extending arc as hereinbefore noted by virtue of the rigid connection between the strap ends and the stanchions the flexure is maintained even when a load is applied to the bed referring again to the drawing and in particular fig2 and 4 there is illustrated a cover 90 for the strap 32 the cover 90 is snap fitted to the strap 32 the cover 90 promotes structural integrity for the strap while being aesthetically pleasing as shown in the drawing the cover 90 has an irregular configuration the cover 90 includes a flange 92 which tucks beneath the projecting leg 76 a sloped wall 94 extends upwardly and radially inwardly from the flange and terminates at a substantially flat planar wall 96 which overlies the central u shaped section 62 and tab receiving channel sections 66 a leg 98 depends downwardly from the free end of the wall 96 and terminates at an arcuate end 100 the leg 98 engages and is snap fitted to the channel section 66 the leg 98 is provided with a notch or cut out section 102 the notch 102 circumscribes the leg 56 of the means 34 thus when the cover 90 is snap fitted into position the notch 102 engages the arm 56 and thus locks it in position it is to be thusly seen that the cover 90 also defines.