Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Reexamination Certificate
2001-04-27
2003-03-25
Chambers, A. Michael (Department: 3753)
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
C137S557000, C137S505250, C137S545000, C138S045000, C004S314000
Reexamination Certificate
active
06536470
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to valve devices and more particularly pertains to a new back flow prevention valve for preventing water from draining back into a water supply line.
2. Description of the Prior Art
The use of valve devices is known in the prior art. More specifically, valve devices heretofore devised and utilized are known to consist basically of familiar, expected and obvious structural configurations, notwithstanding the myriad of designs encompassed by the crowded prior art which have been developed for the fulfillment of countless objectives and requirements.
Known prior art includes U.S. Pat. No. 5,065,786; U.S. Pat. No. 5,562,970; U.S. Pat. No. 5,944,055; U.S. Pat. No. 5,02,060; U.S. Pat. No. 4,230,145; and U.S. Des. Pat. No. 285,716.
While these devices fulfill their respective, particular objectives and requirements, the aforementioned patents do not disclose a new back flow prevention valve. The inventive device includes a housing comprising a tubular body having a peripheral wall extending between a first end and a second end. Each of the first and second ends define an edge of an opening. A first covering is positioned over the first end of the tubular body has an aperture extending therethrough. A water supply pipe is fluidly coupled to the aperture. An elongated annular lip is coupled to the the first covering and extends inward of the tubular body and defines a cylinder. A cap covers the annular lip and has an opening extending therethrough. A piston is slidably positioned in the cylinder. The piston has a bore extending therethrough along a longitudinal axis of the piston. A biasing member biases the piston toward the aperture in the first covering. A second covering is positioned over the second end of the tubular body. The second covering has an aperture extending therethrough positioned generally co-axial with the aperture in the first covering for allowing water to flow outwardly of the tubular member. The aperture in the second covering has a ledge therein. A one-way valve is removably coupled to a proximal end of the piston with respect to the second covering. The one-way valve is adapted for letting water move outwardly through the piston toward the second end of the tubular member. The one-way valve has a size adapted for extending into the aperture in the second covering. The one-way valve is extendable between an open position retracted inward of the piston and a closed position extending outward of the piston. The one-way valve is abuttable against the ledge such that the one-way valve is moved into the open position, wherein water may flow through the piston and outward through the second covering.
In these respects, the back flow prevention valve according to the present invention substantially departs from the conventional concepts and designs of the prior art, and in so doing provides an apparatus primarily developed for the purpose of preventing water from draining back into a water supply line.
SUMMARY OF THE INVENTION
In view of the foregoing disadvantages inherent in the known types of valve devices now present in the prior art, the present invention provides a new back flow prevention valve construction wherein the same can be utilized for preventing water from draining back into a water supply line.
The general purpose of the present invention, which will be described subsequently in greater detail, is to provide a new back flow prevention valve apparatus and method which has many of the advantages of the valve devices mentioned heretofore and many novel features that result in a new back flow prevention valve which is not anticipated, rendered obvious, suggested, or even implied by any of the prior art valve devices, either alone or in any combination thereof.
To attain this, the present invention generally comprises a housing comprising a tubular body having a peripheral wall extending between a first end and a second end. Each of the first and second ends-define an edge of an opening. A first covering is positioned over the first end of the tubular body has an aperture extending therethrough. A water supply pipe is fluidly coupled to the aperture. An elongated annular lip is coupled to the first covering and extends inward of the tubular body and defines a cylinder. A cap covers the annular lip and has an opening extending therethrough. A piston is slidably positioned in the cylinder. The piston has a bore extending therethrough along a longitudinal axis of the piston. A biasing member biases the piston toward the aperture in the first covering. A second covering is positioned over the second end of the tubular body. The second covering has an aperture extending therethrough positioned generally co-axial with the aperture in the first covering for allowing water to flow outwardly of the tubular member. The aperture in the second covering has a ledge therein. A one-way valve is removably coupled to a proximal end of the piston with respect to the second covering. The one-way valve is adapted for letting water move outwardly through the piston toward the second end of the tubular member. The one-way valve has a size adapted for extending into the aperture in the second covering. The one-way valve is extendable between an open position retracted inward of the piston and a closed position extending outward of the piston. The one-way valve is abuttable against the ledge such that the one-way valve is moved into the open position, wherein water may flow through the piston and outward through the second covering.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are additional features of the invention that will be described hereinafter and which will form the subject matter of the claims appended hereto.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
Further, the purpose of the foregoing abstract is to enable the U.S. Patent and Trademark Office and the public generally, and especially the scientists, engineers and practitioners in the art who are not familiar with patent or legal terms or phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
It is therefore an object of the present invention to provide a new back flow prevention valve apparatus and method which has many of the advantages of the valve devices mentioned heretofore and many novel features that result in a new back flow prevention valve which is not anticipated, rendered obvious, suggested, or even implied by any of the prior art valve devices, either alone or in any combination thereof.
It is another object of the present invention to provide a new back flow prevention valve which may be easily
Carn Wayne J.
Murray Eric
Sawford Russell J.
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