Year: 1887

page_text: Date of Application, 4th Apr., 1887
Complete Left, 4th Jan., 1888
Complete Accepted, 16th Mar., 1888
1 GEORGE TEIDEMAN of 27 Lancaster Street, Borough Road in County of Surrey
Brass Founder do hereby declare the nature of this invention to be as follows:-
My invention relates to that class of liquid meter in which there are two chambers in
each of which works a piston or diaphragm and into which the liquid is passed in and
out by valves-The movements of the valve of one chamber being controlled by the
movement of a rod passing from the piston or diaphragm of the other chamber.
One chamber 1 form as heretofore of larger dimensions than the other—the smaller
chamber being used only for the purpose of shifting the valve of the larger chamber-
The two chambers I place preferably at right angles to one another. The larger
chamber being placed vertically and the smaller chamber horizontally above it.
The piston or diaphragm rod passing out from the top of the larger chamber I cause
to act alternately on the two arms of a rocking lever which are somewhat inclined the
one to the other. This lever I couple by a link to a slide valve which controls the
passage of liquid to and from the smaller chamber.
As the rod makes its outward stroke it rocks the lever above mentioned and
causes it to shift the slide valve of the smaller chamber so as to admit liquid to the
rear end of this chamber-The pressure of liquid on the back of the diaphragm or
piston in the chamber then tends to force the diaphragm or piston rod outwards but it
is restrained from doing so by a locking arrangement which holds it back until the
piston or diaphragm of the larger chamber has made its full stroke-One way in which
this may be effected is as follows:-
The rod of the piston or diaphragm of the smaller chamber has a bar fixed to it at
right angles this bar comes against another bar fixed to the rod of the piston or
diaphragm of the larger chamber parallel with it--but when by the movement of this
rod the bar upon it is carried past the bar on the rod of the smaller chamber the rod of
the smaller chamber is free to be forced outwards by the pressure of the liquid and
then at once and quickly the valve of the larger chamber is moved so as to cause the
diaphragm or piston working in it to be driven in the opposite direction to that in

page_text: which it was before moving-As the rod of the larger chamber moves back it again
shifts the rocking lever so shifting the valve of the smaller chamber and admitting fluid
to the front end of this chamber to press upon its piston or diaphragm in a direction to
again reverse the position of the valve of the larger chamber but it is prevented from
doing so by the bar which is affixed to its rod again bearing against the bar carried by
the rod of the larger chamber-but on the opposite side of it so that the valve of
the larger chamber cannot be shifted until its rod has again completed its stroke-
In this way great accuracy of measurement is ensured.
The valves I use are preferably slide valves of the ordinary kind working horizon-
tally The exhaust ports from the two chambers I lead to one common outlet and the
supply ports are alternately opened to the interior of the meter casing which is kept
supplied with liquid through a liquid supply pipe-The movements of the piston or
diaphragm rods are recorded by suitable recording mechanism.
Dated this 4th dove at t
1007

page_text: I, GEORGE TEIDEMAN of 27 Lancaster Street, Borough Road in the County of
Surrey Brass Founder 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 :-
My invention relates to that class of liquid meter in which there are two chambers in
each of which works a piston or diaphragm and into which the liquid is passed in and
out by valves. The movements of the valve of one chamber being controlled by the
movement of a rod passing from the piston or diaphragm of the other chamber.
One chamber I form as heretofore of larger dimensions than the other-the smaller
chamber being used for the purpose of shifting the valve of the larger chamber. The
two chambers I place preferably at right angles to one another. The larger chamber
being placed vertically and the smaller chamber horizontally above it.
The piston or diaphragm rod passing out from the top of the larger chamber I
cause to act alternately on the two arms of a rocking lever which are somewhat
inclined the one to the other. This lever I couple by a link to a slide valve which
controls the passage of liquid to and from the smaller chamber.
As the rod makes its outward stroke it rocks the lever above mentioned and causes it
to shift the slide valve of the smaller chamber so as to admit liquid to the rear end of
this chamber. The pressure of liquid on the back of the diaphragm or piston in the
chamber then tends to force the diaphragm or piston rod outwards but it is restrained
from doing so by a locking arrangement, which. holds it back until the piston or
diaphragm of the larger chamber has made its full stroke-One way in which this
may be effected is as follows:-
The rod of the piston or diaphragm of the smaller chamber has a bar fixed to it at
right angles this bar comes against another bar fixed to the rod of the piston or diaphragm
of the larger chamber parallel with it but when by the movement of this rod the bar
upon it is carried past the bar on the rod of the smaller chamber the rod of the smaller
chamber is free to be forced outwards by the pressure of the liquid and then at once
and quickly the valve of the larger chamber is moved so as to cause the diaphragm or
piston working in it to be driven in the opposite direction to that in which it was
before moving-As the rod of the larger chamber moves back it again shifts the rocking
lever so shifting the valve of the smaller chamber and admitting fluid to the front end
of this chamber to press upon its piston or diaphragm in a direction to again reverse
the position of the valve of the larger chamber but it is prevented from doing so by
the bar which is affixed to its rod again bearing against the bar carried by the rod of
the larger chamber but on the opposite side of it so that the valve of the larger
chamber cannot be shifted until its rod has again completed its stroke-In this way
great accuracy of measurement is ensured.
The valves I use are preferably slide valves of the ordinary kind working horizon-
tally The exhaust ports from the two chambers I lead to one common outlet and the

