An IMPROVED WATER METER
Year: 1884

page_text: I, JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County
of Middlesex, Consulting Engineer and Patent Agent do hereby declare the nature
of my invention for "An IMPROVED WATER METER " to be as follows:-
This invention relates to water meters of the kind in which two pistons are
moved alternately up and down in adjoining cylinders, each piston working a slide
which governs the supply and discharge of the fluid that acts on, the other piston.
I will explain the improved construction, according to this invention, referring to
the accompanying drawings, and to the figures and letters marked thereon. Fig. 1
is a vertical section and Fig 2 is a sectional plan on Z Z. The two cylinders A A
are cast in one piece with the passages a a leading one to the bottom of each; and
each cylinder has a brass lining b and is fitted with a packed piston B sufficiently
deep to form its own guide. In the centre of each piston is a sleeve giving play
for the head of a slide rod C which is moved by the end of the sleeve bearing
against it as the piston is approaching each extremity of its stroke. The slide
rod C passes through packing E up into the cavity D and terminates in a frame F
within which is engaged the slide G pressed against the facing by a spring c, which
may be a bent strip of metal or may be a piece of caoutchouc. One of the frames F
carries a pawl d which, at every stroke of the slide, moves, one tooth a ratchet
wheel H that works a counter. The recess of the frame F may be made longer
than the slide G as shewn in Fig. 3, the slide in that case being made with a recess M
on its back receiving a caoutchouc ball or roller N. Each slide G governs the
passage of water to and from cavities in a piece J, on which are formed the slide
facings, the cavities in J being so arranged as to communicate with the two
cylinders A A as indicated by the numerals marked on the parts and passages; the
middle cavity f communicating with the discharge K. Sometimes it is found
convenient to arrange the counter as shewn in Fig. 4, with its glass face N presented
at an angle of 45°, and also to provide means of testing the tightness. of the
packings and joints. In this case, the pawl g, which works the ratchet wheel H
of the counter, is arranged, as shewn in elevation at Fig. 5, with a tail h so as to
butt against a stationary stop a, causing the pawl to engage with the ratchet with
.

page_text: certainty as the slide rod which carries the pawl completes its upstroke. For the
purpose of testing tightness, one of the slides T¹ has, on its back, teeth engaging
a worm N on the slide rod P¹. The upper end o of the rod is made square or
polygonal fitting into a socket piece Q which passes through packing and can be
turned from outside. By turning this. socket piece Q the slide T¹ can be shifted
upwards or downwards relatively to the rod P¹ to such an extent that it will fail
to alternate the supply and discharge; the pistons will therefore remain at rest,
and the counter will cease to move, and it will be known that if fluid nevertheless
pass through the apparatus, it must be owing to leakage. Instead of moving the
slide for this purpose, the facing on which it works may be made moveable as
indicated in Fig. 6, and it can be shifted by a screw, or otherwise worked from
outside the apparatus.
D
201
2
1001
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.
I, JOHN IMRAY of N° 28 Southampton Buildings, Chancery Lane, in the county
of Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of my invention for "AN IMPROVED WATER METER" to be as follows:-
This invention relates to water meters of the kind in which two pistons are
moved alternately up and down in adjoining cylinders, each piston working
a slide which governs the supply and discharge of the fluid that acts on the other
piston. I will explain the improved construction according to this invention,
referring to the accompanying drawings, and to the figures and letters marked
thereon. Fig 1 is a vertical section and Fig 2 is a sectional plan shewing the
passages governed by the slide. The two cylinders A A are cast in one piece with
passages a³ a leading, one to the bottom of each; and each cylinder has a brass
lining 6 and is fitted with a packed piston B sufficiently deep to form its own
guide.
"
In the centre of each piston is a sleeve giving play for the head of a slide rod C.
which is moved by the end of the sleeve bearing against it as the piston is
approaching each extremity of its stroke The slide rod C. passes through pack-
ing E up into the cavity D and terminates in a frame F within which is engaged
the slide G, which is pressed against the facing by a spring c. This spring may be,
as shewn, a bent. strip of metal or it may be a piece of caoutchouc. One of the
frames F carries a pawld which at every stroke of the slide, moves one tooth
a ratchet wheel H, that works a counter. The stroke of the slide is such that it
causes the pawl to take one tooth of the ratchet, but not more. In order to get
full stroke for the pawl, the recess of the frame F may be made longer than the
slide G as shewn in Fig 3, the slide in that case being made with a recess M in its

page_text: back receiving a caoutchouc ball or roller N. Each slide G governs the passage of
water to and from cavities in a piece J, on which are formed the slide facings, the
cavities in J being so arranged as to communicate with the two cylinders A. A as
indicated by the numerals marked on the ports and passages; the middle cavity f
communicating with the discharge K. Sometimes it is found convenient to arrange
the counter as shewn in Fig 4, with its glass face I presented at an angle of 45°, so
that the dial may be more conveniently read. In this case, the pawl g which
works the ratchet wheel H of the counter is arranged, as shewn in elevation at
Fig 5, with a tail h so as to butt against a stationary stop causing the pawl to
engage with the ratchet, with certainty taking one tooth, as the slide rod which
carries the pawl completes its upstroke. For the purpose of testing tightness, one
of the slides T¹ may be shifted, or the facing on which it works, as indicated in
Fig 6 can be shifted by a screw or otherwise worked from outside the apparatus.
Although I have described generally the water meter having two cylinders with
their pistons alternating, it is to be understood that no general claim is made to
such an arrangement of meter.
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 water meter herein described and shewn by the drawings.
2. In combination with the two cylinders and slides, the middle piece J with its
opposite facings, ports and passages.
3. The herein described arrangement of the pawl and ratchet for working the
counter.
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