Improved Pumping Engine.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improved Pumping Engine.
I, HENRY DAVEY, of 3 Princes' Street, Westminster, 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 :-
My invention consists of an improved form of pumping engine, in which the
steam engine is connected to the pumps by means of a rocking frame in an im-
proved manner; and in the combination with the engine and pumps a valve gear
for the distribution of steam, forming by the said combination an improved pumping
engine. Fig. 1 is an elevation of the said pumping engine; Fig. 2 is a plan of the
same; Fig. 3 a section through the steam cylinders and steam valves; Fig. 4 and 5
are sections of the gear for actuating the main valves, and Figs. 6 and 7 elevations of
the same gear. The same letters of reference are used for corresponding parts in the
various figures. A is a rocking frame connecting the engine and pumps. B is the
connecting rod to the engine, and C and D the connecting rods to the pumps E and F.
The dotted lines on the rocking frame A represents the arcs described by the said
connecting rods, which are above the centre for pumps lifting on the up stroke, but
below the centre for pumps forcing on the down stroke. G is a high pressure and H
a low pressure steam cylinder. I and are D slide valves with expansion
valves, i, i, i, i, working on them, a construction well understood by engineers. The
main valves II' are actuated either by water or steam pressure by means of the
subsidiary cylinder and piston a, Fig. 4. Steam or water is admitted by the slide
valve 6 to the subsidiary cylinder g, the piston of which actuates the slide valve h of
the cylinder a. The slide valve b is actuated by the engine through the rocking
shaft L by the rods and levers, m, n, o, p, r, s, or any other convenient system.
The piston a moves the main valves I and 1' through the rocking shaft K. The
expansion valves i, i, i, i are actuated from the rocking frame A through the rocking
shaft L and the connecting rods c and d. For the purpose of determining the stroke
of the steam piston M and economizing steam by compressing steam during the latter
end of the stroke into the clearance space, the cushioning valves e and fare provided.
The said valves are actuated by the engine through the rocking shaft L, and close
towards the end of the 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 I
claim is :-
1st. The combination of the rocking frame A with the pumps E and F and with the
engine substantially as described and illustrated.
2nd. The combination of the rocking frame A, the pumps E and F, and the engine
with the valve gear Figs. 4 and 5, the main valves i and I, the cut-off valves i, i, i, i,
and the cushioning valves e and f, substantially as described and illustrated.
3rd. The combination of the main valves I and I', the expansion valves, i, i, i, i,
the cushioning valves e and ƒ, and the valve gear Figs. 4 and 5, substantially as
described and illustrated.
Dated this 29th day of November 1889.
HENRY DAVEY.