Improvements in Automatic Cut-offs for Gas Burners.
Year: 1897

page_text: Date of Application, 13th Dec., 1897-Accepted, 19th Feb.,
1898
COMPLETE SPECIFICATION.
Improvements in Automatic Cut-offs for Gas Burners.
I, PHILIP CHARLES FOLWELL, residing at 89, Cowan Avenue, in the City of
Toronto, in the County of York, and Province of Ontario, Commercial Traveller,
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:-
The object of this invention is to provide the burner of a gas-jet with a valve,
which will automatically close the passage through the burner after the light has
been extinguished, and to provide the valve with a heat influenced apparatus to
control its action, and to so arrange the several parts that they can be readily
applied to any gas-jet without requiring the alteration of any of the parts; and
the invention consists essentially of the device hereinafter more fully set forth and
more particularly pointed out in the claims.
In the drawings:
Fig. 1 is a perspective view of a gas-jet showing the cut-off applied.
Fig. 2 is a vertical section through the burner.
Like letters of reference refer to like parts throughout the specification and
drawings.
A represents the gas-jet; B the valve-casing of the jet A; C the valve working
within the valve-casing B; D the gas-pipe to which the gas-jet A is connected.
The end a of the gas-jet A is screw-threaded, and the gas-jet at the terminus
of the screw-threaded part is provided with a shoulder a¹. Fitted over the end a
and resting on the shoulder a¹ is the collar E of the supporting frame. The sup-
porting frame consists of a horizontal arm El extending horizontally from the end a
of the gas-jet, a standard E" integrally formed with the arm E¹ extending above
the top of the burner, and a horizontal arm E³ extending from the top of the
standard E over the nipple of the burner. The arms E¹, E³ are pre-
ferably formed integral with the standard. F represents a ring sustained by the
arm E. The top of the ring F is provided with an inward flange G. H represents
a diaphragm of thin sheet quickly expansible metal embraced by the ring F, and
prevented from moving upwardly by the flange G. Formed in the outer face of
the ring F are two diametrically opposed grooves I, I. J represents a frame con-
sisting of two bars j, j respectively crossed at the middle. The ends of the bars j¹
are provided with upward projections j", located in the grooves I, I, which act as
guides for them. The diaphragm H is made of an easily or quickly expansible
metal, whilst the ring F is made of a slowly expansible metal. The diaphragm H
s made to fit snugly, but not tightly, the inner side of the ring, and, when not
heated, normally rests on the frame J. When the gas-jet has been lighted the
liaphragm quickly responds to the action of the heat, expanding against the inner
ace of the ring, which limits the lateral expansion of the diaphragm, and causes it
o bulge towards the frame, and hold the frame in its downwardly drawn position,
s hereinafter specified.
The bar jis parallel with the under side of the arm E³, and extends to the edge
f the ring F. Suspended from the bar j is an arm K, which extends downwardly

