connectors. Each of the one or more connectors pivotally connects a corresponding bench support in the one or more bench supports with the table support such that the corresponding bench support is rotatable with respect to the table support in the second direction. 
     In some exemplary embodiments, the table support includes a first supporting bar and each of the one or more bench supports includes a second supporting bar. The second supporting bar is aligned with the first supporting bar in the first direction when unfolded. Each of the one or more connectors pivotally connects the second supporting support of the corresponding bench support with the first supporting bar of the table support such that the second supporting bar of the corresponding bench support is rotatable with respect to the first supporting bar of the table support in the second direction. 
     In an exemplary embodiment, the first supporting bar of the table support and the second supporting bar of each of the one or more bench supports collectively form a base of the first or second supporting assembly. 
     In some exemplary embodiments, each of the one or more connectors includes at least one connecting piece, a first fastener and a second fastener. The first fastener pivotally connects an end portion of the first supporting bar with the at least one connecting piece. The second fastener pivotally connects an end portion of the second supporting bar with the at least one connecting piece. 
     In an exemplary embodiment, the end portion of the first or second supporting bar includes a coupler fixedly coupled with the first or second supporting bar. 
     In some exemplary embodiments, the at least one connecting piece includes a first connecting piece and a second connecting piece opposing to each other. The first and second connecting pieces form a channel to receive the end portion of the first supporting bar and the end portion of the second supporting bar. 
     In an exemplary embodiment, each of the one or more connectors further includes at least one third connecting piece fixedly connected or integrally formed with the first and second connecting pieces. 
     In an exemplary embodiment, the end portion of the first supporting bar includes a first end surface and the end portion of the second supporting bar includes a second end surface. Each of the first and second end surfaces includes a substantially flat portion and a curved portion. The substantially flat portions of the first and second end surfaces abut each other when unfolded. The curved portions of the first and second end surfaces allow the first and second supporting bars to rotate with respect to the first and second connecting pieces. 
     In some exemplary embodiments, the end portion of one of the first and second supporting bars includes a protrusion, and the end portion of the other of the first and second supporting bars includes a groove to receive the protrusion when unfolded. 
     In an exemplary embodiment, the protrusion includes a knob at a side thereof and the groove includes a recess to receive the knob and a curved or sloped surface adjacent to the recess to guide the knob into the recess. 
     In another exemplary embodiment, the protrusion includes a knob at each of two opposing sides of the protrusion, and the groove includes a recess at each of two opposing sides of the groove to receive the knob and a curved or sloped surface adjacent to the recess at each of the two opposing sides of the groove to guide the knob into the recess. 
     In some exemplary embodiments, the end portion of the first supporting bar includes a first curved side surface and the end portion of the second supporting bar includes a second curved side surface. Each of the one or more connectors includes first and second pins. The first pin is disposed at the at least one connecting piece and operably coupled with the first curved side surface to help guide rotation of the first supporting bar with respect to the at least one connecting piece. The second pin is disposed at the at least one connecting piece and operably coupled with the second curved side surface to help guide rotation of the second supporting bar with respect to the at least one connecting piece. 
     In some exemplary embodiments, each of the first and second curved side surfaces includes first and second indentations. The first indentation is configured to accommodate crosswise at least a portion of the first or second pin when the picnic table is unfolded to help stabilize the table and bench supports. The second indentation is configured to accommodate crosswise at least a portion of the first or second pin when the picnic table is folded. 
     In an exemplary embodiment, each of the first and second curved side surfaces further includes a convex segment between the first and second indentations. 
     In some exemplary embodiments, each of the one or more connectors includes first, second and third couplers. The first coupler is connected with an end portion of one of the first and second supporting bars. The second coupler connected with an end portion of the other one of the first and second supporting bars. The first and second couplers are pivotally connected with each other to allow the first and second supporting bars to rotate with respect to each other along the second direction. The third coupler is pivotally connected with the first coupler and removably connected with the second coupler. 
     In some exemplary embodiments, the second coupler includes a protrusion at a side thereof. The third coupler includes first and second coupling pieces. The first coupling piece of the third coupler is pivotally connected with the first coupler at a first position. The second coupling piece of the third coupler is pivotally connected with the first coupling piece at a second position and removably connected with the protrusion of the second coupler at a third position. 
     In an exemplary embodiment, when unfolded, the first position is located between the second and third positions along a length direction of the first supporting bar and is offset from a line defined by the second and third positions. 
     In an exemplary embodiment, the second coupling piece includes a hook or buckle. 
     In an exemplary embodiment, the first coupler includes one or more first ribs facing the second coupler when unfolded, and the second coupler includes one or more second ribs facing the first coupler when unfolded. The first and second ribs are zigzagged with respect to each other and operably coupled with each other when unfolded to help stabilize the table and bench supports. 
     In various exemplary embodiments, the present disclosure provides a supporting assembly for a picnic table having a table panel and one or more bench panels. The supporting assembly includes a table support, one or more bench supports, and one or more connectors. The table support is configured to be connected to the table panel and rotatable with respect to the table panel in a first direction. Each of the one or more bench supports is configured to be connected to a corresponding bench panel in the one or more bench panels and rotatable with respect to the corresponding bench panel in the first direction. Each of the one or more connectors is configured to pivotally connect a corresponding bench support in the one or more bench supports with the table support such that the corresponding bench support is rotatable with respect to the table support in a second direction that is different than the first direction. As such, the table and bench supports are allowed to fold to the table and bench panels, and each of the one or more bench panels is allowed to fold to the table panel. The table support, bench support and connector can be any one of the table supports, bench supports and connectors disclosed herein. 
     In various exemplary embodiments, the present disclosure provides a supporting frame for a picnic table having a table panel and one or more bench panels. The supporting frame includes one or more supporting assemblies disclosed herein. 
     The supporting assemblies, supporting frames and picnic tables of the present disclosure have other features and advantages that will be apparent from, or are set forth in more detail in, the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of exemplary embodiments of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are incorporated into and constitute a part of this specification, illustrate one or more exemplary embodiments of the present disclosure and, together with the Detailed Description, serve to explain the principles and implementations of exemplary embodiments of the invention. 
