Liquid purification or separation – With repair or assembling means
Reexamination Certificate
1999-04-29
2001-06-05
Barry, Chester T. (Department: 1724)
Liquid purification or separation
With repair or assembling means
C210S348000
Reexamination Certificate
active
06241885
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to the filter chamber having a plurality of annular filter elements located therein for filtering liquids.
2. Description of the Prior Art
Hollow cylindrical filter elements have been used for filtering liquids such as water, acids, etc. to remove waster materials therefrom.
The lengths of these filter elements obtained commercially vary for example as much as ½ of an inch.
Known prior art devices have employed a plurality of these elements in a filter chamber. Some of these prior art devices use rods secured to a lower manifold and which rods extend through the filter elements. Nuts are provided with an annular knife edge that are screwed to the upper ends of the rods, and which forms seals with the upper ends of the filter elements. The use of rods which extend through the filter elements results in a large pressure drop between the inlet and outlet which requires a large pump to pump the liquid through the filter device. Other known prior art devices use individual plastic springs for urging closure means with annular knife edges against the upper ends of the annular filters for closing the top openings thereof. These springs, however, tend to break and are difficult to replace.
U.S. Pat. Nos. 1,941,895, 4,052,317, 4,725,323, 4,728,421, 5,173,186, and 5,770,066 discloses other prior art filter apparatus.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a new and useful filter apparatus which employs a plurality of annular filter members in a housing chamber with a new and useful arrangement for effectively holding the plurality of annular filter elements in place in the housing chamber.
The apparatus comprises a housing having an inlet and an outlet. The apparatus uses a single central rod coupled to one end of the housing. A support member is coupled to the other end of the rod. The support member has a plurality of threaded apertures extending therethrough through which threaded members are screwed for use for holding the filter members in place. The support member and threaded members may be used at either end of the housing to hold the filter members in place.
In several embodiments, the threaded members have convex, conical shaped ends which mate with concave conical shaped surfaces of seal members which act to center and seal the ends of the annular filter elements.
REFERENCES:
patent: 1941895 (1934-01-01), O Hennings
patent: 4052317 (1977-10-01), Palnik
patent: 4725323 (1988-02-01), Ostreicher et al.
patent: 4728421 (1988-03-01), Moddemeyer
patent: 5173186 (1992-12-01), Spafford et al.
patent: 5770066 (1998-06-01), Coates
Barry Chester T.
Zobal Arthur F
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