Abstract:
A seat box assembly and method of fabricating utilizing a drop-in webbing assembly secured into a main box and back frame assembly. The webbing assembly has a rectangular frame with elongate members and shorter members and a central girder with a cutout extending between mid-portions of the elongate members. The central girder attachable to the seat box and a central vertical frame member of the back frame assembly. The elongate members having stub portions that fit into slots in the main seat box. A method of repair includes replacing a damaged drop-in assembly with a different drop-in assembly.

Description:
RELATED APPLICATIONS 
     This patent application claims the benefit of U.S. Provisional Patent Application No. 61/829,734, filed on May 31, 2013, the disclosure of which is hereby incorporated by reference herein in its entirety. 
    
    
     FIELD OF THE DISCLOSURE 
     The present disclosure is directed to a furniture item comprising a seat box. More specifically, the present disclosure is directed to a furniture item comprising a seat box having a drop in webbing assembly. 
     BACKGROUND OF THE DISCLOSURE 
     Currently, seat boxes available on the market often comprise a main box defining a hollow interior space, wherein a rigid plank to which a cushion or a plurality of cushions are affixed rests on the main box such that the cushioned rigid plank is supported over the interior space. The advantage of this type of seat box simplicity in design that is easily constructed. However, the rigid plank is typically impermeable to moisture, such that, should the cushion become moist or wet, the cushion may not fully dry out while in place. The collection of moisture or wetness can reduce the serviceable life of the cushion. An attempted solution was replacing the conventional wooden rigid plank with an air permeable rigid seat plank. The inherent drawback of both the conventional rigid plank and the air permeable rigid seat plank is that the limited flexibility of the seat plank is uncomfortable to seated individuals. The air permeable rigid seat planks were replaced with high tensile strength webbing stretched across the main box, wherein the cushion is affixed to the webbing. The webbing provides the advantages of both a flexible seating surface and a permeable support structure for the cushion. However, any damage to the main box or the webbing due to misuse or other causes requires that the entire seat box be replaced. Due to the size and weight of the seat box, replacement of the entire seat box can be challenging and inconvenient. 
     SUMMARY OF THE DISCLOSURE 
     Various embodiments of the disclosure are directed to a seat box with a drop in webbing assembly that provides the advantages of permeability and comfortableness, with the added advantage of more convenient installation and replacement. In some embodiments, the web assembly is separately inserted into the main frame and seat back assembly, supports the web tension without the need for attachment to the main frame and seat back assembly, and can be replaced as a unit if damaged. The web assemblies may be separately manufactured and utilized for field repairs. In certain embodiments, the web assembly is formed entirely of wood and/or wood products and does need steel cross supports between the principal elongate frame members. 
     Structurally, a seat box assembly is disclosed, comprising a main box including a front rail and a back rail separated by a pair of side rails to define an interior space. A back frame assembly extends vertically from the main box, the back frame assembly including a pair of side uprights and a middle upright. In one embodiment, each of the uprights is affixed to an interior face of the back rail, and each of the side uprights of the pair of side uprights extend upwards from a respective one of the pair of side rails of the main box to define an apex at the intersection of the side upright and the side rail. A drop-in webbing assembly is also disclosed, comprising a webbing frame including a forward spring rail and a rearward spring rail separated by a pair of cross rails, wherein each end of the rearward spring rail extends laterally beyond each of the cross rails to define a pair of protruding portions of the rearward spring rail. In certain embodiments, the drop-in webbing assembly further comprises a central girder attached to mid-portions of each of the elongate frame members, and a webbing spanning between the forward spring rail and the rearward spring rail. The central girder can comprise a wooden material. In various embodiments, structure defining a rearward notch is included proximate each apex of the side rails and the side uprights to define a pair of rearward notches, each of the rearward notches including a first lead-in structure on the respective side upright of the respective apex and a second lead-in structure on the respective side rail of the respective apex. In one embodiment, the second lead-in structure of each rearward notch is a chamfered lead-in structure. In one embodiment, the drop-in webbing assembly is removably attached to the main box and back frame as a unit with the webbing and the central girder attached thereto. 
     Each of the side rails of the pair of side rails can further comprise structure defining a forward notch proximate the front rail. Each of the forward notches can include a third lead-in structure. In various embodiments, the third lead-in structure comprises chamfered lead-in structure. In one embodiment, a tapered face the chamfered lead-in structure of the second lead-in structure faces in a direction towards the back rail and a tapered face of the chamfered lead-in structure of the third lead-in structure faces in a direction towards the front rail. 
