Covering apparatus for opening of underground pipeline or box

Abstract

A covering apparatus includes a seat assembly and a cover. The seat assembly includes at least a seat with a plurality of flights on an internal side. Each of the flights includes a plurality of steps. The cover includes, on a lower side along an edge, a plurality of flights corresponding to the flights of the seat. Each of the flights of the cover includes a plurality of steps corresponding to the steps of each of the flights of the seat. Various combinations of the steps of each of the flights of the cover can be positioned on related combinations of the steps of each of the flights of the seat so that the cover can be positioned on various levels on the seat.

1 . A covering apparatus comprising: 
 a seat assembly comprising at least a seat comprising a plurality of flights on an internal side, each of the flights comprising a plurality of steps; and    a cover comprising, on a lower side along an edge, a plurality of flights corresponding to the flights of the seat, each of the flights of the cover comprising a plurality of steps corresponding to the steps of each of the flights of the seat, wherein various combinations of the steps of each of the flights of the cover are positioned on related combinations of the steps of each of the flights of the seat so that the cover is positioned on various levels on the seat.    
   
   
       2 . The covering apparatus according to  claim 1  wherein both of the seat and the cover comprise at least three flights.  
   
   
       3 . The covering apparatus according to  claim 2  wherein both of the seat and the cover comprise eight flights.  
   
   
       4 . The covering apparatus according to  claim 1  wherein each of the flights of both of the seat and the cover comprises at least two steps.  
   
   
       5 . The covering apparatus according to  claim 4  wherein each of the flights of both of the seat and the cover comprises four steps.  
   
   
       6 . The covering apparatus according to  claim 1  wherein the cover defines a plurality of apertures through which hooks can be inserted for hooking the cover by a lower side.  
   
   
       7 . The covering apparatus according to  claim 1  wherein the cover defines a plurality of apertures through which fasteners can be inserted for securing the cover.  
   
   
       8 . The covering apparatus according to  claim 1  wherein the seat assembly comprises at least one ring positioned between the seat and the cover, the ring comprising, on and along a lower edge, a plurality of flights corresponding to the flights of the seat and, on an internal side, a plurality of flights corresponding to the flights of the cover.  
   
   
       9 . The covering apparatus according to  claim 8  wherein both of the seat and the ring comprise at least three flights.  
   
   
       10 . The covering apparatus according to  claim 8  wherein both of the ring and the cover comprise at least three flights.  
   
   
       11 . The covering apparatus according to  claim 8  wherein each of the flights of both of the seat and the ring comprises at least two steps.  
   
   
       12 . The covering apparatus according to  claim 8  wherein each of the flights of both of the ring and the cover comprises at least two steps.  
   
   
       13 . The covering apparatus according to  claim 8  wherein the seat comprises a flange on an external side, wherein the ring comprises, on an internal side, a flange corresponding to the flange of the seat, wherein the seat assembly comprises at least one brace for positioning the ring on the seat firmly.  
   
   
       14 . The covering apparatus according to  claim 14  wherein the seat assembly comprises at least one fastener for helping the brace clamping the flange of the seat and the flange of the ring.  
   
   
       15 . A covering apparatus comprising: 
 a seat assembly comprising a seat and at least one ring positioned on the seat, the ring comprising a plurality of flights on an internal side, each of the flights comprising a plurality of steps; and    a cover comprising, on a lower side along an edge, a plurality of flights corresponding to the flights of the ring, each of the flights of the cover comprising a plurality of steps corresponding to the steps of each of the flights of the ring, wherein various combinations of the steps of each of the flights of the cover are positioned on related combinations of the steps of each of the flights of the ring so that the cover is positioned on various levels on the ring.    
   
   
       16 . The covering apparatus according to  claim 15  wherein both of the ring and the cover comprise at least three flights.  
   
   
       17 . The covering apparatus according to  claim 15  wherein each of the flights of both of the ring and the cover comprises at least two steps.  
   
   
       18 . The covering apparatus according to  claim 15  wherein the seat comprises a flange on an external side, wherein the ring comprises, on an internal side, a flange corresponding to the flange of the seat, wherein the seat assembly comprises at least one brace for positioning the ring on the seat firmly.  
   
   
       19 . The covering apparatus according to  claim 15  wherein the seat assembly comprises at least one fastener for helping the brace clamping the flange of the seat and the flange of the ring.