         FIG. 1A  is a top perspective view illustrating an exemplary picnic table in an unfolded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1B  is a top perspective view illustrating the exemplary picnic table of  FIG. 1A  with the table panel at a different height in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1C  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A . 
         FIG. 1D  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A  with the table panel at a different height in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1E  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1F  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1G  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A  in a third intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1H  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A  in a fourth intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1I  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 1A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1J  is a top perspective view illustrating the exemplary picnic table of  FIG. 1A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 2  is a perspective view illustrating an exemplary connector in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3A  is a schematic view illustrating a connection in an exemplary supporting assembly in an unfolded state (e.g., oval A in  FIG. 1F ) in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3B  is a schematic view illustrating the connection of  FIG. 3A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3C  is a schematic view illustrating the connection of  FIG. 3A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3D  is a schematic view illustrating the connection of  FIG. 3A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4A  is a top perspective view illustrating an exemplary picnic table in an unfolded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4B  is a top perspective view illustrating the exemplary picnic table of  FIG. 4A  with the table panel at a different height in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4C  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 4A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4D  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 4A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4E  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 4A  in a third intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4F  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 4A  in a fourth intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4G  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 4A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4H  is a top perspective view illustrating the exemplary picnic table of  FIG. 4A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5A  is an enlarged view taken along oval B of  FIG. 4G . 
         FIG. 5B  is a perspective view illustrating an exemplary connector in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5C  is a perspective view illustrating an exemplary component of an exemplary supporting assembly in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5D  is a side view illustrating the exemplary component of  FIG. 5C . 
         FIG. 5E  is a perspective view illustrating another exemplary component of an exemplary supporting assembly in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5F  is a schematic view illustrating a connection in an exemplary supporting assembly in an intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5G  is a schematic view illustrating the connection of  FIG. 3A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6A  is a top perspective view illustrating an exemplary picnic table in an unfolded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6B  is a partially disassembled perspective view illustrating the exemplary picnic table of  FIG. 6A  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6C  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A . 
         FIG. 6D  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  with the table panel at a different height in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6E  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6F  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6G  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  in a third intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6H  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  in a fourth intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6I  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  in a fifth intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6J  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 6A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 7  is an enlarged view taken along oval C of  FIG. 6B . 
         FIG. 8A  is a schematic view illustrating a connection in an exemplary supporting assembly at oval D of  FIG. 6F  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 8B  is a schematic view illustrating a connection in an exemplary supporting assembly at oval E of  FIG. 6G  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 8C  is a schematic view illustrating a connection in an exemplary supporting assembly at oval F of  FIG. 6H  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9A  is a top perspective view illustrating an exemplary picnic table in an unfolded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9B  is a partially disassembled perspective view illustrating the exemplary picnic table of  FIG. 9A  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9C  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A . 
         FIG. 9D  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9E  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9F  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A  in a third intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9G  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A  in a fourth intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9H  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A  in a fifth intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 9I  is a bottom perspective view illustrating the exemplary picnic table of  FIG. 9A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 10A  is a perspective view illustrating a connection in an exemplary supporting assembly in a first state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 10B  is a perspective view illustrating a connection in an exemplary supporting assembly in a second state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 10C  is a perspective view illustrating a connection in an exemplary supporting assembly in a third state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 10D  is a perspective view illustrating a connection in an exemplary supporting assembly in a fourth state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 10E  is a perspective view illustrating a connection in an exemplary supporting assembly in a fifth state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 11  is a perspective view illustrating an exemplary bench support in accordance with exemplary embodiments of the present disclosure. 
     
    
    
     As will be apparent to those of skill in the art, the components illustrated in the figures described above are combinable in any useful number and combination. The figures are intended to be illustrative in nature and are not limiting. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to implementation of exemplary embodiments of the present disclosure as illustrated in the accompanying drawings. The same reference indicators will be used throughout the drawings and the following detailed description to refer to the same or like parts. Those of ordinary skill in the art will understand that the following detailed description is illustrative only and is not intended to be in any way limiting. Other embodiments of the present disclosure will readily suggest themselves to such skilled persons having benefit of this disclosure. 
     In the interest of clarity, not all of the routine features of the implementations described herein are shown and described. It will be appreciated that, in the development of any such actual implementation, numerous implementation-specific decisions are made in order to achieve the developer&#39;s specific goals, such as compliance with application- and business-related constraints, and that these specific goals will vary from one implementation to another and from one developer to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking of engineering for those of ordinary skill in the art having the benefit of this disclosure. 
     Many modifications and variations of the exemplary embodiments set forth in this disclosure can be made without departing from the spirit and scope of the exemplary embodiments, as will be apparent to those skilled in the art. The specific exemplary embodiments described herein are offered by way of example only, and the disclosure is to be limited only by the terms of the appended claims, along with the full scope of equivalents to which such claims are entitled. 
     Embodiments of the present disclosure are described in the context of picnic tables. A picnic table generally includes a table panel, one or more bench panels and a supporting frame to support the table and bench panels. A supporting frame generally includes one or more supporting assemblies, each having a table support rotatably coupled to the table panel and one or more bench supports rotatably coupled to the one or more bench panels. Of each supporting assembly, each bench support is rotatably coupled to the table support. The rotatable connection allows each supporting assembly to fold to the table and bench panels and allow each bench panel to fold to the table panel. As such, when folded, each bench panel is laid on the table panel, either face-to-face or back-to-back with the table panel. In some cases, at least a portion of the supporting assembly is sandwiched between the table and bench panels. Thus, when folded, the picnic table is compact with a generally layered block-like shape, making it easy and convenient for storage and transportation. 
     In some exemplary embodiments, the table support is adjustable in length. As such, the height of the table panel can be adjusted, by adjusting the length of the table support, to meet the needs of various end users. In some exemplary embodiments, each bench support corresponding to a table panel is adjustable in length. As such, the height of the bench panel can be adjusted, by adjusting the length of the bench support, to meet the needs of various end users. In addition, in some cases, the adjustable table or bench support allows the supporting assembly to fold to the table and bench panels. 
