provements in Apparatus for Regulating the Supply of Air to Boiler and other Furnaces.
Year: 1891

page_text: Date of Application, 21st Jan., 1891
Complete Specification Left, 20th Oct., 1891-Accepted, 21st Nov., 1891
PROVISIONAL E MUITIGATION
Improvements in Apparatus for Regulating the Supply of Air to
Boiler and other Furnaces.
We, EDWARD COVERLY, of 49, Stepney Green, Mile End, in the County of
London, Engineer, and SEPTIMUS EDMUNDUS CARLISLE, of the Thatched House
Club, St. James's, in the County of London, Gentleman, do hereby declare the
nature of this invention to be as follows:-
This invention relates to apparatus of the kind described in the Specification of
Letters Patent No. 4440 of 1874 for regulating the supply of air to furnaces.
In such apparatus there is employed a cylinder and cup for containing mercury
for regulating the closing of the valve which directly controls the air supply.
In practice it is found that owing to the oxidation of the mercury the cup some-
times becomes fixed, and thus renders the apparatus as a whole inoperative.
Endeavours were made to obviate this disadvantage by the means described in
the Specification of Letters Patent No. 1053 of 1880, but such means were only
partially successful.
According to this invention the cup is constructed in such a manner that there
will be little liability of the apparatus being rendered inoperative owing to oxida
tion, and at the same time means are provided whereby the air valve may be.
immediately closed by hand without injuring the apparatus in case the same has
been opened when not required.
In carrying out this invention the cup is provided with a central tube fitting
loosely over a guide spindle and in the bottom of the cup are two spring valves.one
of which opens inwards and the other outwards. The outwardly opening valve
opens when unsupported under the weight of the mercury in the cup and the
inwardly opening valve only opens under an abnormal pressure upon the cup. "
1001
:
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants..
COMPLETE
SPECIFICATION.
Improvements in Apparatus for Regulating the Supply of Air to
Boiler and other Furnaces.
We, EDWARD COVERLY, of 49, Stepney Green, Mile End, in the County of
London, Engineer, and SEPTIMUS EDMUNDUS CARLISLE, of the Thatched House
Club, St. James's, in the County of London, Gentleman, 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 apparatus of the kind described in the Specification of
Letters Patent No. 4440 of 1874 for regulating the supply of air to furnaces.
In such apparatus there is employed a cylinder and cup for containing mercury
for regulating the closing of the valve which directly controls the air supply.
In practice it is found that owing to the oxidation of the mercury the cup
sometimes becomes fixed, and thus renders the apparatus as a whole inoperative.
Endeavours were made to obviate this disadvantage by the means described in
the Specification of Letters Patent No. 1053 of 1880, but such means were only
partially successful.
According to this invention the cup is constructed in such a manner that there
will be little liability of the apparatus being rendered inoperative owing to oxidation,
TD cer

page_text: and at the same time improved means are provided whereby the air valve may be
immediately closed by hand without injuring the apparatus in case the same has
been opened when not required.
In carrying out this invention, the cup is provided with a central tube fitting
loosely over a guide spindle, and in the bottom of the cup are two spring valves one
of which opens inwards and the other outwards. The outwardly opening valve
opens (when unsupported) under the weight of the mercury in the cup, and the
inwardly opening valve only opens under an abnormal pressure upon the cup.."
To enable our invention to be fully understood we will describe how it can be
carried into practice by reference to the accompanying drawings, in which :-
Figure 1 is a central vertical section of the cylinder of an apparatus for regulating
the supply of air to boiler and other furnaces, the mercury cup of such cylinder
being constructed according to our invention.
Figure 2 is a horizontal section on the line of Figure 1.
a is the usual cylinder containing our mercury cup b;
is the central tube which
we fit loosely over the guide spindle d, the said tube being connected by the usual
connecting rod e to the air valve (not shewn in the drawings), f is the usual
weight supported on the tube c, and y the hole in the bottom of the mercury
cup, through which hole the mercury is designed as heretofore to flow when
the cup falls by gravity.
hand are the spring valves with which we provide the mercury cup b, the
said valves being arranged over openings j and respectively in the bottom of
the cup. The valve serves to allow the mercury to flow from the cup into
the cylinder, when the said cup is lifted by the air valve being opened, and the
valve allows the mercury to flow back into the cup without passing through
the hole when the cup is lowered by operating the air valve by hand.
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 :--
1. In apparatus for regulating the supply of air to boiler and other furnaces
providing the mercury cup with two spring valves opening in opposite directions as
and for the purpose described.
2. In apparatus for regulating the supply of air to boiler and other furnaces, the
combination with a mercury cup having two spring valves, of a hollow guide
spindle fitting loosely in the central tube as and for the purpose described.
3. The manufacture and use of the improved apparatus for regulating the supply
of air to boiler and other furnaces hereinbefore, described and illustrated in the
accompanying drawings.
Dated the 20th day of October 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.