Year: 1887

page_text: Date of Application, 24th Feb., 1887.
Specification Accepted, 25th Mar., 1887.
I, HENRY DAVEY, of Headingley, Leeds, in the County of York, 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 an improved method by which Pumping Engines are made
to work expansively without the use of a fly-wheel. The mechanism which I employ
may be variously modified to suit the particular kinds of engines to which it is applied.
Figs. 1 and 2, show its application to a Compound Direct-acting Engine made to
actuate two Single-acting Plunger Pumps. Fig. 3 shows its application to a pair of
Bucket Pumps and Figs. 4 and 5 its application to a pair of Deep-Well Pumps. The
same letters of reference indicate corresponding parts in the various figures.
In Figs. 1 and 2, b and c are the steam pistons; m and m³ the piston rods connected
directly to the pump plungers d and . The pistons and may be those of a
Compound Engine or those of two Single Engines. The piston rods m and m¹ are
coupled together by means of the connecting rods and the bent lever a
which turns on the fixed fulcrum n. The effect of thus coupling the piston rods to the
bent lever a, is to cause the pistons to move in opposite directions but at relatively
varying velocities. When one of the plungers is making its forward or forcing stroke,
the other is making its backward or suction stroke. The steam piston attached to the
plunger making its suction stroke will be helping the piston of the plunger making its
forcing stroke with an increasing effect, that is to say, at the beginning of the stroke
it will have very little leverage on the forcing plunger, but that leverage will increase
until at the end of the stroke it will have arrived at a maximum. As the resistance
to the forcing plunger is practically constant, and the leverage brought to bear on it
by the piston is made to vary, a varying pressure may be employed on the surface of
the piston.
e and el are combined valve boxes and air vessels of the two plunger
pumps. When the bent lever a, is employed to couple together two bucket or single-
acting piston pumps, and the resistance of the pump is opposite in direction to that of
the plunger pump, then the bent lever a is reversed as shown in Fig. 3, where m and
m² are the piston-rods; g and g¹ the pistons or buckets of the pump. Figs. 4 and 5

page_text: show the application of the hent lever to well pumps. The bent levers a and a Fig. 4
turn on the fixed fulcrums and n', and are connected together by means of the
connecting rod, and are connected to any suitable direct acting engine by means of
the rod . The rods and serve to connect the bent levers a and a to the pumps.
The bent levers a and a move through the ares indicated by the dotted lines, one
pump rod making the down stroke whilst the other is coming upward. It is quite
evident that it is possible to combine the two bent levers a and a¹ in one, placing the
arms for working the pumps in the positions shown in Fig. 5 where k is the connecting
rod from the bent lever to the engine, and and the connecting rods to the pumps.
Having now described the nature of my invention, and in what manner the same has
to be performed, I claim,
1. The use of a bent lever for coupling together direct-acting pumping engines and
pumps, substantially as described and illustrated in Figs. 1, 2, 3, 4, and 5.
2. The arrangement of parts of a pumping engine, substantially as illustrated in
Figs. 1, 2, and 3.