Water level indicator

Claim 1

A water level indicator useful in a bathtub or the like comprising a wall member carrying means to fasten the indicator to a tub, an elongated float chamber depending from the wall, a float within the chamber, a rod secured to said float and slideably projecting through an opening in said wall, an alarm and a battery compartment associated with said wall, an electrical circuit interconnecting the alarm and the battery compartment and being provided with terminals at spaced locations about said opening, an inner surface of each terminal defining a portion of said opening, said terminals being electrically insulated from each other and forming a part of said wall, said rod being provided with an electrically conductive band along a relatively short portion of its length, the exposed surface of said rod other than at said band being non-conductive, said rod having a substantially uniform diameter throughout its length including both the electrically conductive band portion and the non-conductive portion thereof, said rod having a diameter corresponding very closely with that of said opening, so that as the tub is filled with water, the float and the rod will rise within said chamber and when the band reaches the level of the terminals, the electrical circuit will be closed and the alarm will sound.