Year: 1897

page_text: Date of Application, 30th June, 1897-Accepted, 4th Sept., 1897
I, WILHELM JOSEPH' SCHMITZ, Manufacturer, of 61 Alter Steinweg, Hamburg,
Germany, 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:-
This invention relates to gas cookers and it has for its object to improve their
construction.
With my invention the consumption of gas is reduced to a minimum the flame
being only allowed to burn so long as the cooking vessel remains on the grate and
as soon as it is removed the heating flame is automatically extinguished and only
a small pilot jet sufficient to relight the heating flame allowed to continue burning.
And in order that my said invention may be properly understood I have
hereunto appended by way of example an explanatory drawing showing in vertical
section a gas cooker having my invention applied thereto.
Referring to the drawing:-
a is the gas supply pipe which cau, as shown, be also used as a means for
supporting the whole mechanism and attaching it to the frame. From the pipe a
the gas passes up through the passage b to the chamber c which is normally closed
by means of a valve d acted on by a spring f. i is a small lateral chamber
communicating with the chamber and which can be closed by means of a screw
down valve s. When the valve is opened gas passes up the nozzle to the pipe u
in which it is mixed with air. The mixture can be ignited at v so as to give a
small pilot jet
C
r is a knob fitted on the top of a vertical rod which is normally pressed upwards
and away from the rod g of the valve d by the action of the spring k.
When cooking, the cooking vessel is placed on the grate t of the plate w, and,
as a consequence, it, at the same time, presses down the knob and rod against
the action of the spring k. The downward movement of the rod h forces down the
rod and opens the valve d so that gas from the chamber c immediately
passes upwards into the chamber from whence it escapes through a number of
small passages m into the mixing chamber n where it is mixed with air entering
at the holes o as indicated by the arrows. The mixture passes upwards through
wire gauze P
and escapes
at the circular opening a where it is ignited by the small
pilot jet v.
Whenever the cooking vessel is taken off the grate the spring k forces up the
rod to its original position, whilst, at the same time, the spring f automatically
closes the valve d and cuts off the gas supply to the burner q.
The pilot flame v can be kept constantly burning so as to automatically ignite
the heating burner 9 whenever a pot or other utensil is placed on the grate t.

page_text: "
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
consider novel and desire to claim is:-
1. A gas cooker having a heating flame which can be automatically extinguished,
wherein the gas supply valve (d) is opened through a suitable mechanical arrange-
ment by the mere setting of the cooking vessel upon the grate and, after the
cooking vessel has been removed; is automatically closed by means of a spring or
equivalent arrangement, substantially as set forth.
2. The combination with a gas cooker as claimed in Claim 1, of a pilot burner
consisting of a pipe (u) and nozzle (r) for igniting the heating burner whenever
the gas supply valve (d) is opened substantially as hereinbefore described and
shown on the drawings annexed.
3. The general arrangement and combination of parts of the automatically
ignited gas cooker substantially as hereinbefore described and shown on the
drawings annexed.
Dated this 26th day of June 1897.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent..