Patent Publication Number: US-11382416-B2

Title: Stress-dispersing structure, frame and table having same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to Chinese Utility Model Applications CN 201922188730.X filed Dec. 9, 2019 and CN 202020502707.3 filed Apr. 8, 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 frames and tables. In particular, the present invention relates to foldable frames and tables with structures to disperse localized stresses. 
     BACKGROUND 
     Foldable tables are more and more popular these days. A typical foldable table usually includes a tabletop and a supporting frame to support the tabletop. However, many existing foldable tables are configured with no or little means to reduce high stresses in some localized areas. The concentrated stresses could cause damages in the structures. As a result, existing foldable tables are often unstable and their lifespan is relatively short. In addition, some existing foldable tables are difficult to fold and unfold, and thus inconvenient to use. 
     Given the current state of the art, there remains a need for supporting assemblies, frames and 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 frames and foldable tables with structures to disperse localized stresses. 
     In various exemplary embodiments, the present disclosure provides a table comprising a tabletop, first and second table leg assemblies, and first and second supporting assemblies. The tabletop has an upper side and a lower side. Each of the first and second table leg assemblies is pivotally coupled with the tabletop and rotatable with respect to the tabletop between a use position and a storage position. The first supporting assembly is pivotally coupled with the tabletop and first table leg assembly, and configured to control rotation of the first supporting assembly with respect to the tabletop. The second supporting assembly is pivotally coupled with the tabletop and second table leg assembly, and configured to control rotation of the second supporting assembly with respect to the tabletop. Each of the first and second supporting assemblies includes first and second supporting members slidably and rotatably coupled with each other, such that sliding and rotating movement between the first and second supporting members of a respective supporting assembly in the first and second supporting assemblies allows a corresponding table leg assembly in the first and second table leg assemblies to rotate with respect to the tabletop between the use and storage positions. 
     In some exemplary embodiments, the tabletop includes a table panel and a table frame. The table frame includes first and second table mounting members disposed at a lower side of the table panel and spaced apart in a first direction. 
     In some exemplary embodiment, the table panel includes first and second panel segments. Each of the first and second table mounting members includes first and second table mounting segments pivotally coupled with each other at their adjacent end portions. The first table mounting segments of the first and second table mounting members are disposed at the first panel segment. The first table leg assembly and first supporting assembly are coupled with the first table mounting segments of the first and second table mounting members. The second table mounting segments of the first and second table mounting members are disposed at the second panel segment. The second table leg assembly and second supporting assembly are coupled with the second table mounting segments of the first and second table mounting members. As such, the table can be folded roughly in half. When folded, the lower sides of the first and panel segments face each other with the first and second table leg assemblies and the first and second supporting assemblies in between. 
     In an exemplary embodiment, the corresponding table leg assembly includes a table leg linking member, first and second legs, and one or more leg links. The table leg linking member has a first end portion pivotally coupled with the first table mounting member and a second end portion pivotally coupled with the second table mounting member. The first and second legs are spaced apart in the first direction, each having an upper end portion fixedly connected with the table leg linking member. Each of the one or more leg links is disposed between the first and second legs and coupled with the first and second legs. The first supporting member of the respective supporting assembly is pivotally connected with a leg link in the one or more leg links of the corresponding table leg assembly. 
     In another exemplary embodiment, the table frame includes a table leg linking member having a first end portion fixedly coupled with the first table mounting member and a second end portion fixedly coupled with the second table mounting member. The corresponding table leg assembly includes first and second legs, and one or more leg links. The first and second legs are spaced apart in the first direction, each having an upper end portion pivotally connected with the table leg linking member. Each of the one or more leg links is disposed between the first and second legs and coupled with the first and second legs. The first supporting member of the respective supporting assembly is pivotally connected with a leg link in the one or more leg links of the corresponding table leg assembly. 
     In some exemplary embodiments, the first and second supporting members are coupled with each other by a controller. For instance, the controller is coupled with the first supporting member and movable along a length direction of the first supporting member, and the second supporting member is pivotally coupled with the controller. 
     In an exemplary embodiment, the controller includes a body configured to sleeve on the first supporting member. 
     In some exemplary embodiments, the controller includes a pin configured to be selectively inserted into a hole formed at the first supporting member, thereby selectively restricting the movement of the controller along the length direction of the first supporting member. 
     In some exemplary embodiment, the first supporting member includes a stopper to prevent complete disengagement of the controller from the first supporting member. 
     In an exemplary embodiment, each of the first and second supporting assemblies includes a third supporting member. The third supporting member has a first end portion pivotally coupled with the first table mounting member and a second end portion pivotally coupled with the second table mounting member. One of the first and second supporting members is pivotally coupled with the corresponding table leg assembly and the other of the first and second supporting members is fixedly coupled with the third supporting member. 
     In another exemplary embodiment, the first supporting member is pivotally coupled with the corresponding table leg assembly. The second supporting member includes first and second bars. The first bar has a first end portion slidably and rotatably coupled with the first supporting member and a second end portion pivotally coupled with the first table mounting member of the table frame. The second bar has a first end portion slidably and rotatably coupled with the first supporting member and a second end portion pivotally coupled with the second table mounting member of the table frame. 
     In some exemplary embodiments, the table further includes one or more benchtops, one or more first bench leg assemblies and one or more second bench leg assemblies. Each of the one or more benchtops has an upper side and a lower side. The one or more first bench leg assemblies are adjacent to the first table leg assembly, and the one or more second bench leg assemblies are adjacent to the second table leg assembly. Each respective bench leg assembly in the first and second bench leg assemblies is pivotally coupled with a corresponding benchtop in the one or more benchtops and rotatable with respect to the corresponding benchtop between a use position and a storage position. 
