IMPROVEMENTS IN DOMESTIC FIRE GRATES
Year: 1884

page_text: I, THOMAS FRASER, of 46 King Street, Aberdeen, in the county of Aberdeen,
Agent, do hereby declare the nature of my said invention for "IMPROVEMENTS IN
DOMESTIC FIRE GRATES," to be as follows:-
This Invention has for its object to effect the more complete combustion of the
fuel used in domestic fire grates, while permitting of the use of dross, slack, or
small coal and reducing the production of smoke.
This object I attain by fitting in the back of any ordinary domestic fire grate, a
curved plate of metal or other material in the form of an arch rising from the level
of the lower grating at the back and reaching forward at its upper end partly over
the fire to the framework of the grate in which the brick back is usually fitted.
Side plates are also formed on this curved back plute, and it may be fitted loosely
so that it is movable in the grate body. In the upper part of the arched plate
I form inlets for the admission of air to the fuel which is placed in the fire grate
and fills up the space under and in front of the arched plate.. The fire burns in the
front of the fire grate where alone a sufficiency of air to produce combustion 'is
admitted, and the fuel next to the arched plate and under the arch becomes coked,
the gases generated passing through the fire being consumed. When the fire in
front burns low, the coked fuel under the arch. is raked forward and the smoke
from the heated coal is soon consumed, while a fresh supply of dross is fed into the
space under the arched plate.

page_text: I THOMAS FRASER of 46 King Street Aberdeen in the county of Aberdeen
Agent do hereby declare the nature of my invention for, "IMPROVEMENTS IN
DOMESTIC FIRE-GRATES and in what manner the same is to be performed to
be particularly described and ascertained in and by the following statement:-
"
This invention has for its object to effect the more complete combustion of the
fuel used in domestic fire grates while permitting of the use of dross, slack or small
coal and reducing the production of smoke.
This object I attain by fitting at the back of any ordinary domestic fire, grate as
illustrated in elevation and vertical section in figures 1 and 2 of the accompanying
drawings a curved plate A of metal or other material in the form of an arch rising
from a plate B at the level of the lower grating C at the back and reaching forward
at its upper end partly over the fire to the framework D of the grate in which the
brick back is usually fitted. Side plates are also formed on this curved back plate
and it may be fitted loosely or be secured by bolts and nuts or similar devices so
that it is movable in the grate body. In the upper part of the arched plate A I may
form inlets for the admission of air to the fuel which is placed in the fire grate and
fills up the space under and in front of the arched plate. The fire burns in the
front of the fire grato C where alone a sufficiency of air to produce combustion is
admitted and the fuel next to the arched plate and under the arch A becomes coked
the gases generated passing through the fire and being consumed. When the fire
in front burns low the coked fuel under the arch A is raked forward and smoke
from the heated coal is soon consumed while a fresh supply of dross is fed into the
space under the arched plato. In other respects the grate is of the ordinary
construction.
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
The arrangement in combination with an ordinary fire-grate of an arched
chamber at the back thereof substantially as and for the purpose set forth.
Dated this 12th day of August 1885