and in Appliances for Operating the same.
Year: 1885

page_text: and in Appliances for Operating the same.
I THOMAS JOHN CONSTANTINE of 61 Fleet Street, London, Manufacturer of
The Treasure Cooking Range do hereby declare the nature of my said invention
for "IMPROVEMENTS IN MOVABLE BOTTOM GRATES OF RANGES AND STOVES AND
IN APPLIANCES FOR OPERATING THE SAME" to be as follows:-
The object of my invention is to so construct or arrange movable bottom grates
of ranges and stoves and appliances connected therewith that said bottom grates
may be lifted from the front with a simultaneous lifting and retiring action of
the rear towards the upper back of the stove in an almost level manner the front
bars being so shaped as to allow of this rise to diminish the fuel area with a
corresponding reversed decending motion to increase the area for the full charge
of fuel.
For the purpose of my invention I make a loose fitting bottom grate with lugs
or projections on its front underside and with bearing ribs on the back underside
these being shaped to sit and ride upon a segmental or curved back of the fire
basket on which stops are arranged to prevent the bottom grate rising beyond a
certain limit.
The lugs on the front underside are socketed to a lever whose fulcrum is at the
rear of the ashpit or near thereto, said fulcrum being formed by lugs on the sides
or in other convenient position of the ashpit. The lever has an arm projecting
this being connected to a rod provided with notches and working within a catch
to hold the rod at any desired position to determine the height at which the
bottom grate shall be raised and be held.
The notches of the rod are made ratchet shape so that it moves freely in one
direction such as when lifting the bottom grate by pulling it; i.e. the rod, outwards
which movement would also be effected if the bottom grate be lifted without
touching the rod.
By this invention the bottom grate is set much lower at the front when at the
bottom of the fire basket than at the back and simultaneously with the lifting

page_text: action from the front it has a sliding lifting action at less speed at the rear on the
curved back of the fire basket consequently it has neither a direct vertical lift as
with some forms of movable bottom grates nor has it a pivotted action from the
rear as in other forms of movable bottoms.
I purpose in conjunction with the above invention to corrugate or channel the
side walls of the fire basket the grooves being made to correspond to the movement
of the bottom grate so that the fuel is not broken up by the lifting action but is
caused to move in the same radii as the bottom grate, the channels or grooves
serve for the passage of air into and through the fire basket to not only assist in
supporting combustion but to protect the sides of the fire basket from the usual
destruction by intense heat.

page_text: and in Appliances for Operating the same.
I THOMAS JOHN CONSTANTINE of 61 Fleet Street, London, Manufacturer of
the Treasure Cooking Range do hereby declare the nature of my said invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
The object of my invention is to so construct or arrange movable bottom grates
of ranges and stoves that said bottom grates may be lifted by lever or other
appliance from the front with a simultaneous lifting and retiring action of the
rear towards the upper back of the stove in an almost level manner the front bars
being so shaped as to allow of this rise to diminish the fuel area or to increase the
fuel area by a corresponding reversed descending motion.
My invention will be understood by the annexed drawings in which at
Figures 1 and 3 (a perspective view) I show the bottom grate in its lowest
position, the dotted lines in Figure 1 showing the bottom grate lifted half way up
the fire basket, and at Figure 2 the bottom plate lifted to its greatest extent.
My bottom grate A is fitted loosely with lugs or projections B on its front
underside and with bearing ribs C on the back underside these being shaped to
set and ride upon a segmental or curved back D of the fire basket on which stops E
may be arranged to prevent the bottom grate A rising beyond a certain limit.
The lugs B on the front underside are socketed to a lever F whose fulcrum G is
at the rear lower part or in the ashpit said fulcrum G being formed by lugs H on
the side cheeks I or in other convenient position of the ashpit. The lever F has
an arm J projecting, this being connected to a rod K provided with notches Land
working within a catch M to hold the rod at any desired position to determine the
height at which the bottom grate shall be raised and be held.
The notches L of the rod K are made ratchet shape so that the rod K moves
freely in one direction such as when lifting the bottom grate A by pulling the rod
outwards by a pull on the ring or other shaped end N.
Instead of pulling the rod K the bottom grate A can be lifted by its lip P from
the front or from between the bars Q to the position shown in dotted lines
Figure 1 or to the highest position as shown at Figure 2 the rod K yielding to the
motion.
By this invention the bottom grate sits much lower at the front when at the
bottom of the fire basket than at the back and simultaneously with the lifting
action from the front it has a sliding lifting action at less speed at the rear on the
curved back of the fire basket consequently it has neither a direct vertical lift as
with some forms of movable bottom grates nor has it a pivotted action from the
rear as in other forms of movable bottoms.
I purpose in conjunction with the above invention to corrugate or channel the
side walls I, I, of the fire basket the channels or grooves corresponding in shape to
the motion of the bottom grate so that the fuel is not broken up by the lifting
action but is caused to move in the same radii as the bottom grate. The channels
or grooves also serve for the passage of air into and through the fire basket to not

page_text: only assist in supporting combustion but to protect the sides of the fire basket
from the intense heat which is so destructive particularly if made of iron.
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 improved method of fitting and moving bottom grates of ranges and
stoves as herein described and as shown by the annexed drawings for the purpose
set forth.
2. Fitting in a range or stove a loose bottom grate capable of a movement
upwards and rearwards at the back and upwards only in a curvilinear manner at
the front until both back and front are in line or nearly so, said motions being
effected simultaneously by appliances fitted under said loose bottom grate as herein
described.