# US 5,350,012 A · Rotary fin machine

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- Number: US 5,350,012 A
- Document ID: US5350012A
- Status: Granted
- Kind: A
- Application number: 07/934,011
- Filed: 1992-08-21
- Granted: 1994-09-27
- Earliest claimed: 1992-08-21
- Assignees: Voss Manufacturing, Inc.
- Inventors: Kazimierz Sadowski; Donald Ziemendorf; Robert Carlo; Gary Kochems
- Web page: https://patentgrep.com/patent/US5350012A

## CPC

- F28F 1/10: Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses (crimped or corrugated elements F28F1/06, F28F1/08)
- B21D 13/04: by rolling
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)

## Abstract

A serpentine louvered heat exchange element comprising a folded metallic strip having a length and width wherein the length is over ten times the width prior to being folded. The strip has back and forth folds with legs having substantially equal lengths defined therebetween. A plurality of the legs are provided with louvres having openings which allow the passage of fluid. Each of the folds have a fold apex with an observable preformed fold arc.

## Claims

### Claim 1

A serpentine louvered heat exchange element comprising a folded metallic strip having a length and width wherein the length is over ten times the width prior to being folded, said strip having back and forth folds with legs having substantially equal lengths defined therebetween, a plurality of said legs being provided with louvres having openings which allow the passage of fluid, each of said folds having a fold apex with an observable preformed fold arc characterized by an observable fold line at a junction of the preformed fold arc with the remainder of the fold.

### Claim 2 (depends on 1)

The element of claim 1 wherein the fold arc is essentially a circular arc and the radius of the arc is no greater than sixty times the thickness of the metallic strip.

### Claim 3 (depends on 1)

The element of claim 1 wherein the fold arc may be bisected to form essentially identical arc halves.

### Claim 4 (depends on 3)

The element of claim 3 wherein the thickness of the metallic strip is from 0.001 to 0.003 inch.

### Claim 5 (depends on 3)

The element of claim 3 wherein radius of the fold apex arc is from 0.005 inch to 0.05 inch.

### Claim 6 (depends on 3)

The element of claim 3 wherein the element has from 10 to 30 folds per inch of finished folded fin.