as shown in the drawings , the present invention can be utilized to produce a multitude of different furniture designs using only a relatively small amount of construction pieces . more specifically , the present invention employs a main element 16 ( see fig1 and 2 ) as well as a fastening element 24 ( see fig1 and 20 ) for connecting two of the main elements 16 together . these elements 16 and 24 can be used with a plurality of support or planar elements 26 ( see fig1 ) which are used to produce different pieces of furniture , such as chairs , tables , platforms and the like . the main element 16 is constructed primarily in the shape of an elongated &# 34 ; c &# 34 ; provided with a longitudinal section 18 as well as two relatively short sections 20 , 22 which are transverse to the longitudinal section 18 . rounded corners 19 , 21 are provided between the longitudinal section 18 and the transverse sections 20 , 22 to avoid injury . a central rib 8 extends along the length of the longitudinal portion 18 ( see fig4 , 14 and 15 ) and gives rigidity to the main element 16 in combination with a secondary rib 9 which extends along the edge of the main element 16 as well as along part of the edges of the portions 20 , 22 . these ribs 8 and 9 are used to save material in the construction of the present invention to allow the present invention to be as inexpensive as possible . the distal portions of each of the sections 20 , 22 which extend beyond the rib portion 9 , would then be recessed from the outer periphery of the main element 16 to form a seat 1 . these portions are utilized as supports when joining two of the main elements 16 together . each of these seating sections is provided with a guiding hole 3 into which the fastening elements 24 will be inserted . two additional guiding holes 3 are provided in the rounded corner portions 19 , 21 provided between the longitudinal portion 18 and the two transverse portions 20 , 22 . axial guide holes 2 are located on either side of the rounded corner portions 19 , 21 , the guide holes extending completely through the main element 16 . these axial guide holes 2 are utilized as receptacles for various wheels 30 having a rigid member 32 extending therefrom ( see fig2 ). these wheels will be utilized when the constructed furniture is a moveable costume holder , a mobile screen or the like , allowing the furniture to be moved . alternatively , these axial guide holes can be used as receptacles for pins or bolts at fixed platforms to form support surfaces such as tabletops or stages . a first guide groove 5 traverses the longitudinal portion 18 of the main element 16 , and is located at both exterior faces of the longitudinal portion 18 . this groove 5 is utilized to support platforms 26 , such as the seat of a chair or the board of a screen ( see fig1 ). a slot 28 is provided in the platform 26 to extend into the groove 5 . a second groove 4 extends between two of the secondary ribs 9 , which longitudinally extend in the longitudinal portion 18 , as shown in fig2 and 7 . this groove 4 is used in combination with various platforms that operate as shelves or tops for joining two main elements together . a vertical slot 7 is used to slide a portion of the platform therethrough and into engagement with the groove 4 . horizontal slots 6 are provided in each of the portions 20 , 22 . these slots 6 provide , with the use of narrow platforms , more rigidity to the coupling main elements . this is made possible by introducing the ends of the various platforms into the slot 6 and sliding its gridwork until it is secured into the main element . fig2 a , 20b , 20c and 20d illustrate the fastening element 24 of the present invention . the fastening element consists essentially of a tower 11 having a lower cylindrical body 12 as well as a top portion 15 through which a pin 14 is inserted . this pin is provided between two arms of a lever member 10 which rotates around the tower 11 . two lower sections 13 are attached to the cylinder 12 to form a key shape which is similar to the shape of the guiding holes 3 . the method of affixing two main elements together utilizing the fastening element 24 is shown in fig1 and 19 . initially , transverse elements 20 of two main elements 16 are joined together utilizing the recessed seat 1 of each of the transverse members 20 . in this manner , the guiding hole 3 of each of the seats 1 is aligned . thereafter , with the lever portion 10 of the fastening member 24 in a raised position , bottom elements 13 , when they are properly aligned with the slots in the guiding hole 3 , are inserted into the guiding hole 3 of one main element 16 , as well as a second main element ( see step 2 ). at this point , the lever element is rotated 90 ° to the left or to the right until the bottom elements 13 engage the element wall ( see step 3 ). finally , as shown in step 4 , the lever element 10 is lowered to maintain pressure over the walls of the transverse member 20 to ensure that both of the main elements are joined together . fig1 illustrates various types of furniture which can be constructed utilizing the construction elements of the present invention as described . as shown , chairs can be constructed employing the construction elements of the present invention , as well as a bottom support surface and a back support surface . additionally , a table can be constructed utilizing a support surface provided over a plurality of pairs of main elements . a costume or clothes hanger can be constructed employing four pairs of main elements , two of which are affixed to the top of another pair of elements . a longitudinal pole extends between the tops of two pairs of main elements . additionally , a shelving unit can be created using two pairs of opposed main elements provided with a number of shelving units . a stage can be developed using a number of main elements as the base of the stage as well as a number of support platforms . finally , fig1 shows a plurality of screens created by affixing support elements to pairs of opposed main elements . the invention has been described with reference to the illustrated and presently preferred embodiments . it is not intended that the invention be unduly limited by this disclosure of the presently preferred embodiments . instead , it is intended that the invention be defined by the means , and their obvious equivalents , set forth in the following claims :
a modular furniture construction system employing a main body element consisting of a longitudinal element as well as two secondary body elements extending transversely from the longitudinal element . each of the secondary body elements is provided with a key - shaped guiding hole in which a fastening device is inserted adapted to join two main body elements together . these main body elements can be joined together in a number of different ways to form , along with one or more support element , various pieces of furniture , such as chairs , tables , desks shelves and other similar devices .