     The table and bench panels of the picnic tables disclosed herein can be of various shapes including but not limited to a square shape, a round shape or a rectangular shape, and can be made of various materials including but not limited to metals, plastics and woods. In some exemplary embodiments, the table panel, the bench panel or both are made of plastics by injection molding, blow molding or any other suitable processes. The supporting frame of the present disclosure can be made of various materials including but not limited to metals (e.g., iron, steel, and aluminum) and plastics. 
     Referring now to  FIGS. 1A-1C , there is depicted exemplary picnic table  100  in accordance with some embodiments of the present disclosure. As shown, picnic table  100  includes a table panel such as table panel  110 , and one or more bench panels such as bench panel  120 . By way of example,  FIGS. 1A-1C  illustrate two bench panels. Table panel  110  includes an upper side such as upper side  112  and a lower side such as lower side  114 . Bench panel  120  includes an upper side such as upper side  122  and a lower side such as lower side  124 . 
     Picnic table  100  also includes one or more supporting assemblies such as supporting assembly  130  to support the table and bench panels. By way of example,  FIGS. 1A-1C  illustrate two supporting assemblies, one disposed at a first side and one at a second side of the picnic table when in use. The supporting assemblies can be the same as or different from each other. 
     In some exemplary embodiments, supporting assembly  130  includes a table support such as table support  140  to support the table panel and one or more bench supports such as bench support  150  to support the one or more bench panels. For instance, in the illustrated embodiment, supporting assembly  130  includes two bench supports  150 , each supporting a corresponding bench panel  120 . The supporting assembly of the present disclosure can be made of various materials including but not limited to metals (e.g., iron, steel, and aluminum) and plastics. 
     In some exemplary embodiments, picnic table  100  includes a table frame such as table frame  172  and one or more bench frames such as bench frame  174 . Table frame  172  is disposed at a lower side of table panel  110  and configured to rotatably connect the table support of each supporting assembly  130  with the table panel. Each bench frame  174  is disposed at a lower side of a corresponding bench panel and configured to rotatably connect a respective bench support of each supporting assembly  130  with the corresponding bench panel. The table and bench frames, together with the one or more supporting assemblies and additional or optional components, are collectively referred to herein as a supporting frame. 
     In some exemplary embodiments, picnic table  100  includes one or more table links to assist rotation of the one or more supporting assemblies and/or to support and stabilize the one or more supporting assemblies when unfolded. For instance, in an exemplary embodiment, corresponding to each supporting assembly  130 , picnic table  100  includes a table link such as table link  176 . Table link  176  has a first end portion pivotally connected with the table frame and a second end portion pivotally connected with the table support of the first or second supporting assembly. When unfolded, the table link helps hold and stabilize the supporting assembly. 
     Of each supporting assembly  130 , in some exemplary embodiments, table support  140  is configured to be an adjustable assembly or to include an adjustable assembly for adjusting the length of the table support and thus the height of the table panel. An adjustable assembly generally includes one, two, three or more than three adjustable supports. For instance, as an example,  FIG. 1A  illustrates table support (or adjustable assembly)  140  having two adjustable supports  146  that are spaced apart and substantially parallel to each other. Each adjustable support  146  includes an inner bar such as inner bar  148  and an outer tubular bar such as outer tubular bar  147 . The inner bar can be tubular or non-tubular. The inner and outer bars are telescopically coupled with each other. 
     In some exemplary embodiments, each adjustable support  146  includes a locking/unlocking mechanism configured to control relative movement of the inner and outer bars of the respective adjustable support. Examples of adjustable supports are disclosed in U.S. patent application Ser. No. 15/400,861, Ser. No. 15/931,925 and Ser. No. 17/000,661, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. In some exemplary embodiments, table support  140  includes an adjustment mechanism such as adjustment  149  coupled with the one or more adjustable supports and configured to control relative movement of the inner and outer bars of each of the one or more adjustable supports. Examples of adjustment mechanisms are disclosed in U.S. patent application Ser. Nos. 17/003,047 and Ser. No. 17/038,369, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. 
     When unfolded, one can change the height of the table panel by adjusting collectively the lengths of table supports  140  of the supporting assemblies. In some exemplary embodiments, the height of the table panel is adjustable between a first position at which the table panel is positioned higher than the one or more bench panels and a second position at which the table panel is positioned at a level substantially the same as the one or more bench panels. In an exemplary embodiment, there exists at least one intermediate position between the first and second positions. When the table panel is aligned with the one or more bench panels, the supporting assembly can be folded onto the table and bench panels, thereby making the picnic table compact and convenient for storage and transportation. 
     In some exemplary embodiments, table support  140  is rotatable with respect to table panel  110  along a first direction (e.g., the x-direction in  FIG. 1A  or the lateral direction of the table panel). Similarly, bench support  150  is rotatable with respect to bench panel  120  along the first direction. Although rotatable along the same direction, it should be noted that the rotation axes of the table and bench panels can be coincided with each other or offset from each other. 
     Of each supporting assembly  130 , in some exemplary embodiments, the table and bench panels are connected with each other and rotatable with respect to each other along a second direction (e.g., the y-direction in  FIG. 1A ) that is different than the first direction. In an exemplary embodiment, the second direction is substantially perpendicular to the first direction. In some exemplary embodiments, supporting assembly  130  includes one or more connectors such as connector  160 , each for pivotally connecting one bench support  150  with table support  140  such that the bench support is rotatable with respect to the table support in the second direction. 
     Referring to  FIGS. 1C-1J , there is depicted an exemplary process to fold picnic table  100  in accordance with some embodiments of the present disclosure. First, the table support is adjusted to level the table and bench panels as illustrated in  FIG. 1D . Then each supporting assembly is rotated and folded onto the leveled table and bench panels as illustrated in  FIGS. 1E and 1F . After that, each bench panel is rotated and folded onto the table panel as illustrated in  FIGS. 1G and 1H . The folded picnic table is illustrated in FIGS.  1 I and  1 J, of which  FIG. 1I  is a bottom perspective view and  FIG. 1J  is a top perspective view. The supporting assemblies (at least a portion of them) are sandwiched between the table and bench panels. While rotation illustrated in  FIGS. 1G-1H  results in the lower sides of the table and bench panels facing each other (e.g., back-to-back), it should be noted that a similar structure can be constructed such that when folded the upper sides of the table and bench panels face each other (e.g., face-to-face). In either case, the picnic table is folded into a generally layered block-like structure. As such, when folded, it is compact, and thus easy and convenient for storage and transportation. Reversing the process unfolds the picnic table. 
