Improvements in Pumps.
Year: 1892

page_text: Date of Application, 7th June, 1892-Accepted, 23rd July, 1892
1
Improvements in Pumps.
I, BENJAMIN JOSEPH BARNARD MILLS of 23 Southampton Buildings in the.
County of Middlesex, Patent Agent, do hereby declare the nature of, this inven-
tion a communication to me from Henry Jandin of 28 Cours Morand, Lyons, in
the Republic of France, Engineer, and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying drawings and to the figures
and letters marked thereon :-
The invention consists of an arrangement of two piston pump producing in the
suction and delivery pipes, a so-called continuous current, that is to say a practically
uniform delivery.
Figure 1 represents a sectional elevation of a pump constructed according to
the invention and
Figure 2 is a diagram representing the arrangement of the cranks and their
connections to the pistons.
It consists of two parallel cylinders B. B', in which move pistons P. P' which
receive motion from two cranks M. M' keyed upon the same shaft.
The suction tube A' is divided into two branches 'A A' communicating with
the chambers K. K' which unite the ends of the two cylinders.
The delivery pipe is also divided into two branches R. R' connected to and
starting from the same chambers K K' and uniting in a single tube R'.
The chambers K. K' are each furnished with three valves opening in the direction
of the current, the intermediate valves c. c¹ separate the two cylinders from each
other and the extreme valves a. a¹ r. r¹ separate each cylinder from the suction and
delivery tubes.
Each of the pistons P and P¹ can also draw in through the suction tube A³ and
deliver into the delivery tube R' and according as they travel in the same or in
different directions, it is the sum or the difference of the volumes which they create
which determines the delivery.
The pistons are of such dimensions and stroke that the volumes created by each
of their faces shall be equal, and they are driven by cranks forming an angle of
120°, that is to say a third of the circumference of their motion.
In these conditions, it has been found by calculation, that the volume raised is
the same for each dozen turns of the motive shaft, and that in each of these turns
the delivery varies by so small a quantity that the practical result is a uniform.
delivery. This condition being realized enables air chambers in the delivery to
be dispensed with.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. An arrangement of uniform current pump formed of two pistons P and P.
acting within two cylinders B and B' which are connected at their ends by
chambers K K₁ each furnished with three valves opening in the direction of the
current, and separating the. two cylinders from each other and each of them from
the suction and delivery tubes, the two pistons creating by each of their faces
equal volumes and being driven by cranks forming an angle of 120° substantially
as herein shown and described.

page_text: 2. The novel combination and arrangement of parts forming a uniform current
pump substantially as herein shown and described.
Dated June 7th 1892.
B. J. B. MILLS,
'
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.