IMPROVEMENT IN FURNACE FIRE DOOR LINERS
Year: 1884

page_text: THOMAS DUGARD 84 Greenwood Rond Dalston London E. Clerk do hereby
declare the nature of my Invention for IMPROVEMENT IN FURNACE FIRE DOOR
LINERS to be as follows:-
The furnace fire door liner is made of cast iron with air tubes cast inside the
liner and extending two inches or more into the furnace next the fire. The fire
door liner will have fifty two tubes 3 inches long and they will have of an inch
openings or inlets and will stand apart inside next the fire, and will mesh or not
next the furnace door. The netting of the air tubes gives great endurance to the
liner. The tubes next the fire form a shield that absorbs the heat, protects the
door liner and delivers the air very hot and in suitable condition for perfect
combustion-the combustion of highly heated air got in at the front of the fire
secures great increase of intense heat and great economy in fuel.
Dand his the door of Tina 1001

page_text: THOMAS DUGARD of 84 Greenwood Road Dalston Middlesex Clerk, do hereby
declare the nature of my Invention for IMPROVEMENTS IN FURNACE FIRE
DOOR LINERS, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:—
My improvements in fire-door liners are clearly represented in the detailed views i
of Fig. I. II. and III. of the Drawings accompanying this Specification which are
respectively, perspective and cross-sectional views of the fire-door liner, and
consists in the peculiar construction and arrangement of the parts as hereinafter
more fully set forth and pointed out in the claims.
I form the fire-door liner of a lining Fig. I. a' which is made of cast-iron, with
air tubes Fig. I. 62, cast in the lining and extending an inch or more into the
furnace next the fire.
The fire-door liner will have 52 or any less number of air tubes Fig. I. b three
inches or less in length and will have five-eighths of an inch openings or inlets
Fig. I. c² and will stand apart next the fire and will mesh or net next the furnace 1
door as shewn in Fig. II. .
The netting of the air tubes gives the door liner great endurance.
The air tubes Fig. I. 6 form a shield that absorbs the heat and protects the
liner from the direct heat of the fire and delivers the air very hot and in suitable
condition for perfect combustion.
The combustion of the large amount of highly heated air got in at the proper
place, the front of the fire secures increased intense heat in the furnace and very
great economy in fuel.
The openings Fig. I. e² are for bolts to fix fire-door liner to furnace door.
2
The elevation above plane of tubes shewn in Fig. 11. f is a phlange forming an 2
air chamber between plane of tubes and furnace door.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
1. The fire-door liner is composed of a lining Fig. I. a² having air tubes Fig. I. b² 3
cast in lining.
2. The combination in fire-door liner of lining Fig. I. a³ and tubes Fig. I. b³,
meshed or netted Fig. II. d² on side next the furnace door and standing apart
Fig. I. on side next the fire as shewn and described.
3. The combination in fire-door liner of lining Fig. I.a with air tubes Fig. I. ³ 3
moshed or netted Fig. II. d on side next furnace door and standing apart Fig. I. on
side next the fire, and phlange Fig. II. f forming air chamber between plane of
tubes and furnace door, as shewn and described.
Dated this Second day of September 1884.