
An upstanding panel member and plate are provided and include upstanding opposite side edges. One side edge of the panel member extends upwardly along and is secured to one side of the plate intermediate its upstanding side edges and the lower end of the panel member and plate rest upon and are anchored to a horizontal base plate. The edge of the panel member remote from the plate includes an upper end portion which is inclined upwardly and inwardly toward the plate, the upper marginal edge of t...











