Trash receptacle with vacuum breaking means

Claim 1

A trash receptacle for receiving a flexible, removable plastic liner, comprising: (a) said receptacle being upstanding and having an open top and a closed bottom and an impervious side wall; (b) said bottom having an outer peripheral area and a central area; (c) said bottom having an inside surface and an outside surface; (d) said central area having a concavity in said outside surface; (e) said peripheral area providing principal support means for said receptacle when positioned upright on a support surface; (f) said central area having a vent extending from said inside surface to said outside surface of said bottom; (g) said bottom inside surface i the area of said vent having a smooth surface; (h) valve means for sealing said vent and including a flexible circular diaghragm and means for securing said diaphragm against said smooth inside surface in the area of said vent; (i) said vent including means engageable with said diaphragm securing means for securing said valve means in said vent and for maintaining said flexible diaphragm when positioned in said vent in normal sealable engagement with said inside surface of said bottom; (j) said diaphragm having a concavity facing said smooth inside surface; (k) said circular diaphragm having its entire periphery engageable with said smooth inside surface and under compression at all times to form a seal between said diaphragm and said smooth surface to prevent fluid from escaping from inside the bottom of the receptacle to the exterior of the receptacle under normal loading of trash in said liner; and (1) said diaphragm being sufficiently flexible so that said diaphragm will disengage from said smooth surface when a flexible liner positioned in said trash receptacle and which clings to the receptacle wall is lifted for the purposes of removal to permit air to enter into and pass from the outside through said vent thereby breaking the suction created upon removal of said liner.