Improvements relating to Gas-heated Hot-plates for Cooking Purposes.
Year: 1888

page_text: Date of Application, 11th Oct., 1888
Complete Specification Left, 11th July, 1889--Accepted, 17th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements relating to Gas-heated Hot-plates for Cooking
Purposes.
1, MICHAEL MARY BROPHY, of the firm of James Slater & Co., 251, High
Holborn, in the County of Middlesex, Engineers, do hereby declare the nature of this
invention to be as follows:-
My invention relates to gas-heated hot-plates for cooking purposes the object being
to provide improved means for preventing waste of gas by automatically lowering
it immediately upon the removal of the cooking utensils from above the burners
and raising it when the utensils are placed on the hot-plate over the burners.
For this purpose, I arrange in connection with each burner a spring sliding rod
having a conical head which projects slightly beyond the surface of the bars of the
hot-plate.
When a cooking utensil is placed on the bars or pushed over the burner the
sliding rod is pressed downwards by the weight of the same and is raised (when the
utensil is removed from the bars, or from over the burner) through the medium of
its spring or of a weighted lever.
The sliding rod is connected by suitable means with the stem of a valve arranged
in connection with the air chamber the valve proper of which valve is a kind of
piston working in conjunction with a flat seat.
This piston is so arranged that when the sliding rod is lowered it is drawn away
from its seat and allows a free passage of gas to the burner. When the rod is raised
the piston or valve bears upon its seat and at this time a small quantity of gas passes
through a suitable bye pass or channel formed in the piston whereby the gas is
prevented from being completely extinguished when the valve proper is closed.
Dated the 11th day of October 1888
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Gas-heated Hot-plates for Cooking
Purposes.
1, MICHAEL MARY BROPHY, of the firm of James Slater & Co., 251, High Holborn,
in the county of Middlesex Engineers, 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 invention relates to gas-heated hot-plates for cooking purposes, the object
being to provide improved means for preventing waste of gas, by automatically
lowering it immediately upon the removal of the cooking utensils from above the
burners and raising it when the utensils are placed on the hot-plate over the
burners.
For this purpose I arrange in connection with each burner a spring sliding rod
having a conical head, which projects slightly above the surface of the hot-plate,
which rod, when a cooking utensil is placed over the burner is pressed downwards,
the motion of the said rod being utilized for operating a special valve for controlling
the supply of gas to the burner, as hereinafter described.
In the accompanying drawing-
Figure 1 represents a portion of a hot-plate and burner having my improvements
annlied thereto and

page_text: Figure 2 is a view of the same in a position at right angles to that shewn in
figure 1.
a indicates the upper frame of the hot-plate and bars supported therein; c is
a Bunsen-burner having the air-chamber d, and e is a bar upon which the said burner
is supported.
is a vertically sliding rod having a conical head g, which projects above the
hars bb, the said rod being carried in the arms or brackets h, i, formed integral with
the supporting bar e. The said conical head allows cooking utensils to be pushed over
the burner without damaging the rod.
jis a spring arranged between the bracket i and a collar k on the rod f, and serving
to normally. maintain the rod in its uppermost position.
7 is a gas-valve arranged in connection with the air-chamber d; the valve proper
of which is a piston m adapted to bear against a flat seat n, to shut off the supply of
gas from the burner.. o is a by-pass or channel formed in the piston for allowing a
small quantity of gas to pass to the burner, to prevent the flame from being completely
extinguished when the valve is closed. The stem p of the valve is connected by a
rod to a lever r on a shafts, the said shaft also carrying a lever t, the free end of
which is located in a slot formed in the lower end of the rod f.
With this arrangement it is obvious that when a cooking utensil is placed or
pushed over the burner, the sliding rod will be pressed downwards, so that the
piston m will be moved to allow a full supply of gas to pass to the burner, and that
when such utensil is removed the spring will raise the said rod and press the piston
against its seat, whereby the supply of gas will be cut off.
I wish it understood that I do not confine my invention to the details of construc-
tion hereinbefore described, as it is obvious that the same may be varied, for instance,
any suitable valve, and any desirable mechanism for communicating the motion of
the rod to the valve may be used, and a weighted-lever may be employed in lieu of
the spring.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
(1) In a gas-beated hot-plate, a sliding rod, the head of which normally projects.
above the surface of the said plate and which is adapted to be depressed by the
weight of a cooking utensil thereon; the movement of the said rod being utilized for
operating an independent gas-valve arranged in conjunction with the air-chamber, for
controlling the supply of gas to the burner, substantially as described.
(2) In a gas-heated hot-plate, provided with, means, substantially as horein before
described, for controlling the supply of gas to the burner, forming a conical head on
the top of the sliding rod, so that a vessel may be pushed over the burner, as set
forth.
(3) In a gas-heated hot-plate, the combination with the air-chamber of the Bunsen-
burner, of a gas-valve constructed substantially as hereinbefore described and illus-
trated in the accompanying drawing.
(4) The improvements relating to gas-heated hot-plates hereinbefore described and
illustrated in the accompanying drawings, for the purpose specified.
Dated the 11th day of July 1889
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.