     In some exemplary embodiments, the one or more first bench leg assemblies are coupled with the first table leg assembly to synchronize rotation of the one or more first bench leg assemblies with respect to the one or more benchtops and rotation of the first table leg assembly with respect to the tabletop. The one or more second bench leg assemblies are coupled with the second table leg assembly to synchronize rotation of the one or more second bench leg assemblies with respect to the one or more benchtops and rotation of the second table leg assembly with respect to the tabletop. 
     In some exemplary embodiments, when unfolded each of the first and second table leg assemblies is adjustable in height. 
     In some exemplary embodiments, each of the one or more benchtops includes a bench panel and a bench frame. The bench frame includes first and second bench mounting members spaced apart in a first direction. Each respective bench leg assembly includes a bench leg linking member having a first end portion pivotally coupled to the first bench mounting member and a second end portion pivotally coupled to the second bench mounting member. 
     In an exemplary embodiment, each of the one or more benchtops further includes a strengthening member disposed between the first and second bench mounting members. 
     In various exemplary embodiments, the present disclosure provides a table including a table panel, a table frame, first and second table leg assemblies, and first and second supporting assemblies. The table frame includes first and second table mounting members disposed at a lower side of the table panel and spaced apart in a first direction. Each of the first and second table leg assemblies is pivotally coupled with the table frame and rotatable with respect to the table panel between a use position and a storage position. Each of the first and second supporting assemblies includes first, second and third supporting members and a controller. The controller is coupled with the first supporting member and movable along a length direction of the first supporting member. The second supporting member is pivotally coupled with the controller. The third supporting member has a first end portion pivotally coupled with the first table mounting member and a second end portion pivotally coupled with the second table mounting member. One of the first and second supporting members is fixedly coupled with the third supporting member and the other of the first and second supporting members is pivotally coupled with a corresponding table leg assembly in the first and second table leg assemblies. As such, movement of the controller along the length direction of the first supporting member allows the corresponding table leg assembly to rotate with respect to the table panel between the use and storage positions. 
     In an exemplary embodiment, the corresponding table leg assembly includes a table leg linking member, first and second legs, and one or more leg links. The table leg linking member has a first end portion pivotally coupled with the first table mounting member and a second end portion pivotally coupled with the second table mounting member. The first and second legs are spaced apart in the first direction, each having an upper end portion fixedly connected with the table leg linking member. Each of the one or more leg links is disposed between the first and second legs and coupled with the first and second legs. The first supporting member of the respective supporting assembly is pivotally connected with a leg link in the one or more leg links of the corresponding table leg assembly. 
     In another exemplary embodiment, the table frame includes a table leg linking member having a first end portion fixedly coupled with the first table mounting member and a second end portion fixedly coupled with the second table mounting member. The corresponding table leg assembly includes first and second legs and one or more leg links. The first and second legs are spaced apart in the first direction, each having an upper end portion pivotally connected with the table leg linking member. Each of the one or more leg links is disposed between the first and second legs and coupled with the first and second legs. The first supporting member of the respective supporting assembly is pivotally connected with a leg link in the one or more leg links of the corresponding table leg assembly. 
     In various exemplary embodiments, the present disclosure provides a table including a table panel, a table frame, first and second table leg assemblies, and first and second supporting assemblies. The table frame includes first and second table mounting members disposed at a lower side of the table panel and spaced apart in a first direction. Each of the first and second table leg assemblies is pivotally coupled with the table frame and rotatable with respect to the table panel between a use position and a storage position. Each of the first and second supporting assemblies includes first and second supporting members and a controller. The first supporting member is pivotally coupled with a corresponding table leg assembly in the first and second table leg assemblies. The controller is coupled with the first supporting member and movable along a length direction of the first supporting member. The second supporting member includes first and second bars. The first bar has a first end portion pivotally coupled with the controller and a second end portion pivotally coupled with the first table mounting member of the table frame. The second bar has a first end portion pivotally coupled with the controller and a second end portion pivotally coupled with the second table mounting member of the table frame. As such, movement of the controller along the length direction of the first supporting member allows the corresponding table leg assembly to rotate with respect to the table panel between the use and storage positions. 
     The supporting assemblies, frames and 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 bottom perspective view illustrating an exemplary foldable table in an unfolded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 1B  is a partially dissembled view illustrating the foldable table of  FIG. 1A  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 2A  is a partially dissembled view illustrating some components of the foldable table of  FIG. 1A  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 2B  is a partially enlarged view of  FIG. 2A . 
         FIG. 3A  is a bottom perspective view illustrating the foldable table of  FIG. 1A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3B  is a bottom perspective view illustrating the foldable table of  FIG. 1A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3C  is a bottom perspective view illustrating the foldable table of  FIG. 1A  in a third intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 3D  is a bottom perspective view illustrating the foldable table of  FIG. 1A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4A  is a perspective view illustrating an exemplary foldable table in an unfolded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 4B  is a partially dissembled view illustrating the foldable table of  FIG. 4A  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5A  is a bottom perspective view illustrating the foldable table of  FIG. 4A  in a first intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5B  is a bottom perspective view illustrating the foldable table of  FIG. 4A  in a second intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5C  is a bottom perspective view illustrating the foldable table of  FIG. 4A  in a third intermediate state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 5D  is a bottom perspective view illustrating the foldable table of  FIG. 4A  in a folded state in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6A  is a top perspective view illustrating an exemplary foldable 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 foldable table of  FIG. 6A  in accordance with exemplary embodiments of the present disclosure. 
