Fluid handling – With means for separating solid material from the fluid – Planar strainer normal to flow path
Reexamination Certificate
2000-05-30
2001-07-17
Rivell, John (Department: 3753)
Fluid handling
With means for separating solid material from the fluid
Planar strainer normal to flow path
C251S040000
Reexamination Certificate
active
06260576
ABSTRACT:
THE FIELD OF THE INVENTION
Diaphragm-type flush valves for use on toilet devices such as urinals and water closets have conventionally had a filter and a bypass orifice to connect the flush valve inlet with the pressure chamber above the diaphragm. The purpose of the filter and the bypass is to provide a water passageway of limited size to permit the pressure chamber to fill, insuring closure of the flush valve by movement of the diaphragm onto its valve seat. There have been numerous prior art disclosures relating to the filter and the diaphragm. Such disclosures include U.S. Pat. Nos. 5,213,305, 5,332,192, 5,887,848 and 5,967,182, all assigned to Sloan Valve Company of Franklin Park, Ill., the assignee of the present application. The prior art listed in such patents also show many forms of diaphragm filters and bypass orifices.
The present invention is specifically directed to an improvement in the filter and bypass portion of the diaphragm and more specifically to an improved diaphragm assembly which places the filter and the bypass orifice generally intermediate to the diaphragm periphery and that portion of the diaphragm which closes upon the flush valve seat. The filter includes a filter ring which is positioned within a downwardly-facing recess in the dynamic portion of the diaphragm, with the filter ring having a plurality of small passages connected to a peripheral or circumferential trough. The trough faces upwardly within the diaphragm recess and the orifice is formed within the body of the flexible diaphragm in alignment with the recess. The dynamic movement of the flexible diaphragm will insure that the orifice is self-cleaning. The simply constructed filter ring and its location and attachment to the diaphragm provides a low-cost, efficient and reliably operable filter and orifice to insure continued and consistent operation of the flush valve.
SUMMARY OF THE INVENTION
The present invention relates to flush valves for use on urinals and water closets and more specifically to an improved valve assembly therefor.
A primary purpose of the invention is a diaphragm assembly for the use described, including an improved filter and bypass orifice.
Another purpose of the invention is to provide a diaphragm having a self-cleaning orifice and a filter ring associated therewith which is located generally at the dynamic portion of the flexible diaphragm.
Another purpose of the invention is to provide a reliable, low cost and efficient diaphragm assembly for use in a flush valve of the type described.
Another purpose of the invention is an improved diaphragm assembly for a toilet flush valve, with the diaphragm having a downwardly facing peripheral recess in which is positioned a filter ring having multiple passages which connect the flush valve inlet with an orifice in the diaphragm located in alignment with its recess.
Other purposes will appear in the ensuing specification, drawings and claims.
REFERENCES:
patent: 2776812 (1957-01-01), Colendar
patent: 2916251 (1959-12-01), Butts
patent: 3279742 (1966-10-01), Billeter
patent: 4261545 (1981-04-01), Allen
patent: 4327891 (1982-05-01), Allen et al.
patent: 5213305 (1993-05-01), Whiteside et al.
patent: 5332192 (1994-07-01), Whiteside
patent: 5335694 (1994-08-01), Whiteside
patent: 5881993 (1999-03-01), Wilson et al.
patent: 5887848 (1999-03-01), Wilson
patent: 5967182 (1999-10-01), Wilson
patent: 6182689 (2001-02-01), Lauer et al.
Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Rivell John
Sloan Valve Company
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