# US 5,341,565 A · Method of securing a filter element to a blade of a fan

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- Number: US 5,341,565 A
- Document ID: US5341565A
- Status: Granted
- Kind: A
- Application number: 08/076,748
- Filed: 1993-06-15
- Granted: 1994-08-30
- Earliest claimed: 1993-06-15
- Inventors: William Kuryliw
- Web page: https://patentgrep.com/patent/US5341565A

## CPC

- F24F 13/28: Arrangement or mounting of filters
- F04D 29/388: {characterised by construction}
- F04D 29/703: {specially for fans, e.g. fan guards}
- Y10T 29/49339: Hollow blade
- Y10T 29/49341: with cooling passage
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of securing a filter element to a blade of a fan includes firstly, forming a cavity within a fan blade so that the cavity has a tip end oriented toward a tip of the fan blade and a root end oriented toward a root of the fan blade. Secondly, form at least one flow passage extending from one broad surface of a fan blade through the cavity to an opposed broad surface of the fan blade, such that air circulates through the cavity via the flow passages upon movement of the fan blade. Thirdly, form an access opening through which a filter element is inserted into the cavity.

## Claims

### Claim 1

A method of securing a filter element to a blade of a fan, comprising the steps of:
a) firstly, forming a cavity within a fan blade, the cavity having a tip end oriented toward a tip of the fan blade and a root end oriented toward a root of the fan blade;
b) secondly, forming at least one flow passage extending from one broad surface of the fan blade through the cavity to an opposed broad surface of the fan blade, such that air circulates through the cavity via the at least one flow passage upon movement of the fan blade; and
c) thirdly, forming an access opening into the cavity;
d) fourthly, inserting a filter element through the access opening into the cavity.

### Claim 2 (depends on 1)

The method as defined in claim 1, means being provided to prevent the filter element from being propelled back through the access opening by centrifugal force.

### Claim 3 (depends on 1)

The method as defined in claim 1, the access opening being a channel extending at an angle through one of the broad surfaces of the fan blade adjacent one of the tip end and the root end.

### Claim 4 (depends on 2)

The method as defined in claim 2, the access channel being at an angle of between 5 degrees and 35 degrees.

### Claim 5 (depends on 2)

The method as defined in claim 2, the access channel being adjacent to and spaced inwardly from the tip end while being angled toward the root end, such that upon rotation of the fan blade the filter element is propelled by centrifugal force past the access channel until the filter element engages the tip end thereby maintaining the filter element within the cavity.

### Claim 6

A method of securing a filter element to a blade of a fan, comprising the steps of:
a) forming a cavity within a fan blade, the cavity having a tip end oriented toward a tip of the fan blade and a root end oriented toward a root of the fan blade;
b) forming flow passages extending from one broad surface of the fan blade through the cavity to an opposed broad surface of the fan blade, such that air circulates through the cavity via the flow passages upon movement of the fan blade;
c) forming an access channel through one of the broad surfaces of the fan blade adjacent to and spaced inwardly from the tip end while being angled between 5 and 35 degrees toward the root end; and
d) inserting a filter element through the access opening into the cavity, such that upon rotation of the fan blade the filter element is propelled by centrifugal force past the access channel until the filter element engages the tip end thereby maintaining the filter element within the cavity.