Year: 1887

page_text: Date of Application, 24th Jan., 1887
Complete Left, 24th Oct., 1887
Complete Accepted, 25th Nov., 1887
JOHN BAKER COLBRAN 247 High Holborn in the County of
do hereby declare the nature of this invention to be as follows:
Middlesex Dalesmun
My invention which relates to fire places particularly that of the cooking apparatus
consists of an improved arrangement for raising or lowering the bottom fire grate so
as to diminish or enlarge the fire space at pleasure.
To carry the said invention into practice I construct an angular grating which
forms part of the front fire bars and bottom grate which may be made in one piece, or
two pieces jointed at the angle as the case may require.
At the front & top sides of the angular grating which forms part of the front fire
bars are provided pivots upon which the angular grating is made to rotate in supports
or bearings provided in breast or fire frame. On the sides of the angular grating
immediately under the aforesaid pivots are provided two small curved ratchets having
A stud is
the pivots for their centres with the teeth of ratchets downwards.
provided on the inside of fire frame immediately under each ratchet on which the
teeth of the latter slide when the angular grating is made to rotate upwards. The
teeth of ratchets also lodge against these studs when the grating is a rest. By means
of these ratchets & studs the angular grating can with the aid of tongs or any suitable
implement be held at any desired elevation.
To lower the grating the ratchets are lifted off the studs when it falls of its own
weight. When the angular grating is at its lowest possition it affords a large fire
space but when raised to its highest possition the fire space is greatly reduced.
Instead of using the studs in connection with the ratchets before mentioned I can if
desireable use a pivotted catch to detain the angular grating at any desired height or
can adopt any other suitable form of catch.

page_text: JOHN BAKER COLBRAN 247 High Holborn in the County of Middlesex Salesman
do hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
My said invention which relates to the fire space, box or compartment for fuel in
cooking, warming & other stoves consists of an improved arrangement for raising or
lowering the bottom fire grating so as to diminish or enlarge the fire space at
pleasure.
For this purpose I construct substantially according to the arrangements indicated
by the accompanying drawing.
The drawing represents a section of a Cooking Range through the fire box.
A is the angular or curved bottom grating which when in its lowest position forms
part of the front and the bottom of the fire box. It can be made in one piece or
more as the exigencies of the particular case may require.
The dotted lines show the position of the grating when raised.
At the front & top sides of the angular grating are provided pivots B, upon which
the angular grating is made to rotate in supports or bearings C, which are fixed on
breast or front of Range.
On the sides of the angular grating under the aforesaid pivots C, are provided two
small curved ratchets D, having the pivots C. for their centres with the teeth of the
ratchets downwards. A stud E. is provided on the inside of the fire frame Fon
which the teeth of the ratchet slide when the angular grating is made to rotate
upwards. The teeth of the ratchets also lodge against these studs when the grating
is at rest.
By means of these ratchets & studs the grating can with the aid of tongs or any
suitable implement be held at any desireable elevation. In the place of these studs E,
a pawl or moveable catch can be moved pivotted on fire frame & made to catch in
teeth of ratchet.
To lower the angular grating the ratchets are lifted off the studs when the grating
will fall of its own weight or be eased down with the implement used for raising same.
Where a back boiler is used a plate & the same width as the grating is cast on or
attached to the under side of angular grating this plate excludes the cold air from
entering the boiler flue when angular grating is raised.
Any suitable means can be provided and used for the lowering or raising the
grating.
Having now particularly described & 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
1st. A moveable bottom of an angular or curved shape pivotted at its front top
edge.
2nd. The plate on the underside of such angular or curved grating to exclude the
cold air from the flue of back boiler when the aforesaid grating is raised.
13
JOHN BAKER COLBRAN.