     Referring to  FIGS. 1A-1C , in some exemplary embodiments, table support  140  includes a first supporting bar such as first supporting bar  141  and bench support  150  includes a second supporting bar such as second supporting bar  151 . First supporting bar  141  and second supporting bar  151  are aligned with each other in the first direction when unfolded (e.g., when bench panel  120  is unfolded from table panel  110 , or when the entire picnic table is unfolded). Connector  160  pivotally connects the second supporting support of the bench support with the first supporting bar of the table support such that the second supporting bar is rotatable with respect to the first supporting bar of the table support in the second direction. 
     In some exemplary embodiments, first supporting bar  141  of the table support and second supporting bar  151  collectively form a base of the first or second supporting assembly. In some exemplary embodiments, one or more pads such as pad  178  are provided at the base. Pad  178  is configured to provide better contact with the ground, thereby helping to stabilize the picnic table when in use. 
     In some exemplary embodiments where the table support includes one or more adjustable supports, each adjustable support has a lower end portion fixedly connected or integrally formed with the first supporting bar. As such, when each of the first and second supporting assemblies is unfolded, adjusting collectively the lengths of the one or more adjustable supports of the table supports changes a height of the table panel with respect to the one or more bench panels. 
     In some exemplary embodiments, bench support  150  further includes a bench leg such as bench leg  153 . The bench leg has a lower end portion fixedly connected or integrally formed with second supporting bar  151 . In an exemplary embodiment, the bench leg is arched in the first direction (e.g., arched outwardly). In an exemplary embodiment, the second supporting bar is a portion of a bench leg. 
     Referring to  FIGS. 2 and 3A-3D , there are depicted connector  160  and the use of the connector to connect the second supporting support of the bench support with the first supporting bar of the table support in accordance with some exemplary embodiments of the present disclosure. Of these figures,  FIG. 3A  illustrates the connection at an unfolded state (e.g., the bench support is unfolded with respect to the table support while the entire picnic table may or may not be unfolded),  FIGS. 3B and 3C  illustrate the connection at two intermediate states, and  FIG. 3D  illustrates the connection at a folded state (e.g., the bench support is folded onto the table support). 
     In some exemplary embodiments, connector  160  includes at least one connecting piece, a first fastener pivotally connecting an end portion of the first supporting bar with the at least one connecting piece, and a second fastener pivotally connecting an end portion of the second supporting bar with the at least one connecting piece. For instance, in the illustrated embodiment, connector  160  including first connecting piece  161 , second connecting piece  162 , first fastener  165  and second fastener  166 . In an exemplary embodiment, the first and second connecting pieces are disposed opposing to each other to form a channel to receive the end portion of the first supporting bar and the end portion of the second supporting bar. First fastener  165  pivotally connects end portion  141   a  of first supporting bar  141  of the table support with the first and second connecting pieces. Second fastener  166  pivotally connects end portion  151   a  of second supporting bar  151  of the bench support with the first and second connecting pieces. In an exemplary embodiment, the first or second fastener is coupled with the first and second connecting pieces through one or more holes such as hole  164  formed at the first and second connecting pieces. 
     First supporting bar  141  of the table support or second supporting bar  151  of the bench support can be a single unitary piece or made of multiple bar segments. In an exemplary embodiment, the end portion of first supporting bar  141  of the table support or second supporting bar  151  of the bench support includes a coupler connected or formed with the first or second supporting bar. The end portion  141   a  of first supporting bar  141  and the end portion  151   a  of second supporting bar  151  can be disposed generally symmetric or asymmetric with respect to each other. In the illustrated embodiment, the end portions of the first and second supporting bars are generally symmetric to each other, with the two pivoting points spaced apart in the first direction. 
     In some exemplary embodiments, connector  160  further includes at least one third connecting piece fixedly connected or integrally formed with the first and second connecting pieces. For instance,  FIG. 2  illustrates two third connecting pieces  163 , each having an end fixedly connected or integrally formed with first connecting piece  161  and another end fixedly connected or integrally formed with second connecting piece  162 . Third connecting piece  163  enhances the strength of the connector. In some cases, third connecting piece  163  serves as a stopper to help preventing first supporting bar  141  of the table support (and thus the table panel) or second supporting bar  151  of the bench support (and thus the bench panel) from rotating beyond its unfolded state as illustrated in  FIG. 3A  and from rotating beyond its folded state as illustrated in  FIG. 3D . 
     In some exemplary embodiments, to assist folding and unfolding of first supporting bar  141  of the table support (and thus the table panel) or second supporting bar  151  of the bench support (and thus the bench panel), the end portion of the first or second supporting bar includes an end surface that is at least partially curved. For instance, in an exemplary embodiment, end portion  141   a  of the first supporting bar includes a first end surface such as first end surface  142 , and end portion  151   a  of the second supporting bar includes a second end surface such as second end surface  152 . Each of the first and second end surfaces includes a substantially flat portion and a curved portion. The flat portions of the first and second end surfaces, as illustrated in  FIG. 3A , abut each other when unfolded and thus help to stabilize the unfolded bench and table supports. The curved portions of the first and second end surfaces, as illustrated in  FIGS. 3B and 3C , make it easy to rotate the first and second supporting bars with respect to each other. 
     Referring now to  FIGS. 4A-4B , there is depicted exemplary picnic table  200  in accordance with some embodiments of the present disclosure. Picnic table  200  is similar to picnic table  100 . For instance, picnic table  200  includes a table panel such as table panel  110 , one or more bench panels such as bench panel  120 , and one or more supporting assemblies such as supporting assembly  230  to support the table and bench panels. Supporting assembly  230  includes a table support such as table support  240  to support the table panel and one or more bench supports such as bench support  250  to support the one or more bench panels. Like table support  140 , in some exemplary embodiments, table support  240  is configured to be an adjustable assembly or to include an adjustable assembly for adjusting the length of the table support and thus the height of the table panel. 