page_text: supply ports are alternately opened to the interior of the meter casing which is kept
supplied with liquid through a liquid supply pipe-The movements of the piston or
diaphragm rods are recorded by suitable recording mechanism.
In order that my said invention may be more fully understood and readily carried
into effect I will describe the drawings hereunto annexed.
Figure 1 is a vertical section of a meter fitted with two diaphragm pistons the
line of section being the centre line of the piston rods, the piston rods being shown
in full.
Figure 1 is a similar section to Figure 1. the parts being shown in the position they
assume when the diaphragms are at the extreme of the outstroke.
Figure 2 is a plan of the same with the top portion of the cover cut away.
Figure 3 is a plan of the centre casting of the shell showing the inlet and outlet
orifices and the passages leading thereto.
Figure 4 is the front elevation of the meter with the counter removed to show the
ratchet gear by which the counter receives its motion.
Figure 5 is the back elevation of the meter with the cover removed and a portion of
the shell of the large chamber cut away to show the back of the small chamber
and its valve.
Figure 6 is the front elevation of the meter with the cover removed to show the
rocking lever which actuates the valve and regulates the flow of water to the small
piston, it also shows the valve which regulates the flow of water to the large piston.
Figure 7 is a similar section to Figure 1 and shows a modified form of meter.
In all these figures like letters of reference refer to like parts.
The large chamber is made in two pieces A. A¹ bolted together with a diaphragm B
between them. A cover A2 bolted onto the piece A' forms a chamber or reservoir for
the water supply, it also contains the valve mechanism.
The diaphragm B is clamped to a piston rod C by two plates B₁ B¹ the piston rod C
working through a stuffing box Cx. On the other end of the piston rod Ĉ is a bar or
stop and projections (C
The small chamber is made in two parts D D¹ bolted together with a diaphragm E
between them, this diaphragm is clamped to a piston rod F by two plates E¹ E'.
The piston rod F works through a stuffing box F* and outside the stuffing box
carries a stop F¹.
Water is supplied to the upper chamber or reservoir through the inlet pipe I it
passes up through the grating into the interior of the casing.
The large chamber has supply ports a a¹ leading into it one on either side of the
diaphragm and a discharge port a²; the ports a a¹ are alternately covered by a
valve G.
The small chamber has supply ports d d leading into it one on either side of the
diaphragm and a discharge port d²; the ports d d are alternately covered by a
valve H.
The valve G is moved by the piston rod F by the link F' being kept on its seat by
the bar Gand the valve H is moved by the rocking lover J acting on the link H¹
this valve is kept on its seat by the bar H³.
The position in which the parts are shown in Figure 1 is when both pistons have just
completed their outward stroke and the valve G has uncovered the port a to the
reservoir and closed a¹ from the reservoir but opened it to the outlet O by the port a².
Water can now pass to the under side of the piston or diaphragm B which immediately
commences to rise, this movement causes the bar or stop C to pass up in front of the
bar F on the piston rod F which is thus locked further movement of the piston B
causes the projection C to come against the face of the top end of the rocking lever J
the end of which towards the last part of its movement comes against the inner end of
a slot formed in the link H' this now moves the valve H closing the port from the
reservoir but opening it to the outlet O by the port d² and uncovering the port d

page_text: admits water behind the small piston or diaphragm E forcing it outwards,
it however cannot move until the bar or stop C has moved clear of the bar or
stop F
So soon as they are clear the small piston moves the valve H which
closes the port à from the reservoir opening it to the discharge port a², it also
uncovers the port a admitting water to the top of the diaphragm or piston B this at
once commences to move downwards the bar or stop C₁ coming behind the bar or
stop F again locks the small piston, further movement of the piston causes the
projection C² to come against the face of the bottom end of the rocking lever J the end
of which towards the last part of its movement again uncovers the port d¹ and thus an
intermittent to and fro motion is given to the pistons the small one being always locked
by the large piston until the latter has completed its stroke. It will be seen that at
each stroke up and down of the diaphragm both the large and small chambers
discharge a quantity of water equal to the capacity of both chambers into the outlet
passage O. In order that the number of strokes may be registered and in this way the
quantity of water delivered recorded the projection C³ on the piston rod C comes
against first one end and then the other end of a lever K keyed on a spindle L which
works in a stuffing box in the upper portion of the reservoir case see Figures 1 and 4.
On the outer end of this spindle is another lever K¹ to which is attached a weighted
ratchet pawl K2 working into the teeth of the ratchet wheel K³ and imparting motion
to it, a stationary pawl K prevents backward movement of the wheel. The ratchet
wheel K has a bevil wheel attached to it and this gives motion to a pinion M
see Figure 1 fixed to a worm which gears into a worm wheel giving motion to an
ordinary meter recording mechanism having a dial face and pointers.
In Figure 7 I have shown a modified form of meter-In this meter in place of
diaphragms I employ pistons with double cup leathers. The movement of the parts
and the mode of locking the small piston rod is identical with that of the other meter
the form of the parts being slightly altered to suit the modified form.
In some cases I prefer to use cup leathers for the large piston and a diaphragm for
the small and in others cup leathers for the small piston and a diaphragm for the
large.
It will be understood that I do not confine myself to the locking arrangements which
I have above described as it is obvious that other methods of locking can be applied.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. The construction of liquid meters substantially as heroin before described and
illustrated in the drawings annexed.
2. The construction of liquid meters having two chambers wherein the piston or
diaphragm of one chamber is locked and restrained from making its stroke until a
defined stroke of the piston or diaphragm of the other chamber has been made.
Dated this
day of January 1888.
CARPMAEL & Co.,
Agents.