Discussing FIG. 4, for structure members 160, 160 the rollers 110 a, 110 b are positioned usually midway alongside a entire frame participant. Framework participants 160, 160 may include decreased level regions 161, 161 between your set of rollers 110 a, 110 b and every finish of framework fellow member 160. Each stop 160 a, 160 b of each body member 160 is welded to one of several pair of typically longitudinally focused frame participants 124. While these lessened elevation locations 161, 161 are to supply clearance for belt 112 (FIG. 2), they can also be employed to lessen the rigidity or springtime rate of your framework participant to produce the required firmness or springtime rate. Frame participants 160 are about 18.3 in . lengthy.

Referring to FIG. 6, for body associates 162, 162 the rollers 110 a, 110 b may also be placed normally midway coupled a entire frame member. Every stop 162 a, 162 b for each frame member 162 is slotted as at 163 to accommodate a specific one of the cross bands 152, 156 or154 and 158, and is welded thereto. Structure associates 162 are about 17.75 ins extended.

Discussing FIG. 7, for body associates 164, 164 and 166, 166 the rollers 110 a, 110 b are placed around one end in the body associate, because of the wish to equally space the rollers throughout the framework 120 and because of geometric limitations imposed through the several other structure people in the body 120. Because locating the rollers 110 a, 110 b in close proximity to one end in the framework associate creates a greater firmness or springtime level, a lower level place for frame associate 164 and 166 is desired to lower the stiffness or springtime level to generally go with that of one other framework members 160, 162. To that conclusion, a reduced height region 167 is included upon an uppr aspect as well as that stop 164 a from the body associate 164, i.e. involving the rollers 110 a, 110 b and also the link to adjoining composition, which in such a case is amongst the set of usually longitudinally focused frame people 124. Stop 164 a includes a further more lessened height area over a decrease part thereof by means of a degree 169 that is backed with a tang 170 which is welded on the typically longitudinally driven frame associate 124. Stop 164 a is welded to tang 170 as well as to frame participant 124. Another stop 164 b of frame fellow member 164 is slotted as at 171 to accommodate a particular one of several cross straps 156, 154, 152 and 158 and is also welded thereto. Structure people 164 and 166 are about 13 in . very long.