         FIG. 6C  is a bottom perspective view illustrating the exemplary foldable table of  FIG. 6A . 
         FIG. 6D  is a bottom perspective view illustrating the exemplary foldable 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 foldable 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 foldable 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 foldable 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 foldable 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 foldable 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 foldable 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. 
     
    
    
     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 foldable tables. A foldable table generally includes a tabletop, and one or more leg assemblies each pivotally coupled with the tabletop and rotatable with respect to the tabletop between a use position and a storage position. The foldable table further includes one or more supporting assemblies each pivotally coupled with the tabletop and a corresponding table leg assembly in the one or more leg assemblies. Each supporting assembly is configured to control rotation of the corresponding table leg assembly with respect to the tabletop, reduce localized stresses of the structure (e.g., table or frame), prevent accidental folding of the corresponding table leg assembly, and/or prevent accidental unfolding of the corresponding table leg assembly. In some exemplary embodiments, a table further includes one or more benchtops, and one or more bench leg assemblies. Each of the one or more bench leg assemblies is pivotally coupled with a corresponding benchtop in the one or more benchtops and rotatable with respect to the corresponding benchtop between a use position and a storage position. 
     A tabletop generally includes a table panel and a table frame disposed at a lower side of the table panel for connecting the table panel with the one or more leg assemblies and the one or more supporting assemblies. Similarly, a benchtop generally includes a bench panel and a bench frame disposed at a lower side of the bench panel for connecting the bench panel with the one or more bench leg assemblies. The table and/or bench panels can be of various shapes including but not limited to a square shape, a round shape or a rectangular shape. The panels can be made of various materials including but not limited to metals, plastics and woods. In some exemplary embodiments, the panels are made of plastics by injection molding, blow molding or any other suitable processes. 
     The table frame, one or more bench frames, one or more table leg assemblies, one or more supporting assemblies, one or more bench leg assemblies, other additional or optional structures, or any combination thereof, are collectively referred to herein as a supporting frame. The supporting frames 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, some components of a supporting frame (e.g., bars) are made of metals or the like while some other components (e.g., couplers, sliders) are made of plastics, rubbers or the like. 
     Referring now to  FIGS. 1A and 1B , there is depicted exemplary foldable table  100  in accordance with some exemplary embodiments of the present disclosure. As shown, foldable table  100  includes a tabletop such as tabletop  110  having upper side  112  and lower side  114 . Tabletop  110  usually includes a table panel such as table panel  116  and a table frame such as table frame  120  disposed at a lower side of the table panel and configured for connecting the table panel with one or more supporting structures such as table leg assemblies or the like. 
     The table frame can be integrally formed or coupled with the lower side of the table panel. For instance, in some exemplary embodiments, table frame  120  includes a first table mounting member such as first table mounting member  122  and a second table mounting member such as second table mounting member  124 . The first and second table mounting members are disposed at the lower side of the table panel and spaced apart generally in a first direction, e.g., the x-direction in  FIG. 1A . In an exemplary embodiment, the first or second table mounting member is a rail, a bar or the like made of a metal. In another exemplary embodiment, at least a portion of the first or second table mounting member is part of the table panel or integrally formed with the table panel. 
     Foldable table  100  also includes one or more table leg assemblies each pivotally coupled with the tabletop and rotatable with respect to the tabletop between a use position and a storage position. For instance, in some exemplary embodiments, foldable table  100  includes first table leg assembly  130   a  and second table leg assembly  130   b . Each of the first and second table leg assemblies is pivotally coupled with the tabletop and rotatable with respect to the tabletop between a use position as illustrated in  FIG. 1A  and a storage position as illustrated in  FIG. 3C . When in the use positions, the first and second table leg assemblies support the tabletop. When in the storage positions, each of the first and second table leg assemblies is folded onto the tabletop. 
     In some exemplary embodiments, the first or second table leg assembly of table  100  includes a table leg linking member such as table leg linking member  132  pivotally connected with the tabletop. In an exemplary embodiment, table leg linking member  132  is a crossbar or the like, having a first end portion pivotally coupled with first table mounting member  122  and a second end portion pivotally coupled with second table mounting member  124 . For instance, the first or second end portion of table leg linking member  132  is inserted into a hole formed at the first or second table mounting member. In an exemplary embodiment, the first or second end portion of table leg linking member  132  has an oval cross section or the like, configured to aid the rotation of the first or second table leg assembly and to stabilize the first or second table leg assembly when in use. Examples of such configurations are disclosed in U.S. patent application Ser. No. 16/838,939, Ser. No. 16/838,944 and Ser. No. 16/838,947, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. 
     In some exemplary embodiments, to assist in portioning table leg linking member  132  and/or to ensure smooth rotation of the table leg assembly, the table panel includes one or more retainers such as first retainer  128 . The one or more retainers are coupled with or formed at the lower side of the table panel. They usually protrude beyond the general lower surface of the table panel to prevent direct contact of the table leg linking member with the general lower surface of the table panel. In an exemplary embodiment, the first retainer is formed with a recess to receive crosswise at least a portion of the table leg linking member. Examples of retainers are disclosed in U.S. patent application Ser. No. 16/839,337, the disclosure of the application is incorporated herein for all purposes by reference in its entirety. 