     In some exemplary embodiments, table support  240  is rotatable with respect to table panel  110  along a first direction (e.g., the x-direction in  FIG. 4A  or the lateral direction of the table panel). Similarly, bench support  250  is rotatable with respect to bench panel  120  along the first direction. Like supporting assembly  130 , in some exemplary embodiments, the table and bench panels of supporting assembly  230  are connected with each other and rotatable with respect to each other along a second direction (e.g., the y-direction in  FIG. 4A ) that is different than the first direction. In an exemplary embodiment, the second direction is substantially perpendicular to the first direction. In some exemplary embodiments, supporting assembly  230  includes one or more connectors such as connector  260 , each for pivotally connecting one bench support  250  with table support  240  such that the bench support is rotatable with respect to the table support in the second direction. As such, like picnic table  100 , picnic table  200  is foldable multiple times.  FIGS. 4A-4H  depict an exemplary process for folding and unfolding picnic table  200 . The process is substantially the same as folding and unfolding of picnic table  100 , and thus the detailed description of which is omitted to avoid redundancy. 
     Similar to table support  140 , in some exemplary embodiments, table support  240  includes a first supporting bar such as first supporting bar  241  and bench support  250  includes a second supporting bar such as second supporting bar  251 . First supporting bar  241  and second supporting bar  251  are aligned with each other in the first direction when unfolded (e.g., when bench panel  120  is unfolded from table panel  110 , or when the picnic table is unfolded). Connector  260  pivotally connects the second supporting support of the bench support with the first supporting bar of the table support such that the second supporting bar is rotatable with respect to the first supporting bar of the table support in the second direction. 
     Referring to  FIGS. 5A-5G , there are depicted connector  260  and the use of the connector to connect the second supporting support of the bench support with the first supporting bar of the table support in accordance with some exemplary embodiments of the present disclosure. Of these figures,  FIG. 5A , an enlarged view taken along oval B of FIG.  4 G, illustrates perspectively the connection at a folded state (e.g., the bench support is folded onto the table support),  FIG. 5F  illustrates schematically the connection at an intermediate state, and  FIG. 5G  illustrates schematically the connection at the folded state. 
     Similar to connector  160 , in some exemplary embodiments, connector  260  includes at least one connecting piece, a first fastener pivotally connecting an end portion of the first supporting bar with the at least one connecting piece, and a second fastener pivotally connecting an end portion of the second supporting bar with the at least one connecting piece. For instance, in the illustrated embodiment, connector  260  including first connecting piece  161 , second connecting piece  162 , first fastener  165  and second fastener  166 . In an exemplary embodiment, the first and second connecting pieces are disposed opposing to each other to form a channel to receive the end portion of the first supporting bar and the end portion of the second supporting bar. In some exemplary embodiments, connector  260  further includes at least one third connecting piece fixedly connected or integrally formed with the first and second connecting pieces. For instance,  FIG. 5B  illustrates one third connecting piece  163  having an end fixedly connected or integrally formed with first connecting piece  161  and another end fixedly connected or integrally formed with second connecting piece  162 . 
     First fastener  165  pivotally connects end portion  241   a  of first supporting bar  241  of the table support with the first and second connecting pieces. Second fastener  166  pivotally connects end portion  251   a  of second supporting bar  251  of the bench support with the first and second connecting pieces. First supporting bar  241  of the table support or second supporting bar  251  of the bench support can be a single unitary piece or made of multiple bar segments. In an exemplary embodiment, the end portion of first supporting bar  241  of the table support or second supporting bar  251  of the bench support includes a coupler connected or formed with the first or second supporting bar. The end portion  241   a  of first supporting bar  241  and the end portion  251   a  of second supporting bar  251  can be disposed generally symmetric or asymmetric with respect to each other. 
     In some exemplary embodiments, to help stabilize the table and/or bench supports when unfolded, the end portion of one of the first and second supporting bars includes a protrusion, and the end portion of the other of the first and second supporting bars includes a groove to receive the protrusion when unfolded. For instance, in the illustrated embodiment, end portion  251   a  of second supporting bar  251  includes a protrusion such as protrusion  252  and end portion  241   a  of first supporting bar  241  includes a groove such as groove  242 . When unfolded (e.g., when the first and second supporting bars are aligned with each other), protrusion  252  is inserted into groove  242 , thereby help stabilize the table and/or bench supports when unfolded. It should be noted that this is a non-limiting example. A protrusion can be formed at end portion  241   a  of first supporting bar  241  and a groove can be formed at end portion  251   a  of second supporting bar  251 . 
     In some exemplary embodiments, to further help stabilize the table and/or bench supports when unfolded, the protrusion is formed with one or more knobs on one or more sides of the protrusion, and the groove is formed with one or more recesses to receive the one or more knobs. For instance, in an exemplary embodiment, protrusion  252  includes a knob such as knob  253  at a side of the protrusion and groove  242  includes a recess such as recess  243  on a side of the groove to receive the knob when unfolded. In another exemplary embodiment, protrusion  252  includes a knob such as knob  253  at each side of the protrusion and groove  242  includes a recess such as recess  243  at each side of the groove to receive the knobs when unfolded. The knob and recess can have any suitable configurations including but not limited to circular, oval, and polygonal shapes. In some exemplary embodiments, the groove includes a curved or sloped surface such as surface  244  adjacent to the recess for guiding the knob into the recess. 
     In some exemplary embodiments, to assist folding and unfolding of first supporting bar  241  of the table support (and thus the table panel) or second supporting bar  251  of the bench support (and thus the bench panel), the end portion of the first or second supporting bar includes an end surface that is at least partially curved. For instance, in an exemplary embodiment, end portion  241   a  of the first supporting bar includes a first end surface such as first end surface  245  formed at groove  242 , and end portion  251   a  of the second supporting bar includes a second end surface such as second end surface  254  formed at protrusion  252 . At least a portion of first end surface  245  and second end surface  254  is curved. The curved portions of the first and second end surfaces make it easy to rotate the first and second supporting bars with respect to each other. 
