Liquid purification or separation – Plural distinct separators – Filters
Reexamination Certificate
1999-06-15
2001-08-07
Walker, W. L. (Department: 1723)
Liquid purification or separation
Plural distinct separators
Filters
C210S323100, C210S445000, C210S446000, C210S448000, C210S451000, C210S452000, C210S455000, C264S209100, C264S248000, C264SDIG004, C264SDIG007
Reexamination Certificate
active
06270670
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject invention relates to a water filter assembly and method for fabricating same, particularly, a water filter assembly for domestic use.
2. Description of the Prior Art
A number of water filter assemblies are known for filtering tap water in the home. It is important that such assemblies be compact
SUMMARY OF THE INVENTION AND ADVANTAGES
A water filtration assembly comprising an elongated housing having an outer surface surrounding at least one filter chamber extending between first and second open ends. The outer surface has a housing recess therein adjacent each of the first and second ends of the housing and extends about the periphery of each end to define a recess end surface and a peripheral projection extending to a distal end from the recess end surface at each end of the housing. A first end cap covers the first end and a second end cap covers the second end. Each of the end caps has an end face with a periphery and a peripheral wall having an exterior surface extending from the periphery of the end face to an end surface, the peripheral wall and the end face defining an interior cavity with a bottom and interior wall surfaces. The end surface has an L-shaped cap recess therein with an axial leg and a transverse leg extending about the end face with the transverse leg opening into the interior cavity. The projection at the first end of the housing is disposed in engagement with the cap recess of the first cap as the end surface of the first cap abuts the recess end surface at the first end of the housing. The projection at the second end of the housing is disposed in engagement with the cap recess of the second cap as the end surface of the second cap abuts the recess end surface at the second end of the housing. The assembly is characterized by the exterior surface of each of the end caps being spaced outwardly of the outer surface of the housing to define a step between the outer surface of the housing and the exterior surface of each of the end caps.
The invention also includes the method of fabricating a water filtration assembly comprising the steps of forming an elongated housing having an outer surface surrounding at least one filter chamber extending between first and second open ends, forming a housing recess in the outer surface of the housing adjacent each of the first and second ends of the housing and extending about the periphery of each end to define a recess end surface and a peripheral projection extending to a distal end from the recess end surface at each end of the housing, forming a first end cap for covering the first end, forming a outlet end cap for covering the second end, forming each end cap with an end face having a periphery and a peripheral wall having an exterior surface extending from the periphery of the end face to an end surface to define an interior cavity with a bottom and interior wall surfaces, forming a L-shaped cap recess in each end surface with an axial leg and a transverse leg extending about the end face with the transverse leg opening into the interior cavity, forming a two sided shoulder filling the corner between the axial and transverse legs of the cap recess, inserting the projection at the first end of the housing into engagement with the cap recess of the first cap as the distal end of the projection abuts the shoulder in the cap recess at the first end of the housing, inserting the projection at the second end of the housing into engagement with the cap recess of the second cap as the distal end of the projection abuts the shoulder in the cap recess at the second end of the housing, and melting the respective shoulders into a fusion bond between the distal end of each projection and each of the transverse legs of the cap recesses.
The subject invention provides a specific construction which is compact, sturdy and free of leakage yet retains the feature of easy and rapid filter cartridge replacement.
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patent: 9-267092 (1997-10-01), None
Howard & Howard
Ocampo Marianne
Talhin/T Corp., Consumer Products Division
Walker W. L.
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