Dispensing – Gas or vapor dispensing
Patent
1990-05-10
1991-12-31
Huppert, Michael S.
Dispensing
Gas or vapor dispensing
222 54, 222 65, 222 67, 2221465, 392324, B67D 500
Patent
active
050764675
ABSTRACT:
A dental washer includes a heating vessel for heating a washing liquid by an electrical heater to generate superheated steam, so electromagnetic pump on a water supply pipe communicating with the heating vessel and a water source, an electromagnetic valve in a steam pipe having at its one end a nozzle for outputting steam and communicating with the nozzle and a superheated steam-filling region of the heating vessel and a level detector for detecting the level of the washing liquid in the heating vessel to turn the electrical heater on when the level reaches the preset upper limit and turn it off when the level reaches the preset lower limit. The dental washer further includes an initial valve-opening circuit energized upon a main switch turned on to hold the electromagnetic valve open, a valve-closing circuit for holding the electromagnetic valve closed in response to a signal from the level detector when the level of the washing liquid in the heating vessel reaches the preset upper limit and keeping it closed, and a manual valve-controlling switch for steam which holds open or closed the electromagnetic valve held closed by the valve-closing circuit.
REFERENCES:
patent: Re18993 (1933-11-01), Field
patent: 3665156 (1972-05-01), Lee
patent: 3749092 (1973-07-01), Williams
patent: 3786829 (1974-01-01), Nordo et al.
patent: 4274553 (1981-06-01), Evers et al.
patent: 4327459 (1982-05-01), Gilbert
patent: 4370543 (1983-01-01), Nemeth
patent: 4675505 (1987-06-01), Fischer
patent: 4836145 (1989-06-01), Ronchi
DeRosa Kenneth
G-C Dental Industrial Corp.
Huppert Michael S.
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