Improvements in Pumps.
Year: 1896

page_text: Date of Application, 13th Mar., 1896
Complete Specification Left, 12th Dec., 1896-Accepted, 6th Mar., 1897
UNAL
Improvements in Pumps.
We ADAM PURVIS and WILLIAM PURVIS both of Preston Street, Glasgow,
Scotland, Engineers do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to simplify the valves of pumps and make
them more accessible and easily renewed than heretofore; and provide means
whereby the plunger or piston rod guides can be adjusted for wear.
The valve case has the inlet formed in its bottom or side, on or round which
may be placed a leather or other suitable washer, on which is placed a metallic
ring or seat for the valve which consists of a leather or other suitable flap placed
thereon, and held in its place by a retaining open metal cap or frame fastened
down by a bolt or stud projecting from the case cover; the whole being easily
got at and separated.
The guides or their supports are constructed so that their joints are at right
angles to the rod, and have slotted or oblong bolt holes which allows them to
be adjusted as desired.
Dated this 12th day of March 1806
D. F. MASON, C.E.,
Glasgow, Patent Agent.
We, ADAM PURVIS and WILLIAM PURVIS, both of Preston Street, Glasgow,
Scotland, Engineers, 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 :-
Our said invention has for its objects to simplify the valves of pumps and make
them more accessible and easily renewed than heretofore; and provide means
whereby the plunger or piston-rod guides can be adjusted for wear.
And in order that our invention may be properly understood we have appended
the accompanying sheet of drawings whereon Fig. 1 is a vertical sectional elevation
of a pump having our improvements therein, and Fig. 2 is a sectional plan thereof
on the lines -y.
Fig. 3 is a sectional plan of a guide frame on the line z Fig. 1. According to
our invention the valve cases b, b¹ have each above their inlet d a flange c formed
round their inner periphery on which is placed a leather or other suitable jointing
washer e to form a water tight joint between it and a larger metallic washer n
which constitutes the seat of the valve. The seat n may be a plain unfinished
casting or washer merely roughly filed over to fit thus, water tight between two
flexible jointing washers. As shewn in case 6 the valve consists of a disc of

page_text: leather or other suitable flexible material having a circular cut therein as shewn
in Fig. 2, so that its outer annular part o forms the top jointing washer and its
inner tongue o¹ constituting the valve on top or back of which is fixed a stiffening
metal plate s.
The outer edge o of valve is held watertight in its place on the seat n by a
ring u having arched ribs u formed so as to make a retaining open metal crown
cap u, u¹ which is fastened down from top by a screwed stud v projecting through
case cover. In lieu of a flexible valve o; as shewn in case 6' there may be placed
on seat n a flexible washer 5 on which is placed an ordinary valve whose stem t
would be guided as shewn in top of cap u; the bottom of valve being guided by
ordinary guide ribs thereon (not shewn). Or instead of last said valve ta
spherical ball valve as indicated by dotted circle t¹ may be used, the depending
stem t guide part of cap u being dispensed with (as shewn in case ) to allow
ball t to rise within cap. The inlet and discharge ports d & 21 are respectively
located below and above their respective valves. By removing the covers with
studs, the caps u, valves o, and seats n can be easily removed and replaced or
renewed when desired without disturbing pipe or other joints.
In pumps, the plungers or rods 23 of which are guided by rollers 24 revolving in
frames 25, we construct the said frames 25 so that their joints are at right angles
to the travel of the rod 23 and form the foot of frames 25 with oblong bolt holes or
slots 26 as shown in plan Fig. 3. Through the flanges 27 of pump barrel and
slots 26 of frames are passed bolts fastened by nuts as shown in Fig. 1. Obviously,
the bolt holes in flange 27 may be formed oblong same as shown in plan Fig. 3.
instead of holes 26, so that the frames 25 may be adjustable towards rod 23 for
wear as desired.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
.claim is
1. The construction, arrangement and combination of pump valves as and for the
purposes specified and shewn.
2. The construction, arrangement, and mode of adjusting the guide frames of
pumps as and for the purpose specified and shewn.
Dated this 11th day of December 1896.
DAVID F. MASON,
Glasgow, Patent Agent.