items as hereinafter described as shown in fig3 and 4 the outer edges of the stage surface members 32 and 34 have interlock members attached thereto the members include male members 190 which lock with female members 192 of an adjacent stage to form a large planar surface the stage surface members 32 and 34 are hingably connected to each other along one edge by means of hinge assemblies as shown in fig3 and 9 13 three center hinge assemblies provide bracing and guide the stage surface members 32 and 34 during folding the hinge assemblies have links 176a 176b and 176c attaching to stage surface member 32 and similarly links 178a 178b and 178c attaching to stage surface member 34 the corresponding links attach at center pivots 180a 180b and 180c respectively the center pivots 180a 180band 180c also connect to center links 182a 182b 182c and 184a 184b 184c respectively center links 182a 182b and 182c rigidly attach to the underside of stage surface member 32 along the center edge similarly center links 184a 184b and 184c attach to stage surface member 34 with this arrangement the stage surface members 32 and 34 are hinged about pivots 180a 180b and 180c during folding the stage surface members are adjusted relative to one another by spacing bolt 186 shown in fig1 the spacing bolt 186 can be adjusted to increase and decrease the spacing of the stage surface members along the center hinge as shown in fig1 a pair of hinge plates 66a and.