     The first or second table leg assembly of table  100  also includes one or more legs each having an upper end portion fixedly connected with the table leg linking member. For instance, in some exemplary embodiments, the first or second table leg assembly includes a first leg such as first leg  134  and a second leg such as second leg  136 . The first and second legs are spaced apart in the first direction, each having an upper end portion fixedly connected with the table leg linking member. Each of the first and second legs can have any suitable shapes. In an exemplary embodiment, middle portions of the first and second legs are arched toward each other with a relatively larger distance between the upper portions of the first and second legs or between the lower portions of the first and second legs. The arched first and second legs enhance the stability of the table when in use. 
     In some exemplary embodiments, to further enhance the strength of the first or second table leg assembly, the first and second legs are connected with each other by one or more leg links. For instance, by way of example,  FIGS. 1A and 1B  illustrate two leg links, e.g., first leg link  137  and second leg link  138 , each disposed between the first and second legs and coupled with the first and second legs. 
     Foldable table  100  further includes one or more supporting assemblies configured to control the rotation (e.g., folding and unfolding) of the one or more table leg assemblies with respect to the tabletop, and/or to stabilize the one or more table leg assemblies when in the use positions. For instance, in some exemplary embodiments, foldable table  100  includes a first supporting assembly such as first supporting assembly  150   a  and a second supporting assembly  150   b . The first supporting assembly is pivotally coupled with the tabletop and first table leg assembly and configured to control the rotation of the first table leg assembly with respect to the tabletop. When the table is in use, the first supporting assembly holds the first table leg assembly in its use position and prevents the first table leg assembly from rotating with respect to the tabletop. Similarly, the second supporting assembly is pivotally coupled with the tabletop and second table leg assembly, and configured to control rotation of the second table leg assembly with respect to the tabletop. When the table is in use, the second supporting assembly holds the second table leg assembly in its use position and prevents the second table leg assembly from rotating with respect to the tabletop. 
     In some exemplary embodiments, the first or second supporting assembly includes a first supporting member such as first supporting member  152  and a second supporting member such as second supporting member  154 . The first and second supporting members are slidably and rotatably coupled with each other, for instance, by a controller such as controller  160 . In some exemplary embodiments, the first or second supporting assembly further includes one or more additional or optional members such as third supporting member  156  pivotally connected with the tabletop. For instance, in an exemplary embodiment, third supporting member  156  is a crossbar or the like, having a first end portion pivotally coupled with first table mounting member  122  and a second end portion pivotally coupled with second table mounting member  124 . The third supporting member is disposed at a middle portion of the tabletop. When the table is unfolded, the supporting assembly forms a triangular structure along with the table frame and the corresponding table leg assembly. As such, the supporting assembly (through the third supporting member) disperses the stresses that could otherwise be concentrated at the locations where the table leg assembly is connected with the table frame. Consequently, the supporting assemblies of the present disclosure not only enhance the stability of the table but also reduce the localized stresses and thus prolong the lifespan of the tables. 
     In some exemplary embodiments, to assist in positioning third supporting member  156  and/or to ensure smooth rotation of the supporting assembly, the table panel includes one or more retainers such as second retainers  129 . The second retainers are coupled with or formed at the lower side of the table panel and can have the same configuration (e.g., size or shape) as the first retainers or different configurations. The second retainers usually protrude beyond the general lower surface of the table panel to prevent direct contact of the third supporting member with the general lower surface of the table panel. In an exemplary embodiment, the second retainer is formed with a recess to receive crosswise at least a portion of the third supporting member. 
     The third supporting member can be used to fixedly couple with either the first or second supporting member. By way of example,  FIGS. 1A and 1B  illustrate the second supporting member is fixedly coupled with the third supporting member while the first member is pivotally coupled with first leg link  137  of the corresponding first or second table leg assembly. In an exemplary embodiment, the first member is pivotally coupled with first leg link  137  of the corresponding first or second table leg assembly through a coupler such as coupler  139 . Coupler  139  can include a bracket, a bolt or the like. 
     Referring to  FIGS. 2A and 2B , in some exemplary embodiments, the second supporting member includes one or more supporting bars. For instance, in the illustrated embodiment, the second supporting member includes two supporting bars, one on each side of the controller. Each of these two supporting bars has an end portion pivotally connected with controller  160  by a fastener such as fastener  166  and another end portion fixedly coupled with the third supporting member. 
     In some exemplary embodiments, controller  160  is coupled with the first supporting member and movable along a length direction of the first supporting member. The second supporting member is pivotally coupled with the controller. As such, while the controller moves along the length direction of the first supporting member, the first and second supporting members move toward or away from each other, resulting in shortening or lengthening the total length of the supporting assembly (e.g., the distance between first leg link  137  of the corresponding table leg assembly and third supporting member  156 ). Moreover, while moving toward or away from each other, each of the first and second supporting members also rotates. For instance, the first supporting member rotates around the pivoting axis at which the first supporting member is pivotally connected with the corresponding table leg assembly. The second supporting member rotates around the pivoting axis at which the second supporting member is pivotally connected with the controller. In addition, the second support member rotates with respect to the tabletop through the third supporting member. As such, the first or second supporting assembly allows the corresponding table leg assembly to rotate between the use and storage positions. 
