# US 4,145,196 A · Filter element

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- Number: US 4,145,196 A
- Document ID: US4145196A
- Status: Granted
- Kind: A
- Application number: 05/835,754
- Filed: 1977-09-22
- Granted: 1979-03-20
- Earliest claimed: 1976-10-08
- Assignees: AB Lectrostatic
- Inventors: Magnus Alskog
- Web page: https://patentgrep.com/patent/US4145196A

## CPC

- A47L 9/14: Bags or the like; {Rigid filtering receptacles;} Attachment of, or closures for, bags {or receptacles}
- B01D 46/02: Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A filter element having a bag of filter medium surrounded by an elastic net hose with a corrugated wall interposed therebetween.

## Claims

### Claim 1

In a filter element intended to operate at high, pulsating pressure and including a hose-like filter means made of fibrous material, an inlet to the interior for supplying contaminated air and a wall through which purified air departs, the filter means surrounded by a net-like, elastic hose-like member, the improvement comprising; the length of the filter means and the circumference of said means in the expanded state of said means exceed the length and circumference of the net-like hose-like member, a corrugated wall interposed between said filter member and said hose-like member, the filter means arranged in folds abutting the corrugated wall, said corrugations extending in the longitudinal direction of the filter means, and said filter means held compressed by said hose-like member.

### Claim 2 (depends on 1)

A filter element according to claim 1, wherein the filter means has a bottom remote from said inlet; and the pressure-absorbing hose-like member has a bottom abutting said bottom of said filter means.

### Claim 3 (depends on 1)

A filter element as claimed in claim 1, wherein the inner surface of the net-like, hose-like member abuts said corrugated wall.