Filter assembly including an integral filter cartridge and...

Liquid purification or separation – With repair or assembling means – Removable treatment part with normally disabled flow controller

Reexamination Certificate

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Details

C210S238000, C210S248000, C210S447000, C210S454000, C210S470000, C210S484000, C055S357000

Reexamination Certificate

active

06248237

ABSTRACT:

The invention concerns a process for changing a filter cartridge mounted in a liquid drainage conduit that is removable from the conduit through an opening in the wall of the latter, and the design of the filter cartridge to be used in such process.
The disadvantages of known processes and designs of this type include the fact that the replacement process is so time-consuming that either a temporary auxiliary filter must be installed or air circulation must be stopped, which results in pollution of the environment by the materials trapped in the air filter.
The goal of the invention is to provide a process and a filter cartridge design that remedies such disadvantages.
To achieve that goal, the process according to the invention is characterized in that the cartridge is engaged, as it is removed from the conduit, in a closed pouch that is open only at the said [conduit wall] opening.
The design of the filter cartridge used in this process is characterized in that it includes a hood capable of being attached to the rim of the opening for inserting and removing the filter cartridge, and comprising two removable mountable parts, a first upper hollow main part that is joined to the filter cartridge and houses a pouch that is folded up and joined to the bottom of said hood part, and a second hood part to which the other open end of the pouch is attached and which is mounted to and removable from the rim of the opening, the length of the pouch being at least slightly bigger than the size of the cartridge in the direction of the cartridge removal motion.
According to one characteristic of the invention, the design includes a shutter device to open and close the conduit after removal of the cartridge.
According to yet another characteristic of the invention, the part of the cartridge that is opposite the part that is joined to the hood includes means to close the pouch after the cartridge is engaged in it.


REFERENCES:
patent: 3354616 (1967-11-01), Lucas
patent: 4057406 (1977-11-01), Jansson
patent: 4882051 (1989-11-01), Itoh
patent: 5837040 (1998-11-01), Caughron et al.

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