Detectable warning plate

Abstract

A detectable warning plate having integrally cast lugs. The lugs may extend from the undersurface of the plate so that they can be entrapped within concrete during installation. The plate may define a vent hole through the plate above each lug to permit air to escape from beneath the dome plate during installation. The plate may include one or more integral support ribs that extend downwardly from the plate. The support ribs may extend around the plate near the periphery. The lugs may be extensions of the support ribs.

1 . A warning plate to be embedded in concrete comprising: 
 a main body having a top surface and a bottom surface, said main body including a plurality of protrusions extending upwardly from said top surface;    a plurality of lugs extending downwardly from said bottom surface, each of said lugs defining a through-hole of sufficient size to permit free flow of concrete through said through-hole of each of said lugs; and    wherein said main body defines at least one vent hole extending through said main body from said top surface to said bottom surface adjacent to each lug, whereby air is free to vent from beneath said plate during installation of said plate in concrete.    
   
   
       2 . The plate of  claim 1  wherein said plurality of lugs includes at least two lugs.  
   
   
       3 . The plate of  claim 2  further including a support rib extending downwardly from said bottom surface.  
   
   
       4 . The plate of  claim 2  further including a support rib extending downwardly from said bottom surface, said support rib extending near a periphery of the plate.  
   
   
       5 . The plate of  claim 4  wherein at least one of said lugs extends downwardly from said support ribs.  
   
   
       6 . The plate of  claim 1  wherein each of said vent holes is in substantial vertical alignment with a corresponding one of said through-holes.  
   
   
       7 . The plate of  claim 1  wherein said protrusions are of uniform shape and are regularly spaced over said top surface of said main body; and 
 wherein each of said protrusions includes a planar top surface, said planar top surface of each of said protrusions being textured.    
   
   
       8 . A detectable warning plate comprising: 
 a main cast body having a top surface and a bottom surface, said main cast body including a plurality of protrusions extending upwardly from said top surface;    at least one lug integrally cast with said main cast body extending downwardly from said bottom surface, said lug having an interlock segment spaced from said bottom surface a sufficient distance to permit free flow of concrete between said interlock segment and said bottom surface; and    at least one support rib integrally cast with said main cast body extending across a portion of said main cast body, said support rib extending downwardly from said bottom surface.    
   
   
       9 . The plate of  claim 8  wherein said support rib extends substantially around the plate near a peripheral edge of the plate.  
   
   
       10 . The plate of  claim 9  wherein said lug extends from said support rib, whereby said lug is supported at least in part by said support rib.  
   
   
       11 . The plate of  claim 10  wherein said main cast body defines at least one vent hole extending through said main cast body from said top surface to said bottom surface adjacent in substantial vertical alignment with said lug, whereby air is free to escape from beneath said plate during installation of said plate in concrete.  
   
   
       12 . The plate of  claim 11  further defined as including at least two lugs extending downwardly from said bottom surface, each of said lugs extending from said support rib.  
   
   
       13 . The plate of  claim 12  wherein said lugs are disposed on opposite sides of the plate.  
   
   
       14 . The plate of  claim 13  wherein each of said lugs is generally C-shaped having a pair of opposed ends extending from opposite ends of said interlock segment and being joined to said main cast body, whereby each of said lugs defines a central through-hole through which wet concrete may flow.  
   
   
       15 . A cast detectable warning plate to be embedded in concrete comprising: 
 a main body having a top surface and a bottom surface, said main body including a plurality of protrusions extending upwardly from said top surface, said protrusion being regularly space and of uniform size and shape, said main body including a support rib extending downwardly from said bottom surface, said support rib being integrally formed with said main body;    a plurality of lugs extending downwardly from said bottom surface, said lugs being integrally formed with said main body, each of said lugs defining a through-hole of sufficient size to permit free flow of wet concrete through said through-hole;    wherein said main body defines at least one vent hole extending through said main body from said top surface to said bottom surface adjacent to each through-hole, whereby air is free to escape from beneath said plate during installation of said plate in concrete.    
   
   
       16 . The plate of  claim 15  wherein said support rib extends along at least a portion of a periphery of said main body.  
   
   
       17 . The plate of  claim 16  wherein each of said lugs extends from said support rib.  
   
   
       18 . The plate of  claim 16  wherein each of said lugs is generally C-shaped having an interlock section and a pair of ends extending from opposite ends of said interlock section, said opposite ends being integrally joined with said main body.  
   
   
       19 . The plate of  claim 18  wherein each of said protrusions includes a top planar surface.  
   
   
       20 . The plate of  claim 19  wherein each of said top planar surfaces is textured to provide improved traction.