     Referring now to  FIGS. 6A-6B , there is depicted exemplary picnic table  300  in accordance with some embodiments of the present disclosure. Picnic table  300  is similar to picnic table  100 . For instance, picnic table  300  includes a table panel such as table panel  110 , one or more bench panels such as bench panel  120 , and one or more supporting assemblies such as supporting assembly  330  to support the table and bench panels. Supporting assembly  330  includes a table support such as table support  340  to support the table panel and one or more bench supports such as bench support  350  to support the one or more bench panels. Like table support  140 , in some exemplary embodiments, table support  340  is configured to be an adjustable assembly or to include an adjustable assembly for adjusting the length of the table support and thus the height of the table panel. 
     In some exemplary embodiments, table support  340  is rotatable with respect to table panel  110  along a first direction (e.g., the x-direction in  FIG. 6A  or the lateral direction of the table panel). Similarly, bench support  350  is rotatable with respect to bench panel  120  along the first direction. Like supporting assembly  130 , in some exemplary embodiments, the table and bench panels of supporting assembly  330  are connected with each other and rotatable with respect to each other along a second direction (e.g., the y-direction in  FIG. 6A ) that is different than the first direction. In an exemplary embodiment, the second direction is substantially perpendicular to the first direction. In some exemplary embodiments, supporting assembly  330  includes one or more connectors such as connector  360 , each for pivotally connecting one bench support  350  with table support  340  such that the bench support is rotatable with respect to the table support in the second direction. As such, like picnic table  100 , picnic table  300  is foldable multiple times.  FIGS. 6C-6J  depict an exemplary process for folding and unfolding picnic table  300 . The process is substantially the same as folding and unfolding of picnic table  100 , and thus the detailed description of which is omitted to avoid redundancy. 
     Similar to table support  140 , in some exemplary embodiments, table support  340  includes a first supporting bar such as first supporting bar  341  and bench support  350  includes a second supporting bar such as second supporting bar  351 . First supporting bar  341  and second supporting bar  351  are aligned with each other in the first direction when unfolded (e.g., when bench panel  120  is unfolded from table panel  110 , or when the picnic table is unfolded). Connector  360  pivotally connects the second supporting support of the bench support with the first supporting bar of the table support such that the second supporting bar is rotatable with respect to the first supporting bar of the table support in the second direction. 
     Referring to  FIGS. 7 and 8A-8C , there are depicted connector  360  and the use of the connector to connect the second supporting support of the bench support with the first supporting bar of the table support in accordance with some exemplary embodiments of the present disclosure. Of these figures,  FIG. 7 , an enlarged view taken along oval C of  FIG. 6B , illustrates perspectively the connection at an unfolded state (e.g., the first and second supporting bars are aligned with each other),  FIG. 8A  illustrates schematically the connection at the unfolded state,  FIG. 8B  illustrates schematically the connection at an intermediate state, and  FIG. 8C  illustrates schematically the connection at a folded state. 
     Similar to connector  160 , in some exemplary embodiments, connector  360  includes at least one connecting piece, a first fastener pivotally connecting an end portion of the first supporting bar with the at least one connecting piece, and a second fastener pivotally connecting an end portion of the second supporting bar with the at least one connecting piece. For instance, in the illustrated embodiment, connector  360  including first connecting piece  161 , second connecting piece  162 , first fastener  165  and second fastener  166 . In an exemplary embodiment, the first and second connecting pieces are disposed opposing to each other to form a channel to receive the end portion of the first supporting bar and the end portion of the second supporting bar. In some exemplary embodiments, connector  360  further includes at least one third connecting piece fixedly connected or integrally formed with the first and second connecting pieces. For instance,  FIG. 7  illustrates one third connecting piece  163  having an end fixedly connected or integrally formed with first connecting piece  161  and another end fixedly connected or integrally formed with second connecting piece  162 . 
     First fastener  165  pivotally connects end portion  341   a  of first supporting bar  341  of the table support with the first and second connecting pieces. Second fastener  166  pivotally connects end portion  351   a  of second supporting bar  351  of the bench support with the first and second connecting pieces. First supporting bar  341  of the table support or second supporting bar  351  of the bench support can be a single unitary piece or made of multiple bar segments. In an exemplary embodiment, the end portion of first supporting bar  341  of the table support or second supporting bar  351  of the bench support includes a coupler connected or formed with the first or second supporting bar. The end portion  341   a  of first supporting bar  341  and the end portion  351   a  of second supporting bar  351  can be disposed generally symmetric or asymmetric with respect to each other. 
     In some exemplary embodiments, to assist folding and unfolding of first supporting bar  341  of the table support (and thus the table panel) or second supporting bar  351  of the bench support (and thus the bench panel), the end portion of the first or second supporting bar includes a curved side surface and the connector includes a pin operably coupled with the curved side surface to guide the rotation of the first or second supporting bar. For instance, in an exemplary embodiment, end portion  341   a  of the first supporting bar includes a first curved side surface such as first curved side surface  342 , and end portion  351   a  of the second supporting bar includes a second curved side surface such as second curved side surface  352 . Connector  360  includes a first pin such as first pin  361  and a second pin such as second pin  362 . First pin  361  and second pin  362  are disposed at (e.g., fixed coupled or integrally formed with) the first and/or second connecting pieces of connector  360 . First pin  361  is operably coupled with first curved side surface  342  to help guide rotation of the first supporting bar with respect to the first and/or second connecting pieces of connector  360 . Second pin  362  is operably coupled with second curved side surface  352  to help guide rotation of the second supporting bar with respect to the at least one connecting piece. 
     In some exemplary embodiments, to help stabilize the table and/or bench supports, the first curved side surface of the first supporting bar or the second curved side surface of the second supporting bar includes one or more indentations. For instance, in some exemplary embodiments, first curved side surface  342  includes a first indentation such as first indentation  342   a  and a second indentation such as second indentation  342   b . First indentation  342   a  is configured to accommodate crosswise at least a portion of first pin  361  when the picnic table is unfolded and second indentation  342   b  is configured to accommodate crosswise at least a portion of first pin  361  when the picnic table is folded. Similarly, in some exemplary embodiments, second curved side surface  352  includes a first indentation such as first indentation  352   a  and a second indentation such as second indentation  352   b . First indentation  352   a  is configured to accommodate crosswise at least a portion of second pin  362  when the picnic table is unfolded and second indentation  352   b  is configured to accommodate crosswise at least a portion of second pin  362  when the picnic table is folded. 