     In some exemplary embodiments, controller  160  is configured to be a slider or to include a slider similar to those disclosed in U.S. patent application Ser. No. 16/838,939, Ser. No. 16/838,944 and Ser. No. 16/838,947, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. For instance, referring to  FIGS. 2A and 2B , in some exemplary embodiments, controller  160  includes a body such as body  161  configured to sleeve on first supporting member  152 . Controller  160  also includes a casing such as casing  162 , a lever (or button) such as lever  163 , a pin such as pin  164  and/or an elastic member such as elastic member  165 . The casing is integrally formed (e.g., by molding) or coupled (e.g., glued or fastened) with a side wall of the body. The lever is pivotally coupled with the casing. The pin is integrally formed or coupled with the level and disposed in the casing with a free end toward the interior of the body. The elastic member is disposed in the casing and has one end abutting the bottom of the casing (e.g., the side wall of the sleeve) and another end abutting the lever. The pin and elastic member are disposed at opposite sides of the pivotal point at which the lever is connected with the casing. Thus, when a hole such as hole  153  of the first supporting member is aligned with the controller, the elastic member pushes the free end of the pin into the hole of the first supporting member, thereby restricting the body from moving along the first supporting member, and accordingly restricting the controller and thus the second supporting member from moving along the first supporting member. Pressing the elastic member side of the lever toward the body will remove the free end of the pin from the hole of the first supporting member, thereby disengaging the body from the first supporting member and thus allowing the controller to move along the first supporting member. 
     In some exemplary embodiments, first supporting member  152  includes a stopper such as stopper  158 . The stopper is disposed at an end portion of the first supporting member that is adjacent to the second support member, and configured to prevent complete disengagement of controller  160  from the first supporting member. For instance, in an exemplary embodiment, the stopper prevents body  161  of the controller from sliding off the first supporting member. 
     Referring back to  FIGS. 1A and 1B , in some exemplary embodiments, table panel  116  includes multiple panel segments such as first panel segment  116   a  and second panel segment  116   b . First table mounting member  122  includes multiple table mounting segments such as first table mounting segment  122   a  and second table mounting segment  122   b  that are pivotally coupled with each other at their adjacent end portions. Similarly, second table mounting member  124  includes multiple table mounting segments that are pivotally coupled with each other at their adjacent end portions. In an exemplary embodiment, the first or second table mounting segment includes a coupling piece such as first coupling piece  126   a  at its proximal end, the second table mounting segment includes a coupling piece such as second coupling piece  126   b  at its proximal end, and a coupling piece such as third coupling piece  127  that pivotally connects the first and second coupling pieces. Examples of pivotally coupling mounting segments and/or coupling pieces are disclosed in U.S. patent application Ser. No. 16/838,939, Ser. No. 16/838,944 and Ser. No. 16/839,337, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. 
     The first table mounting segments of the first and second table mounting members are disposed at (e.g., coupled or formed with) the first panel segment. The second table mounting segments of the first and second table mounting members are disposed at the second panel segment. The first table leg assembly and first supporting assembly are coupled with the first table mounting segments of the first and second table mounting members. The second table leg assembly and second supporting assembly are coupled with the second table mounting segments of the first and second table mounting members. As such, the table can be generally folded in half. 
     Folding and unfolding of table  100  is simple and easy. For instance, the first table leg assembly can be folded toward the first table panel segment and the second table leg assembly can be folded toward the second table panel segment as illustrated in  FIGS. 3A-3C . Once the first and second table leg assemblies are folded, the combination of the first table panel segment, first table leg assembly and other relevant components and the combination of the second table panel segment, second table leg assembly and other relevant components can be folded toward each other. The resulting folded table is illustrated in  FIG. 3D . As shown, when folded, the lower sides of the first and panel segments face each other with the first and second table leg assemblies and the first and second supporting assemblies in between. In addition, the size of the table when folded is roughly half of the unfolded table. Reversing the processes unfolds the table. 
     Referring now to  FIGS. 4A and 4B , there is depicted exemplary picnic table  200  in accordance with some exemplary embodiments of the present disclosure. Picnic table  200  includes a tabletop such as tabletop  210 , one or more benchtops such as benchtop  220 , and one or more leg assemblies such as leg assembly  230  to support the tabletop and one or more benchtops. In some exemplary embodiments, leg assembly  230  includes a table leg assembly such as table leg assembly  240  to support the tabletop and one or more bench leg assemblies such as bench leg assembly  250  to support the one or more benchtops. By way of example,  FIGS. 4A and 4B  illustrate two benchtops and two leg assemblies. The two benchtops can be the same as or different from each other. Similar, the two leg assemblies can be the same as or different from each other. In the illustrated embodiment, leg assembly  230  includes two bench leg assemblies  250 , each supporting a corresponding benchtop  220 . 
     In some exemplary embodiments, tabletop  210  has an upper side and a lower side, and includes a table panel and a table frame. For instance, in an exemplary embodiment, tabletop  210  has upper side  211  and lower side  212 , and includes table panel  213  and table frame  214 . Table frame  214  is integrally formed or coupled with a lower side of table panel  213  for connecting table leg assembly  240  such that table leg assembly  240  is rotatable with respect to table panel  213  or tabletop  210 . In some exemplary embodiments, table frame  214  includes a first table mounting member such as first table mounting member  215  and a second table mounting member such as second table mounting member  216 . The first and second table mounting members are spaced apart generally in a first direction, e.g., the x-direction in  FIG. 4A . As used herein, the term “spaced apart” does not necessarily require the two components be parallel to each other, and does not necessarily require complete physical separation of the two components. 