     In various embodiments, the central girder of the drop-in webbing assembly includes a forward block and a rearward block connected by a cross member, the forward block including a first notch formed thereon, the rearward block including a second notch formed thereon. In these embodiments, the forward spring rail can be disposed in the first notch of the forward block, and the rearward spring rail can be disposed in the second notch of the rearward block. In one embodiment, the forward block includes an extension portion that extends beyond the forward block in a forward direction. The front rail can define a notch that is open to an upper edge of the front rail, and the extension portion of the forward block can be registered in the notch of the front rail. In some embodiments, the rearward block includes an extension portion that extends beyond the second notch of the rearward block in a rearward direction. The back rail can define a notch that is open to a lower edge of the back rail, and the extension portion of the rearward block is registered in the notch of the back rail. In various embodiments, the rearward block is affixed to the middle upright. The webbing can comprise a plurality of webbing straps. 
     In a method embodiment of the disclosure, a method of assembling a seat box includes:
         providing a sub assembly comprising: a main box including a front rail and a back rail separated by a pair of side rails to define an interior space, the main box including upper edges that substantially define a plane; and a back frame assembly extending vertically from the main box, the back frame assembly including a pair of side uprights and a middle upright, each of the side uprights of the pair of side uprights extending upwards from a respective one of the pair of side rails of the main box to define an apex at the intersection of the side upright and the side rail, wherein structure defining a rearward notch is included proximate each apex of the side rails and the side uprights to define a pair of rearward notches, each of the rearward notches including at least one lead-in structure and a support face;   providing a drop-in webbing assembly comprising: a webbing frame including a forward spring rail and a rearward spring rail separated by a pair of cross rails, wherein each end of the rearward spring rail extends laterally beyond each of the cross rails to define a pair of protruding portions of the rearward spring rail; and a central girder attached to mid-portions of each of the elongate frame members, the central girder including a rearward block affixed to the rearward spring rail of the webbing frame;   inserting the drop-in webbing assembly into the interior space of the main box so that the rearward block of the central girder is immediately adjacent a lateral face of the middle upright of the back frame assembly, the drop-in webbing assembly being inserted at an acute angle relative to the plane of the upper edges of the main box;   disposing each protruding portion of the pair of protruding portions into a respective one of the rearward notches via the at least one lead-in structure;   rotating the drop-in webbing assembly about the rearward spring rail when the pair of protruding portions are lodged within the rearward notches, so that the forward spring rail is rotated towards the main box; and   registering the drop-in webbing assembly within the main box, so that the rearward spring rail is registered against the support faces of the rearward notches.       

     The method can further comprise sliding the pair of protruding portions over the at least one lead-in structure to stretch the webbing frame. In one embodiment, the at least one lead-in structure of each of the rearward notches of the subassembly provided in the step of providing a subassembly are chamfered lead-in structures. Also, the at least one lead-in structure of each of the rearward notches of the subassembly provided in the step of providing a subassembly can include a first lead-in structure on the respective side upright of the respective apex and a second lead-in structure on the respective side rail of the respective apex. 
     Each side rail of the pair of side rails of the subassembly provided in the step of providing a subassembly can includes a forward notch to define a pair of forward notches, each forward notch including a support face. In one embodiment, the forward spring rail of the webbing frame provided in the step of providing a drop-in webbing assembly extends laterally beyond each of the cross rails to define a pair of protruding portions of the forward spring rail, and the protruding portions of the forward spring rail are placed in contact with the support faces of the pair of forward notches during the step of registering the drop-in webbing assembly within the main box. 
     In one embodiment, each of the forward notches includes a lead-in structure, and the method further comprises sliding the pair of protruding portions of the forward spring rail over the lead-in structures of the pair of forward notches to stretch the webbing frame. In various embodiments, the webbing frame provided in the step of providing a drop-in webbing assembly includes a webbing. 
     In one embodiment, a seat box comprises a main box and a webbing assembly. The main box comprises a rectangular seat frame defining the seating portion and a back frame set vertically on one side of the rectangular seat frame. The webbing assembly further comprises a plurality of webbing strips and a rectangular webbing frame having two parallel primary or spring rails and two cross-rails at the ends of the spring rails to define the rectangular frame. Each cross-rail is positioned inward of the ends of the spring rails such that a protruding portion of the spring rails protrudes past the cross-rail, wherein the spring rails are sized to correspond to the dimensions of the seat box such that the spring rails can rest on the rectangular seat frame. In certain embodiments, the rectangular seat frame comprises at least one notch for receiving the protruding portion of the spring rail. The webbing assembly also comprises a central girder parallel to the cross-rails at the center the spring rails. The wooden central girder is sized to extend beyond the spring rails such that a portion of the central girder extends past the cross-rail such that the central girder can engage the rectangular seat frame. The rectangular seat frame can further comprise at least one notch for receiving the extended portion of the central girder. In certain embodiments, the notches comprise chamfered or stepped lead-ins such that the protruding portions of the webbing frame are insertable flush into the notches. 
