Improvements relating to Gas Cooking Appliances.
Year: 1891

page_text: Date of Application, 15th Jan., 1891
Complete Specification Left, 15th Oct., 1891-Accepted, 15th Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements relating to Gas Cooking Appliances.
We, HARRY DARWIN, Managing Director, and JOHN GUTHRIE both partners
of the firm of H. Darwin & Co., Limited 618 Eglinton Street, Glasgow, North
Britain, Gas Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to gas cooking appliances and has for its objects ;
1st. To increase the utility of a gas grill;
2nd. To reduce the consumption of gas therein;
3rd. To simplify the conversion of a deflecting gas grill into a boiling appliance;
4th. To prevent the accidental fouling of burners in gas cooking appliances;
5th. To adapt the ribs or bars of a gas hob for being quickly and thoroughly
heated;
6th. To increase the heat arresting and refracting power of our grill deflecting
plates;
And we effect the said objects by means of the following mechanism :-
In carrying out our invention in connection with a gas cooking stove, we make
the grilling mechanism of our gas cooker, (when the said grill consists of three
parallel tube burners, placed horizontally between deflecting panels) with a lever
movement for oscillating the two outer tube burners thereof and enabling their lighted
jets to be turned beneath the deflecting panels for grilling, or above them for
boiling purposes, alternately as required, and when the said outside burners are
turned up from their grilling positions to those required for boiling, the supply of
gas is simultaneously cut off from the middle burner by means of the said lever
movement: also, when the two said, outside, burners are revolved into their
grilling positions the supply of gas is, by means of the same lever movement,
restored to the middle burner.
Either of the said transitions, together with the gas control, as named, is effected
with one backward or forward travel of the said lever movement.
We protect each jet piercing of our gas boiling rings and oven burners with a
small canopy or awning to prevent them being fouled and choked with grease or
other deposits during the process of cooking, and we make the bars or ribs which
form the grated cover of our gas hob or "hot hearth" with numerous perforations
in order to insure an uninterrupted circulation of heat beneath the vessels placed
upon them for cooking purposes.
The deflecting plates of our gas grill are made, by preference, of nickel, (although
sometimes, of other metal) as we find in practice that nickel plates are not oxidised
with gas flames so readily as iron ones and that they are capable of arresting
retaining and refracting a larger amount of useful heat than iron plates. We also
make our grill deflecting plates or panels, with conical shaped (perforated) ridges
in order to increase their heat arresting capabilities.
Dated this Fourteenth day of January 1891.
JOSEPH
LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Inventors.

page_text: zna. 10 reduce the consumption of gas therein;
3rd. To simplify the conversion of a deflecting gas
appliance:
66
grill" into a boiling
4th. To prevent the accidental fouling of burners in gas cooking appliances;
5th. To adapt the ribs or bars of a gas hob for being quickly and thoroughly
heated;
6th. To increase the heat arresting and refracting power of our "grill" deflecting
plates;
And we effect the said objects by the following means and mechanism
In carrying out our invention in connection with a gas cooking stove or appliance
we make the grilling mechanism of our gas cooker (when the said gas grill'
consists of three parallel tube burners placed horizontally between deflecting
panels) with a lever movement for oscillating the two outer tube burners thereof
and enabling their lighted jets to be turned beneath the deflecting panels for
grilling, or above them for boiling purposes, alternately as required, and when the
said outside burners are turned from their grilling positions to those required for
boiling, the supply of gas is simultaneously cut off from the middle burner, which
is a stationary one, by means of the said lever movement; also, when the two said
outside burners are revolved into their grilling positions the supply of gas is, by
means of the same lever movement, restored to the middle burner.
Either of the said transitions, together with the gas control, as named, is effected
with one backward or forward travel of the said lever movement.
We protect each jet piercing of our gas boiling rings and oven burners with a
small canopy or awning to prevent them being fouled and choked with grease or
other deposit during the process of cooking and we make the bars or ribs which
form the grated cover of our gas hob or "hot hearth" with numerous perforations
in order to insure an uninterrupted circulation of heat beneath the vessels placed
upon them for cooking purposes.
The deflecting plates of our gas grill are made, by preference, of nickel, (although
sometimes, of other metal, as we find in practice that nickel plates are not oxidised
with gas flames so readily as iron ones and that they are capable of arresting,
retaining, and refracting a larger amount of useful heat than iron plates. We
also make our grill deflecting plates, or panels, with conical shaped (perforated)
ridges in order to increase their heat arresting capabilities.
In order that our invention may be better understood and more readily carried
into effect, we have prepared the accompanying drawings illustrative of the
particulars comprising it, in which :-
with ribs or bars removed;
Figure 1 is a view in perspective, of a gas cooking hob;
Figure 2 is a plan, shewing the top of said "hob
Figure 3 is an end view in elevation, shewing our lever arrangement for
operating the "grill" burners etcetera ;
Figure 4 is a view in perspective of the "grill" burners and operating lever,
shewn in Fig. 3;
Figure 5 is an end view in elevation shewing our lever arrangement for operating
the "grill" burners;

