US 5,685,985 AGranted

Environmentally friendly filter cartridge

AssigneeBaldwin Filters, Inc.

InventorsGene W. Brown, Jeffrey E. D. Rogers

Life of this patent

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Abstract

A filter cartridge for use in a filter system, in which the cartridge has no structural metal or plastic parts and is adapted for environmentally acceptable disposal. A pleated paper filter media is formed into a cylinder, and potted end caps at the axial ends of the cylinder hold the shape of the filter. Sealing gaskets are associated with the end caps. At least one side has a radial seal formed at the outer periphery of the filter cartridge to protect the associated end cap from higher a pressure region found at the outer periphery. The other axial end can have a similar radial filter in some applications, or in other applications, where flow at that end of the filter is not desired, can utilize an axial seal specially configured to protect the associated end cap from higher pressure at the outer periphery. Maintenance of lower pressure at the respective end caps places any axial loads on the filter in tension, and thereby prevents the application of axial crushing loads on the filter cartridge.

Claims32

Dependent claims

A disposable filter cartridge having no structural metal parts and comprising in combination:

a pleated paper filter media formed into a cylinder in which the pleats define a cylindrical internal bore within the filter media and a cylindrical outer periphery,
end caps of potting material connected to the pleats at respective axial ends of the filter media,
the filter cartridge having an intended flow path from a higher pressure region at its outer periphery to a lower pressure region at its internal bore,
a first one of the end caps having integrally formed therewith an elastomeric radial seal positioned at the outer periphery to protect the associated end cap from the higher pressure region at the outer periphery of the filter cartridge,
the other end cap having seal means for preventing the higher pressure in the region at the outer periphery of the filter cartridge from being applied to the outside end of said other end cap,
the end caps and pleats being adapted to accept a structural supporting tube in a filter housing to assist the pleated paper in withstanding pressure applied in a radial direction from the outer periphery to the internal bore,
the seals associated with the respective end caps being configured to communicate the lower pressure in the region at the internal bore to the end caps to avoid the application of crushing axial loads to the filter cartridge.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/575,833Filed 20 Dec 1995
Granted: 11 Nov 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B01D 29/21
Arranged for inward flow filtration: with corrugated, folded or wound sheets
B01D 29/58
In series connection: arranged concentrically or coaxially
B01D 29/96
Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00;…: in…
B01D 35/30
Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by…