     In certain embodiments, the main box can further comprise legs positioned at the corners of the main box for elevating the seat box. 
     In certain embodiments, the ends of the webbing strips are affixed to the spring rails such that the webbing strips extend between the spring rails. In certain embodiments, a portion of the webbing strips can be secured to the cross-rails of the webbing assembly such that the webbing strips are arranged in a crisscross or parallel knitted webbing. The webbing frame can further comprise gussets positioned at the corners of the webbing frame to reinforce the frame. 
     The above summary of the various representative embodiments are is not intended to describe each illustrated embodiment or every implementation. Rather, the embodiments are chosen and described so that others skilled in the art can appreciate and understand the principles and practices of the disclosure. The figures in the detailed description that follow more particularly exemplify these embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a seat box assembly in an embodiment of the disclosure; 
         FIG. 2  is a side view of the seat box assembly depicted in  FIG. 1 ; 
         FIGS. 3 and 4  are perspective views of a main box and a back frame set in an embodiment of the disclosure; 
         FIG. 5  is a perspective view of a joint between the main box and the back frame set in an embodiment of the disclosure; 
         FIG. 6  is a perspective view of a middle support of the back frame in an embodiment of the disclosure; 
         FIG. 7  is a perspective view of a top side of a webbing assembly in an embodiment of the disclosure; 
         FIGS. 8 and 9  are bottom perspective views of a seat box webbing in an embodiment of the disclosure; 
         FIGS. 10 and 11  are perspective views of the center support frame of the webbing assembly in an embodiment of the disclosure; 
         FIG. 12  is a perspective view of a corner gusset of the webbing assembly in an embodiment of the disclosure; 
         FIGS. 13-20  are is a perspective views of the webbing assembly being inserted into a subassembly of a rectangular seat frame and a back frame in an embodiment of the disclosure; and 
         FIG. 21  is a schematic of a drop-in webbing assembly installed with opposed lead-ins on forward and rearward notches in an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     As depicted in  FIGS. 1 through 12 , a seat box assembly  30  is depicted in an embodiment of the disclosure. The seat box assembly  30  includes a main box  32 , a back frame assembly  34 , a drop-in webbing assembly  36 , and at least one cushion  38 . The main box  32  comprises a front rail  42 , a back rail  44 , and two side rails  46 , each of the rails  42 ,  44 , and  46  including a respective interior face  52 ,  54 , and  56  that defines and bounds an interior space  48 . In one embodiment, the side rails  46  each include a mounting block  58  affixed to the interior face  56  thereof. The main box  32  can also include a bottom panel  62  that defines a floor  64  of the interior space  48 . In certain embodiments, the main box  32  can further comprise a plurality of legs  66  positioned at the corners for elevating the seat box. The legs  66  can be positioned at the corners, on the front and back rails  42  and  44  along the length of main box  32 , and/or on the side rails  46 . 
     The back frame assembly  34  can comprise a pair of side uprights  72  and  74  (i.e., a left upright  72  and a right upright  74 ) and a middle upright  76 , extending vertically from the back rail  44  of the main box  32  and tied together by backrest rails  78  and/or a cap rail assembly  80 . In one embodiment, the back frame assembly  34  is affixed to the back rail  44  of the main box  32 . Each of the side uprights  72 ,  74  can extend upwards from a respective one of the side rails  46 , defining an apex  82  where an upper edge  84  of the respective side rail  46  and a forward edge  86  of the respective side upright  72  or  74  intersect. In some embodiments, the left and right uprights  72  and  74  are integral to the side rails  46  (i.e., cut from the same panel stock, such as depicted in  FIGS. 1 and 2 ); in other embodiments, each of the left and right uprights  72  and  74  are inserted between the respective side rail  46  and the back rail  44  to abut the respective side rail  46  and are joined thereto, for example with staples ( FIG. 5 ). In one embodiment, the middle upright  76  is disposed within the main box  32  and affixed to the interior surface  54  of the back rail  44 . Also, unlike certain conventional seat box designs, the middle upright  76  of the depicted back frame assembly  34  does not include a spring rail retainer. 
