Isolation pocket form with closure

Abstract

An isolation pocket form includes a wall assembled from wall segments having reinforcing ribs. The form is secured to a floor with clips having projections which engage holes in the periphery of the form. A removable closure seats on an interior ledge of the form, the ledge being situated so that the top of the closure is flush with the top of the form. The closure is reinforced by a two-dimensional array of reinforcing ribs to give it strength and rigidity.

I claim:  
     
         1 . An isolation pocket form comprising 
 a wall bounding a closed area and having a substantially planar upper edge,    means forming a ledge on the inside surface of the wall, a uniform distance below said upper edge, and    a removable closure shaped like the closed area and sized to fit closely within the wall and to seat upon said ledge, the closure having a planar top surface,    the closure having a thickness equal to said uniform distance,    whereby the closure the top surface of the closure is substantially flush with said planar upper edge when the closure is seated upon said ledge.    
     
     
         2 . The invention of  claim 1 , wherein the closed area is polygonal and the wall comprises a plurality of wall segments interconnected to one another.  
     
     
         3 . The invention of  claim 1 , wherein each of said wall segments has external reinforcing ribs.  
     
     
         4 . The invention of  claim 1 , wherein the closure has peripheral flanges and an array of reinforcing ribs to give the top strength and rigidity.  
     
     
         5 . The invention of  claim 4 , wherein said array is two-dimensional.  
     
     
         6 . The invention of  claim 1 , further comprising clips for securing the form to a floor.  
     
     
         7 . The invention of  claim 6 , wherein the form has a plurality of holes at its external bottom periphery, and each of the clips has a base for engaging the floor, a plateau portion offset upward from said base, and a project depending downward from said plateau for engaging within one of said holes.