# US 5,347,983 A · Draft hood attachment device

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- Number: US 5,347,983 A
- Document ID: US5347983A
- Status: Granted
- Kind: A
- Application number: 08/036,956
- Filed: 1993-03-25
- Granted: 1994-09-20
- Earliest claimed: 1993-03-25
- Inventors: Ronald J. Shimek
- Web page: https://patentgrep.com/patent/US5347983A

## CPC

- F24B 1/1808: {Simulated fireplaces}
- F24B: DOMESTIC STOVES OR RANGES FOR SOLID FUELS (for solid fuels in combination with gaseous fuels, liquid fuels or other kinds of energy supply F24C1/02); IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES

## Abstract

A novel draft hood for mounting on top of a gas conversion unit to form an adaptor and coupler between the gas conversion unit and a chimney includes a box structure having a guide flange and a plurality of positioning flanges thereon. A down draft diverter is installed inside of the box structure juxtaposed the exhaust outlet in the top of the draft hood. A novel spring alignment means including control rod are inserted through the top of the draft hood and employed as a positioning and aligning device maneuverable from the inside of the combustion chamber of the gas conversion unit and employed to apply a spring force to the draft hood which couples it to the gas conversion unit.

## Claims

### Claim 1

A draft hood device for mounting on top of a gas conversion unit in a fireplace enclosure, comprising:
a box having an exhaust inlet in the bottom and an exhaust outlet adaptor in the top,
positioning means on the sides of said box for aligning and positioning said box on the top of said gas conversion unit,
down draft diverter means mounted inside of said box in between said exhaust inlet and exhaust outlet, and
means for connecting and aligning said draft hood device to the top of said gas conversion unit which includes spring means for applying a coupling force between said box and the top of said gas conversion unit.

### Claim 2 (depends on 1)

A draft hood device as set forth in claim 1 wherein said connecting means comprises a compression spring mounted on top of said box and a connecting rod mounted through said box and through said compression spring for applying a coupling force thereto.

### Claim 3 (depends on 1)

A draft hood device as set forth in claim 1 which further includes exhaust gas baffle means mounted inside of said box for diverting exhaust gases in a horizontal direction before they enter into the exhaust outlet adaptor.

### Claim 4 (depends on 3)

A draft hood device as set forth in claim 3 wherein said exhaust gas baffle means comprises an L-shaped structure.

### Claim 5 (depends on 4)

A draft hood device as set forth in claim 4 wherein said L-shaped structure comprises a pair of L-shaped sheet members.

### Claim 6 (depends on 1)

A draft hood device as set forth in claim 1 wherein said connecting means comprises a tension spring mounted on the inside of said box.

### Claim 7

A method of installing a gas conversion unit in a fireplace enclosure, comprising the steps of:
connecting a flue liner to an exhaust outlet adapter of a draft hood,
supporting said draft hood to clear the top of said gas conversion unit,
inserting said gas conversion unit in the fireplace enclosure,
reaching through the top of the gas conversion unit from the inside and moving said draft hood unit to an aligned position on top of said gas conversion unit, and
applying a spring force on said draft hood to tightly mount and couple said draft hood to the top of said gas conversion unit.

### Claim 8 (depends on 7)

A method as set forth in claim 7 wherein the step of applying a spring force on said draft hood comprises the step of compressing a compression spring on the top of said draft hood with a T-bar rod.

### Claim 9 (depends on 7)

A method as set forth in claim 7 wherein the step of applying a spring force on said draft hood comprises the step of tensioning a tension spring on inside of said draft hood.