referring now to the drawings , and first to fig1 , there is shown a bed foundation 10 of the present invention in an unassembled state . the bed foundation 10 includes at least two longitudinal members 12 , at least two transverse members 14 , a plurality of cross members 16 , and at least one top panel 18 . preferably , the longitudinal members 12 are configured to have an i - beam construction , with an upper portion 20 , a lower portion 22 and a middle portion 24 , the upper and lower portions 20 , 22 being thicker than the middle portion 24 . additionally , the longitudinal members 12 preferably include end portions 26 that are thicker than the middle portion 24 , thereby framing the middle portion 24 in a panel - like fashion . the i - beam construction of a longitudinal member 12 is shown in fig3 . the upper portions 20 of the longitudinal members 12 also include upper surfaces 28 that define a plurality of notches or grooves 30 . the grooves 30 are arranged and sized to accommodate the cross members 16 . the arrangement of the grooves 30 is such that the grooves 30 of adjacent longitudinal members 12 align with each other to receive a cross member 16 that is perpendicular to the length of the longitudinal member 12 . the grooves 30 are sized such that when the cross members 16 are placed in the grooves 30 , top surfaces 32 of the cross members 16 are substantially flush with the upper surfaces 28 of the longitudinal members 12 receiving the cross members 16 . this configuration is best shown in fig2 . though any rigid materials , including plastic , may be used , the longitudinal members 12 are preferably made of wood . more preferably , the upper portions 20 , lower portions 22 , and end portions 26 , are made of a relatively inexpensive material such as pine . the middle portions 24 , are preferably made of mdf , particle board , or plywood . similar to the construction of the longitudinal members 12 , the transverse members 14 , seen in fig4 , are preferably configured to have an i - beam construction , with an upper portion 34 , a lower portion 36 and a middle portion 38 , the upper and lower portions 34 , 36 being thicker than the middle portion 38 . additionally , the transverse members 14 preferably include end portions 40 that are thicker than the middle portion 38 , thereby framing the middle portion 38 in a panel - like fashion . like the longitudinal members 12 , any rigid materials , including plastic , may be used to construct the transverse members 14 . however , the transverse members 14 are preferably made of wood . more preferably , the upper portions 20 , lower portions 22 , and end portions 26 , are made of a relatively inexpensive material such as pine . the middle portions 24 , are preferably made of mdf , particle board , or plywood . the construction of the transverse members 14 may be identical to the construction of the longitudinal members 12 . fig3 shows a longitudinal member 12 of solid construction whereas fig4 shows a transverse member 14 having a panel construction . one skilled in the art will realize that the construction shown in fig3 may apply to transverse members 14 just as the panel construction of fig4 may apply to longitudinal members . the cross members 16 are substantially straight pieces sized to rest within the grooves 30 such that the top surfaces 32 of the cross members 16 are substantially flush with the upper surfaces 28 of the longitudinal members . though a variety of cross member widths , and inter - cross - member spacing , may be used to accomplish the present invention , consideration should be given to the structural integrity of the resulting foundation 10 . thus , narrow cross members should be accompanied by relatively small spacing between cross members , thereby resulting in the use of more cross members . conversely , wider cross members might accommodate larger inter - cross - member spacing . these considerations are important to ensure a sufficiently rigid surface , thereby preventing unwanted noises , and to reduce the chances of a puncture in one of the top panels 18 . any rigid material may be used to form the cross members 16 . preferably , the cross members 16 are wood . more preferably , the cross members 16 are a cost effective wood such as pine . the top panels 18 are planar pieces that rest on the upper surfaces 28 of the longitudinal members 12 , the top surfaces 32 of the cross members 16 , and on upper surfaces 42 of the transverse members 14 . the top panels 18 are flat , rigid pieces that are preferably resistant to warping , such as extruded plastic or more preferably , plywood or particle board . the thickness and strength of the top panels 18 should also be considered when determining the optimal spacing between the cross members . thicker top panels 18 can be used in conjunction with fewer cross members . though cardboard has been discussed as undesirable , given the appropriate number of cross members , closely spaced , cardboard could function adequately to be