Year: 1888

page_text: Date of Application, 5th Jan., 1888
Complete Specification Left, 27th Sept., 1888
Complete Specification Accepted, 2nd Nov., 1888
I CHARLES EDWARD HALL of Meersbrook Bank, Sheffield, in the county of
York, Engineer do hereby declare the nature of this invention to be as follows:-
;
Firstly in an improved combination of circular valve or piston and sleeve.
Secondly; in means of automatically operating the same.
Thirdly in improved means of reversing Engines constructed according to my
Invention.
Fourthly applications of the said Improvements to High Speed and other
Engines.
In the generality of High Speed Engines, the steam is admitted throughout the
length of the stroke or at fixed portions thereof, and according to one of my
Improvements, the steam is cut off automatically by the Governor at any point of the
stroke in proportion to the power required perform the work.
My Invention consists in the first place of making a pipe, tube or sleeve having
ports or openings in its surface corresponding with those in the main Slide Valve
(which is of the piston type) and the valve chest which is circular by preference but
which may also be square on the inside. The said tube or sleeve which, I call the
expansion valve is actuated by the Governor automatically. This expansion Valve, I
also, claim when actuated by Eccentrics, cams, Levers or any other mechanical
equivalent when it is desired to work the Engine with a fixed or variable cut-off
according to the first and second parts of my Invention.
The third part of my Invention relates to improved means of reversing High.
Speed and other Engines and consists of a small steam valve-chest; in the former of
which is a valve of the D or piston type, working over ports arranged in such manner
that the steam can be let into either of the two passages, so that by means of changing
the position of the D valve the steam is admitted either into the centre or at the ends
of the main slide valve and by that means reversing the Engine.
The reversing valve may be actuated by means of levers, hand-wheels and screws
similar equivalents

page_text: The fourth part of my said Invention relates to the application of the foregoing
Improvements to High-pressure, Low-pressure, Single, double or multiple cylinder
compound Engines High or slow speed, whether worked by steam, air, gas, water or
other liquid or fluid.
In carrying out my Invention under the first part, I construct an Engine having
one or more cylinders arranged radially around a central axis or crank-shaft, or placed
vertically side by side over a crankshaft secured in hearings. upon a hedplate and
enclosed in a suitable casing after the well-known manner of constructing High Speed
single acting Engines.
The valve chest with its steam-admission ports is machined out and a sleeve or tube
of the same outer section is constructed to fit truly therein having slits or ports
corresponding with the steam ports in the cylinders. This sleeve is bored truly and
a piston-valve is placed therein having suitable steam and exhaust ports to correspond
with those in the said tube or sleeve. This main piston valve is operated by an
eccentric and rod in a well-known manner.
A High Speed and Sensitive Governor of any suitable kind and driven by belt or
positive gearing controls the speed of the said Engine by operating directly upon the
sleeve or tube encircling the main valve when it is desired to automatically vary the
cut-off according to the work being performed which is most desirable in High Speed
Engines for electric Light work where any variation of speed seriously affects the
success of the illumination. The construction of this valve according to my Invention
renders it most efficient as an instantaneous cut-off for the steam and speed controller
when coupled direct to a good Governor.
When it is desired to reverse such Engines as described by me instantaneously, I
effect this by constructing two or more ports in the steam chest opening respectively
to the outer ends of the main piston valve or admitting steam into the centre of the
same in which case the direction of the said valve is changed. To effect this a valve
chest is cast or secured to the main valve chest (which has two or more ports on its
outer face) and this auxiliary valve chest has three ports on its face; two for
admission of steam and the middle one for the exhaust; a D or piston valve is
arranged to work upon the said valve face and according as the top or bottom
admission port is open the main valve admits steam to its outer ends or to the
middle whereby the direction of the rotation of the crank-shaft is reversed.
In applying my said Improvements to the usual type of Engines where it is
desired to have a fixed cut-off, the Governor is used only in controlling the speed of
the Engine by regulating the supply of steam to the valve chest whilst the cut-off
valve tube or sleeve is operated upon mechanically by eccentrics, cams, levers or other
equivalents from the crank-shaft in any well-known manner and set to give the
desired cut-off, or the said valve may be set from the outside by a screw and wheel to
give a fixed admission of steam during a given part of the stroke when the work is
sufficiently regular to admit of this.
These Improvements or some of them may be applied to fixed Engines of either
vertical or horizontal types also to Traction, Portable and Marine Engines for any
purposes with beneficial results.
In witness whereof I have put my hand this Fourth day of January 1888.

