Improvements in Dry Gas Meters.
Year: 1896

page_text: Date of Application, 5th Mar., 1896
1000
PROVISIONAL SPECIFICATION.
Improvements in Dry Gas Meters.
1, THOMAS HUGHES, of 26 Albion Road, Dalston, in the County of Middlesex,
Gas Meter Maker, do hereby declare the nature of this invention to be as
follows:-
The measuring chambers of dry gas meters commonly consist of two
compartments having rigid walls and each containing a collapsible gas holder
or bag.
These parts have heretofore usually been constructed more or less as one
structure and soldered together; this soldering is a difficult operation and involves
considerable risk of injury to the leather forming the sides of the collapsible bag.
I form the gas bag complete in itself and I fix it in its place without the use of
the soldering iron, by a screw union. The gas bag as I construct it consists of two
discs of tin plate flanged inwards and grooved around the face of the flange. The
cylinder of leather serving as the flexible part of the bag is received at its ends on
to the flanges of the discs and the leather is clamped on to the flanges by stout
wire rings.
The wire is balf round in section, the ends of the ring are bent out radially
and are brought together, and screwed; they receive a nut which draws the ring
tight causing it to clip the leather to the flange.
The disc at the inner end of the gas bag is provided with a radial neck or
inlet passage, to which an elbow bend is fixed; the bend carries upon it the nut
of the screw union and the nozzle part is one wall of the compartment which
contains the gas bag.
Or in place of the radial neck and the elbow connected therewith I can apply
the screw coupling at the centre of the disc of the gas bag; a ring with a screw
thread within it being arranged to screw on to a nozzle fixed upon the interior
wall of the meter and a passage being provided leading down from this nozzle to
the valve.
Dated this Third day of March 1896.
THOMAS HUGHES.
Improvements in Dry Gas Meters.
I, THOMAS HUGHES of 26, Albion Road, Dalston, in the County of Middlesex,
Gas Meter Maker, 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 measuring chambers of dry gas meters commonly consist of two
compartments having rigid walls and each containing a collapsible gas holder

page_text: These parts have heretofore usually been constructed more or less as one
structure and soldered together; this soldering is a difficult operation and involves
considerable risk of injury to the leather forming the sides of the collapsible bag.
I form the gas bag complete in itself and I fix it in its place without the use of
the soldering iron, by a screw union. The. gas bag as I construct it consists of
two discs of tin plate flanged inwards and grooved around the face of the flange.
The cylinder of leather serving as the flexible part of the bag is received at its
ends in to the flanges of the discs and the leather is: clamped on to the flanges
by stout wire rings. The wire is half round, in section, the ends of the ring are
bent out radially and are brought together and screwed; they receive a nut
which draws the ring tight causing it to clip the leather, to the flange.
The dise at the inner end of the gas-bag is provided with a radial neck or
inlet passage, to which an elbow bend is fixed, the bend carries upon it the nut of
the screw union and the nozzle part is one wall of the compartment which contains
the gas bag.
In order that my invention may be fully understood and readily carried into
effect, I will proceed to describe the drawings annexed.
Figure I shows a front view. of a dry gas meter in accordance with my invention,
it has the front plate.removed. and a portion is shown in section.
Figure 2 shows to a larger scale a sectional view of one of the collapsible gas
holders or bags, the section is taken on the line 2; 2; in Figure 1, a is one of
the measuring compartments, it is enclosed by rigid walls, one of which is the
front,plate which in the drawing is removed to expose the mechanism within;
bis the valve chamber containing valve mechanism of the ordinary description,
e is the front plate of a collapsible gas holder or bag contained within. the
chamber a. At the back of the meter are similar parts, viz. another compartment
with rigid walls similar to a and within it another collapsible gas holder or bag.
The gas holder or bag consists of two discs of tin plate, c and d each with. an
inwardly projecting flange e, the discs are connected by a cylinder of thin.flexible
leather, a part only of which is shown. The ends of the leather cylinder are
clipped to the flanges of the discs by rings of half round wire g, g, the ends of which
are bent outwards at g¹ g', they are brought together and have screw threads cut
upon them. The radial ends of the wire ring receive a screw nut h which as it is
screwed home closes the ring completely until it bears very tightly upon the
leather and clips the leather against the flange of the disc. The inner disc d of
the gas bag is provided:with a neck or inlet duct i which connects at a¹ with an
aperture in the flange of the disc d and is soldered securely to it. On to the neck i
a bend k is fixed which terminates in a screw union 1; by means of this union the
collapsible bag is adapted to a nozzle m at the entrance to the valve chamber
of the meter. The bend and the screw union is shewn in side view at Figure 3.
The valves are operated as usual by a spindle n an arm upon which is connected
by links to the outer disc c of the collapsible bag. pp, are a pair of rocking arms
on a spindle p¹, their ends enter slotted lugs q q fixed upon the plate e of the gas
bag; this is a usual arrangement to ensure that the two sides of the gas bag
shall inflate evenly.
MO
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed," I declare that what I
claim is :-
1. In a dry gas meter, collapsible gas-holders or bags, each made complete in
itself and connected in its place within the outer compartment, by a screw union,
substantially as described.
2. In a dry gas meter, collapsible gas holders or, bags, each consisting of two
discs flanged inwards, a leather diaphragm attached to the flanges, a neck or inlet
duct projecting from the flange of the inner disc, and an elbow bend fixed to the
neck and terminating in a screw union.

page_text: 3. Securing the leather diaphragm to the flange of the disc by an open clip ring
of half round wire, the ends of which are bent out radially, brought together, and.
adapted to receive a screw nut.