     In some exemplary embodiments, a convex segment such as convex segment  342   c  is formed between first indentation  342   a  and second indentation  342   b  to further assist rotation of first supporting bar  341  of the table support. In an exemplary embodiment, convex segment  342   c  has a circular profile. Similar, in some exemplary embodiments, a convex segment such as convex segment  352   c  is formed between first indentation  352   a  and second indentation  352   b  to further assist rotation of second supporting bar  351  of the bench support. In an exemplary embodiment, convex segment  352   c  has a circular profile. 
     While the first and second pins in the illustrated embodiments are substantially the same as and symmetric to each other, it should be noted that this is a non-limiting example. The first and second pins can be configured in any suitable shapes, sizes and disposed at any suitable positions. Similarly, while the first and second curved side surfaces in the illustrated embodiments are substantially the same as and symmetric to each other, it should be noted that this is a non-limiting example. The first and second curved side surfaces can be of any suitable configurations (e.g., shapes, sizes) and disposed at any suitable positions. 
     Referring now to  FIGS. 9A-9B , there is depicted exemplary picnic table  400  in accordance with some embodiments of the present disclosure. Picnic table  400  is similar to picnic table  100 . For instance, picnic table  400  includes a table panel such as table panel  110 , one or more bench panels such as bench panel  120 , and one or more supporting assemblies such as supporting assembly  430  to support the table and bench panels. Supporting assembly  430  includes a table support such as table support  440  to support the table panel and one or more bench supports such as bench support  450  to support the one or more bench panels. 
     In some exemplary embodiments, table support  440  is rotatable with respect to table panel  110  along a first direction (e.g., the x-direction in  FIG. 9A  or the lateral direction of the table panel). Similarly, bench support  450  is rotatable with respect to bench panel  120  along the first direction. For instance, referring to  FIGS. 9B and 9D , in some exemplary embodiments, bench support  450  is connected to bench panel  120  through a bench link such as bench link  472 . Bench link  472  has a first end portion pivotally connected with bench frame  174  and a second end portion pivotally connected with an upper end portion of the bench support. In an exemplary embodiment, bench link  472  is connected with the bench support through additional or optional connecting piece such as connecting piece  474  disposed at the upper end portion of the bench support. With bench link  472 , the bench and table supports of the first or second supporting assembly can rotate together along the first direction even when they are at different lengths or heights. 
     Like supporting assembly  130 , in some exemplary embodiments, the table and bench panels of supporting assembly  430  are connected with each other and rotatable with respect to each other along a second direction (e.g., the y-direction in  FIG. 9A ) that is different than the first direction. In an exemplary embodiment, the second direction is substantially perpendicular to the first direction. For instance, in some exemplary embodiments, supporting assembly  430  includes one or more connectors such as connector  460 , each for pivotally connecting one bench support  450  with table support  440  such that the bench support is rotatable with respect to the table support in the second direction. As such, like picnic table  100 , picnic table  400  is foldable multiple times. 
     Referring to  FIGS. 9C-9I , there is depicted an exemplary process for folding and unfolding picnic table  400 . With the presence of bench link  472 , there is no need to level the table and bench panels. Each supporting assembly can rotate along the first direction and fold onto the table and bench panels when they are at different lengths or height. This process is illustrated in  FIGS. 9C and 9D . After each supporting assembly is folded to the table and bench panels, the remaining processes are substantially the same as those of picnic table  100 , and thus the detailed description of which is omitted to avoid redundancy. 
     Similar to table support  140 , in some exemplary embodiments, table support  440  includes a first supporting bar such as first supporting bar  441  and bench support  450  includes a second supporting bar such as second supporting bar  451 . First supporting bar  441  and second supporting bar  451  are aligned with each other in the first direction when unfolded (e.g., when bench panel  120  is unfolded from table panel  110 , or when the picnic table is unfolded). Connector  460  pivotally connects the second supporting support of the bench support with the first supporting bar of the table support such that the second supporting bar is rotatable with respect to the first supporting bar of the table support in the second direction. 
     Referring to  FIGS. 9B and 10A-10E , there are depicted connector  460  and the use of the connector to connect the second supporting support of the bench support with the first supporting bar of the table support in accordance with some exemplary embodiments of the present disclosure. Of these figures,  FIG. 10A  illustrates the connection at an unfolded (e.g., the first and second supporting bars are aligned with each other) and locked state,  FIGS. 10B and 10C  illustrate the connection at the unfolded but unlocked state,  FIG. 10D  illustrates the connection at an intermediate state, and  FIG. 10E  illustrates the connection at a folded state. 
     In some exemplary embodiments, connector  460  includes a plurality of couplers configured to connect the first supporting bar with the second supporting bar and lock the first and second supporting bars in position when unfolded. For instance, in some exemplary embodiments, connector  460  includes a first coupler such as first coupler  461 , a second coupler such as second coupler  462  and a third coupler such as third coupler  463 . The first coupler is connected with an end portion of one of the first and second supporting bars and the second coupler connected with an end portion of the other one of the first and second supporting bars. By way of example,  FIGS. 10A-10E  illustrate first coupler  461  connected with first supporting bar  441  and second coupler  462  connected with second supporting bar  451 . The first and second couplers are pivotally connected with each other, e.g., pivotal axis  468 , thereby allowing the first and second supporting bars to rotate with respect to each other along the second direction. 
     Connector  460  also includes a third coupler such as third coupler  463  pivotally connected with one of the first and second couplers and removably connected with the other of the first and second couplers. By way of example,  FIGS. 10A-10E  illustrate third coupler  463  pivotally connected with first coupler  461  and removably connected with second coupler  462 . When connected with the second coupler, the third coupler locks the first and second couplers and restricts the first and second couplers from rotating with respect to each other. Accordingly, the first and second supporting bars are restricted from rotating with respect to each other at this state, resulting in a more stable picnic table. 