page_text: parallel with the standard E. The lower end of the arm K is curved to extend
over the arm E¹, to which it is in close proximity. The curved end of the arm K
extends to a point near the burner, and extending upwardly from the end of the
curved arm K is a vertical arm L, the top of which is provided with a horizontal
collar M. Fitted on the screw-threaded end a of the gas-jet is a cylinder O, which
when screwed into position tightly holds the collar E between itself and the
shoulder a¹, and securely holds in position the supporting frame. The top of the
cylinder is provided with a screw-threaded projection P, and fitted on the top
of the projection P is a nut Q. The passage through the cylinder is in com-
munication with the passage through the gas-jet A. The passage through the
cylinder O is provided with a valve-seat R, at or about the middle of the cylinder.
Working within the cylinder is a piston valve S, which is adapted to be pressed
against the seat R and close the passage from the gas-jet A through the cylinder to
the burner. Extending upwardly from the piston valve S is a hollow valve-stem T,
and formed through the valve-stem T are perforations U. The top of the valve-
stem T is screw-threaded and fitted on the valve-stem is the burner V, provided
with the usual nipple W. The outer face of the burner V is screw-threaded, and
fitted on the burner is an adjusting-nut X. The collar M embraces the burner V
above the nut X. Within the cylinder O is a spring Y, which bears against the
under side of the valve S and the top of the end a of the jet. The tendency of
the spring Y is to force the piston valve upwards to close the passage from the
gas-jet to the burner.
The action of the parts is as follows: When it is desired to light the gas the
valve C is opened and the arm L is drawn downwards causing a simultaneous down-
ward movement of the collar M, which carries with it the burner V, valve-stem T
and valve S, opening the passage from the gas-jet to the burner, and allowing the
free passage of the gas from the gas-pipe D to the nipple W. The arm L when
moving downwardly carries with it the frame J, and the diaphragm H normally
resting on the frame moves with it. When the diaphragm has been influenced by
the heat from the flame it expands against the ring, and holds the frame in its
downwardly drawn position which holds down at the same time the piston-valve,
keeping open the passage through the cylinder to the burner and nipple. The
diaphragm is expanded and held in this position so long as influenced by the heat
from the ignited gas. Immediately the gas has been extinguished either by closing
the valve C or by blowing it out at the burner. the diaphragm rapidly cools, con-
tracts, and permits of the upward movement of the frame, and the parts suspended
from it, and also of the upward movement of the burner, the valve-stem and piston-
valve, which closes the passage through the cylinder. By this construction the
passage from the gas-burner to the nipple is effectually closed immediately after
the flame has been extinguished; thus preventing accidents and danger from the
escape of gas through the careless extinguishing of the light. To guide the arm K
in its upward movement it is provided with two lugs Z, which embrace the sides
of the standard E.
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 automatic cut-off for gas burners, hereinbefore described and illustrated
in the accompanying drawings.
2. An automatic cut-off for gas burners consisting of a valve held open by the
influence of the heat of the gas-flame, and means for automatically closing the
valve when the gas flame has been extinguished, substantially as specified.
3. An automatic cut off for gas burners consisting of a valve-controlled passage to
the burner, held open by the influence of the heat of the gas flame, and means for
automatically closing it when the flame has been extinguished, substantially as
specified.
4. An automatic cut-off for gas burners consisting of a passage to the burner

page_text: ng a valve-seat, a valve working within the passage, a spring to normally hold
the valve against the valve-seat, and a thermostat adapted to hold the valve away
from the valve-seat when influenced by the heat of the gas flame, substantially as
specified.
5. In an automatic cut-off for gas burners a thermostat consisting of a slowly
expansible frame, and a quickly expansible diaphragm, moveably held within the
frame, substantially as specified.
6. An automatic cut-off for gas burners consisting of a gas-jet, a cylinder con-
nected to the gas-jet having a valve-seat within it, a spring actuated valve within
the cylinder, a hollow valve-stem connected to the valve, having ports communi-
cating with the passage through the cylinder, a burner fitted on the valve-stem,
and a thermostat to hold the valve open, substantially as specified.
7. An automatic cut-off for gas burners consisting of a gas-jet, a cylinder con-
nected to the gas-jet having a valve-seat within it, a spring actuated valve within
the cylinder a hollow valve-stem connected to the valve having ports communi-
cating with the passage through the cylinder, a burner fitted on the valve-stem, a
thermostat to hold the valve open when influenced by the heat of the gas-flame,
and to allow the spring to close the valve against the valve-seat when the gas
flame has been extinguished, substantially as specified.
8. An automatic cut-off for gas burners consisting of a gas-jet, a cylinder con-
nected to the gas-jet having a valve-seat within it, a piston-valve working within
the cylinder, a spring bearing against the piston-valve and gas-jet to normally hold
the valve against the valve-seat, a hollow valve-stem connected to the piston valve
projecting through the cylinder, and having ports communicating with
the passage through the cylinder, a burner fitted on the valve-stem, a thermostat
consisting of a slowly expansible ring, a quickly expansible diaphragm loosely
mounted in the ring, a frame moveably connected to the ring, a hanger suspended
from the frame, and connected to the burner, substantially as specified.
9. An automatic cut-off for gas burners consisting of a gas-jet, a cylinder con-
nected to the gas-jet having a valve-seat within it, a piston valve working within the
cylinder, a spring bearing against the piston valve and gas-jet to normally hold the
valve against the valve seat, a hollow valve stem connected to the piston-valvo
projecting through the cylinder, and having ports communicating with the passage
through the cylinder, a burner fitted on the valve-stem, a thermostat embracing in
its construction a slowly expansible ring, and a quickly expansible diaphragm
loosely mounted in the ring, a frame moveably connected to the ring, a hanger
suspended from the frame, and connected to the burner, and an adjusting nut fitted
on the burner to regulate the action of the hanger from the thermostat, substantially
as specified.
Dated
10.1
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Annlicant