Drain trap and cover construction

Claim 1

A drain trap and cover construction comprising an open top bowl having a central passage therein; a marginal flange formed of non-metallic material extending outwardly from the upper edge of said bowl, said flange having a substantially cylindrical socket formed therein with a throat opening leading thereinto from the upper surface of said flange, said throat opening having a length corresponding to that of said socket and having a normal width less than the diameter of said socket, said flange having a channel in its upper surface extending from said socket to the upper edge of said bowl, said channel having a width less than the length of said socket and said socket extending at both ends thereof beyond said channel; a non-metallic cover for said bowl; and an integral tongue extending from said cover and terminating in a substantially cylindrical pivot pin rotatably accommodated in said socket, said tongue having a length, width and thickness corresponding substantially to the length, width and depth of said channel and said pivot pin having a length and diameter corresponding to the length and diameter of said socket but having a diameter greater than the width of said throat opening, the material from which said flange is formed having sufficient resilience to enable said pivot pin to enlarge the width of said throat opening to permit passage of said pivot pin into said socket, following which said throat opening returns to its normal width to retain said pin in said socket, the upper surfaces of said flange, said cover, said tongue, said pivot pin being substantially flush when said cover is in its bowl-closing position.