     In some exemplary embodiments, the second coupler includes a protrusion such as protrusion  464  at a side of the second coupler. The third coupler includes a first coupling piece such as first coupling piece  463   a  and a second coupling piece  463   b . First coupling piece  463   a  is pivotally connected with the first coupler at a first position such as first position  465 . Second coupling piece  463   b  is pivotally connected with first coupling piece  463   a  at a second position such as second position  466  and removably connected with protrusion  464  of the second coupler at a third position such as third position  467 . In an exemplary embodiment, second coupling piece  463   b  includes a hook or buckle. In some exemplary embodiments, when unfolded and locked, the first position is located between the second and third positions along a length direction of the first supporting bar and is offset from a line defined by the second and third positions. Such an arrangement of the first, second and third positions ensures the first and second couplers remaining at the locked state once the second coupling piece is engaged with the protrusion of the second coupler. 
     To engage the second coupling piece with the protrusion of the second coupler, the first coupling piece is rotated toward the second coupler and then the first coupling piece is hooked with the protrusion of the second coupler. After that, the first coupling piece is rotated toward the first coupler. Because the first position is located between the second and third positions along a length direction of the first supporting bar and is offset from a line defined by the second and third positions, the first and second coupling pieces will remain in place and thus lock the first and second couplers unless an external force is applied to rotate the first coupling piece. This ensures the structural stability of the bench and table supports and the structural stability of the picnic table. To fold the picnic table, the first coupling piece is rotated toward the second coupler and the second coupling piece is unbuckled from the protrusion. The first and second couplers, and accordingly the first and second supporting bars, are then allowed to rotate with respect to each other. 
     In some exemplary embodiments, each of the first and second couplers includes one or more ribs at the ends that face each other when unfolded to help further stabilize the table and/or bench supports. For instance, in an exemplary embodiment, first coupler  461  includes one or more first ribs  461   a  and second coupler  462  includes one or more second ribs  462   a . First ribs  461   a  and second ribs  462   a  are zigzagged with respect to each other and operably coupled with each other when unfolded. First ribs  461   a  and second ribs  462   a  can have any suitable configurations including but not limited to straight, curved or circular ribs. 
     In some exemplary embodiments, picnic tables of the present disclosure include additional, optional and/or alternative components. For instance, as an example,  FIG. 11  illustrates a bench support such as bench support  550  configured to be adjustable in length. Bench support  550  can be used with any picnic table, whether or not its table support is adjustable, to allow one to adjust the height of a bench panel when unfolded. For instance, bench support  550  can be used in picnic table  100 ,  200 ,  300  or  400  disclosed herein to replace bench support  150 ,  250 ,  350  or  450 . Bench support  550  can also be used in picnic table  100 ,  200 ,  300  or  400  disclosed herein along with bench support  150 ,  250 ,  350  or  450 . For instance, bench support  550  can be used to support one bench panel with bench support  150 ,  250 ,  350  or  450  supporting another bench panel. 
     In an exemplary embodiment, bench support  550  includes an adjustable support similar to adjustable support  146  and having an inner bar such as inner bar  554  and an outer bar such as outer bar  554  telescopically coupled with each other. In an exemplary embodiment, the adjustable support has an end portion pivotally connected with bench frame  174  and another end portion connected with the second supporting bar of a supporting assembly. As such, when each of the first and second supporting assemblies is unfolded, adjusting collectively the lengths of the adjustable supports of the bench supports changes a height of the bench panel with respect to the table panel. 
     To fold a picnic table with an adjustable bench support such as bench support  550 , one can adjust the bench support or the table support (if it is adjustable) or both to level the table and bench panels. Once the table and bench panels are leveled, the subsequent process is substantially the same as folding and unfolding of picnic table  100 , and thus the detailed description of which is omitted to avoid redundancy. 
     The components illustrated in the figures and disclosed herein are combinable in any useful number and combination. For instance, first supporting bar  141 , second supporting bar  142  and connector  160  can be used in picnic table  200 ,  300  or  400  to replace first supporting bar  241 ,  341  or  441 , second supporting bar  242 ,  342  or  442 , and connector  260 ,  360  or  460 . Similarly, first supporting bar  241 , second supporting bar  242  and connector  260  can be used in picnic table  100 ,  300  or  400  to replace first supporting bar  141 ,  341  or  441 , second supporting bar  142 ,  342  or  442 , and connector  160 ,  360  or  460 . First supporting bar  341 , second supporting bar  342  and connector  360  can be used in picnic table  100 ,  200  or  400  to replace first supporting bar  141 ,  241  or  441 , second supporting bar  142 ,  242  or  442 , and connector  160 ,  260  or  460 . First supporting bar  441 , second supporting bar  442  and connector  460  can be used in picnic table  100 ,  200  or  300  to replace first supporting bar  141 ,  241  or  341 , second supporting bar  142 ,  242  or  342 , and connector  160 ,  260  or  360 . 
     The picnic tables of the present disclosures have several advantages. For instance, the picnic table can be folded multiple times into a generally layered block-like structure, with each bench panel is laid on the table panel either face-to-face or back-to-back with the table panel. As such, the picnic table when folded is compact, portable and easy to carry around. When in use, the height of the table panel and/or the height of a bench panel can be adjusted to meet the needs and preferences of various end users. The adjustment is simple and easy with the table and bench supports disclosed herein. Further, with the additional stabilizing features disclosed herein, the picnic table is more stable and reliable. In addition, with the supporting assemblies disclosed herein, folding and unfolding of the picnic tables are smooth and fast. 
     The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the claims. As used in the description of the implementations and the appended claims, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be understood that the terms “top” or “bottom”, “lower” or “upper”, and etc. are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. It will be understood that, although the terms “first,” “second,” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first bar could be termed a second bar, and, similarly, a second bar could be termed a first bar, without changing the meaning of the description, so long as all occurrences of the “first bar” are renamed consistently and all occurrences of the “second bar” are renamed consistently.