Grating for waste trenches

Claim 1

THE COMBINATION OF A TRENCH, A GRATE IN COVERING RELATION OVER SAID TRENCH, PLURAL, SUBSTANTIALLY PARALLEL RAILS IN SAID GRATE SPACED LATERALLY FROM EACH OTHER HAVING FREE, UNJOINED ENDS DEFINING OPPOSED SIDE MARGINS OF THE GRATE, BARS IN SAID GRATE JOINING SAID RAILS AT POINTS DISPOSED INWARDLY FROM THE FREE ENDS OF SAID RAILS, MULTIPLE EDGES DEFINING THE FREE END OF EACH OF SAID RAILS, SAID MULTIPLE EDGES INCLUDING AN UPPER EDGE THAT INCLINES FROM A VERTICAL PLANE INWARDLY TOWARD THE MIDDLE OF THE GRATE PROGRESSING DOWNWARDLY FROM THE TOP OF THE GRATE, AND A LOWER EDGE JOINING WITH THE BASE OF SAID UPPER EDGE WHICH INCLINES FROM A VERTICAL PLANE INWARDLY TOWARD THE MIDDLE OF THE GRATE PROGRESSING IN A DOWNWARD DIRECTION AT A GREATER ANGLE THAN DOES SAID UPPER EDGE, AND OPPOSED LEDGE ELEMENTS SEPARABLE FROM THE GRATE MOUNTED ALONG OPPOSITE SIDES OF THE TRENCH, SAID LEDGE ELEMENTS BEING ANCHORED IN PLACE, EACH OF SAID LEDGE ELEMENTS INCLUDING AN UPPER SEATING SURFACE THAT HAS AN INCLINE COMPLEMENTING THE INCLINE OF SAID UPPER EDGE DEFINING THE FREE END OF A RAIL, AND A LOWER SEATING SURFACE THAT HAS AN INCLINE COMPLEMENTING THE INCLINE OF SAID LOWER EDGE DEFINING THE FREE END OF A RAIL, SAID UPPER SEATING SURFACES OF THE OPPOSED LEDGE ELEMENTS SEATING BY DIRECTLY SUPPORTING THE FREE ENDS OF SAID RAILS WITH SAID FREE ENDS WEDGED INTO PLACE.