AN IMPROVED ARRANGEMENT OF PORTS FOR ADMITTING STEAM TO AND EXHAUSTING IT FROM THE CYLINDERS OF STEAM ENGINES to be as follows
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, GEORGE THOMPSON DICKINSON of the City and County of Newcastle upon
Tyne Gentleman do hereby declare the nature of said Invention for "AN IMPROVED
ARRANGEMENT OF PORTS FOR ADMITTING STEAM TO AND EXHAUSTING IT FROM
THE CYLINDERS OF STEAM ENGINES to be as follows:-
נו
My Invention has for its object to provide means whereby the action of the
pistons of Steam Cylinders is much facilitated and their power more effectually
utilized than has hitherto been the case. According to my Invention I make the
exhaust and the Steam Ports leading from the Cylinder distinct from each other
and I make the exhaust ports of greater capacity than the inlet ports so that
a quick exhaust is obtained and the loss of power bitherto resulting from the small
area of escape hitherto provided for the exhaust where the same passages are used
for both steam and exhaust is obviated.

page_text: COMPLETE SPECIFICATION.
I GEORGE THOMPSON DICKINSON of the City and County of Newcastle upon
AN IMPROVED
Tyne Gentleman do hereby declare the nature of my invention for
ARRANGEMENT OF PORTS FOR ADMITTING STEAM TO AND EXHAUSTING IT FROM
THE CYLINDERS OF STEAM ENGINES," and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:—
My Invention has for its object to provide means whereby the action of the
pistons of Steam Cylinders is much facilitated and their power more effectually
utilized than has hitherto been the case.
According to my Invention I make the exhaust and the steam ports lead from
the Cylinder distinctly from each other and I make the exhaust ports of greater
capacity than the inlet ports so that a quick exhaust is obtained and the loss of
power hitherto resulting from the small area of escape hitherto provided for the
exhaust where the same passages are used for both steam and exhaust is obviated.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of Drawings the same letters of reference
indicating corresponding parts in all the figures.
Figures 1 and 2 represent in sections taken at right angles to each other a Steam
Cylinder constructed according to my Invention. Figure 3 is a plan with the
cover of the Steam chest removed shewing the exhaust ports, and Figure 4 is a
similar view of the reverse side shewing the inlet ports leading to the steam
cylinder. A is the steam supply pipe leading to the steam chest B from which the
inlet ports C lead to the steam cylinder. Dis the steam exhaust pipe opening
into the exhaust steam chest E into which the exhaust ports G open. The exhaust
ports G are as hereinbefore described of much larger area than those for the inlet
of Steam. The valve gear may be of any suitable kind (for example as shewn in
the Drawings) provided that it is arranged so that when the exhaust port on the
one side of the piston is open, the inlet port on the same side is closed and
vice versa.
•
Although I have shown my Invention as applied to a double acting cylinder it
will be readily understood that the same may be applied also to single acting
cylinders.
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
Providing the cylinders of Steam Engines with exhaust port or ports distinct
from the Steam inlet port or ports the said exhaust port or ports having a greater
capacity or larger area than the said inlet port or ports substantially as and for the
purpose herein before described.