Fluid handling – With means for separating solid material from the fluid – Planar strainer normal to flow path
Reexamination Certificate
2000-06-08
2001-04-17
Lee, Kevin (Department: 3754)
Fluid handling
With means for separating solid material from the fluid
Planar strainer normal to flow path
C251S040000, C210S429000, C210S431000
Reexamination Certificate
active
06216730
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 in which a single molded element provides both the filter and the bypass orifice. Since the filter and bypass is self-contained, it is essentially free floating with respect to the diaphragm, which allows for looser tolerances resulting in lower manufacturing costs. Thus, the present invention is specifically directed to a low cost solution to flush valve failures due to particulate matter obstructing the orifice and causing the flush valve to fail to close.
The filter and orifice are contained in a single component in the as-molded condition. As this component is assembled to the diaphragm, and a simple press-fit operation is performed, the assembly becomes functional with a filter ring moving toward the filter body to form the filter passages which communicate with the bypass orifice.
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, filter and bypass orifice in which the bypass orifice is formed integrally with the filter and the filter is attached at spaced locations to the underside of the diaphragm.
Another purpose of the invention is to provide a filter for the use described which consists, in an as-molded condition, of a filter body and a filter ring connected by frangible tabs which are broken in assembly as the ring moves to form the filter water passages during assembly.
Another purpose is to provide a low cost, efficient and reliable filter and bypass for use in the environment described.
REFERENCES:
patent: 5213305 (1993-05-01), Whiteside et al.
patent: 5332192 (1994-07-01), Whiteside
patent: 5335694 (1994-08-01), Whiteside
patent: 5887848 (1999-03-01), Wilson
patent: 5967182 (1999-10-01), Wilson
Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Lee Kevin
Sloan Valve Company
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