     The side rails  46  of the main box can each define a rearward notch  92  proximate the apex  82  at the junction of the side rail  46  and the side upright  72  or  74 . Each rearward notch  92  is characterized as including a support face  94 , to which weight is transferred from the drop-in webbing assembly  36  in a load bearing relationship. In one embodiment, the rearward notch  92  includes one or more lead-in structures  96 . In the depiction of  FIG. 5 , two examples of such lead-in structures are presented: a tapered or chamfered lead-in structure  102  formed on the side rail  46  that defines an obtuse angle relative to the support face  94  of the rearward notch  92 ; and a stepped lead-in structure  104  formed on the adjoining side upright  72  or  74 . Other lead-in structures, including convex-arcuate or concave-arcuate profiled edges (not depicted) can also be utilized. Each side rail  46  can further define a forward retention structure  106 , such as a forward notch  108  formed proximate the front rail  42  of the main box  32 . The forward notches  108  are also characterized as including a support face  112 , and can also define a lead-in structure  114 . Other forward retention structures include a notch (not depicted) formed on the front rail  42 , or a structure such as a pocket or notch attached to the interior of the main box (not depicted), proximate the corner of the webbing assembly  36  and adapted to receive the webbing assembly  36 . 
     The webbing assembly  36  comprises a webbing frame  120  having a forward spring rail  122 , a rearward spring rail  124 , and a pair of parallel cross-rails  126  positioned proximate the ends  128  and  132  of the forward and rearward spring rails  122  and  124 , respectively. A plurality of webbing straps  134  are mounted to the webbing frame  120 , spanning between the forward and rearward spring rails  122  and  124 . In one embodiment, the webbing frame  120  can be further supported by gussets  136 . The cross-rails  126  can be positioned to define protruding portions  138 ,  142  at the ends  128  and  132  of the forward and rearward spring rails  122  and  124 , respectively, that protrude laterally beyond the cross-rails  126 . 
     The webbing assembly  36  can further comprise a central girder  144  that extends between the forward and rearward spring rails  122  and  124  and is substantially parallel to the cross-rails  126 . In one embodiment, the central girder  144  comprises a forward block  146  and a rearward block  148  connected by a cross member  152 . In one embodiment, the forward and rearward blocks  146  and  148  are mounted to the same side of the cross member  152 . The forward and rearward blocks  146  and  148  can each include a respective notch  156  and  158  defined thereon. The forward block  146  can further include a registration block  162  that is mounted flush with the notch  146 . In one embodiment, the registration block  162  includes an extended portion  164  that extends beyond the forward block  146  in the forward direction. 
     In one embodiment, the rearward block  148  includes an extended portion  166  that extends rearward of the notch  158  formed thereon, and includes a contoured surface  168  that tapers to a height that is flush with a top edge  172  of the cross member  152  at a back end  174  of the central girder  144 . The back end  174  of the central girder  144  can be characterized as including a rearward face  173  (i.e., substantially perpendicular to the x-direction) having a rearward face area  175  and an exposed lateral face  177  (i.e., substantially perpendicular to the y-direction) of the rearward block  148 , as depicted in  FIG. 9 . In one embodiment, when the seat box  30  is assembled, the exposed lateral face  177  of the rearward block  148  overlaps with a lateral face  178  of the middle upright  76  to define an overlapping contact area  179 , depicted in phantom shading in  FIG. 6 . In one embodiment, an area ratio of the overlapping contact area  179  to the rearward face area  175  is between 2 and 20 inclusive. In other embodiments, the area ratio is between 2 and 10 inclusive. In still other embodiments, the area ratio is between 4 and 10 inclusive. 
     The forward and rearward spring rails  122  and  124  of the webbing frame  120  are seated within the notches  156 ,  158  of the forward and rearward blocks  146  and  148  of the central girder  144 , and can be affixed to the central girder  144 , for example, with staples and/or glue. In one embodiment, the location of the central girder  144  on the forward and rearward spring rails  122  and  124  is such that, when the webbing assembly  36  is disposed in the main box  32 , the rearward block  148  is immediately adjacent or registers against a lateral face  178  the middle upright  76  of the back frame assembly  34 . 