     Similar to tabletop  210 , in some exemplary embodiments, benchtop  220  has an upper side and a lower side, and includes a bench panel and a bench frame. For instance, in an exemplary embodiment, benchtop  220  has upper side  221  and lower side  222 , and includes bench panel  223  and bench frame  224 . Bench frame  224  is integrally formed or coupled with a lower side of bench panel  223  for connecting bench leg assembly  250  such that bench leg assembly  250  is rotatable with respect to bench panel  223  or benchtop  220 . In some exemplary embodiments, bench frame  224  includes a first bench mounting member such as first bench mounting member  225  and a second bench mounting member such as second bench mounting member  226 . The first and second bench mounting members are spaced apart generally in the first direction. In some exemplary embodiments, bench frame  224  includes additional or operational members. For instance, in an exemplary embodiment, bench frame  224  includes an additional member such as strengthening member  227  disposed at the middle portion of the benchtop and between the first and second bench mounting members. Strengthening member  227  disperses local stresses and enhances the strength and stability of the benchtop. 
     Table leg assembly  240  is pivotally coupled with the tabletop and rotatable with respect to the tabletop. For instance, in some exemplary embodiments, table leg assembly  240  includes a table leg linking member such as table leg linking member  242  pivotally connected with the first and second table mounting members of the table frame. In an exemplary embodiment, table leg linking member  242  or the end portion  242   a  is substantially the same as or similar to table leg linking member  132  disclosed herein (e.g., having an oval cross section such as end portion or the like at an end portion). 
     In some exemplary embodiments, table leg assembly  240  also includes one or more legs each having an upper end portion fixedly connected with table leg linking member  242 . For instance, in some exemplary embodiments, table leg assembly  240  includes a first leg such as first leg  244  and a second leg such as second leg  246 . The first and second legs are spaced apart in the first direction, each having an upper end portion fixedly connected with the table leg linking member. In some exemplary embodiments, to further enhance the strength of the first or second table leg assembly, the first and second legs are connected with each other by one or more leg links. For instance, by way of example,  FIGS. 4A and 4B  illustrate one leg link, e.g., first leg link  247 , disposed between the first and second legs and coupled with the first and second legs. 
     In some exemplary embodiments, each of the first and second legs of table leg assembly  240  is adjustable in length. For instance, in an exemplary embodiment, each of the first and second legs of table leg assembly  240  includes first bar  245   a  and second bar  245   b  telescopically coupled with each other and locking/unlocking mechanism  245   c  to control relative movement of the first and second bars. Examples of adjustable leg assemblies and/or other relevant features are disclosed in U.S. patent application Ser. No. 15/400,861, Ser. No. 15/931,925, Ser. No. 16/838,939, Ser. No. 16/838,944, Ser. No. 17/000,661, Ser. No. 17/003,047, Ser. No. 17/038,369 and Ser. No. 17/069,458, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. As such, when unfolded, one can change the height of the table panel by adjusting collectively the lengths of table leg assemblies  240  of the leg 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 leg assembly can be folded onto the table and bench panels, thereby making the picnic table compact and convenient for storage and transportation. 
     Bench leg assembly  250  is pivotally coupled with the benchtop and rotatable with respect to the benchtop. For instance, in some exemplary embodiments, bench leg assembly  250  includes a bench leg linking member such as bench leg linking member  252  pivotally connected with the first and second bench mounting members of the bench frame. In an exemplary embodiment, bench leg linking member  252  is substantially the same as or similar to table leg linking member  132  disclosed herein (e.g., having an oval cross section or the like at an end portion). 
     Bench leg assembly  250  can include one or more bench legs. For instance, in some exemplary embodiments, bench leg assembly  250  includes two bench legs such as first bench leg  254  and second bench leg  256 . In an exemplary embodiment, the first and second bench legs are coupled with each other and collectively form a structure of a substantially “Y” shape as illustrated in  FIG. 4A . 
     In some exemplary embodiments, the one or more bench leg assemblies are coupled with the table leg assembly, for instance, by a connecting member such as connecting member  232 . As such, the rotation of the one or more first bench leg assemblies with respect to the one or more benchtops can be synchronized with the rotation of the first table leg assembly with respect to the tabletop, e.g., each leg assembly  230  rotating as one unit between a use position as illustrated in  FIG. 4A  and a storage position as illustrated in  FIG. 5D . When in the use positions, the leg assemblies support the tabletop and one or more benchtops. When in the storage positions, each table leg assembly is folded onto the tabletop and each bench leg assembly is folded onto the benchtop. 
     In some exemplary embodiments, picnic table  200  further includes one or more supporting assemblies such as supporting assembly  260  configured to control the rotation (e.g., folding and unfolding) of the one or more table leg assemblies with respect to the tabletop, and/or to lock the one or more table leg assemblies when desired. By way of example,  FIGS. 4A and 4B  illustrate two supporting assemblies, which can be the same or different from each other. Each supporting assembly  260  is pivotally connected with the table frame and a corresponding table leg assembly. For instance, in an exemplary embodiment, supporting assembly  260  is configured substantially the same as first supporting assembly  150   a  or second supporting assembly  150   b . It includes first supporting member  152  and second supporting member  154  slidably and rotatably coupled with each other by controller  160 . In addition, first supporting member  152  is pivotally coupled with table leg assembly  240 , for instance, coupled with first leg link  247  of table leg assembly  240 . Second supporting member  154  is pivotally coupled with the tabletop through third supporting member  156 . As such, supporting assembly  260  controls rotation of the table leg assembly with respect to the tabletop. When the table is in use, supporting assembly  260  holds the table leg assembly in its use position and prevents the table leg assembly from rotating with respect to the tabletop. As such, the table is very stable and safe to use. 
     Referring to  FIGS. 4A and 5A-5D , there is depicted an exemplary process to fold picnic table  200  in accordance with some embodiments of the present disclosure. First, the table leg assembly is adjusted to level the table and bench panels as illustrated in  FIG. 5A . Then each leg assembly is rotated and folded onto the leveled table and bench panels as illustrated in  FIGS. 5B and 5C . The folded picnic table is shown in  FIG. 5D , which has a panel-like shape. As such, when folded, it is compact, and thus easy and convenient for storage and transportation. Reversing the process unfolds the picnic table. 
