Year: 1899

page_text: I, WALTER GEORGE KENT, of 199, High Holborn, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention to be as follows:-
-
This invention relates to water meters having a cylinder to which liquid is
admitted and withdrawn by means of a slide valve and particularly to my
Absolute meter described in the Specification No. 21793 of 1891.
"
In such meters if there is a very small flow it sometimes happens that the
piston or pistons and therefore the valve or valves do not perform their full
stroke, the result being that the fluid passage through the valve is unduly con-
tracted.
According to this invention a spring or its equivalent, such as, a tumbling
weight, a double inclined plane, or the like, is provided tending to move the
valve to its extreme positions immediately it has passed its central position and
preferably the spring which keeps the valve against its seat is employed for this
purpose.
This may be done by pivotting to the back of the valve a short lever or rocker
whose other end is pivotted to the ends of a bow spring. The valve moves towards
its central position against the spring which is bent outwards until the rocker
is at right angles to the valve but immediately this point is passed the tendency
of the spring is to force the valve onwards.
Dated this 30th day of Vovol 1800
I. WALTER GEORGE KENT, of 199, High Holborn, in the County of Middlesex,
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 :-
This invention relates to water meters having a cylinder to which liquid is
admitted and withdrawn by means of a slide valve and particularly to my
"Absolute" meter described in the Specification No. 21793 of 1891.
In such meters if there is a very small flow it sometimes happens that the
piston or pistons and therefore the valve or valves do not perform their full
stroke, the result being that the fluid passage through the valve is unduly con-
tracted.
According to this invention a spring or its equivalent, such as a tumbling
weight, a double inclined plane, or the like, is provided tending to move the
Di Q77

page_text: valve to its extreme positions immediately it has passed its central position and
preferably the spring which keeps the valve against its seat is employed for this
purpose.
This may be done by pivotting to the back of the valve a short lever or rocker
whose other end is pivotied to the end of a bow spring. The valve moves towards
its central position against the spring which is bent outwards until the rocker
is at right angles to the valve but immediately this point is passed the tendency
of the spring is to force the valve onwards.
Preferably however I adopt the arrangement shown in the drawings in which
Figure 1 is a side elevation partly in section, Figure 2 is a back elevation and
Figure 3 a plan of part of a meter having its slide valve constructed according
to this invention.
d is a
a is the slide valve working on the face b in which are the ports c.
slotted tube on the top of the meter cylinder (which is not shown) and forming a
guide for the block e on the top of the piston rod f. is a slide having flanges g
at the top and bottom which project through one of the slots in the tube d and
is
engaging with the block.e at the end of each stroke of the piston. The slide
notched at the middle to receive the back of the slide valve a so that the latter
moves with it. When the parts are in the position shown in the drawings the
piston has almost completed its downward stroke and the block e has just come
into contact with the lower flange g' and in its further movement will carry the
slide g and valve a downwards with it. hh are rollers bearing on the back of the slide
valve a and carried by springs ' fixed to the top of the tube d. aa¹are inclines
on the back of the valve a. When the valve a is moved downwards as above
described the rollers are forced to ride up the inclines a' and then when they pass
the top their pressure on the other faces of the inclines propels the valve a down-
wards irrespective of whether or not the piston and block e complete their down-
ward stroke.
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
1 claim is:-
1. The combination with the slide valve of a liquid meter of a spring or its
equivalent tending to move the valve to its extreme positions immediately it bas
passed its central position substantially as described.
2. The method of actuating the slide valves of liquid meters substantially as
described and illustrated in the drawings.
Dated this 22nd day of December 1899.