Improvements in Compound Steam Engines.
Year: 1890

page_text: Date of Application, 18th Jan., 1890
Complete Specification Left, 18th Nov., 1890-Accepted, 3rd Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Compound Steam Engines.
I EDWIN CHARLES URRY of 147 Liverpool Road Islington in the County of
Middlesex Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to compound steam engines the object thereof being to
reduce the number of parts in engines of this description and so simplify the con-
struction at the same time using the steam in a more economical manner than
heretofore.
My improvements are applicable to both triple and double expansion and consist
in either case in dispensing with one of the cylinders heretofore used. Thus, in a triple
expansion engine I use high and low pressure cylinders the high pressure cylinder
being single acting and the low pressure double acting.
The area of the low pressure piston and capacity of cylinder are reduced on one side
by means of a hollow trunk which is attached to the piston and works in a stuffing
box on the cylinder cover. The steam after leaving the high pressure cylinder is
admitted to the contracted side of the low pressure the piston area of which is larger
than that of the high pressure and lastly, it is allowed to attain its full effective
expansion in the uncontracted end of the low pressure cylinder after which it may be
allowed to pass off entirely to the condenser or atmosphere.
Dated this 17th day of January 1890.
EDWIN C. URRY.
COMPLETE SPECIFICATION.
Improvements in Compound Steam Engines.
I, EDWIN CHARLES URRY, of 232 Goswell Road, 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 :—
This invention relates to compound steam engines, the object thereof being to
reduce the number of parts in engines of this description, so simplifying the con-
struction thereof; at the same time using the steam in a more economical manner
than heretofore.
In order that my invention may be the better understood, I have appended the
accompanying diagram, representing the general arrangement of a triple expansive
engine.
A is a single acting high pressure engine, and B a double acting cylinder in which
one side a of the piston is caused to act as an intermediate effect, and the other b
thereof as a low pressure cylinder, alternately open to the vacuum in the condenser
and steam pressure from the exhaust of a. The area of the low pressure piston, and
the capacity of the cylinder B is reduced upon the side a by means of a hollow trunk t,
which is attached to, or forms part of, said piston and passes through a stuffing box
in the front cover of the cylinder. The high and low pressure pistons are connected
by a rod.
Steam is admitted to the single acting high pressure cylinder from the pipe S by
the valve V, the other side of the piston being always open to the condenser by means
of pipe C. By the movement of the valve V when the piston has completed its
stroke, the exhaust from the acting side of A is admitted by means of a pipe E and
valve V' to the side a of the cylinder B, producing an intermediate expansive effect.
By the movement of the valves V₁ and V" the exhaust from a is admitted through the

page_text: orifices o o', which are joined. The return movement of V" allows the side of B to be
opened to the condenser through c and C, or to the atmosphere.
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:
The construction and arrangement of compound expansive engines substantially
as and for the purposes herein described, and shewn by the appended diagram.
Dated this 25th day of October 1800.
FREDK. WALKER,
11, Furnival Street, E.C., Agent for the Applicant.