Patent ID: 6203163
Filing Date: 2001-03-20
Classification: A47F,F21S,F21W,Y10S

Abstract:
In combination with an article display case of the type which conventionally includes a base; a series of vertically spaced apart article support plates disposed in registry over said base; an elongated, transparent, hollow, liquid containing tube extending vertically upwardly from said base through said plates; and an air pump mounted on said base containing an air outlet port for connection to a base portion of said tube to pump air into a liquid contained in said tube to form air bubbles therein, an upper end of said tube communicating with atmosphere to disperse said bubbles from said liquid; an arrangement for protecting said air pump from damage due to a backup of said liquid into said pump when said pump is inactive comprisingan elongated hollow pipe disposed on one end thereof on said base and extending vertically upwardly parallel to and spaced apart from said tube beside said plates, andan air line connected on one end to said air outlet port and extending into a hollow shaft in a lower end portion of said pipe, thence upwardly in said shaft to a level above the surface of said liquid in said tube, thence back downwardly in said shaft to a base portion of said pipe, thence out of said pipe to an air inlet port on a base portion of said tube which communicates with said liquid.