Improvements in or in connection with Gas-stoves.
Year: 1894

page_text: Date of Application, 14th Aug.. 1894
Complete Specification Left, 13th June, 1895-Accepted, 13th July, 1895
Improvements in or in connection with Gas-stoves.
A communication from ALFRED ROTHENBACH, of Zürich, in the Republic of
Switzerland, Director.
I, WILLIAM LLOYD WISE, of No. 46 Lincoln's Inn Fields, in the County of
London, Consulting Engineer and Chartered Patent Agent, do hereby declare the
nature of this invention to be as follows:-
This invention relates to gas-stoves and has for its object to prevent the useless
consumption of gas; and for this purpose the arrangement is such that the heating-
flame is allowed to burn only so long as a body to be heated is resting on the
stove, and that the said flame is automatically extinguished when the body is taken
off, even though for a short time only. This is effected by means of a valve
arranged in the gas-pipe leading to the burner of the stove, and of a contact-device
arranged in or adjacent to the stove in such a manner that according as the body
to be heated is placed upon the stove or is removed therefrom the contact-device is
caused to move in opposite directions and effects the opening or the closing, as the
case may be, of the aforesaid valve.
The accompanying drawing shows a vertical section, partly in elevation, of one
arrangement of gas-stove according to this invention.
In the gas-supply pipe a there is arranged between the shut-off tap 6 and
the burner c of the stove, a check-valve d, which normally shuts off the supply"
of gas to the burner c even though the tap b be opened. But when the
tap bis open, there is an uninterrupted supply of gas to a small igniting-
pipe which terminates just in front of the burner c and acts as a bye-pass
to maintain a small igniting-flame. When a body to be heated, such as a
cooking-pan e, is placed upon the stove, the said body presses down a rod f
which normally projects above the support g that carries the body to be heated;
a two-armed lever h, to one arm of which the rod f is connected, is thereby
oscillated in such a manner that the other arm of the lever is caused to come into
contact with a spindle i secured to the check-valve d and projecting out through
the casing thereof, and to raise the said spindle and lift the valve d from its seat,
whereby the gas is allowed free access to the burner c. The gas becomes at once
ignited by the small flame of the igniting-pipe z. When the body e that is resting
on the stove is taken off the latter, the lever h is caused by a suitable weight k to
move back into the position in which the pin fprojects above the support g, and
thus to release the valve d, which at once cuts off the supply of gas to the burner c
under the action of its own weight and of the pressure of the gas.
By this means the heating-flame is extinguished, even for short intervals of time,
during which the body to be heated is removed from the stove, so that useless
consumption of gas is prevented. A washer 1, furnished with packing-material
such as leather, or caoutchouc, may be arranged on the spindle i in such a manner
that if the valve d be raised, the washer will be pressed against the valve-casing
and thereby prevent escape of gas through the hole provided in the casing for the
passage of the spindle i. The tap is closed only when the stove is to remain out

page_text: of use during a considerable time, and in this case the small-igniting flame is also
extinguished.
Dated this 14th day of August 1894.
A communication from abroad by ALFRED ROTHENBACH, of Zurich, in the
Republic of Switzerland, Director.
I, WILLIAM LLOYD WISE, of 46 Lincoln's Inn Fields in the County
of London Consulting Engineer and Chartered Patent Agent, 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 has for its object to so construct gas stoves that useless con-
sumption of gas shall be prevented for which purpose, according thereto, the
arrangement is such that the heating-flame is allowed to burn only so long as a
body to be heated is resting on the stove, and that the said flame shall be
automatically extinguished when the body is taken off, even though for a short
time only. This is effected by means of a valve arranged in the gas-pipe leading
to the burner of the stove and of a contact-device arranged in or adjacent to the
stove in such a manner that according to whether the body to be heated is
placed upon the stove, or is removed therefrom the contact-device will be caused 'to
move in one direction or the other and will effect the opening or the closing as the
case may be, of the aforesaid valve.
The drawing filed with my Provisional Specification shows partly in vertical
section and partly in elevation, of a gas stove, provided with gas regulating apparatus
according to this invention.
In the gas-supply pipe a there is arranged between the shut-off: tap 6 and the
burner c of the stove, a check valve d, which normally shuts off the supply of gas
to the burner c even though the tap 6 be opened, but whilst the tap'b is open,
there is an uninterrupted supply of gas to a small igniting-pipe z which' terminates
just in front of the burner c and acts as a bye-pass to maintain alight a small
igniting-flame. When a body to be heated, such as a cooking-pan e, is placed
upon the stove, the said body presses down a rod or pin f, which normally projects
above the support g that carries the body to be heated and thereby partly rotates
a two-armed lever h, to one arm of which the rod f is connected, in such a manner
that the other arm of 'the lever is caused to come into contact with a spindle i
secured to the check-valve d' and projecting out through the casing thereof, and to
raise the said spindle and lift the valve d from its seat, whereby the gas is allowed
free access to the burner c whereupon the gas becomes at once ignited by the small
flame of the igniting-pipe z. When the body e is taken off the stove, the lever h is
caused by a suitable weight k to move back into the position in which the rod or
pin projects above the support g, and thus to release the valve d, which at once
moves back and 'cuts off the supply of gas to the burner c under the action of its
own weight and of the pressure of the gas.
By this means the heating flame is extinguished, during the times (even if only
momentary) when the body to be heated is removed from the stove, so that useless
consumption of gas at such times is prevented. A washer 1, furnished with
packing-material such as leather or caoutchouc, may be arranged on the spindle i

page_text: in such a manner that when the valve d is raised, the washer will be pressed
against the valve-casing and thereby prevent escape of gas through the hole
provided in the casing for the passage of the spindle i. The tap 6 is closed only
when the stove is to remain out of use during a considerable time; and in this
case the small igniting-flame is also extinguished.
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 gas heating apparatus for stoves of the kind in which the gas supply is
automatically turned on when the body to be heated is placed on the stove and cut
off when the body is removed from the stove, a valve d that is arranged in the gas
supply pipe, and carries an extension, such as a pin or stud i adapted to be raised
by a part or device or combination of parts or devices, such for example as the
lever h and the rod or pin f, when the body to be heated is placed upon the stove
so as to then open the said valve and permit gas to flow to the burner, in com-
bination with a separate gas supply pipe z that is unaffected by the opening and
closing of the said valve, and whose outlet is situated near the burner, so that a
separate permanent igniting flame can be maintained thereat independently of the
heating-gas supply, substantially as described.
2. Gas heating apparatus constructed arranged and operating as shown in and
described with reference to the drawing herein referred to.
Dated this 13th day of June 1895.
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.