Improvements in Fire Grates.
Year: 1893

page_text: Date of Application, 8th Nov., 1893
Complete Specification Left, 8th Aug., 1894-Accepted, 15th Sept., 1894
PROVISIONAL SPECIFICATION,
Improvements in Fire Grates.
I, ROBERT CROSTHWAITE of 153 Queen Victoria Street, in the City of
London, Iron Merchant, do hereby declare the nature of this invention to be as
follows:-
. . :
This invention relates to fire grates and may be carried out as follows:-The
back and body of the grate may be made of metal, lined if desired with fire-clay
or the like, the front portion having suitable fire bars conveniently upright and the
whole being pivotted in or upon suitable standards with any necessary side plates
or the like. Above this grate and conveniently centrally above it is a suitable
fixed flue of such dimensions that when the back is brought forward by turning
the body upon its pivots the flue is more or less closed and more or less opened
when the grate is turned back. By this means the area of the flue opening can be
easily varied as may be required.
Any suitable means may be employed for securing the fire grate in the required
position such as a toothed segment and a pawl or the like to engage with it; a worm
segment and worm or other suitable device.
Other means besides pivots may be employed for hanging or supporting the
grate; for example rollers or the like would serve the same purpose.
Dated this 7th day of November 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Fire Grates.
I, ROBERT CROSTHWAITE of 153 Queen Victoria Street, in the City of
London, Iron Merchant, do hereby declare the nature of this invention anu in.
what manner the same is to be performed, to be particularly described and.
ascertained in and by the following statement :-
This invention relates to fire grates and may be carried out as follows:-The
back and body of the grate may be made of metal, lined if desired with fire-clay
bricks or the like, the front portion having suitable fire bars, conveniently upright,
and the whole being pivotted in or upon suitable standards with any necessary side.
plates or the like. Above this grate and conveniently centrally above it is a
suitable fixed flue of such dimensions that when the back is brought forward by
turning the body upon its pivots the flue is more or less closed and more or less
opened when the grate is turned back. By this means the area of the flue
opening can be easily varied as may be required.
Any suitable means may be employed for securing the fire grate in the required.
position such as a toothed segment and a pawl or the like to engage with it; a
worm segment and worm or other suitable device.
Other means besides pivots may be employed for hanging or supporting the
grate; for example rollers or the like would serve the same purpose.
In the accompanying drawings:-
Figure 1 is a perspective view partly in section showing one arrangement of the
ared crate and

page_text: Figure 2 is a sectional side elevation showing the grate with an inclined flue.
Like letters represent like parts in both figures.
A represents the grate proper or fire basket the sides and back of which may
be lined solid or in parts with fire clay or the like while the front is preferably
formed with open bars B. The grate A is movably carried in any suitable
standards or framework C preferably by pivotting as at A' so that the grate may
be turned upon the pivots and the neck or top portion A may be brought forward
or backwards as required. The upper portion or neck is closed in as shown at A³,
the top D being if desired formed as the arc of a circle struck from the centre A'
and the products of combustion passing up in front of the top D as indicated by
the arrows in Figure 1, where a portion of the fixed flue E is broken away to show
the arrangement. The top is shown provided at each side with a ledge or
projection F between which the back of the fixed flue E extends so that the
movement of the grate A is limited to the distance between the ledges F which
by preference would be about equal to the interior space from the front to the
back of the flue E. When therefore the grate is moved forward so that the back
edge E¹ of the flue E comes into contact with the back ledge F of the grate A
the flue would be practically closed by the top D which would be moved forward
underneath the flue E and thus close it up; on the other hand, when the grate
was in its backward position as shown in Figure 1 and the front ledge F engages
with the edge E¹ of the fixed flue E the said flue would be wide open-the position
of the grate A can be varied so as to give any amount of opening to the flue E
intermediate between these two extremes. By this means the rush of air from the
room which carries with it into the flue a considerable quantity of the heat which
would otherwise be radiated into the room can be easily controlled.
Various means may be employed for fixing the grate A in the required position
a convenient means being to pivot one end G₁ of a rack G to the side of the
grate A so that its teeth may engage with the projecting lug C¹ of the standard C
and thus hold the grate in the required position.
In Figure 2 the construction is the same as in Figure 1, but whereas in Figure 1
the grate is put well back into the wall space provided for it and the flue E is
vertical, in Figure 2 the flue E is inclined backwards to allow of the grate being
brought further into the room than is the case with Figure 1, a considerable space
being left between the back of the grate and the front of the wall opening. The
flue E may be curved or slanted in any desired manner.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Varying the size of the flue opening by moving the fire grate.
2. A pivotted or movable fire grate such as A the upper portion of which serves
for closing or opening the flue substantially as described.
3. A fire grate pivotted or movable for the purpose of varying the size of the
flue opening.
4. The combination with a pivotted or movable fire grate such as A of a closed
neck or top such as D substantially as and for the purpose described and illustrated
in the accompanying drawings.
5. The combination with a pivotted or movable fire grate, such as A of a fixed
flue such as E substantially as described and illustrated in the accompanying
drawings.
Dated this 7th day of August 1891
ROBERT CROSTHWAITE.
W. P. Thompson & Boult,
Agents for the Applicant.