page_text: Figure 6 is a view in perspective of the "grill" burners and operating lever,
shewn in Figure 5 ;
Figure 7 is a perspective view of a boiling ring for our gas cooking hob;
Figure 8 is a perspective view shewing a fragment of an improved rib or bar for
our gas cooking hob.
Figures 9 to 12 are perspective and sectional views illustrative of our improved
gas "grill" deflecting plates.
Similar letters of reference are employed throughout the said illustrations to
indicate corresponding parts.
66
Referring to Figures 1 and 2, the structure of our improved gas cooking hob is
shewn to consist principally of the open (frame) top plate A, united to the side
supports B and B₁; the ribs C are laid, loosely, upon the ledges c¹ and c³, the
'grill" burners D, D', and D' being fitted into the side support B and a cross
bar D, suitably for D¹ and D' being partially revolved upon the pins, d'; the
deflecting plates E and E' are fitted between the several burners D and the bar d³.
The ring burners F, F1 and F' are connected with, and supported by the several
parts of the structure and the whole apparatus is supplied with gas from the main
service pipe G, regulated and controlled by the range of taps g' to 9'.
The lever H, Figures 3 to 6, moving back and forward within the staples h¹ and h
and restrained by the stops h³ effects the partial revolution, in opposite directions
simultaneously, of the grill burners D' and D'. It also effects, when required, the
manipulation of the tap, 9, supplying gas to the burner marked D, simultaneously
with its oscillation of the burners D1 and D'.
The "grill" gas burners D' and D' are each provided with a pin (or other
member equivalent thereto) marked d and d³, for the purpose of engaging with
suitably formed, corresponding, parts upon the lever H as the latter travels back
and forward within the staples h¹ and 2, so that as the lever is thus moved, one
way or the other the said burners are partially revolved, first in the one way, as
shewn in Figures 3 and 5, and then in the opposite one, as shewn in Figures 4 and 6
and the finely pierced holes de, Figures 1 and 2 (for the gas jets) are thereby raised
above the upper surfaces of the deflecting plates E and E¹ or depressed beneath
their under surfaces for boiling grilling and other purposes.
The claw marked J, Figures 3, 4, 5 and 6 (or its equivalent), is for the purpose
of engaging with the handle g³ of the gas tap 9' and simultaneously turning the gas
(for the middle "grill" burner D) on or off. When it is preferred to operate the
gas tap g for the middle "grill" burner D, by hand, voluntarily, in the ordinary
way and not by the said lever H, we fit it with a tap like that marked g* in
Figures 1 and 2 and omit the handle 98.
In Figure 7 we have shewn one of our improved gas rings F' for the said "hob,"
with small projections or awnings, marked f³, for the purpose of shielding the
holes for the flame jets from becoming choked accidentally during the process of
cooking. We also make our burners for inside of ovens with these guards or
shields for the holes.
In Figure 8, which represents a fragment of our improved rib or bar C (Figure 1)
for a gas cooking hob, we shew the same, pierced with perforations, marked ct, for
enabling the bar to be more rapidly heated and the heat more readily diffused
beneath the utensils which are placed upon the hob for cooking operations.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
First. In a gas cooking hob, the combination of parts, all substantially as herein
described and shewn, for the purposes specified.
Second. In a gas cooking appliance the combination therewith of the lever H
and burners D, D' and D', constructed and operated all substantially as herein
described and shewn, or any mere modification thereof, for the purposes specified.

page_text: Third. In a gas cooking appliance the combination therewith of the lever H,
with or without the claw J, all substantially as herein described and shewn, or any
mere modification thereof for the purposes specified.
Dated the Thirtieth day of August 1891.
JOSEPH
LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Inventors.