     Referring now to  FIGS. 6A-6C , there is depicted exemplary picnic table  300  in accordance with some embodiments of the present disclosure. Picnic table  300  includes a tabletop such as tabletop  310 , one or more benchtops such as benchtop  320 , and one or more leg assemblies such as leg assembly  330  to support the tabletop and one or more benchtops. Leg assembly  330  includes a table leg assembly such as table leg assembly  340  to support the tabletop and, corresponding to each benchtop, a bench leg assembly such as bench leg assembly  350  to support the benchtop. By way of example,  FIGS. 6A-6C  illustrate two benchtops and two leg assemblies. The two benchtops can be the same as or different from each other. Similar, the two leg assemblies can be the same as or different from each other. 
     In some exemplary embodiments, tabletop  310  has an upper side and a lower side, and includes a table panel and a table frame. For instance, in an exemplary embodiment, tabletop  310  has upper side  311  and lower side  312 , and includes table panel  313  and table frame  314 . Table frame  314  is integrally formed or coupled with a lower side of table panel  313  for connecting table leg assembly  340  such that table leg assembly  340  is rotatable with respect to table panel  313  or tabletop  310 . In some exemplary embodiments, table frame  314  includes a first table mounting member such as first table mounting member  315  and a second table mounting member such as second table mounting member  316 . The first and second table mounting members are spaced apart generally in a first direction, e.g., the x-direction in  FIG. 6B . In an exemplary embodiment, each of the first and second table mounting member includes a straight bar and a bended bar coupled or formed with the middle portion of the rail bar. Table frame  314  also includes one or more table leg linking members coupled with the first and second table mounting members. For instance, in an exemplary embodiment, table frame  314  includes first table leg linking member  317  and second table leg linking member  318 . Each of the first and second table leg linking members has an end portion integrally formed or fixedly connected with the first table mounting member and another end portion integrally formed or fixedly connected with the second table mounting member. 
     Similar to tabletop  310 , in some exemplary embodiments, benchtop  320  has an upper side and a lower side, and includes a bench panel and a bench frame. For instance, in an exemplary embodiment, benchtop  320  has upper side  321  and lower side  322 , and includes bench panel  323  and bench frame  324 . Bench frame  324  is integrally formed or coupled with a lower side of bench panel  323  for connecting bench leg assembly  340  such that bench leg assembly  340  is rotatable with respect to bench panel  323  or benchtop  320 . In some exemplary embodiments, bench frame  324  includes a first bench mounting member such as first bench mounting member  325  and a second bench mounting member such as second bench mounting member  326 . The first and second bench mounting members are spaced apart generally in the first direction. Bench frame  324  also includes one or more bench leg linking members coupled with the first and second bench mounting members. For instance, in an exemplary embodiment, bench frame  324  includes first bench leg linking member  327  and second bench leg linking member  328 . Each of the first and second bench leg linking members has an end portion integrally formed or fixedly connected with the first bench mounting member and another end portion integrally formed or fixedly connected with the second bench mounting member. 
     In some exemplary embodiments, table leg assembly  340  is rotatable with respect to tabletop  310  around an axis parallel to a first direction (e.g., the x-direction in  FIG. 6A  or the lateral direction of the tabletop). For instance, in some exemplary embodiments, table leg assembly  340  includes one or more legs each having an upper end portion pivotally connected with first table leg linking member  317  or second table leg linking member  318  of table frame  314 . In some exemplary embodiments, to further enhance the strength of the first or second table leg assembly, the first and second legs are connected with each other by one or more leg links such as first link  348  and second link  349 . In some exemplary embodiments, table leg assembly  340  is configured to be an adjustable assembly or to include an adjustable assembly for adjusting the length of the table leg assembly and thus the height of the table panel. In an exemplary embodiment, one of the leg links (e.g., second link  349 ) is also configured to lock or unlock the adjustable assembly (e.g., to allow or prevent relative movement between upper portion  346  and lower portion  347  of the leg assembly). Examples of locking/unlocking mechanisms are disclosed in U.S. patent application Ser. No. 15/400,861, Ser. No. 15/931,925, Ser. No. 16/838,939, Ser. No. 16/838,944, Ser. No. 17/000,661, Ser. No. 17/003,047, Ser. No. 17/038,369 and Ser. No. 17/069,458, the disclosure of each application is incorporated herein for all purposes by reference in its entirety. As such, when unfolded, one can change the height of the table panel by adjusting collectively the lengths of table leg assemblies  340  of the leg assemblies. 
     Bench leg assembly  350  is rotatable with respect to benchtop  320  around an axis parallel to the first direction. For instance, in some exemplary embodiments, bench leg assembly  350  includes at least one leg having an upper end portion pivotally connected with first bench leg linking member  327  or second bench leg linking member  328  of bench frame  324 . In some exemplary embodiments, the at least one leg is integrally formed or connected with a second supporting bar (e.g., second supporting bar  351  disclosed herein) of bench leg assembly  350 . In an exemplary embodiment, the at least one leg is a portion of the second supporting bar of bench leg assembly  350 . 
     In some exemplary embodiments, table leg assembly  340  and bench leg assembly  350  of leg assembly  330  are connected with each other and rotatable with respect to each other around an axis parallel to 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, leg assembly  330  includes one or more connectors such as connector  360 , each for pivotally connecting one bench leg assembly  350  with table leg assembly  340  such that the bench leg assembly is rotatable with respect to the table leg assembly in the second direction. As such, picnic table  300  is foldable multiple times. 