considered within the scope of the invention . in an assembled state , as is shown in fig2 with the exception of one of the top panels 18 , the various components of the foundation 10 are held together with fasteners 44 . any suitable fasteners are acceptable . preferably , the fasteners 44 are screws , nails , pins , bolts , biscuits , glue , or the like . the fasteners 44 are shown connecting the transverse members 14 to the longitudinal members 12 . additionally , any type of fastener 44 may be used to secure the cross members 32 to the transverse members 14 , and / or the top panels 18 to any or all of the members 12 , 14 , and 16 . the use of these fasteners 44 , as well as the structural integrity provided by the grooves 30 , allow the foundation 10 to be constructed at a location other than the factory in which the individual pieces are manufactured . additionally , shipping costs are greatly reduced as the various members 12 , 14 and 16 , may all be packaged together in a compact package . the queen - sized embodiment , shown in fig1 and 2 , has a shipping package size of approximately 78 × 30 . 25 × 3 . 75 inches . more importantly , the length of the package into which the foundation fits is less than 108 inches in length and less than 165 inches in length and girth combined . girth is defined as the distance around the package at its widest point in a direction perpendicular to the length . the length being the longest side of the package . therefore , the package is can be shipped using commercial shipping companies such as united parcel service of america , inc . ( ups ). packages exceeding 108 inches in length and 165 inches in length plus girth require special , more expensive , courier services . the queen - sized embodiment of the foundation 10 shown in fig1 and 2 includes three longitudinal members 12 , two transverse members 14 , and a plurality of cross members 16 that span the entire width of the foundation 10 . though this embodiment of the foundation 10 could be resized to any bed size , a preferred embodiment of a king - sized foundation 10 is shown in fig5 . the foundation 10 of fig5 is completely assembled and inverted to show its various components . not unlike many convention box springs , the king - sized foundation 10 of fig5 includes two smaller subfoundations 10 a and 10 b juxtaposed to form a larger foundation 10 . these subfoundations 10 a and 10 b also serve individually as twin - sized foundations . thus , the cross members 16 span the entire widths of the smaller foundations 10 a and 10 b , but do not span the width of the entire foundation 10 . because the widths of the individual subfoundations 10 a and 10 b are smaller than the queen - sized foundation , the center longitudinal member may be replaced with a joist member 46 . the joist member 46 is less expensive than the longitudinal members 12 as it does not have i - beam construction and is smaller . the joist member 46 is supported at the ends of the subfoundations 10 a and 10 b by braces 48 attached to the transverse members 14 . the joist member 46 has grooves 50 that match the grooves 30 of the longitudinal members 12 and that are sized to accept the cross members 16 . like the queen - sized embodiment , the king - sized foundation 10 of fig5 saves on shipping costs by being able to fit into a package that is not oversized . each subfoundation 10 a and 10 b , in an unassembled state , can be placed into a single container having a shipping package size of approximately 78 × 39 × 2 . 06 inches . more importantly , the length of the package into which the foundation fits is less than 108 inches in length and less than 165 inches in length and girth combined . therefore , the package is can be shipped using commercial shipping companies such as united parcel service of america , inc . ( ups ). packages exceeding 108 inches in length and 165 inches in length plus girth require special , more expensive , courier services . the invention has herein been described in its preferred embodiments to provide those skilled in the art with the information needed to apply the novel principles and to construct and use the embodiments of the examples as required . however , it is to be understood that the invention can be carried out by specifically different devices and that various modifications can be accomplished without departing from the scope of the invention itself , which is set out in the following claims :
a bed foundation capable of being assembled by the end user or a retailer . the bed foundation utilizes support members having i - beam construction , thereby reducing noise and greatly increasing the strength of the foundation . the foundation is also constructed to provide a flush , uniform top surface onto which top panels are attached . the flush uniform top surface also contributes to noise reduction and increased strength . the foundation , when unassembled , can be packed into a single , relatively small container , thereby significantly reducing shipping costs .