Improvements in Automatic Cut-offs for Gas-burners
Year: 1892

page_text: COMPLETE. SPECIFICATION:.
Improvements in Automatic Cut-offs for Gas-burners:
A communication from ELI DENNE, of the Town of Newmarket, in the County
of York, in the Province of Ontario, Canada; Millwright:
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Member of the Institution of Mechanical 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:-
The object of the invention is to design a simple device by which the gas
cock will be instantly cut off upon the gas being blown out, and it consists essen-
tially of a notched quadrant fixed to the gas cock and actuated by a spring set to
hold the cock closed, a balanced lever holding a globe to surround the burner and
arranged in connection with the notched quadrant in such a manner that when
the cock is turned on, it is held open by its connection with the balanced lever, which
connection is instantly broken when any serious attempt is made to blow out the
gas, and when broken, the tension of the spring cuts off the gas by closing the
cock substantially as hereinafter more particularly explained.
The drawing represents a perspective view of the improved cut-off applied to a
gas burner.
A represents a notched quadrant fixed to the gas-cock B, and C represents a
spring connected to the cock B or quadrant A in such a manner that the tension
of the said spring shall hold the cock closed, but is sufficiently pliable to permit
the said cock to be opened when necessary.
My correspondent does not clain any particular kind of spring nor does he
limit himself to any special location for it. The only thing to be observed is to
see that the spring is such that when not otherwise prevented, it will instantly
close the cock.
D is a pivotted lever supporting at one end a disc E on which the globe F is
carried.
On the opposite end of the lever D is placed an adjustable weight G which may
be readily moved so as to counterbalance the weight of the disc E and globe F,
so that the lever may be made to rock on its pivot by the force of any draught
sufficiently strong to blow out the gas.
H is a vertical pin held in suitable bearings and flexibly connected to the
lever D as indicated. The bottom end of the pin H rests upon the notches formed
on the quadrant A so that when the cock B is opened, the said pin will engage with
one of the notches and hold the cock open notwithstanding the tension of the
spring.
A vertical guide I is provided so as to hold the disc E exactly in the centre of
the burner.
With this improved cut-off the gas is turned on and lighted as usual but the
moment that any attempt is made to blow out the gas the lever D is rocked on its
pivot sufficiently to raise the pin H clear of the notch with which it may at the
time be engaged, when by the action of the spring C, the cock B will be instantly
turned so as to cut off the gas.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is,
1. A pivotted lever one end arranged in proximity to the gas burner and the
other end in proximity to the gas-cock in combination with a spring arranged to
actuate the gas cock and means for connecting the pivotted lever to the cock by

page_text: which the rocking of the lever on its pivot will cause the spring to close the cock
substantially as and for the purpose specified.
2. A notched quadrant A connected to the gas cock B which is actuated by the
spring C in combination with the lever D supporting the globe F on the disc E
in combination with the weight G. and pin H substantially as and for the purpose 5
specified.
Dated thin 07th don of In 1800
ALFRED J. BOULT,
Chartered Patent Agent.