page_text: CHARLES EDWARD HALL, of the Standard Iron Works, Sheffield, 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:-
Firstly-In an improved combination of circular Valve or piston and sleeve.
Secondly in automatically operating the said Sleeve or expansion Valve.
Thirdly in improved means of reversing Engines.
Fourthly-in applications of my said improvements to High Speed and other
Engines.
In the generality of High Speed Engines the stean is admitted throughout the
length of the stroke or at fixed portions thereof, whilst according to one of my im-
provements the steam is cut off automatically by the Governor at any part of the
stroke in proportion to the power required to perform the work.
My invention consists in the first place of making a pipe, tube or sleeve having
ports or openings in its surface corresponding with those in the main slide valve (which
is of the piston type) and the valve chest which is circular by preference but which
may also be square or otherwise upon the outside, the said tubo or sleeve which I call
the expansion valve is actuated by the Governor automatically.
The expansion valve may also be actuated by an eccentric or cam and levers or
other mechanical equivalent when it is desired to work the Engine with any fixed or
variable cut-off according to the first and second parts of my invention.
Engines constructed according to my invention may have double or single cylinders
and may be arranged as compound Engines according to the work required of them.
The third part of my invention relates to improved means for reversing High Speed
and other Engines, and consists of a small steam valve chest secured to, or cast in one
with main valve chest. In the former case, an ordinary D valve (working over ports
arranged in such a manner that the steam can be let into either of the two passages)
communicates with the main slide valve so that by means of changing the position of
the D valve, the steam is admitted into either of the said passages; the central one
always remaining the exhaust port and by this means causing the Engine to reverse,
whilst by placing the D valve to cover both steam ports, the Engine will be stopped.
The reversing and starting valve may be actuated by levers, hand-wheel and screw
or similar equivalents.
The fourth part of my invention relates to the application of all or any of the fore-
going improvements to High pressure, Low pressure, single, double or multiple
cylinder Engines, whether worked by steam, air, gas, water or other liquid or fluid.
In order to more fully explain my said invention, I have added five sheets of
Drawings hereto.
Fig. 1. Sheet 1. is a vertical longitudinal section of a High Speed Single acting
Engine with two cylinders.

page_text: Modifications of this may be made to shorten each of the steam passages H H in
order to save steam; these will readily suggest themselves in designing the said
cylinder without departing from the nature of my invention.
Fig. 6, Sheet 4, shows an elevation of a horizontal Engine with my improved valves
operated by two eccentrics:-one for the main piston valve and one for the expansion
sleeves. This is moved by a vertical lever Q, attached to a bracket R, on each cover
and the travel of this valve is fixed by the stroke of the eccentric.
Figs. 7 and 8, Sheet 5, show the method of starting and reversing Engines constructed
according to my invention.
W, is the admission of live steam.
V, is the starting and reversing valve and is placed in the steam chest with a cover.
This valve is made to cover the two steam ports H H with sufficient lap at each end
to prevent admission of steam to either port when in its centre position so as to stop
the Engine. When it is desired to rotate the Engine forward or backward, the
valve Vis moved to uncover the bottom or top port H, which alternately puts the
forward and the backward steam port and the exhaust port into communication with
the exhaust pipe X cast to the side of the starting valve chest and so reverses the
Engine.
Having now fully described my Invention and in what manner the same is to be
performed :-
I claim :-
-
Firstly: an improved combination of circular slide or piston valve and sleeve sub-
stantially as described.
Secondly means of operating automatically or otherwise the same.
Thirdly an improved starting and reversing valve in combination with my improve-
ments.
Fourthly applications of these improvements to steam and Auid Engines of various
descriptions.
descriptions.
0 Witness,
O. SPENCER,
94, St. Mary's Road,
Sheffield.
CHAS. E. HALL.