# US 2012/0288809 A1 · Hot air generator device with improved lighting

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- Number: US 2012/0288809 A1
- Document ID: US20120288809A1
- Status: Published application
- Kind: A1
- Application number: 13/425,997
- Filed: 2012-03-21
- Published: 2012-11-15
- Earliest claimed: 2011-05-13
- Assignees: Sefmat
- Inventors: Francois CLEMENT
- Web page: https://patentgrep.com/patent/US20120288809A1

## CPC

- F23D 14/38: Torches, e.g. for brazing or heating (nozzles F23D14/48)
- F23D 14/465: {for torches (F23D14/52 takes precedence)}
- F23D 14/64: with injectors
- F23Q 3/002: {using piezoelectric elements}
- F23D: BURNERS
- F23Q: IGNITION (devices or installations peculiar to internal-combustion engines F02P; of cigarettes or tobacco A24F; compositions therefor, chemical igniters C06C); EXTINGUISHING-DEVICES

## Abstract

A hot air generating device of the type including an injection device (2) capable of producing a flow of a combustible gas mixture at a high speed and a burner head (3) in which the flow is ignited via a spark plug (6) positioned near the burner (3) and electrically connected to a lighter (12), preferably a piezoelectric lighter, including an autotransformer mounted in parallel between the lighter and the spark plug. Such a device is particularly advantageous to facilitate the lighting of the mixture, in particular when the device is provided with a riser between the lighter and the spark plug.

## Claims

### Claim 1

A hot air generating device of the type comprising an injection device (2) capable of producing a flow of a combustible gas mixture at a high speed and a burner head (3) in which the flow is ignited via a spark plug (6) positioned near said burner (3) and electrically connected to a lighter (7), preferably a piezoelectric lighter,
characterized in that it also comprises means (9) to reduce the capacitive losses between the lighter and the spark plug.

### Claim 2 (depends on 1)

The device according to claim 1, characterized in that it comprises a riser tube between the injection device (2) and the burner (3).

### Claim 3 (depends on 1)

The device according to claim 1, characterized in that the means (9) for reducing losses comprise means to make the increase in the voltage (T6) at the terminals of the spark plug (6) more gradual.

### Claim 4 (depends on 3)

The device according to claim 3, characterized in that the means (9) for reducing losses comprise a transformer (9), of the autotransformer type, mounted in parallel with the lighter (7).

### Claim 5 (depends on 4)

The device according to claim 4, characterized in that the transformer (9) is mounted as a step-down transformer.

### Claim 6 (depends on 4)

The device according to claim 4, characterized in that the transformer (9) is mounted near the lighter (7).

### Claim 7 (depends on 2)

The device according to claim 2, characterized in that the means (9) for reducing losses comprise means to make the increase in the voltage (T6) at the terminals of the spark plug (6) more gradual.

### Claim 8 (depends on 7)

The device according to claim 7, characterized in that the means (9) for reducing losses comprise a transformer (9), of the autotransformer type, mounted in parallel with the lighter (7).

### Claim 9 (depends on 8)

The device according to claim 8, characterized in that the transformer (9) is mounted as a step-down transformer.

### Claim 10 (depends on 5)

The device according to claim 5, characterized in that the transformer (9) is mounted near the lighter (7).

### Claim 11 (depends on 10)

The device according to claim 10, characterized in that the transformer (9) is mounted near the lighter (7).