Improvements in and connected with Steam Engines.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Steam Engines.
JOHN HOLLOWAY Maybury House Beckford Road West Cowes, Isle of Wight
Mechanical 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 compound, triple, or quadruple steam engines. The
accompanying drawings show its application to compound engines.
Figure 1 (on Sheet 1 of drawings) is a section on C D of Figure 2, Figure 2
being outside elevation of cylinders and steam chest complete.
Figure 3 Sheet 2 is a section on A B of Figure 1 with valves removed, and
Figure 4 a section through cylinders on E F of Figure 2.
Figure
shows arrangement of cylinders valve chambers and valves, H being
high pressure cylinder, and L low pressure cylinder, G high pressure valve and
valve chamber, I low pressure valve and chamber.
As shown by drawing, the high pressure cylinder is placed inside the low
pressure cylinder, a piston works in this cylinder being connected to crank by
piston rod and connecting rod in the usual way, the piston which works in low
pressure cylinder L. is connected to crank by two piston and connecting rods, one
on either side of high pressure cylinder H, as shown by J and K in Figure 4.
Steam is supplied to cylinders H and L from steam chest A B. This steam
chest is also used as cylinder covers.
Steam enters steam chest at A, passes through high pressure valve chamber G,
through ports M and N to high pressure cylinder H, back through ports M_N and
valve chamber G to low pressure valve chamber I and through ports O P on to
low pressure cylinder L, back through ports O P and valve chamber I and
exhausts through B.
Thus steam enters A passes through cylinders H L and is exhausted at B.
The valves G and I are actuated by moving parts below the cylinder in the
usual way.
The valves G I Fig. (1) Sheet (1) are of a section shown by drawing, and of
such a length to cover ports M N O P of Fig. (3) Sheet (2), they have a circular
motion, and are actuated by a rod passing through each of them, by this rod the
valves are turned round sufficiently to open ports M O Fig. (1) Sheet (1) to steam.
While ports M. O. are admitting steam to cylinders, the ports N P are exhausting
steam, the exhaust steam passing through the valves G. I. The exhaust steam
which is passed through (G), goes through (1) to low pressure cylinder L Fig. (1)
Sheet (1), and that which passes through (1) to atmosphere or condenser. The
valves are then moved back, opening N P to live steam and MO to exhaust steam,
this action being repeated at each stroke of the engine.
In regard to triple and quadruple engines, the same principle is acted upon as in
compound engines. The cylinders being placed inside each other, and steam
distributed to each cylinder by means of steam chest and valves, of the same
construction as used for compound engines having one valve for each cylinder.
The pistons working in each cylinder, are connected to piston rods, the piston rods
being connected to crank shaft, by means of crossheads and connecting rods, in the
usual way.

page_text: 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.
1. The placing of one cylinder inside another.
2. The manner in which steam is distributed through the cylinders by steam
chest.
Dated this 10th day of September 1804
JOHN HOLLOWAY.