Year: 1885

page_text: I, HERBERT JOHN ALLISON, of the firm of Allison Brothers, of 52 Chancery
Lane, London, in the County of Middlesex, Patent Agents, do hereby declare the
nature of this invention, which has been communicated to me from abroad by
Henry Martin Bartlett, of Somerville, and William Herbert Brown, of Cambridge,
both in the State of Massachusetts, United States of America, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
This invention has for its object to provide a simple accurate and easily operated
fluid meter, and it consists in the improvements which I will now proceed to
describe and claim.
Of the accompanying drawings forming a part of this specification, Fig. 1
represents a longitudinal vertical central section of a meter embodying my inven-
tion. Fig. 2 represents a top view of the piston reversing valve, and a portion of
the casing on which it moves. Fig. 3 represents a section on line x, x, Fig. 2.
Fig. 4 represents an end elevation of the meter with one of the ends or head
removed. Fig. 5 represents a section on line y, y, Fig. 4, looking upwardly. Fig. 6
represents a section on line y¹, y¹, Fig. 4.
The same letters of reference indicate the same parts in all the figures.
In the drawings:--
a represents the casing having the central receiving or induction chamber 2 and
the cylindrical or piston chamber 3, 4, in which the connected pistons b, b¹,
work. Below the ends 3, 4, are valve seats c, c², having ports d, d, one of which d,
communicates through passages e, e, with the piston chamber 3, while the other d¹,
communicates through passages el, el, with the piston chamber 4.
f represents the semi-cylindrical valve, which reciprocates in the casing below
the valve seats c, c¹, and has two ports g, g¹, near its opposite ends and two
ports h, between the ports g, g. Between the ports g, h, and the ports g¹,
the valve is cut away forming a large central opening o', enclosed by walls 2, 2, 2, 2,
Fig. 2. Into this opening extends a projection p², affixed to the bottom of the

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casing and having a flat upper surface constituting a valve seat, in which are three
ports, and p. The port communicates through a passage m with one end of
the lower portion of the casing a, while the port communicates through a
passage m' with the opposite end of the casing. The port p communicates through
a passage pl with the eduction or outlet passage p³. In the bottom of the casing
are two ports q, q', at opposite sides of the projection p³, said ports communicating
with the outlet passage p³. The port q is alternately connected with the outlet
port and covered by the bottom of the valve, while the port q¹ is alternately
connected with the outlet port h³, and covered by the bottom of the valve.
represents a D valve which slides on the upper surface of the projection and
alternately connects the ports and with the outlet port p, the port other than
the one thus connected with the outlet port, being uncovered and connected with
the induction chamber 2.
The valve is reciprocated by the pistons b, b¹, each striking the valve in turn
when it nearly reaches the inner end of the stroke.
OPERATION.
The ports being in the position shown in Fig. 1, the port g² coinciding with the
port and the port d with the outlet port.¹ water passes from the induction
chamber into the large central opening o¹ between the ends of the valve f and from
thence through the passages v, v, in the valve to the port g¹ and through the latter,
the port and passages e¹, e¹, into the chamber 4 of the casing, pressing against
the piston band forcing both pistons in the direction indicated by the arrow in
Fig. 1. The piston bis thus caused to force the water from the chamber 3 of the
casing through the passages e, e, port d, the outlet port of the valve and the
outlet port q of the casing. When the pistons nearly reach the end of their stroke
in the direction indicated, the piston b¹ strikes the valve r, and moves it until it
connects the ports and p, and uncovers the port . Water is thus admitted to
the casing at the left hand end of the valve through the port and passage m¹,
and is permitted to escape from the opposite end of the casing through the
passage m, port L, valve r and port p to the outlet passage. The water thus
admitted to the left hand end of the casing forces the valve f to the right thus
connecting the outlet port h¹ of the valve with the port d₁ of the casing and
the inlet port g of the valve with the port d of the casing. The entering water
now passes from the induction chamber, to the piston chamber 3 and reverses
the movement of the pistons, causing the piston 6' to expel the water from the
end 4. When the piston breaches the valve 7, it moves it back to the position
shown in Fig. 1, causing it to connect the ports p and land uncover the port l.
Water now enters the right hand end of the casing through the port and
passage m, and moves the valve so as to again admit water to the chamber 4 and
reverse the movement of the piston.
The ends of the casing are provided with yielding buffers for the pistons and for
the valve f.
An opening a³ is provided in the upper portion of the casing through which
passes that portion of the indicating mechanism which is acted on by the pistons
to indicate the quantity of water. Any of the well known forms of indicating
mechanism adapted to be operated by the reciprocating pistons may be employed,
and as I have not devised anything novel in said mechanism, I have not thought it
necessary to illustrate it in the drawing.
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
•
1st The combination of the piston reversing valve having the large central
opening and the inlet and outlet ports arranged in pairs at opposite sides of said
opening, the casing having the induction and piston chambers, the fixed projection

page_text: and its ports located in the central opening of the valve, and ports arranged
substantially as described whereby water may be conducted to either piston
chamber from the inlet and from the other piston chamber to the outlet, the D valve
arranged on the fixed projection, and the pistons arranged to reciprocate said valve,
as set forth.
2nd The combination of the casing having the induction chamber and piston
chambers, the ports d, d', communicating with the outer ends of the piston
chambers, the eduction ports q, q', in the lower portion of the casing, the fixed
projection having the ports 1, communicating with the ends of the casing and
the port p, communicating with the outlet, the D valve resting on said projection,
the connected pistons arranged to reciprocate said valve, and the piston reversing
valve, having a central opening for the projection p' and the ports g, h, g, h, at
opposite sides of said central opening, as set forth.
Dated this 20th day of December 1885