     In certain embodiments, each webbing strap  134  can be affixed at the ends to the forward and rearward spring rails  122  and  124  such that the webbing straps  134  are suspended between the forward and rearward spring rails  122  and  124  (e.g.,  FIG. 1 ). In other embodiments, cross-webbing straps  176  can extend between and be affixed to the ends to the cross-rails  126  and interwoven with the webbing straps  134  extending between the forward and rearward spring rails  122  and  124  (e.g.,  FIG. 3 ). 
     The gussets  136  can be positioned at the four corners of the webbing frame  120 . The gussets  136  reinforce the webbing frame  120  to prevent collapse of the forward and rearward spring rails  122  and  124  and cross-rails  126  due the tension load exerted on the webbing frame  120  by the webbing straps  134  and the cross-webbing straps  176 . The gussets  136  can be affixed to the webbing frame  120  using known mechanical fastening techniques (e.g., staples, nails, screws) and/or by gluing. 
     In one embodiment, the front rail  42  and back rail  44  of the main box  32  each define a respective registration notch  182  and  184  for receiving the extended portions  164 ,  166  of the central girder  144 . In one embodiment, the registration notch  182  of the front rail  42  is open to an upper edge  186  of the front rail  42 , whereas the registration notch  184  of the back rail  44  is open to a lower edge  188  of the back rail  44 . 
     In assembly, fixturing (not depicted) can be used during buildup of the webbing assembly  36  to assure proper distances and orientation are maintained during placement of components. Examples of distances and placement that can be maintained by the fixturing include the protruding portions  138  and  142  of the forward and rearward spring rails  122  and  124  beyond the side rails  126 , location of the gussets  136 , and the location of the central girder  144 . The rearward notches  92  of the side rails  46  receive the protruding portions  142  of the rearward spring rail  124 . In certain embodiments, the rearward notches  92  can be positioned such that the webbing assembly  36  is aligned with the main box  32  as the webbing assembly  36  is inserted therein. 
     Functionally, the central girder  144  provides mid-span support of the webbing assembly  36  within the main box  32 , and also maintains the spacing of the forward and rearward spring rails  122  and  124  at the mid span. Maintaining the spacing of the forward and rearward spring rails  122  and  124  can also maintain the webbing straps  134  at a desired level of tension for support of the cushion  38 . In one embodiment, the registration block  162  and a support face of the notch  156  of the forward block  146  combine to provide a mounting surface for the forward spring rail  122 . For embodiments including the extended portion  164  of the registration block  162  that extends beyond the forward block  146 , the registration block  162  can also mate with the registration notch  182  of the front rail  42  of the main box  32 . The overlapping contact area  179 , being larger than the rearward face area  175 , can provide attachment points between the central girder  144  and the middle upright  76  that are spaced further apart than attachment points would be on the rearward face area  175 , enhancing the relative strength and stability of the joint between the central girder  144  and the middle upright  76 . 
     Referring to  FIGS. 13-20 , installation of the drop-in webbing assembly  36  into the main box  32  is depicted in an embodiment of the disclosure. In the depictions, the back frame assembly  34  is mounted on one side of the main box  32  as a subassembly  200 , with the subassembly  200  rotated  90  degrees so that the back frame assembly  34  and the back rail  44  are registered on an assembly plane  202  ( FIG. 13 ). (The assembly plane  202  can comprise, for example, the floor of an assembly area, as depicted, or a bench top.) In this orientation, the substructures within the main box  32  are readily accessible for assembly operations, such as the fastening of assembled components to each other. It is noted, however, that other assembly orientations for the subassembly  200  can be utilized, for example: in the normally upright position; on its side with one of the side rails  46  and side uprights  72  or  74  registered on the assembly plane  202 ; or on a fixture that orients the subassembly  200  in a desired orientation. 
     With the subassembly  200  in the assembly orientation, the webbing assembly  36  is inserted into the subassembly  200  at an acute angle θ relative to the upper edges  84 ,  186 , of the main box  32  ( FIG. 13 ), with the rearward block  148  of the central girder  144  aligned to be adjacent a pre-designated side of the middle upright  76  ( FIGS. 14 and 15 ). As the insertion operation progresses, the protruding portions  142  of the rearward spring rail  124  enter the rearward notches  92  of the side rails  46  of the main box  32  by passing over the lead-in structures  96  of the left and right uprights  72  and  74  ( FIGS. 16 and 17 ). 