     In some exemplary embodiments, picnic table  300  further includes one or more supporting assemblies to control the rotation (e.g., folding and unfolding) of the one or more leg assemblies, and/or to lock the one or more leg assemblies when the table is in use. In some exemplary embodiments, table leg assembly  340  includes a first supporting bar such as first supporting bar  341  and bench leg assembly  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 benchtop  320  is unfolded from tabletop  310 , or when the picnic table is unfolded). Connector  360  pivotally connects the second supporting bar of the bench leg assembly with the first supporting bar of the table leg assembly such that the second supporting bar is rotatable with respect to the first supporting bar of the table leg assembly in the second direction. 
     Referring to  FIGS. 7 and 8A-8C , there is depicted connector  360  and the use of the connector to connect the second supporting bar of the bench leg assembly with the first supporting bar of the table leg assembly in accordance with some exemplary embodiments of the present disclosure. Of these figures,  FIG. 7  is an enlarged perspective view taken along oval C of  FIG. 6B , illustrating 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. 
     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  361 , second connecting piece  362 , first fastener  365  and second fastener  366 . 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  363  having an end fixedly connected or integrally formed with first connecting piece  361  and another end fixedly connected or integrally formed with second connecting piece  362 . 
     First fastener  365  pivotally connects end portion  341   a  of first supporting bar  341  of the table leg assembly with the first and second connecting pieces. Second fastener  366  pivotally connects end portion  351   a  of second supporting bar  351  of the bench leg assembly with the first and second connecting pieces. First supporting bar  341  of the table leg assembly or second supporting bar  351  of the bench leg assembly 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 leg assembly or second supporting bar  351  of the bench leg assembly 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 leg assembly (and thus the table panel) or second supporting bar  351  of the bench leg assembly (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  367  and a second pin such as second pin  368 . First pin  367  and second pin  368  are disposed at (e.g., fixed coupled or integrally formed with) the first and/or second connecting pieces of connector  360 . First pin  367  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  368  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 leg assemblies, 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  367  when the picnic table is unfolded and second indentation  342   b  is configured to accommodate crosswise at least a portion of first pin  367  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  368  when the picnic table is unfolded and second indentation  352   b  is configured to accommodate crosswise at least a portion of second pin  368  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 leg assembly. 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 leg assembly. 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. 
     In some exemplary embodiments, to further 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 an end surface that is at least partially curved. For instance, in an exemplary embodiment, end portion  341   a  of the first supporting bar includes a first end surface such as first end surface  343 , and end portion  351   a  of the second supporting bar includes a second end surface such as second end surface  353 . 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 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 make it easy to rotate the first and second supporting bars with respect to each other. 
     Referring back to  FIGS. 6A and 6B , in some exemplary embodiments, picnic table  300  further includes one or more supporting assemblies to control the rotation (e.g., folding and unfolding) of the one or more leg assemblies, and/or to lock the one or more leg assemblies when the table is in use. The one or more supporting assemblies can be the same as or different from each other. By way of example,  FIGS. 6A and 6B  illustrate two supporting assemblies  370  each pivotally connected with the table frame and a corresponding table leg assembly. In some exemplary embodiments, supporting assembly  370  includes first supporting member  152  and second supporting member  154  slidably and rotatably coupled with each other by controller  160 . First supporting member  152  is pivotally coupled with table leg assembly  340 , for instance, coupled with first leg link  348  of table leg assembly  340 . In an exemplary embodiment, second supporting member  154  includes two supporting bars, one on each side of the controller. One supporting bar has an end portion pivotally connected with controller  160  and the other end portion pivotally connected with first table mounting member  315 . The other supporting bar has an end portion pivotally connected with controller  160  and the other end portion pivotally connected with second table mounting member  316 . As such, supporting assembly  370  controls the rotation of the leg assembly. When the table is in use, supporting assembly  370  holds the leg assembly in its use position and prevents the leg assembly from rotating with respect to the tabletop. As such, the table is very stable and safe to use. 
     Referring to  FIGS. 6C-6J , there is depicted an exemplary process for folding and unfolding picnic table  300 . First, the table leg assembly is adjusted to level the table and bench panels as illustrated in  FIG. 6D . Then each leg assembly is rotated and folded onto the leveled table and bench panels as illustrated in  FIGS. 6E and 6F . After that, each bench panel is rotated and folded onto the table panel as illustrated in  FIGS. 6G-6I . The folded picnic table is illustrated in  FIG. 6J . The leg assemblies (at least a portion of them) are sandwiched between the table and bench panels. While rotation illustrated in  FIGS. 6G-6I  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. 
     The components disclosed herein are combinable in any useful number and combination. For example, table leg assembly  240  can replace first table leg assembly  130   a  and second table leg assembly  130   b  of table  100  to make table  100  adjustable in height. As another example, supporting assembly  370  can replace supporting assembly  260 . 
     The supporting assemblies, supporting frames and tables of the present disclosure have several advantages. For instance, the supporting assemblies and other additional/optional structures help dispersing localized stresses and thus prolonging the lifespan of the tables. Moreover, the supporting assemblies and other additional/optional structures help stabilizing and supporting the leg assemblies when unfolded and thus enhancing the stability of the tables when in use. Further, the supporting assemblies and other additional/optional structures make folding and unfolding of the tables smooth and fast. In addition, the tables disclosed herein are easy to fold and unfold, and compact when folded. 
     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.