Improvements in or connected with Dry Gas Meters.
Year: 1892

page_text: Date of Application, 23rd Feb., 1892-Accepted, 9th Apr., 1892
COMPLETE SPECIFICATION.
Improvements in or connected with Dry Gas Meters.
I FRANK WRIGHT of 11 and 12 Little Queen Street in the City of
Westminster Gas Engineer 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 objects of this invention are to provide a means whereby the leathers of dry
gas meters may be more easily and cheaply attached to the metal heads or discs
and rims than by the present method of wrapping with wire or string and also to
lessen the cost of manufacture of the said discs and rims by doing away with the
soldered joints now used.
Now according to this invention I form the heads of the bellows of dry gas
meters from one piece of metal by stamping and spinning each head has a V shaped
groove round the periphery thereof into which the leather is drawn and secured by
means of a wire or wires or other suitable means.
And in order that my said invention may be clearly understood I will proceed
to explain the same with reference to the accompanying sheet of drawings in
which :-
Fig. 1 represents a view partly in section of the bellows of a dry gas meter
constructed according to this invention.
Fig. 2 is a partial section of the head of the same to an enlarged scale.
The same letters denote the same parts in both figures.
a is the partition and a' the gas inlet b and c the bellows whereof the former is
shewn in section d is the outer and e the inner head which is secured to the
partition a by solder or other suitable means.
The heads d and e are pressed or stamped from sheets of suitable metal and after-
wards spun over a suitable mould to form the V shaped groove f therein. To
prevent the edges of the heads from cutting the leathers I prefer to bead the same
as shewn at g or they may be simply turned over to a right angle.
I may also strengthen the heads when required by corrugating or dishing the
same or by dishing and corrugating as shewn on the drawing.
I prefer to form the moving head d with a hole in the centre thereof through
which is introduced an inflated bag or mould over which the leathers are stretched.
When the leathers are secured the mould is removed and the hole closed by a patch
piece / soldered to the head d. To secure the leathers kk to the heads d and e
I place the inflated mould in position between the heads stretch the leather over
the same till quite tight and when tight I draw the leathers k k into the grooves f
by means of flexible wires or strings. One end of each wire or string is secured to
the studs (which are attached to the heads de) and two or more convolutions of
the wire or string passed round the leather sufficient tension being kept on the wire
to draw the leather well down into the grooves the other end of the wire or string is
then twisted or tied round the stud 1 and cut off a nut m is placed on the said stud
and screwed down tight on to the wire or string. By this means a perfectly gas-
tight joint is made between the leather and the head with a minimum expenditure
of labour and will be found much more satisfactory than the present joint made by
wrapping with wire on a flat surface.
It is only necessary to tack the heads e e to the partitions in about four places
and connect by means of a small channel pipe n to the proper port in corresponding
valve.

page_text: 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
I. Forming the heads or discs of the bellows of dry gas meters with ▼ shaped
grooves therein as and for the purpose specified.
II. Forming the heads or discs of the bellows of dry gas meters from one piece
of metal by stamping or pressing and spinning substantially as described.
III. The improved method of securing the leathers of dry gas meter bellows to
the heads or discs thereof substantially as described and shewn.
1
1003
ERNEST SALAMAN,
Patent Agent to the British and Foreign Patents and Trade Marks Society,
61 & 62, Chancery Lane, London, Agent for Applicant.