     Once the protruding portions  142  of the rearward spring rail  124  are disposed in the rearward notches  92 , the webbing assembly  36  is rotated about the rearward spring rail  124  toward the main box  32  ( FIGS. 18 and 19 ) until the forward spring rail  122  is fully registered on the main box  32  ( FIG. 20 ). For embodiments that utilize protruding portions  138  on the forward spring rails  122  and forward notches  108  on the side rails  46 , full registration is accomplished when the protruding portions  138  of the forward spring rails  122  contact the support faces  112  of the forward notches  108 . Another indicia of full registration is when the cross members  126  of the webbing frame  120  make contact with the mounting blocks  58  of the side rails  46 . Also during the rotation of the webbing assembly  36 , for embodiments utilizing the registration notches  182 ,  184  on the front and back rails  42  and  44 , the extended portions  164 ,  166  of the central girder  144  rotate into the respective registration notches  182 ,  184 . 
     Once the webbing assembly  36  is fully registered within the main box  32 , the webbing assembly  36  can be affixed to the subassembly  200 . For example: the rearward block  148  can be affixed to the middle upright  76 ; the cross-rails  126  of the webbing frame  120  can be affixed to the side rails  46  of the main box  32 ; and/or the forward spring rail  122  can be affixed to the front rail  42  of the main box  32 . Fixing the webbing assembly  36  to the main box  32  can be accomplished, for example, by gluing and/or by standard fastening techniques such as stapling, nailing, screwing, or bolting. It is noted that, for some embodiments, it is desirable to have the webbing assembly  36  be removable from the subassembly  200  after installation, for replacement or repair. In such embodiments, certain fastening methods are favored, such as bolting, that can be readily reversed after installation. 
     Referring to  FIG. 21 , an arrangement wherein the forward and rearward notches  108  and  92  of the side rails  46  define the chamfered lead-in structures  102  that face away from each other is schematically depicted in an embodiment of the disclosure. A tapered face  204  of the chamfered lead-in  102  of the forward notch  108  faces forward, while a tapered face  206  of the chamfered lead-in  102  of the rearward notch  92  faces rearward. Accordingly, during rotation of the webbing assembly  36 , a forward edge  208  the rearward spring rail  124  may rotate against the tapered face  206  of the rear notches  92 . Likewise, a rearward edge  212  of the forward spring rail  122  may contact the tapered face  204  of the chamfered lead-in  102  of the forward notch  108 . In this embodiment, as the webbing frame  120  is driven into the forward and rearward notches  108  and  92 , the protruding portions  138 ,  142  of the forward and rearward spring rails  122  and  124  slide over the chamfered lead-ins  102  and are driven away from each other, effectively stretching the webbing frame  120  and the webbing straps  134  thereof. It is further noted that the stretching action can be effected by having a lead-in structure  96  on only one of the notches  92  or  108  of each side rail  46 . For example, the forward spring rail  122  could be set within a square notch having no lead in, and the rearward spring rail driven to slide over the chamfered lead-in  102  of the rearward notch  92  before registering within the rearward notch  92  to effect the stretching. Likewise, a forward notch  108  with a chamfered lead-in  102  juxtaposed with a square rearward notch  92  can accomplish the same stretching action. 
     The depicted embodiments present a webbing assembly  36  with webbing straps  134  and cross-webbing straps  176  installed on the webbing frame  120  prior to insertion into the subassembly  200 . It is noted that, for other embodiments, the webbing and cross-webbing straps  134  and  176  can be attached to the webbing frame  120  after installation into the subassembly  200 . 
     Also, the depicted embodiments present a single middle upright  76  and a single central girder  144 . It is understood that such depiction does non-limiting; that is, more than one middle upright that cooperate with more than one central girder for seat boxes of extended width in the y-direction is contemplated. 
     While the disclosure is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and described in detail. It is understood, however, that the intention is not to limit the application to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the disclosure as defined by the appended claims. 
     Persons of ordinary skill in the relevant arts will recognize that various embodiments can comprise fewer features than illustrated in any individual embodiment described above. The embodiments described herein are not meant to be an exhaustive presentation of the ways in which the various features may be combined. Accordingly, the embodiments are not mutually exclusive combinations of features; rather, the claims can comprise a combination of different individual features selected from different individual embodiments, as understood by persons of ordinary skill in the art. 
     References to “embodiment(s)”, “disclosure”, “present disclosure”, “embodiment(s) of the disclosure”, “disclosed embodiment(s)”, and the like contained herein refer to the specification (text, including the claims, and figures) of this patent application that are not admitted prior art. 
     For purposes of interpreting the claims, it is expressly intended that the provisions of 35 U.S.C. 112(f) are not to be invoked unless the specific terms “means for” or “step for” are recited in the respective claim.