IMPROVEMENTS IN THE DIAPHRAGMS OF DRY GAS METERS
Year: 1885

page_text: I, JOHN SOMERS of 8 St. Leonard Hill, Edinburgh, in the County of Midlothian,
North Britain, Foreman Gasfitter do hereby declare the nature of the said
invention for IMPROVEMENTS IN THE DIAPHRAGMS OF DRY GAS METERS to be as
follows:-
This Invention relates to improvements in the diaphragms of dry Gas Meters
and consists in the employment of a jointed diaphragm of metal or other suitable
material placed inside the ordinary diaphragm, or the said jointed diaphragm may
be used as the ring or frame to which the ordinary diaphragm is attached, the
object of such an arrangement being to keep the diaphragm distended, thus
preventing the bending over or lapping thereof so that the diaphragm shall always
be of an uniform capacity and give an equal registration, and not being affected to
any extent either by the quantity of Gas passing through the meter or the pressure
at which the Gas is being delivered.
J. H. JOHNSON, DAY & JOHNSON,
Petitioner's Agents.

page_text: virtually a second diaphragm situated within the ordinary diaphragm, or the said
jointed pieces may be used as the ring or frame to which the ordinary diaphragm
is attached, the object of such an arrangement. being to keep the ordinary
diaphragm distended, thus preventing the bending over or lapping thereof so that
the diaphragm shall always be of an uniform capacity and give an equal registration,
and not being affected to any extent either by the quantity of gas passing through
the meter or the pressure at which the gas is being delivered.
In order that my said Invention may be properly understood and readily carried
into effect, I will now proceed to describe the drawings hereunto annexed.
Figure 1, is a view of that part of a dry gas meter shewing partly in side
elevation and partly in section, the improvements constituting my Invention.
Figure 2, is a front elevation of the same with part of the ordinary diaphragm
removed.
Figure 3, is a transverse section of the same.
In a Dry Gas Meter constructed according to my present Invention, I provide the
tin or equivalent disc a, the leather or other flexible diaphragm b, and the plate c, all
as in an ordinary dry gas meter the plate c, representing the centre vertical division
of such dry gas meter. To each side of this plate c, as is well known, the parts a,
and b, are applied although I have shewn but one of such parts only on the
annexed drawings as being sufficient to illustrate my Invention. The disc a; and
the plate c, are, according to my Invention, connected together by a series of
hinged strips d, the shape of which, as shewn upon the annexed drawings, is such
as maintains the flexible diaphragm b, in a distended condition.
To the disc a, there is soldered or otherwise secured the crank which is some-
times known as the "flag" and which communicates motion to the valves and
index of the meter in a manner common to dry gas meters generally.
Having now particularly described and ascertained the nature of my Inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
The improvements in dry Gas Meters consisting of the hinged strips d, con-
stituting virtually a second diaphragm within the ordinary diaphragms b, and
connecting the disc a, and plate c, as herein before described and shewn on the
annexed sheet of drawings.