Improvements in Air Pumps.
Year: 1889

page_text: Date of Application, 14th May, 1889
Complete Specification Left, 10th Feb., 1890-Accepted, 15th Mar,, 1890
PROVISIONAL SPECIFICATION.
Improvements in Air Pumps.
1, HARRY WILLIAM NEILD, of Shoe Lane, in the City of London, Enginoer, do
hereby declare the nature of this invention to be as follows:-
-
The object of this invention is to construct an efficient air pump in a simple and
inexpensive manner.
I form the apparatus of two vertical cylinders closed at the bottom and set side by
side. Each cylinder is cast with a short branch pipe projecting sidewise from it close.
to the bottom-these two branch pipes are secured to one another by flanges on their
ends bolted together. Within the two horizontal branch tubes is held a cylindrical
bearing through which a horizontal plunger is made to work to and fro-the plunger.
rod is carried out through a stuffing box formed in the centre of a cover plate which
covers the end of a short branch pipe that extends from the side of one of the cylinders.
The upper part of each cylinder is of somewhat larger diameter than the lower part.
Each upper part has a short branch pipe projecting from it-the ends of these meet
and they are bolted together. Upon the shoulder, where the larger diameter of each
cylinder meets the smaller one, is carried a delivery valve-it is formed of a perforated
disc which rests on the shoulder and has a flexible ring above it covering the
perforations.
+
A branch of the suction pipe is carriod down through the centre of the disc and at
its lower end carries a suction or inlet valve. The end of the branch pipes and the
suction valves which they carry are always below the surface of liquid contained in.
the lower parts of the two cylinders. The upper part of each cylinder also contains
liquid which covers the delivery valves.
By constructing a pump in the above way all the parts are of a cylindrical or
circular form and can be constructed and fitted together at small cost.
Dated this 13th day of May 1980
HARRY W. NEILD.
COMPLETE SPECIFICATION.
Improvements in Air Pumps.
1, HARRY WILLIAM NEILD of Shoe Lane in the City of London 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 :-
The object of this Invention is to construct an efficient air pump in a simple and
inexpensive manner.
I form the apparatus of two vertical cylinders closed at the bottom and set side
by side. Each cylinder is cast with a short branch pipe projecting sidewise from it
close to the bottom-these two branch pipes are secured to one another by flanges
on their ends bolted together. Within the two horizontal branch tubes is held a
cylindrical bearing through which a horizontal plunger is made to work to and fro, the
plunger rod is carried out through a stuffing box formed in the centre of a cover
plate which covers the end of a short branch pipe that extends from the side of one
of the cylinders. The upper part of each cylinder is of somewhat larger diameter
than the lower part. Each upper part has a short branch pipe projecting from it-the
ends of these meet and they are bolted together. Upon the shoulder where the
larger diameter of each cylinder meets the smaller one, is carried a delivery valve-
it is formed of a perforated disc which rests on the shoulder and has a flexible ring
above it covering the perforations.

page_text: A branch of the suction pipe is carried down through the centre of the disc and
at its lower end carries a suction or inlet valve. The end of the branch pipes and
the suction valves which they carry are always below the surface of liquid contained
in the lower parts of the two cylinders. The upper part of each cylinder also contains
liquid which covers the delivery valves.
By constructing a pump in the above way all the parts are of a cylindrical or
circular form and can be constructed and fitted together at small cost.
In order that my said Invention may be fully understood and readily carried into
effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan and Figure 2 is a vertical section of an air pump constructed
in accordance with my Invention.
a a are two cylinders. a¹ a¹ are branches by which they are connected at their
lower ends and these branches also form a channel in which a plunger works. Above
the cylinders a and formed with them are cylinders of larger diameter a² a² and
these cylinders also are connected by branches a³ a³. In the channel formed by
the branches a¹ the plunger works; it is attached to a rod and a connecting
rod couples the plunger rod with a crank upon an axis d which is driven in any
convenient manner.
a* is a bearing in the channel formed by the branches a¹ it serves to guide the
plunger and also to form a liquid tight partition between the cylinders. ee are
gratings resting on ledges at the top of the cylinders a and secured by bolts.
are annular sheets of vulcanised india rubber, serving as valves; they rest on the
gratings e and are retained between these gratings and the guards gg. The guards
are formed with or fixed to the suction pipes which at their lower ends are fitted
with valves. The valves on the suction pipes cach consist of a grating ' and
guard and an india rubber disc held between the grating and the guard. i is
an outlet by which any water entering by the suction pipes passes away. j is a
small pipe which supplies water to the gland through which the plunger rod works.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The combination substantially as described in an air pump, of the cylinders a a;
the passage connecting the cylinders at their lower ends; the plunger working
through a bearing in this passage; the gratings at the upper ends of the cylinders;
the annular sheet resting on the gratings and serving as valves and the suction pipes
furnished with valves and passing down through the gratings.
2. An air pump substantially as described and illustrated by the annexed drawings.
Dated this 20th dose of January 1890
HARRY W. NEILD.